PURPOSE: To reduce variation of tension at the starting time of a looper and variation of tension due to ELETIE (electric tie) control at the time of adjustable speed by providing a frictional torque compensating device and an ELETIE control gain adjusting device in a loop storage facility of a continuous processing line.
CONSTITUTION: At the starting time of the looper, a compensating quantity for frictional torque is outputted from the frictional torque compensating device 12 to a minor electric current control amplifiers 19, 20 through amplifiers 17, 18 for electric motors 21, 22. A positional deviation to the looper driven by the reference electric motor 21 is amplified by a position amplifier 27 through position signals due to position detectors 25, 26, and, at the shutdown time of the looper, the gain for shutdown/adjustable speed is changed over through a shutdown gain 29 for the shutdown and an adjustable speed gain 30 for the adjustable speed time and the compensating quantity for frictional torque is outputted from a close contact 28 to a high speed amplifier 16. Variation of tension at the starting time of the looper and variation of tension shown when speed is changed under ELETIE control can be reduced effectively.
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