EP0993414A1

EP0993414A1 - Reel arrangement

Info

Publication number: EP0993414A1
Application number: EP98916622A
Authority: EP
Inventors: Peter Koreska
Original assignee: Kores Holding Zug AG
Current assignee: Kores Holding Zug AG
Priority date: 1997-06-30
Filing date: 1998-04-28
Publication date: 2000-04-19
Also published as: WO1999001368A1; US6321816B1; JP2002507178A; BR9810954A

Abstract

The invention relates to a reel arrangement (8) for a device used to transfer film (2) which is on one side of a foil strip (1) onto a support. Said reel arrangement comprises: a pay-out reel (4) for supplying the foil strip (1); a take-up reel (5) which is coaxial to the pay-out reel (4), for receiving the foil strip after the film (2) has been transferred; and a slipping clutch (9) between both reels (4, 5), by means of which the pay-out reel (4) drives the take-up reel (5) by slipping. The slipping clutch (9) has radially sprung arms (30) which are rotationally fixed to the pay-out reel (4). These arms have engaging projections (28) which engage in a groove (26) on the face of the take-up reel (5). Said projections (28) rest in a friction lock against the groove walls (32, 33).

Description

Coil arrangement

The invention relates to a spool arrangement for a device for transferring a film present on one side on a film strip to a carrier, with an unwinding spool for the film strip, a winding spool coaxial to the unwinding spool for the film strip after transferring the film, and with a slip clutch between the two spools, to drive the take-up reel from slipping off the take-up reel.

Devices for transferring adhesive films or correction color films or coil arrangements therefor have become known in a wide variety of embodiments. For example, DE 37 36 367 C shows a hand-held device for transferring a film from a carrier film to a substrate, in which the band-shaped carrier film is unwound from a first spool, is passed over an application device where the film is placed on a substrate, for example paper, is transmitted, and then rewound on a second spool. The two coils are arranged separately from one another, and the tape level of the carrier film remains unchanged during the entire process. So the device as a handheld device is relatively unwieldy, because it has to be large due to the two coils arranged one behind the other and also has to be operated in a relatively uncomfortable hand position, the hand from above overlapping the back of the hand with the view of the transmission location.

Similar hand-held devices with unwinding and winding spools arranged one behind the other, with the disadvantages described, are disclosed in EP 427 870 A. In addition, this document also shows a hand-held device with a coaxial arrangement of the winding and unwinding spool, a slip clutch between the two spools being realized by a ball, against which the two spools are pressed axially by means of springs. This training leads, however, apart from the effort in the manufacture and the tedious assembly of the spring-loaded coils in the housing, also to a bulky height of the device.

Another hand-held device to be held and operated in a similar manner is known from US Pat. No. 5,380,395 A, in which the unwinding spool is simultaneously used as an application device for on the carrier tape overlying adhesive parts is used. Although the used tape is led out of the housing and can be cut off, the device as such is compact and small, but the tape protruding from the housing can be perceived as a hindrance. It is also not easy for the user to control the exact place of application.

EP 368 070 A also describes a hand-held device in which the axes of the take-up and take-up reel are inclined at an angle to one another. A kind of tooth coupling acts between the coil hubs, the one teeth being attached to separate elastic coupling pawls. As a result, the clutch realized in this way can slip at a correspondingly high breakaway torque by the teeth sliding over one another under the inward springs of the clutch pawls. However, this training is extremely complex and costly to manufacture, and the slipping moment can only be controlled with little accuracy.

