EP0879202B1 - Hand-operated instrument for transferring a film from a support sheet to a substrate - Google Patents

Abstract

PCT No. PCT/EP97/00352 Sec. 371 Date Feb. 24, 1999 Sec. 102(e) Date Feb. 24, 1999 PCT Filed Jan. 27, 1997 PCT Pub. No. WO97/29036 PCT Pub. Date Aug. 14, 1997A hand-held device for transferring a film from a carrier tape to a substrate includes an applicator with an end projecting from a housing around which the carrier tape coming from a supply roll is guided to a take-up spool and on which contact surfaces are provided for the "pull" and "push" operating modes of the device, the carrier tape being pressed against the substrate by the contact surfaces for the purpose of transferring the film. The applicator contains two application toes which are separated from one another by an empty space and each of which carries one of the two contact surfaces.

Description

The invention relates to a handheld device for transferring a film from a Carrier film on a substrate, with an application device that one from a Has housing projecting end portion around which the of a supply spool incoming film-coated carrier film to a take-up spool and on one for each pulling and pushing operation of the device is provided, via which the carrier film for transferring the film to the Substrate is pressed.

Such a device is described in DE-A-38 32 163. There is the Application device from an application foot, which at its free end with a thin-lipped applicator bar is provided to a flutter-free across To ensure the film is torn along the longitudinal direction of the carrier film, such as when transferring a cover film from the carrier film on the substrate is desired. As films are predominant Adhesive films or cover films (cover-up films) are used.

The thin-lipped applicator bar contains the contact surface and adjusts uniform pressing of the film-coated carrier film even with one compliant and / or uneven substrate, such as a work surface, against the Workspace safe. This version is especially for a pulling order of the film designed on the work surface.

Another handheld device for transferring a film from DE-A-4220712 shows a carrier film on a substrate.

Recently, handsets have become known in practice, both for one pulling, as well as for a pushing order of the film on the Worktop are set up. The push operation of such handheld devices offers the advantage that e.g. with filigree masking work, such as text corrections, beginning and the end of the correction path can be viewed clearly and not at the same time are covered by the handheld device, as is the case with the pulling transfer is.

Such a known, corresponding to the preamble of claim 1 Handheld device has a housing from which a support foot with an application roller protrudes its free end area as an application device. That from the The supply spool of film-coated carrier tape is used to transfer the Film on the substrate to the application roll, where it depends on the attitude of the Handheld device, i.e. depending on the intended operation of the handheld device in pulling or pushing way, over a first contact surface or second contact surface can be pressed against the substrate. After this Transfer of the film or film layer to the substrate becomes the blank tape Take up spool.

Should both applications, i.e. the train and push operation, optionally used, this sets one essentially symmetrical trained application facility ahead, because the handheld device to change the Operation by rotating 180 ° with the other Contact surface placed on the work surface formed by the substrate must become. Since the carrier film when unwinding from the supply reel the latter including its coil core and its pivot bearing, also one Slipping clutch and the take-up spool for the inclusion of the blank tape together whose coil core and its rotary bearing must drive Torques that are overcome by the adhesion of the film to the substrate otherwise the film would tear off and / or the Carrier film transport would come to a standstill.

An order roll is for the optional pull or push operation of the Handheld device is well suited, but it does not guarantee flutter-free tear-off of the film running at right angles to the longitudinal direction of the carrier film, such as it is desired when transferring a cover film to a substrate sheet and can be realized by using an application bar as an application device.

Tests with application strips have shown that, depending on the adhesive property, one Films for its use a minimum contact area by the Width of the carrier film and the contact length of the carrier film on the substrate between the film and the substrate must not be undercut. Furthermore, a user should not have a fixed angle of attack of the handheld device should be restricted in its operation, but a safe function should be also for an individually selected angle of attack in a certain Angular range can be guaranteed, which can be achieved in that the Contact area, i.e. the respective contact surface is preferably rounded.

The handheld devices that have become known in practice for alternative pushers or pull transfer of the film from the carrier tape to the substrate therefore an applicator fillet radius of 0.4 to 0.6 mm on what inevitably leads to a thickness of the application strips, which is an elastic Excludes adaptation to the substrate. But there is the radius of the rounding can not be made arbitrarily small, the advantages of one Handheld device according to DE 38 32 163 A1 used application bar, such as for example, the elastic conformity to non-planar substrate and exact demolition of the film layer, in total with one for pulling and pushing application designed handheld device neither with a known Order bar, can still be reached with an order role.

