DE102012219663B4 - Clock drive for film transfer device and method for performing a cold foil transfer - Google Patents

Abstract

Device for transfer of imaging transfer layers from a carrier film to printing sheets at least with an applicator (1) for imagewise coating of the printed sheets with an adhesive and with a coating module (2) for transferring the transfer layers to the printing sheet in a transfer nip (6) between an impression cylinder (4) and a press roll (3), wherein the transfer film (5) with the transfer layer in contact with the printing sheet is feasible together with this through the transfer nip (6) and transferring transfer layers imagewise onto the printing sheet and with a device for feeding the transfer film (5) to the coating unit (2) and to the removal of the coating unit (2) with a drive for moving the transfer film in the working direction, wherein the film feed of the transfer film (5) is controllable by means for film guide such that the transport of the transfer film (5) is then stopped when in Transf (6) of the coating unit (2) no transfer of a transfer layer takes place on a printed sheet, characterized in that the transfer film (5) are associated with controllable conveying devices for braking and accelerating in time with the processing of the film transfer, wherein the conveying devices (33, 37) the transfer film web (5) guide and drive on one side without contact and that the conveying devices (33, 37) assigned to a transfer area in front of the transfer nip (6) or assigned respectively to the transfer area before and after the transfer nip (6).

Description

The invention relates to a device for transferring imaging layers from a carrier film to printing sheet according to the preamble of patent claim 1 and to a method for carrying out a cold foil transfer according to the preamble of patent claim 8.

It is from the EP 0 569 520 B1 make known metallic layers on printed sheets by means of a film transfer process. It is shown a sheet processing machine with a coating module. In a first printing unit, an adhesive pattern is applied, for example, in a planographic printing process. In the following this printing unit coating module with a counter-pressure cylinder and a press roller, a film guide is provided, in which a transfer sheet from a film supply roll through a transfer nip of the coating module and wound on the outlet side of the coating module. The transfer film is composed of a carrier layer, a release layer and an imaging transfer layer with metallic layers, such as aluminum.

From the DE 10 2009 026 438 A1 a device for cold foil stamping is known. In this device, the film feed in a coating module for the transfer of imaging layers from a transfer film to a printing material is to be extended in its applicability. For this purpose, a limited pressing surface is arranged in the coating module for transferring layers from the transfer film. For a targeted control of the film feed is possible. In this case, the transfer film is preferably guided past a press roll in a limited width and approximately tangentially. For film storage and film promotion special cyclically operable conveyors are assigned for this purpose

From the DE 10 2010 009 402 A1 is a method for cold foil transfer with dynamic film tension known. A control system for avoiding high loads on motors and a transfer film web contains a control loop for a dancer movement acting on the transfer film web. The transfer film web is pinched off a supply roll by a leading edge between two rolls. The transfer film web is then fed via dancer of a timing module and diverting rollers through the transfer nip and then to a rear-end drawer. The rear-end drawer feeds the transfer-film web sandwiched between two rollers to a gathering roll.

From the DE 20 2004 003 746 U1 a device for transferring material from a hot stamping foil to a print material is known. The apparatus includes means for feeding and discharging a print material and means for feeding and discharging a hot stamping film. The hot stamping foil is withdrawn from a supply roll by means of a withdrawal unit consisting of a drive motor and a nip between two pinch rollers. After passing through a first dancer unit, the embossing station and a second dancer unit, the used hot stamping foil is fed via a second withdrawal unit to an empty spool. The second extraction unit also consists of a drive motor and a nip between two pinch rollers.

It is known to use such coating modules in printing units of sheet-fed printing machines, wherein the coating can be overprinted subsequent printing units. A disadvantage of the known devices is that they can not be used flexibly.

The object of the invention is therefore to provide an apparatus and a method by which the transfer of an imaging layer, e.g. a metallization layer, on a sheet can be done economically and accurately, in which case a partial film application should be possible.

The solution to this problem results in a device and a method according to the features of claims 1 and 8.

The device provides a clock system for guiding the transfer film web. A tactile film drive according to the invention has in each case a dynamically driven drive roller for cyclically moving a transfer film web, wherein the transfer film web is guided around the drive roller by more than 90 degrees, preferably by at least 180 degrees, but also by more than 180 degrees. In this case, the drive roller adjacent to one or more pressing devices for slip-free coupling of the transfer film web with the surface of the drive roller are arranged. The pressure means can be designed as distributed roll elements, as continuous rolls or as contact-free pneumatically acting pressure elements.

Such a tactile film drive is arranged in a first embodiment in the transport line of the transfer film web a transfer nip in the film transfer device. In a second embodiment, such a tactile film drive is ever before and arranged downstream of a transfer nip in the film transfer device.

The application takes place when the transfer film web is moved to the press roll in the course of a surface structure interrupting the function of the film transfer. Thus, the film transfer when passing through cylinder channels of Press roller and impression cylinder interrupted in the transfer gap. The film transfer can also be interrupted by a pressing surface structured by means of pressing segments or support elements on the surface of the press roll. Thus, the device is used when a pressing surface of a press roller for film transfer occupies a pressing surface having a partial area of the entire surface of a printing sheet.

Pressing surfaces can be configured as tensionable segments or as cut-out rubber blankets or as passably produced, for example photopolymer high-pressure plates or as detachable, as under magnetic effect, attachable pressing segments or as the press fabric of the press roll by means of underlay sheet different position and or length in different thicknesses performing.

In the following the invention is illustrated in more detail by means of drawings. Showing:

1 the construction of a film transfer device for film timing in a sheet-fed press,

2 to 4 the schematically illustrated construction of a clock device according to the invention in sectional view,

5 a film drive in perspective overall view and

6 a schematic of the film movement in clock mode.

• – Ein Druckbogen S wird zunächst mit einem flächigen oder bildgebenden Klebstoffmuster versehen (in einem dem gezeigten Druckwerk vorgelagerten Bogenoffsetdruckwerk als Auftragwerk 1, hier symbolisiert).
• – Im hier dargestellten Folgedruckwerk wird der Druckbogen S dann gemeinsam mit einer Transferfolie 5 unter Pressung durch einen Transferspalt 6 geführt, (Beschichtungswerk 2) und mit einer Transferschicht z.B. aus Metall versehen.
• – In weiteren Druckwerken wird der mit Druckbogen S schließlich farbig überdruckt und ggf. mit einer Schutzschicht oder Glanzschicht versehen.

1 shows a printing unit of a sheet-fed rotary printing press, which contains a total of several printing units and is used for the following purposes:

• - A sheet S is first provided with a two-dimensional or imaging adhesive pattern (in the printing unit upstream sheetfed offset printing as Auftragwerk 1 , symbolized here).
• - In the following printing unit, the printing sheet S is then together with a transfer film 5 under pressure through a transfer nip 6 guided, (coating plant 2 ) and provided with a transfer layer such as metal.
• In further printing units, the printing sheet S is finally overprinted in color and optionally provided with a protective layer or gloss layer.