DE 196 09 533 C1 discloses a gear arrangement for a take-up spool of a transfer dispenser, an annular sleeve being provided with an external toothing which meshes with an internal toothing on the spool core of the unwinding spool. As a result, the two coils are not arranged or cannot be coaxial, i.e. the axes of the two coils are provided at a distance from one another, which makes the connection to a unit in the sense of an exchangeable cassette more difficult and more expensive and increases the dimensions of the coil arrangement. The slipping of the take-up spool is achieved by means of radial support webs in one piece with the ring sleeve and spring webs projecting approximately at right angles from them, which rest against the inner circumference of the spool core of the take-up spool under resilient prestress. The torque range with regard to entrainment or slipping of the take-up reel cannot be precisely determined, in particular also taking into account dimensional changes of the affected parts in the event of temperature fluctuations, apart from the fact that the annular sleeve forming the slip clutch with the support and spring bars on the one hand and with the external toothing on the other hand is relatively complex to manufacture.

Finally, EP 377 085 A describes a device for applying an adhesive film with a coaxial arrangement of Unwinding and take-up reel is known, in addition, a friction or slip clutch between the two coils is effective. However, this is a (in particular magnetic) disc clutch, axially directed surfaces abutting one another and possibly slipping relative to one another. This device is also relatively imprecise and coarse in terms of torque control, so that there are band breaks. In this connection it should be mentioned that the transmission of torque is relatively critical in the transmission devices of the type in question here; when pulling the full tape from the supply or supply spool, when applying a correction color film or adhesive film or the like. on the respective base, this unwinding spool is driven, the latter being intended to drive the winding spool via the slip clutch, so that the film strip, from which the film has already been transferred, is correspondingly wound onto the winding spool. Strictly speaking, the drive of both spools takes place in the area of the application device, by moving the device over the base while pulling off the film strip so that it is unwound from the unwinding spool. The unwinding spool has a smaller tape winding diameter or spool hub diameter compared to the winding spool, so that at the same speed of the two spools a higher peripheral speed and thus tape speed is brought about on the winding spool. This is where the slip clutch comes into play, which must allow the take-up reel to slip through in order to achieve the same belt speeds on the take-up reel as on the take-up reel. The friction or slip clutch is to be dimensioned in an extremely narrow torque range, both at the beginning of the use of the device when there is still a full tape reel on the unwinding reel (whereas only one or two layers of the film tape are contained on the reel spool) , as well as towards the end of use, when almost all of the film tape is wound onto the take-up reel, so that there the tape roll has a correspondingly larger diameter, compared to the tape roll on the take-up reel, to ensure adequate tension in the film tape, so that the Tape neither led too loosely (and in particular wound into a loop outside the device) nor too strong is stretched (which would then tear). The slipping clutch should therefore ensure appropriate torque transmission or slipping if the friction is appropriately dimensioned. For this purpose, the aforementioned known designs have consistently proven to be too imprecise and unsuitable. Above all, it has been shown in tests that slip clutch systems, which are based on a resilient pretension of components, change the characteristic values relatively quickly due to signs of fatigue or temperature influences, in particular lose friction, so that the tape is no longer wound up.

It is now the object of the invention to provide a coil arrangement of the type mentioned at the outset which not only enables a compact and handy design and allows convenient control of the transmission process when using the associated device, but above all also reliably controls torque precisely over long periods of time -Transmission or determination of the breakaway torque allows so as to always keep the film strip under an adequate tension, without this tearing, and without a loose loop can arise.

The coil arrangement according to the invention of the type mentioned at the outset is characterized in that the slip clutch has at least one radially resilient arm which is connected in a rotationally fixed manner to one coil and which engages with an engagement projection in an end-face link guide on the other coil, the resilient arm being radial is deflectable inwards and outwards.

In the coil arrangement according to the invention there is thus a slip clutch, which is based on the fact that the resilient arm or arms engage in the link guide and thus bring about a frictional entrainment of the take-up spool, wherein the frictional engagement in the link guide can take place radially inside and outside; in particular, the resilient arms can be deflected slightly radially inwards and outwards from their relaxed rest position in the course of a relative rotation between the coils, ie they can be elastically deformed; the friction values on the outside or inside of the link guide can vary, but the overall friction can be approximately constant, even if there are dimensional changes due to temperature fluctuations. Furthermore, not only a compact coil unit, in particular in an interchangeable cassette version, which can be used in the pre-assembled state in the respective device, but it can also accommodate the radially acting slip clutch to save space (so that a low overall height of the device can be achieved) and in terms of torque definition be dimensioned so that a safe function of the device, with an always adequately tensioned film strip, is obtained. Tear of the film strip is prevented as well as loose loops outside the housing of the device.

