Cloth feeder of sewing machine

Abstract

A cloth feeding device for a sewing machine, comprising: a cloth feeding dog (11) that is mechanically linked with a main shaft driven by a main shaft motor (4) and that moves in and out of a needle plate for conveying cloth, to change relative to a predetermined reference position Corner block (30) for changing cloth feeding distance by tilting angle, pulse motor (50) for changing the tilt angle of corner block and CPU (80) for controlling the rotation position of pulse motor; An encoder (70) that outputs a detection signal for the position or operation value and an operation panel (8) for setting the initial value and the lower limit of the cloth feeding pitch; when operating the joystick, the CPU (80) controls the pulse motor (50) to set the feed pitch corresponding to the operation position or operation amount of the joystick within the range from the initial value to the lower limit value. The cloth feeding device of this sewing machine does not require complicated work during manufacture, can reduce manufacturing cost, and has excellent operability.

Description

technical field [0001] The present invention relates to a cloth feeding device of a sewing machine capable of flexibly controlling the cloth feeding pitch and having excellent operability. Background technique [0002] As a conventional cloth feeding device, it is well known that it has a feed dog that goes in and out of the needle plate with a feed motion along a roughly elliptical movement trajectory, and feeds the cloth according to the feed amount of the horizontal movement amount of the needle plate. The corner block of the feed dog movement path. In such a cloth feeding device, by changing the inclination angle of the corner block relative to the predetermined reference position, the moving track of the feeding dog is changed and the horizontal movement amount of the needle plate is changed, that is, the feeding pitch is changed. [0003] As such a cloth feeding device, such as Figure 11 As shown, it is well known that the joystick 110 provided on the sewing machine ...

AI Technical Summary

Problems solved by technology

[0005] However, on the cloth feeding device that can change the feeding distance by mechanically connecting the joystick 110 and the corner block 210, the operation of assembling the link mechanism for mechanically connecting the joystick 110 and the corner block 210 is very complicated and costly. also very high

[0006] In addition, since the amount of change in the angle of inclination of the corner block 210 relative to the predetermined amount of operation of the joystick 110 is determined in a sense, it cannot be flexibly adjusted according to various sewing conditions or user preferences. The amount of change in feed pitch relative to the predetermined operation amount of the joystick 110

[0007] In addition, when changing the lower limit value of the feed pitch when the joystick is operated, the position of the stopper 140 must be changed, and the adjustment is troublesome.

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