Method and device for laser marking

FIELD: process engineering.

SUBSTANCE: invention relates to method and device for laser making of separate objects (versions) and may be used for making the eggs in sorting them and packing. There exists a definite tine interval during which marking can be applied on every egg as eggs are transferred in, at least, one path at preset speed. Proposed device comprises, at least, one first and second lasers located nearby one or several egg transfer paths to direct laser beam to eggs for making as said eggs pass through marking station. Said first and second lasers mark eggs next but one on their feed through marking station.

EFFECT: higher rate of making application.

41 cl, 15 dwg

 

BACKGROUND of INVENTION

The present invention relates to laser systems and, in particular, to a method and to a device for laser marking objects with high speed.

It is known that food and pharmaceutical products may deteriorate, and therefore they must be used no later than the date that is printed on these products or on their packaging, and marking the user can navigate, can I use the product, or it is already unusable. This is especially important for some food, which can become dangerous after expiration, in particular this applies to eggs, for which there is a risk of salmonellosis.

It is for this reason eggs are usually Packed in cardboard boxes, on which is printed the date of expiration of the eggs. In this case there is a problem with the fact that consumers often take the eggs out of cardboard boxes and place them in special holders refrigerators, resulting in lost important information about the shelf life of the product. Perhaps it is not widely spread, but there were cases when labels with printed expiration date was perceivables with some packages on the other to indicate a later expiration date, resulting in bacteria salmon is lly on eggs could develop into a dangerous state. Attempts were made to print directly on the eggs of information containing the storage period, for example, using inkjet printing devices, however, these overprints were short-lived and could be easily erased.

A promising solution drawing on eggs of information containing the expiry date and other relevant information, is the use of laser, which allows you to apply a reliable and durable marking that is difficult to remove. This marking is described in application US 11/333580, filed January 17, 2006, published under number US 2006/0138105 A1, entitled "Method and installation for applying for eggs of advertising copy, expiration date and identification code"that is specifically entered by reference into the present application.

Because only in the United States are produced annually billions of eggs, marking at least part of such a huge amount of eggs is a serious task. Most of the eggs produced in the U.S. only a few hundred companies. These enterprises are sorting machines, providing washing, checking freshness, sorting and packaging of large quantities of eggs. In modern high-performance sorting machines eggs are transported in several rows (two to six) to undergo various stages of processing, and PR is the capacity can reach 175,000 eggs/h

Since the marking of eggs must be running when performing this sort in the most economical manner, such labeling should be implemented very quickly, so that does not slow down the speed of the entire sorting machine. Thus, the operation of the marking should be performed during a short time interval and in a small space. In connection with the above time and space constraints, the number and complexity of inscriptions and symbols applied to eggs, are also limited, and laser marking device must be of such dimensions that it can be embedded into the sorting machine without interrupting her work.

BRIEF description of the INVENTION

The following describes embodiments of the present invention, which contain a device for laser marking individual objects on the marking station, and there is a certain interval of time during which each object can be marked as the objects are transported at least one path at a given speed, and the device comprises at least first and second lasers, which are located near one or more ways of transportation facilities and are intended for the direction of the laser beam on the object for drawing on them hereafter the values, as objects pass through the marking station, and the first and second lasers are marking objects in one, as the objects pass through the marking station.

Various embodiments of the invention also includes a method of laser marking individual objects when they pass at least one path through a marking station, preferably at the specified speed, and the method comprises: enabling the first laser to begin the process of marking the first object when it is included in the marking station, and continued marking of the object within the first defined time interval in the marking station; the inclusion of the second laser to begin the process of marking the next object when it is included in the marking station, and continued marking the next object during the second time interval specified in the marking station; and the first and second certain intervals overlap, so that both objects are marked simultaneously during at least part of the time intervals.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a view in plan of the eggs with symbols marked on it with a laser in accordance with the present invention and which contain the identification code, the expiration year of the spine, combined designation containing the word EGGFUSION, and text indicating new way of advertising;

figure 2 is a view in plan of the sorting machine containing device in accordance with the present invention, shown in two places along the length of the machine;

figure 3 is a view in plan of the preferred option laser marking device in accordance with the present invention;

figure 4 is a side view of the device shown in figure 3;

figure 5 is a end view of the device shown in figures 3 and 4;

figure 6 is a side view of parts of the device shown in figures 3-5, in particular the laser generator and elements for guiding the laser beam in the galvanometer head, providing the direction of the beam up to the marking of eggs;

figure 7 is a top view of part of the structure of the preferred option laser marking device in accordance with the present invention, similar to the design presented in figure 3, except that in the construction of figure 7 is used, the cover plate with holes which have lenses from Germany, which transmits the laser beams and the plate is designed to protect deploy galvanometer heads from falling on top of polluting material;

figure 8 is a perspective view of an alternative of the device, is provided on figures 3 and 4, in particular, the protective plate, inserted between the galvanometer heads and eggs, which are transported over the plate, together with the air knife, fall prevention material on the head;

figure 9 is a side view of the device shown in figures 3-5, in which part of the device shown in the space provided and tilted position;

figure 10 is a simplified view, which illustrates part of the sorting machine, transporting three eggs, along with two galvanometer head, and showing the sectors of laser beams;

figure 11 - image collapsed Donald Dhaka, which is composed of a set of vectors;

figure 12 is an image similar to the image shown in figure 11, but with a reduced number of vectors;

figure 13 is an enlarged view of the image shown in figure 11;

figure 14 is an enlarged view of the image shown in figure 12;

figure 15 is an enlarged and simplified view of the image shown in figure 14.

A DETAILED DESCRIPTION of the INVENTION

Embodiments of the present invention relate to a device and to a method of laser marking objects as they pass through the marking station, and the marking is done by lasers, which are arranged and installed the s for printing on objects in their passage through the station. Although the objects may have different sizes and shapes and can be made of different materials, but the most important objects, which primarily concerns the invention are chicken eggs.

