EP3395579B1 - Laser transfer printer and device for providing a colour particle film for the same - Google Patents

Description

The present invention relates to an apparatus for providing a color particle sheet in a laser transfer printer having a laser head disposed above a workpiece support plate. The invention further relates to a laser transfer printer with such a device.

To facilitate the recognition and identification of workpieces - e.g. of machines and machine parts, semi-finished goods, consumables but also of perishable goods etc. - these or their packaging are labeled or more generally "marked" with text and / or characters. Especially in quality assurance and automated production and warehousing, a clear, multiple machine recognition and traceability of the workpieces is often of great importance. Therefore, even small and low-value parts with a unique part number, a manufacturer identifier, a production batch number, a production time point or the like. usually permanently and permanently marked against external influences.

For marking a workpiece, depending on its nature, for example, a marked label can be attached, glued, screwed or riveted or the workpiece itself or its packaging can be marked. The application of a marked label or packaging in a marked package is very flexible, but requires each several steps, namely the production of the label or the packaging, the assignment of the workpiece and the attachment or packaging. There is the risk of misalignment or detachment of the attached label or falling out of the packaging, whereupon the workpiece remains incorrectly or not marked.

For marking, a variety of methods are used, including but not limited to engraving with a tool or laser beam or printing by an ink jet method or stamp. Engraving creates very permanent marks, but it will weaken the engraved work piece and remove the removed material; furthermore, use engraving tools used. Printing on the workpiece is flexible and gentle on materials, and colors are available on most surfaces, however, printing processes require additional drying time and the marks are less resistant to abrasion. Other methods of marking include bluing or tempering a workpiece, such as steel, aluminum, etc., by local heating using a laser beam; Even with some plastics, a superficial color change can be achieved with the help of a laser beam. However, these methods are only usable for workpieces made of certain materials and do not allow a choice of color.

Alternatively, a surface layer (colored) applied to a workpiece flatly can be removed locally by means of a laser beam ("subtractive process") or, conversely, can be fixed by means of a laser beam to adjacent ink particles - burned onto the surface as it were - ("additive processes"). This additive method of marking workpieces is referred to herein as "laser transfer printing." In this case, using the laser beam deflected in the laser head, for example by means of movable mirror, the desired mark is projected point by point on the applied paint particles on the workpiece, whereby these color particles due to the local heat on the workpiece, or its surface, are transmitted. The two methods are characterized by a very wide range of applications for a variety of material surfaces and almost any colors, but in the subtractive process, however, before applying the cover layer is applied and harden.

The color particles in the laser transfer printing can on the one hand be powdered or dissolved in liquid, which makes handling difficult, or by a to be applied to the workpiece to be applied color particle film, ie one serving as a carrier film for the color film, transferred. Such films are either manually placed on workpieces before marking or the workpieces - in this case mostly signs - are covered or laminated with the film prior to marking. Also known is a method of Leonard Kurz Foundation & Co. KG for decorating plastic parts ("laser color transfer", LCT, see: http://www.kurz.de/kurzweb/en/home.nsf/?Open&DirectURL = 4357A7E0 88B8C345C1257043004C4AFB, retrieved on April 7, 2017), in which a color particle film is automatically conveyed by the laser transfer printer is conveyed through and over the surface of a plastic part. However, this method results in a low print quality, which is moreover very uneven, and is therefore discontinued. DE-A1-198 11 031 discloses an apparatus for providing a color particle film in a laser transfer printer.

The invention has for its object to provide a device for laser transfer printing, which is easy and flexible to use and enables a consistently high quality of the printed mark.

• ein zwischen Auflageplatte und Laserkopf anordenbares Gestell; und
• ein am Gestell vertikalbeweglich gelagertes Wicklermodul, in welchem die Folie zwischen einem Ab- und einem Aufwickler weiterförderbar über ein Fenster gespannt ist.

