| 摘要 |
PROBLEM TO BE SOLVED: To stop supply of a compressed gas to a bullet side passage with a simple structure. SOLUTION: In a cylinder block 114, a loading sleeve 115 is disposed at a loading packing side 108 portion and a cylinder portion 116 is disposed at a gun rear end side portion. A bullet shooting ventilation hole 117 is formed in the loading sleeve 115, while a blow back ventilation hole 119 is formed in the cylinder portion 116. In an air supply passage 126, a bullet side passage 127 which is opened such that it faces the bullet shooting ventilation hole 117 of the loading cylinder 115 in an opposed manner and a cylinder side passage 128 which faces the blow back ventilation hole 119 are formed in a bifurcated form. A changeover valve 134 is provided at the bifurcated position of the air supply passage 126 and such valve 134 is constituted such that when the gas pressure of a compressed gas which enters the bullet side passage 127 becomes a negative pressure relative to the gas pressure of a compressed gas which enters the cylinder side passage 128, the changeover valve 134 is rotated with one end thereof used as a rotating end so as to close the bullet side passage 127. |