The commissioned work 1 may be a known offset printing unit with an inking unit, a plate cylinder and a blanket cylinder. The blanket cylinder 3 acts with an impression cylinder 4 together. The coating plant 2 is also designed as an offset printing unit or possibly as a paint module of a sheetfed offset printing press. The transfer gap 6 in the coating plant 2 is through a press roll 3 and an impression cylinder 4 educated. The press roll 3 may correspond to the blanket cylinder of the offset printing unit or the forme cylinder of a paint module. With web guiding elements 14 in and on the coating unit used for the film transfer 2 becomes the transfer film 5 also by protective devices 15 of the coating plant 2 on and executed again. The coating plant 2 is a foil supply roll 8th assigned to this purpose a rotary drive 7 for regulated feeding of the transfer film 5 is arranged. The discharge side of the printing unit is a film collection roll 9 (Symbolized here) provided for the used sheet material, which is associated with a rotary drive. The press roll 3 is with a press cover 10 for example, as a plastic coating, comparable to a rubber or blanket, provided, which is held in a cylinder channel on jigs.

The film transfer module may be associated with dryers, such as UV dryers, for drying the adhesive or the entire film coating. Also, by means of a monitoring device for scanning the sheet surface, the evaluation of image contents or detection of defects in the coating can take place. The web tension of the transfer film 5 is in conjunction with film guide rollers 14 Monitorable with measuring devices. To stabilize the transfer film web 5 serves in front of the transfer gap 6 a stabilizer 30 with two guide rollers.

Furthermore, as the surface of the press roll 3 in addition to a smooth and a contoured or segmented pressing surface in the press fabric 10 be provided. For this purpose, in addition to a full-surface pressing area on one or more areas to be coated limited segmental pressing areas on the press roller 3 used. By means of the limited segmented pressing surface in the press fabric 10 a pressing of the transfer film takes place 5 against a signature S on the impression cylinder 4 only if the segmented pressing surface is the transfer nip 6 passes through and thereby transferring image-forming layers from the transfer film 5 effect on the sheet. According to the invention, a timing of the film feed of the transfer film is provided 5 to do that so that the transfer film 5 is essentially only moved when against the sheet S on the impression cylinder 4 is pressed. On the other hand, the film feed is reduced or stopped, if no contact pressure of the transfer film 5 to a sheet S done.

• I. Die Taktung des Vorschubs der Transferfolie 5 kann beim Durchlauf von Zylinderkanälen 22, 80 durch den Transferspalt ausgeführt werden, es erfolgt also eine so genannte Kanaltaktung.
• II. Die Taktung des Vorschubs der Transferfolie 5 kann ausgeführt werden, wenn ein durch an der Pressbespannung 10 begrenzte Pressflächen definiertes Druckformat / Drucksujet 83 für zu beschichtende Bereich innerhalb des Druckbogens S vorliegt. Hierbei spricht man dann von einer Formattaktung oder Sujettaktung, die vorzugsweise kürzer als die maximale Länge des Druckformates ist.
• III. Die Taktung des Vorschubs der Transferfolie 5 kann ausgeführt werden, wenn der durch segmentierte Pressflächen an der Pressbespannung 10 definierte zu beschichtende Bereich innerhalb des Bildbereiches des Druckbogens S liegt. Dann spricht man von einer Prägebereichstaktung, die sich auf einen Bereich innerhalb des Drucksujets 83 bezieht.
• IV. Eine weitere Verbesserung der Folienausnutzung der beschriebenen Art ergibt sich, wenn die Transferfolie 5 in eine oder mehrere Teilfolienbahnen geringerer Breite aufgeteilt wird. Die ist insbesondere in Verbindung mit der segmentierten Pressfläche von großem Vorteil.

Therefore, some effects are in a coating module 2 with in a press cover 10 provided segmented pressing surface achievable:

• I. The timing of the feed of the transfer film 5 can when passing through cylinder channels 22 . 80 be carried out through the transfer gap, so there is a so-called channel timing.
• II. The timing of the feed of the transfer film 5 can be performed when a through at the press fabric 10 limited pressure areas defined print format / print subject 83 is present for to be coated area within the sheet S This is then called a formattaktung or Sujettaktung, which is preferably shorter than the maximum length of the print format.
• III. The timing of the feed of the transfer film 5 can be performed when the segmented pressing surfaces on the press fabric 10 defined area to be coated within the image area of the sheet S is located. Then one speaks of a Prägebereichpaktung, which refers to an area within the Drucksujets 83 refers.
• IV. A further improvement of the film utilization of the type described results when the transfer film 5 is divided into one or more Teilfolienbahnen lesser width. This is particularly advantageous in connection with the segmented pressing surface.

For film supply and film removal, the drive of the film rolls 8th . 9 continuously. In the cycle operation of the cold foil transfer thus fall during braking of the transfer film web 5 at the end or after the end of the transfer area until re-accelerating at the beginning or before the beginning of the transfer area in the feed and discharge areas of the transfer film web 5 opposite to the movement of the film rolls 8th . 9 excess or missing film lengths.

1 shows an arrangement for rapid compensation of displacements of the transfer film web 5 in the feed area and in the discharge area during film timing in the cold foil transfer process. For clocked promotion of the transfer film 5 are drive groups 33 and 37 provided, which consist of roller assemblies in conjunction with drives. The transfer foil 5 is about friction from the drive groups 33 . 37 promoted. This must be at least the front of the transfer gap 6 the transfer film web 5 assigned drive group 33 to be able to transfer the film 5 slip-free to the transfer gap 6 to promote.

The required storage effect in the film timing is achieved by use of a per se known principle of looping the transfer film web 5 generated by negative pressure. Here are foil stores 32.1 and 32.2 in the form of unilaterally open and rectangular in cross section vacuum chambers of the transfer film web guide in the coating plant 2 assigned. The height expansion of the film storage 32.1 . 32.2 gives the size of a maximum possible film loop 36 in front. Through an open side of the vacuum chambers, the film loop 36 the respective foil storage 32.1 . 32.2 fed. A respective open end of the vacuum chambers opposite is at least one pneumatic system for vacuum generation as a vacuum unit 32.3 assigned. The vacuum unit 32.3 can be used as a common aggregate for the vacuum chambers of both film storage 32.1 . 32.2 be educated. The vacuum unit 32.3 can be constructed from one or more fans and is at the bottom of the pressure differential or the film storage in terms of working arrangement 32.1 . 32.2 attached as the top of the vacuum chambers to be designated front page.

The effect of the film storage 32.1 and 32.2 is as follows:
By suction of air by means of the vacuum unit 32.3 the foil store 32.1 and 32.2 each becomes a foil loop 36 with one according to the ratio between the negative pressure generated and the tension of the transfer film web 5 adjusting force in each of the vacuum chambers of the film storage 32.1 and 32.2 drawn. This the film loop 36 forming and holding force does not exceed the predetermined by the web tension control tensile force of the transfer film web 5 because the foil loops 36 otherwise they would be sucked into the vacuum chambers and thus blocked. The system is self-regulating insofar as the film loops 36 can oscillate freely against the force of the negative pressure in the vacuum chambers and so each partial lengths of the transfer film web 5 record or release.

