Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
Reexamination Certificate
2002-02-04
2003-08-05
Osele, Mark A. (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work feeding or handling means
C156S523000, C156S579000, C118S076000, C242S160400, C242S171000, C242S588600, C206S411000
Reexamination Certificate
active
06601632
ABSTRACT:
FIELD OF THE INVENTION
The invention refers to a manual device for the transfer of film from a tape applicator and more particularly the present invention relates to a return stop for preventing undesired back rotation of a reel.
BACKGROUND OF THE INVENTION
In a manual device for transferring a film from a backing strip to a substrate (alternately referenced herein as a tape applicator for the sake of convenience), the backing strip carrying the film is supplied on a supply reel, drawn over an applicator tip, at which the backing strip is pressed against the substrate to apply the film, and taken up on a take-up reel. When in an operating mode, the film is withdrawn from the supply reel by a manually generated movement, by means of which the manual device is moved along the substrate, the film being released from the backing strip and the backing strip simultaneously being wound off of the supply reel and onto the take-up reel. To guarantee this mode of operation, the speed at which the material is wound onto the take-up reel must be at least as great as the speed at which it is unwound from the supply reel as otherwise loops would form during recoiling, which could lead to the manual device being unable to function. A drive connection is provided between the supply reel and the take-up reel for the purpose of this specific function which drives the take-up reel in a transmission ratio such that the take-up speed is greater than the unwinding speed of the supply reel. It must be remembered here that the effective outer diameters of the supply reel and the take-up reel are constantly changing as the backing strip is unwound from the supply reel and wound onto the take-up reel. This problem is solved firstly by the drive connection driving the take-up reel so quickly that firstly the winding speed effective there is always the same or greater than the unwinding speed and namely even when the outer diameter of the take-up reel is at its maximum and the outer diameter of the supply reel is at its minimum, and secondly by the drive connection functioning with slip such that although the take-up reel is driven with a constantly effective torque so that the section of backing strip being wound on is under tension, at the same time the slip is effective within the drive connection so that the section of backing strip being wound onto the take-up reel does not tear.
A further problem with the mode of operation of an existing manual device consists of the fact that both the supply reel and the take-up reel each tend to run backwards somewhat after a rotary movement caused by removing the backing strip, which can be caused by stresses in the backing strip. The reels reversing in this way can also cause small loops which can impair the function of the manual device.
A manual device of the type described above, has been described, for example, in patents EP 0 267 396 B2 (corresponding to U.S. Pat. No. 4,851,076 to Manusch et al.), EP 0 680 914 D1 (corresponding to U.S. Pat. No. 5,577,007 to Czech et al.), EP 0 656 308 D1 (corresponding to U.S. Pat. No. 5,556,469 to Koyama et al.), and DE 39 00 156 C2 (corresponding to U.S. Pat. No. 5,049,229 to Czech). In one existing manual device, the supply reel and the take-up reel can be mounted so that they can rotate around axes of rotation which are arranged at a distance from each other, or they can also be mounted so that they can rotate around a common axis of rotation, as described in DE 39 00 156 C2 (corresponding to U.S. Pat. No. 5,049,229).
In the manual device described in EP 0 267 396 B2 (corresponding to U.S. Pat. No. 4,851,076), the drive connection between the supply reel and the take-up reel is formed by a gear wheel drive with an intermediate gear wheel, the return stop meshing with the intermediate gear wheel and being formed by at least one sprung tongue, which is fixed to the housing and meshing with the teeth of the intermediate gear wheel with its sprung free end, the said end extending as a secant. This known design not only contains a large number of elements, but also requires a relatively large space for installation because both the intermediate gear wheel and the sprung tongue must be housed in an unobstructed region inside the housing.
In the manual device described in EP 0 680 914 (corresponding to U.S. Pat. No. 5,770,007), in which the drive connection between the supply reel and the take-up reel takes the form of a friction wheel drive, a return stop for the take-up device is formed by a toothed surface on the radial face surface of a bearing bush of the recoiling reel (see FIG.
3
), the toothed surface meshing with opposing gearing on an opposite surface fixed to the housing. In this known design, the take-up reel must execute small axial movements when rotating through the return stop while operating, the said movements being disadvantageous for both the friction wheel drive and for taking up the backing strip, an additional spring element also being required which strikes the take-up reel with its toothed surface against the opposing gearing.
A design similar to the design described above is provided in a manual device according to EP 0 656 308 (corresponding to U.S. Pat. No. 5,556,469). In this known design, the drive connection between the supply reel and the take-up reel is also formed by a friction wheel drive, the return stop meshing with the take-up reel and being formed by a locking pawl arranged in a cut-out of a friction wheel arranged on the take-up reel, which has a pawl on its free end and is pretensioned elastically with this against a toothed surface, which is formed on an additional toothed ring, and is fixed to the housing on an internal surface of the housing. This known design also needs an additional component, namely the toothed ring, whereby it is also to be expected despite the elastic flexibility of the locking pawl, that if the return stop is turned too far, the take-up reel will make axial movements or will at least be pushed in the direction of axial movements. Therefore, increased wear is to be expected because only a relatively small annular surface on the body of the reel is available as the mounting for the take-up reel.
A manual device is described in DE 39 00 156 C2 (corresponding U.S. Pat. No. 5,049,229), in which the supply reel and the take-up reel are arranged side by side in a coaxial arrangement, the drive connection being arranged between the reel walls, which are adjacent to each other, and being formed by a coupling tooth, which is arranged on a sprung arm which projects radially from the one reel wall and therefore can be moved radially and is struck radially outwards against a gear ring on the other reel wall using elastic pretensioning of the sprung arm. The teeth of the gear ring and the coupling tooth have angled tooth flanks so that the coupling tooth is forced out of the gaps between the teeth when a certain tensile stress is exceeded in the take-up section of the backing strip and the above-mentioned slip takes place in the drive connection. This known design therefore involves a slip clutch in the drive connection between the reels, both components being rotating components. This friction clutch cannot fulfill the function of a return stop. Therefore a return stop is provided which meshes with the supply reel, which is formed by an engaging finger, which meshes with a gear ring on the supply reel in the form of a locking pawl. This design of a return stop is also expensive and has large dimensions and an interior space of a considerable size having to be present for the engaging finger to enable it to be arranged so that it can function. This also leads to a large format for the manual device as a whole.
SUMMARY OF THE INVENTION
The present invention provides a compact device for transferring a film from a backing strip to a substrate, or “tape applicator,” that is economical to manufacture. In accordance with the principles of the present invention, first and second bearing components are provided in coaxial engagement in the device. The first and second bearing co
Bouveresse Jeanne-Antide
Huthmacher Winfried
Melahn Hans-Peter
Poore Scott
Semmler Georg
BIC Deutschland GmbH & Co.
Osele Mark A.
Pennie & Edmonds LLP
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