Proceeding from this, the aim of the invention is the generic handheld device to improve so that there is always a pull and push operation even, uninterrupted transfer of the film from the carrier film to ensures the substrate with exact film tear at the end of the application.

According to the invention this is done by a handheld device of the type mentioned thereby achieved that the application device two through a free space spaced apart application bars, each one of the two Wear contact areas.

The use of two application bars on the one hand provides an exact, on the other Carrier tape run approximately right-angled tearing of the film at the end of a desired film transmission path safely, but also allows a sufficiently large common rounding or envelope radius for the end areas of both application strips, the arc of which the free space spanned so that both a pulling and a pushing application is easily possible. On the other hand, with the invention Embodiment, the application strips are also so thin that they due to its flexibility, even pressing of the film ensure compliant or uneven substrate by using local Compensate for unevenness.

Another advantage of the invention is that in both modes each use a task bar optimally designed for the problem can come.

According to an advantageous development of the invention it is provided that the Application strips are elastically deformable against each other. This will make one further improve the operation of the handheld device and a larger one Convenience achieved when using it because of the possibility of customization the contact areas on the substrate is further improved, so that a correct and even support of the carrier tape and thus the transmitted film ensured even on an uneven substrate at all times is. This is ensured without the handheld device having a large Force must be pressed against the substrate. The user can thereby focus on guiding and holding the handheld device, resulting in a contributes to error-free application

A particularly inexpensive version of the handheld device according to the invention can be realized in that the application device has an application foot contains the two at one end of the free space forms or runs into separate application strips, e.g. in the form of a slotted foot at the end. Therefore need it in the case of the known hand-held devices, only the application devices against those with the above configuration can be replaced without further changes to the handheld device or its individual components would be required. So a slotted application foot can at least in have essentially the same dimensions and shapes as those previously used unslit feet. It also requires the production of a slotted one Order foot no additional manufacturing effort and leads as further advantage even to material savings. The order foot with the Both application strips can be made in one piece or in several parts. On In this embodiment, the device according to the invention can thus be up to the slot in Match foot with a known handheld device, the Design according to the invention ensures that a function in the state order footing equivalent to technology and in both operating modes Advantages of an elastic adaptation to the substrate and an exact Demolition of the film offers. The rounding radius of the well-known application foot corresponds to a corresponding embodiment of the invention Envelope circle radius by the at least essentially continuous continuation an end curve or rounding of the two unloaded application strips is obtained across the slot.

Another advantageous alternative to a slotted application foot is in that the application device contains two separate order feet, which on their form an application bar in each of the free end areas. This execution allows additional freedom in design and arrangement as well as in the material selection for the order feet, so that a further adjustment to the specific requirements of each of the two operating modes is possible.

For the compactness and easy handling of the hand-held device according to the invention it is also advantageous and therefore preferred if the or at least an order foot to adjust the distance of his order bar (s) from Housing is adjustable. This can be achieved in a simple manner that the handheld device individually to the needs of the user and / or to the Operating mode for pulling or pushing the handheld device can be adapted can. The adjustment options can include both the angle of attack Application bar (s) and thus the contact area (s) as well as the removal of the Grip the application bar (s) from the housing.

For example, this version can be shared by two Center plane, which runs parallel to the free space (separation slot), symmetrically arranged order feet can be realized to their order bars the Carrier tape is routed outside the housing. So for everyone Operating mode, i.e. for pulling or pushing the handheld device, one each job bar optimally designed for the specific problem.

The adjustment option for the version with two application feet is special advantageous if this for the opposite adjustment of the distances of their Application bars can be adjusted coupled together from the housing. So that can each for the currently intended operation of the handheld device, i.e. Train or Thrust, intended application foot by extending or folding into the optimal one Operating position and the other foot e.g. withdrawn or be folded away so that the latter neither the film transmission, nor possibly the obstructed view of the job or transfer point. Through the Coupling the two adjustment movements is only a single operation necessary to switch the handheld device between the two operating modes.

It is the coupled opposite adjustment of two order feet further particularly advantageous if the coupling for the same size in opposite directions Adjustment paths on both application bars preferably as a synchronous adjustment is designed. The same adjustment distance for both feet ensures that the Carrier tape guided over them reliably in each of the two settings the application strips or their contact surfaces, because the total length of the Path of the carrier tape from the supply reel to the take-up reel because of the synchronous adjustment is constant, so that the carrier tape is not loose is and can slip off the application bars.