To control the film web promotion, the size of the film loops 36 within each foil store 32.1 and 32.2 by means of a sensor system which is based on a distance measurement by means of ultrasound, for example. So it is recognized how far the film loop 36 is pulled into the respective vacuum chamber. On the basis of these constantly recorded measurement signals can then by means of the drives of the film rolls 7 . 8th and possibly in conjunction with dancer rollers 18 the film web conveying for the film supply and the film removal are regulated.

To maintain the web tension of the transfer film web 5 and to ensure their perfect guidance can continue the generated negative pressure of the vacuum unit 32.3 in the foil stores 32.1 . 32.2 be regulated. This is the process-dependent training required the foil loops 36 Ensured at all times sufficiently.

• a) Bei Unterbrechung des Folientransfers und dem Stillsetzen des Folientransportes im Transferbereich (Transferspalt 6) wird durch Stillsetzen der Antriebsgruppe 33 vor dem Transferspalt 6 bei weiterlaufender Folienrolle 7 eine auflaufende Folienbahnlänge freigegeben, die mittels Unterdruck in den ersten Folienspeicher 32.1 hineingezogen wird.
• b) Auf der Ablaufseite nach dem Transferbereich (Transferspalt 6) wird gleichzeitig bei stillstehendem Folientransport die Transferfolienbahn 5 aus dem zweiten Folienspeicher 32.2 gegen den dort herrschenden Unterdruck zur kontinuierlichen Aufwicklung auf der Foliensammelrolle 9 freigegeben.
• c) Zum Fortsetzen des Folientransfers und damit dem erneuten Einsetzen des Folientransportes im Transferbereich (Transferspalt 6) wird die Antriebsgruppe 33 wieder aktiviert und die eingezogene Folienschlaufe 29 wird aus dem ersten Folienspeicher 32.1 gegen den dort herrschenden Unterdruck wieder dem Transferbereich zugeführt.
• d) Gleichzeitig wird der zweite Folienspeicher 32.2 von einer Antriebsgruppe 37 wieder mit einer Folienschlaufe 36 befüllt, da der Folienabzug aus dem Folienspeicher 32.2 mittels der Foliensammelrolle 9 langsamer abläuft als die Folienzufuhr mittels der Antriebsgruppe 37.

The arrangement of the film storage 32.1 . 32.2 serves to ensure that the timing of the film web feed when stopping and continuing the film transport by means of the drive groups 33 . 37 in the transfer area can be executed as follows:

• a) If the film transfer is interrupted and the film transport is stopped in the transfer area (transfer gap 6 ) is stopped by stopping the drive group 33 in front of the transfer gap 6 with continuing film roll 7 released a run-up film web length, which by means of negative pressure in the first film memory 32.1 is involved.
• b) On the discharge side after the transfer area (transfer gap 6 ) becomes the transfer film web at the same time when the film transport is stationary 5 from the second foil store 32.2 against the prevailing negative pressure for continuous winding on the film collecting roll 9 Approved.
• c) To continue the film transfer and thus the re-insertion of the film transport in the transfer area (transfer gap 6 ) becomes the drive group 33 reactivated and the retracted film loop 29 gets out of the first slide store 32.1 fed back against the prevailing negative pressure to the transfer area.
• d) At the same time, the second film memory 32.2 from a drive group 37 again with a film loop 36 filled, since the film deduction from the film storage 32.2 by means of the film collecting roll 9 runs slower than the film feed by means of the drive group 37 ,

In 1 are according to the functions shown, the film storage 32.1 and 32.2 in the coating plant 2 shown. The foil stores 32.1 and 32.2 are approximately perpendicular adjacent to the unwinding roll 8th arranged parallel to each other. A first drive group 33 is with two foil guide rollers 35 and a drive roller 34 on the inlet side of the transfer area close to the transfer gap 6 arranged. Another drive group 37 with two foil guide rollers 39 and a drive roller 38 is on the drain side of the transfer nip 6 fro the foil store 32.2 upstream. This arrangement makes the feeding of the transfer film web 5 from the film loop 36 in the foil store 32.1 compact and allowed via the smoothing and stabilizing device 30 a secure feed of the transfer film web 5 to the first drive group 33 , Furthermore, the transfer film web 5 on the outlet side of the transfer area after the transfer gap 6 over the transfer film web 5 smooth-holding foil guiding elements 14 be performed in the manner of a smoothing and stabilizing device.

On the feed side and the discharge side of the film storage 32.1 and on the discharge side of the film storage 32.2 is ever a foil guide roller 31 shown, for better guidance of the transfer film web 5 serve so that the transfer film web the film storage 32.1 exactly fed and from the film storage 32.2 kept smooth to wind up dissipated.

The vacuum chambers of the film storage 32.1 and 32.2 can be designed according to leading film or partial film webs, wherein in the direction of the film loops 36 Parallel to the side edges aligned and slidably disposed in the width direction separating devices are provided. If the vacuum chambers have the width of a transfer film web and are displaceable, it is possible to respond flexibly to desired coating conditions. Furthermore, in the maximum width of the working area completely overlapping vacuum chambers, the above-mentioned separating devices may be arranged, each of which the lateral position of the transfer film web 5 or partial film webs. This allows the film storage 32.1 and 32.2 be advantageously divided into a plurality of parallel vacuum chambers of variable width and function. These are on individual transfer film webs 5 different width or on partial film webs of the same or different widths tunable. Preferably, in order to maintain the negative pressure in unused areas, the lower end of the film feed associated end face or the upper portion of the vacuum unit 32.3 designed lockable. Thus, the formation of film loops 36 Improved every possible width and perfectly matched to the respective film or partial film webs.

In 2 is a drive group according to the invention for the functionality of the supply of the film strand to be provided 5A according to the drive group 33 in 1 in a technical design with non-contact pressing of the transfer film web 5 shown. This is a film drive roller 70 with a clock drive 71 coupled, the movement of the film drive roller 70 controls highly dynamically in any movement cycles. The foil drive roller 70 is a freely rotatably mounted foil guide roller 25 associated with preferably smooth elastic surface. The foil guide roller 25 is with a swiveling and swiveling cladding element 73 coupled to the drive group. So the film guide roller 25 directly or indirectly via a Getriebeanlenkung when pivoting the cladding element 73 from the film drive roller 70 for the introduction of the transfer film web 5 be swung and then swung back. The location of the foil guide roller 25 is in working position chosen so that the inserted transfer film 5 from the film drive roller 70 is derived without deforming or damaging them. In addition, this is chosen so that the inserted transfer film 5 at a short distance from the film drive roller 70 is derived, so that the transfer film 5 can be carried away as possible without slip. The transfer foil 5 is in this embodiment, the film drive roller 70 via a foil guide roller 23 fed and over the film guide roll 25 removed again, so that a wrap of more than 90 degrees is formed. A wrap of the transfer film web is advantageous 5 on the film drive roller 70 of about 180 degrees or more, as shown here. This ensures good film guidance and additional friction surface for safe film transport. The foil drive roller 70 is a contact pressure segment for slip-free conveying 26 with a substantially smooth inner guide surface 26.1 assigned. The inner guide surface 26.1 is to the contour of the film drive roller 70 adapted and surrounds the film drive roller 70 about 180 degrees. The pressure segment 26 is in a swiveling and swiveling cladding element 73 the drive group held. So it can be provided that the Andrucksegment 26 when swinging the cladding element 73 from the film drive roller 70 for the introduction of the transfer film web 5 removed and then reconnected to them. The location of the contact pressure segment 26 is in working position by the holder in the cladding element 73 certainly. This is the Andrucksegment 26 via an adjustable fixable holding device in the direction against the film drive roller 70 set and against the film drive roller 70 set.

