RU2170787C1 - Semifinished article moving mechanism of sewing machine - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: mechanism has transporting rack, pressure grip and needle plate. Transporting rack is mounted for reciprocation in horizontal plane in needle plate slot. Needle plate is mounted for reciprocation in vertical plane along guide, which is positioned for turning along immovable circular guide so that it may be fixed on it in predetermined position and kinematically connected to device for turning and fixing of guide providing reciprocating motion of needle plate in vertical plane along circular guide. Mechanism is used in equipment for connecting (assembling) of parts of fabric or like materials by threads. Mechanism allows such operations as fitting of fabric lower layer and tightening of upper and lower layers to be avoided (it is important in sewing of materials containing chemical/synthetic fibers and threads at increased speeds exceeding 2,500 rev/min). EFFECT: wider operational capabilities of rack mechanism for transportation of semifinished article by providing formation of folds (creases) in the process of sewing fabric, and increased efficiency. 2 dwg

Description

 The invention relates to technological equipment for joining-assembling parts from fabric and similar materials using threads.

 Known mechanisms for moving semi-finished sewing machines in which the conveyor rail moves in horizontal and vertical planes. Such a mechanism is used in many sewing machines / for example, F. I. Chervyakov and others. Sewing machines. Ed. "Engineering", M., 1976 /. This mechanism does not provide stable movement of the semi-finished product, as the period of movement is accompanied by the impact of the rail on the semi-finished product and the presser foot. At high speeds of the machine, this causes the foot to bounce and freeze, as a result of which it does not press the semi-finished product during this movement period to the rail. When moving, the working surface of the rail does not remain parallel to the direction of its movement. The consequence of these reasons is the involuntary change in the length of stitches when changing the sewing speed, the "wobble" stitches, the shift of the layers of the semi-finished product / fit /.

 Also known movement mechanism according to the patent of France N 1592688, class. D 05 B 27/00 dated 06/26/2010, in which the semi-finished product movement mechanism comprises a conveyor rail mounted for movement only in the horizontal plane, a presser foot, a needle plate mounted for movement in the vertical plane.

 These rack and pinion movement mechanisms do not exclude the landing of the lower layer of tissue and the contraction of the upper and lower layers. This affects the quality of the stitch, especially when sewing materials containing chemical / synthetic / thread and when sewing at high speed / more than 2500 rpm /.

 The essence of the technical solution and significant differences.

 The proposed single rack mechanism for moving the semi-finished sewing machines eliminates the noted disadvantages of this type of movement mechanisms, expanding its technological capabilities.

 The mechanism for moving the semi-finished sewing machine includes a conveyor rail mounted with the possibility of reciprocating movement in the horizontal plane in the slot of the needle plate and kinematically connected with the mechanism of its reciprocating movement in the horizontal plane in the slot of the needle plate, presser foot, needle plate mounted with the possibility of reciprocating movement in a vertical plane and kinematically associated with the mechanism of its reciprocating movement in the vertical plane, and the needle plate has a guide for its reciprocating movement in a vertical plane mounted with the possibility of rotation along a fixed circular guide and with the possibility of fixing on it in a certain position and kinematically connected with the device for turning and fixing the guide for reciprocating movement needle plate in a vertical plane on a fixed circular guide.

 The proposed mechanism allows to eliminate the landing and tightening of the layers of the semi-finished product, extends the technological capabilities of a single rack-and-pinion mechanism for moving the semi-finished product of the sewing machine due to the possibility of sewing with the formation of assemblies / folds / fabric. The mechanism eliminates the need for special machines, for example with two conveyor rails.

 In FIG. 1 shows a diagram of the mechanism for moving the semi-finished product.

 In FIG. 2, a, b, c - diagram of the mechanism.

 The transporting rail 1 is mounted on a slider 2 mounted with the possibility of reciprocating movement along the horizontal guide 3. In the fork of the slider 2 there is a stone-slider 4, covering the eccentric 5 with adjustable eccentricity.

 The tab 6 serves to press the sewing semi-finished product 7. The transporting rail 1 is placed in the slot of the needle plate 8. The working surface of the rail 1 protrudes above the platform 9 of the machine.

