Driving device for cutter of sewing machine

Abstract

The present invention provides a knife driving device of sewing machine. The device is installed with a transmission cylinder which penetrates the head lower wall at the bottom of sewing machine and is supported with a mode that the transmission cylinder can rotate around the central shaft. The transmission cylinder is embedded with a supporting bush of compression lever. The upper part of transmission cylinder positioned at the inner side of head part is connected with a knife pendulum shaft at the inner part of sewing machine arm. The lower part of transmission cylinder positioned outside the head part is installed with a movable blade. The reciprocating rotation of blade pendulum shaft at the inner part of sewing machine arm is transmitted to the transmission cylinder. Furthermore the reciprocating rotation of transmission cylinder is transmitted to a movable knife on the presser feet for reciprocating the movable blade. The inner part and outer part of head part are sealed with a sealing component which is installed at the internal circumstance and periphery of transmission cylinder. The transmission from the knife pendulum shaft to the movable knife is realized without damaging the sealing in and outside the head part. Furthermore the high-speed operation is realized.

Description

technical field [0001] The present invention relates to a knife driving device, which reciprocates a movable knife provided on a presser foot through transmission from the inside of a sewing machine arm. Background technique [0002] The Feed-Off-Arm Sewing Machine For Flat Seaming recorded in Japanese Patent Publication No. 7-57272 (Examined Japanese Patent Publication No. 7-57272 (1995)) is a form of industrial sewing machine . The buried clip lockstitch sewing machine includes a narrow cylindrical sewing machine table extending in one direction at the lower part of the sewing machine frame, and a sewing machine arm extending in a different direction from the sewing machine table at the upper part of the sewing machine frame. [0003] The feed driving mechanism (Feed Driving Mechanism) is installed inside the sewing machine table, which is used to feed the cloth into the lower part of the needle plate (Stitch Plate) set above the end part; and the looper driving mechanism...

AI Technical Summary

Problems solved by technology

[0010] However, the conventional lockstitch sewing machine has an opening provided on the front of the head to accommodate the above-mentioned transmission parts. Since it is difficult to seal the opening without hindering the swing of the transmission parts, it is impossible to drive the needle bar that moves the needle up and down. Mechanisms and other mechanisms installed in the head are well lubricated, which hinders the realization of high-speed operation

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