In the pressure segment 26 is a blowing air supply 28 integrated, over which a blast air flow in the guide surface 26.1 arranged fine outflow openings in a space acting as a nip clearance between the guide surface 26.1 of the contact pressure segment 26 and the film drive roller 70 or on this resting transfer film 5 is introduced. For this purpose, the Andrucksegment 26 on its inside contain an insert of porous sintered metal, which is the guide surface 26.1 forms.

The outflow openings are otherwise preferably located in the central region of the guide surface 26.1 and are at least the full length of the film drive roll 70 equally distributed. You can also in the circumferential direction of the film drive roller 70 be arranged distributed. The strength of the blast air flow is adjustable in terms of quantity and pressure. Furthermore, the blast air is switched on and off depending on the operation.

In 3 is a further drive group according to the invention in an embodiment with non-contact pressing of the transfer film web 5 shown. A foil drive roller 70 is with a clock drive 71 coupled, the movement of the film drive roller 70 continuously or highly dynamically controls. The embodiment shown here corresponds in functionality to the drive group 37 according to section U in 1 , one being the transfer gap 6 to be fed strand of film 5A from a foil guide roller 31 is guided in one direction. Furthermore, a foil strand to be removed from the transfer nip 5B the used transfer film web 5 from the drive group 37 a foil store ( 32.2 , please refer 1 ) from where the transfer film web 5 then from the film collection roll 9 is deducted.

The foil drive roller 70 is a pressure pad 26 with a substantially smooth inner guide surface 26.1 assigned. The inner guide surface 26.1 is to the contour of the film drive roller 70 adapted and surrounds the film drive roller 70 about 180 degrees. The pressure segment 26 is with a swiveling and swiveling cladding element 73 coupled to the drive group. So the Andrucksegment 26 when swinging the cladding element 73 from the film drive roller 70 for the introduction of the transfer film web 5 removed and then reconnected to them. The location of the contact pressure segment 26 is in working position by a holding device 29 certainly. In this case, the Andrucksegment 26 via a force-controlled, such as resilient, on the Andrucksegment 26 acting holding device 29 in the direction against the film drive roller 70 pressed or opposite the film drive roller 70 be set.

In the pressure segment 26 is according to the embodiment according to 3 a blown air supply 28 integrated, over which a blast air flow in the guide surface 26.1 arranged fine outflow openings in a space acting as a nip clearance between the guide surface 26.1 of the contact pressure segment 26 and the film drive roller 70 or on this resting transfer film 5 is introduced.

The pressure of the blowing air is chosen so that the inserted transfer foil 5 through the pressure in the gap against the film drive roller 70 is pressed, so that the transfer film 5 can be promoted slip-free. The transfer foil 5 is in this embodiment, the film drive roller 70 via film guide rollers 23 removed and discharged again, so that a wrap of more than 90 degrees. A wrap of the transfer film is advantageous 5 of about 180 degrees or more, as in the aforementioned embodiment 4 is shown. This is a good film guide and additional friction between the film drive roller 70 and the transfer film web 5 ensured for safe film transport. A friction on the Andrucksegment 26 On the other hand, it is reliably prevented in production, so that unimpeded film transport can take place.

In the solution shown here, the blown air to the Andrucksegment 26 be switched off at standstill of the printing press, so that the Andrucksegment 26 by means of the resilient (or air pressure) employed Andruckeinrichtung 29 against the film drive roller 70 and the possibly guided on it transfer film 5 is pressed. This is the transfer film web 5 by means of the contact pressure segment 26 touching the film drive roller 70 recorded. In state with promotion of the transfer film 5 during production with inserted transfer foil web 5 blowing air becomes the contact pressure segment 26 fed into the gap between the guide surface 26.1 and the transfer film web 5 on the film drive roller 70 entry. In this case, an overpressure builds in the nip between the Andrucksegment 26 or its guide surface 26.1 and the film drive roller 70 or the transfer sheet guided on it 5 on. As a result of this acting as a surface contact pressure air overpressure lifts the Andrucksegment 26 from the film drive roller 70 and the transfer film 5 against the force of the resilient (or air pressure) employed Andruckeinrichtung 29 from. This is the transfer film web 5 now over the entire area of the guide surface 26.1 evenly against the film drive roller 70 pressed. The force of the contact pressure is the setting of the contact force, so about a spring force or a pneumatic device, on the adjusting device 29 dependent. Against this contact force is formed by the air pressure in the gap between the guide surface 26.1 and the film drive roller 70 or the transfer film web 5 a balance of power.

If the pressure pad 26 not by means of a self-regulating pressure device 29 via spring force (also air pressure) against the film drive roller 70 should be employed, this can also by means of a pivoting mechanism at a distance from the surface of the film drive roller 70 be made adjustable, as in 2 is shown.

The compact design of the drive group 37 in the case 72 is in an association with the first slide store 32.1 This additionally improves that in the same housing 72 also a foil guide roller 23.1 for discharging the transfer film web 5 in a feeder line 5A from the first foil store 32.1 to the feeder towards the transfer gap 6 is arranged. For this purpose, the drive group 37 as well as in 1 is shown in the immediate vicinity of the open end faces of the film storage 32.1 . 32.2 arranged. The foil guide roller 23.1 corresponds to the film guide roller 31 that of the drive group 37 and its film guide roll 39 is closest.

