A method and an apparatus are provided for marking a sheet-shaped workpiece using a marking tool. The marking tool is mounted in a punch holder of a punch press and a counter-support is fixed in place on a side opposite of a marking surface of the workpiece to be marked. The surface of the workpiece is marked by displacing the workpiece in its plane while engaging the marking tool with the workpiece. In one form, a support roller provides counter-support. In another form, an elastic element is cooperatively associated with the punch stroke of the punch press to translate an exactly defined contact pressure force between the tool tip and the workpiece to be marked.

Method and apparatus for marking workpieces

An adjustable punch assembly is provided for use at an indexable punching station in a turret punch press. The overall length of the punch assembly may be adjusted using a motor and pulley system that is also used for indexing the punch tool. Further, the punch assembly includes a quick disconnect connection between the punch driver and the punch tip that facilitates the changing of the punch tip.

Adjustable punch assembly

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).

Multiple tool for punch press

A self-aligning multi-tool (10) for use in a punch press having a ram (50). The multi-tool includes a housing (40) carrying a striker (44) and a magazine (12) bearing a plurality of circumferentially spaced tools (16) and rotatable with respect to the housing so as to bring a single desired tool into alignment with the striker (44). The housing has a striking surface (48) adapted to be engaged by the ram of a punch press and configured to rotationally lock to the ram when correctly rotationally aligned therewith to prevent the housing from rotating as the magazine is rotated. The housing is provided with at least one alignment pin (60) having a tapered cam surface (74) and positioned such that the ram will contact and cam against the tapered cam surface of the pin as the ram approaches the striking surface if the machine ram and the striking surface are rotationally mis-aligned so as to urge the housing to rotate into correct alignment with the ram to enable rotational locking therebetween.

Multi-tool alignment apparatus

A modular conversion unit for converting punching machines from single-punch to multiple-punch comprises an upper main cylindrical magazine (3) rotatably supported by a turret (1) of the punching machine and provided with a plurality of radial seats (4a-4e) for accommodating corresponding upper secondary cylindrical magazines (5a-5e), supporting a preset number of punches (6) surmounted by corresponding hammer elements (7a-7e) fitted so as to rotate, a corresponding lower main cylindrical die-holder magazine (8) accommodated so as to rotate synchronously and in alignment with said upper cylindrical magazine in a hollow seat (8a) formed in a worktable (2) of the punching machine and provided with a corresponding number of radial seats (9a-9e) for lower secondary die-holders (10a-10e) vertically aligned with the upper secondary magazines (5a-5e), each die-holder (10a-10e) being provided with a plurality of dies (11) whose number is equal to the number of the punches (6). The unit also comprises a first motor (12) for producing a controlled rotation of the upper main cylindrical magazine (3) with respect to the turret (1), a second motor (13) which intervenes alternatively and actuates, with a controlled rotation, the hammer elements (7a-7e) with respect to the corresponding secondary cylindrical magazines (5a-5e), and a third motor (14) for the controlled rotation of the lower main cylindrical magazine (8) with respect to the seat synchronously with the upper main magazine (3).

Modular unit for converting punching machines from single-punch to multiple-punch

A punch assembly which may be provided at a punching station in a turret punch press. The punch assembly includes a striker body having a solid portion, and a punch carrier which carries a plurality of individual punches. A selectively actuable stop holds the striker body stationary, allowing the punch holder to be rotated so that a predetermined one of the plurality of punches will underlie the solid portion of the striker body. Afterwards, the entire punch assembly may be rotated to a variety of angular orientations. At any of these orientations, the ram may be actuated to cause the punch to extend downwardly below the punch assembly and through a sheet of material. The rotation of the punch assembly to different orientations allows a single punch to be used to punch holes of the shape but with differing angular orientations. The die holder receives a plurality of corresponding dies having openings therein corresponding to the punches. The die holder is rotatable to maintain constant alignment between corresponding punches and dies.

Indexable multi-tool for punch press

A die retaining means for use in a punch press, with die carrier (244) mounted for rotation in said punch press, with a plurality of die buttons (240) carried on said die carrier, the die buttons having openings that are non-circular, also having key slots (248) in the dies engageable with said keys (246) to hold said die buttons in selected orientations, said keys being reversible between engaging and non-engaging positions.

Die retaining means for a punch press

A retaining means for stripper buttons (151) in a punch press punch assembly with a stripper guide means (150) for receiving a plurality of stripper buttons (151) at one end of said guide means with a retaining ring means (226) which is surrounding said one end of said guide means, said retaining ring means having spaced retaining flanges (228) for alternatively overlying a portion (222) of said stripper buttons or being spaced between said stripper buttons depending on the angular relationship of said retaining means and said guide means and having detent means (230). The stripper buttons (151) are held on the indexable station by the rotating ring for easy removal and the die buttons are held in a die carrier to rotate synchronously with the indexable station.

Retaining means for stripper buttons in a punch press

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Indexable multi-tool for punch press

Die retaining means for a punch press

Retaining means for stripper buttons in a punch press