| 摘要 |
PURPOSE:To produce German type hook with less cost-up by pinching the coil winding start part at twisting position with stopping once of the feeding of wire rod in the stage, by bending two hook parts to the angle >=90 deg. and by utilizing the twist of the wire rod and the restoring force of the spring. CONSTITUTION:The tip of the first hook is produced by feeding out at the prescribed speed the wire rod pinched by feeding rollers 15, 19. A semicircular hook is formed by revolving without lifting a rocker arm 48 by cam 5 and by abutting the wire rod with a forming tool 50 coming out to the front face of a delivery hole 42. The straight line part following the first hook is produced by separating from the wire rod the forming tool 50 with its retreating by the cam 5 and by advancing the wire rod straight. The initial coil is formed with 1/4 winding by abutting the wire rod with the advance of the tool 50 by the cam 5 and simultaneously the wire rod is made like being twisted at the position slipped off from the coil forming face as well as stopping once the feeding coil of the wire rod. The position of coil winding start is pinched by forming tool 53 and backing tool 54, the hook is bent >=90 deg. to the side of the forming face of the coil by forming tool 47, then the coil part of the body is formed and the second hook of the straight line part is bent after the formation.
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