Ring sewing machine

Abstract

The invention relates to a ring sewing machine, which more appropriately prevent the reeling of looping stitches. The ring sewing machine comprises a lower shaft (2) which rotates through the rotation of a sewing machine motor, a looping device (33), which performs reciprocating motion by the rotation of the lower shaft, two thread guiding components (11,12) and two thread control cams (13,14). The two thread control cams are disposed between the two thread guiding components and are peripheral cams disposed on the lower shaft. The looping stitches (L) which traverse through two thread guiding components contact with the periphery of the peripheral cam by sliding. Pressure is applied on the looping stitches by using the radius change of the thread control cam. A thread guiding part (34) is disposed on the way from the thread control cam to the looping device. A thread catching component (20) is disposed in the thread guiding part and conducts thread catching by using the configurations enclosing the looping stitches inserted into the thread guiding part.

Description

technical field [0001] The invention relates to a circular sewing machine, which has a thread control device for controlling the tension of the looping thread. Background technique [0002] For a loop sewing machine that performs overlock sewing and double loop sewing, there is a looper under the needle plate, and sewing is performed by repeatedly performing the following action, that is, the looper that swings under the needle plate catches the seam. The thread loop of the upper suture thread introduced by the needle, and the needle catches the thread loop of the looping thread L1 introduced by the looper. [0003] In this circular sewing machine, the thread control device for applying tension to the looping thread L1 is as follows: Figure 5 As shown, there are: two threading parts 111, 112 as the path of the looping line L1; two thread control cams 113, 114, which are arranged on the lower shaft, and their outer peripheral parts slide with the looping line L1 passing betw...

AI Technical Summary

Problems solved by technology

[0007] Because when removing the looping wire L1 wound on the shaft portion 102b, the looping wire L is located below the threading member 111 and enters between the bearing 103 and the slit of the wire control cam 113, so the removal operation is very difficult and complicated, and must be wasted. A lot of time puts a huge burden on the operator and significantly reduces the efficiency of sewing operations

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