Importance

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Abstract

A multiple tool is disclosed wherein during a punching process by a predetermined punch, a workpiece is not damaged by other punches not used therein. A multiple tool is mounted on a rotatable holder (7) supported in a freely rotatably driven manner on a holder body (3) such as an upper turret. The multiple tool includes a punch holder (231), and a plurality of punches (241) supported in a vertically movable manner on the punch holder, and a striker plate (261) provided in the punch holder (231) in a rotatable and vertically movable manner relative to the punch holder (231). The striker plate is formed (a) on a lower surface thereof with a peripheral groove (271) for engaging the heads of the punches, and (b) above a predetermined location along the peripheral groove with a striker section (273) for selectively striking one of the punches on the punch holder, and (c) above a plurality of predetermined locations along the peripheral groove with through-holes (271H) for allowing the heads of the punches other than the punch struck by the striker section to move upward relative to the striker plate during a punching process by the punch struck by the striker section. The multiple tool further includes a punch head holder (255) provided above a striker plate (261) so as to be vertically movable relative to the striker plate and to be prevented from rotating relative thereto. A backup pin (275) is provided in the punch head holder at a position above each through-hold (271H), so that the head of each punch is pressed downward by a lower end of the backup pin (275). A pressure spring (279) is provided between the punch head holder and a backup pin for urging the backup pin downward. A holder spring (249) is provided between the punch guide (253) and the punch (241), for urging the punch upward. The spring constant of the holder spring (249) is greater than the spring constant of the pressure spring (279).

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First Claim