EP0907602A1

EP0907602A1 - Device for transferring a film located on one side of a foil strip

Info

Publication number: EP0907602A1
Application number: EP97922751A
Authority: EP
Inventors: Peter Koreska; Robert Koreska
Original assignee: Kores Holding Zug AG
Current assignee: Kores Holding Zug AG
Priority date: 1996-06-05
Filing date: 1997-06-02
Publication date: 1999-04-14
Also published as: WO1997046475A1; BR9709642A; JP2000514725A

Abstract

A device for transferring a film (2) located on one side of a foil strip (1) from the foil strip to a substrate has a housing (3) which contains a feeding reel (4), a take-up reel (5), deflecting guides (6) and an applicator (7) which projects at least partially out of the housing (3). The foil strip (1) is fed by the feeding reel (4), is guided through the applicator (7) and wound on the take-up reel (5), which is coupled to the feeding reel (4) by a friction coupling (9). The contact areas (13) of the friction coupling (9) with the feeding reel (4) and the contact areas (14) of the friction coupling with the take-up reel (5) are mutually offset in the radial direction. The friction coupling is in particular implemented with an O-ring (9).

Description

Device for transferring a film present on one side on a film strip

The invention relates to a device for transferring a film present on one side of a film strip from this film strip to a carrier, with a housing in which an unwinding spool, a winding spool coaxial therewith for the film strip and an application device at least partially protruding from the housing are provided, wherein the film strip carrying the film is unwound from the unwinding spool, guided over the application device and wound onto the winding spool connected via a friction clutch.

Devices for the transfer of adhesive films or correction color films have become known in a wide variety of designs. 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. Thus, the device as a handheld device is relatively unwieldy, since 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, with the hand hindering the view of the transmission location from above with the back of the hand.

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 take-up and take-up spool, a slip coupling 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 production and the tedious assembly of the spring-loaded coils in the housing, to an unwieldy height of the device.

Another one to be held and operated similarly Hand-held device is known from US Pat. No. 5,380,395 A, in which the unwinding spool also serves as an application device for adhesive parts resting on the carrier tape. 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 implemented in this way can slip with 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.

Finally, EP 377 085 A discloses a device for applying an adhesive film with a coaxial arrangement of the winding and unwinding spool, a friction or slip clutch also being effective between the two spools. 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 context it should be stated that the transmission of torque in the transmission devices of the type in question here is relatively delicate; When the full tape is pulled off the unwinding 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 friction clutch so that the film tape, from which the film is now has already been transferred, is correspondingly wound on the take-up reel. Both coils are thus driven Strictly speaking, in the area of the application device, by sliding the device over the base while pulling off the film strip, so that it is unwound from the unwinding spool. The unwinding reel has a smaller reel diameter or reel hub diameter compared to the reel spool, so that at the same speed of the two reels a higher peripheral speed and thus tape speed is brought about on the reel spool. This is where the friction clutch comes into operation, which has to slip accordingly in order to achieve the same belt speeds on the unwinding reel as on the winding reel. The friction or slip clutch is to be dimensioned in an extremely narrow range, on the one hand both at the beginning of the use of the device when there is still a full tape reel on the unwinding spool, and on the winding spool only one or two layers of the film tape are included, as well as towards the end of use, when almost the entire film strip 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 spool to ensure adequate tension in the film strip , so that the tape is neither guided too loosely (and in particular unwound into a loop outside the device) nor tensioned too much (in which case it would tear). Investigations have shown that an optimal range for the torque control is 40 to 60 Nm, and the friction clutch should ensure a corresponding torque transmission or slipping when this range is reached. For this purpose, the aforementioned known designs have consistently proven to be too imprecise and unsuitable.

The aim of the invention is to provide a device of the type mentioned at the outset, which is compact and also allows an exchangeable cassette design for the coils, which is handy and which allows convenient control of the transmission process during use; Above all, the invention also aims to enable precise control of the torque transmission or determination of the breakaway torque, so as to always keep the film strip under an adequate tension without it tearing and without a loose loop being formed can. The inventive device of the type mentioned is characterized in that the contact areas of the friction clutch with the unwinding spool and the contact areas of the friction clutch with the winding spool are arranged radially offset from one another. In the device according to the invention there is thus a radially acting friction clutch, the unwinding and winding spools with hub parts can be inserted one into the other. As a result, a compact coil unit, in particular in an exchangeable cassette version, can be obtained, which can be inserted into the housing of the device in the preassembled state. Furthermore, the radially acting friction clutch can be accommodated not only in a space-saving manner, so that a low overall height of the device can be achieved, but also can be dimensioned precisely with regard to the torque setting, so that a reliable function of the device is obtained with an always adequately tensioned film strip. Tear of the film strip is prevented as well as loose loops outside the housing of the device.

