ELECTRICALLY DRIVEN PRESS MACHINE

WIPO Patent Application WO/2004/080703

A1

An electrically driven press machine has a frame body (4), a slider (5) that has an upper die (6) installed to it and slides on struts (3), a connection mechanism for vertically moving the slider (5) through a ball screw shaft (19) rotated in forward and reverse directions by an AC servomotor (9), a lower die (22), a stepless speed changer (10) that is provided between the AC servomotor (9) and the ball screw shaft (19), a pulse scale (23) for detecting the position of the upper die (6), and a control device (25) that, based on a position signal detected by the pulse scale (23), sets the AC servomotor (9) to a torque-added mode in a press position period where the upper die (6) presses an object (24) to be pressed placed on the lower die (22), and rapidly lowers and raises the upper die (6) through the switching of the stepless speed changer (10) in a non-pressing period that is the period other than the press position period.

FUTAMURA SHOJI (JP)
UNNO KEIZO (JP)

PCT/JP2004/001330

September 23, 2004

February 09, 2004

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INST TECH PRECISION ELECT (JP)
FUTAMURA SHOJI (JP)
UNNO KEIZO (JP)

B30B15/00; B30B1/18; B30B15/14; F16H25/22; F16H61/662; (IPC1-7): B30B1/18; B30B15/14; F16H9/20

JP2002160099A	2002-06-04
JPH11221700A	1999-08-17
JP2001062597A	2001-03-13
JP2002537529A	2002-11-05
JP2002144098A	2002-05-21
JPH06246500A	1994-09-06

Morita, Hiroshi (Sankyo Central Plaza Building 5F 11-8, Nishi-nippori 5-chome, Arakawa-k, Tokyo 013ku-Tokyo, JP)

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