Tympan of vibrating roller, printing apparatuses of printing machine

FIELD: tympan of vibrating roller, printing apparatuses of printing machine.

SUBSTANCE: tympan on lateral surface of roller, for example roller of printing apparatus has elastic and(or) compressible layer whose contact stress P depends upon value of depression. Said layer is formed in such a way that to provide relationship of contact stress from depression value grown up to 700 N/cm2 at least in separate zones.

EFFECT: possibility for providing by simple means high quality of printed products due to lowered response to vibration and to distortion of printing process.

46 cl, 8 dwg

 

The present invention relates to Dekel on the shaft, respectively, on the transfer cylinder, and the printing apparatus of the printing machine according to the restrictive parts of paragraphs 1, 2 and 9, 13 or 34.

From patent application DE Germany 69107317 T2 is known decline fabric, consisting of several layers and having an extreme case of a total thickness of from 0.55 to 3,65 mm Modulus of elasticity of the layers of cellular rubber lies in the interval from 0.2 to 50 MPa, respectively, from 0.1 to 25 MPa. Due to its special construction and properties of the layers get decline canvas that if compression does not show tendency to lateral displacement, respectively, the protrusion.

In the patent application DE Germany 1940852 A1 discloses Dekel for offset printing, which has a total thickness of about 1.9 mm As indicated in the application, the shear modulus as a voltage at 0.25-mm deformation for proper thickness deckle is approximately 4,6; 1,9 or 8,23 kg/cm2. The aim is to achieve rapid recovery of shape after indentation, and narrow tolerances on thickness.

In the patent application Switzerland SN 426903 revealed offset canvas, and describes the usual depth of indentation from 0 to 0.1 mm Increase dents from 0.05 to 0.1 mm requires, accordingly has the effect, change the contact stress about 20.6 N/cm 2. In other words, when this depth interval indentation and contact voltage of up to approximately 40 N/cm2it turns out linearized "characteristic curve elasticity" with the rise of about 412 (N/cm2)/mm

In international patent application WO 01/39974 A2 disclosed printing apparatus with two interacting in the installation position of the cylinder and the plate cylinder is in the area of its lateral surface of the hole passing axially of the channel for securing the end of one or more printing plates, and cooperating with the plate cylinder in the contact zone of the transfer cylinder is in the area of its lateral surface of the elastic rubber blade.

For transfer of ink or other liquids between the two rollers of the printing machine, for example, in a colorful and/or moisturizing apparatus and, in particular, in offset fashion between the printing cylinders, typically uses a combination of materials "hard-soft". Necessary to transfer the paint surface pressure is achieved by flattening pliable, such as elastomeric layer [soft/elastomeric coating/Dekel, rubber cloth, metal cloth, sleeve(=sleeve)] interacts with the cylinder with a practically incompressible and inelastic lateral surface.

For uniform transfer fluid exists, the state condition is defined in the narrow limits of the installation effort as well as its consistency. If there are fluctuations in the distance between the cooperating rollers, for example, as a result of imbalance or vibration caused by irregularities in the running rollers, the installation force (surface pressure) is changed and thereby changes the transfer fluid. Thus, for example, periodically reduces the surface tension in places interrupted, reduced touch, for example in the area of the clamping grooves for the plates or rubber cloth, which leads to the excitation of vibrations of the printing cylinder. In the sector of printing technology, this manifests itself by changes in the intensity of the color on the print. If, for example, long-term changes setting forces under the action of external conditions (long-term disturbance) there is a risk to get right up to the time of repair, too pale or too intensely colored printed paper. In case of dynamic changes of the installation effort due to vibrations (short-term disturbance) it is manifested in the formation of visible bands in printed output.

The basis of the invention is to offer Dekel on the shaft, respectively, on the transfer cylinder, and a printing apparatus of the printing machine.

This problem is solved according to the invention with which Reznikov paragraph 1, 2 and 9, 13 or 34 of the claims.

Achieved thanks to the advantages of the invention are, in particular, that decreases sensitivity to changes in accordance with fluctuations in the installation force (contact voltage), and thus provides the ability to obtain and maintain a more simple means high quality printed products. With the help of special deckles, optimized calculation of cylinders and their arrangement can be reduced, the influence of the movements of the cylinder to transfer the ink. In a particularly preferred embodiment, the bottlenecks terminated, reduced, touch is, moreover, a decrease in the excitation of vibrations.

Design deckle and/or mutual arrangement of rollers substantially reduce the effect of vibrations on the transfer fluid. This also applies, for example, and disturbances caused by changes in the technological process (speed, variable material thickness paintings, supply in the working position, respectively, output from the operating position of the other rollers), the variance of the distances due to inaccuracies in the cart (stops, the final stiffness, manufacturing tolerances), as well as due to changes in the thickness of the deckle because of its wear (long-term disturbance) and/or incomplete Voss is the resolution to its original position after passage of the contact zone cylinder (short-term or long-term disturbance).

This is achieved, in particular, the fact that Dekel is constructed, respectively, the cylinder is performed with the corresponding Dekel so that the dependence of the resulting contact stress when you change the indentation is much more flat than usual. The characteristic curve of elasticity, i.e. the rise of the dependence of the contact voltage from the indentation is at least in the preferred interval for pressing in the on position of the maximum pressure 700 (N/cm2)/mm

The preferred spacing relative indentation deckle in the operating mode (enabled onset) is, for example, from 5 to 10%. However, in some cases, depending on the type of both interacting rollers for optimum results in respect of the required transfer fluid at a minimum the effects of fluctuations may be preferred other intervals relative indentation other than specified above.

