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sewing machine

A sewing machine and machine base technology, which is applied to sewing machine components, sewing machines, and ferrule mechanisms for sewing machines, etc., can solve the problems of large vibration of sewing machines and achieve the effect of reducing vibration.

Inactive Publication Date: 2015-08-05
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large and heavy motor located above, the sewing machine vibrates a lot during operation

Method used

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Embodiment Construction

[0019] Embodiments of the present invention will be described. Directions (front and rear, left and right, and up and down) used in the following description are indicated by arrows in each figure.

[0020] Such as figure 1 As shown, the sewing machine 1 has a machine base 2 , a column 3 and a machine arm 4 . The stand 2 has a rectangular top plate 2a long in the left-right direction. The pillar 3 extends upward from the right end of the top plate 2a. The machine arm 4 extends leftward from the top of the pillar 3 . The rear sides of the strut 3 and the arm 4 are covered by a rear cover 6 . The right side of the pillar 3 is covered by the right cover 7 . The rear cover 6 and the right cover 7 can be detached.

[0021] The machine frame 2 has a needle plate 20 at the left end portion of the top plate 2a. Such as figure 2 As shown, the frame 2 supports the lower shaft 22 and the hook shaft 23 parallel to each other front and back under the top plate 2a. The lower shaft...

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PUM

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Abstract

The invention provides a sewing machine. The sewing machine is provided with an upper shaft belt wheel on an upper shaft inside a machine arm, a lower shaft inside a machine base is provided with a lower shaft belt wheel, and a rotating shuttle shaft inside the machine base is provided with a rotating shuttle shaft belt wheel. The upper shaft belt wheel, the lower shaft belt wheel and the rotating shuttle belt wheel are connected through a transmission belt. A motor is arranged inside the machine base and drives with small torque the rotating shuttle which rotates at high speed. The upper shaft belt wheel, the lower shaft belt wheel and the rotating shuttle belt wheel are belt wheel with teeth. The transmission belt is a double-tooth belt having inner teeth on the inner circumference and outer teeth in the periphery. The inner teeth of the transmission belt engage with the teeth in the periphery of the upper shaft belt wheel and the teeth in the periphery of the lower shaft belt wheel, and the outer teeth of the transmission belt engage with the teeth in the periphery of the rotating shuttle shaft belt wheel, thereby reliably transmitting rotation of the rotating shuttle shaft to the lower shaft and the upper shaft.

Description

technical field [0001] The invention relates to a sewing machine in which an upper shaft, a lower shaft and a hook shaft are connected by a transmission belt. Background technique [0002] The sewing machine has an upper shaft supported in a machine arm, a lower shaft supported in a bed, and a hook shaft. The upper shaft rotates inside the machine arm and drives the needle and thread take-up lever. The lower shaft and the hook shaft rotate in the frame. The lower shaft is used to drive the feed dog, and the hook shaft is used to drive the hook. The needle holds the upper thread and rises and falls at the front end of the machine arm. The thread take-up lever rises and falls synchronously with the needle. The thread take-up lever loosens the upper thread held by the needle when it is lowered, and tightens the upper thread when it is raised. The cloth feeding teeth reciprocate along the front and rear direction, and feed the cloth on the needle plate to the rear. The hoo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B57/38
Inventor 山田泰史加藤勉
Owner BROTHER KOGYO KK