This object is achieved according to a first aspect of the invention with a device of the aforementioned type, which is characterized by:

• a mountable between the support plate and the laser head frame; and
• a vertically movably mounted on the frame winder module, in which the film between a pay-off and a rewinder is further stretched across a window.

The invention is based on the finding that the print quality is related to the contact of the film with the workpiece. If the film is pulled over the workpiece as in the prior art, a uniform contact is not ensured, but an uneven air gap is formed between the film and the workpiece. According to the invention, the winder module can be lifted off the respective workpiece as a result of its vertically movable mounting and can be applied vertically to a following workpiece, thereby ensuring a uniform contact of the film and a high print quality. Such Device can be used flexibly and can even be used later in existing laser transfer printers.

To adapt to workpieces and markers of different sizes or to focus the laser beam, the laser head is usually conventional laser transfer printer with respect to the workpiece, i. vertical, movable. Therefore, it is advantageous if, according to a further preferred feature of the invention, the winder module has a clamp for detachably coupling to such a vertically movable laser head. This eliminates an additional vertical drive of the Wicklermoduls and the window spanning the film and the laser head always remain in the same, predetermined by the coupling mutual distance; Refocusing after each workpiece can be omitted.

In order to be able to apply the film even more reliably to the workpiece, it is favorable if the device has at least one compressed-air nozzle which is directed onto the film in said window, preferably at an acute angle. The compressed air exerts a uniform pressure on the film, which removes any air bubbles between the film and the workpiece, so that the film is applied to the workpiece quickly, gently and without bubbles by means of the compressed air. If the compressed-air nozzle is aligned at an acute angle, the film lays particularly reliably against the workpiece from the first impact point of the compressed air.

For flexible use, even with larger workpieces, the winder module preferably has a concave recess in the direction of the support plate in which the space spanned by the film Window is located. The film is thus released in the window.

It is advantageous if the frame has four vertical linear guides, which store a lift frame vertically displaceable, which carries the Wicklermodul. As a result, the winder module is mounted easily and stable vertically displaceable.

In a particularly advantageous embodiment variant, the winder module has a U-shape with two legs, between which the laser head can be inserted, and a web connecting the legs, in which said window is located. Despite the small dimensions of the winder module, such a form creates a lot of space for the film and thus longer service life without film replacement, without restricting the necessary freedom of movement of the laser head.

Here are preferred in one leg of the unwinder with the wound on a coil film and a downstream Abwickler Niederhalterolle and other leg a second hold-down role for applying the tensioned between the hold-down rollers on the window to the workpiece, one of these downstream drive roller for Foil and the rewinder stored for the film. Such a division within the Wicklermoduls causes a particularly favorable utilization of space in the Wickler module and a safe Weiterfördern the film.

It is also advantageous if in one of the legs a radially movable dancer roll is mounted for uniform clamping of the film between unwinder and rewinder. The dancer roll helps to prevent the formation of wrinkles by uniformly tensioning the film and allows the film to be applied more uniformly to a workpiece and easier to lift off.

In order to fit well even on workpieces with non-planar surface or to cause a special voltage curve of the film in the window, preferably at least one of the hold-down rollers has different cross-section along its axis.

In a further preferred embodiment, the winder module is in a bearing plate of said U-shape, on which unwind and rewinders and the hold-down, drive and dancer rollers are each rotatably mounted on one side, and a mounted on the frame carrier plate in two, at which the Bearing plate releasably anchored and the drive roller via a clutch driving motor is mounted. The motor allows an automatic conveyance of the film after transfer printing a mark on a workpiece. Due to the division into two, only the bearing plate has to be removed during a film change, equipped with new film and then again anchored to the carrier plate, which can remain in the laser transfer printer. In this case, the loading of new film in view of the one-sided storage of unwind and rewinder and said hold-down, drive and dancer rolls from the other side is easy to do; Tedious threading a new film in the built-Winder module and also removing the entire device from the laser transfer printer is eliminated. Furthermore, on a second bearing plate with Unwinder and rewinder and the mentioned hold-down, drive and dancer rolls prepared a second film for rapid change and while eg a film with color particles of other color or adhesive property for other workpieces are kept.

