Apparatus for adjusting timing of needle and looptaker of sewing machine

A technology for sewing machines and machine needles, which is applied in the direction of sewing machine needle seats, sewing machine collar mechanisms, sewing machine components, etc., and can solve problems such as inability to ensure stable operation of sewing machines

Active Publication Date: 2011-11-09
SINGER SOURCING LTD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As mentioned above, stable operation of the sewing machine cannot be ensured when the belt tension is not constant with respect to the shuttle speed

Method used

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  • Apparatus for adjusting timing of needle and looptaker of sewing machine
  • Apparatus for adjusting timing of needle and looptaker of sewing machine
  • Apparatus for adjusting timing of needle and looptaker of sewing machine

Examples

Experimental program
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Embodiment Construction

[0036] The first embodiment of the present invention will be described below with reference to the drawings. Such as figure 1 with figure 2 As shown, the sewing machine according to this embodiment includes a housing 1 and a frame 2. The upper shaft 3 is rotatably supported by a pair of bearings 4 and 4 fixed to the frame 2. The hand wheel 5 and the pulley 6 are fixedly installed at one end of the upper shaft 3. The pulley 6 includes a driven pulley 6a with a larger diameter and a timing pulley 6b with a smaller diameter (ie, a first timing pulley). The drive motor 9 is mounted to the frame 2, and the motor pulley 8 is fixedly mounted on the output shaft of the drive motor 9 to rotate. A closed endless transmission belt 7 without a joint is fitted to the motor pulley 8 and the driven pulley 6a, thereby lowering the rotation of the shaft of the driving motor 9 and transmitting it to the upper shaft 3. Conventionally, the needle bar crank 10 is fixed to the other end of the u...

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PUM

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Abstract

An apparatus for adjusting a timing of a needle and a looptaker of a sewing machine provided at a zigzag sewing machine having an upper shaft for driving a needle bar, a lower shaft for driving a looptaker, a machine frame, and a timing belt for connecting and synchronizing the shafts includes a cam member including a first cam surface and a second cam surface, a first arm member and a second armmember supported by the machine frame and a first pulley and a second pulley mounted to the first arm member and the second arm member respectively and always contacting the timing belt, the first pulley following the first cam surface and the second pulley following the second cam surface.

Description

Technical field [0001] The present invention generally relates to a device for adjusting the timing of a needle and a shuttle of a sewing machine, which adjusts the timing when the hook of the shuttle in the sewing machine meets the needle. Background technique [0002] The conventional sewing machine disclosed in JP49-110450A includes an upper shaft driving a needle bar and a lower shaft driving a shuttle. The upper shaft is connected to a device for laterally moving the needle bar arm to control the width of the zigzag seam. A device for adjusting the timing of the needle and the shuttle is provided between the lower shaft and the shuttle (shuttle shaft). The lower shaft and the shuttle shaft are connected via a pulley and a belt, so that the rotation of the lower shaft is transmitted to the shuttle shaft via the belt. The belt is in contact with the four tension rollers, that is, with the two tension roller units. The sewing machine disclosed in JP49-110450A includes two te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B55/14D05B57/30
Inventor 石川均福田达则
Owner SINGER SOURCING LTD LLC
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