It should be understood that the terms "label" or "engraving"used in the present description, are intended to indicate that the source of radiant energy is a laser. The laser beam is applied to a large part of the shell of the egg remained intact to provide contrast between the marking and the rest of the surface. The laser beam exposes ablation and melt the material of the outer surface of shell eggs. The big advantage of using laser marking is that the eggs with a dark shell out engraved signs and labels contrasting white color, while the eggs with white shells obtained engraved signs and labels contrasting dark brown. If it does not violate the integrity of the structure of the egg shell, because the engraving with a laser beam is carried out to a depth of only about 50 μm to about 90 μm, which is from about 5% to about 8% of the thickness of the shell.

From the huge number of eggs produced annually, most of them produced in large agricultural heartland is different enterprises with the number of laying hens, reaching hundreds of thousands that are more than one million eggs per year. These eggs are processed at the sorting machines, which are carried out washing, sorting, checking freshness and packaging of eggs, then Packed products are sent to customers. Sorting machines have very high performance and can handle up to 175 000 eggs per hour.

For such a production device and method for marking eggs must have high performance, ensuring the marking of eggs on the sorting machine without reducing the speed of its work. This is especially true for the case when it is necessary to put on each egg a large number of characters, such as graphic symbols. It may also be necessary to use multiple lasers, each egg must be performed several series of symbols, or eggs that are processed on the machine, transported in several rows. In addition, when the need arises run on each egg complex graphic symbols, such as, for example, intricate or large logo or pattern, you need to handle graphic images so that they could be played on the egg with enough visual clarity in terms of restrictions on time and space, existing at the passage of eggs through m is ciravegna station.

In the specific example presented in the figure 1, an egg 20 marked the top line 22 containing the text "A005 EXP 9/15" (identification code and the expiry date). The average line 24 contains a larger stylized representation of the word "EGGFUSION" with graphic elements, and the bottom row 26 contains the text "A fresh new way to advertise a new way of advertising"). Another larger graphic symbol shown in figures 11-14, represents the image of Donald duck, one of the characters of Disney cartoons, which will be described in more detail below in connection with the use of technology vector graphics.

Two marking devices, these symbols 30 and 32, shown in figure 2, in connection with the system containing the sorting machine 34. The sorting machine 34 is installed so that it is piped received eggs from production facilities, which are egg-laying hens, and in the car 34 checks the freshness of the eggs, they are washed, sorted, and transported by the conveyor 36 in the packaging station 38, 40, 42, 44 and 46, where the eggs are Packed for shipment. The two devices 30, 32, shown in figure 2, can provide alternative placements marking device, or they can be used together, for example, to handle various rows of eggs on the multi-row conveyor. In the embodiment, is provided on figure 2, each of the devices 30, 32 is intended for marking two rows of eggs, which are moving through the sorting machine.

Since eggs are moved from the sorting machine to the left, it is clear that the left-marking unit 32 will not perform marking of eggs, which are Packed at the packing stations 38, 40 and 42. Each device 30, 32 can handle two rows a and b of the eggs, as shown in figures 3 and 4.

Each of the marking devices 30, 32, shown in figures 3-10, is equipped with four laser marking modules, these designations 50, for marking eggs in a row and four laser marking modules, these designations 52, for marking eggs in a series Century Series are shown by the lines marked a and b in figures 3, 4, 20 eggs, shown in figure 4. Eggs 20 are transported by pipeline, the specified symbol 54 in which there are exciting device 56 that holds the eggs when they are moving along with the conveyor (for example, as shown in figure 10). The distance between adjacent in a row of eggs, called step, preferably equal to about 76 mm, but may vary. The step size is determined by the manufacturer of the sorting machine, which is a laser marking device for marking eggs. It is extremely desirable that arterovenous device hindering operation of the sorting machine, the speed of movement of the conveyor which can be up to 1.1 m/S.

At this speed marking laser marking head of each of the eggs passing through the marking station takes approximately 69 MS, which means the marking 14 eggs per second. Marking the station operates on part of the conveyor along the lines a and b, where laser marking modules 50 and 52 can mark the eggs, while the laser beams emitted by the modules can be rotated within the sector 58, the size of which is approximately 30-35 degrees, as shown in figure 10. That is, the marking station takes up space defined by the width of the device, defined by the outer surfaces 60 of the casing 62, as shown in figures 3-5.

As shown in figure 6, the laser generator 64, providing the operation of the laser marking modules 50, 52, mounted on the vertical support 66, which, in turn, is connected to the horizontal support 68. The laser generator 64 emits the laser beam 70, which passes through collimating and focusing lens 72, is reflected by mirror 74 and passes through the hollow support tube 76 that is supported by the bracket 78 to the galvanometer deploys the cylinder 80, which directs the beam 70 upwards for marking the passing of 20 eggs.

Preferably used carbon dioxide laser generator 64 with the maximum is echodnou capacity of about 70 watts, standing vertically, if necessary, can be adjusted. As a galvanometer deploys the head preferably used head SCANcube® 7 with a standard digital interface Board RTC® PC or card RTCT SCANalone, which are supplied by the company SCANLAB America, Inc., NAPERVILLE, stillings, USA. Deploys the head has the following characteristics: aperture - 7 mm, the displacement of the beam - 9,98 mm, dynamic tracking error is 0.14 MS, the error angle is less than 6 mrad, practice of the increment of the order of 1% of full scale 0.25 MS, typical positioning speed is 12.0 m/s and the sample rate recording with good quality for characters that are performed in a single pass, at a height of 1 mm - 900 characters/S.

As shown in figures 3-5, each of the laser marking modules 50, 52 is installed in the casing 62 with laser generators 64 associated with the modules 50, which are staggered relative to the laser generators associated with the heads 52, for more efficient use of space and more compact arrangement of all modules. Power of laser generators are located in the lower Cabinet 82. The supporting structure 84 has adjustable legs 86 to align and adjust the position the device vertically on the installation site, and also provided the horizon is Linyi beams 88, holding the casing 62 and provides its movement from the working position shown in figures 3-5, in the designated position, as shown in figure 9.