In a preferred embodiment, the contact voltage in the on position the pressure is changed to the maximum in the range from 60 to 220 N/cm2and for liquids such as printing inks with very different rheological properties, and/or different methods of printing, these intervals can be different in PR the matters specified interval. In particular, in these intervals, respectively, the intermediate intervals, the curve must satisfy the condition of the lift.

The width of the contact zone resulting from the compression rollers to each other, still maintained, as a rule, how can small. Extended place of clip is the reason for the higher linear power and thus leads to stronger static deflection. However, this disadvantage is compensated by the strong presence of the proposed according to the invention by Dekel, respectively, the location of the roller. The width of the clamp is in a preferred embodiment, at least 10 mm, in particular it is greater than or equal to 12 mm, thus ensuring optimum contact pressure.

For the case when the vibration is caused by the violation, such as rupture lateral surface directly or through the interactive canvas cushions, this vibration, respectively, its amplitude can be reduced by a corresponding execution of the deckle and/or the appropriate location of the rollers relative to each other. This applies in particular to the execution, when the width of the gap in the circumferential direction is maximum in the ratio of 1:3 to the width of the clamping band of print).

In General, Dekel, respectively, the layer allows the use of a printing cylinder with a smaller diameter or breadline, i.e. having a greater length than diameter.

Below the invention is explained more examples of its implementation with reference to the accompanying drawings in which the figures show:

Figure 1 - linear force between the two rollers with conventional deckle (schematically);

Figure 2 - linear force between two platens using deckle according to the invention (schematically);

Figure 3 - measured contact voltage with the variation of the indentation;

Figure 4 - example of a printing section;

5 is an example of executing the printing section;

6 is an example of executing the printing section;

Fig.7 is an example of a printing section;

Fig - schematically an example of executing deckle with bearing layer.

A working machine, such as printing machine, has a rolling one upon the other cylinders 01; 02, which in their touch form a clamping area 03, for example, the gap between rollers 03. In the case of the printing machine it can be cylinders 01; 02 colourful apparatus, coating apparatus, or the cylinders 01; 02 of the printing apparatus. Shown in figure 1 the example of executing the cylinders 01; 02 represent the plate cylinder 01 with an effective diameter of DwPZand the transfer cylinder 02 offset printing apparatus. One of the cylinders 01; 02, for example a transfer cylinder 02, is on the side of practically incompressible elasticdog core 04 with diameter D GZKDekel 05 or 05 tire with a soft, elastomeric layer 06 thickness t. The total thickness T of the deckle 05 is formed, for example, of the thickness t of the layer 06 and thickness, if necessary, connected with the layer 06 mostly incompressible stiff base layer 10, for example a metal plate (shown as example for Fig). If Dekel 05 no additional carrier layer 10, the thickness t corresponds to the total thickness of the Layer So 06 can be made multi-layer, i.e. in the form of an inhomogeneous layer consisting of several layers, which have the required amount for the layer 06 property. Core 04 and Dekel 05, respectively Detelina tire 05, together form the effective diameter of DwPZthe transfer cylinder 02. The effective diameter of DwPZdetermined at the effective rolling of the lateral surface of the plate cylinder 01 and includes printed on the side surface of the elementary body 07 rolling Dekel 08, for example the print the form 08. The cylinder 01 hard surface can also be made in the form of a cylinder 01 backpressure, interacting with the transfer cylinder 02. However, shown below is the implementation layer 06 is not tied to the performance of the rollers 01; 02 as gear and plate cylinders 01; 02 or to the execution of the print form 08.

Depending on the degree of convergence of both cylinders 01; 02, teach their axial distance a, almost incompressible inelastic lateral surface of the plate cylinder 01 "immersed" in the soft layer 06 and leaves a dent S in comparison with undisturbed contour layer 06. Under the action of forces return fluctuating and changing dent S, as a rule, becomes the cause of the fluctuations and changes of the contact stress P in the gap between rollers 03 and causes the above-mentioned problems with the quality of ink transfer and ultimately the quality of printed products.

Figure 1 shows schematically the profile of the contact stress P in the clamping area between the rollers 01 and 02. Contact voltage R covers the entire touch area, arriving at the bus stop at the level of the connecting plane V axes of rotation maximum values of Rmax.

The latter is shifted during operation of the apparatus to the input side of the gap due to the viscous component of the force. In the projection on the normal to the connecting plane V plane e of the touch area and thereby the profile has a width C. the Maximum surface pressure Pmaxultimately responsible for the transfer of ink, so it should be set to the appropriate value.

In comparison with Figure 1, figure 2 schematically shows the profile of the contact stress P for the case of larger dents S, which simultaneously causes an increase in the width of the Century If you now need to change is required to get the maximum surface pressure P maxthe integration of the contact voltage R across In width will increase the force between the two rollers 01; 02.

The absolute level of contact stress P in the gap between rollers 03 and its oscillation when changing dents S, to a great extent is determined by the characteristic curve of elasticity applied layer 06, respectively applied deckle 05 with a layer 06. The characteristic curve of the elasticity represents the surface pressure P depending on dents S. figure 3 shows as an example some of the characteristic curves of elasticity of conventional deckles 05, in particular decline canvases 05 with the corresponding layer 06. The numerical values obtained in quasi-static test bench in the laboratory. They are suitable for transfer to the values defined in another way.

