a sewing machine

A sewing machine and backstitching technology, applied to sewing machine components, sewing equipment, cloth feeding mechanism, etc., can solve the problems of high processing cost, complex structure, redundant transmission chain of the overall structure, etc., to reduce processing cost, simplify the transmission chain, Effects of simplified part design

Active Publication Date: 2021-01-05
JACK SEWING MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above that the structure of the stitch length adjuster and the reverse stitching crank in the existing structure is complicated, the processing cost is high, and the transmission chain of the overall structure is redundant and the structure is complicated

Method used

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Embodiment Construction

[0035] The present invention will be further described below with specific embodiment, see Figure 5-15 :

[0036] A sewing machine, comprising a stitch length adjusting stud 21, an adjuster shaft 22, and a stitch length adjuster 23 fixed on the adjuster shaft 22, which is swingably arranged on the bottom plate (in the figure) by a first positioning pin 24 and a second positioning pin 25 Not shown) on the swing seat 26. The adjusting stud 21 is installed in the casing (not shown in the figure) through threaded rotation, and is used for limiting the needle length adjuster 23 . The adjuster shaft 22 is rotatably arranged in the casing, and the stitch length adjuster 23 is fixedly connected with the adjuster shaft 22 and can rotate synchronously with the adjuster shaft 22 . The upper end of the reverse feeding connecting rod 27 is connected on the stitch regulator 23, and the lower end of the reverse feeding connecting rod 27 is connected on the swing seat 26, and the swing sea...

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PUM

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Abstract

The invention belongs to the technical field of sewing devices, and particularly discloses a sewing machine. The sewing machine comprises a stitch-length adjusting screw column, an adjuster shaft, a stitch-length adjuster fixed on the adjuster shaft and a swinging base swinging on a bottom plate through a first positioning pin and a second positioning pin, the upper end of a back feeding connecting rod is connected on the stitch-length adjuster, the lower end of the back feeding connecting rod is connected on the swinging base, and the swinging base is also connected with the lower end of a backstitch pulling rod; both the backstitch pulling rod and the back feeding connecting rod are connected at the same end of the swinging base, the upper end of the backstitch pulling rod is hinged to an iron core of a backstitch electromagnet through a backstitch crank, the backstitch crank is fixedly arranged on a backstitch wrench shaft, the backstitch wrench shaft is driven by the backstitch electromagnet to rotate, and the middle of the back feeding connecting rod is connected with the bottom plate through a reset pulling spring. According to the sewing machine, a transmission chain of a front-stitch and backstitch mechanism is simplified, complex part designing is simplified, and the processing cost of parts is reduced.

Description

Technical field: [0001] The invention belongs to the technical field of sewing equipment, in particular to a sewing machine. Background technique: [0002] When the lockstitch sewing machine is sewing, the reverse stitching is often used to reinforce the sewing material at the beginning and end of the stitching. In order to make the stitches beautiful, it is required that the forward and reverse stitches have the same pitch so that the stitches can overlap perfectly. [0003] The existing sewing machine stitch distance switching structure is as follows: it includes a stitch length adjustment stud, an adjuster shaft and a stitch length adjuster fixed on the adjuster shaft. The stitch length adjuster includes a main body, and at one end of the main body A V-shaped groove is provided, and a crank part connected to the upper end of the reverse feeding connecting rod is provided at the other end of the main body. A fork is provided at the lower end of the main body between the V-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B27/22D05B27/00
CPCD05B27/00D05B27/22
Inventor 柯祥林祝书伟郑吉
Owner JACK SEWING MASCH CO LTD
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