EP0380978A1 - Hand-operated device for transferring a film from a carrier foil onto a substrate - Google Patents

Abstract

A hand tool for applying on a substrate a film carried on a supporting film comprises a housing which contains a feed reel and a rake-up reel for the supporting film. The two reels are placed on pintles rotatably mounted in the housing. At least one reel is associated with a rewind stop, the two pintles are interconnected by toothing with a friction clutch which acts in the direction of rotation, and the supporting film, which can be wound off the feed reel, is guided on an applicator element which projects from the housing and presses the film side of the supporting film against the substrate. The supporting film then re-enters the housing and is wound onto the take-up reel. In order to improve such a hand tool by reducing the number of components and simplifying its manufacture, the toothing (18, 19) is incorporated in the corresponding pintle (8, 9) and the friction clutch forms and integral part of the toothing (18, 19).

Description

The invention relates to a hand-held device for transferring a film from a carrier film to a substrate with a housing, in which a supply spool and a take-up spool for the carrier film, each of which is attached to a pivot pin rotatably mounted in the housing, with at least one spool being assigned a backstop. the two pivot pins are coupled to one another via a toothing with a slip clutch which is effective in the direction of rotation and the carrier film which can be unwound from the supply reel has an application element which projects from the housing and is intended for pressing the carrier film with its film side onto the substrate and from there back into the housing on the Winding spool is guided.

In such known devices, as in the case of an audio tape cassette, a supply reel and a take-up reel are arranged lying next to one another in one plane, a carrier film coated with an adhesive film being wound on one side of the supply reel. The take-up reel, which is comparable to a tape cassette empty reel, is intended for receiving the used backing film. Both spools are arranged in an openable housing, which makes it possible to replace the supply spool and remove the take-up spool.

An outstanding application element is arranged on the outside of the housing, and the coated carrier film is guided over the edge thereof facing the substrate. This application element is placed on the substrate to which the adhesive is to be applied. Due to the relative movement between the device and the substrate, the adhesive film is separated from the carrier film, which at the same time is rewound without adhesive from the winding roll. Such a device is only functional if the carrier tape is sufficiently tensioned at all times. For this purpose, the supply reel and the take-up reel are connected to one another via a drive connection, which has a slip clutch. The drive connection is designed such that, as with a tape recorder, the take-up reel tries to rotate so quickly that it not only picks up the carrier tape pulled from the supply reel, but also keeps it taut.

Such a device is known for example from DE-OS 36 38 722. In this device, the drive connection is designed as a toothing, the two rollers being seated on pivot pins mounted in the housing. The gear of the pivot pin for the take-up spool is smaller than the gear of the pivot pin for the supply spool, so that the take-up spool inevitably rotates faster and thus tensions the carrier tape. While the gear for the take-up spool is formed in one piece with the corresponding pivot pin, the pivot pin for the supply roll and the corresponding gear wheel are designed as individual parts which are connected to one another via an elaborate slip clutch. The slip clutch consists of resilient pawls, which are attached to the drive gear, and a supply spool receiving mandrel with internally formed splined hub, in which the pawls engage. The drive connection with slip clutch is therefore relatively complicated and, in particular, of multiple parts, which makes the manufacture complex and therefore cost-intensive, which is a decisive disadvantage for such a mass article.

In contrast, the object of the invention is to improve such a handheld device in such a way that the number of components can be reduced and production can be simplified.

This object is achieved according to the invention with a hand-held device of the type mentioned at the outset in that the toothing is integrated in the pivot pin and the slip clutch is designed as part of the toothing.

This design reduces the number of components and simplifies manufacture, so that the manufacturer Development costs for such a handheld device can be significantly reduced. The hand-held device according to the invention only has one pivot pin each with integrated toothing for the supply reel or the take-up reel and does not require any additional elements for the slip clutch.

According to a very particularly preferred embodiment of the invention, it is provided that the teeth of the pivot pin for the supply spool are designed with lamellar tooth necks in the area between the ring gear and the tooth flanks, and that the teeth of both pivot pins are chamfered in the plane of the tooth flanks in the plane perpendicular to these are such that the teeth of the pivot pin for the supply spool can be slid over the teeth of the pivot pin for the take-up spool at a speed difference.