Two substantially parallel, stationary with respect to the housing, i.e. Not adjustable and in particular equally long application feet can be dependent from their location cause in one mode or even both modes the view of a current job through the one selected in the Operating mode inactive foot is impaired. By appropriate combination The embodiment variants described above can be an embodiment, for example be created in which the feet can be moved parallel to each other are that the view of the current job is always well preserved.

In the hand-held device according to the invention, the order feet or Application bars preferably provided a switching device, the simplest Case can be operated manually. In principle, however, an automatic system can also be used be included, for example, depending on the position of the handheld device makes certain settings automatically. Backing up the settings, the manual changeover, for example, by locking or Locking can be effected in the case of an automatic e.g. by cause the wedges to slip depending on the device position.

A manual actuation of the switching device can, for example, by a rotary or swivel switch or a slide can be effected. To the To be able to recognize the selected setting easily, you can use the corresponding Positions of the switch or slide suitable information, e.g. a pointer, which makes it easier to assign the position to the respective note be, the switch or slide itself also be designed pointer-like can.

The changeover device for adjusting preferably contains each adjustable one Order foot, however, a link lever, which is a guide for a assigned form foot attached form projection with which he in Sliding intervention is in place. This allows a rotary and / or sliding movement, e.g. on a handle or a switch on the outside of the device, in an adjustment movement for the order foot or the order feet be implemented, with the exact sequence of movements and the time course this movement is predetermined by the design of the scenery guide.

Are the two link levers in opposite directions for two adjustable order feet have the same effect, and in particular they have the same effects as according to one further preferred embodiment of the invention is provided, it remains Carrier belt in any case in the end position of both operating modes and in particular also during the adjustment movement of the application foot or the application feet always taut.

The housing for the pulling and pushing is also preferred Operation of the hand-held device at least essentially symmetrical, which makes it advantageous in each of the two modes of operation alike can be held and guided easily and safely.

In the invention it is possible to use the free end area of the application device to design that the end faces of the two applicator bars with the one in between lying free space on a common envelope radius, preferably of 0.4 up to 0.6 mm. This preferred dimensioning allows empirically determined optimal dimensions of the hand-held device according to the invention with regard to a pull and push operation, so that a good Unwinding the carrier film and a reliable transfer of the film to the Substrate is ensured in each of the two modes of operation. The envelope radius corresponds to the rounding radius, which corresponds to the level of an order foot The technology must be dimensioned so that it has a sufficient contact area Carrier film or the film on the substrate with individually selectable angles of attack of the handheld device during operation.

It is also advantageous if the contact surface on the one application bar specific to one pulling operation and the contact area at the other Application bar specifically designed for pushing operation of the handheld device is to optimize its operation and use.

Figur 1

eine seitliche Prinzip-Detaildarstellung einer Auftrageinrichtung gemäß einer ersten Ausführungsform des erfindungsgemäßen Handgerätes im Längsschnitt;

Figur 2

eine seitliche Prinzip-Detaildarstellung einer Auftrageinrichtung gemäß einer zweiten Ausführungsform des erfindungsgemäßen Handgerätes im Längsschnitt und

Figur 3

eine erweiterte seitliche Prinzip-Detailddarstellung der Ausführungsform nach Fig. 2 im Längsschnitt.

The invention is explained in more detail below by way of example with reference to the drawing. Show it:

Figure 1

a side principle detail view of an application device according to a first embodiment of the handheld device according to the invention in longitudinal section;

Figure 2

a lateral principle detail representation of an application device according to a second embodiment of the handheld device according to the invention in longitudinal section and

Figure 3

an extended lateral principle detail of the embodiment of FIG. 2 in longitudinal section.

The same parts with the same reference numerals are used in all the figures provided so that the items of the handheld device and their functions for the Expert can also be clearly seen from the drawing when in the description does not relate to any figure on any part and every function is entered.

Figure 1 shows an application device 1 of an otherwise not shown Handheld device with an application foot 3, at the front area 11 two through a free space 18 in the form of a slot 17 separate application strips 4a, 4b are integrally formed. For transferring a film 7 from a carrier film 6 The application device 1 projects from a housing 2 onto a substrate 8 (cf. FIG 3) with its end region 11. From a supply spool (not shown) Coming carrier film 6 runs over the application device 1, is deflected there and in its subsequent area 10 to a (not shown) Winding spool guided in the housing. For pulling and pushing operations of the hand-held device is in the front free end area of both application strips 4a, 4b A contact surface 9a or 9b is provided, via which the carrier film 6 for Transfer the film 7 can be pressed against the substrate 8.

