Elastic band ring-forming device and full-automatic elastic band sewing machine

Abstract

The invention discloses an elastic band ring-forming device and a full-automatic elastic band sewing machine. The elastic band ring-forming device comprises an active feeding device of elastic bands, a down-swing traction device and a splicing device; the active feeding device is internally provided with a vertical conveying channel, the splicing device includes a first splicing fixture and a second splicing fixture, and the down-swing traction device comprises a down-swing arm and a traction fixture; the first splicing fixture and the second splicing fixture are opened and are arranged below the starting and ending positions of the traction fixture respectively, the traction fixture clamps one end of an elastic band at the starting position, penetrates through the clamping opening of the first splicing fixture and swings downwards, and meanwhile the active feeding device continuously feeds the elastic bands; the traction fixture swings and penetrates through the clamping opening of the second splicing fixture to the ending position, the first splicing fixture and the second splicing fixture are closed to clamp the two ends of the elastic band and turn over inwards to fold the elastic band into a ring.

Description

technical field [0001] The invention relates to the field of sewing machines, in particular to an elastic band loop forming device and a fully automatic elastic band sewing machine. Background technique [0002] The fully automatic elastic band sewing machine is used for sewing elastic bands. The fully automatic elastic band sewing machine includes an elastic band loop forming device and a sewing device. The traditional elastic band loop forming device includes an elastic band feeding device, an elastic band clamping device and an elastic band turning device, and the elastic band turning device includes two turning fixtures. When the elastic band is looped, the chuck of the elastic band clamps one end of the elastic band, and the chuck is pulled laterally outward so that the elastic band falls into the jaws of the two overturning jigs, the jaws of the overturning jigs are closed and the other end of the elastic band is cut off, and the two The two overturning fixtures are ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the prior art are: 1. The elastic band is directly pulled by the elastic band clamping device, and the elastic band itself has elasticity, and elastic deformation occurs during pulling. The friction force of the feeding device changes to a certain extent during the operation of the machine, resulting in different lengths of elastic bands after sewing, and a low yield rate

2. The first choice for the elastic band clamping device is to clamp one end of the elastic band and then pull it horizontally, so one end of the elastic band needs to be kept straight. In reality, the elastic band will sag to a certain extent due to its own weight, and there is a certain probability that the elastic band will sag. The elastic band clamping device cannot clamp one end of the elastic band, resulting in idling of the machine and lowering the sewing efficiency of the elastic band

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