This design of the slip clutch is particularly simple. The slip clutch does not consist of a separate element, but is directly part of the toothing. The slanted teeth of the supply reel, which are resilient due to the lamellar design of their tooth necks, can slide over the correspondingly beveled teeth of the pivot pin for the take-up reel. The response of the slip clutch can be controlled via the spring properties of the teeth of the pivot pin for the supply spool. The spring properties are due to the design of the slats shaped tooth necks can be influenced, depending on the requirements, the length and thickness of the tooth necks and their lamella shape can be varied.

In connection with this configuration of the slip clutch, the invention further provides that the backstop is assigned to the toothing of the pivot pin for the supply spool, the backstop being particularly advantageously formed in the area below the beveled teeth as a correspondingly beveled housing element such that the teeth of the pivot pin can only be slid over the housing element in the direction of rotation. There is therefore no need for any additional devices to provide the backstop which prevents incorrect operation of the device, rather only a beveled, tooth-shaped housing element is necessary, over which the resilient teeth slide in the direction of rotation, but are blocked in the opposite direction of rotation.

• Fig. 1 in einer perspektivischen Explosionsdarstellung ein erfindungsgemäßes Handgerät,
• Fig. 2 eine erfindungsgemäß ausgestaltete Antriebsverbin­dung des Gerätes,
• Fig. 3 einen Schnitt gemäß der Linie III-III in Fig. 2,
• Fig. 4 einen Schnitt gemäß Pfeil IV in Fig. 2 und
• Fig. 5 einen Schnitt gemäß der Linie V-V in Fig. 2.

The invention is explained below with reference to the drawing, for example. This shows in

• 1 is a perspective exploded view of a handheld device according to the invention,
• 2 shows an inventive drive connection of the device,
• 3 shows a section along the line III-III in FIG. 2,
• Fig. 4 shows a section according to arrow IV in Fig. 2 and
• 5 shows a section along the line VV in FIG. 2nd

A hand-held device for transferring a film from a carrier tape 1 to a substrate 2, which is only indicated, has a housing which is formed by two housing halves, by a lower housing half 3a and an upper housing half 3b. The two housing halves 3a and 3b can be plugged together into a common housing by means of pins 4 in the housing half 3b and corresponding pin receptacles 5 of the housing half 3a.

Two bearing pins 6, 7 for pivot pins 8, 9 are formed in the lower housing half 3a. In this case, an annular support 10 is additionally formed in the foot region of the bearing journal 6. The housing also has an outstanding application element 11 for the carrier tape 1, which is formed by triangularly tapering guide strips 12a and 12b in both housing halves and an application roller 13. This application roller 13 is rotatably supported in a pin which is formed from a pin 14 of the housing half 3b and a sleeve 15 of the housing half 3a, this pin when the housing halves are joined together arises.

Furthermore, gripping surfaces 16a, 16b are formed on the outer surfaces in both housing halves. In addition, the housing half 3b in the region facing the bearing pin 6 has an elongated hole-shaped opening 17 through which one can look into the interior of the housing.

The pivot pins 8, 9 are formed in one piece with a toothing 18 or 19, wherein teeth 20 of the toothing 18 are larger than teeth 21 of the toothing 19. In addition, a disk-shaped plate 22 is formed on the foot of the pivot pin 9 below the toothing 19. The pivot pins 8, 9 are correspondingly attachable to the journals 6, 7 and, after the housing halves 3a, 3b have been joined together, are rotatably mounted in engagement with one another without axial play, and corresponding bearing devices, which are not shown, can also be formed in the housing half 3b.

A supply spool 23 carrying the carrier tape 1 can be plugged onto the pivot pin 8 and a take-up spool 24 winding the carrier tape 1 after applying the adhesive to the substrate 2 onto the pivot pin 9, the spools being connected in a rotationally fixed manner to the pivot pins, as shown in the drawing is not shown in detail.

The functionality of the hand-held device is produced by assembling all the individual parts shown in an exploded view in FIG. 1. The pivot pins 8, 9 are axially secured on the journals 6, 7 by means of locks, not shown. A supply spool 23 completely provided with a carrier tape and the take-up spool 24 receiving the beginning end of the carrier tape 1 are correspondingly placed on the pivot pins 8 and 9 when the handheld device is refilled, the carrier tape then starting from the supply roll 23 in the form shown in the drawing the application element 11 is guided around out of the housing and from there is passed back onto the take-up roll 24. The carrier tape 1 is guided around the guide strips 12a, 12b and the application roller 13. By placing the upper housing half 3b, the handheld device is ready for operation, the amount of carrier tape 1 still rolled up on the supply roll 8 being able to be determined at any time through the opening 17.

