Needle swing unit of sewing machine

Abstract

The invention relates to a needle swing device of seamer, which arranges one resistance device on the guide element that guides the sliding of needle support that swing left and right with the needle, wherein said resistance device comprises: a plunger element contacted with the sliding surface of needle support; a screw spring for pushing the plunger to the sliding surface; a small screw element and a locking nut for adjusting the elasticity of screw spring; therefore, it can avoid over-limit motion of step motor in high-speed rotation.

Description

(1) Technical field [0001] The present invention relates to a needle swing device for a sewing machine that swings the needle bar left and right, and relates to a countermeasure that can prevent overrunning caused by an imbalance of a stepping motor, which is a driving source, and can easily prevent overrunning Component installation and adjustment of the needle pendulum device of the sewing machine. (2) Background technology [0002] In the past, zigzag sewing machines were equipped with a needle swing device using a stepping motor as a driving source, so that the lowering position of the sewing needle on the needle plate can swing left and right. The needle pendulum device has: a sliding shaft that slides in the left and right directions following repeated rotations of the stepping motor; The zigzag sewing performed by the zigzag sewing machine is realized in this way: the repeated rotation of the stepper motor is transmitted to the needle bar support frame through the sl...

AI Technical Summary

Problems solved by technology

[0005] However, in this pendulum device, a pressing member is arranged between two bearing pads that support the slide shaft so as to be swingable in the axial length direction. In order to prevent the pushing member from being misaligned, it is necessary to adjust the position of the bearing pads on both sides. There is a problem that adjustment work is difficult when adjusting the installation position

[0006] In order to reduce the inertia of the output side member of the stepping motor and prevent the occurrence of the above-mentioned imbalance, the above-mentioned sliding shaft is generally made of non-ferrous metal such as aluminum, and is made hollow inside to reduce the weight. Therefore, the pushing member When pushing against such a sliding shaft and applying sliding resistance, there is a problem that wear and deformation will occur in the pushing part, resulting in deterioration of durability.

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