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Upper shaft rotation speed control method of sewing machine

A technology of rotation speed and control method, applied in the field of sewing machines

Inactive Publication Date: 2013-11-06
SUNSTAR KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] like Figure 4 As shown, the rotations of the head unit rotary motor 101 and the bed unit rotary motor 102 appear to have nothing to do with each other because they rotate independently of the upper shaft rotation. However, the sewing machine head 107 operates with the moment of inertia based on the upper shaft rotation, so the upper shaft The rotation speed will actually limit the swivel amount based on the swivel motor 101 of the head unit

Method used

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  • Upper shaft rotation speed control method of sewing machine
  • Upper shaft rotation speed control method of sewing machine
  • Upper shaft rotation speed control method of sewing machine

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Experimental program
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Embodiment Construction

[0035] The operation of the conventional sewing head lifting type sewing machine occurs synchronously with the rotation of the upper shaft. That is, a timing pulse is generated synchronously with the rotation of the upper shaft, and a desired operation is performed based on the phase of the timing pulse.

[0036] In sewing machines with a rotatable head, the rotation of the head is also synchronized with the rotation of the upper shaft. However, the swivel amount by the swivel motor 101 of the head unit differs depending on the rotation speed of the upper shaft. In other words, the number of head gyration pulses suitable for each upper shaft rotation speed is different from each other. For example, when the upper shaft rotates at 2,000 rpm, the number of suitable head orbiting pulses for one rotation of the upper shaft is 10, and when the upper shaft rotates at 1,500 rpm, the number of appropriate handpiece orbiting pulses is 15. This means that the rotational speed of the u...

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Abstract

The method involves detecting (S502) a point of time in which deceleration is started, before attaining the time in which head rotating command is produced, by referring a pattern program to control a sewing operation of pattern sewing machine. The rotational speed of upper shaft is gradually reduced (S508) from the detected point of time, before the head rotation command is executed. The head is rotated (S510) based on the head rotation command. The rotational speed of the upper shaft is gradually increased (S512), if the rotational movement of the head is completed.

Description

technical field [0001] The invention relates to a sewing machine with a rotatable machine head, in particular to a method for controlling the rotation speed of an upper shaft based on the rotation amount of the machine head. Background technique [0002] A sewing machine with a rotatable head fixes a sewing object on a table (Table) with clamps, and then drives the clamps to move in the X-Y direction to sew. [0003] figure 1 It is the appearance of the existing sewing head lifting type sewing machine, figure 2 yes figure 1 The device shown is based on the pattern's stitch formation state. figure 2 The left side of d is a diamond pattern, and the right side is a rectangular pattern. [0004] Arrows indicate the direction of pattern formation, and P (Perfect) and H (Half perfect) indicate the quality of the stitches. [0005] P indicates a stitch without a defect, H indicates a stitch with a slight defect, and Hitch Stitch indicates a stitch with a defect. [0006] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B69/18
CPCD05B69/18D05B19/12
Inventor 李昌永
Owner SUNSTAR KK