It is particularly favorable if said coupling is a magnetic coupling. Such a magnetic coupling is friction-free and reliably couples the engine to the drive roller already when the bearing plate is anchored to the carrier plate.

It is advantageous if the winder module is mounted displaceably on the frame parallel to the support plate and transversely to the conveying direction of the film. In this way, the winder module can be subsequently aligned both with respect to a workpiece and with respect to the laser head. This increases flexibility in using the device.

For more economical use of the film, the device preferably has a drive unit and a controller, which is designed to lift the winder module by means of the drive unit for lifting the film from the workpiece after the transfer printing of a marking on a workpiece, the lifted film depending on a Continue to promote in the conveying direction extending length of the marking and lower the Wicklermodul using the drive unit for applying the film to another workpiece. The controller enables fully automatic laser transfer printing.

Alternatively or additionally, the device has a Verschubeinheit, wherein the controller is further formed is, after the transfer printing a mark on a workpiece in addition to or alternatively to the said further conveying the Wicklermodul using the Verschubeinheit depending on a transversely extending to the conveying direction width of the mark to move. In this way, film and its color particles are particularly well utilized, resulting in longer life of the film due to the lower consumption.

It is particularly advantageous if said control is formed by a control of the laser transfer printer. An additional control and an error-prone interface can be omitted in this way. The special control functions for the device can be combined in an activatable module of the controller.

In a second aspect, the invention provides a laser transfer printer having a platen for a workpiece and a laser head disposed over the platen which laser transfer printer is characterized by a device of the aforementioned type disposed between the platen and the laser head. With regard to the advantages and variants of the laser transfer printer, reference is made to the above comments on the device.

• Fig. 1 einen Ausschnitt eines Laser-Transferdruckers mit einer erfindungsgemäßen Vorrichtung zum Bereitstellen einer Farbpartikel-Folie in einer Perspektivansicht von schräg oben;
• die Fig. 2a und 2b eine Variante der Vorrichtung von Fig. 1 mit einer teilweise entnommenen Lagerplatte eines Wicklermoduls in einer Perspektivansicht von schräg links (Fig. 2a) bzw. schräg rechts (Fig. 2b) oben; und
• die Fig. 3a und 3b die Lagerplatte des Wicklermoduls der Fig. 2a und 2b in einer Perspektivansicht von schräg oben (Fig. 3a) bzw. mit eingelegter Farbpartikel-Folie in einer Seitenansicht (Fig. 3b).

The invention will be explained in more detail with reference to embodiments illustrated in the accompanying drawings. In the drawings show:

• Fig. 1 a section of a laser transfer printer with an inventive device for providing a color particle film in a perspective view obliquely from above;
• the Fig. 2a and 2 B a variant of the device of Fig. 1 with a partially removed bearing plate of a winder module in a perspective view obliquely from the left ( Fig. 2a ) or obliquely right ( Fig. 2b ) above; and
• the Fig. 3a and 3b the bearing plate of the winder module of Fig. 2a and 2 B in a perspective view obliquely from above ( Fig. 3a ) or with inserted color particle foil in a side view ( Fig. 3b ).

According to Fig. 1 a laser transfer printer 1 has a laser head 2. In the laser head 2 are a laser source 3, which is a laser beam (in Fig. 1 symbolized by an arrow) 4, and an optic 5 is arranged, which deflects the laser beam 4, for example by means of movable mirrors and / or lenses down and, if necessary, focused.

In the example of Fig. 1 is the laser head 2 on a support 6 of the laser transfer printer 1 vertically movable. Below the laser head 2, the laser transfer printer 1 has a platen 7 for a workpiece 8. In this example, the platen 7 covers a foot part F of the laser transfer printer 1; the foot part F contains, for example, a controller 10 for the laser transfer printer 1, which can be operated via a user interface 11. In general, the laser head 2 is covered during operation with a protective hood, not shown here.