The possibility of assignment of the casing 62 makes it possible to extract the laser head from the conveyor 36 sorting machine, for holding them if necessary clearances before discharge casing 62 may want to omit the galvanometer deploy head 80. In the example shown in figure 9, this operation is performed using the rotary connecting devices 90, available on each side of the rear part of the casing 62, and located in front of the node 92 of the drive mechanism of the tilt frame, which provides the slope of the entire housing 62, resulting in lowered galvanometer deploy head 80 so that the casing can be removed from the conveyor 36.

On the supporting structure 84 includes a wardrobe 94, which contains controls and operation, including controllers programmed with logic, computers, which can also contain the interface card RTC® for control of galvanometer razvertyvaemye heads 80, modems, to ensure exchange of information between portable computers and network technical means for the transmission of data related to the operation of the equipment. The data files that define graficheskiy designations including the information of the coordinates of vectors, usually downloaded over the network, and from the marking station is transmitted over the network production data that can be used for billing and other purposes. Computers are also connected with the computer system, which is associated with a sorting machine and provides information of the washing device, in particular the temperature of the washing water, the temperature of the wash water and the pH. There are also sensors operating temperature of the laser generators and galvanometer deploy heads 80 and current sensors power sources. Also uses position sensors that provide position control of all the important moving parts of the device. In addition, control the temperature and humidity within each of the cabinets.

There is a keyboard 96 operator and LCD display 98, which provide in situ diagnostics Troubleshooting and maintenance of the device. However, in normal operation, and taking into account the degree of control and transfer of information about the operational status of the need for the presence of the operator's seat for many types of maintenance is minimized. If there is any technical problem, it is usually the employees, whose duties, among other things, the task of controlling the operation of Sortirovochnaya machine 34, can use the keyboard 96 and the display 98 for communication over the network with technical experts who know the marking station, and a large part of the emerging problems can be eliminated. As the device 102 emergency shutdown can be used in the switch 100 of the power of the marking device. Since the working equipment generates heat, and it is located in the production area with a relatively high temperature and humidity, each Cabinet is equipped with a device 104 air-conditioning. From the back side of the device is the main panel 106 on-off power.

Because galvanometer deploy heads 80 are under 20 eggs, there is a probability that any egg will crack, causing its contents may leak at the head 80 and disrupt their work. To protect against such problems is provided by the protective plate 110, are shown in figure 7. It has left and right mounting supports 112, which are attached to the elements 88 on the frame and support a horizontal bearing tube 114 (see figure 8), attached to the plate 116. The plate 116 has round holes 118 are located above the galvanometer razvertyvaemye heads 80 and covered with a protective lens 119 from Germany so that the liquid material is itcause of eggs, will not be able to pass through the holes and get to the head 80. Germanium lenses stronger than glass and pass the laser beam without any distortion. Alternatively, you can use lenses made of zinc selenide, because this substance is also highly transparent to the laser beams. Because germanium lenses are relatively expensive, the size of the holes 118 preferably have the smallest possible dimensions in which they provide the course of the laser beam within the maximum sector. For additional protection galvanometer deploy heads 80 directly above each of the heads installed protective lens 120, as shown in figure 10.

The figure 8 presents an alternative that uses a rectangular hole 118' in the plate 116, and near each such hole is the exit of the air nozzle or air scraper 122, which is connected to the system 126 air flow through the tube 126 and directs the air flow over the holes to blow off in the direction of dripping of the material that it could not penetrate through the holes 118. The work of the air knife 122 can be controlled by an electromagnetic valve 128 in the tube 126. Eight air knife shown in figure 8, preferably is supplied compressed air under pressure of not less than 40 psi with an air flow of 50 ft3 /min. Because the plate 110 attached to a stationary frame 84, it should be possible branch pipes 126 and other components of the system air supply from the laser marking of modules and the casing 62, since the latter can be discharged from the conveyor, as it has already been specified, and the plate remains stationary.

As for marking eggs laser radiation, the use of a more powerful laser does not necessarily lead to an increase in the speed of printing on the surface of the eggs. It will take some time to transfer energy to get the desired result. For example, baked potatoes whole usually requires about 45 minutes, and if you increase thermal capacity, the potatoes can be torn. Provision must also be made such characteristic energy transfer to the egg shell, which allows you to get the desired result. The power of the laser generator sometimes lower, so that the maximum power of 70 watts is not used. Eggs moist and soft shell may require the use of radiant energy, close to the maximum. Practice shows that for the labelling of eggs is more important processing time than the radiated power. For this reason, it is preferable to use for drawing some graphic symbols weight the time interval 138 MS (or MS 69 for some lasers). The preferred magnitude of the focal length of the lens 72 is 100 mm, which allows to obtain the beam width or spot size of about 0.3 mm, Such an optical characteristic allows to provide sufficient depth of focus, which means that the eggs do not have to be the same size. In other words, the change of the distance to the surface of shell eggs by 10 mm associated with different sizes of eggs, will not matter, because the point of focus of the beam may vary in the following ranges.

Laser marking device has four laser marking module 50 or 52 for the labelling of eggs in each row, and four modules put the image in the upper, middle and lower rows (see figure 1). If the speed of the conveyor 54 (see figure 10) is equal to 1.1 m/s, the time marking each egg 20 is only 69 MS. As can be seen in figure 1, the volume and size of the graphical symbols, which are applied to the upper and lower rows 22 and 26, compared with a graphical representation, which is applied in the middle row 24 and which may be quite complex, as shown in figures 11-15. In this embodiment, the device proposed in the present invention, two laser marking module are used for printing on lines 22 and 26, and the other two heads of use who are for printing in the middle row on striped eggs. In this arrangement, marking the time interval 69 MS effectively doubled to up to 138 MS, each of the two modules causes the marking on every second egg. When using this scheme with the alternation is possible to perform more complex and volumetric markings on the middle row 24. While laser marking modules 50, which put the symbols on the top 22 and bottom 26 rows, work in a time interval of 69 MS for marking each passing egg, each of the other two heads 50, which put the symbols on the middle row 24 will operate within overlapping time intervals 138 MS, so that both heads at the same time to put marks on the eggs during the greater part of the specified interval 138 MS.

