Method of punching damper with use of hollow punch, punching apparatus for the method, and attaching apparatus with the punching apparatus

摘要

A method punches a damper out from a damper material that is detachably attached on a flexible exfoliative member through an attaching surface of the damper material with use of a hollow punch. The method includes steps of setting the damper material on a supporting surface, positioning a projection part between the exfoliative member and the supporting surface, and punching the damper out from the damper material by cutting the damper material around the projection part by the hollow punch without punching the exfoliative member.

主权项

1. A method of punching a damper out from a damper material that is detachably attached on a flexible exfoliative member through an attaching surface of the damper material with use of a hollow punch having a tooth portion at a front end of the punch, comprising the steps of:
setting the damper material on a supporting surface so that the damper material is supported with the supporting surface through the exfoliative member, the supporting surface having a first part positioned inside a punching range of the punch and a second part positioned outside the punching range and adjoining to the first part so that the second part is on a same level with the first part; positioning a projection part with respect to the first part of the supporting surface between the exfoliative member and the first part of the supporting surface; and punching the damper out from the damper material by cutting the damper material around the projection part by the hollow punch without punching the exfoliative member, while the projection part is positioned between the exfoliative member and the first part of the supporting surface, and a clearance being larger than a thickness of the exfoliative member is kept between the tooth portion and the projection part in a lateral direction perpendicular to a punching direction along which the punch punches out the damper, so that a front end portion of the hollow punch passes through the damper material and at least contacts with the exfoliative member to bend the exfoliative member away from a cut edge of the punched damper around the projection part when said cutting, to promote separation between the exfoliative member and the punched damper and hold the punched damper on a hollow inner surface of the punch.