Sewing machine

Abstract

The present invention provides a sewing machine that can securely move a thread out of the way when the sewing is completed without enlarging the apparatus itself. A second thread tension device 30b that controls reeling out of a sewing thread connected to a sewing needle 103 is provided on one side of a sewing machine arm 13. The second thread tension device 30b is equipped with a tension plate (thread tension equipment) 32 composed of a movable plate 32a and a fixed plate 32b, a thread tension solenoid 33, and a thread take-up spring 34, and is installed outside of the sewing machine arm 13 along the outer surface through an installing member 35 in a way that its longitudinal side is placed parallel to the longitudinal side of the sewing machine arm 13. Thus the second thread tension device 30b can be enlarged without considering interface of other members incorporated inside a sewing machine frame 10 and the thread tension can be enhanced without significantly changing the design of other members of the sewing machine frame 10.

Description

technical field [0001] The present invention relates to a sewing machine with a thread adjusting device that restricts the thread from slipping out. Background technique [0002] Generally, in a sewing machine typified by a lockstitch sewing machine, a thread adjusting device that restricts the supply of the thread to the needle is disposed on, for example, a side portion on the operator's side of the machine head of the sewing machine frame. [0003] This thread adjusting device has, for example, two thread adjusting discs consisting of a fixed disc and a movable disc on both sides of the path of sutures (hereinafter referred to as threads), and the movable disc is pressed to a position by an elastic body such as a coil spring. The side of the fixed disk is used to clamp the wire, so that the appropriate tension can be applied to the wire by its friction. [0004] Furthermore, a thread adjusting device for a sewing machine has been developed, which is provided with a rotat...

AI Technical Summary

Problems solved by technology

However, in the thread adjusting device of the sewing machine described in Patent Document 1, since the longitudinal direction of the thread adjusting device is substantially perpendicular to the longitudinal direction of the machine head, that is, the axial direction of the upper shaft, it is embedded in the sewing machine. Therefore, if the actuator is enlarged in order to increase the thread tension, it will interfere with other mechanism parts arranged in the machine head of the sewing machine frame, making it impossible to enlarge the actuator, resulting in the inability to obtain Sufficient thread tension problem

Or, in order to accommodate a large actuator in the frame, the outer diameter of the frame has to be increased, resulting in weight gain or high cost

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