| 摘要 |
Sheet-metal parts (10), in particular tear-open can parts, can be moved cyclically in series through a welding station (19) by means of a sheet-metal conveyor (15) and fixed in a defined position (17) in the welding station (19) by means of a positioning device (17). Using a punch (60), a prepunched tab (12) can be punched out of a sheet-metal strip (58) over one of several receptacles (52) on a tab conveyor (18). The receptacles (52) can be moved successively out of the working region of the punch (60) into the welding station (19), thereby allowing the tabs (12) to be laid against a respective sheet-metal part (10) in the welding station (19) in time with the working cycle of the sheet-metal conveyor (15). Positioned ahead of the punch (60), for the purpose of punching out the tabs (12), is a pre-punching apparatus (82) which punches markings (84) into the sheet-metal strip (58) at fixed distances from the tabs (12). Arranged between the pre-punching apparatus (82) and the punch (60) is a driving member (83) which detects the markings (84) of the sheet-metal strip (58) and is connected by a gear mechanism (86) to the tab conveyor (18). The punch (60) is connected to a centring device (90) which, during the punching out of a tab (12), engages in at least one adjacent marking (84) of the sheet-metal strip (58). In this way, the tabs (12) are positioned with particular accuracy in relation to the respectively associated sheet-metal part (10). <IMAGE>
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