In 4 is a drive group 37 in a technical version with foil contacting for the withdrawal of the transfer film web 5 from the work area in the transfer gap 6 shown. This working group 37 is according to a section U in 1 the foil store 32.2 upstream. This is a film drive roller 70 with a clock drive 71 coupled, the movement of the film drive roller 70 highly dynamic controls. The film drive roller shown here 70 corresponds to 1 (see section U) of the drive roller 38 , The foil drive roller 70 is in the illustrated embodiment, a plurality of groups or evenly in the axial direction of the film drive roller 70 distributed and freely rotatably mounted on an axle pinch rollers 24 assigned. The pinch rollers 24 are with a swiveling and swiveling cladding element 73 connected to the drive group. This can be the pinch rollers 24 from the film drive roller 70 for the introduction of the transfer film web 5 be swung and then swung back. The adjustment of the position of the elastic pressure rollers 24 is in working position chosen so that the inserted transfer film 5 against the film drive roller 70 is pressed without this deform or damage and that the transfer film 5 can be promoted with or without slip through the conveying gap. The transfer foil 5 is on the film drive roller 70 via film guide rollers 23 added and removed, so that a wrap of more than 90 degrees. A wrap of the transfer film is advantageous 5 of about 180 degrees or more on the film drive roll 70 , This ensures good film guidance and additional friction surface for safe film transport. The drive group 37 is designed so that the transfer film 5 in a feeder line 5A from a foil store ( 32.1 , please refer 1 ) the transfer gap 6 fed and continue from the transfer gap 6 another foil store ( 32.2 , please refer 1 ) can be supplied. This type of film web guide is dependent on the respective arrangement of the elements to each other, the solution shown is based on that the film storage 32.1 . 32.2 are arranged parallel to each other and directly coupled to each other. This creates a very easy to handle film guide in an extremely compact design.

If the named drive group 37 to 2 as a second drive group for the removal of the expiring foil strand 5B the transfer film web 5 from the transfer gap 6 to the film storage 32.2 after the transfer gap 6 can be used, the clock drive 71 the film drive roller 70 also be set as continuously running. Then pull the drive group 37 continuously transfer film web to a continuous Film removal of the used transfer film 5 to the foil collecting roll 9 sure. On the other hand, in the cycle mode, the film promotion interrupted with stationary transfer film web and the drive group 37 then runs in slip mode opposite to the expiring foil strand 5B by. Therefore, in the aforementioned case, a larger wrap of the film drive roller 70 through the film train 5B the transfer film web 5 not required or rather a hindrance, since only a minimum web tension for discharge supported otherwise but also slippage must be allowed.

In connection with the management of the transfer film web 5 can reduce friction and thus facilitate the guidance of the transfer film 5 Also be provided at corresponding working positions guide shafts with air outlet openings. There can be the transfer film web 5 then be smoothly guided on an air cushion. Frictional or inertial forces of rotating rollers then also act on the transfer film so that it is less prone to distortion and wrinkling. Such an arrangement is something for the film guide rollers 31 or for foil guiding elements 14 meaningful.

Furthermore, a film guide in the manner of a spreader roll may be provided in a preferred manner in the region of the film feed to a drive group. This arrangement is preferably a drive group 33 for the film feed a film strand 5A to the transfer gap 6 assigned. Such a spreader roll can be embodied as a deflection roll which can be deflected radially in the axis, wherein a deflection is preferably carried out in the region of the center of the deflection roll, so that the transfer film web 5 stretched in width to the side edges and thereby smoothed. Thus, the drive group can be easily fed for a flat film transport and for a subsequent high-quality transfer coating. This version can for the film guide roller 23 in 2 be provided.

To support the film transport, the film drive roller 70 Also as a suction roll with finely distributed suction for sucking the applied transfer film 5 be executed. With appropriate suction, this embodiment can also be operated without pressure elements. This can be a safe and slip-free film transport with non-contact acting Folienanpressung against the surface of the film drive roller 70 be guaranteed. The drive method with the operating principle of a non-contact Folienanpressung for film guidance is self-regulating depending on the operating condition.

In 5 is an overview of a drive group as a compact unit according to the embodiments of 3 and 4 respectively the drive group 37 according to 1 shown. The drive group is in a housing 73 recorded, whose one side of the hinged cladding element 73 is formed. On the case 72 is the clock drive 71 as a highly dynamic or continuously operated drive for the film drive roller 70 appropriate. So can in the smallest space, the transfer film 5 in the case 72 arranged and not visible here foil drive roller 70 and the associated film guide rollers 23 be driven cyclically or continuously. Furthermore, here is a preferred embodiment for the second drive group 37 shown, wherein the housing 72 both the elements for the film drive by means of the drive group 37 as well as elements for the guidance of the transfer film 5 from the first film store 32.1 to the first drive group 33 shared. This design is based on the parallel compact arrangement of the film storage 32.1 and 32.2 ,

For the embodiments according to the 2 to 4 applies in the main application case, that the transfer foil 5 with the side of its carrier layer on the film drive roller 70 is hung up. This will ensure that the transfer layer of the transfer film 5 experiences only a touch in a limited area. With high-quality design of the surface of the film drive roller 70 can the transfer layer of the transfer film 5 also on the film drive roller 70 be placed so that the transfer layer always rests flat and can not be affected by a limited impact surface in their integrity.

To optimize the film savings, the arrangement of the drive groups with a respective clock drive 71 on both sides of the transfer gap 6 on the coating module 2 be arranged for the cold foil transfer. With a suitable control can also be a return stroke of the transfer film in the previously considered case of film discontinuity in clock mode 5 be provided.

Because of the high production speed when coating in a sheet-fed offset printing machine is provided, the transfer film 5 in clock mode for a complete execution of the film transfer only shortly after the area to be coated (Sujetende) slow down from production speed. Also provided is the acceleration of the transfer film web 5 to start so early that the production speed is reached before the beginning of the new area to be coated (beginning of the subject). Although this results in additional losses of film surface, but a good coating quality can be ensured in all subject areas. These losses can be reduced by one within the current Production speed and the distance between Sujetende and Sujetanfang matched Folienrückhub against the production direction R of the transfer film 5 at least by means of the drive group 33 be minimized.

The working principle is in connection with 6 to describe as follows. The transfer foil 5 is usually moved at the same speed, which corresponds to the surface of the paper or sheet S (production speed A). This is also the speed of the surface of the impression cylinder 4 or the press roll 3 , in which case the relative position of the surfaces is taken into account, taking into account the thickness of the applied printing material. In 6 Therefore, a diagram showing the speed of the transfer film web is shown 5 over the circumferential position of the impression cylinder 4 in the transfer gap 6 indicates. The reference position of the transfer gap 3 and the press roll 3 are symbolically indicated here. Here, the horizontal axis of the diagram is a path over the circumference of the impression cylinder 4 while the vertical axis represents the velocity profile of the transfer film web 5 in the production direction R represents positive velocity X and Y in the return stroke direction as negative velocity. Therefore, a positive velocity X results in a film transport in the production direction R, the zero position of the speed means film discontinuity and a negative velocity Y results in a film transport counter to the production direction R, ie a film return stroke.

In 5 is schematically the area of the impression cylinder 4 shown, which has a cylinder channel 80 with a front and a rear channel edge 81.1 . 81.2 having. On the impression cylinder 4 is a sheet S in grippers 82 at its front channel edge 81.1 associated leading edge. At certain distances to each end of the sheet S and thus to each of the channel edges 81.1 . 81.2 is a limitation of a printed matter 83 defined, which is provided on the printing sheet S. A limitation for a relative movement of the film transport results here from the length of the printing sheet S, on which the transfer film 5 rests and out of the edge areas of the Drucksujets 83 , which results from the closest to the paper edge and to be coated with metal foil areas.

