Ring spinning machine with individual spindle drives

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(11)

EP 0 999 298 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.09.2000 Bulletin 2000/36

(43)	Date of publication A2:
	10.05.2000 Bulletin 2000/19

(21)	Application number: 99117969.8

(22)	Date of filing: 16.09.1999

(51)	International Patent Classification (IPC)⁷: D01H 1/244, H02H 7/085

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

05.11.1998 JP 31508898

(71)	Applicant: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
	Aichi-ken (JP)

(72)	Inventors:
	Tsuboi, Masayoshi Kariya-shi, Aichi-ken (JP) Shinozaki, Yutaka Kariya-shi, Aichi-ken (JP) Uematsu, Tatsuya Kariya-shi, Aichi-ken (JP) Odachi, Yasuharu Kariya-shi, Aichi-ken (JP)

(74)	Representative: HOFFMANN - EITLE
	Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)

(54)	Ring spinning machine with individual spindle drives

(57) In a spindle driving apparatus for a ring fine spinning machine, a plurality of spindles have dedicated synchronous motors, inverters and control circuits individually connected thereto, and the control circuits are connected to a common dc power supply. Each control circuit outputs a PWM signal to the corresponding inverter, monitors a PWM duty, detects a drastic change in the driving condition of the corresponding spindle as a result of a change in the PWM duty, and stops the corresponding synchronous motor through that inverter.

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