Sewing machine

Abstract

A seaming machine comprises a cloth press (20) capable of lifting up and down to support a press stand (21), a cutter (40) arranged under a needle plate (11) and provided with a fixed blade (41) and a movable blade (42), a step motor (13) as the drive source of the cloth press (20) and the cutter (40), and a power transmitter (50) for transmitting rotary drive force of the step motor (13) to each mechanism, wherein the power transmitter is provide with two rotary cams (51, 52) driven by the step motor, while the cams can transmit drive force on each mechanism. And an actuating quantity adjuster (59) is arranged between the cloth press and the rotary cams to adjust the driving quantity. The seaming machine can realize optimized rotation of step motor.

Description

technical field [0001] The present invention relates to a sewing machine that continuously operates a cloth press mechanism and other mechanisms connected thereto. Background technique [0002] As is well known, a sewing machine is equipped with a presser mechanism and other mechanisms that press down the presser foot to press the sewing object on the needle plate. single stepper motor. For example, there is a structure in which, for each mechanism, a rotary cam independently imparting a driving force is provided, and each rotary cam is simultaneously rotated by a single stepping motor (for example, refer to Patent Document 1). [0003] On each rotary cam, a transmission mechanism composed of a swinging arm and a plurality of link members is provided separately through the cam follower, and the cloth pressing mechanism and the cutting mechanism follow a predetermined sequence through one rotation of the stepping motor. Take action. [0004] Patent Document 1: JP-A-2003-21...

AI Technical Summary

Problems solved by technology

[0005] However, when the rotary cam is used to lift the presser foot to the presser mechanism, if the thickness of the object to be sewn is thick, the presser foot cannot be lowered to a predetermined lowering position. The problem that the cam follower of the mechanism cannot rotate around the rotating cam and prevents the rotation of the rotating cam

At this time, there are disadvantages as follows: As for the presser mechanism, since the rotary cam is further rotated to raise the presser foot, the presser foot cannot be raised, and at the same time, the cutting mechanism that realizes interlocking cannot be performed, etc. other actions of

[0006] In addition, there is a disadvantage that when the output of the stepping motor is large, the presser foot is forcibly lowered, and although it is possible to escape from the non-rotatable state, at this time, an imbalance occurs due to an increase in the load, and thereafter , the actions of various institutions cannot be performed at the correct time point

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