If the egg should be applied to a graphical notation, this is done by generating a set of vectors in the physical coordinate system, having a maximum size of 20 mm × 40 mm Graphic symbol presented on the figure 11, is composed of 572 vectors, such as, for example, the vector 130 having initial point 132 and the end point 134. Each start and end point have coordinates X and Y, and each vector is a straight line.

The coordinates of the start and end points of each vector must be C is programmed. Typically, this is done using software tools to automatically convert images, providing a vector representation of the image. For example, can be used CorelDRAW®, which can provide a vector representation of the graphics of the bitmap representation. However, the effectiveness of such software tools may be insufficient, resulting in the need to resort to a manual representation of some types of graphic symbols to obtain the necessary results. The graph can be represented in the PostScipt format (file extension .pps .ps). You can also use the format of the graphic file with the .pit extension based on vector graphics.

Usually, as the representation of the graphical object unfolds in time and space, all lines in the left third of the image is preferably performed before the playback middle of the third part, and, similarly, all the lines of the middle third part of the play (applied) to start playback right third of the image. It is very long vector typically be divided into parts. The image is built from left to right, but it is not necessary to reproduce in the same order. However, you cannot play back is the input vector, starting on the left edge of the image, if the main part of the displayed symbols is reproduced in the right third part. To enable the playback order of each vector must be programmed and included in an electronic file representation of the graphic symbols. Programming is carried out so that all the vectors have been specified in accordance with these requirements.

Based on the fact that eggs are moving at a given speed, and known and/or set parameters of the galvanometer heads, such as the times turn-on delay and turn-off times to reinstall, positioning speed, and given that the reproduction is given only 70 MS, is determined by the speed of marking or recording for playback designation on the basis of such original positions, and also determines the ability to effectively play symbols. Since all vectors are known, together with the above parameters, you can calculate the speed of the recording galvanometer deploys the head 80 that is required to play the entire image. Experiments have shown that for 138 MS may be reproduced with acceptable quality about 200 vectors. Because the physical size of the image area on the egg is 20 mm × 40 mm, some who ectory can be eliminated without significantly affecting the visual quality of the reproduced image. The speed of the marking is preferably in the range of 400-800 bit/MS, and at a speed of 800 bits/MS obtained acceptable quality, at a speed of 600 bit/MS - good quality and at a speed of 400 bits/MS - excellent quality. While the physical space coordinate system, which is the area of 20 mm × 40 mm on the surface of the eggs, correspond to the binary values from 0 to 65535 (16 bits for each coordinate), and deploys a galvanometer head 80 can pass the beam all field 655535 bit 65 MS at a speed of marking, equal to 1000. When the above-mentioned focal length speed 1000 marking corresponds to a distance of approximately 100 mm per 1 MS. The image quality may affect the quality of the eggs, so that the marking system on the good eggs at a certain set of parameters that can be of good quality, but bad eggs mark quality may deteriorate.

If the image such as, for example, shown in figure 11, can not be engraved in the allotted time interval, the representation of the image can be simplified, for example, due to the refinement of vectors and use the raster scan, but so that the visual quality of an image was maintained at an acceptable level.

The procedure of refinement vectors about which has a simplified representation by reducing the number of vectors using the algorithm, similar to the algorithm of Douglas-View-Pecera smooth curves and generalization used in digital cartography. Method of elimination of the intermediate points, that is, vectors, consists in connecting two points of a line is a straight line, called the base line. Then calculated the distance perpendicular from this baseline, all intermediate points. If all these distances do not exceed a specified value, representing half the width of the graphic lines on the scale of the source, these points can be discarded, and the line image may be represented by the baseline. If any of these intermediate points is outside the range determined by the specified value, the line is divided into two parts in the most remote point, and the procedure is repeated now for two of the received parts.

Raster scanning is the conversion of all vectors in a raster on a fixed grid coordinates, which allows to determine the existence of coincident points, the result of which can be removed duplicate coordinates. If the two vectors are the same, then one of them is excluded. The grid is set, and the vectors are drawn on the grid from the longest to the shortest. If a new vector is drawn without changing any of the grid, this would mean that h is on he is on top of the other, and the point or points of convergence are removed by turning off the laser at these points. This is done using the digital differential analysis. This decrease in density raster allows you to ensure the exclusion of elements of vectors, at which there are no additional graphics artifacts. In this case, technically is not a grid, and an inner mesh memory. If the vectors from the longest to the shortest, is converted to a raster scan, and when there is a transition to short vectors, and they overlap zone of new grids, to the final representation of the image, nothing is added, and they are excluded.

In the proposed in the invention method uses a digital differential analysis, which is similar to the analysis described in the information source "Digital differential analyzer for lines", Jon Kirwan, published on the website http://users.easystreet.com/jkirwan/dda.html, ©, November 1999, uses a set of coordinates specifying the number of lines. This publication is specifically entered by reference into the present application. If the duplicate grid points have already been recorded, then this portion of the vector is eliminated. The mesh preferably is a matrix of size 16×16 bits, which is converted into the physical grid of 15×15 bits, overlay window 20×40 mm is poverhnosti eggs. Therefore, the physical coordinate grid contains approximately 65536 blocks. The grid, shown in the upper right corner of figure 15, illustrates the size of the blocks of the grid.

Very short vectors and a point or close to the point artifacts can be deleted as well, because after playing they are not visible. This method together with other methods used to reduce the number of vectors from 572 shown in figure 11, to 227, shown in figure 12.

