Rotary work lifter and working machine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHiroaki Yamaoku
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Abstract
The invention is provided with means for detecting a situation of rotating a rotary work lifter at any time, and a determining portion for determining whether operation of the rotary work lifter is to be stopped by a state of rotating the rotary work lifter detected by the means, thereby, operation of the rotary work lifter can be stopped when rotation of the rotary work lifter is interrupted by pinching a work piece or the like between the rotary work lifter and a working table or the like, or when the rotation is interrupted by some other influence. Therefore, the rotary work lifter, the working table or the like can be prevented from being finally destructed by continuing to generate a torque by a drive source even after interrupting rotation of the rotary work lifter as in a background art.
Claims27
A rotary work lifter characterized in a rotary work lifter having a drive source an operation of which is controlled by a drive source control portion, driven by the drive source and enabling to carry a work mounted on a working table, said rotary work lifter comprising:
- position detecting means for detecting a rotational position of the rotary work lifter;
- a position determining portion for determining whether the rotary work lifter reaches a predetermined position by position information detected by the position detecting means;
- speed detecting means for detecting a rotational speed of the rotary work lifter;
- and
- a speed determining portion for outputting a signal of stopping the rotary work lifter to the drive source control portion when a speed of the rotary work lifter becomes equal to or smaller than a predetermined speed by speed information detected by the speed detecting means.
Dependencies are inferred from the claim text.