A tooth-lifting mechanism and sewing machine with adjustable tooth-lifting height

Abstract

The invention provides a tooth-lifting mechanism with adjustable height, comprising a main shaft, a tooth-lifting shaft, a tooth frame, a feeding dog, a first tooth-lifting transmission component connected between the main shaft and the tooth-lifting shaft, and a tooth-lifting shaft connected to the tooth-lifting shaft. The second tooth lift transmission assembly, the adjustment drive assembly, and the adjustment operation part between the tooth frame and the tooth frame, the first tooth lift transmission assembly includes a tooth lift eccentric fixed on the main shaft, a first tooth lift link, and a second tooth lift A connecting rod, and a tooth-lifting crank fixed on the tooth-lifting shaft, one end of the first tooth-lifting link is rotatably sleeved on the outer periphery of the tooth-lifting eccentric, the other end is hinged with one end of the second tooth-lifting link, the second The other end of the tooth-lifting link is hinged with the tooth-lifting crank, and the adjustment operation part acts on the first tooth-lifting transmission assembly through the adjustment drive assembly to change the position of the hinge point of the first tooth-lifting link and the second tooth-lifting link, Thereby, the transmission efficiency between the tooth-lifting eccentric wheel and the tooth-lifting shaft is changed, the height of the tooth-lifting is adjusted, and the versatility of the sewing machine is improved.

Description

technical field [0001] The invention relates to a tooth-lifting mechanism with adjustable height. [0002] The present invention also relates to a sewing machine including the above-mentioned tooth-lifting mechanism. Background technique [0003] like figure 1 As shown, various types of sewing machines currently on the market include a main shaft 100 driven and rotated by a main motor, a tooth frame 200, a feed dog 300 installed on the tooth frame 200, and a tooth-lifting mechanism connected between the main shaft 100 and one end of the tooth frame 200 400, 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 dog 300 to reciprocate up and down through the tooth lifting mechanism 400, and the main shaft 100 drives the tooth frame 200 through the feeding mechanism 500. Reciprocate back and forth with the feed dog 300. Therefore, the feed dog 300 performs a c...

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.

[0006] 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 feeding teeth will reverse and drag the sewing material back, which will affect the sewing quality

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