For the friction clutch, for example, sleeve-like coupling parts, which may also be stepped, could be used, but preferably the friction clutch is simply in the form of a ring, i.e. O-ring, especially made of plastic. In order to obtain additional options for dimensioning the torque transmission in the narrow range mentioned by a special shape with a spring action, the O-ring can be shaped wavy.

On the other hand, in order to allow the clutch to slip with resilient yielding (instead of elastic compression), it is also advantageous if the O-ring has resilient friction engagement teeth projecting axially from an annular body. In order to be able to control the friction effect particularly precisely, it is also advantageous if the friction engagement teeth are shaped with radially directed brake knobs.

It is also favorable for the torque setting if the friction engagement teeth are arranged in the circumferential direction between teeth provided for holding the O-ring in one of the coils.

With regard to an optimal choice of material with regard to friction properties and suspension properties, it has proven to be advantageous if the ring is made of polyoxymethylene.

For the pre-assembly of the ring as well as possibly both coils together with the ring, it is also advantageous if the ring is in a snap fit, e.g. with the help of an annular bead on which a coil is held.

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:

1 shows a view of a device according to the invention with the upper housing cover removed;

2 shows a section along the line A-A in Figure 1, on a somewhat larger scale;

3a shows a plan view of an unwinding spool;

3a shows an axial section through this unwinding reel according to line B-B in Figure 3a;

4a shows a plan view of a take-up reel;

4b shows an axial section through the take-up reel according to the line C-C in FIG.

5 shows a cross section of a friction clutch in the form of a corrugated O-ring;

6 shows a further embodiment of a ring friction clutch in front view, partially in axial section;

7 shows the friction clutch according to Figure 6 in plan view;

8 shows a half view of an assembly of a winding spool and an unwinding spool with the friction clutch according to FIGS. 6 and 7 in axial section; and

9 shows a modified embodiment of a ring friction clutch in a diagram.

1 shows a device for transferring a film 2 present on one side on a film strip 1 from the latter onto a carrier, the upper housing part being lifted off; Figure 2 shows a section along the line A-A in Figure 1, with the upper housing part 3a 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 is applied in dry form over a text to be corrected and can then be overwritten. In the same way, the film strip 1 can also be covered with an adhesive or dye film. 1 shows an unwinding spool 4 that is almost completely unrolled, the film strip 1 being guided over a first deflection guide 6a and being guided from there around an application device 7; the film strip 1 is thereby rotated about its longitudinal axis by 90 ". In this way, the film strip 1 can be sharply deflected on a front edge of the applicator device 7, which is designed as a tear-off edge 10 and protrudes from the housing 3, the film 2 on a carrier how paper or the like can be transferred, as indicated by dashed lines in Fig.1.

Thereafter, the film strip 1 is guided around a second deflection guide 6b, again being rotated through 90 °, and then guided onto a take-up reel 5 and rolled up thereon. 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 3b thereof, this fixing possibly being detachable at least on one side, as will be described further 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 slipping sideways and on the other hand, as can be seen in particular from FIG Represent the device while pulling the film 2 from the film strip 1 and transferring the film 2 onto the support base. Further guides can also be provided on the application device 7, as shown in FIGS. 1 and 2 and designed as pin-shaped projections 16.

Due to the tongue-like design and its one-sided attachment, the application device 7 will yield somewhat when it is guided over the carrier, for example paper, which on the one hand allows the contact pressure on the carrier to be controlled and on the other hand provides a somewhat wider contact surface. 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 just for applying a correction film to one defective text area so that it is possible to cover only the actually defective text area. The slight rounding of the edge also has the effect that when the film 2 is applied to the carrier, on the one hand this carrier, which may be thin copy paper, is not damaged, and on the other hand there is no risk of the film strip 1 tearing during this application process.

