Noise reduction device for sewing machine and sewing machine

Abstract

The invention provides a noise reduction device for a sewing machine, which includes a main shaft, a driving motor for driving the main shaft to rotate, and a hand wheel. The driving motor has a motor rotor and a motor stator that cooperate with each other. The main shaft has a rotor shaft section that constitutes a part of the motor rotor. It also includes a driving shaft coaxial with the main shaft, one end of the driving shaft is fixed to the hand wheel; when the driving motor is running and the driving main shaft is rotating, the other end of the driving shaft is separated from the rotor shaft section; when the driving motor stops, the When the handwheel drives the main shaft to rotate, the other end of the drive shaft engages with the rotor shaft section. This application can realize the detachability of the main shaft and the hand wheel, effectively shorten the length of the main shaft, and then reduce the processing difficulty of the main shaft; especially, in the process of driving the main shaft to rotate by the driving motor, the main shaft and the hand wheel are in a separated state, so the hand wheel Both the sewing machine and the drive shaft are in a static state, thereby effectively reducing the noise of the sewing machine, reducing the swing of the main shaft, and improving the stability of the main shaft.

Description

technical field [0001] The invention relates to a noise reduction device for a sewing machine. [0002] The present invention also relates to a sewing machine comprising the above-mentioned noise reduction device. Background technique [0003] At present, the sewing machines on the market generally use the main motor to drive the main shaft to rotate, and the main shaft drives the movement of various parts to complete the sewing. In addition, in order to reduce the cost of the sewing machine, the sewing machine manufacturer usually uses the cased motor that constitutes the main motor to use Shell motor to replace, in order to achieve the effect of reducing costs. The shellless motor is different from the shelled motor, because there is no motor shell support at both ends of the shellless motor, so it is impossible to install bearings to support the rotor of the motor. Therefore, the rotor of the shellless motor can only be installed on the main shaft of the sewing machine,...

AI Technical Summary

Problems solved by technology

[0004] 1. In order to connect the rotor and the handwheel of the motor, the part of the main shaft that originally protrudes from the casing needs to be designed longer, resulting in an overly long main shaft, which will make the processing of the main shaft more difficult and the process requirements difficult Guaranteed

[0005] 2. According to the working principle of the motor, the force exerted by the magnetism of the stator on the rotor is an unbalanced force. This force makes the swinging phenomenon of the overly long spindle more obvious when it rotates at high speed, thereby increasing the The instability of the main shaft rotation is more detrimental to the service life of the bearing and the reduction of the noise of the sewing machine

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