 The needle plate 8 is mounted with the possibility of reciprocating movement along the guide 10, which is mounted with the possibility of rotation on a fixed circular guide 11 and with the possibility of fixing on it with screws 12 or lever 13. To rotate the guide 10 is an angular lever 13 associated with the device manual or software rotation of the guide 10. The needle plate 8 is kinematically connected with the mechanism of reciprocating movement along the guide 10, which includes the connecting rod 14 and the angle lever 15. As such a mechanism, for example, a mechanism for vertically moving a conveyor rail of known sewing machines can be used / in FIG. 1 not shown.

 The mechanism for moving the semi-finished product is as follows.

 Preliminarily, the semi-finished product 7 is laid on the machine platform 9, on which the presser foot 6 / Fig. 1/. When the machine is running, the slider 2 in the place with the rail 1 receives horizontal reciprocating movement along the guide 3 from the eccentric 5 through the stone-slider 4. The needle plate 8 receives reciprocating movement in a vertical plane along the guide 10 from the mechanism of the reciprocating movement of the needle plate through the connecting rod 14 and the lever 15. The sequence, periods and phases of the movement of the movement mechanism are the same as in the usual single rack and pinion mechanism for moving the semi-finished sewing machines. In this case, the movement of the semi-finished product 7 occurs during the period when the upper surface of the needle plate 8 is located below the working surface / teeth / staff. When the needle plate overlaps 8 teeth of the rack 1, the movement of the semi-finished product 7 is absent.

 There are three possible cases of the mechanism / Fig. 2, a, b, c /.

 In the first case / Fig. 2, a / the mechanism works like a conventional rack-and-pinion mechanism for moving a semi-finished sewing machine with the above advantages over the known mechanisms. In this case, the guide 10 is pre-installed and fastened with screws 12 on the guide 11 so that the needle plate 8 performs vertical reciprocating movements.

 In the second case, the mechanism works to eliminate the landing of the lower fabric layer and the tightening of the upper and lower layers, which is necessary when sewing materials containing synthetic threads, it is necessary to stretch the fabric in front of the needle / Fig. 2, b /. To do this, the needle plate 8 is installed obliquely to the rail 1, for which the guide 10 is rotated counterclockwise along the guide 11 to the desired angle and is mounted on it with screws 12 in this position. As a result, during the operation of the machine, in a certain period of movement, a zone of inhibition of the lower tissue layer appears in front of the needle, and behind the needle, a zone of tissue movement. As a result of this, the fabric is stretched and planting of its lower layer does not occur. At the same time, tissue contraction also does not occur.

 In both cases of the mechanism, the guide 10 is disconnected from the rotation device of the guide 10.

 In the third case, the mechanism works with the formation of assemblies / folds / sewn material / Fig. 2, in /. In this case, the needle plate 8 is installed with a reverse angle of inclination with respect to the transporting rail 1. To do this, the guide 10 is rotated along the guide 11 by the required angle clockwise and fastened to it in this position by the locking screws 12. Then, when the machine is in operation, a certain period of movement, the tissue deceleration zone occurs behind the needle, at the end of the presser foot 6, and the movement zone - in front of the needle, at the beginning of the presser foot 6. As a result, when the machine is working, tissue folds are formed that are fixed to the threads and when tightening the stitches.

 If necessary, change the degree of stretching of the lower layer of fabric / 2 case of the mechanism / or the size of the folds / 3 case of the mechanism / during sewing, rotation and fixing of the guide 10 is carried out using the lever 13 manually or from a software device. In this case, the locking screws 12 must be released.

Claims (1)

 The mechanism for moving the semi-finished sewing machine, including a conveyor rail mounted with the possibility of reciprocating movement in the horizontal plane in the slot of the needle plate and kinematically connected with the mechanism of its reciprocating movement in the horizontal plane in the slot of the needle plate, presser foot, needle plate mounted with the possibility of reciprocating movement in a vertical plane and kinematically associated with its reciprocating mechanism stupid movement in a vertical plane, characterized in that the needle plate has a guide for its reciprocating movement in a vertical plane mounted with the possibility of rotation along a fixed circular guide and with the possibility of fixing on it in a certain position and kinematically connected with the device of rotation and fixing the guide back - translational movement of the needle plate in a vertical plane on a fixed circular guide.

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