For the desired compact design, it has proven to be advantageous if the resilient arm is connected to the unwinding spool and the link guide is provided on the winding spool.

The link guide could be formed by a separate component, which is connected to the other coil, preferably the winding-up coil, in any manner, for example via a wedge connection, in a rotationally fixed manner. However, with a view to simple manufacture, in particular by injection molding, it is particularly advantageous if the link guide is formed by an end groove on the other coil.

In practical trials, it has also been found to be a particularly advantageous compromise with regard to, on the one hand, the simplest possible manufacture by injection molding and, on the other hand, the smoothest, most reliable turning or slipping of the take-up spool relative to the supply spool if three resilient arms are provided at angular intervals of 120 ° each.

In order to achieve a defined frictional engagement of the resilient arm or arms with the link guide or end groove, it is also advantageous if the or each resilient arm is designed with an axially projecting engagement pin parallel to the axis of the coils. The engagement pins are preferably cylindrical, and due to their good dimensionability, even in the case of manufacture by injection molding, they can be used to ensure a frictional engagement that is well defined within comparatively narrow limits with elastic deflection of the resilient arms. In the case of several resilient arms, the engagement pins are also provided. preferably, with a view to an unproblematic production, arranged according to an imaginary circle.

In practice, it has also proven to be advantageous if the or each resilient arm is directed with the freely projecting end against the direction of rotation during a relative rotation between the two coils.

The one or more resilient arms can be molded in one piece with the one spool, preferably the unwinding spool, for reasons of simple manufacture of the individual components and also in order to adjust the spring characteristics within the slip clutch to certain conditions, e.g. To be able to adapt to different foil strips, it is particularly advantageous if the or each resilient arm is formed on a ring which is arranged on the hub of the one spool in a rotationally fixed manner. In order to achieve a rotationally fixed locking in a simple manner, while avoiding slippage between the ring and the coil, it is furthermore advantageous if the ring has at least one projection on its radially inner side which engages in a recess on the hub circumference of the one coil.

In itself, it would also be conceivable to arrange a plurality of radially resilient arms with their sections engaging in the link guide in the rest position on different radii and to make the link guide circular for the resilient arms. With regard to simple manufacture and, moreover, uniform guidance of the arms during the relative rotation between the coils, it has proven to be particularly advantageous if the link guide has a shape deviating from a circular shape in plan view. Here, the resilient arms are alternately deflected alternately radially inwards and radially outwards, for which purpose the link guide can be, for example, a corrugated, self-contained, otherwise generally circular guide; the corrugation superimposed on the circular shape is to be designed in relation to the positions of the resilient arms such that at least one resilient arm is always deflected radially outward and at least one resilient arm is deflected radially inward at any given time, so that there is always a corresponding friction to achieve the backdrop guide by resilient preload, which take the take-up spool with the supply spool up to the specified torque at which the resilient arms are radially adjusted from their current positions when the slide guide slides over it while overcoming the friction. However, it is particularly favorable here with regard to a smooth process and a bumpless take-along of the take-up spool if the slide guide has an elliptical shape in plan view.

