EP1105331B1 - Device for transferring a material in the form of a film that is applied to a carrier strip onto a substrate - Google Patents

Abstract

A device for transferring a film from a carrier strip onto a substrate includes a housing having a supply reel and an empty reel. A film coated carrier strip is guided over an applicator foot where a clip-type slide element is provided in the region around which the carrier strip is looped. The clip-type slide element is made of a friction-reducing material secured to the applicator foot. The slide element has an elliptical cross-sectional shape so that on transfer of the film onto the substrate the contact pressure region of the slide element bears over an area adjacent to the substrate with interposition of the carrier strip.

Description

The invention relates to a device for transmitting a Form of a film on a carrier tape on a substrate, such as a writing or drawing sheet, with a housing in which a supply spool for the film-coated Carrier tape and an empty spool to hold the stripped carrier tape are arranged, the film-coated carrier tape passed over an application foot which is at least in the loop wrapped by the carrier tape Area with a clip-like sliding element from one friction-reducing material is provided, which on Order foot is attached.

Handheld devices of this type for transferring a film (for example adhesive, masking compound, marking dye, etc.) are known. In order to strive for smooth movement and good transferability of the film to the substrate, different designs for the configurations of the application foot are known. For example, the application foot can be equipped with an application roller, which preferably has a rubber-elastic tread. However, since the outer diameter of a f u nktionsgerechten application roller can not be kept as small as desired, because a good clinging to the substrate requires a minimum thickness for the elastic running ring and the rotational mobility requires a sufficient difference between the stub shaft and external diameter, having such a coating roll disadvantages. Therefore, in most solutions, the application foot usually has an application bar, which has advantages over an application roll, since a sharper angling of the carrier tape is possible in the transfer phase, as a result of which the tear-off after the transfer has been carried out has less tendency to form a flutter edge. On the other hand, it is disadvantageous compared to a solution with an application roll that, in the application bar, the carrier tape is guided over it by friction, which, depending on the quality of the carrier tape, can lead to undesired stiffness.

Basically, plastics are known that have good sliding behavior have, such as polytetrafluoroethylene (PTFE), which is however many times higher in price lies than that usually for the components of a generic Standard materials used in the device. For cost reasons therefore the use of an order foot is excluded made of polytetrafluoroethylene.

Since polytetrafluoroethylene is not a real thermoplastic, it must also exclude the sliding active area of the Application foot in the multi-component or back injection process with this high quality material. A conceivable solution, such as masking the application bar with a self-adhesive fluoroplastic-coated film has already been examined, but from unsuitable for a mass-produced article.

EP-A-427 870 describes a device for transferring a film a carrier tape applied substance known to a substrate that a Has supply spool and empty spool, the application foot with a sliding element is provided and the pressing area of the sliding element lies flat against the substrate. The sliding element or the application foot is complete in the area of the printing surface consistently made of one material.

A generic device is known from US-A-5,430,904. With this device is the application foot in the area wrapped by the carrier tape with a sliding element made of a friction-reducing rubber-like material, which on the application foot is attached. This sliding element is intended to transfer the film to the Improve substrate. It points in the active pressure segment of the order bar a rotationally symmetrical curve and therefore a small one line-shaped contact area with the substrate. It has been found that when transferring the adhesive layer to a substrate, the adhesive layer easily tears so that the carrier tape slides on its silicone layer over the substrate and the drive is interrupted.

The object of the invention is therefore to improve a generic device so that with the least possible effort a perfect transfer of the film the substrate is guaranteed.

This task is carried out in a device of the type described at the outset solved according to the invention in that the sliding element has an elliptical cross-sectional shape, such that when Transfer the film to the substrate's pressure area the sliding element with the intermediate arrangement of the carrier tape lies flat against the substrate.

According to the invention, it is possible in a surprisingly simple way by simply changing the cross-sectional shape of the Sliding element a much larger contact area between the sliding element on the one hand and the substrate on the other to create a sufficient contact area for To provide that ensures that the adhesive layer does not tear off, so that the proper function of the Device is given. The sliding element itself can with this Training can be extremely small, for example as a semi-finished product of the smallest dimensions (for example with an outer diameter of 1 - 1.2 mm and 0.2 to 0.3 mm wall thickness) can be made by placing it on the desired one Cut off length, slit lengthways and then spread out and pushed onto the application foot becomes. This can also be done automatically in a simple manner.

It is particularly advantageous that the sliding element Made of polytetrafluoroethylene (PTFE) because of this material has a particularly good sliding behavior. Of course you can materials with comparable properties are also used become.

It is also advantageously provided that the sliding element receiving end portion of the application foot also an at least partially elliptical cross-sectional shape having. The sliding element can then be manufactured in a particularly simple manner because the inner contour of the same is the outer contour can largely correspond. It is then also safe held on the application foot.

Fig. 1

in isometrischer Darstellung einen Auftragsfuß eines Gerätes nach dem Stand der Technik ohne Gleitelement,

Fig. 2

in Seitenansicht teilweise im Schnitt den Auftragsfuß eines erfindungsgemäßen Gerätes ohne Gleitelement,

Fig. 2a

im Schnitt das Gleitelement für das Gerät nach Fig. 2,

Fig. 3

die Vorderansicht des Auftragsfußes,

Fig. 4

in Seitenansicht teilweise im Schnitt den Auftragsfuß nach Fig. 2 mit eingeschwenktem Auslegerarm und aufgesetztem Gleitelement,

Fig. 5

eine Vorderansicht der Fig. 4 und

Fig. 6

in isometrischer Darstellung den Auftragsfuß.