The methodology used is illustrated in figures 11-14, part 136 figure 11, shown in figure 13, compared with the same part 138 a simplified representation in figure 14. Line part 138, shown in figure 14, are slightly different and simplified form from the lines of part 136, shown in figure 13, and the enlarged view of zone 140 figure 14 are shown in figure 15.

Example simplify by reducing the number of vectors is shown by a comparison of the United vectors 142, 144, 146, 148, 150, 152 and 154 depicted in figure 13, with a simplified version containing the vectors 156, 158, 160 and 162, shown in figure 14. Although these two variants appear to have sufficient differences in the zoomed figures 13 and 14, but in reality they look almost identical, as shown in blocks 136 and 138 figures 11 and 12.

An example of a raster scan is represented by block 140 figure 14, which in uvelichenie is represented in figure 15. Transformation vectors 164, 166 and 168 in raster form shows that they overlap with each other in a shaded area. Therefore, the address representing repeating points that are used to turn off the laser marking heads at the appropriate time, so that the laser beam will act on those point only once.

If the line is produced by a laser beam, has a discrete width, then another technique that can be used, prevents excessive thermal effect on the surface when two lines intersect or are very close to each other in some place. In this case, the boundaries of the vector can be compared with the boundaries of another vector with subsequent refinement of the vectors if necessary. Since switching on and off of the laser takes some time, on the complexity of the process of refinement vectors superimposed problem transients when switching on/off of the laser beam.

Galvanometer deploy heads 80 are controlled interface cards RTC computers programmed to use 16-bit coordinate system. To compensate for the movement of the object, in this case eggs, which must be marked, the picture elements are shifted to the right edge.

This cannot be done using the two 16-bit coordinate system, therefore, the transformation is a 15-bit physical box, resulting in the size of the coordinate space is reduced by almost half. The adjustment matrix does not take into account the coordinates outside of the 15-bit space. Thus, the image is positioned in the virtual space, so that when the egg is in the area of marking, galvanometer deploy heads 80 are shifted to the edge and immediately begin playback of the image.

Such technology is necessary because a complete representation of the image must be transmitted in a galvanometer system in the coordinate system. Without virtual conversion will need to view the entire image was within the physical window before you start playback, the playback time is significantly reduced. This technology allows the system to reproduce an image within a window, that is, during the whole time when you might be playing.

If it is used exclusively real or underlying coordinate system, the marking system can't start playback image, if the entire image will not be within the spatial window. Graphic symbols shift who are as close as possible to the right edge of the relative coordinate system. Thus, when the galvanometer deploys a head 80 should start playing, it will move to the right and will move along the moving egg, so that when the egg is in the real coordinate system, management galvanometer deploys the head 80 may be implemented so that it is moved to the point corresponding to the physical coordinate, that is on the edge of the physical space, so that the head can start playback of the image when it appears in 15-bit coordinate space.

May experience an urgent need to embodiments of the present invention provided the labeling of the various objects of different graphic symbols. In the case marking of eggs may need to be applied on 12 eggs, which are Packed in one carton, 12 different graphic symbols, namely advertising signs for 12 different products or 12 different messages. The complexity of the graphical symbols may vary within wide limits. For complex symbols may need to increase the speed of the marking relative to the maximum in order to have time to put all designation. A higher playback speed will reduce the contrast of the image,and, accordingly, a slower speed will increase contrast. It is desirable that the image contrast was possible, and therefore, it is desirable that each graphic symbol is deposited on the object using the entire time interval (MS 69 or 138 MS). Because each image is contained in a separate file, the optimum rate of application of each image is also stored in this file, and the operating parameters of the device thus configured, or configured to use the entire time interval. In the above example, the need to apply 12 different symbols on 12 eggs in a carton packaging device in accordance with the invention most likely will have to change their operating parameters for marking on each egg, the image different from the image for the previous eggs. This configuration flexibility ensures the effectiveness and quality of the marking process.

While considered different embodiments of the present invention, it is necessary to understand that the average person skilled in the art will clear modifications, substitutions and alternatives such options. Such modifications, substitutions and alternatives can be made without departing from the and limits the nature and scope of the invention, which are attached formula.

1. Device for printing on individual objects using a laser marking station containing:
at least one processor that is designed to control the laser marking individual objects; and
at least first and second laser marking modules, controlled at least partially by at least one processor, and the first and second laser marking modules installed near at least one way in which the objects are at the specified speed, and are intended for the direction of the laser beam on the object for marking symbols as objects pass through the marking station; and the first and second laser marking modules are designed to perform marking objects as the objects pass through the marking station; and the first and second laser marking modules made with the possibility of marking the first of these objects, and the second laser marking module is configured to begin the process of marking an object, following the first object while the first marking module continues to mark the first object.

2. The device according to claim 1, in which the designations applied first and is that laser marking modules, one or more graphic symbols.

3. The device according to claim 1, in which a particular window contains a range of motion of the laser beam emitted by the first and second laser marking modules at a certain time interval.

4. The device according to claim 3, in which each of the first and second laser marking module contains a laser generator and galvanic razvertyvaemye head, designed for the application of graphical symbols, which are formed in the form of a set of vectors in accordance with the information of the coordinates of vectors, and in which at least one processor is designed for reading digital files that specify the information of the coordinate vectors for a specific graphic symbols that laser marking modules reproduce the object.

5. The device according to claim 4, in which the digital files specify additional playback order designations laser marking module, so that the vectors are reproduced in the order of the vectors in the direction of movement of objects.

6. The device according to claim 4, in which the digital files for a specific graphic symbols set additionally certain speed labeling galvanic deploys the head to play each specific graphic is anyone notation.

7. The device according to claim 6, in which objects are eggs, and in which as a certain speed marking on objects to select the speed of marking, in which you can provide the specified contrast applied to the eggs and set the minimum speed of application, in which you can provide a complete reproduction of the specific graphic symbols within a given time interval.

8. The device according to claim 5, in which determining the order of application of vectors minimizes the distance from the end of one vector to the beginning of the next vector, which should be applied.