Studies have shown that in order to achieve the friction necessary for taking the take-up reel under slipping in the required torque range, a surprisingly small deflection of the resilient arms is sufficient or has to be provided in the embodiment mentioned above, and it is particularly advantageous here if the extent of the deflection the resilient arms radially inward and radially outward is approximately 0.3 to 0.5 mm, preferably approximately 0.4 mm. In a practical embodiment, the resilient arms with their engagement sections, in particular the engagement pins, can lie on a circle, and the link guide can, for example, have an elliptical shape, the long axis of which is approximately 0.4 mm larger than the circle diameter, and the latter small axis is about 0.4 mm smaller than the circular diameter of the resilient arms. This results in a deflection of the resilient arms by approximately + 0.4 mm during the relative rotation between the coils.

Experiments have shown, on the other hand, that slip clutch systems, which are based on a resilient pretensioning of components, can change the characteristic values due to signs of fatigue or temperature, in particular lose friction, so that the tape is no longer wound up.

A particular object of the invention is therefore to design the present coil arrangement so that it not only enables - as mentioned - a compact and handy design and allows convenient control of the transmission process when using the associated device, but above all also over long periods of time and in wide temperature ranges, reliably enables exact control of the torque transmission or determination of the breakaway torque, so as to always keep the film strip under adequate tension without it tearing and without a loose loop being able to form. In order to achieve this, it is particularly advantageously provided that the link guide is circular and has a radially inner wall and a radially outer wall, and that the or each engagement projection rests on both walls. In this coil arrangement there is thus a slip clutch which is based on the friction due to the mere abutment of the engagement protrusion (s) both radially inside and radially outside on the respective wall of the link guide, without a spring preload of the spring arm or arms being present or being necessary . If the diameter of the walls changes, for example increases, when the temperature changes, for example an increase in temperature, the resilient arms follow, if necessary at all, due to their resilient deflection of this temperature expansion or contraction, the spring force that occurs can be small relative to the friction force already present , so that the overall friction and thus the breakaway torque changes only slightly. The resilient arm or arms also make it possible in the present case that any deviations in the coaxial arrangement of the coils, for example due to tolerances and / or different play, can be compensated for by the resilient arm or arms during the relative rotation between the coils can be deflected radially inwards or outwards from their relaxed rest position as required, ie can be elastically deformed, but nonetheless they always lie both radially on the outside and radially on the inside with their engagement projection or with their engagement projections.

The link guide could be formed by a separate component, which is connected to the other coil, preferably the winding-up coil, in any manner, for example via a wedge connection, in a rotationally fixed manner.

For simple manufacture of the coil arrangement, in particular by injection molding the individual parts with tight tolerances, it is also advantageous if the bottom of the groove forming the link guide is part of a disk-shaped base body of the other coil, from which the walls and a tape winding cylinder project axially on one side .

Here too, the resilient arm or the resilient arms can both form their own coupling body, which is coupled as a separate component with the one coil in a form-fitting manner, and also be formed in one piece with the one coil, preferably the unwinding coil, in order to implement the rotationally fixed connection.

In order to ensure that there is always a frictional engagement of the engagement projection or engagement projections between the walls of the link guide, while resting against both walls, even with temperature-related dimensional changes, it is also advantageous if the engagement engagement or each projection with a slight press fit between the walls of the circular link guide is recorded.

The engagement pins are preferably circular-cylindrical, and due to the good dimensionability, even in the case of manufacture by injection molding, a frictional engagement that is well defined within comparatively narrow tolerances can be achieved.

In practice, it has also proven to be advantageous if the link guide has a width of 2 mm, with a tolerance of 0 to - 0.005 mm, and the or each engagement projection has a thickness, measured in the radial direction of the coils, of 2 mm , with a tolerance of 0 to + 0.005 mm.

ABS has proven to be particularly favorable as the material for the resilient arm (s), possibly the ring carrying it, and the coils. Coil assemblies made from this plastic material not only have the desired long service life, the required friction is also achieved with sufficient accuracy in the area of the slip clutch.

The invention also relates to a device for transferring a film present on one side on a film strip to a carrier, which is provided with a spool arrangement according to the invention.

The invention is explained in more detail below on the basis of preferred exemplary embodiments illustrated in the drawing, to which, however, it should not be limited.

