Sewing machine

A technology for sewing machines and objects to be sewn, applied in the field of sewing machines, can solve problems such as difficulty in evenly tightening stitches and inability to obtain beautiful stitches, so as to improve sewing efficiency, beautiful stitches, and prevent knotted needles trace effect

Inactive Publication Date: 2009-03-04
JUKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This knotting stitch has the following problem: when the thread is tied by the lifting of the scale, it is difficult to tight

Method used

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Examples

Experimental program
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Example Embodiment

[0026] The following reference Figure 1 ~ Figure 6 Specific embodiments for implementing the present invention will be described in detail. In addition, in this embodiment, the direction of each part of the sewing machine 1 is determined based on the XYZ axis shown in each figure. When the sewing machine 1 is installed on a horizontal surface, the Z-axis direction indicates the vertical direction, the Y-axis direction indicates the left-right direction that coincides with the longitudinal direction of the sewing machine arm 11, and the X-axis direction indicates the horizontal and the Y-axis The direction is orthogonal to the front and rear directions.

[0027] (the whole frame)

[0028] (Sewing rack)

[0029] Such as figure 1 As shown, the sewing frame 10 is composed of a sewing machine arm 11 extending along the longitudinal direction (Y-axis direction) of the sewing machine table, a sewing machine base 12 opposite to the sewing machine arm 11, and a sewing machine arm 11 conn...

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PUM

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Abstract

The invention provides a sewing machine which applies a proper thread tensile force no mater what the cloth feeding direction is. A feeding switching detection sensor (46) is set to detecting whether the cloth feeding direction switches from forward to backward by the operation of the returning operation bar (45). The controlling unit (100) works according to the detection signal from the feeding switching detection sensor (46) and a touch auxiliary switch (47), while the feeding direction is detected to switched from forward to backward, the controlling unit (100) reduces the thread tensile force automatically by a thread adjusting solenoid (53); Thus, knotted stitch is prevented from being created in backward feeding switching. Consequently, pretty stitches can be achieved.

Description

technical field [0001] The present invention relates to a sewing machine provided with a thread adjusting device which makes the tension of the thread variable by electric control. Background technique [0002] Currently, as described in Patent Document 1, for example, there is known a sewing machine provided with a thread adjusting device for setting the tension of the needle thread supplied to the sewing needle through electrical control. [0003] And, the upper thread supplied from the upper thread supply source outside the sewing machine passes through the thread guide part, thread adjuster, balance, needle bar and sewing needle provided on the arm of the sewing machine, and is sewn onto the cloth. [0004] In addition, for example, it is desired to set an appropriate tension of the upper thread according to the thickness of the thread or the type of stitch pattern, or the sewing stage (when sewing is stopped, when the thread is trimmed, etc.), the above-mentioned thread...

Claims

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Application Information

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IPC IPC(8): D05B47/04
Inventor 绪方孝宏
Owner JUKI CORP
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