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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: 2008-09-24
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] A first embodiment of the present invention will be described below with reference to the drawings. Figure 1 and 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 , 4 fixed to the frame 2 . The hand wheel 5 and the pulley 6 are fixedly mounted on one end of the upper shaft 3 . The pulley 6 includes a larger-diameter driven pulley 6a and a smaller-diameter timing pulley 6b (ie, a first timing pulley). A drive motor 9 is mounted to the frame 2, and a motor pulley 8 is fixedly mounted to an output shaft of the drive motor 9 so as to rotate. A jointless closed-loop transmission belt 7 is fitted to the motor pulley 8 and the driven pulley 6 a, thereby reducing and transmitting the rotation of the shaft of the drive motor 9 to the upper shaft 3 . Conventionally, a needle bar crank 10 is fixed to the other end of the upper shaft 3 so that the needle bar 12...

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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 arm member 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 an apparatus for adjusting the timing of the needle and shuttle of a sewing machine, which adjusts the timing at which the hook of the shuttle in the sewing machine meets the needle. Background technique [0002] A 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 zigzag seam width. 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 by 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 four tensioning pulleys, that is, two tensioning pulley units. The sewing machine disclosed in JP49-110450A includes two tensio...

Claims

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Application Information

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