Between support plate 7 and laser head 2, a device 9 for providing a color particle film 12 is arranged in the laser transfer printer 1. The device 9 has a frame 13 and a winder module 14, which is mounted vertically movable on the frame 13.

In laser transfer printing, which is one of the additive marking methods, color particles 15 (FIG. Fig. 3b ) brought to the workpiece 8 to the plant and fixed by local heating using the laser beam 4, a mark 16 of color particles 15 on the workpiece 8 permanently, ie transfer printed. At the recessed by the heating by the laser beam 4 points of the workpiece 8, the color particles 15 do not adhere.

The color particle film 12, which in the illustrated example is coated on one side and substantially homogeneously with the color particles 15, serves as the carrier for the color particles 15. Alternatively, the film 12 may be enriched with color particles 15 or may be composed of color particles 15 at all.

In the winder module 14, the film 12 is connected between an unwinder 17 and a rewinder 18 (FIG. Fig. 3a . 3b ) is stretched over a window 19 and can thereby be applied to the laser-transfer printing with their color particles 15 to the workpiece 8. The laser transfer printer 1 or its controller 10 then directs the optics 5 such that the laser beam 4 of the marking 16 correspondingly transfers color particles 15 from the film 12 to the adjacent workpiece 8. Due to the precisely focusable laser beam 4, very fine structures can be transferred to the workpiece 8 and thus markings 16 can be printed with high resolution, eg labels, logos, graphics, machine-readable codes or the like. If the film 12 from behind the workpiece 8 vertically - ie in the z direction - lifted, only the marker 16 remains on the workpiece eighth

Since the film 12 or its color particles 15 are consumed during transfer printing, the device 9 must continuously provide the laser transfer printer 1 with new, unused film 12. As explained below in connection with the example of Fig. 3a and 3b is explained in more detail, is the film 12 in the winder module 14, for example, manually at a workpiece change or by means of a motor 20 (FIG. Fig. 2a ), can be further promoted.

In the exemplary devices 9 of the Fig. 1 . 2a and 2 B the frame 13 each have four vertical linear guides 22 which are mounted on a base plate 21 and store a lifting frame 23 vertically displaceable, which in turn carries the Wicklermodul 14. The base plate 21 stabilizes the frame 13, but could alternatively a bare frame or the like. be omitted or even omitted. Furthermore, the frame 13 can have more or less than four, eg only two or even a single linear guide 22, or store the winder module 14 in another way - for example telescopically - vertically movable. Moreover, the lifting frame 23 of the frame 13 could be omitted. It is understood that in the illustrated example, the workpiece 8 is placed on the base plate 21, which then serves as a support plate of the laser transfer printer 1.

For vertical movement of the winder module 14 on the frame 13, the device 9 has a drive unit 24. The drive unit 24 could be separate, in the example shown However, formed by the vertically movable laser head 2 itself, with which the winder module 14 by means of a terminal 25 (FIG. Fig. 2a and 2 B ) is releasably coupled. In order to be able to couple the winder module 14 to the laser head 2 at any desired vertical distance, the laser head 2 has an optional vertical rail 26 (in the example of FIGS Fig. 2a and 2 B with an elbow 27 for mounting on the laser head 2), on which the clamp 25 acts.

For automatically providing the film 12 in the laser transfer printer 1, the device 9 optionally has a controller which may be formed by the controller 10 of the laser transfer printer 1 or may be a separate part of the device 9. The controller controls by means of the drive unit 24, the lifting of the Wicklermoduls 14 after the transfer printing a mark 16 on a workpiece 8, thereby lifting the film 12 from the workpiece 8. Thereafter, the film 12 is further conveyed by the controller by means of the motor 20.