9. The device according to claim 4, in which the preset transport speed is about 66 m/min

10. The device according to claim 4, in which the laser generators are carbon dioxide lasers with a maximum output power of about 70 W, generating a laser beam, which can be applied to the object line width of about 0.3 mm

11. The device according to claim 1, in which the preset transport speed is about 66 m/min

12. The device according to claim 1, in which the graphic symbols include text and images.

13. The device according to claim 1, in which objects are chicken eggs.

14. Device for laser marking of eggs, when they are transported at least p is one way Meres machine sorting eggs, contains:
at least one processor for controlling the operation of the device, including a storage device for storing digital information that specifies the various graphic symbols;
many laser marking module functionally connected to the processor and intended for application at least two graphical symbols for eggs to be transported at least one path, each of the laser marking module contains:
a generator capable of generating a laser beam output;
galvanometer razvertyvaemye head mounted near at least one path and intended for receiving the laser beam and the direction of its eggs as they are transported at least one path,
the first and second laser marking modules made with the possibility of marking the first of these objects, and the second laser marking module is configured to begin the process of marking an object, following the first object while the first marking module continues to mark the first object.

15. The device according to 14, in which the laser marking modules are installed with the possibility of their diversion from at least one path.

16. The device according to 14, in which each laser marking m is Dul has a bracket with a Central channel, on which the laser beam passes from the generator to deploys the head.

17. The device 14, which further contains a variety of protective lenses to deploy the heads and the protective plate, passing over razvertyvaemye heads and having a hole directly above the lens through which the laser beams can pass from deploying heads in the direction of the eggs.

18. The device 14, which further contains lenses of Germany in each of the holes through which the laser beams can pass from deploying heads in the direction of the eggs, preventing the passage of any material through the holes.

19. The device 17, which further contains at least one of the air knife, deflecting the air flow over the holes for the blowing of the material away from the hole.

20. The device according to clause 16, which provides multiple paths and at least three laser marking module for each of the multiple paths.

21. The device according to claim 20, in which the laser generator is installed approximately in the vertical direction, and each generates a laser beam approximately in the vertical direction in one end, each of the laser marking module provided with at least one mirror for directing the respective laser Lou who and the corresponding razvertyvaemye head.

22. Method of laser marking individual objects as they pass through at least one path through a marking station at a first given speed, including:
the inclusion of the first laser to begin the process of marking the first object when it is included in the marking station, and continued marking of the object during the first time interval specified in the marking station;
the inclusion of the second laser to begin the process of marking the next object when it is included in the marking station, and continued marking the next object during the second time interval specified in the marking station;
moreover, the first and second set intervals overlap, so there may be simultaneous labeling of both objects at least for part of these intervals.

23. The method according to item 22, in which the first and second time intervals are approximately the same length.

24. The method according to item 22, in which the preset speed is about 66 m/min

25. The method according to item 22, in which the laser includes a laser generator, galvanometer razvertyvaemye head, designed for marking objects in accordance with the information of the coordinates of the vectors.

26. The method according to item 22, in which the laser generator is used is pakisatni laser maximum power of about 70 W, generating a laser beam, which can be applied to the object line width of about 0.3 mm

27. The method according to item 22, in which the duration of the first and second set of time intervals is in the range from about 135 MS to 140 MS, with the first set speed equal to about 66 m/min

28. The method according to item 22, in which objects are eggs, and a marking station is connected to a machine for sorting eggs.

29. The method of applying the graphic symbols using at least one processor of a digital file that can be played on a moving surface using a scanning laser using a vector at a given speed labeling within a given time interval, and the method includes:
the establishment of a grid that represents the total size of the graphic symbols, which must be reproduced;
the establishment of a set of vectors on the grid, which allow to reproduce the graphic symbol with a sufficient degree of visual clarity;
splitting long vectors for a few short, if the length of such long vectors exceeds approximately one third of the width of the grid;
determining the total length of the vectors, which should be reproduced, and the simplification of vectors, if the total length does not allow vosproizvel is all vectors within a given time interval; and
determining at least one of the playback order of the vectors of the laser, so that they are played, usually in the order of the vectors in the direction of travel of the objects,
storing the digital file containing the information of the coordinate vectors for reproduction vectors in permanent machine-readable media.

30. The method according to clause 29, in which the simplification of vectors includes at least one of the following stages:
transformation of vectors in a matrix of bits and eliminating duplicate bits;
exception vectors located close to other vectors, if such exclusion would not affect the visual clarity of the graphic symbols;
the exception artifacts and points that do not affect the visual clarity of the graphical notation.

31. The method according to item 30, in which the matrix of bits contains at least 65000 bits.

32. The method according to clause 29, in which the speed of printing is in the range from about 400 bits/MS to about 800 bits/msec.

33. The method according to clause 29, which define playback order of the vectors is determined at least to ensure minimization of distance from the end of one vector to the beginning of the next vector to be played.

34. The method according to p, in which the surface represents the shell of the egg.

35. The method according to clause 34, in which the file is going to win the data specifies the speed of the marking chicken egg, which provides the desired contrast plotted symbols.

36. The method according to clause 34, in which the data set the minimum speed, providing a complete reproduction of the specific graphic symbols within a given time interval.

37. Device for printing on a separate eggs as they are transported at least one path of the sorting system of eggs, and the device includes:
at least one processor that is designed to control the laser marking, including a storage device for storing digital information that specifies the various graphic symbols; and
many laser marking modules connected to the processor and intended for labeling for applying at least two graphical symbols for eggs to be transported at least one path;
each laser marking module contains:
a generator capable of generating a laser beam output;
galvanometer razvertyvaemye head mounted near at least one path and intended for receiving the laser beam and the direction of its eggs as they are transported at least one path, and deploys the head is installed on the bracket, that puts razvertyvaemye head relative to the at least one path, and at the same time
the first and second laser marking modules made with the possibility of marking the first of these objects, and the second laser marking module is configured to begin the process of marking an object, following the first object while the first marking module continues to mark the first object.

