Other

Hidekazu Hashimoto

Kazuoki Komiyama

Junichi Nakao

A punch unit ( ) is provided with: a punch ( ), which is reciprocally driven in a punching operation; and, a die ( ), which cooperates with the punch ( ) in punching a hole in a soft metal sheet (i.e., workpiece not shown). In this punch unit ( ): punch guides ( ) and the die ( ) are integrally formed into a punch block ( ); and a radial clearance between the punch ( ) and the die ( ) is set at a value of from 4 to 15% of a thickness of the soft metal sheet to be punched; and, the punch unit ( ) is further provided with a sheet hold-down means ( ) the sheet hold-down means ( ) functioning to hold down the soft metal sheet when the soft metal sheet is punched.

Punch unit for punching a hole in a soft metal sheet

A punch unit ( ) having a punch ( ) that is reciprocally driven in a punching operation; and, a die ( ) cooperating with the punch ( ) in punching a punch hole in a soft metal sheet. A cleaning means scrapes a soft metal sheet's fragment, when the fragment is stuck to the punch ( ), off of the punch ( ). The cleaning means scrapes the fragment by reciprocally moving the punch ( ) Further provided in the unit ( ) is a punch drive and control circuit ( ). The circuit ( ) enables the punch to be ( ) to perform lost motion at predetermined time intervals. Lost motion enables the punch ( ) to scrape the fragment of the soft metal sheet off a surface of the punch ( ). Consequently, the fragment of the soft metal sheet does not remain stuck to the punch ( ) in the punching operation.

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Shimane, Japan

Hidekazu Hashimoto