From Figure 3 it is seen that the rise ΔP/ΔS characteristic curve elasticity determines the oscillation pin voltage R when changing dents S (e.g., vibration). When variations ΔS dents about the average value of S dents value fluctuations ΔP the desired maximum contact stress Pmaxin the gap between rollers 03 around the average contact stress P is approximately proportional to the rise of ΔP/ΔS characteristic curve of elasticity at point S. Thus, for example, the deckle and 3) reducing dents S -0,16 to -0,14 mm affects the contact voltage R decrease its value by about 50 N/cm 2and reducing dents S -0,11 to -0,09 mm leads to a decrease contact stress P of about 25 N/cm2. Dekel b has a lower rise.

The deckles 05 as one or the layer 06 as such, having a big rise ΔR/ΔS, in particular, for the desired maximum contact stress Pmaxin poligraficheski current interval, in the following text referred to as "hard", and those with a low rise ΔR/ΔS as "soft".

So, Dekel 05, respectively, the layer 06, is as soft Dekel 05, respectively, as a soft layer 06. In comparison with hard Dekel 05, respectively, with a hard layer 06, the same relative movement of the rollers 01; 02 (thus changing the distance (A) results in the case of soft deckle 05 to a smaller voltage change of contact P and, consequently, to reduce fluctuations in the transfer of ink. Soft Dekel 05 causes thereby lower the sensitivity of the printing process to vibration and/or deviations of the distances from the setpoint. Due to a smaller change of the contact voltage R, due to the relative movements of the rollers 01; 02, for example, the vibrational bands in the printed products in the case of soft deckles, 05, or in the case of the deckles 05 with a soft layer of 06 are noticeable only at large oscillation amplitudes.

Contact voltage is agenie on pressure changes in a preferred embodiment, the maximum in the range from 60 to 220 N/cm 2. For liquids such as printing inks, with very different rheological properties can be preferred other intervals within the specified interval of the contact stresses. So, the interval of changes of contact stress for wet offset printing (colour and humidifier) is from 60 to 120 N/cm2in particular from 80 to 100 N/cm2, while for dry offset printing (no humidifier, only the paint on the plate cylinder, it is, for example, from 100 to 220 N/cm2preferably from 120 to 180 N/cm2. In particular, within these limits, the recovery is expected to fulfill the condition of ascent.

Poligraficheski actual spacing of the contact voltage of the Pmaxis preferably from 60 to 220 N/cm2. For liquids such as printing inks, with very different rheological properties can be preferred other intervals within the specified interval of the contact voltage. Thus, the interval for wet offset printing is, for example, from 60 to 120 N/cm2in particular from 80 to 100 N/cm2, while for dry offset printing it is, for example, from 100 to 220 N/cm2preferably from 120 to 180 N/cm2. In the preferred embodiment, soft Dekel 05 (or layer 06), at least in the range of from 80 to 100 N/cm2has the rise Δ R/ΔS, for example ΔR/ΔS<500 (N/cm2)/mm Rise ΔP/ΔS in the considered interval of the contact voltage of the P would have to be at least two times less than for deckles 05, usually currently used in offset printing.

In the preferred embodiment, as schematically shown in figure 2, the thickness t of the layer 06, accordingly, the total thickness T of the deckle 05 more than used hitherto thickness. The thickness t is effective against elasticity, respectively, the strain layer 06 is, for example, from 3.0 to 6.3 mm, in particular from 3.7 to 5.7 mm added To this, in some cases, the thickness of one or more, if necessary, connected to the layer 06, largely incompressible and inelastic layer facing the core 04 side, to ensure in terms of form and/or laseroptical connected with the layer 06 (not shown). This supporting layer 10 (or bearing layers 10), functionally efficient, not for "soft" deckle, but the shape may be located between the soft layers. This may be accomplished, for example, in the form of sheet metal, in particular sheet of stainless steel of a thickness of approximately 0.1 to 0.3 mm as a grid, depending on the performance of the deckle 05, he may have a thickness in the range from 0.1 to 0.6 mm, this thickness t of the layer 06 Rel is applicable in case of use of several single layers 06 (the sum of individual layers, functionally responsible for the provision of specified characteristics (dependence of the contact voltage from dents) and elasticity, respectively compressibility. Dekel 05 has, for example, together with the carrier layer (carrier layer) 10, the total thickness T in the range from 3.5 to 6.5 mm, in particular from 3.9 to 5.9 mm

"Soft" Dekel 05 (or layer 06) operated predominantly with a larger dent S in comparison with the usual dents S (shown schematically in figure 2 compared to Figure 1), i.e. both the roller 01; 02 are installed in working position closer to one another, counting on a effective, but not broken, the diameter DwGZDwPZ. In the result, despite lower rise ΔR/ΔS optimum maximum surface pressure Pmax. Install cylinder in operating position in the preferred execution is performed so that the dent S is at least 0.18 mm, for example from 0.18 to 0.60 mm, in particular from 0.25 to 0.50 mm

Relative dent S*, i.e. dent S, is related to the thickness t of the layer 06, ranges from 5%to 10%, in particular from 6 to 8%, excluding special design rollers 01; 02.

