| 摘要 |
PROBLEM TO BE SOLVED: To completely finish a lock or a release operation even if a key switch is turned off while locking a pallet or releasing the lock. SOLUTION: Relays X1 and X2 for changing over between a normal and an inverse rotation of a motor 31, which drives a power cylinder for locking and releasing a lock bar, by contacts X1-1 and X2-1 are connected to a battery Ba via the key switch 51. A relay X5 excited to perform the locking operation or the releasing operation is connected in parallel to the relays X1 and X2. The contact X5-1a is connected in parallel to a series circuit between the key switch and a counterflow preventing diode D1. If the operator erroneously turns off the key switch 51, the contact X5-1a of the relay X5 is in an ON state, so that the excitation of the relay X1 or the relay X2 is retained to control the rotation of the motor 31. COPYRIGHT: (C)2003,JPO
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