Optionally, before the further conveyance of the film 12 by the controller or, for example, the operator, it is determined which length L is in the conveying direction 28 (FIG. Fig. 3b ) - ie in the x-direction ( Fig. 1 ) - the marker 16 has to further promote the film 12 as a function of the determined length L, that is, only so far that just a previously unused area of the film 12 can be used for the marking 16 on another workpiece 8.

Instead of further conveying the film 12 by means of the motor 20, which is optionally carried out automatically by means of the control, the film lifted off the workpiece 8 could 12, for example, manually or with a driver, which converts the vertical movement of the Wicklermoduls 14 during lifting by the drive unit 24 in a conveying movement of the film 12, be further promoted.

After further conveying the film 12, the winder module 14 is lowered by the controller by means of the drive unit 24 in order to apply the film 12 to the further workpiece 8.

The device 9 has in the example of Fig. 1 an optional compressed air nozzle 29, which is arranged on the winder module 14. With compressed air, the compressed air nozzle 29 can be supplied for example by a (not visible here) compressed air connection of the laser transfer printer 1. The compressed air nozzle 29 is directed to the film 12 in said window 19, u.zw. at an acute angle α. The compressed air exercises - manually or by the control activated - on the film 12 when applied to a workpiece 8 an additional, supporting the application pressure. For this purpose, if desired, further compressed air nozzles 29 can be provided for pressing the film 12 against a workpiece 8 or the compressed air nozzle (s) 29 can also be aligned at a normal angle to the film 12 in the window 19.

In a further optional embodiment, the winder module 14 on the frame 13 is parallel to the support plate 7 and transverse to the conveying direction 28 of the film 12 - ie in the y direction ( Fig. 1 ) - displaced. In this case, the winder module 14 relative to the lifting frame 23, this relative to the linear guides 22, the linear guides 22 relative to the base plate 21 or the frame 13 relative to the support plate 7 slidably be stored. In this way, after the transfer printing of a marking 16 onto a workpiece 8, the winder module 14 can be displaced transversely to the conveying direction 28 additionally or alternatively to the further conveying of the film 12, for example as a function of a width B of the marking 16, ie, so far that for the Mark 16 on another workpiece 8 just a previously unused area of the film 12 can be used.

Optionally, the device 9 for the said displacement of the winder module 14 in the y-direction has a displacement unit. In this case, e.g. determines the width B of the marker 16 of the said control, whereupon the control after lifting the film 12 from a workpiece 8 and before applying to another workpiece 8 controls the displacement of the winder module 14 by means of the Verschubeinheit in response to the determined width B. ,

If, during laser transfer printing, a larger minimum distance of the laser head 2 from the workpiece 8 and a smaller maximum diameter of the take-off or rewinder 17, 18 are sufficient, then the winder module 14 can be essentially cuboid; If, on the other hand, unwind and rewinders 17, 18 are to take up a film 12 of greater length or thickness and thus have a larger maximum diameter and / or the laser head 2 can be moved close to the workpiece 8 during laser transfer printing, then the winder module 14 has the same shape as in FIG Examples U-shape with two legs 30, 31, between which the laser head 2 introduced can be, and a leg connecting the legs 30, 31, 32, in which said window 19 is located.

In the example of Fig. 3a and 3b are stored in a leg 30 of the unwinder 17 with the wound on a spool 33 and a film 12 downstream of the unwinding first hold-down roller 34. In the conveying direction 28 is followed by a second hold-down roller 35 mounted in the other leg 31, so that the film 12 is stretched between the hold-down rollers 34, 35 over the window 19 and can be applied to a workpiece 8 in this area. As in the example of Fig. 3b For this purpose, the hold-down rollers 34, 35 optionally protrude slightly in the direction of the support plate 7 from the winder module 14. As an alternative or in addition, the winder module 14 can have a concave recess 36 for releasing the film 12 in the direction of the support plate 7, in which the window 19 spanned by the film 7 lies. In the other leg 31, one of the second hold-down roller 35 is further mounted downstream drive roller 37 and the winder 18 for the film 12.