38. The device according to clause 37, in which the laser marking modules are installed with the possibility of their diversion from at least one path.

39. The device according to clause 37, in which each laser marking module has an elongated bracket with a Central channel through which the corresponding laser beam passes from the corresponding generator to the corresponding deploys the head.

40. The device according to § 39, which contains multiple paths and at least three laser marking module for each of the multiple paths.

41. The device according to p, in which the laser generator is installed approximately in the vertical direction and each generates a laser beam approximately in the vertical direction on one of its end, every laser marking module provided with at least one mirror for directing the respective laser beam in the corresponding resort the living head.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to metal or alloy laser engraving and may be used in various branches of machine building, medicine, etc. First, laser radiation power sufficient for structural alteration of metal or alloy surface sections. Plotted is calibration curve of metal or alloy fraction sprayed by laser radiation at definite power level trapped by fluid, in fact, translucent for laser beam and dependent upon depth of engraved metal or alloy surface in fluid. Then metal to be cut is dipped in fluid to depth defined by said calibration curve. Laser beam is spatially swept over metal or alloy surface in, at least, one coordinate. Said laser beam is translated and, at a tone, rotated with radius R. Said radius and angular rotation speed ω are defined from relationship: R=d/2-r, mcm and 2πR·ω>V, m/s, where: D is width of laser beam cutting width, mcm; r is laser beam radius, mcm; V is translation speed, m/s.

EFFECT: higher quality, no harmful effects to environments.

9 cl, 3 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to engraving of images by output laser signal applied to material. Output laser signal is displaced relative to material at high speed exceeding 10 m/s to engrave at constant power of output laser signal exceeding 500 W. Proposed engraving system comprises laser, system of mirrors for displacement laser output signal that allows control over laser signal power and speed. Control device allows computation capacity making 10000 pixels a second.

EFFECT: engraving on construction components.

39 cl, 2 dwg, 3 tbl

FIELD: printing industry.

SUBSTANCE: invention relates to a method of manufacturing a protection property for the protective element, counterfeit-proof paper or data medium. The method of manufacturing a protection property for the protective element comprising a substrate which has at least one through hole and at least one marking in accurate register with this hole. The substrate, at least in the area of the manufactured marking is equipped with a marking substance modifiable by laser. During the same technological operation by exposure of laser radiation at high laser power at least one through hole is made in the substrate. By exposure of laser radiation at lower laser power at the marking area the marking substance is modified and thus at least one marking is created in accurate register with the through hole.

EFFECT: proposed protection property enhances the counterfeit protection level of the protective element.

23 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: preliminary construction of calibration curve of dependence of etching depth of specimen surface of the specified metal or its alloy on parameters of incident laser radiation to surface is performed at monotonic increase in specific power of laser radiation from value of 0.1 J/cm2·s to the value at which molten drops are formed on etched surface. Then, spatial control of laser beam scanning on surface of metal or its alloy is performed at least as per one coordinate. Simultaneously with translational movement of laser beam there performed is its rotation with radius R. Radius R and angular rotation speed of laser beam is chosen considering the cut width and radius of laser beam.

EFFECT: improvement of the method.

5 cl, 3 dwg, 1 ex

FIELD: process engineering.

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3 cl, 3 dwg

FIELD: physics, optics.

SUBSTANCE: device for transferring an image onto a wooden base has apparatus for receiving and/or creating an image. At least one source of a laser beam. Apparatus for moving the laser beam with rotation and/or translational movement of the laser beam relative the said wooden base or vice versa - for moving the wooden base relative the laser beam, as well as for focusing the laser beam onto the said base. At least one module for regulating radiation power of the laser beam. At least one module for controlling the said movement and focusing apparatus. Apparatus for converting information of the said image into an instruction for the said at least one regulation module and the said at least one control module. The said at least one regulation module regulates radiation power of the laser beam by directly changing pumping of the active substance and/or changing operation of the modulator located in the resonator of the source of the laser beam.

EFFECT: solution enables reproduction of images on a wooden base with an irregular shape with high accuracy and speed of processing, as well as high depth of transfer within the base.

22 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: invention refers to method of laser labelling surface of metal or its alloy and can be implemented in machine building, jewellery industry and medicine. The method consists in preliminary plotting a calibration curve of dependence of depth of marking surface of a sample of specified metal or its alloy by means of effect of specific power of radiation incoming on surface. By means of a computer there is generated a protective digital code, where specific depth of marking and specific power of laser radiation correspond to each digit. A mark visible by a naked eye is applied on the marked surface of metal or its alloy by means of laser radiation transferred along marked surface; this mark corresponds to alpha-numeric or graphical information. A protective digital code in form of sequence of recesses invisible to a naked eye is applied on the produced surface visible to a naked eye; this code is marked by laser radiation of specific power chosen from the said calibrating curve.

EFFECT: high level of protection and simplified process.

8 cl, 5 dwg, 1 tbl, 1 ex

FIELD: printing industry.

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32 cl, 16 dwg

FIELD: technological processes.

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EFFECT: high quality of applied image, increased resource of equipment, higher speed of image application, and also expansion of field of materials suitable for application of images.

6 dwg

FIELD: technological processes.

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13 cl, 16 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to appliances intended for marking metal articles for verifying legality of their production. Coded message is produced on metal article surface by laser local heating source. Note here that prints consisting of nanostructures of oxides of metal elements to be red by aforesaid reader. Coding is performed in binary system based on availability (1) or absence (0) of aforesaid print. Information is coded by compiling private tables on the basis of IBM coding. Note here that generation of coded message is controlled by computer proceeding from pre-calculated parameters of effects. Said parameters are calculated by adduced laws.

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5 cl, 2 tbl

FIELD: metallurgy.

