Machine needle cooling mechanism of sewing machine, sewing machine and air suction and exhaust mechanism

Abstract

The invention relates to a machine needle cooling mechanism of a sewing machine, a sewing machine and an air suction and exhaust mechanism, wherein the air injection amount can be increased. According to the technical scheme of the invention, a cover part is covered onto a cylinder part. A valve chamber is formed between the cover part and the upper end of the cylinder part. The cover part is provided with a suction port and an exhaust port. The valve chamber is communicated with the outside via the suction port and the exhaust port. A circular ring-shaped valve core with a circulation port at the center thereof is arranged in the valve chamber. The valve core is in a non-fixed state in the valve chamber and is capable of moving up and down. A piston is arranged at the upper end portion of a needle bar. The needle bar moves up and down to drive the piston to move downwards, and the external air enters the valve chamber via the suction port to push the valve core downwards. The air that enters the valve chamber flows into a pump chamber via the circulating port of the valve core. When the piston moves upwards, the piston compresses the air the pump chamber. The compressed air pushes the valve core and then the valve core blocks the suction port. The compressed air is injected to the outside via a pipeline through the circulating port and the exhaust port, so that the machine needle of the sewing machine can be cooled.

Description

technical field [0001] The invention relates to a sewing machine needle cooling mechanism, a sewing machine and an air suction and exhaust structure. Background technique [0002] The needle bar of the sewing machine moves up and down under the drive of the sewing machine motor. The needle bar is equipped with an organic needle at the lower end. The shuttle of the sewing machine rotates under the drive of the sewing machine motor. A bobbin wound with a bobbin thread is accommodated in the shuttle. The needle bar and the shuttle cooperate to interweave the upper thread supplied to the needle and the lower thread supplied by the bobbin to form stitches on the fabric. In industrial sewing machines, the needle bar moves up and down at high speed. Frictional heat is generated when the needle rubs against the fabric. When the temperature of the friction heat becomes high, the fabric may melt and the upper and lower threads may break. Some sewing machines have a needle coolin...

AI Technical Summary

Problems solved by technology

In the needle bar assembly described in the above publication, when the needle bar corresponding to the piston moves up and down at high speed, it is difficult for the spool to move up and down periodically following the up and down movement of the needle bar.

The needle bar assembly may not be able to introduce enough air into the interior to compress the air enough to increase the injection volume

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