| 摘要 |
PROBLEM TO BE SOLVED: To considerably reduce the cost by simplifying the structure of a tray locking mechanism. SOLUTION: A locking device 3 comprises a lock plate 31 to be engaged with a hook 2 of a tray 69, and a support member 32 to support the lock plate 31 in a tiltable manner between the regular lock position to engage the lock plate with the hook 2 of the tray 69 and the unlock position to disengage the lock plate from the lock position. An unlocking device comprises a working member 41 which is disposed turnably with its center of turning set as a carrying truck and its driving mechanism, and these members are formed of common parts of a tray transfer means on the carrying truck.
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