SUBSTANCE: preliminary construction of calibration curve of dependence of etching depth of specimen surface of the specified metal or its alloy on parameters of incident laser radiation to surface is performed at monotonic increase in specific power of laser radiation from value of 0.1 J/cm2·s to the value at which molten drops are formed on etched surface. Then, spatial control of laser beam scanning on surface of metal or its alloy is performed at least as per one coordinate. Simultaneously with translational movement of laser beam there performed is its rotation with radius R. Radius R and angular rotation speed of laser beam is chosen considering the cut width and radius of laser beam.

EFFECT: improvement of the method.

5 cl, 3 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to laser cold working. First layer is applied on article billet. First layer does not contain cavities or bubbles with diameter exceeding 10 micrometres. First layer is evaporated or produced by dipping. Second layer is applied on first layer. Then, laser pulse is send onto second layer. Said pulse features sufficient power density for ablation of second layer section. Thereafter, plasma is ejected. Said plasma generates shock wave propagating onto first layer and billet for cold working. Whatever bubbles formed under top layers is isolated from surface to be cold worked.

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28 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to jewels production, particularly, to laser etching of images on articles from noble metals. In compliance with first version, article is polished to purity class of not over 9th and cleaned for the article to be fixed. Computer image is entered into laser radiator program unit and applied on article surface by laser beam tuned to point burning-through. Then, finished article is cleaned of carbon. In compliance with second version, prior to applying the image, surface of article is coated by rhodium.

EFFECT: improved quality, lower costs.

2 cl, 2 ex

FIELD: machine building.

SUBSTANCE: invention refers to method of laser labelling surface of metal or its alloy and can be implemented in machine building, jewellery industry and medicine. The method consists in preliminary plotting a calibration curve of dependence of depth of marking surface of a sample of specified metal or its alloy by means of effect of specific power of radiation incoming on surface. By means of a computer there is generated a protective digital code, where specific depth of marking and specific power of laser radiation correspond to each digit. A mark visible by a naked eye is applied on the marked surface of metal or its alloy by means of laser radiation transferred along marked surface; this mark corresponds to alpha-numeric or graphical information. A protective digital code in form of sequence of recesses invisible to a naked eye is applied on the produced surface visible to a naked eye; this code is marked by laser radiation of specific power chosen from the said calibrating curve.

EFFECT: high level of protection and simplified process.

8 cl, 5 dwg, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: wheel pair is installed and fixed in rotating facility. Matte coating eliminating reflection of laser beam is applied on surface subject to treatment with CO2-laser. Focusing system is adjusted so, that diametre of laser radiation spot corresponds to a chosen mode. Required rates of wheel pair rotation and laser beam transfer are set by means of program controlled device. Compressed air blows off a flare of products of combustion into exhaust ventilation; laser treatment is carried out under a chosen mode to obtaining geometry of paths of laser strengthening eliminating melting zones of thermal effect and mutual overlapping of laser strengthening paths.

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1 dwg

FIELD: nanotechnology.

SUBSTANCE: invention refers to method of coloured image formation on metallic surfaces (text and graphic, monochrome and coloured) by means of forming nanostructures in kind of oxide films resulted in process of local heating with heat source of pulse effect (for example, laser radiation, plasma, electro-contacting or other kind of heating). Properties of oxide films (physic-mechanical, geometrical, colorimetric and others) depend on technological parametres of heat effect source, which in their turn are determined with thermal-technical properties of a treated material. The method proceeds from calculation of mode of thermo-pulse effect and of distance between zones of impulse effect in dependence on thermo-physic characteristics of material and parametres of image in such a way, that temperature to be created in the zone of effect will be required and sufficient to form oxide film with a specified colorimetric property.

EFFECT: possibility to apply coloured image on any metal surfaces without their preliminary treatment and without preliminary plotting of graduated curves.

2 cl, 4 dwg, 1 ex

FIELD: jewelry.

SUBSTANCE: invention relates to methods of applying images on precious metal products by laser engraving. Method includes polishing product surface, itsrefinement, product fixation and further application of image on product by beam of laser irradiator, in whose program block computer image was preliminarily transferred. Surface polishing and refinement are performed until 9-class surface roughness is achieved. Before product fixation its surface is moistened with silicon-organic polyethylsiloxane liquid. Image is applied by point melting of surface with laser beam to 14-class roughness of product surface. Before image application product surface is covered with rhodium.

EFFECT: giving image contour three-dimensional effect.

2 cl, 1 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to method and system of application of sign and graphic information on items and may be used for laser marking, engraving in different fields of engineering. Physicochemical transformation of multi-layer coating is implemented by means of laser radiation effect onto stock with constant monitoring of parameters and correction of program of sign and graphic information application. System consists of laser radiation source, optical system for focusing of radiation and deflection system, which have control input from computer, system of stock fixing, analysing device, which is installed in system of stock fixing, and external source of light with variable brightness.

EFFECT: provides repetition and homogeneity of light technical properties of items; reduction of cost of their manufacture.

2 cl, 2 dwg

FIELD: electronic engineering.

SUBSTANCE: method comprises processing the blank surface with the concentrated radiation flux. The radiation flux is directed to the surface to be processed and repeatedly moves over the surface thus forming required microrelief. The process is controlled by a computer.

EFFECT: improved quality of the microrelief.

4 cl, 3 dwg

FIELD: food and light industry.

SUBSTANCE: invention relates to processing of articles and forming of picture inside transparent or semitransparent materials. System includes optical unit to form laser punctures in article material combination of which composes number of symbols of marking picture, unit to feed article to zone of marking and process control unit. Optical unit contains pulse laser set with at least one optical channel connected with unit of article scanning and/or positioning relative to focusing lens of laser set. Process control unit is furnished with device for time synchronization of beginning of marking with position of zone of article marking. Laser pulse frequency index, capacity of conveyor and number of channels are related by mathematical dependence. Invention makes it possible to form pictures by marks inside thin-walled articles with curvilinear surface under conditions of high-speed conveyor production.

EFFECT: improved reliability of marking non-reproducible under other conditions.

5 cl, 1 ex, 1 dwg

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