MXPA01001749A - 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 material in the form of a film that is applied to a carrier strip onto a substrate such as a sheet of writing paper or drawing paper. The inventive device comprises a housing that accommodates a supply reel for the film-coated carrier strip and an empty reel that receives the carrier strip when the coating is removed. The film-coated carrier strip is guided via an application foot that is provided with at least one clip-type sliding element which is made of a friction-reducing material in the area around which the carrier strip is twisted and secured to said foot. The aim ofthe invention is to prove an improved device enabling the film to be transferred onto the substrate as easily as possible. This is achieved by providing the sliding element (15) with an elliptical cross-sectional shape so that when the film is transferred onto the substrate, the sliding element (15) presses against the substrate in a flat area (15) located thereon and the carrier strip is arranged in between.

Description

DEVICES FOR TRANSFERRING A MATERIAL IN THE FORM OF A FILM THAT APPLIES TO A CARRIER STRIP ON A SUBSTRATE The present invention relates to devices for transferring materials in the form of a film applied to a carrier strip on a substrate, such as a sheet of writing or drawing paper, comprising a housing in which a supply reel is arranged. for the film-coated carrier strip and an empty reel for receiving the stripped carrier strip, wherein the film-coated carrier strip is guided on an applicator leg that is provided at least in the region that is loop around which the strip carrier with a friction-type slide member of a friction reducing material is attached to the applicator leg. Manual devices of that type for transferring a film (for example adhesive strip, blinding agent, marker ink, etc.) are already known. In this case, in order to achieve uniform movement and good transfer capacity of the film on the substrate, various modalities for the shapes of the applicator leg are known. In this way, the applicator leg can be equipped, for example, with an applicator roller, which preferably has a rubber-elastic travel surface. However, since the outer diameter of a functionally effective applicator roll can not be kept as small as desired, because a good adaptation to the substrate requires a minimum thickness for the ring of elastic travel, and rotational mobility presupposes a difference Sufficient between the short section of the shaft and the external diameter, this applicator roller has disadvantages. According to this, in most solutions, the applicator leg usually has an applicator strip, which has advantages over an applicator roller, and a more acute angle of the carrier strip is possible in the transfer phase, with what the detached piece has less tendency to form a wavy edge after finishing the transfer. Against this is the disadvantage relative to the applicator roller solution that in the case of the applicator strip, the carrier strip was gouged over with a friction copy which, depending on the quality of the respective carrier strip can lead to an undesirable drag . In principle, synthetic materials having good sliding properties are known, for example polytetrafluoroethylenes (PTFE), but they have a higher cost by a multiple than the standard materials usually used for the components of a device of the type in question. Accordingly, the use of a polytetrafluoroethylene applicator leg is excluded on a cost basis. Since polytetrafluoroethylene is not a real thermoplastic, a charge of the region, which is effective with respect to the guides, of the applicator leg by this high quality material in a multi-component injection molding process or a Subsequent injection molding process. A conceivable solution, such as sticking the applicator strip to a thin self-adhesive sheet coated with flouroplastics, has in fact already been attempted, but from the point of view, production engineering is unsuitable for mass-produced articles. A device of the category in question is known from the U.S. patent. No. 5,430,904. In this device, the applicator leg is provided in the region that is looped around which the carrier strip with a sliding element, made of a friction reducing elastic-rubber material and attached to the applicator leg. This sliding element will improve the transfer of the film on the substrate. In the active pressure segment of the applicator strip it has a rotationally symmetric curved profile and as an inevitable result a small region of linear contact with the substrate. It has been shown that in the transfer of the adhesive layer onto a substrate, the adhesive layer easily tears, so that the carrier strip slides on the substrate in a silicon layer and the pulse is interrupted. Accordingly, the object of the invention is to improve a device which, according to the category, guarantees a seamless transfer of the substrate film in return for the smallest possible cost. According to the invention, this objective is met in the case of a device of the type denoted in the introduction in which the sliding element has an elliptical cross-sectional shape, such that before transfer of the film onto the substrate, the contact pressure region of the sliding element rests on an area against the substrate with interposition of the carrier strip. According to the invention, it is possible in an unexpectedly simple way to create, by simple change in the cross-sectional shape of the sliding element, a substantially larger contact area between the sliding element on the one hand and the substrate on the other hand, in order to make available a sufficient contact pressure area which ensures that the layer of adhesive material does not tear in such a way as to provide an operation without failure of the device. The sliding element itself in this construction however is decidedly small, for example it can be produced as a semi-finished product of the smallest dimensions (for example with an external diameter of 1 to 1.2 millimeters and 0.2 to 0.3 millimeter wall thickness) and which is cut to the desired length, grooves in the longitudinal dimension and then extends and pushes on the applicator leg. This can be carried out automatically in a simple way. With particular advantage, it is proposed in this case that the sliding element consists of polytetrafluoroethylene (PTFE), since this material has a particularly good sliding property. Obviously, materials with comparable characteristics can also be used. Still further, it is proposed with advantages that the end portion that receives the sliding element of the applicator leg, similarly has a cross-sectional shape that is elliptical at least regionally. The sliding element can then be produced in a particularly simple manner as its internal profile can substantially correspond to the external profile. Then, in addition, it is surely held in the applicator leg. The invention will now be described in a more detailed manner by way of example with reference to