Mechanism of transportation of fabric of sewing machine

FIELD: textiles, paper.

SUBSTANCE: mechanism of transportation of fabric of sewing machine comprises a mechanism of horizontal movement of the rack bar kinematically connected to the main shaft of the machine. At that the mechanism of horizontal movement of the rack bar is made in the form of the drum comprising a toothed-pinion belt put on the spools and the pinions, at that the spools are located one horizontal plane, one of the spools is installed on the driven shaft, and the pinions are located on both sides of the horizontal plane of the spools location to form a polygon; the spools are connected with a clamp connected via the lever to the handle mounted with the ability of fixation; and on the toothed-pinion belt the toothed elements are placed in the form of tracks, corresponding to the lines with different pitches. At that the toothed elements are made composite and can be manufactured, for example, from textolite.

EFFECT: improvement of the mechanism.

2 cl, 6 dwg

 

The unit refers to the garment industry and can be used on a universal high-load and high-speed sewing machines.

A well-known mechanism of the sewing machine (U.S. Pat. 2281352 Russian Federation, IPC 7 D05B 27/02. The mechanism of the engine of fabric sewing machine (2 versions) / Mazin PS, Markovets AV, Fishlow A.R., kicking A.B.; applicant and patentee: State educational institution of higher professional education "Saint-Petersburg state University of technology and design". No. 2004137596/12; Appl. 22.12.2004; publ. 27.09.2006), containing the mechanism for transporting the fabric to ensure the movement of the rack above the needle plate on a trajectory having straight parallel to the needle plate area, during transportation the fabric to a predetermined and adjustable stitch length. This is accomplished by using in the kinematic chain moves the rack vertically six-bar linkage to dwell rocker rise in the extreme upper position of the rack.

The disadvantage of the invention is the use of complex six-bar mechanism, which reduces the stiffness of the system, reliability, durability, number of degrees of freedom and the possibility of dismantling separate the produced elements.

For the prototype PR is adopted mechanism of the engine of fabric sewing machine (U.S. Pat. 2241794 Russian Federation, IPC 7 D05B 27/02. The mechanism of the engine tissue / Umarov R.K., Komarenko GA, Zakharov A.V., Nikitin VA, Trantina T.N., Caplin V.M., VA carts; applicant and patent owner: limited liability Company "Factory of household sewing machines". No. 2003124364/12; Appl. 07.08.2003; publ. 10.12.2004), where the mechanism of the engine of tissue containing the mechanism for horizontal movement of the rack, including fixed on the main shaft trehtsentrovye Cam, kinematically connected through the rear rocker shaft with promotion, with support respectively for pivotally installing it on the Shuttle shaft and to the axis of the swing arm rack, made in the front of the rocker, and the mechanism for vertical movement of the rack, kinematically associated with the Shuttle mechanism, comprising a casing stroke of the Shuttle, which has a Shuttle shaft and a fixed axis, the bearing mechanism of the motor dropship, having a bevel gear transmission, consisting of a conical toothed sector fixed on the Shuttle shaft, and bevel gears with hub loosely mounted on a fixed axis and carrying rigidly fixed to the engine of the Shuttle and the means of raising the rack, kinematically connected with the lever rack. The shaft of the progress made teams, consisting of common ground, and eat what's supports, secured in the base by means of clamps, with removable supports for installing it on the Shuttle shaft made in the form of spherical bushings, and a removable bearing for the axis of swing is executed in the form of two rigidly connected cylindrical bushings, and the fixing of removable supports with clamps carried out after checking the lightness axis of the swing shaft and promotion to the Shuttle shaft, and the kinematic connection of the shaft of promotion with plates of three-centered Cam includes an eccentric axis fixed in the rear arm, and the means of ascent is made in the form of a Cam interacting with the pusher rack attached with adjustable height lever on the rack.

The disadvantage of the prototype is the classical trajectory of the rack, resulting in the formation landing stitched materials; use the Cam as a means of lifting and the use of eccentric axes, leading to dynamic loads and increased friction of the contacting elements, which affects the durability, in addition, the device is heavy and relatively expensive material.

The technical result of the invention is to provide stable operation of the machine when the change in the mechanism of adjustment of stitch length and, as a result, improving quality is a product with a simultaneous increase stability at high speeds and variable loads, as well as low noise, no vibration, corrosion resistance and low coefficient of friction.

This technical result is achieved by the fact that in the mechanism of transportation of fabric sewing machine containing the mechanism for horizontal movement of the rack, kinematically connected to the main shaft of the machine according to the invention, the mechanism for horizontal movement of the rack is made in the form of a drum, comprising a toothed rack and pinion belt, put on the spool and gear, and the bobbin thread are in the same horizontal plane, one mounted on the driven shaft and gear are arranged on both sides of the horizontal placement of the bobbins with the formation of the polygon, while the bobbins are connected by a yoke connected through a lever arm that is installed with the possibility commit; and rack - and-pinion belt posted by toothed elements in tracks corresponding to lines with different steps, this toothed elements made of composite.

