System for detecting malfunction by monitoring torque of a trans

Details System for detecting malfunction by monitoring torque of a trans System for detecting malfunction by monitoring torque of a trans

1994-12-29

1997-04-15

Wysocki, Jonathan

Electricity: motive power systems

Constant motor current, load and/or torque control

361 23, H02P 700

Patent

active

056212895

ABSTRACT:
Safe operation of a transfer device on a press is provided by the present invention. In the transfer device in which the drive of servo motors in the drive units 1, is caused to be synchronized with the operation of the transfer press itself by positionally controlling motions of beams through servo controllers a torque value of a specific transfer pattern actually measured under normal operation is established to be a reference torque value of the transfer pattern; a torque allowance is calculated by defining the upper and lower limit torque values by adding or subtracting a preliminarily set deviation value to or from the reference torque value in a CPU of a control unit, and the torque allowance is stored in the control unit. The actual torque value is compared with the torque allowance to acknowledge whether or not the actual torque value is within the stored torque allowance in later forming operation using the same transfer pattern. As a result, malfunctions such as the drop out of any part, catching of any foreign matter, poor lubrication, idle running of the servo motors, all of which is impossible to prevent by mere conventional positional control of the beams, etc. are instantaneously detected.

REFERENCES:
patent: 3887855 (1975-06-01), Klimo
patent: 3962910 (1976-06-01), Spyridakis et al.
patent: 4066942 (1978-01-01), Bardwell et al.
patent: 4445075 (1984-04-01), Fry
patent: 4918744 (1990-04-01), Shimizu
patent: 4959797 (1990-09-01), McIntosh
patent: 5014793 (1991-05-01), Germantown et al.

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