Show it:

Fig.l is a view of a device for transferring a correction film with the upper housing cover removed to show the included coil arrangement;

2 shows a section along the line II-II in Fig.l, on a somewhat larger scale;

3 shows a view of the side facing the take-up reel the unwinding spool of the spool assembly;

4 shows an axial section through this unwinding reel according to the line IV-IV in Figure 3;

5 shows a plan view of the take-up spool, to illustrate the side facing the take-up spool;

6 shows an axial section through this take-up reel according to line VI-VI in FIG. 5;

7 is a plan view of the generally annular coupling body acting between the coils;

8 shows a view of this coupling body;

Fig. 9 is a plan view of a modified take-up spool, showing the side facing the take-up spool;

10 shows an axial section through this take-up reel according to the line X-X in FIG. 9;

11 shows a plan view of the generally annular coupling body acting between the coils; and

12 shows a view of a part of a resilient arm of this coupling body.

FIG. 1 shows a device for transferring a film 2, which is present on one side on a film strip 1, from the latter onto a carrier, the upper housing part being lifted off; Fig.2 shows a section along the line II-II in Fig.l, with the upper housing part 3b is attached.

The film strip 1 is rolled up on an unwinding spool 4, one side of this film strip 1 being covered with the film 2, which comprises, for example, a correction substrate which can be applied in dry form over a text to be corrected and then overwritten. In the same way, the film strip 1 can also be covered with an adhesive or dye film. FIG. 1 shows an already relatively empty reel spool 4, which is arranged coaxially with a take-up spool 5, cf. also FIG. 2: the film strip 1 is passed from the unwinding reel 4 via a first deflection guide 6a and from there around an application device 7; the film strip 1 is rotated about its longitudinal axis by 90 °. In this way, the film strip 1 can be sharply deflected on a front edge of the application device 7, which is designed as a tear-off edge 10 and protrudes from the housing 3, the film 2 can be transferred to a carrier, such as paper or the like, as indicated by dashed lines in Fig.l. Thereafter, the film strip 1 is guided around a second deflection guide 6b, whereby it is rotated through 90 ° again, and then guided onto the winding reel 5 and rolled up thereon. The two coils 4, 5 thus form a coaxial coil arrangement 8, which as such forms a manageable structural unit, as will be explained in more detail below.

The application device 7 is tongue-shaped and is fixed at the end lying inside the housing 3 on both sides of the lower part 3a thereof, this fixing possibly being detachable at least on one side, as will be described below.

The end of the application device 7 protruding from the housing 3 has two parallel, approximately triangular side boundaries 15, which on the one hand are intended to prevent the film strip 1 from sliding sideways and on the other hand, as can be seen in particular in FIG the film 2 from the film tape 1 and transferring the film 2 to the support pad. Further guides - as shown in FIGS. 1 and 2 and designed as pin-shaped projections 16 - can also be provided on the application device 7.

The application device 7 will give way due to the tongue-like design and its one-sided attachment when it is guided over the carrier, for example paper, whereby on the one hand the contact pressure on the carrier is controllable and on the other hand there is a somewhat wider contact area. The tear-off edge 10 is designed as a rounded edge with a small radius in order to enable the film 2 to be detached from the film strip 1 in a defined manner. This is particularly important for the application of a correction film on a defective text area, so that it is possible to cover only the actually defective text area. The slight rounding of the edge also means that when the film 2 is applied to the carrier, on the one hand this carrier, which may be thin copy paper, is not injured, and on the other hand the risk of the film strip 1 tearing is reduced during this application process. The unwinding spool 4 and the winding spool 5 are, as mentioned, and as can clearly be seen from FIG. 2, mounted coaxially one above the other on an axle 18 fixed to the housing; the unwinding process of the film strip 1 from the unwinding spool 4 is effected by pulling the film strip 1 when the film 2 is applied to the carrier. The winding of the film strip 1 onto the take-up spool 5 is achieved due to the friction via a slip clutch 9 provided on the two spools 4, 5 by the movement of the unwinding spool 4.