The resulting dents S layer 06 width In the contact zone of rollers in a projection perpendicular to the connecting plane V of their axes of rotation, is in the preferred embodiment, n is at least 5% of the undisturbed effective diameter DwGZroller 02 with a layer 06.

As described above, particularly preferred is performed, and/or the location of the "soft" deckle 05, when one of the two cooperating rollers 01; 02 (or even both) has on its effective lateral surface, at least one violation 09; 11 that affect the running rollers. This is a violation 09; 11 may be a gap 09; 11 in the form of running along the axis of the junction 09; 11 two ends of one or more of the deckles 05; 08. However, the violation 09; 11 may be formed, in particular, passing along the axis of the channel 09; 11 for fastening the ends of one or more of the deckles 05; 08. This channel 09; 11 is in the direction to the side surface of the opening through which skipped the ends. Inside channel 09; 11 may have a device for clamping and/or tightening deckle 05; 08, respectively deckles 05; 08.

When rolling the roller across the channel 09; 11, respectively, the channels 09; 11, oscillations are excited. If the width W; B11 channel 09; 11 in the circumferential direction greater than the width In the contact zone when the passage channel 09; 11 is excited wave with greater amplitude, so as to cause the above-mentioned greater width In the contact zone has a large linear force between two platens 01; 02. And yet the growth of the amplitudes of the oscillations under more linear power supplies which is less than to reduce the sensitivity to fluctuations due to the softness of the layer 06, so that the total result is the reduced sensitivity to vibration.

A special advantage lies in the fact that the width W; B11 channel 09; 11 selected smaller than the width In the contact zone. In this case, at least, always lots of interacting side surfaces of the touch area rely on each other, resulting in further weakened the power of the excitation beats and curve vibration goes more smoothly (extension of the pulse). Softer deckles 05, respectively softer layers 06, lead thereby narrow channels 09; 11 to a weakening of the channel beats and more prolonged course of time.

In the transfer cylinder 02 the ends of the metal decalogo the fabric can be tucked into the channel 11. The layer 06 in this case applied on a dimensionally stable carrier, for example a thin metal plate (sheet metal), bent edges which are located in the channel 11. The channel 11 can be made extremely narrow in the circumferential direction, for example, it may be less than or equal to 5 mm, in particular less than or equal to 3 mm in the case of the plate cylinder 01 channel 09 executed with the size in the circumferential direction, is less than or equal to 5 mm, in particular less than or equal to 3 mm.

On the contrary, large in comparison with ordinary the mi units touch area (width of print) reduces the allowable ratio V In, accordingly B11 to Century

Particularly advantageous is an embodiment in which the width W;

B11 channel 09; 11 in the area of the hole or mouth on the side surface of the core 04, respectively, the initial body roll 07 in the circumferential direction, is in respect of at least 1: 3 to the resulting compression cylinder width In the contact zone (strip of print).

Soft layer 06 has in comparison with commonly used materials lower constant attenuation, so that despite the higher loading rate and razrusheniya due to deeper dent S when running, to avoid the formation of substantial heat collapse. The layer 06 should also be designed so that the recovery was fast enough, respectively, the elastic return to its original position after passing through the gap between rollers 03 was fast enough so that, for example, by contact with colourful roller or other cylinder original thickness would have been restored.

Figure 4 and 5 shows the printing unit 12, optimally configured with a layer of 06 and made in the form of so-called double printing apparatus. Coupled with the plate cylinder 01 of the transfer cylinder 02 of the first cylinder pair 01; 02 communicates through printed material 13, such as a canvas 13, cyl is ndram 14 backpressure, also made in the form of the transfer cylinder 14, which also carries the plate cylinder 16. All four cylinders 01; 02; 14; 16 rotate from a variety of drive motors are mechanically independent from each other (Figure 4). In a modified embodiment, the plate and transfer cylinders 01; 02; 14; 16 are connected in pairs and are rotated each pair of the driving motor 17 (on the plate cylinder 01; 16, the transfer cylinder 02; 14 or parallel) (Figure 5).

The plate cylinder 01; 16 and the transfer cylinder 02; 14 in the first embodiment is executed in the form of cylinders 01; 02; 14; 16 double-coverage, i.e. coverage, corresponding to the two vertical printed pages, in particular two newspaper strips. Each of them has an effective diameter of DwGZ; DwPZin the range from 260 to 400 mm, in particular from 280 to 350 mm On the lateral surface of the core 04 each transfer cylinder 02; 14) has at least one Dekel 05 total thickness T in the range from 3.5 to 6.5 mm, in particular from 3.9 to 5.9 mm Rise ΔP/ΔS characteristic curve of elasticity, at least in poligraficheski current interval (see above) lies below 700 (N/cm2)/mm, in particular less than 500 (N/cm2)/mm Plate and transfer cylinders 01; 02; 14; 16 installed in pairs to one another so that the width In the contact zone between the plate and transfer cylinders 01;02; 14; 16 in the installation position varies from 14 to 25 mm, in particular from 17 to 21 mm Due to this configuration, the sensitivity to vibration and poor installation is almost minimized. Individual drive of each cylinder from the respective drive motors 17 further reduces sensitivity to vibration due to the mechanical decoupling.