• A1, A2 Arbeits-/Produktionsgeschwindigkeit
• B Verzögern, abbremsen der Transferfolie, Bremsrampe
• C Folienstillstand, während dessen kein Kaltfolientransfer stattfindet
• D Beschleunigung der Transferfolie, Beschleunigungs-/Anfahrrampe
• E1, E2 Sicherheitsschaltabstand zu den Sujeträndern

In the movement of the transfer film web 5 The following process conditions result cyclically

• A1, A2 working / production speed
• B Decelerate, decelerate the transfer film, brake ramp
• C film discontinuity during which no cold foil transfer takes place
• D Acceleration of the transfer foil, acceleration / approach ramp
• E1, E2 Safety distance to the sujder edges

The above safety switching distances or safety distances E1, E2 between edges 83.1 . 83.2 of the printed matter 83 and the respective channel edges 81.1 and 81.2 is provided, so that a consistent coating quality for the cold foil transfer within the entire Drucksujets always 83 up to both edges 83.1 . 83.2 can be complied with. The safety distances E1 and / or E2 may vary depending on the nature of the printed matter 83 be minimized within the sheet S at a sufficiently large distance from the front and rear edges of the paper. Then, a restriction of the safety distances E1 and E2 to the distance of the paper edges of the sheet S to the front and rear channel edge 81.1 . 81.1 from, in which case the film consumption is further reduced.

In 6 Therefore, a diagram showing the speed of the transfer film web is shown 5 over the circumferential position of the impression cylinder 4 in the transfer gap 6 indicates. Here, the horizontal axis of the diagram is a path over the circumference of the impression cylinder 4 while the vertical axis represents the velocity profile of the transfer film web 5 in the production direction R represents positive velocity X and Y in the return stroke direction as negative velocity. Therefore, a positive velocity X results in a film transport in the production direction R, the zero position of the speed means film discontinuity and a negative velocity Y results in a film transport counter to the production direction R, ie a film return stroke. The production speed X, A1, A2 is predetermined here by the operating speed of the sheet-fed offset printing press in the production process. The foil transport takes place with execution of the cold foil transfer with just this speed, since the transfer foil 5 For a good coating quality yes must be performed synchronously to the sheet S to a high degree.

The production speed X, A1, A2 is predetermined here by the operating speed of the sheet-fed offset printing press in the production process. The foil transport takes place with execution of the cold foil transfer with just this speed, since the transfer foil 5 For a good coating quality yes must be performed synchronously to the sheet S to a high degree.

• – Annäherung des Transferspalts 6 an die hintere Kanalkante 81.2, Transferfolienbahn 5 wird mit Produktionsgeschwindigkeit A1 in Produktionsrichtung R mit dem aktuell ablaufenden Druckbogen S bewegt.
• – Transferspalt 6 liegt innerhalb des Sicherheitsabstandes E1 vom hinteren Rand 83.2 des Drucksujets 83, Transferfolienbahn 5 wird weiterhin mit Produktionsgeschwindigkeit A1 bewegt
• – Transferspalt 6 liegt mindestens im Sicherheitsabstand E1 von dem hinteren Rand 83.2 des Drucksujets 83, Abbremsung B der Transferfolienbahn 5 mittels des Taktantriebes 71 längs einer Bremsrampe von Produktionsgeschwindigkeit A bis zum Stillstand C
• – Stillstand C der Transferfolienbahn 5 während der Gegendruckzylinder 4 und die Presswalze 3 weiterbewegt werden
• – Annäherung des Transferspalts 6 an die vordere Kanalkante 81.1, Beschleunigung D des Taktantriebes 71 längs einer Beschleunigungsrampe aus dem Stillstand C der Transferfolienbahn 5 bis auf Produktionsgeschwindigkeit A2
• – Erreichen der Produktionsgeschwindigkeit A2 mindestens im Sicherheitsabstand E2 vor dem vorderen Rand 83.1 des Drucksujets 83 nach Passieren der Greifer 82 mit dem neuen Druckbogen S durch den Transferspalt 6
• – Transferspalt 6 innerhalb des Sicherheitsabstandes E2 vom vorderen Rand 83.1 des Drucksujets 83, Transferfolienbahn 5 wird mit Produktionsgeschwindigkeit A2 gefördert
• – Transferspalt 6 im Drucksujet 83, neuer Druckbogen S wird mit Produktionsgeschwindigkeit A2 mittels der Transferfolienbahn 5 beschichtet

The aforementioned states result in a duty cycle for a film clock with film discontinuity as follows, in 7 the processes against the production direction R are to be considered. In each case, the film movement is relative to transfer nip 6 in terms of the location of the transfer gap 6 opposite the impression cylinder 4 considered:

• - Approaching the transfer gap 6 to the rear channel edge 81.2 , Transfer film web 5 is moved with production speed A1 in the direction of production R with the current expiring sheet S.
• - Transfer gap 6 lies within the safety distance E1 from the rear edge 83.2 of the printed matter 83 , Transfer film web 5 will continue to be moved at production speed A1
• - Transfer gap 6 is at least at safety distance E1 from the rear edge 83.2 of the printed matter 83 , Abbremsung B of the transfer film web 5 by means of the clock drive 71 along a braking ramp from production speed A to standstill C
• - Standstill C of the transfer film web 5 during the impression cylinder 4 and the press roll 3 be moved on
• - Approaching the transfer gap 6 to the front channel edge 81.1 , Acceleration D of the clock drive 71 along an acceleration ramp from standstill C of the transfer film web 5 up to production speed A2
• - Achieving the production speed A2 at least at the safety distance E2 in front of the front edge 83.1 of the printed matter 83 after passing the gripper 82 with the new sheet S through the transfer nip 6
• - Transfer gap 6 within the safety distance E2 from the front edge 83.1 of the printed matter 83 , Transfer film web 5 is conveyed at production speed A2
• - Transfer gap 6 in the printed matter 83 , new printing sheet S is produced at production speed A2 by means of the transfer film web 5 coated

When clocking so be to minimize the consumption of transfer film 5 Movements for braking and acceleration of the transfer film web 5 switched so that, depending on the length of the work area on the sheet S and the press roller 3 or the impression cylinder 4 in which no cold foil transfer can or should take place, the transport of the transfer film web 5 is stopped. At the same time, the print quality for cold foil transfer increases to the edges 83.1 . 83.2 of the printed matter 83 ensuring that safety distances E1, E2 to the areas to be coated are observed for the braking and acceleration processes. At the same time, deceleration, acceleration and standstill times are selected so that maximum foil savings are achieved.

