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Title:
CONTROL METHOD AND CONTROLLER FOR SCREW TIGHTENER
Document Type and Number:
WIPO Patent Application WO/2001/098034
Kind Code:
A1
Abstract:
A control method for a screw tightener having an electric motor as a rotation drive source wherein the motor generate a pulse-like output torque. The actual torque TQ is measured at a specified time interval. If it does not exceeds the maximum torque measured before, the output torque is controlled to be maintained. If the measured torque exceeds the maximum torque, the output torque is controlled to increase by a specified amount. When the increased torque reaches a desired level TQJ, the motor is stopped.

Inventors:
Ito, Takaya c/o ESTIC CORPORATION 2-5-9 (Hashibahigashino-cho Moriguchi-shi, Osaka, 570-0031, JP)
Application Number:
PCT/JP2001/004920
Publication Date:
December 27, 2001
Filing Date:
June 11, 2001
Export Citation:
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Assignee:
ESTIC CORPORATION (2-5-9, Hashibahigashino-cho Moriguchi-shi, Osaka, 570-0031, JP)
Ito, Takaya c/o ESTIC CORPORATION 2-5-9 (Hashibahigashino-cho Moriguchi-shi, Osaka, 570-0031, JP)
International Classes:
B25B23/14; B25B23/147; (IPC1-7): B25B23/14; B25B23/147
Attorney, Agent or Firm:
Kubo, Yukio (Shin Osaka Chisan Building 1-26, Nishinakajima 7-chome Yodogawa-ku Osaka-shi, Osaka, 532-0011, JP)
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