It is understood that the hold-down rollers 34, 35 and the drive roller 37 are not absolutely necessary, but unwind and rewinder 17, 18 sufficient to provide the film 12.

In order to keep the film 12 under tension in the winder module 14, the unwinder 17 is optionally friction-braked and / or the winder 18 is driven by the drive roller 37 via a slip-loaded carrier, eg a belt 38 or the like. To a uniform tension of the film 12 between unwinder 17th and to ensure rewinder 18, 31 is an optional dancer roller 39 is mounted in one of the legs 30, which is radially movable and biased, for example, with a spring 40. Further dancer rollers 39 and additional guide rollers 41 for the film 12 can, as in the example of Fig. 3a and 3b shown to be provided in the two legs 30, 31 as needed.

Further, if desired, at least one of the hold down rollers 34, 35 may have different cross sections along their axes 42, 43, e.g. be concave, convex, conical and / or grooved, whereby for the film 12 in the window 19 a special shape for applying the film 12 to a workpiece 8 with a convex, concave or other non-planar surface or a particular voltage curve can be achieved.

Coming back to the example of Fig. 1 For example, the winder module 14 may be a cassette substantially closed except for the window 19. The cassette could be mounted on the frame 13 so as to be able to be detachably mounted in the manner of an exchangeable cassette with film 12, ready for simplified film exchange.

The Fig. 2a to 3b show an alternative example, in which the winder module 14 into a bearing plate 44 and on the frame 13 - here: the lifting frame 23 - mounted support plate 45 is divided into two parts. The bearing plate 44 has said optional U-shape; In the example shown, the support plate 45 is substantially congruent thereto, which is not absolutely necessary. On the bearing plate 44 are, as in Fig. 3a shown, unwind and rewinder 17, 18 and the said hold-down, Drive and dancer rollers 34, 35, 37, 39 and any deflection rollers 41 rotatably mounted on one side. On the support plate 45, the bearing plate 44 is releasably anchored and also the motor 20 mounted to further convey the film 12. The motor 20 drives the drive roller 37 via a coupling 46, such as a claw, toothed, friction or magnetic coupling. In this example, the bearing plate 44 and support plate 45 form in the anchored state no closed cassette as in the example of Fig. 1 but the winder module 14 is substantially completely open between the bearing plate 44 and the carrier plate 45.

The bearing plate 44 can be solved for example by means of optional handles 47 from its anchoring to the support plate 45, whereupon a used film 12 of unwind and rewinder 17, 18 and the rollers 34, 35, 37, 39, 41, which due to their one-sided Drehlagerung are all accessible from the other side, removed and a new slide 12 can be mounted. For this example, the coil 33 is inserted with new film 12 on an axis 48 of the unwinder 17, an empty spool 49 on an axis 50 of the winder 18 and the film 12 over the rollers 34, 35, 37, 39, 41 and the empty spool 49 pulled , The stocked in this way with new, eg different colored film 12 bearing plate 44 is releasably anchored thereto on the support plate 45, for example, bolted to this locked or latched to latch 51 of the support plate 45 releasably without tools. The latching pins 51 may, if desired, be designed such that they additionally support the take-off and rewinding 17, 18 and / or at least one of the rollers 34, 35, 37, 39, 41.

The device 9 optionally has a film end detector (not shown) which has one end of the film 12 - e.g. optically in the absence of color particles or a particular end mark or mechanically by complete unwinding of the film 12 from or blocking on the spool 33 - detects and outputs a warning to the operating personnel or the controller 10 upon detection.

It is understood that the device 9 can be combined with other functional units. For example, could on the support plate 7 or the base plate 21 of the device 9 carry a rotary drive for a rotationally symmetrical workpiece 8, which allows an all-round marking.

The invention is not limited to the illustrated embodiments, but includes all variants, combinations and modifications that fall within the scope of the appended claims.

