Feed dog driving mechanism of sewing machine and feed dog positioning method

Abstract

The invention provides a feed dog driving mechanism of a sewing machine and a feed dog positioning method, and particularly relates to the technical field of sewing machine manufacturing. The driving starting position, namely the zero point starting position, is determined by gratings of a feed dog lifting motor and a cloth feeding motor; a feed dog frame seat is arranged on a cloth feeding shaft in a sleeving manner, a feed dog lifting fork-shaped crank is arranged on a feed dog lifting shaft in a sleeving manner, and a feed dog frame and a feed dog are in a freely movable state; the feed dog is moved to the central position of the front and back feed stroke in a needle plate, and the feed dog frame seat is fixed on the cloth feeding shaft; and finally, the highest point of the tip of the feed dog is moved to the position flush with the upper plane of the needle plate, and the feed dog lifting fork-shaped crank is fixed to the feed dog lifting motor. The cloth feeding motor and the feed dog lifting motor are used for controlling the cloth feeding shaft and the feed dog lifting shaft respectively, so that the angle of the stitch length generated by the feed dog is increased, the running precision of the feed dog is improved, and the intelligent control level of the sewing machine on the feed dog is improved.

Description

technical field [0001] The application proposes a feeding dog driving mechanism and a feeding dog positioning method of a sewing machine, specifically relating to the technical field of sewing machine manufacturing. Background technique [0002] In the driving mechanism of the sewing machine, the main motor is installed on the head of the sewing machine, the output spindle connected to the main motor, and the eccentric wheel is fixed on the output spindle. sports. The cloth feeding connecting rod drives the cloth feeding shaft to rotate at a certain angle through the swing seat assembly, and the tooth lifting connecting rod drives the tooth lifting shaft to swing at a certain angle through the tooth lifting crank; the swing of the cloth feeding connecting rod and the cloth feeding shaft drives the cloth feeding dog frame to swing Thus, the feed dog moves back and forth; the tooth lift connecting rod and the tooth lift shaft swing to drive the tooth lift fork on the tooth li...

AI Technical Summary

Problems solved by technology

However, the above-mentioned needle distance adjustment mechanism has the following defects: it is manually adjusted, so the operation is cumbersome and passive, and the needle distance cannot be automatically adjusted during the sewing process.

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