A sewing machine roller presser foot forward and backward sewing driving mechanism

Abstract

The invention provides a sewing machine roller presser foot stitch and backstitch driving mechanism, and belongs to the technical field of machinery. The sewing machine roller presser foot stitch and backstitch driving mechanism solves the problem that an existing Roland machine roller presser foot stitch and backstitch driving mechanism is high in noise. The sewing machine roller presser foot stitch and backstitch driving mechanism comprises an electromagnet, an upper coupling shaft, a power assembly and a lower coupling shaft, wherein the electromagnet drives the upper coupling shaft to be meshed with or separated from the lower coupling shaft through a transmission mechanism, the transmission mechanism comprises a fixedly arranged guide part and a horizontally arranged rotary shaft, a driving part is arranged in the guide part and is fixedly connected with the upper end shaft of the upper coupling shaft, a supporting base fixedly and axially connected with the rotary shaft is further fixedly connected in the machine head of a sewing machine, the iron core of the electromagnet is connected with the rotary shaft through a connecting piece and can drive the rotary shaft to rotate in the circumferential direction, the driving mechanism further comprises a tension spring which makes the driving part to move downwards, and a connecting structure which can make the driving part to overcome the tension of the tension spring to move upwards when the rotary shaft rotates in the circumferential direction is arranged between the rotary shaft and the driving part. The sewing machine roller presser foot stitch and backstitch driving mechanism has the advantage of being low in noise.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to a forward and backward sewing drive mechanism of a sewing machine roller presser foot, in particular to a forward and reverse sewing driving mechanism of a sewing machine roller presser foot. Background technique [0002] The sewing machine adopts electrical integration to realize automatic operations such as automatic thread trimming, automatic presser foot lifting, and automatic backstitching. The upper and lower rollers and needles are used to feed material synchronously. The cloth feeding system is safe and reliable, making the sewing smooth and the stitches beautiful. Suitable for leather sewing materials of various thicknesses. According to the needs of the market, the double-needle series is available in various gauges. [0003] At present, the needle bar oscillating device in the sewing machine usually adopts an air cylinder to drive the oscillating device. Because the...

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Problems solved by technology

[0006] However, there is a problem in the above-mentioned drive mechanism: since the drive mechanism controls the engagement or separation of the upper connecting shaft and the lower connecting shaft through the up and down swing of the roller connecting lever, the torque it receives in the process of the roller connecting lever swinging up and down Larger, so that the length of the roller connecting lever will be relatively long in actual production, resulting in a larger volume of the drive mechanism. Under the premise that the volume of the head of the roller car remains unchanged, the drive mechanism is partly located outside the head, resulting in Makes a lot of noise when working

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