The invention is explained below with reference to the drawings, for example. These show in:

Fig. 1

an isometric representation of an application foot of a device according to the prior art without a sliding element,

Fig. 2

in side view, partly in section, the application foot of a device according to the invention without a sliding element,

Fig. 2a

in section the sliding element for the device according to FIG. 2,

Fig. 3

the front view of the application foot,

Fig. 4

in side view, partly in section, the application foot according to FIG. 2 with the extension arm pivoted in and the sliding element attached,

Fig. 5

a front view of FIGS. 4 and

Fig. 6

the job foot in isometric representation.

In Figure 1 is a conventional device for transmitting a in the form of a film applied to a carrier tape on a substrate according to the prior art without a sliding element shown, but only with those for the invention significant parts, namely one generally designated 1 Applicator. This order foot 1 is with a Order bar 2 equipped around which a coated carrier tape 3, that of a supply spool, not shown the device comes to the order bar 2 is guided. To the transfer of layer 4 to a substrate it is called Blank tape 5 forwarded to a winding spool, not shown. With regard to the smooth operation of the device and a flawless transfer of the film to the Substrate has been found to be such an application foot 1 is unsatisfactory.

Another embodiment of the invention is therefore according to the invention Order foot provided, this is shown in Figures 2 ff.

An inventive foot of an inventive Device is generally designated 6 in the figures. This Order foot 6 has band guide ears 7, between which the carrier tape is guided. The order foot 6 is with a cantilever arm 9 which is pivotable via a film hinge 8 is articulated on the application foot 6. This cantilever arm 9 is at the end as a receiving profile (end section 10) for a clip-like sliding element 15 is formed. On the order foot 6 grooves 13 are recessed, which are used in pivoted Position of the cantilever arm 9 a latching engagement to reach the cantilever arm 9 on the order foot 6, which is why Cantilever arm 9 locking cams 12 are provided on both sides.

As can be seen from FIG. 3, the cantilever arm 9 preferably has longitudinal ribs 11. These ribs 11 serve in connection with the choice of an elastic material, e.g. Polyolefin, for particularly good contact security between the order bar (end section 10) and possible Unevenness in the substrate level. Because the clip-like sliding element 15 made of polytetrafluoroethylene also elastic is achieved in that even with an uneven substrate the entire transfer width of the belt is pressurized and, like an elastic roller, blistering is reliably prevented, so that a smooth coating done on the substrate.

Essential to the invention, the sliding element 15 has how special 2a and 4, an elliptical Cross-sectional shape, such that when the Film on the substrate of the pressing portion 15a of the sliding member 15 flat with the intermediate arrangement of the carrier tape rests on the substrate. It is also provided that the End portion 10 of the application foot receiving the sliding element 15 6 or the cantilever arm 9 also at least one partially elliptical cross-sectional shape, this The area is indicated in FIG. 2 by the reference number 10a.

Figures 4 and 5 show the extension arm 9 in the pivoted and locked location. Here is the film hinge 8 pivoted about 90 °. That on the end portion 10 of the Cantilever arm 9 is a clip-like sliding element 15 additionally fastened in that stop stages 16 and 17 are provided on the application foot 6 or on the cantilever arm 9, whereby the sliding element 15 is secured against rotation. By placing the cantilever arm 9 on a traverse 18 of the application foot 6 is achieved that the free end portion 10 of the boom 9 in its entirety compliant can rebound.

From Figure 5, the application foot 6 is in front view with in the grooves 13 latched locking cams 12 and accordingly attached sliding element 15 to recognize. Through stops 19 is achieved on the order foot 6 that, if possible, too strong contact pressure if the device is handled improperly the last job bar formed by the sliding element 15 Receives end stop, which is dimensioned so that the Sliding element 15 still a few tenths of a millimeter above the contour of the tape guide ears 7 protrudes so that the transfer function always remains secure. It can also be seen that advantageously the ends 20 of the clip-like sliding element 15 recessed in recesses 21 of the band guide ears 7 are, which ensures that the carrier tape of the by cutting to length the hose from which the sliding element 15 is preferably manufactured, possibly crushed Ends 20 is kept away.

In Figure 6, the entire application foot 6 is in the functional position, i.e. with pivoted and locked extension arm 9, shown again, in the end position of the clip-like Sliding element 15 with protection against rotation and Longitudinal displacement.

Of course, the invention is not limited to the illustrated embodiments limited. Other configurations are possible without leaving the basic idea. The sliding element Of course, 15 need not be an exact elliptical Have cross-sectional shape, it is essential that there is a flat pressing area 15a forms.

Claims (3)

1. Device for transferring a material (4) in the form of a film applied to a carrier strip (3) onto a substrate, such as a sheet of writing or drawing paper, comprising a housing in which a supply reel for the film-coated carrier strip (3) and an empty reel for receiving the de-coated carrier strip (5) are arranged, wherein the film-coated carrier strip (3) is guided over an applicator foot (6), wherein on transfer of the film onto the substrate the contact pressure region (15a) of a slide element (15) bears over an area against the substrate with interposition of the carrier strip, characterised in that the slide element (15) is constructed to be clip-shaped, that the slide element (15) has an elliptical cross-sectional shape and that the applicator foot is provided at least in the region which is looped around by the carrier strip (3) with the clip-type slide element (15), which is of a friction-reducing material and which is secured to the applicator foot (6).
2. Device according to claim 1, characterised in that the slide element (15) consists of polytetrafluorethylene (PTFE).
3. Device according to claim 1 or claim 2, characterised in that the end portion (10), which receives the slide element (15), of the applicator foot (6) similarly has a cross-sectional shape which is elliptical at least regionally.

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