This results in the following tuning parameters:
In the area of the safety distances E1, E2 transfer foil is running 5 unused further, which can not be saved for safety reasons. During braking and acceleration phases B and D in production direction R, the transfer film is running 5 also unused further, this film consumption can not be completely eliminated for technical reasons. This results in the beginning of the film timing brake loss Z1, the size of the safety distance E1 to Sujetende 83.1 and depends on the setting of the brake ramp B in terms of their steepness. Furthermore, at the end of the film timing, an acceleration loss Z2 results, which depends on the size of the safety distance E2 at the beginning of the subject 83.2 and dependent on the setting of the acceleration ramp D in terms of their steepness, the acceleration phase must be completed at the latest at the beginning of the safety distance E2.

Finally, as the actual foil saving Z, the path length results while the transfer foil web 5 at standstill (see C). This as a minimum value to be understood foil saving Z is in 6 correlating to the path of the impression cylinder 4 in the transfer gap 6 shown while the transfer film web 5 is at least at a standstill. Special situations result from small distances between the channel edges or the Sujetränder to be considered for the film timing or Formatränder or even at very high production speeds, the latter may be variable depending on the pitch.

• – Bei schneller Beschichtungsproduktion kann wegen der hohen Produktionsgeschwindigkeiten Folientaktung abgestellt werden.
• – Bei reiner Kanaltaktung im Bereich der Zylinderkanäle 22, 80 wird der Bewegungstakt der Transferfolienbahn 5 auf einen maschinenabhängigen Festwert eingestellt, der winkelabhängig angesteuert wird.
• – Bei einer so genannten Sujettaktung wird der Bewegungstakt der Transferfolienbahn 5 variabel auf die Umfangslänge zwischen dem vorderen und dem hinteren Ende des Drucksujets 83 abgestimmt.
• – Bei variablen und insbesondere steigenden Produktionsgeschwindigkeiten wird der Bewegungstakt der Transferfolienbahn 5 geschwindigkeitsabhängig angepasst, korrigiert oder verringert.

In summary, in connection with the device described above and its application, there are various possibilities for economical or optimization of production quality serving modes of operation:

• - With fast coating production, film timing can be stopped because of the high production speeds.
• - For pure channel timing in the area of the cylinder channels 22 . 80 becomes the moving stroke of the transfer film web 5 set to a machine-dependent fixed value, which is controlled angle-dependent.
• - In a so-called Sujettaktung the movement stroke of the transfer film web 5 variable to the circumferential length between the front and the back of the Druckuujets 83 Voted.
• - With variable and in particular increasing production speeds, the movement stroke of the transfer film web 5 adjusted, corrected or reduced depending on the speed.

If like in 1 a drive group 33 on the feed side and a drive group 37 the discharge side of the coating module 2 are provided, the drive group 33 used on the feed side for the film timing. The drive group 37 on the discharge side can be in the same Working rhythm can be operated as the drive group 33 , where they only the transfer film web 5 must keep under sufficient tension.

As an alternative, the drive group can be activated during sheet breakage 37 be switched so that there is no active film transport by the drive group 37 with stationary transfer film web 5 continuous with slip against the transfer film web 5 passes. For this purpose, the pressure elements used in each case cyclically of the film drive roller 70 be turned off or reduced in their Anstellwirkung, so that the drive group 33 safely cause the foliar failure.

The very fast clock circuits for the clock drive 71 are derived from an angle signal of the sheet-fed press, the sequences of the control over each revolution of a counter-pressure cylinder 4 or a press roll 3 repeat each time. The relevant machine angles for a passage of a cylinder channel 22 . 80 for any known printing unit of the sheet-fed press 1 . 2 . 50 automatically issued by the machine control. For this reason, the relevant machine angles for the timing of the film transport of the transfer film are also 5 in that as a coating plant 2 used printing unit.

As already described alternatives, first the channel timing with fixed predetermined angle values for braking and acceleration of the transfer film web 5 be executed, since the passage angle of the channel edges 81.1 . 81.2 are predetermined by the machine design. For this purpose, the safety switching distances E1, E2 depending on the area coverage of Drucksujets 83 optionally switched on, if, for example, to be coated with metal foil Drucksujet more or less close to the sheet edge.

Furthermore, a Sujettaktung be performed, in which case the angle values for braking and acceleration must be determined. This requires the definition of the area or of the print format or print subject in which the transfer film web 5 is to move or outside of the transfer film web 5 can be stopped. This can be made possible in a known manner with the aid of underlayed press covers, cut-out blankets or high-pressure forms prepared as embossing plates. By manual or metrological determination of the more or less rough machine angles for the format or Sujetränder in the printed matter to be coated 83 of a print job can then taking into account the braking ramp B and the acceleration ramp D and the safety switching distances E1 and E2, the actual control angle for timing circuits drive groups 33 . 37 for the transfer film web 5 be easily calculated.

The braking ramp B and the acceleration ramp D can be influenced via control parameters. The mechanical properties of the transfer film play here 5 a role, since the thin film is always kept smooth and on the other hand, neither the film itself nor the transfer coating must tear. Usually, standardized values for different types of film are used here, which can be present as a characteristic table in the device.

Furthermore, in a coating plant 2 drive groups 33 . 37 be combined with different principles of action, so that either system with roll pressing or pneumatic pressure before and / or after the transfer nip 6 can be arranged.

LIST OF REFERENCE NUMBERS

1

 commissioned

2

 coating module

3

 press roll

4

 Impression cylinder

5

 Transfer film / transfer film web

5A

 film feed

5B

 foil transfer

6

 transfer nip

7

 roller drive

8th

 Film supply roll

9

 Foil composite role

10

 Press covering

14

 Folienleiteinrichtung

15

 Printing plant security

22

 cylinder gap

23

 Folienleitwalze

23.1

 Folienleitwalze

24

 pressure rollers

25

 Folienleitwalze

26

 Andrucksegment

26.1

 inner guide surface

27

 holder

28

 blow air

29

 pressure device

30

 stabilizing device

31

 Foil guide roller / foil feed

32.1

 film storage

32.2

 film storage

32.3

 Vacuum unit Foil storage

33

 drive group

34

 drive roller

35

 Folienleitwalze

36

 Loop / foil loop

37

 drive group

38

 drive roller

39

 Folienleitwalze

70

 Film drive roller

71

 clock drive

72

 casing

73

 Cladding, cladding element

80

 cylinder gap

81.1

 front channel edge

81.2

 rear channel edge

82

Gripper on the impression cylinder 4

83

 print motif

83.1

 front sujetrand

83.2

 back sujetrand

A

 Work / production speed

B

 Foil delay, braking ramp

C

 Foil arrest

D

 Film acceleration, acceleration ramp

E1

 Safety distance to the rear sujetrand

E2

 Safety distance to the front sujetrand

G

Cutting drive unit 37

R

 transport direction

S

 sheet

X

 Running speed of the transfer film web during production

Z

 foil saving

Z1

 brake loss

Z2

 accelerating loss

Claims (11)