Fig.l, which shows the device - here as a hand-held device for applying a correction film - compared to its natural size in a slight enlargement, makes it clear that the handling of the device is primarily due to the space-saving arrangement of the unwinding and winding spool 4, 5 is ergonomically convenient and makes it easier for the user to check the order of the film 2 on the carrier, since this is clearly visible. The device with its compact coil arrangement 8 lies comfortably in the hand during the application process. For better guidance of the device, a recess 17 is provided on the upper housing part 3b (see FIG. 2), into which a finger, for example the thumb of the user, can be placed.

3 and 4 show a supply reel 4 in plan view or in section along the line IV-IV in Fig.3. The unwinding spool 4 is designed as a wheel-shaped disk with spokes 14 with a central sleeve (hub) 19 provided for receiving the axle 18. The middle sleeve 19 protrudes on both sides beyond the disk 14, the film strip 1 initially being wound on the upper sleeve part 19a (“above” in relation to the sections shown in FIGS. 2 and 4) (cf. in particular FIG. 2, in which a still relatively large tape winding is shown on the reel 4). The lower sleeve part 19b works via the slip clutch 9, which comprises a clutch body 20 shown only schematically in FIG. Fig. 7 and 8 or Fig. 11 and 12, together with the take-up spool 5 so as to ensure - via the slip clutch 9 - the entrainment of the take-up spool 5 as it slips. This lower sleeve part 19b is provided with at least one recess, also in the area of an all-round, stepped projection 21, in the exemplary embodiment shown with three recesses 22 which are provided with corresponding The radially inner projections 23 of the annular coupling body 20 - hereinafter referred to as coupling ring 20 for short (see FIGS. 7 and 8 or 11 and 12) - cooperate in a rotationally fixed manner with the unwinding spool in the state placed on the lower sleeve part 19b 4 to lock.

5 and 6, an embodiment of the take-up spool 5 is shown, which is generally similar to the take-up spool 4, and both spools 4, 5 are light and yet stable, partly due to the skeletal shape of the support surface 24 of the take-up spool 5.

In the assembled state of the coil arrangement 8, see. 2, the two coils 4, 5 lie axially one behind the other, and in this configuration they are held together non-positively via the coupling ring 20, so that they form a unit which can be manipulated as such.

For this purpose, the take-up reel 5, as can be seen from FIGS. 5 and 6, has a link guide 25 which, in the exemplary embodiment shown, is formed by an end-side, elliptical groove 26 with radially inner and outer groove walls at a constant distance from one another. In FIG. 5, the imaginary elliptical center line of the front groove 26 is also shown with a broken line 27, this center line 27 deviating from a corresponding circular shape in such a way that the horizontal long axis of the ellipse in FIG 1 mm larger than the short ellipse axis, vertical in Fig. 5.

On the other hand, the coupling ring 20 has engagement projections in the form of generally cylindrical engagement pins 28, see. 7 and 8, the centers of which lie on a circular line illustrated in FIG. 7 with broken line 29; the diameter of this circular line 29 lies exactly in the middle between the lengths of the short axis and the long axis of the ellipse 27 according to FIG. 5.

The engagement pins 28 are formed on the free ends of resilient arms 30 extending in the circumferential direction, which in turn are molded on the outside of a ring 31 at angular intervals of 120 °. This ring 31 forms, together with the resilient arms 30, the aforementioned coupling ring 20. When the engaging pins 28 engage in the groove 26 on the take-up reel 5, one of the resilient arms 30 is always out of its rest position shown in FIG. 7, in which the engaging pins 28 lie stress-free on the circular line 29 with their centers, deflected radially inward, and another resilient arm 30 is deflected radially outwards. Due to these deflections or the given elastic deformations, the engagement pins 28 are always with a certain force on one or the other wall of the groove 26, but nevertheless the resilient arms 30 with the engagement pins 28 are present in the rest position without pretension, so that a frictional entrainment of the take-up reel through the take-up reel with defined slipping over long operating times and is also ensured when the individual plastic components are exposed to higher temperatures.