The free ends of the two application strips 4a, 4b are towards one another in FIG. 1 rounded, i.e. their fillets lie on a common envelope with a radius R, which has a size in the range of 0.4 to 0.6 mm.

It is advantageous if the slot 17 is made fairly narrow so that when Pressing the application foot 3 against the substrate 8 does not cause such a strong deformation or narrowing of the application foot 3 occur in its end region 11 can that the carrier film 6 is no longer sufficient on the application bars 4a, 4b is guided and can slide off the side of the application foot 3.

The fillets 16 permit a position which can be adapted to an angle of attack α of the contact surfaces 9a, 9b, which is due to the flexibility and elasticity of the application strips 4a, 4b is promoted. This means that the handheld device can always be used in one each user comfortable posture and at the same time a flawless Transmission of film 7 can be achieved.

However, the two application strips 4a, 4b do not only give on their thin-lipped lips free end, i.e. in the area of the roundings, elastically after pressure, but are overall elastic in the area of the slot 17 against each other deformable. This will e.g. compensation also varies depending on the user strong contact pressures, with the respective inactive application bar 4b, 4a as a path limitation for those bent by the application pressure other application bar 4a or 4b is used. Possibly. can also be a separate stop (Not shown) intended for feet in another embodiment of the invention become.

The hand-held device is at least essentially symmetrical with one trained housing 2 provided that this both when pulling, as well in pushing operation is about the same in the hand of the user. Around Switching between the two operating modes can be done e.g. from the right hand a user pulling handheld device while maintaining his spatial position and orientation are passed into the left hand, after which it is turned counterclockwise until it is aligned so that now with the left hand a pushing operation for film transmission can be carried out, in which then no longer the contact surface 4a, but the contact surface 4b for pressing the carrier film 6 against the substrate 8 is used. For this purpose, the application foot 3, like the housing 2, is also essentially symmetrical.

Due to the rounding 16, the handheld device is so in the area of the contact surfaces shaped that the one application bar 4a to a pulling operation and the another application bar 4b is particularly adapted to a pushing operation. The use of the application bars 4a and 4b enables, unlike when used an application roll, an exact one that runs transversely to the carrier film transport Demolition of film 7 at the end of the film transfer line. The Application strips 4a, 4b are so thin that they are not on one plan substrate 8 always ensure an even application.

In Figures 2 and 3 are details of another embodiment for a Application device 1 shown.

FIG. 2 shows the front area 11 of an application device 1 with two Order feet 3a and 3b, which by a space 18, for example as Gap 17 is formed, are separated in the transport direction of the carrier film 6. Each of the two application feet 3a, 3b ends in an application bar 4a or 4b. On the contact strips 4a, 4b are in turn provided with contact surfaces 9a and 9b, by means of which the carrier film 6 is pressed against the substrate 8 for film delivery can be. The application bars 4a, 4b are flexible to the extent that they Can compensate for unevenness on the substrate 8. The order bars are for this 4a, 4b formed thin-lipped, which according to the representation in Figures 2 and 3 by tapering the longitudinal cross section of the Application strips 4a, 4b is realized in the direction of the carrier tape, namely so that the free space 18 towards the end of the application strips 4a, 4b in this Direction gets bigger. However, this configuration is only exemplary consider, because the required flexibility of the application bars by others shaping measures or other material selection and combinations realized can be. In particular, the design of the order feet 3a, 3b in one piece with the application bars 4a and 4b also by a different one one-piece connection to be replaced.

The two application bars 4a, 4b each form part of an application foot 3a or 3b and are elastically deformable against each other. This will make a additional movement or compensation path created, the different strength Can apply contact pressures against the substrate 8, so that accordingly equipped handheld device by different powerful users always with optimal Function can be used.

The two application feet 3a, 3b are symmetrical to the central axis M-M of the gap 17 arranged, one for each mode, i.e. Train or Push operation, wear application bar 4a, 4b optimally designed for the problem.

The quasi-modular composition of the application device 1 from two separate order feet 3a, 3b offers even more adjustment options than with only one application foot (Fig. 1) and additional adjustment options, as shown below.