Claims (16)

1. A device for providing a colour particle film in a laser transfer printer which has a laser head arranged above a supporting plate for a workpiece, characterized by:

   a mount (13) which is arrangeable between the supporting plate (7) and the laser head (2); and

   a winder module (14) which is mounted in a vertically movable manner on the mount (13) and in which the film (12) is tensioned across a window (19) advanceable between an unwinder (17) and a rewinder (18).
2. The device according to claim 1, characterized in that the winder module (14) has a clamp (25) for releasably coupling with a vertically displaceable laser head (2).
3. The device according to claim 1 or 2, characterized by at least one compressed air nozzle (29) which is directed at the film (12) in said window (19), preferably at an acute angle (α) .
4. The device according to any one of claims 1 to 3, characterized in that the winder module (14) has a concave recess (36) facing the supporting plate (7), in which recess the window (19) that the film (12) is tensioned across is located.
5. The device according to any one of claims 1 to 4, characterized in that the mount (13) comprises four vertical linear guides (22) which, in a vertically slidable manner, support a lifting frame (23) carrying the winder module (14).
6. The device according to any one of claims 1 of 5, characterized in that the winder module (14) has a U-shape with two legs (30, 31) between which the laser head (2) is insertable, and a bridge (32) connecting the legs (30, 31) in which bridge said window (19) is located.
7. The device according to claim 6, characterized in that, in the one leg (30), the unwinder (17) with the film (12) wound on a reel (33) and a first hold-down roller (34) downstream of the unwinder (17) are supported, and, in the other leg (31), a second hold-down roller (35) for bringing the film (12) which is tensioned across the window (19) between the hold-down rollers (34, 35) in contact with the workpiece (8), a driving roller (37) for the film (12) downstream of the second hold-down roller, and the rewinder (18) for the film (12) are supported.
8. The device according to claim 7, characterized in that a radially moveable dancer roller (39) for evenly tensioning the film (12) between the unwinder (17) and the rewinder (18) is supported in one of the legs (30, 31).
9. The device according to claim 7 or 8, characterized in that at least one of the hold-down rollers (34, 35) has a cross section which differs along the roller's axis (42, 43).
10. The device according to any one of claims 7 to 9, characterized in that the winder module (14) is divided into a bearing plate (44) having said U-shape, in which the unwinder (17) and the rewinder (18) and said hold-down, driving and dancer rollers (34, 35, 37, 39) are each rotatably mounted on one side, and a holding plate (45) mounted on the mount (13), on which holding plate the bearing plate (44) is releasably anchored and a motor (20) driving the driving roller (37) via a coupling (46) is mounted.
11. The device according to claim 10, characterized in that said coupling (46) is a magnetic coupling.
12. The device according to any one of claims 1 to 11, characterized in that the winder module (14) is mounted on the mount (13) in a manner slidable parallel to the supporting plate (7) and transverse to the advancing direction (28) of the film (12).
13. The device according to any one of claims 1 to 12, characterized by a driving unit (24) and a controller which is configured to lift the winder module (14), after transfer printing a mark (16) on a workpiece (8), by means of the driving unit (24) for raising the film (12) from the workpiece (8), to advance the raised film (12) depending on a length (L) of the mark (16) in advancing direction (28), and to lower the winder module (14) by means of the driving unit (24) for bringing the film (12) in contact with a further workpiece (8).
14. The device according to claim 12 or 13, characterized by a shifting unit, wherein the controller is further configured to shift, additionally or alternatively to said advancing, the winder module (14), after transfer printing the mark (16) on a workpiece (8), by means of the shifting unit depending on a width (B) of the mark (16) extending transversely to the advancing direction (28).
15. The device according to claim 13 or 14, characterized in that said controller is constituted by a controller (10) of the laser transfer printer (1).
16. A laser transfer printer with a supporting plate for a workpiece and a laser head arranged above the supporting plate, characterized by a device (9) according to any one of claims 1 to 15 which is arranged between the supporting plate (7) and the laser head (2).

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