The technical result is achieved due to the movement of the drum at a constant height lifting his gear elements, i.e. at a constant geometry of the mechanism compared to the prototype and similar mechanisms, are widely used in the production, which positively skazyvaetsya clutch fabric with toothed elements and, as a consequence, the quality of the products. Damping of vibrations and stability is achieved through the use of rack - and-pinion belt and a belt transmission in the inventive device, as well as the lungs of polymeric materials, excluding the moments of inertia.

Figure 1 shows the spatial kinematic diagram of the inventive device (dimetric);

figure 2 shows the drum mechanism transporting fabric sewing machine, a top view; figure 3 is the same, right side view; figure 4 is a top view; figure 5 is the same as in ISO; figure 6 shows a diagram of the location of the timing element.

The device (1) contains the pulley, the wheel 1 is fixed on the main shaft 2 coaxially mounted gear wheel 3. At last worn timing belt 4, connecting the main shaft 2 to the driven shaft 5 through a gear wheel 6. At the other end of the shaft 5 through a splined connection 7 leading the bobbin 8 in contact with the tooth rack belt 9 and directly through it - driven bobbin 10, lying in the same horizontal plane with the lead 8, and mounted on the axle 11 and the gear wheels 12, 13, 14, 15 mounted on the axis 16, 17, 18 and 19 respectively located on both sides of the horizontal plane. The location of the shaft 5 and the axes 11, 16, 17, 18 and 19 forms a polygon. Cylindrical working surfaces of spools 8 and 10 are made with teeth. This toothed surfaces of the bobbins 8 and 10, and the gear wheels 12, 13, 14 and 15 are made of the same profile with the same step. In the grooves of the led 10 and the leading 8 bobbins inserted the clamp 20 is connected through the lever 21 with a handle 22 that contains the influx 23 and the spring 24. The other end of the lever 21 is connected with the peg 25. The bobbin 8 and 10, the gears 12, 13, 14 and 15 comprises a gear rack and pinion belt 9 is made of polyurethane or rubber. Metal gear elements 26 are placed on the working surface of the tooth rack belt 9 in the form of tracks corresponding to lines with different step. The mechanism works as follows:

Pulley-flywheel 1, the receiving the main motion from the engine or operator, rigidly mounted on the main shaft 2 coaxially pressed toothed wheel 3 through the timing belt 4 transmits the motion to the follower shaft 5 is rigidly fixed on the wheel 6. Through the splined connection 7, the shaft 5 transmits the movement of the leading bobbin 8, through which receives a toothed rack and pinion belt 9 and in contact with him led the bobbin 10, a freely rotating on a fixed axis 11. Gears 12, 13, 14 and 15, to freely rotate about a fixed axis 16, 17, 18 and 19. When moving the handle 22 is fixed due to the presence of notches in the housing, the influx 23 and springs 24, resting in the housing, moves the drum I, directly cher the C lever 21, freely mounted in the handle 22 with one hand, and mounted with a possibility of rotation around the axis of the peg 25 on the opposite side. The handle 23 at the same time moves the clamp 22 is inserted into it freely rotating slave and master the bobbins 10 and 8 along the axis 11 and the shaft 5. Together with spools 8 and 10 are moved gears 12, 13, 14, 15, and accordingly the gear - rack and pinion belt 9. Moreover, the number of incisions made on the body, corresponds to the number of tracks of the timing elements of the rack - and-pinion belt 9. The dimensions of the gear elements 26 of the belt 9 correspond to the desired width of a stitch.

1. The mechanism of transportation of fabric sewing machine containing the mechanism for horizontal movement of the rack, kinematically connected to the main shaft of the machine, characterized in that the mechanism for horizontal movement of the rack is made in the form of a drum, comprising a toothed rack and pinion belt, put on the spool and gear, and the bobbin thread are in the same horizontal plane, one of the bobbins mounted on the driven shaft and gear are located on both sides of the horizontal placement of the bobbins with the formation of the polygon, while the bobbins are connected by a yoke connected through a lever arm that is installed with the possibility of fixation, and the rack-and-pinion the strap placement is updatye elements in tracks, the relevant lines with different steps, this toothed elements made of composite.

2. The mechanism of transportation of fabric sewing machine according to claim 1, characterized in that the elements of the drum can be manufactured, for example, of the PCB.



 

Same patents:

FIELD: textiles, paper.