In contrast to the exemplary embodiment according to FIG. 1, the application feet 3a, 3b 2 and 3 in the end areas of their application strips 4a and 4b none Fillets on for different angles of attack α of the handheld device are designed. Here the application strips 4a, 4b are rather so at their ends thinly formed so that it is below that in use anyway can easily bend existing pressure against the substrate 8 accordingly, so that also a wide range of angles of attack α of the hand-held device relative to the substrate 8 is possible. Depending on the specific design, the Application strips 4a, 4b the contact surface 9a or 9b used in each case even one have a larger area than in the case of FIG. 1, in which the fillets 16 are provided that almost only one contact line across to the hard surface Form carrier tape transport, but what the proper functioning of the Handheld device is generally sufficient.

Due to the above-mentioned deformation of the application strips 4a, 4b each time they are pressed of the device against the substrate 8 is also rounded trained, but need not be as uniform as the fillets 16 in Figure 1.

FIG. 3 shows an embodiment for the overall arrangement in which the Order feet 3a, 3b with respect to the distance of the end of their respective order bar 4a and 4b are adjustable from the housing 2. The adjustment of the distances the application strips 4a, 4b from the housing 2 are coupled and coupled here opposite. So e.g. the distance of an application bar 4a to the housing increases, so it decreases automatically and preferably also synchronously the distance of the other application bar 4b from the housing 2.

This means that two operating positions can be set, each one for the pulling operation or for pushing operation, whereby always the view of job A, which can be a correction post, for example can be released. In each of these two operating positions, one of the Application feet 3a, 3b further out of the housing 2 than the other application foot 3b and 3a.

A comparison of the representations of Figures 2 and 3 illustrates this effect. In Figure 2 is indicated by an arrow 20 the viewing direction of the user. It it can be seen that the order bar 4b lying above the order bar 4a View of work area A covered. In order to be able to see job A, the user would, based on the representation in Figure 2, obliquely from the left look under the application bar 4b. Appropriate head posture is tiring and would impair the user's ability to concentrate. Moreover there are none at work area A covered by application bar 4b optimal lighting conditions, which overall makes handling difficult.

In contrast, the setting option of the application bars shown in FIG. 3 enables 4a, 4b both an unobstructed view as well as an optimal one Incident light on work area A. The application foot 3b with the application bar 4b is in the position shown a piece into the housing 2, so that the Application bar 4a and in particular its free end edge through the application foot 3b is no longer covered and the viewing direction indicated by the arrow 20 up to the boundary line substrate 8 / application bar 4a is not blocked.

While it is not mandatory, the exposure of the Work area supported by the user's gaze that at the same time for pushing in the application bar 4b with respect to the housing 2 with respect the latter, the application bar 4a is pushed out. The two strips 4a, 4b and thus of course the two application feet 3a and 3b become parallel shifted to each other. This control of the application feet 3a, 3b enables that only relatively short adjustment paths have to be accomplished in order to Operating mode to get a view of work area A. In the housing 2 must therefore no large space for receiving a retracted application foot 3a or 3b are kept ready. However, there is a clear view of the job A can also be achieved if only one foot 3a or 3b compared to the other Application foot 3b or 3a into and out of the housing 2 adjustable would. The housing 2 would then have a somewhat larger adjustment path, however ready for the adjustable order foot.

Instead of a parallel shift of the two application feet 3a, 3b relative a corresponding adjustment to one another could also be achieved by pivoting of the / an application foot 3, 3a or 3b or both application feet 3a, 3b reached become. Adjustment options of both order feet 3a, 3b can, as well basically their displacement, either coupled to each other or from each other be carried out separately. Also a combination of postponement and pivoting would be possible as desired, only care being taken that especially in the pushing mode, which is specifically for precise positioning and guiding the handheld device 1 is suitable, as freely as possible The user's view of job A should be possible.

In the arrangement shown in FIG. 3, there is a switching device 21 provided, each for adjusting each application foot 3a, 3b Link lever 22a, 22b contains. The two link levers 22a, 22b are integral connected to a switch 23 and pivotally mounted on an axis 24, which lies in the middle between the two link levers 22a, 22b, which in turn perpendicular to the lever 23 of the switch.

The two link levers 22a, 22b aligned in mirror image to one another are otherwise identical. With this configuration, they act when twisted of the switch 23 in opposite directions about the axis 24 and with the same effect, i.e. by actuating the switch 23, the same adjustment distances of the two Application feet 3a, 3b, but in opposite directions. Switching the switch 23 thus simultaneously, automatically and synchronously pulling in an application foot 3a or 3b and pushing it out the other order foot 3b or 3a by the same distance. Thereby the carrier tape or carrier film 6 remains both during the switching process, as well as in the two end positions, the two operating modes correspond, always taut.

