| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability and durability of a gun arm loading and unloading mechanism. SOLUTION: An arm loading/unloading mechanism 3 is arranged in a gun body 1, a connecting plate is fixed at the rear end of the gun arm 2, inserted into the mechanism, and clamped by the advancing movement of a positioning pin P and a cam 5 provided in the mechanism; also, an ejector 14 is designed to forcedly retract the positioning pin P from the connecting plate at the rear end of the gun arm 2 by the retreating motion of the cam 5. As a result, the loading/unloading operation can be surely carried out in the connecting part between the gun arm 2 and the gun body.
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