In the second, not shown embodiment, the plate cylinder 01; 16 and the transfer cylinders 02; 14 is in the form of cylinders 01; 02; 14; 16 simple coverage, i.e. coverage mainly in one vertical printed page, in particular one newspaper page. Each of them has an effective diameter of DwGZ; DwPZin the range from 150 to 190 mm On the lateral surface of the core 04 each transfer cylinder 02; 14) has at least one Dekel 05 total thickness T in the range from 3.5 to 6.5 mm, in particular from 3.9 to 5.9 mm Rise ΔR/ΔS characteristic curve of elasticity, at least in poligraficheski current interval (see above) lies below 700 (N/cm2)/mm, in particular less than 500 (N/cm2)/mm Plate and transfer cylinders 01; 02; 14; 16 installed in pairs to one another so that the width In the contact zone between the plate and transfer cylinders 01; 02; 14; 16 in the installation position varies from 10 to 18 mm, in particular from 12 to 15 mm.

In the third not shown in the Rianta run the plate cylinders 01; 16 in the form of cylinders 01; 16 simple coverage with effective diameters of DwPZin the range from 150 to 190 mm, and the transfer cylinders 02; 14 is in the form of cylinders of double coverage with effective diameters of DwGZin the range from 260 to 400 mm, in particular from 280 to 350 mm On the lateral surface of the core 04 each transfer cylinder 02; 14) has at least one Dekel 05 total thickness T in the range from 3.5 to 6.5 mm, in particular from 3.9 to 5.9 mm Rise ΔR/ΔS characteristic curve of elasticity, at least in poligraficheski current interval (see above) lies below 700 (N/cm2)/mm, in particular less than 500 (N/cm2)/mm Plate and transfer cylinders 01; 02; 14; 16 installed in pairs to one another so that the width In the contact zone between the plate and transfer cylinders 01; 02; 14; 16 in the installation position varies from 12 to 20 mm, in particular from 15 to 19 mm

Figure 6 and 7 shows the printing section 19, which is operated either as part of a larger printing unit, for example, five-cylinder, deletecontrol or distillatively printing unit, or as a three-cylinder printing unit 19. The transfer cylinder 02 communicates with the cylinder 18, not transferring printing ink, for example with the cylinder 18 of the back pressure, as, for example, a planetary cylinder 18. "Soft" side surface of puredata the aqueous cylinder 02 in this case interacts with the "hard" side surface of the plate cylinder 01 on one side and hard side surfaces of the planetary cylinder 18 on the other side. In an embodiment (6) with at least independent from each other given the transfer cylinder 02 and the planetary cylinder 18 and one or more planetary cylinder 18 has its own drive motor 17, while the steam from the plate and transfer cylinders 01; 02 is mechanically connected to a common drive motor (6), or each of the cylinders of the pair is driven mechanically independently of each its own drive motor 17 (Fig.7).

The plate cylinder 01, the transfer cylinder 02 and the planetary cylinder 18 in the first embodiment is executed in the form of cylinders 01; 02; 18 double coverage with effective diameters of DwGZ; DwPZ; DwSZin the range from 260 to 400 mm, in particular from 280 to 350 mm On the lateral surface of the core 04 each transfer cylinder 02; 11 has at least one Dekel 05 total thickness T in the range from 3.5 to 6.5 mm, in particular from 3.9 to 5.9 mm Rise ΔR/ΔS characteristic curve of elasticity, at least in poligraficheski current interval (see above) lies below 700 (N/cm2)/mm, in particular less than 500 (N/cm2)/mm Plate and transfer cylinders 01; 02, and the transfer cylinder 02 and the planetary cylinder 18 installed in pairs respectively to one another so that the width In the contact zone in the installation position varies from 14 to 25 mm, the particular from 17 to 21 mm

In the second embodiment, for 6 or 7 of the plate cylinder 01, the transfer cylinder 02 and the planetary cylinder 18 is made in the form of cylinders 01; 02; 18 simple coverage, i.e. coverage mainly in one vertical printed page, in particular one newspaper page.

Each of them has an effective diameter of DwGZ; DwPZ; DwSZin the range from 120 to 180 mm, in particular from 130 to 170 mm On the lateral surface of the core 04 each transfer cylinder 02; 11 has at least one Dekel 05 total thickness T in the range from 3.5 to 6.5 mm, in particular from 3.9 to 5.9 mm Rise ΔR/ΔS characteristic curve of elasticity, at least in poligraficheski current interval (see above) lies below 700 (N/cm2)/mm, in particular less than 500 (N/cm2)/mm Plate and transfer cylinders 01; 02, and the transfer cylinder 02 and the planetary cylinder 18 installed in pairs respectively to one another so that the width In the contact zone in the installation position varies from 10 to 18 mm, in particular from 12 to 15 mm.

Along with the above must be considered when developing the concept of the printing machine due to the greater mildness of the changes (deeper dent's changed the character scan the circumference of the cylinder, the large thickness t, respectively T). Printing machine, working with soft and thicker declama, accordingly layers 06, has, therefore, changed, in particular increased undercuts cylinders (scan, the thickness of the canvas), and also changed the size of the gap when installing the cylinder in the working position, respectively, the output from the working position (the thickness of a cloth, dent). For this purpose also requires large actuating the path to move the cylinder in the disconnected position of the pressure (the deeper the dent).

The above Dekel 05, respectively, the layer 06 is located in the printing apparatus with one or more long, small diameter, cylinders 01; 02; 14; 16.