2 to 5 show the drive connection between the pivot pin 8 for the supply spool 23 and the pivot pin 9 for the take-up spool 24. The teeth 18, 19 of the pivot pins 8, 9 are designed so that they serve as a slip clutch at the same time. For this purpose, the teeth 20, 21 are shaped in a special way, as best shown in FIG. 4. The teeth 20 of the toothing 18 and 21 of the toothing 19 are in the plane in the overlap region beveled perpendicular to the tooth flanks, each with the same pitch, in such a way that their beveled surfaces 26, 27 come into contact in the direction of rotation (arrow 25 in FIG. 2), the teeth 20 with their respective teeth in the event of a speed difference between the two toothings sloping surface 26 slide over the inclined surfaces 27 of the teeth 21.

This sliding is made possible by a flexible configuration of the teeth 20 of the toothing 18. For this purpose, the teeth 20, which are preferably made of plastic, are designed in the form of lamellae in the region of their tooth neck 28 between the ring gear 29 and the tooth flanks 30 (FIG. 3), the material recess being 31 is designated. By means of these lamellar tooth necks 28 it is possible that the teeth 20 can slide along their inclined surfaces 26 on the inclined surfaces 27 of the teeth 21, i.e. it is provided in a particularly simple manner without additional elements, a slip clutch that is integrated directly into the toothing.

As can be seen in particular from FIGS. 2 and 5, a particularly simple backstop is also realized with this special configuration of the teeth 20 of the toothing 18:

For this purpose, in the area below the beveled teeth 20, a correspondingly beveled housing element 32 with an inclined surface 33 is formed, which is part of the lower housing half 3a. In the direction of rotation, the teeth 20 of the toothing 18 with their inclined surfaces 26 can slide over the inclined surface 33 of the housing element 32 due to their spring properties. In contrast, rotation of the teeth 20 in the opposite direction is blocked by the housing element 32.

As can be seen from Fig. 1, by the support of the pivot pin 8 on the annular support 10 of the bearing pin 6 a corresponding axial assignment of the two teeth 18 and 19 to each other is ensured, so that the inclined surfaces 26 and 27 of the teeth 20 and 21 accordingly in Come in contact, ie on the one hand fulfill the drive function between the two pivot pins 8 and 9 and on the other hand fulfill the slip clutch function.

Of course, the invention is not limited to the embodiment shown in the drawing. Further refinements of the invention are possible without leaving the basic idea. In particular, the housing can be designed differently with regard to the shape and design of the application element. In addition, the coils 23 and 24 can also be arranged in a cassette u. Like. more.

Claims (4)

1.Handheld device for transferring a film from a carrier film to a substrate with a housing, in which a supply spool and a take-up spool for the carrier film, each of which is attached to a pivot pin mounted in the housing, with at least one spool being assigned a backstop, the two Pivot pins are coupled to one another via a toothing with a slip clutch which is effective in the direction of rotation and the carrier film which can be unwound from the supply reel is guided via an application element which projects out of the housing and is intended for pressing the carrier film with its film side onto the substrate and from there back into the housing onto the take-up reel is
characterized,
that the toothing (18, 19) is integrated in the pivot pin (8, 9) and the slip clutch is formed as part of the toothing (18, 19). 2. Handheld device according to claim 1,
characterized,
that the teeth (20) of the pivot pin (8) for the supply spool (23) with lamellar tooth necks (28) in the region between the ring gear (29) and the tooth flanks (30) are formed, and that the teeth (20, 21) of both Pivot pin (8,9) in the area of the tooth flanks in the plane perpendicular to these are chamfered (26, 27) in such a way that the teeth (20) of the pivot pin (8) for the supply reel (23) can slide over the teeth (21) of the pivot pin (9) for the take-up reel (24) at a speed difference . 3. Handheld device according to claim 1 or 2,
characterized,
that the backstop (32) of the teeth (18) of the pivot pin (8) for the supply spool (23) is assigned. 4. Handheld device according to claim 2 or 3,
characterized,
that the backstop in the area below the beveled teeth (20) is designed as a correspondingly beveled housing element (32), such that the teeth (20) of the pivot pin (8) can only be slid over the housing element (32) in the direction of rotation.

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