| 摘要 |
PURPOSE:To prevent the occurrence of noise, by providing a cam pressing a nail retaining spring at film scraping in synchronizing with the operation of nail feed cam, and removes the energy of the nail retaining spring at returning of the feed nail. CONSTITUTION:A face cam 5a consists of a higher part 5b, lower part 5c and gentle slopes 5d between said parts, and an end 4a of nail retaining spring 4 is in contact with the surface of said face cam, and the spring 4 moves up and down toward thrust direction of a shaft along the surface of said face cam through the rotation of a feed cam 5. The nail retaining spring 4 energizes a feed nail member 3 so that a nail 3a can scrapes a film 1 surely. Thus, snap sound and butt sound which have been problems, are decreased by the end of nail retaining spring and the face cam, allowing to reduce noise remarkably with a simple constitution. |
