Automatic lifting mechanism for presser foot of sewing machine

Abstract

The invention discloses an automatic lifting mechanism for a presser foot of a sewing machine. The automatic lifting mechanism comprises a housing, a linear actuator, a rotating shaft, an outer swing arm, an inner swing arm, a front lever and a pull rod; the housing is provided with a housing inner cavity; the linear actuator includes a traction rod which can reciprocate in a linear mode, and is fixedly installed on the outer wall of the housing; the rotating shaft is rotatably installed on the housing, the inner end of the rotating shaft is located in the housing inner cavity, and the outer end of the rotating shaft extends out of the housing; one end of the outer swing arm is fixedly connected with the outer end of the rotating shaft, and the other end of the outer swing arm is connected with the traction rod; one end of the inner swing arm is fixedly connected with the inner end of the rotating shaft; the front lever comprises three pin holes, and the first pin hole is rotatably connected to the interior of the housing through a hinge pin; the second pin hole is hinged to a presser foot lifting plate; the rear end of the pull rod is hinged to the other end of the inner swing arm, and the front end of the pull rod is hinged to the third pin hole of the front lever. Due to the fact that the linear actuator is fixed on the outer wall of the housing, the arrangement of the mechanism is more flexible, the space limitation degree on the mechanism is lower, and the mechanism is more convenient to inspect and maintain.

Description

technical field [0001] The invention relates to an industrial sewing machine, in particular to an automatic presser foot lifting mechanism for the sewing machine. Background technique [0002] At present, many industrial sewing machines have adopted an automatic presser foot lifting mechanism to reduce the labor intensity of the operator and improve labor efficiency. The automatic presser foot lifting mechanism is generally driven by an electromagnet to complete the presser foot lifting action. [0003] For example, the Chinese utility model patent CN200820001827.4 discloses a computer direct-driven double-needle lockstitch automatic presser foot lifting mechanism, including an electromagnet, a crank, a lifting pin and a transmission part. On the rear window panel of the needle lockstitch machine head, the transmission part is rotatably installed on the other side of the rear window panel. The power output end of the electromagnet is connected with the crank. The rear windo...

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned prior art, the presser foot lifting mechanism is relatively complicated, which increases the cost of processing and assembly; in addition, the work reliability of these mechanisms is poor, the failure rate is high, and there is also the defect of inconvenient maintenance after failure

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