Thread adjusting device of sewing machine

Abstract

The invention relates to a thread adjusting device of a sewing machine, capable of adjusting the opening amount of a thread adjusting disc without no change of a thread tension in the maximum driving of a solenoid. The thread adjusting device of the sewing machine is characterized in that the thread adjusting device comprises a pair of thread adjusting discs capable of approaching and leaving offto clamp a suture T, a disc pressing part capable of moving to the X direction to being abutted against the line adjusting discs to press the thread adjusting discs, a thread adjusting spring pre-tightening the disc pressing part to the C direction, a driving shaft inserted into the thread adjusting discs and the disc pressing part and moving to the X direction, a set nut screwed on the driving shaft and abutted against the disc pressing part for determining the position of the disc pressing part in the X direction, a solenoid for exerting a driving force corresponding to the stroke of the output shaft connected on the driving shaft in the D direction, and an adjusting screw and fixed nut arranged to move to the X direction, abutted against the driving shaft to limit the movement of the driving shaft to the C direction.

Description

technical field [0001] The invention relates to a thread adjusting device of a sewing machine. Background technique [0002] Currently, there is a known thread adjusting device for a sewing machine, which can change the tension of the thread through electrical control, and has: a thread adjuster, which clamps the thread; and a solenoid, which drives the thread adjuster. force (for example, refer to Patent Document 1). [0003] Such as Figure 6 As shown, in the thread adjusting device 100 , the solenoid 110 and the thread adjuster 120 are arranged to penetrate from the front to the back of the sewing machine frame 101 . The solenoid 110 is provided on the rear side of the sewing machine frame 101 and has an output shaft 111 capable of advancing and retreating in the front-rear direction of the sewing machine frame 101 . The solenoid 110 protrudes the output shaft 111 in a normal state, and when driven, a driving force (attractive force) in a direction to retract the output...

AI Technical Summary

Problems solved by technology

In addition, for example, in order to use sutures with a wide range of suture counts (thickness) in the sewing of leather bags, etc., the distance (opening amount) between the thread adjustment disks 123 and 124 in the open state is set to a larger diameter. If the suture is set wider, then when using a thinner suture, the suture will move between the thread adjustment discs 123, 124 and get off the thread from the thread adjustment discs 123, 124, or it will be drawn out at the beginning. When the thread adjustment disk 123, 124 clamps the suture, the time is prolonged, and more sutures are drawn out than the expected amount, etc., sometimes causing failure.

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