| 摘要 |
PURPOSE:To make screw fastening at several points in the same stage of processing, where the screw shall be able to take different levels, by furnishing a stopper driven by an air cylinder. CONSTITUTION:A driver holder 9 is to fix the driver body 6 and movable in the vertical direction. A fixed guide 10 includes a driver part to move this holder 9 vertically. A stopper plate 11 is fixed to the tip of a bit holder 7 movable on the body 6 in the vertical direction, wherein a rack 14 is meshing with a gear 15. The stopper 17 is rotatable through a pin 19, and swingable through the action of an air cyliner 20. When this cylinder 20 is put in operation, the stopper 17 begins swinging to cause the tip 21 of stopper 17 running against the gear 15, and the rack 14 is locked from vertical motion. Then the driver body 6 is sunk to allow commencement of screw fastening with the tip of the rotating bit. |