Thus, the plate cylinder 01; 16 and the transfer cylinder 02; 14 have, for example, the length of the barrel (hereinafter - "the length of the working part of the cylinder"), corresponding to four or more widths of a printed page, for example page of a newspaper, for example, from 1100 to 1800 mm, in particular from 1500 to 1700 mm Diameter DwGZ; DwPZat least the plate cylinder 01; 16 is, for example, from 145 to 190 mm, in particular from 150 to 185 mm, what coverage mainly corresponds to the length of a page of a newspaper ("easy reach"). However, the device can be successfully used for other applications in which the ratio between the diameter and length of the cylinders 01; 02; 14; 16 is less than or equal to 0.16, in particular less than 0.12, or even less than or equal to 0.08.

In another version printed up the Arata length of the working part of the plate and transfer cylinders 01; 02; 14; 16 is, for example, from 1850 to 2400 mm, in particular from 1900 to 2300 mm, these dimensions allow to be placed in axial direction next to each other, for example, at least six vertical printed pages, large format. At least the plate cylinder 01; 16 in one embodiment with a diameter ranging, for example, from 260 to 340 mm, in particular from 280 to 300 mm, and in another embodiment within, for example, from 290 to 380 mm, in particular from 300 to 370 mm, that coverage is basically two lengths of newspaper strips ("double coverage"). The ratio of the diameter DwGZ; DwPZat least the plate cylinder 01; 16 to its length is in the range from 0.11 to 0.17, in particular from 0.13 to 0.16.

The list of items

01 roller, cylinder, plate cylinder, the cylinder back pressure

02 roller, cylinder, transfer cylinder

03 the gap between the rollers, the point raceway

04 core

05 Dekel, tire, decline canvas

06 layer

07 initial body rolling

08 Dekel, print the form

09 the breach channel

10 supporting layer

11 violation, channel

12 printing unit, double printing apparatus

13 printed material, canvas

14 roller, cylinder, transfer cylinder, the cylinder back pressure

15 -

16 roller, cylinder, plate cylinder

17 drive motor

18 roller, cylinder, Zilin the p back pressure, the planetary cylinder,

19 printing unit, three-cylinder printing unit

and Dekel

And the axial distance

b Dekel

In width, the area of touch

W width

B11 width

DwGZdiameter

DwPZdiameter

DwSZdiameter

E plane

R pin voltage

Pmaxcontact voltage, maximum

t thickness (06)

T total thickness (05)

S dent

S* dent, relative

V connecting plane

1. Dekel on the side surface of the roller (02; 14)having elastic and/or compressible layer (06) with dependent dents (S) contact stress (P), characterized in that the dependence of the contact voltage (P) layer (06) from dents (S) is such that its lift (ΔP/ΔS), at least in the operational range of the contact stress of 100 N/cm2is less than 700 N/cm2)/mm

2. Dekel on the side surface of the transfer cylinder (02; 14) the offset printing apparatus having the elastic and/or compressible layer (06) with dependent dents (S) contact stress (P), characterized in that the dependence of the contact voltage (P) layer (06) from dents (S) is such that its lift (ΔR/ΔS), at least in the interval dents from 0.22 to 0.38 mm is less than 700 N/cm2)/mm

3. Dekel according to claim 1, characterized in that in addition to the above lifting (#x00394; P/ΔS) less than 700 N/cm2)/mm at a contact stress of 100 N/cm2rise ((ΔP/ΔS) when using deckle for wet offset printing, i.e. when using paint and humidifier, at least over the entire operating range of the contact voltage from 80 to 100 N/cm2is less than 700 N/cm2)/mm

4. Dekel according to claim 1, characterized in that in addition to the above lifting (ΔR/ΔS) less than 700 N/cm2)/mm at a contact stress of 100 N/cm2rise (ΔR/ΔS) when using deckle for dry offset printing, i.e. using only paint without the humidifier, at least over the entire operating range of the contact voltage from 120 to 180 N/cm2is less than 700 N/cm2)/mm

5. Dekel according to claim 1, characterized in that the thickness (t) of the layer (06) is at least a 3.0 mm

6. Dekel according to claim 1, characterized in that it is made in the form of removable deckle (05).

7. Dekel according to claim 6, characterized in that it is along with a layer (06) is firmly connected with it mainly dimensionally stable supporting layer (10).

8. Dekel according to claim 6 or 7, characterized in that its total thickness (T) is at least a 3.5 mm

9. Dekel according to claim 1 or 2, characterized in that the layer (06) cushion (02; 14) installed with the opportunity to interact during operation, performed as a blade (13) sapec Taamim material (13).

10. Dekel according to claim 1 or 2, characterized in that it is made as a metal decalogo canvas.

11. Dekel according to claim 1 or 2, characterized in that the metal decline canvas equipped with size-resistant layer is a carrier made of metal, in particular sheet steel.

12. Dekel according to claim 1 or 2, characterized in that it is placed in the printing apparatus of the printing machine, printer printed pages in newspaper format, in particular a newspaper printing machine.

