Dynamics of Industrial Sewing Machine

• Published in: Journal of the Japan Society of Precision Engineering Vol. 51; no. 2; pp. 393 - 399
• Main Author: MURAMATSU, Naoki
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society for Precision Engineering 1985
• Subjects: dynamics; feed forked connection; feed lifting rock shaft connecting rod; feed mechanism; feed regulator; feed reverse lever; industrial sewing machine; PV value; torque
• ISSN: 0374-3543
• DOI: 10.2493/jjspe1933.51.393

This paper deals with a method of estimating the force by dynamics on the feed mechanism of industrial sewing machine. As a result, the theoretical values obtained by solving the simultaneous linear motion equations with 24 unknowns agree with the experimental values. Especially, as for the force Fl produced in the feed forked connection lever, the followings are made clear. (1) The peak values of left and right component are produced at a nearly neutral position of the lever equivalent length l. (2) The fluctuation of Fl is accompanied with the higher harmonic of about 500 Hz by natural vibration of the transfer system in vertical direction to the moving plane during compression of the axial force Ff. In addition, as for the torque produced in the feed regulator, the followings are made clear. (3) During forward feed, this torque is the sum of the torques Ts due to spring and Tr due to inertia force. Therefore the set condition of the feed regulator is stable. (4) During backward feed, this torque is the difference. Therefore the feed reverse lever should be kept to be stable by the force exceeding the torque difference.