Control device and control method of sewing machine

Abstract

The present invention provides a control device and a control method of a sewing machine. The control device of the sewing machine easily sets the height data of the sewed object into the sewing pattern data. The control device of the invention comprises the following components: a motor of sewing machine, which causes a sewing needle to move vertically; an intermediate presser foot which prevents the floating of the sewed object in sewing; an intermediate presser foot vertical-moving mechanism which vertically moves the intermediate presser foot synchronously with the sewing needle; a height adjusting mechanism which adjusts the height of a lower dead point of the intermediate presser foot through the intermediate presser foot motor; an intermediate presser foot control unit which controls the intermediate presser foot motor for stopping the intermediate presser foot through the pressing when the intermediate presser foot descends and contacts; a thickness obtaining unit which computes the thickness of the sewed object according to the height of the intermediate presser foot in the state variation of an output shaft of the intermediate presser foot motor, which is caused by the descending and contacting of the intermediate presser foot; and a thickness recording unit which records the thickness of the sewed object into the sewing pattern data corresponding with the sequence of the needle number.

Description

technical field [0001] The invention relates to a control device of a sewing machine with an intermediate presser foot and a control method of the sewing machine. Background technique [0002] At present, in a sewing machine that performs stitch formation of a predetermined shape while moving a frame-shaped cloth holding member that holds the cloth relative to the vertical movement position of the sewing needle, the cloth holding member does not affect the stitches to be sewn near the center of the frame of the cloth holding member. The holding force of the product is not sufficient, so when the sewing needle is raised, the material to be sewn is pulled up by the frictional resistance between the sewing needle and the so-called chattering phenomenon, and there is a thread tension that cannot form an appropriate stitch. A case of reduced quality. [0003] Therefore, in order to prevent the object from being pulled up when the sewing needle rises, an intermediate presser foot...

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional sewing machine disclosed in Patent Document 1, the height of the bottom dead center of the intermediate presser must be changed and confirmed for each stitch (needle drop) in advance, and the setting operation is very complicated.

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