13. Printing apparatus a printing machine with at least two interacting in the installation position of the rollers(01; 02; 14; 16; 18), one of the rollers(01; 02; 14; 16; 18) made in the form of the transfer cylinder (02; 14), which is in the area of its lateral surface has an elastic and/or compressible layer (06), characterized in that the transfer cylinder (02; 14) and another roller (01; 16; 18) in mounting position is located in relation to one another so that the resulting dents (S) layer (06) width (In) the contact zone between the two rollers (01; 02) in the direction perpendicular to the connecting plane (V) their axes of rotation in the gap (03) between the rollers is at least 10 mm and the touch area is at least 5% of the undisturbed effective diameter (DwGz) roller (02) with the layer (06).

14. Printing apparatus according to item 13, wherein the touch area (In has a width, at least 12 mm

15. Printing apparatus according to item 13, characterized in that the layer (06), at least in the range of surface pressures from 80 to 100 N/cm2has the rise (ΔR/ΔS) less than 700 N/cm2)/mm

16. Printing apparatus according to item 13, characterized in that the layer (06) made in the form of deckle according to one or more of claims 1 to 12 claims.

17. Printing apparatus according to item 13, wherein the width of the resulting dents (S) layer (06) the contact zone between the two rollers (01; 02) in the gap (03) between them when viewed in the direction perpendicular to the connecting plane (V) their axes of rotation is greater than the width (W B11) channel (09; 11) interactive roller (01; 16) in the area of its outlet to the side surface in the circumferential direction.

18. Printing apparatus according to item 13, characterized in that the layer (06) cushion (02; 14) installed with the opportunity to interact during operation, performed as a blade (13) of the printed material (13).

19. Printing apparatus a printing machine with at least two interacting in the installation position of the rollers(01; 02; 14; 16; 18), one of the rollers(01; 02; 14; 16; 18) made in the form of the transfer cylinder (02; 14), which is in the area of its lateral surface has an elastic and/or compressible layer (06), characterized in that the transfer cylinder (02; 14) the other roller (01; 16; 18) in mounting position is located with respect to one another so that the dent (S) layer (06), produced mainly incompressible and inelastic lateral surface of the other roller (01; 16; 18) in the gap (03) between the rollers is at least 0,18 mm

20. Printing apparatus according to claim 19, characterized in that the dent is from 0.25 to 0.50 mm

21. Printing apparatus according to claim 19, characterized in that the resulting dents (S) layer (06) touch area between the two rollers (01; 02) has a width (In) in the direction perpendicular to the connecting plane (V) their axes of rotation in the gap (03) between rollers, at least 10 mm

22. Printing apparatus according to claim 19, characterized in that cooperating with the transfer cylinder (02; 14) roller (01; 16) made in the form of the plate cylinder (01; 16).

23. Printing apparatus according to claim 19, characterized in that cooperating with the transfer cylinder (02; 14) roller (18) is designed as a planetary cylinder (18).

24. Printing apparatus according to claim 19, characterized in that at least one of the two rollers (01; 02; 14; 16) has on its side surface, at least one violation (09; 11)influencing the test.

25. Printing apparatus according to paragraph 24, wherein the violation (09; 11) caused by a hole passing axially channel (09; 11) for fastening the ends of one or more of the deckles (05; 08).

26. Printing apparatus according to item 21 and 25, characterized in that the ratio of the width (W; B11) channel (09; 11) in the area of the hole on the side surface in the circumferential direction to the width (In) the contact zone is a maximum of 1:3.

27. Printing apparatus according A.25, characterized in that the width (W; B11) channel (09; 11) in the area of the hole on the side surface in the circumferential direction is a maximum of 5 mm

28. Printing apparatus according to item 22, wherein the plate and transfer cylinders (01; 02; 14; 16) are rotated mechanically connected to a common drive motor (17).

29. Printing apparatus according p, characterized in that the plate and transfer cylinders (01; 02; 14; 16) are rotated as a cylinder, a pair of mechanically independent from one or more other cylinder pairs (01; 02; 14; 16) or planetary cylinder (18).

30. Printing apparatus according to item 22, wherein the plate and transfer cylinders (01; 02; 14; 16) are rotated, each from its own drive motor (17) is mechanically independent from each other.

31. Printing apparatus according to item 23 or 29, characterized in that the planetary cylinder (18) has its own drive motor (17), mechanically independent from the other cylinders(01; 02; 14; 16).

32. Printing apparatus according to claim 19, characterized in that at least the transfer cylinder (02; 14) has coverage, correspond to the s basically two vertical printed pages in newspaper format.

33. Printing apparatus according p, characterized in that each roller(01; 02; 14; 16; 18) is the length of the working part, corresponding to the six widths of a printed page in a newspaper format.

34. Printing apparatus according to item 22, wherein at least the plate cylinder (01; 16) has a coverage corresponding generally in one vertical printed page in a newspaper format.

35. Printing apparatus according p or 34, characterized in that each roller(01; 02; 14; 16; 18) is the length of the working part corresponding to four widths of a printed page in a newspaper format.

36. Printing apparatus according to item 22, wherein the ratio between the effective diameter and a length of at least the plate cylinder (01; 16) is less than or equal to 0.16.

37. Printing apparatus according to claim 19, characterized in that it is made in a printing apparatus for wet offset printing and the dependence of the surface tension (R) from dents (S), at least in the range of from 80 to 100 N/cm2has the rise (ΔP/ΔS) less than 700 N/cm2)/mm

38. Printing apparatus according to claim 19, characterized in that it is made in a printing apparatus for dry offset printing and the dependence of the surface tension (R) from dents (S), at least in the range of from 120 to 180 N/cm2has the rise (ΔP/ΔS) less than 700 N/cm2)/mm

39. Printing apparatus according to claim 19, characterized in that both of the roller 01; 02; 14; 16; 18) in mounting position is located in relation to one another in accordance with the location indicated in paragraph 13 of the claims.

