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RESEARCH PAPERS

Transient Torque Produced in Arm Shaft of an Industrial Sewing Machine

[+] Author and Article Information
N. Muramatsu

Nagoya Works, Mitsubishi Electric Corporation, Nagoya, Aichi, Japan

J. Mech. Des 112(4), 538-543 (Dec 01, 1990) (6 pages) doi:10.1115/1.2912643 History: Received November 01, 1989; Online June 02, 2008

Abstract

This study considered the effects of needle penetrating force, needle thread tightening tension, and pressing force of the presser foot on torque produced in the arm shaft of an industrial sewing machine. The results obtained are as follows. (1) Penetrating force, especially the initial triangular wave fluctuation, induces noticeable transient vibration in torque. (2) The penetrating force is considerably more transient than the pressing force. The time ratio of the duration of the penetrating force to the natural period of the motion system is close to 1. (3) Consequently, when estimating torque, it is necessary that the arm shaft of the thread take-up lever and needle bar mechanism motion system be considered as elastic. On the other hand, the arm shaft of the feed mechanism motion system can be treated as a rigid body.

Copyright © 1990 by The American Society of Mechanical Engineers
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