The unwinding spool 4 and the winding spool 5 are, as can be seen from FIG. 2, mounted coaxially one above the other on a housing-fixed axis 8; 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 on the take-up spool 5 is achieved due to the friction via the coupling surfaces provided on the two spools 4, 5 and engaging with a friction clutch by the movement of the take-up spool 4. The friction clutch is designed as a friction ring, as an O-ring 9.

The Fig.1, which shows the device according to the invention - here designed as a hand-held device for applying a correction film - compared to the natural size in a slight enlargement, makes it clear that the handling of the device in two ways, both due to the space-saving arrangement of unwinding and Take-up reel 4, 5, and also because of the guidance of the film strip 1 with twisting by 90 °, is ergonomically convenient and simplifies the checking of the application of the film 2 on the carrier for the user, since this is clearly visible. The device with its compact coil arrangement 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.

3a and 3b show an unwinding spool 4 in plan view or in section along the line BB in Fig.3a. The unwinding spool 4 is designed as a wheel-shaped disk 18 provided with spokes with a central sleeve (hub) 19 provided for receiving the axis 8. The middle sleeve 19 protrudes on both sides beyond the disk 18, the film strip 1 initially being wound on the upper sleeve part 19a, with reference to the section shown in FIG. 2, while the lower sleeve part 19b is shown in FIG a correspondingly shaped recess 20 engages in the take-up reel 5 (see FIGS. 2, 4a and 4b) in order to ensure that the take-up reel 5 is carried along by the radial friction clutch as it slips. An all-round projection 21 on the lower sleeve part 19b of the unwinding reel 4 and the outer wall surface 22 of this lower sleeve part 19b together with the inner wall surface 23 of a cylinder 25 carrying the supporting surface 24 for the film strip 1 to be wound on the winding reel 5 form a kind Coupling housing for receiving the O-ring 9 acting as a friction or slip clutch (Fig. 2, Fig. 5).

Locking notches 29, which are provided on the upper edge of the middle sleeve 19 of the supply reel 4 and which cooperate with corresponding projections 30 (see FIG. 2) provided on the upper housing part 3b, act as a rewind stop for film strip 1 that has already been unwound. Other known means as well Could be provided, such as locking members that snap into teeth provided on the supply reel 4, for example (not shown).

As can be seen from FIGS. 4 a and 4 b, the take-up spool 5 is designed similarly 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.

5 shows an advantageous embodiment of the O-ring 9 'transmitting the torque. In principle, the torque can of course also be transmitted in a different way due to friction; for example, radially acting coupling surfaces on the winding or unwinding spool can also be in direct contact with one another, it being possible for these contact surfaces to be present on the spool hubs. Friction-increasing intermediate layers or friction-increasing knobs or grooves can also be provided.

The O-ring 9 'shown in FIG. 5 has a corrugated cross-section, which, in contrast to a purely ring-shaped O-ring 9 (which - as can be seen from the above - could also be used), makes this O-ring 9' has isolated axial support areas which are spaced apart from one another in the circumferential direction. As can be seen from FIG. 5, the contact areas 13 effective with the unwinding spool 4 are in frictional engagement on the outer wall surface 22 serving as the coupling surface with respect to the unwinding spool 5, namely with the inner wall surface 23 serving as the coupling surface Contact areas 14 offset at an angle. The free spaces in between are also of different sizes. Thus, the contact pressure of the O-ring 9 'is determined not only by the hardness of the ring material (for example plastic, approx. 40 Shore), as in the case of a purely circular O-ring 9, but also by the shape, ie the number and depth the "waves". This change of contact surface and free space - and also offset for the coupling surfaces against each other - makes it possible to adjust the coupling very precisely, for example, to the length, thickness and tension of the film strip 1, to the compactness of the spools 4, 5 and to the desired use of the device.

The device allows, precisely because of the compact arrangement of the two coils 4, 5, to form them as an exchangeable cassette, and after removing the upper housing part 3b, the two coils 4, 5, which - as can be seen particularly well from FIG can be placed on the housing-fixed axis 8 without the need for an adjustment. After the application device 7 has been gently folded up, the film strip 1 can be placed around the snapping 26 (in FIG. 1), if necessary, around it and around the deflection guides 6a, 6b, after which the application device 7 is snapped back into the snapping 26. The film strip 1 can then be pulled loop-free by rotating the take-up spool 5 over an optionally provided knurled ring.

