DEVICE FOR HOT-FOIL STAMPING

Abstract

A device for hot-foil stamping on printing materials includes a heated stamping cylinder, a counterpressure cylinder, and a device for providing stamping foil. The device for providing stamping foil guides the stamping foil between the stamping cylinder and the counterpressure cylinder in a direction tangential to the cylinders. The device for providing stamping foil has an adjustable guide element that is disposed downstream of the stamping cylinder and of the counterpressure cylinder for guiding the stamping foil. The hot-foil stamping device advantageously allows the stamping quality to be optimized.

Claims

1. A device for hot-foil stamping on flat printing material, the device comprising: a heated stamping cylinder and a counterpressure cylinder; a device for transporting the printing material and a device for providing a stamping foil, the printing material and the stamping foil defining a removal angle therebetween; said device for providing the stamping foil guiding the stamping foil between said stamping cylinder and said counterpressure cylinder in a direction tangential to said stamping cylinder and to said counterpressure cylinder, and said device for providing the stamping foil including at least one adjustable guide element for guiding the stamping foil; and said at least one adjustable guide element being disposed downstream of said stamping cylinder and of said counterpressure cylinder, said at least one adjustable guide element having a position, and an adjustment of said position resulting in a modification of said removal angle.

2. The hot-foil stamping device according to claim 1, wherein said at least one adjustable guide element is pivotable about an axis of rotation.

3. The hot-foil stamping device according to claim 1, wherein said at least one adjustable guide element is movable along a linear axis.

4. The hot-foil stamping device according to claim 1, wherein said device for providing the stamping foil includes an actuator for carrying out the adjustment of said position of said at least one adjustable guide element.

5. The hot-foil stamping device according to claim 4, wherein said actuator is an electric motor.

6. The hot-foil stamping device according to claim 5, which further comprises a control unit for controlling said actuator.

7. The hot-foil stamping device according to claim 6, wherein said control unit has a memory for saving job-dependent settings of said at least one adjustable guide element.

8. The hot-foil stamping device according to claim 6, wherein said control unit has a memory for saving and accessing speed-dependent settings of said at least one adjustable guide element.

9. The hot-foil stamping device according to claim 1, wherein said at least one adjustable guide element is a guide roll, a guide roller, a round brush, a stationary profile part, a guide plate, a guide brush, a guide cushion or an air cushion roller.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0018] FIGS. 1a, 1b and 1c are diagrammatic, side-elevational views of a hot-foil stamping device of the invention with different foil removal angles;

[0019] FIG. 2 is a side-elevational view of an alternative hot-foil stamping device including a motor adjustment;

[0020] FIG. 3 is a side-elevational view of an alternative hot-foil stamping device including an alternative adjustment; and

[0021] FIG. 4 is a side-elevational view of alternative guide elements.

DETAILED DESCRIPTION OF THE INVENTION

[0022] Referring now in detail to the figures of the drawing as a whole, there is seen a device 100 for hot-foil stamping, which is also referred to as a hot-foil stamper. The hot-foil stamper 100 includes a stamping cylinder 1 and a counterpressure cylinder 2 interacting therewith. A device 3 for providing a stamping foil 1001 guides the stamping foil 1001 through a stamping nip formed between the cylinders 1, 2. A printing material 1000 is likewise transported through the stamping nip between the cylinders 1, 2 in a direction of transport T. The printing material 1000 is guided in a direction tangential to the stamping cylinder 1 and the counterpressure cylinder 2, at least on the exit side of the stamping nip. Color and/or metal particles are transferred from the stamping foil 1001 to the printing material 1000 in the stamping nip. For this purpose, the stamping cylinder 1 may carry a (non-illustrated) stereotype or clich and may have a (non-illustrated) heating element for heating the stereotype. The device 3 for providing the stamping foil 1001 includes an adjustment unit 10 for carrying out an adjustment movement v, v, v of guide rolls 4 or a guide roller 4.

[0023] The device 3 for providing the stamping foil 1001 prescribes different removal angles in FIGS. 1a, 1b, and 1c. The removal angle is formed by the plane of transport of the printing material 1000 and the stamping foil 1001 running along guide rolls 4 or a guide roller 4 or a guide 4. The modification of the removal angle is achieved by the fact that the stamping foil guide rolls 4 or guide roller 4 provided in the device 3 for providing the stamping foil 1001 pivot about an axis of rotation 5 with a lever embodied as a rotary arm 7 and by using a rotary shaft 6. The pivoting adjustment movement v modifies the position of the point of contact between the guide roll 4 or guide rollers 4 and the stamping foil 1001, thus changing the removal angle and an area of contact k between the printing substrate 1000 and the stamping foil 1001. A modification of these parameters allows the stamping quality to be influenced and optimized.

[0024] As is indicated in FIG. 2, the device 3 for providing the stamping foil 1001 of the hot-foil stamper 100 may include an electric motor 8 for driving the adjustment movement v of the guide rolls 4 or guide roller 4. The electric motor 8 is actuated by a control unit or controller 9 in which settings may be saved. FIG. 2 also indicates a device 11 for transporting printing material 1000.

[0025] The embodiment of the hot-foil stamper 100 shown in FIG. 3 includes a modified adjustment unit 10 and guide rolls or a guide roller 4. Rather than a pivoting movement v, a vertical adjustment movement v or a horizontal adjustment movement v of the guide rolls or guide roller 4 is envisaged.

[0026] FIG. 4 illustrates alternative embodiments of the guide element 4, that is the guide rolls or guide roller 4.