SUBSTANCE: mechanism of transportation of fabric of sewing machine comprises a kinematic chain of movements of the rack bar, comprising the system of rods and levers, at that on the main shaft the profile cam is mounted which is connected with the toothed plate kinematically connected through the shaft-rocker and the lever with the rack bar, and the profile cam is made sine-shaped. The connection of the toothed plate with the shaft-rocker is made of a gear wheel engaged with the toothed plate, at that the gear wheel is mounted coaxially with the bevel gear, which is in contact with the shaft, at the end of which a similar bevel gear is located through the train of gears connected with the shaft-rocker. The mechanism enables to increase the wear-resistance and reliability of operation under high dynamic loads.

EFFECT: mechanism is universal and can be used for a wide range of sewing machines.

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FIELD: sewing engineering, in particular, rack-type fabric conveying mechanism preferably for low-speed highly loaded sewing machines.

SUBSTANCE: fabric conveying mechanism has kinematic chain for moving toothed rack in vertical plane. Kinematic mechanism uses six-link pivotal mechanism providing standing of lifting arm in extreme upper position of toothed rack and simplified joining of supporting lever with connecting rods of six-link kinematic chain for moving toothed rack in vertical plane and changing connection of lifting arm with lever, which carries toothed rack. Fabric conveying mechanism of such construction provides movement of toothed rack above needle plate along path having straight portion extending in parallel with needle plate during conveyance of fabric by predetermined and regulated length of stitch.

EFFECT: simplified construction, improved quality of conveying fabric on low-speed highly loaded sewing machine, and enhanced reliability in operation of fabric conveying mechanism.

3 cl, 3 dwg

FIELD: sewing.

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EFFECT: enhanced efficiency and reliability.

2 cl, 2 dwg

The invention relates to sewing machines and more particularly to mechanisms of the engine fabric with vertical and horizontal mechanisms for moving the rack, the first made in the form of spatial four-link mechanisms and providing in conjunction with horizontal mechanisms for moving the rack according to the classical scheme (trajectory): the rise, progress over the needle plate (promotion material), lowering, advancing under the needle plate, lifting

FIELD: sewing.

SUBSTANCE: mechanism comprises needle rack that moves above the needle plate and kinematic member for transporting gear rack over the vertical of the six-link pivoting mechanism.

EFFECT: enhanced efficiency and reliability.

2 cl, 2 dwg

FIELD: sewing engineering, in particular, rack-type fabric conveying mechanism preferably for low-speed highly loaded sewing machines.

SUBSTANCE: fabric conveying mechanism has kinematic chain for moving toothed rack in vertical plane. Kinematic mechanism uses six-link pivotal mechanism providing standing of lifting arm in extreme upper position of toothed rack and simplified joining of supporting lever with connecting rods of six-link kinematic chain for moving toothed rack in vertical plane and changing connection of lifting arm with lever, which carries toothed rack. Fabric conveying mechanism of such construction provides movement of toothed rack above needle plate along path having straight portion extending in parallel with needle plate during conveyance of fabric by predetermined and regulated length of stitch.

EFFECT: simplified construction, improved quality of conveying fabric on low-speed highly loaded sewing machine, and enhanced reliability in operation of fabric conveying mechanism.

3 cl, 3 dwg

FIELD: textiles, paper.

SUBSTANCE: mechanism of transportation of fabric of sewing machine comprises a kinematic chain of movements of the rack bar, comprising the system of rods and levers, at that on the main shaft the profile cam is mounted which is connected with the toothed plate kinematically connected through the shaft-rocker and the lever with the rack bar, and the profile cam is made sine-shaped. The connection of the toothed plate with the shaft-rocker is made of a gear wheel engaged with the toothed plate, at that the gear wheel is mounted coaxially with the bevel gear, which is in contact with the shaft, at the end of which a similar bevel gear is located through the train of gears connected with the shaft-rocker. The mechanism enables to increase the wear-resistance and reliability of operation under high dynamic loads.

EFFECT: mechanism is universal and can be used for a wide range of sewing machines.

2 cl, 3 dwg

FIELD: textiles, paper.

SUBSTANCE: mechanism of transportation of fabric of sewing machine comprises a mechanism of horizontal movement of the rack bar kinematically connected to the main shaft of the machine. At that the mechanism of horizontal movement of the rack bar is made in the form of the drum comprising a toothed-pinion belt put on the spools and the pinions, at that the spools are located one horizontal plane, one of the spools is installed on the driven shaft, and the pinions are located on both sides of the horizontal plane of the spools location to form a polygon; the spools are connected with a clamp connected via the lever to the handle mounted with the ability of fixation; and on the toothed-pinion belt the toothed elements are placed in the form of tracks, corresponding to the lines with different pitches. At that the toothed elements are made composite and can be manufactured, for example, from textolite.

EFFECT: improvement of the mechanism.

2 cl, 6 dwg

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