A viewing window 28 (FIG. 2) can be provided on the housing, in particular on the upper housing part 3b, which allows the user to control the amount of the film strip 1 which has not yet been unwound and is therefore still available.

The friction clutch shown in FIGS. 6 to 8 in the form of a modified O-ring 9 "consists of an annular body 31, on which friction engagement teeth 32 projecting in the axial direction are formed, which have brake knobs 33 on their inside. The brake knobs 33 are in this case, for example, formed as elevations approximately in the shape of a segment of a circle, as can be seen from FIG. 6 and the combination of the take-up spool 5 with the take-off spool 4 and the O-ring 9 "arranged in between according to FIG.

As indicated by the dashed line in Fig. 8, on be formed on the inner edge or on the inner wall surface 23 of the take-up spool 5, a semicircular ring bead 34, on which the outer upper edges of the teeth 32 can be supported, so that the 0-ring 9 ", which on the other side on a disk part of the spool 5th 8, in its position within the take-up reel 5 can be fixed by latching.

In the modified O-ring friction clutch 9 '' 'shown in FIG. 9, which is currently regarded as particularly favorable, only four diametrically opposed friction engagement teeth 32 are provided compared to FIG. 7, which are comparatively narrower and provided with brake knobs 33 , whereas the other teeth 32a lying between in pairs are wider, e.g. have the same width as the teeth 32 according to FIGS. 6 and 7, but have no brake knobs. The teeth 32a thus serve as a radial guide for the supply reel 4 or as a frictional connection to the take-up spool 5 and for holding onto the inside of the spool hub of the take-up spool 5, cf. the annular bead 34 shown in FIG. 8.

Suitable material for the O-ring 9 or 9 'or 9 "or 9"' is, for example, polyethylene (PE) or in particular polyoxymethylene (POM). In particular, the latter material (POM) has proven itself in experiments, above all with rings as shown in Fig. 9, proved to be particularly advantageous with regard to the required friction and suspension properties.

For resilient yielding when the take-up spool 5 slips relative to the - faster rotating - take-up spool, a gap 35 is also preferably provided on the outside of the teeth 32 in the embodiments according to FIGS. 6 to 9, for example by a corresponding shoulder on the Inside of the spool hub of the take-up spool 5, as can be seen from FIG. 8. This annular gap 35 has, for example, a radial dimension of 0.2 mm.

Claims

Claims:

1. Device for transferring a film (2), which is present on one side on a film strip (1), from this film strip to a carrier, with a housing (3) in which a supply reel (4), a coaxial take-up reel (5) for the film strip (1) and an application device (7) at least partially protruding from the housing (3) are provided, the film strip (1) carrying the film (2) being unwound from the unwinding spool (4), guided over the application device (7) and is wound onto the take-up spool (5) connected via a friction clutch (9), characterized in that the contact areas (13) of the friction clutch with the unwinding spool (4) and the contact areas

(14) of the friction clutch with the take-up spool (5) are arranged radially offset from one another.

2. Device according to claim 1, characterized in that the friction clutch is in the form of an O-ring (9; 9 '; 9 "; 9' '').

3. Apparatus according to claim 2, characterized in that the O-ring (9; 9 '; 9 "; 9' '') consists of plastic.

4. Device according to one of claims 2 or 3, characterized in that the O-ring (9 ') is wavy.

5. Device according to one of claims 1 to 3, characterized ge indicates that the O-ring (9 "; 9 '' ') axially projecting from a Ring¬ body (9"; 9' ''), resilient friction engagement Teeth (32).

6. The device according to claim 5, characterized in that the friction engagement teeth (32) are formed with radially directed brake knobs (33).

7. The device according to claim 5 or 6, characterized in that the friction engagement teeth (32) in the circumferential direction between for holding the O-ring (9 '' ') in one of the coils (5) provided teeth (32a) are arranged.

8. Device according to one of claims 2 to 7, characterized ge indicates that the ring (9; 9 '; 9 "; 9"') consists of polyoxymethylene.

9. Device according to one of claims 2 to 8, characterized in that the ring (9; 9 '; 9 ";9''') in one Snap fit on one spool (5) is held. Apparatus according to claim 9, characterized in that the snap fit is formed with the aid of an annular bead (34).