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Feed lifting height adjusting method for sewing machine

A technology of height adjustment and height adjustment mechanism, applied in sewing machine components, sewing equipment, cloth feeding mechanism, etc., can solve problems such as affecting the sewing quality, changing the sewing machine feeding needle distance, reverse, and back dragging.

Active Publication Date: 2021-04-09
JACK SEWING MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that in the prior art, although the height of the feeding teeth is adjusted by changing the installation position of the tooth lifting fork on the tooth lifting shaft, it also changes the feeding pitch of the sewing machine at the same time, which affects the sewing quality.
[0005] In particular, the above-mentioned method of adjusting the tooth lift height cannot increase the tooth lift height of the feed dog without limit. After adjusting the tooth lift height of the feed dog to a certain height, if it continues to increase, such as increasing to Figure 4 The tooth lift height Z in the shown view, at this time, the stitch length of the sewing machine is X, then when the feed dog moves to Figure 4 In the areas P1 and P2, the phenomenon that the feed dog reverses and drags the sewing material back will appear, which will affect the sewing quality and limit the maximum lifting height of the feed dog

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Feed lifting height adjusting method for sewing machine
  • Feed lifting height adjusting method for sewing machine
  • Feed lifting height adjusting method for sewing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 of the sewing machine: The tooth-lift height adjustment mechanism changes the first tooth-lift drive by changing the tooth-lift eccentricity W between the matching center O1 of the tooth-lift eccentric wheel 51 and the tooth-lift connecting rod 52, and the rotation center O2 of the main shaft 10. Component transmission efficiency.

[0054] Such as Figure 5 to Figure 9 As shown, in the first embodiment of the sewing machine, the tooth-lifting eccentric wheel 51 is sleeved on the main shaft 10, and the tooth-lifting height adjustment mechanism is a tooth-lifting eccentric adjustment assembly 60, and the tooth-lifting eccentric adjustment assembly 60 is connected with the main shaft 10 and the tooth-lifting eccentric wheel 51, and the right end of the main shaft 10 is fixedly equipped with a handwheel 130. Lifting teeth eccentric adjustment assembly 60 includes ratchet 61, adjusting slider 62 with ratchet portion 621 at the lower end, adjusting eccentric whe...

Embodiment 2

[0057] Embodiment 2 of the sewing machine: the tooth-lifting height adjustment mechanism changes the first tooth-lifting drive by changing the tooth-lifting eccentricity W between the matching center O1 of the tooth-lifting eccentric wheel 51 and the tooth-lifting connecting rod 52, and the rotation center O2 of the main shaft 10. Component transmission efficiency.

[0058] The difference between the second embodiment of the sewing machine and the first embodiment of the sewing machine is that the structure of the lifting eccentric adjustment assembly 60 is different; therefore, in the second embodiment of the sewing machine, as Figure 10 to Figure 12 As shown, the tooth-lifting eccentric wheel 51 is sleeved on the main shaft 10, and the tooth-lifting height adjustment mechanism is a tooth-lifting eccentric adjustment assembly 60, and the tooth-lifting eccentric adjustment assembly 60 is connected with the main shaft 10 and the tooth-lifting eccentric wheel 51. The right end ...

Embodiment 3

[0061] Embodiment 3 of the sewing machine: the height adjustment mechanism of the tooth lift changes the transmission efficiency of the first tooth lift transmission assembly by changing the transmission efficiency between the tooth lift connecting rod 52 and the tooth lift crank 53 .

[0062] In the third embodiment of the sewing machine, as Figure 13 to Figure 16 As shown, the tooth lifting height adjustment mechanism includes an adjustment drive assembly and an adjustment operation part 120; the tooth lifting eccentric wheel 51 is fixed on the main shaft 10 through screw locking; the upper end of the tooth lifting connecting rod 52 is rotatably sleeved on the tooth lifting eccentric wheel 51 The outer periphery of the tooth lift transmission assembly also includes a tooth lift adjustment seat 54, a first swing plate 55 and a second swing plate 56, and the lower end of the tooth lift connecting rod 52 passes through the tooth lift adjustment seat 54, the first swing plate 55...

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Abstract

The invention provides a feed lifting height adjusting method for a sewing machine. The sewing machine is provided with a main shaft, a feed lifting shaft parallel to the main shaft, a feed frame, a feed dog installed on the feed frame, a first feed lifting transmission assembly connected between the main shaft and the feed lifting shaft, and a second feed lifting transmission assembly connected between the feed lifting shaft and the feed frame. The feed lifting height adjusting method comprises the following steps: 1, a feed lifting height adjusting mechanism is arranged in the sewing machine, and the feed lifting height adjusting mechanism acts on the first feed lifting transmission assembly; 2, when feed lifting height needs to be adjusted, the feed lifting height adjusting mechanism acts to change the transmission efficiency of the first feed lifting transmission assembly, so that the swing amplitude of the feed lifting shaft driven by the main shaft through the first feed lifting transmission assembly is changed, and thus the feed lifting height of the feed dog is adjusted, the universality of the sewing machine is greatly improved, and therefore, the adaptability of the sewing machine to different sewing materials is greatly enhanced, and the competitiveness of products is improved.

Description

technical field [0001] The invention relates to the field of sewing machines, in particular to a method for adjusting the height of a tooth lift for a sewing machine. Background technique [0002] Such as figure 1 As shown, all kinds of sewing machines (i.e., lockstitch sewing machines) on the market at present all include the main shaft 100 driven to rotate by the main motor, the tooth frame 200, the feed dog 300 installed on the tooth frame 200, and the one end connected to the main shaft 100 and the tooth frame 200. The tooth lifting mechanism 400 between them, and the feeding mechanism 500 connected between the main shaft 100 and the other end of the tooth frame 200, the main shaft 100 drives the tooth frame 200 and the feeding tooth 300 to reciprocate up and down through the tooth lifting mechanism 400, and the main shaft 100 passes the feeding The mechanism 500 drives the rack 200 and the feed dog 300 to reciprocate back and forth. Therefore, the feed dog 300 perform...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D05B27/24
CPCD05B27/24
Inventor 何明金祝书伟柯祥林郑吉郏彬辉
Owner JACK SEWING MASCH CO LTD
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