Device for transfer of imaging transfer layers from a carrier foil to printed sheets at least with an applicator ( 1 ) for an image-wise coating of the printed sheets with an adhesive and with a coating module ( 2 ) for transferring the transfer layers to the printing sheet in a transfer nip ( 6 ) between an impression cylinder ( 4 ) and a press roll ( 3 ), wherein the transfer film ( 5 ) with the transfer layer in contact with the printed sheet together with this through the transfer nip ( 6 ) can be guided while transfer layers are imagewise transferred to the sheet and with a device for feeding the transfer film ( 5 ) to the coating plant ( 2 ) and for removal from the coating plant ( 2 ) with a drive for moving the transfer film in the working direction, wherein the film feed of the transfer film ( 5 ) is controllable by means of a film guide such that the transport of the transfer film ( 5 ) is stopped when in the transfer gap ( 6 ) of the coating plant ( 2 ) no transfer of a transfer layer to a printed sheet takes place, characterized in that the transfer film ( 5 ) are associated with controllable conveying devices for braking and accelerating in time with the processing of the film transfer, wherein the conveying devices ( 33 . 37 ) the transfer film web ( 5 ) lead and drive on one side without contact and that the conveyors ( 33 . 37 ) a transfer area in front of the transfer nip ( 6 ) or in each case the transfer area before and after the transfer gap ( 6 ) assigned. Apparatus according to claim 1, characterized in that a conveyor device a film drive roller ( 70 ), coupled with this highly dynamic clock drive ( 71 ) and an engageable with this over the length of the film drive roller ( 70 ) a uniform contact pressure generating Andrucksegment ( 26 ), wherein the transfer film ( 5 ) for slip-free transport in the region of a gap between the film drive roller ( 70 ) and the Andrucksegment ( 26 ) is clamped without contact in the conveying case and wherein the transfer film ( 5 ) over a wrapping angle of at least 90 degrees about the film drive roller ( 70 ) to be led. Apparatus according to claim 2, characterized in that the Andrucksegment ( 26 ) a blown air connection ( 28 ), through which blown air into a gap between a guide surface ( 26.1 ) on the inside of the Andrucksegmentes ( 26 ) and the film drive roller ( 70 ) with on this resting transfer film ( 5 ) is introduced, wherein in the Andrucksegment ( 26 ) with the blown air connection ( 28 ) and in blowing openings in the guide surface ( 26.1 ) are provided blowing air ducts opening. Device according to one or more of claims 1 to 3, characterized in that the film drive roller ( 70 ) for wrapping the transfer film ( 5 ) one or more foil guide rollers ( 23 ) are arranged in the direction of transport of the film before and / or downstream, such that the transfer film ( 5 ) at a wrap angle of at least 90 degrees, but preferably about 180 degrees, about the film drive roll ( 70 ) to be led. Device according to one or more of claims 1 to 4, characterized in that the film drive roller ( 70 ) with a pressure element ( 24 . 25 . 26 ) and one or more film guide rollers ( 23 . 23.1 ) are arranged so that a plurality of elements for guiding the transfer film ( 5 ) to both their cyclic drive, as well as in a feeding film strand ( 5A ) and / or in a laxative film strand ( 5B ) to other devices for carrying out the cold foil transfer in a common housing ( 72 ) are provided. Device according to one or more of claims 1 to 5, characterized in that the film drive roller ( 70 ) with a pressure element ( 24 . 25 . 26 ) and one or more film guide rollers ( 23 . 23.1 ) in a common housing ( 72 ) are arranged, wherein the common housing ( 72 ) a panel ( 73 ), which is used to open the housing ( 72 ) when inserting the transfer film ( 5 ) on the film drive roller ( 70 ) and that the cladding ( 73 ) a pressure element ( 24 . 25 . 26 ) and / or a film guide roll ( 23 ) is assigned in such a way that when opening the housing ( 72 ) the film drive roller ( 70 ) is released for film insertion. Device according to one or more of claims 1 to 6, characterized in that the conveying devices ( 33 . 37 ) are arranged and designed to execute a film return stroke against the production direction (R) of the film transport during film transfer, wherein the clock drive ( 71 ) of the film drive roller ( 70 ) is so controlled that after stopping the film transport at the end of a coating cycle for a sheet and before starting the film transport in the production direction (R) for the start of the coating cycle for the next sheet a Folienrückhub against the production direction (R) of the film transport during film transfer he follows. Method for carrying out a cold foil transfer with transfer of imaging transfer layers from a carrier foil to printing sheet (S) in a sheet-fed printing machine with at least one applicator ( 1 ) for an image-wise coating of the printed sheets (S) with an adhesive and with a coating unit ( 2 ) for transferring the transfer layers to the printing sheet (S) in a transfer nip ( 6 ) between an impression cylinder ( 4 ) and a press roll ( 3 ), wherein the transfer film ( 5 ) with the transfer layer in contact with the printed sheet together with this through the transfer nip ( 6 ) is transferred while transfers transfer imagewise on the printing sheet (S), wherein the transfer film ( 5 ) with a device for feeding to the coating plant ( 2 ) and with a device for removal from the coating plant ( 2 ), wherein the film transport with a drive for moving the transfer film ( 5 ) is carried out in the production direction (R), wherein the film feed of the transfer film ( 5 ) is controlled by means for film guide such that the transport of the transfer film ( 5 ) is stopped when in the transfer gap ( 6 ) of the coating plant ( 2 ) no transfer of a transfer layer to a printed sheet (S) takes place, characterized in that the transfer film ( 5 ) by means of controllable conveyors ( 33 . 37 ) is moved for braking and accelerating in time to the processing of the cold foil transfer, wherein the or all conveyors ( 33 . 37 ), which serve as the transfer film ( 5 ) on a drive roller ( 34 . 38 . 70 ) slip-free leader, the transfer film web ( 5 ) lead and drive on one side without contact and that the transfer film ( 5 ) by means of one or all conveyors ( 33 . 37 ), which is a transfer area in front of the transfer gap ( 6 ) or before and after the transfer gap ( 6 ), during the duration of the transport interruption of the transfer film ( 5 ) is kept under tension. A method according to claim 8, characterized in that the stopping of the conveying movement of the transfer film ( 5 ) by the clock drive ( 71 ) with an adjustable delay along a braking ramp, and that the transfer film ( 5 ) is accelerated with an adjustable acceleration along a starting ramp (D) in the production direction (R) up to the production speed (X, A2). Method according to one or more of claims 8 or 9, characterized in that the delay of the movement of the transfer film ( 5 ) from the production speed (X, A1) to a standstill (C) at least in a safety switching distance (E1) from a rear edge ( 83.2 ) of the printed matter to be printed ( 83 ) is introduced on the printing sheet (S). Method according to one or more of claims 8 to 10, characterized in that the acceleration of the movement of the transfer film ( 5 ) is introduced from standstill (C) up to production speed (X, A2) in such a way that the production speed (X, A2) at least in a safety switching distance (E2) from a front edge ( 83.2 ) of the printed matter to be printed ( 83 ) is achieved on the printing sheet (S).

Images