Title:
BRAKE CONTROL SYSTEM FOR GRAVITY SHAFTS
Document Type and Number:
WIPO Patent Application WO/1990/007737
Kind Code:
A1
Abstract:
A brake control system for gravity shafts that controls the brakes of gravity shafts of a CNC machine tool. The stop of control for the gravity shafts is notified from CNC to PC (programmable controller) (S1). PC sends a signal to the machine side to operate the brake (S3). After a predetermined brake operation completion time has passed, CNC interrupts the exciting current from flowing to the servo motor (S7). The predetermined time is slightly longer than the time of from a moment at which CNC notified the stop of control of the servo motor to a moment at which the brake locks the gravity shaft. This makes it possible to prevent the gravity shafts from falling or to prevent any shock upon the gravity shafts.
Inventors:
SASAKI TAKAO (JP)
MURAKAMI KUNIHIKO (JP)
HOSOKAWA MASAHIKO (JP)
MURAKAMI KUNIHIKO (JP)
HOSOKAWA MASAHIKO (JP)
Application Number:
PCT/JP1989/001165
Publication Date:
July 12, 1990
Filing Date:
November 15, 1989
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
G05B19/19; G05B19/414; G05B19/416; (IPC1-7): G05B19/18; G05B19/19
Foreign References:
| JPS61224006A | 1986-10-04 | |||
| JPH0663619A | 1994-03-08 | |||
| JPS59153209A | 1984-09-01 |
Other References:
See also references of EP 0401378A4
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