| 摘要 |
PURPOSE: To attain clamping prevented from comming-off by sensing the magnitude of any slippage between a load and a load-engaging surface during a period when the engaging surface grips the load to set properly variably gripping force via an actuator in direct response to the sensed magnitude of the slippage. CONSTITUTION: Respective clamp arms 20, 22 are oscillated around respective turning pins 26, 28 by extending and retreating selectively respective hydraulic cylinders 30, 32, and grip a cylindrical paper roll 12 between load-engaging surfaces 14, 16 pivoted in tips of clamp arms 20, 22. The respective hydraulic cylinders 30, 32 are drive-controlled via a hydraulic circuit in response to an operator-controlled valve. A slippage sensor including a load-contacting roller 124 projected through an opening within the load-engaging surface 14 is provided in this case. The magnitude of gripping force stored preliminarily in a controller and set in various levels to reduce a slippage is determined based on a slippage- sensed signal to control the hydraulic cylinders 30, 32 in response to the determined magnitude.
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