the drawings in which: Fig. 1 is a perspective illustration of an applicator leg of a device according to the state of the art, without the sliding element, Fig. 2 is a side view partly in section of the applicator leg, of a device according to the invention, without the sliding element, Fig. 2a is a section of the sliding element of the device according to Fig. 2, Fig. 3 is a front view of the applicator leg, Fig. 4 is a partially sectional side view of the applicator leg according to Fig. 2, with the pivoted extension arm and the sliding element in site, Fig. 5 is a front view of Fig. 4, and Fig. 6 is a perspective view of the applicator leg. A conventional device according to the state of the art for transferring a material in the form of a film applied to a carrier strip on a substrate, is illustrated without the sliding element, in Fig. 2, although only with the parts signifiers of the invention, that is to say an applicator leg which is generally denoted by 1. This applicator leg 1 is equipped with an applicator strip 2, around which a coated carrier strip 3, which comes from a supply reel, which is not illustrates the device, it is guided. After the transfer of the coating 4 onto a substrate is progressed as an empty strip 5 to a winding reel, which is not illustrated. It has emerged that this applicator leg 1: .o is satisfactory with respect to the easy movement of the device and transfer without failure of the film on the substrate. According to the invention, another design of the applicator leg is therefore provided, this is illustrated in Fig. 2 and following. An applicator leg according to the invention of a device according to the invention, is generally denoted by 6 in the figures. This applicator leg 6 comprises strip guiding ears 7 between which the carrier strip is directed. The applicator leg 6 is provided with an extension arm 9 hinged pivotally to the applicator leg 6 by a film hinge 8. This extension arm 9 is formed at its end as a receiver profile member (end portion 10) for a sliding element of fastener type 15. The slots 13 are cut from the applicator leg 6 and serve the purpose of achieving a latch lock of the extension arm 9 to the applicator leg 6 in the pivoted position of the extension arm 9, for which Catch jaws 12 are provided on the extension arm 9 on both outer sides. As is evident in Fig. 3, the extension arm 9 comprises ribs 11 which are preferably oriented longitudinally. These ribs 11 serve in conjunction with a selection of an elastic material, for example polyolefin, to ensure a good particular contact between the applicator strip (end portion 10) and possible non-uniformity of the substrate plane. Since the sliding member of the polytetrafluoroethylene fastener type 15 is similarly elastic, in this way it is claimed that even in the case of a non-planar substrate, the entire transfer width of the strip is subjected to pressure and in a manner similar to a elastic roll, the formation of bubbles is reliably avoided in such a way that a uniform coating on the substrate is carried out. Essentially for the invention, the sliding element 15 has, as is particularly evident in Fig. 2a and 4, an elliptical cross-sectional shape such that before transfer of the film to the substrate, the contact pressure region 15a of the sliding element 15 it rests on an area against the substrate with interposition of the carrier strip. Furthermore, it is provided that the end portion 10, which receives the sliding element 15 of the applicator leg 6 or the extension arm 9, similarly has a cross-sectional shape that is elliptical at least regionally, this region is denoted in FIG. .2 by reference number 10a. Figs. 4 and 5 show the extension arm 9 in a locked and pivoted position. In that case the film hinge 8 is pivoted through approximately 90 °. The fastener-type sliding element 15 placed on the end portion 10 of the extension arm 9 is further clamped in the manner that the butt confinement stages 16 and 17 are provided on the applicator leg 6 or the extension arm 9, thereby that the sliding element 15 is clamped against rotation. It is achieved through the contact of the extension arm 9 with a transverse member 18 of the applicator leg 6 that the end portion 10 of the extension arm 9 can spring completely flexibly. The applicator leg 6 with detent jaws 12 notches in the grooves 13 and the correspondingly attached sliding element 15, is recognized in the front view of the F'ig. 5. Through butt confinements 19 in the applicator leg 6 is achieved, that as in the case of excessive applied pressure possible by improper handling of the device, the applicator strip formed by the sliding element 15 reaches a final end stop confinement. , which is dimensioned in such a way that the sliding element 15 is always projected by a few tenths of a millimeter, beyond the profile of the strip guide ears 7, in such a way that the transfer function remains safe. Even more, it is recognized that the ends 20 of the fastener type sliding element 15 are advantageously arranged to be lowered into the recesses 21 of the strip guide ears 7, thereby ensuring that the carrier strip is kept away from the ends 20 possibly compressed by cutting the length of the tube from which the sliding element 15 is preferably produced. In Fig. 6, the entire applicator leg 6 is illustrated again in a functional position, ie with extension arms locked and pivoted 9, and in particular in the position of the end of the slide member of fastener type 15 fastened against rotation and longitudinal displacement. The invention is obviously not restricted to the illustrated modes. Additional refinements are possible without departing from the basic concept. The sliding element 15 obviously does not have to have an exactly elliptical cross-sectional shape, it being essential that it forms a region of contact pressure per area 15a.

Claims (3)

1. Device for transferring a material in the form of a film applied to a carrier strip on a substrate, such as a sheet of writing or drawing paper, comprising a housing wherein a supply reel for the coated carrier strip with film and an empty spool for receiving the detached carrier strip are arranged, wherein the carrier strip coated with film is guided on an applicator leg which is provided at least in the region that is looped around with the carrier strip with a sliding element of the fastener type and a friction reducing material attached to the applicator leg, characterized in that the sliding element has an elliptical cross-sectional shape such that before transfer of the film on the substrate, the contact pressure region of the sliding element supports on an area against the substrate, with interposition of the carrier strip. Device according to claim 1, characterized in that the sliding element consists of polytetrafluoroethylene (PTFE). Device according to claim 1 or claim 2, characterized in that the end portion that receives the sliding element of the applicator leg, similarly has a cross-sectional shape that is elliptical at least regionally