40. Printing apparatus according to claim 19, characterized in that the layer (06) made in the form of deckle according to one or more of claims 1 to 12 claims.

41. Printing apparatus according to claim 19, characterized in that the width of the resulting dents (S) layer (06) the contact zone between the two rollers (01; 02) in the gap (03) between them when viewed in the direction perpendicular to the connecting plane (V) their axes of rotation is greater than the width (W B11) channel (09; 11) interactive roller (01; 16) in the area of its outlet to the side surface in the circumferential direction.

42. Printing apparatus according to claim 19, characterized in that the layer (06) cushion (02; 14) installed with the opportunity to interact during operation, performed as a blade (13) of the printed material (13).

43. Printing apparatus with at least two interacting in the installation position of the rollers(01; 02; 14; 16; 18), moreover, at least one of the rollers(01; 02; 14; 16; 18) has in the area of its lateral surface, at least one hole passing axially channel (09; 11) for fixing at least one end of one or more of the deckles (05; 08) and one of the rollers(01; 02; 14; 16; 18) has in the area of its lateral surface is STI elastic and/or compressible layer (06), moreover, in the installation position in the dent (S) layer (06) formed the touch area between the two rollers (01; 02) with the resulting width (In) in the direction perpendicular to the connecting plane (V) their axes of rotation, characterized in that the ratio of the width (W; B11) channel (09; 11) in the area of the hole on the side surface in the circumferential direction to the width (In) the contact zone is a maximum of 1:3.

44. Printing apparatus according to item 43, wherein the layer (06) made in the form of deckle according to one or more of claims 1 to 12 claims.

45. Printing apparatus according to item 43, wherein the width of the resulting dents (S) layer (06) the contact zone between the two rollers (01; 02) in the gap (03) between them when viewed in the direction perpendicular to the connecting plane (V) their axes of rotation is greater than the width (W B11) channel (09; 11) interactive roller (01:16) in the area of its outlet to the side surface in the circumferential direction.

46. Printing apparatus according to item 43, characterized in that the layer (06) cushion (02; 14) installed with the opportunity to interact during operation, performed as a blade (13) of the printed material (13).



 

Same patents:

The invention relates to offset printing, and more particularly, to a compressible offset printing canvas, and to methods for their manufacture for use in offset printing machines

FIELD: tympan of vibrating roller, printing apparatuses of printing machine.

SUBSTANCE: tympan on lateral surface of roller, for example roller of printing apparatus has elastic and(or) compressible layer whose contact stress P depends upon value of depression. Said layer is formed in such a way that to provide relationship of contact stress from depression value grown up to 700 N/cm2 at least in separate zones.

EFFECT: possibility for providing by simple means high quality of printed products due to lowered response to vibration and to distortion of printing process.

46 cl, 8 dwg

FIELD: printing.

SUBSTANCE: invention relates to offset cylinder and method of its production, as well as to the gravure machine. The gravure machine comprises a plate cylinder with printing plates with deep-gravure printing elements corresponding to gravure printing structure to be printed on the base, the gravure cylinder interacting with the printing cylinder. The offset cylinder incorporates, at least, one offset blanket whereon multi-colour ink is rolled by means of selector cylinders. A preset colour ink is applied onto every selector cylinder, the ink being fed from the ink device coupled thereto. Note, that every selector cylinder has recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour. Note here, that, at least one said offset blanket contains, at least, lipophilic surface layer with recesses or lipophobic surface layer with recesses, including sections with and without recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour.

EFFECT: higher accuracy of the ink application, optimised consumption of the ink.

6 cl, 7 dwg

FIELD: printing.

SUBSTANCE: gasket for offset cylinder of printing machines contains at least one inelastic polyester-based layer and at least one polyurethane elastomeric layer. The said layers are connected inseparably together. The polyurethane elastomeric component has certain chemical/physical characteristics.

EFFECT: ecological compatibility; antipyrine properties; resistance to solvents and mechanical stress; good machinability by mechanical means; durability; significant degree of universality use; good modifiability of the cylinder and elastic flexibility; improved constructional configuration of the printing contact zone; significant degree of uniformity of the image elements spreading on the raster and improved printing stability.

5 cl, 3 dwg

FIELD: printing industry.

SUBSTANCE: frame of print blanket includes substrate, compressible layer and upper textile bundle. Substrate of textile bundle comprises at least one textile layer. Each layer has multiple fibres or threads of warp and woof. Compressible layer includes moisture-hardened thermosetting polymer in the form of polyurethane, urea resin or their mixture. Compressible layer contains multiple evenly distributed closed cells and has uniform characteristics of compression. Compressible layer is applied over substrate. Upper textile bundle comprises at least one textile layer. Each layer has multiple fibres or threads of warp and woof. Textile bundle is applied over compressible layer. Method has also been proposed for manufacturing of compressible frame of print blanket.

EFFECT: invention makes it possible to reduce time for preparation and hardening of print blanket.

13 cl, 1 dwg, 8 tbl, 4 ex

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