Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – And with bending
Reexamination Certificate
1998-12-15
2001-01-23
Vo, Peter (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
With cutting, breaking, tearing, or abrading
And with bending
C493S060000, C493S194000, C493S241000, C493S287000, C493S351000, C493S364000
Reexamination Certificate
active
06176819
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention refers to a device for embossing a foil, the device comprising a pair of rollers which are provided with teeth of the same kind and which are coupled to a drive and capable of being driven in common, the rollers being capable of being pressed against each other in a resilient manner, and to a method for the operation of a device for embossing a foil which comprises a pair of rollers having toothings of the same kind which engage in each other in operation. A device of this kind is described in detail in U.S. Pat. No. 5,007,271. This known embossing device was based upon the problem of achieving both a high quality of the embossing and in particular a mutual synchronization of the embossing rollers in spite of the relatively fine teeth of the latter while only one of the rollers is driven and in turn drives the other roller. It had been found that these requirements were difficult to fulfill if the two rollers were equally provided with hardened teeth in order to ensure acceptable lifetimes of the rollers.
In order to fulfill the requirement of the mutual synchronization of the embossing rollers, the rollers were mutually aligned in such a manner that the circumferential rows of teeth of both rollers lie in the same plane, so that the flanks of the teeth in the meshing area of the two rollers contact one another and a forced driving of the idle roller by the driven roller results.
The mentioned disposition resp. the mutual alignment of the embossing rollers has been practical as long as the embossed foils, especially packing foils, were mainly aluminum foils. Recently, however, paper foils are increasingly used or even prescribed. These foils are substantially stiffer than aluminum foils, and it has been found that the known embossing rollers are no longer adapted to the requirements.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a device which fulfills the new requirements, i.e. which allows an optimal embossing of any kind of foils. This object is attained by a device for embossing a foil wherein said device comprises a mode of operation in which the rollers are moveable relative to each other and mutually displaceable in positions of determined engagement of the roller teeth in order to allow a self-stabilizing operation. The dependent claims describe particular characteristics of an exemplary embodiment.
The invention further refers to an application of the device of the invention for the embossing of foils which are mainly composed of paper, and to a method for the manufacture of the embossing rollers wherein the teeth is exposed to an erosion subsequent to its shaping.
As mentioned, the determined mutual position of engagement of the roller teeth which is intended according to the invention not only ensures a stable mutual driving and a synchronization of the roller rotation but also an optimal embossing independently of the materials to be embossed. Therefore, the invention further refers to a method for the operation of a device for the purpose of embossing a foil wherein in continuous stationary operation, the rollers are operated in a mutual position in which each tooth in the contact area of each roller is enclosed at least approximately symmetrically between four teeth of the other roller.
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patent: 5007271 (1991-04-01), Boegli
patent: 5036758 (1991-08-01), Kobayashi et al.
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patent: 5379019 (1995-01-01), Fiddes et al.
patent: 5571425 (1996-11-01), Watzlaw
patent: 5598774 (1997-02-01), Boegli
patent: 2040042 (1971-03-01), None
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patent: 139066 (1985-05-01), None
patent: 2311949 (1997-10-01), None
Boegli Charles
Wist Bernard
Boegli-Gravures S.A.
Desai Hemant M.
Foley & Lardner
Vo Peter
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