Each link lever 22a, 22b contains a link groove 25a or 25b, which in its longitudinal direction. There is a cam on each of the application feet 3a, 3b 26a and 26b formed, which in the associated link groove 25a, 25b from the Side engages. Since the switch 23 is a rotary switch, rotary movements of the switch 23 in displacement movements of the application feet 3a, 3b implemented. By flipping switch 23, the two link levers 22a, 22b pivoted in opposite directions about the common axis 24 and pull the corresponding cam 26a or 26b in each case via their link groove 25a, 25b with, which in turn is the oppositely equidistant parallel adjustment of the order feet 3a, 3b causes.

The switch 23 is designed like a pointer and in each of its end positions aligned to an arrow representation on the housing, which on an indication on the housing surface regarding the then indicates the set operating state. As operating status information are here for "pull" the word PULL and for "push" the word PUSH like the arrow representations are also molded into the housing surface. This can a user can easily get clarity before using the handheld device procure which mode of operation is currently set without danger run, with a hand-held device 1 set to overrun operation want to perform.

In the figures, the contact surfaces 9a, 9b are each shown identically designed. However, this does not necessarily have to be the case. It can also be provided, for example be the contact surface 9a or 9b of the one application bar 4a or 4b a pulling operation and the contact surface 9b or 9a of the other application bar 4a or 4b adapted to a pushing operation of the handheld device to train.

Claims (12)

1. A hand-held device for transferring a film (7) from a carrier tape (6) to a substrate (8) comprising an applicator (1) with an end (11) projecting from a housing (2) around which the carrier tape (6) coming from a supply roll is guided to a take-up spool and on which contact surfaces (9a,9b) are provided for the pull and push operating modes of the device (1), the carrier tape (6) being designed to be pressed against the substrate (8) by said contact surfaces for the purpose of transferring the film (7), characterized in that the applicator (1) contains two vertically adjacent application toes (4a,4b) which are separated from one another by an empty space (18) and each of which carries one of the two contact surfaces (9a,9b).
2. A hand-held device as claimed in claim 1, characterized in that the application toes (4a,4b) are elastically deformable relative to one another.
3. A hand-held device as claimed in claim 1 or 2, characterized in that the applicator (1) contains an application foot (3) which, at its free end (11), terminates in the two application toes (4a,4b).
4. A hand-held device as claimed in claim 1 or 2, characterized in that the applicator (1) comprises two separate application feet (3a,3b) at the free ends (11) of which application toes (4a,4b) are formed.
5. A hand-held device as claimed in claim 3 or 4, characterized in that the relative position of the ends of the application toes (4a,4b) of the - or of one - application foot (3; 3a,3b) from the housing (2) is adjustable.
6. A hand-held device as claimed in claim 4 comprising two application feet, characterized in that the two application feet (3a,3b) are coupled to one another for adjustment to enable the distances of their application toes (4a,4b) from the housing (2) to be oppositely adjusted.
7. A hand-held device as claimed in claim 6, characterized in that the coupling is designed for opposite but equal adjustment distances.
8. A hand-held device as claimed in any of claims 5 to 7, characterized in that a preferably rotatable reversing mechanism (21) is provided for adjusting the application feet (3a,3b) or rather the application foot.
9. A hand-held device as claimed in claim 8, characterized in that, for adjusting each application foot (3; 3a,3b), the reversing mechanism (21) comprises a crank lever (22a;22b) which engages with a shaped projection (26a,26b) arranged on the associated application foot (3; 3a,3b).
10. A hand-held device as claimed in claim 9, characterized in that the reversing mechanism (21) comprises two crank levers (22a,22b) operating equally in opposite directions.
11. A hand-held device as claimed in any of the preceding claims, characterized in that the ends of the two application toes (4a,4b) with the empty space (18) in between lie on a common envelope circle with a radius of 0.4 to 0.6 mm.
12. A hand-held device as claimed in any of the preceding claims, characterized in that the contact surface (9a or 9b) of one application toe (4a or 4b) is designed specifically for the Apull≅ operating mode while the contact surface (9b or 9a) of the other application toe (4b or 4a) is specifically designed for the Apush≅ operating mode of the hand-held device.

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