In FIGS. 10 and 11, a somewhat modified on coil 5 is shown, which likewise has a link guide 25, which is formed by an end-side circular groove 26, the radially inner and outer groove walls of which are designated 32 and 33, respectively. These groove walls 32, 33 are at a constant distance from one another. On the other hand, the coupling ring 20 in turn has engagement projections in the form of generally cylindrical engagement pins 28, see. 11 and 12, the centers of which lie on the circular line not shown in FIGS. 9 to 11 (see FIG. 29 in FIG. 7); these engagement pins 28 are again formed on the free ends of resilient arms 30 extending in the circumferential direction, which in turn are molded on the outside of a ring 31 at angular intervals of 120 °. Together with the resilient arms 30, this ring 31 forms the coupling ring 20.

When the engaging pins 28 engage in the circular groove 26 on the take-up reel 5, all the resilient arms 30 are normally in their rest position, in which the engaging pins 29 lie stress-free with their centers on a circular line which defines the center of the circular groove 26. which is schematically illustrated with its walls 32, 33 in FIG. 11 for the engagement pin 28 at the bottom right of the figure. As can be seen, the engagement pin 28 (and any other engagement pin 28) lies both radially on the inside of the inner wall 32 and radially on the outside against the wall 33, in one slight press fit, so that a frictional entrainment of the take-up spool 5 is ensured by the unwinding spool 4 with defined slipping, even when the individual plastic components are exposed to higher temperatures.

In a tested practical embodiment according to FIGS. 9 to 12, the inner wall 32 of the groove 26 or link guide 25 had a diameter of 23 mm, the outer wall 33 had a diameter of 25 mm, so that the width of the groove was 2 mm gave a tolerance of 0 to - 0.005 mm; the engagement pins 28 were circular cylindrical, with a diameter of 2 mm, with a tolerance of 0 to + 0.005 mm.

The engagement projections or pins 28 are preferably circular cylindrical, but they can e.g. also be elliptical in cross section. The only important thing is that they fit tightly into the groove 26 without play and, due to the light press fit thus given, result in a defined friction both inside and outside on the walls 32, 33.

From FIGS. 9 and 10 it can also be seen that the disk-shaped base body 24 is formed without openings in this embodiment, apart from the central bearing opening 34 for plugging onto the axis 18 (FIG. 2). Furthermore, a cylinder 35 for winding the film strip 1 can be seen from FIGS. 9 and 10.

, If, during operation, the film strip 1 is pulled off the unwinding or supply spool 4 by moving the application device 7 with the tear-off edge 10 over a base, it takes the winding spool 5 frictionally with the coupling ring 20, so that the empty film strip 1 is under tight leadership is wound up there. The resilient arms 30 are in the ideal state without tension, and the take-up of the take-up spool 5 takes place only by the slight press fit of the engagement projections or pins 28 between the walls 32, 33 with bilateral contact with the latter. Should there be a slight mutual displacement of the coils 4, 5 due to tolerances, especially in the area of the axis 18 or the bearing openings receiving them, for example 34, or should the coils 4, 5 be subject to dimensional changes due to temperature fluctuations , the resilient arms 30 can compensate for this by fixed provide deflection in the required direction, nonetheless the friction of the engagement projections 28 in the link guide 25 determines the driving torque or the breakaway torque within the desired narrow range.

The resilient arms 30 with the engagement pins 28 can also be integrally formed on the unwinding spool 4, in which case the spool hub 19 itself can form the basis for the arms 30.

Any suitable plastic material can be used as the material for the described parts, namely the coils 4, 5 and the coupling ring 20; In practical tests, particularly good results could be achieved with ABS.

Claims

Claims:

1. Coil arrangement (8) for a device for transferring a film (2), which is present on one side on a film strip (1), to a carrier, with an unwinding spool (4) for the film strip, and a reel (5) for the film strip, which is coaxial with the unwinding spool after transfer of the film, and with a slip clutch (9) between the two coils (4, 5) in order to drive the take-up reel (5) from the unwinding reel (4) by slipping, characterized in that the slip clutch (9) Has at least one radially resilient arm (30) which is connected to the one coil (4) in a rotationally fixed manner and which engages with an engagement projection (28) in an end link guide (25) on the other coil (5), the resilient arm (30) can be deflected radially inwards and outwards.

2. Coil arrangement according to claim 1, characterized in that the resilient arm (30) is connected to the unwinding spool (4) and the link guide (25) is provided on the winding spool (5).

3. Coil arrangement according to claim 1 or 2, characterized in that the link guide (25) is formed by an end groove (26) on the other coil (5).

4. Coil arrangement according to one of claims 1 to 3, characterized in that three resilient arms (30) are provided at angular intervals of 120 °.

5. Coil arrangement according to one of claims 1 to 4, characterized in that the or each resilient arm (30) is formed with an axially projecting engagement pin (28) parallel to the axis of the coils (4, 5).

6. Coil arrangement according to claim 5, characterized in that the or each engagement pin (28) is cylindrical.

7. Coil arrangement according to claim 5 or 6, characterized in that the engagement pin (28) according to an imaginary circle (29) are arranged.

8. Coil arrangement according to one of claims 1 to 7, characterized in that the or each resilient arm (30) is directed with the freely projecting end against the direction of rotation with a relative rotation between the two coils (4, 5).

9. Coil arrangement according to one of claims 1 to 8, characterized in that the or each resilient arm (30) on a ring (31) is integrally formed on the hub (19) of the one coil

(4) is arranged rotatably.

10. Coil arrangement according to claim 9, characterized in that the ring (31) on its radially inner side has at least one projection (23) which engages in a recess (22) on the hub circumference of the one coil (4).

11. Coil arrangement according to one of claims 1 to 10, characterized in that the link guide (25) has a shape deviating from a circular shape in plan view.

12. Coil arrangement according to claim 11, characterized in that the link guide (25) has an elliptical shape in plan view.

13. Coil arrangement according to one of claims 11 or 12, characterized in that the extent of the deflection of the resilient arms

(30) radially inward and radially outward is approximately 0.3 to 0.5 mm, preferably approximately 0.4 mm.

14. Coil arrangement according to one of claims 1 to 10, characterized in that the link guide (25) is circular and has a radially inner wall (32) and a radially outer wall (33), and that the or each engagement projection (28 ) on both walls (32,33).

15. Coil arrangement according to claim 14, characterized in that the bottom of the slot guide (25) forming groove (26) part of a disc-shaped base body of the other coil (5) from which the walls (32, 33) and a tape winding cylinder (35) project axially on one side.

16. Coil arrangement according to claim 14 or 15, characterized in that the engagement projection (28) with a slight press fit between the walls (32,33) of the circular link guide (25) is received.

17. Coil arrangement with one of claims 14 to 16, characterized in that the link guide (25) has a width of

2 mm, with a tolerance of 0 to - 0.005 mm, and the or each engagement projection (28) measured a thickness in the radial direction of the coils (4.5), of 2 mm, with a tolerance of 0 to +0.005 mm , Has.

18. Coil arrangement according to one of claims 1 to 17, characterized in that the resilient arm or arms (30) and the coils (4,5) consist of ABS.

19. Device for transferring a film (2), which is present on one side on a film strip (1), on a carrier, with a coil arrangement (8) according to one of claims 1 to 18.