Printing – Printing members – Rolling contact
Patent
1997-11-25
1999-08-17
Burr, Edgar
Printing
Printing members
Rolling contact
101 22, 101375, B41F 1310
Patent
active
059377593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention concerns a stamping roller intended for a stamping apparatus, which has a central carrier roller and stamping punch portions which are spaced from each other in the peripheral direction, wherein fixed to the carrier roller is at least one punch ring whose two axially mutually spaced edge portions are designed with spacer rings for the defined contact of at least one associated backing roller, and the at least one punch ring is designed with the stamping punch portions between the two associated spacer rings.
2. Description of the Prior Art
A stamping roller, or embossing roller, is known from WO 94/13487 A1, in which a specific stamping roller is required for different substrates to be stamped or embossed, according to the way in which the substrates are respectively divided up into respective pieces or portions. That means that a known stamping roller of that kind is only suitable for stamping large numbers of items because such stamping rollers are expensive and so-to-speak exhibit no flexibility. In addition, when such a known stamping roller is of large dimensions, minimal deviations from the ideal cylindrical shape, as can occur for example due to temperature influences, can give rise to considerable quality problems in the stamping operation, that is to say in the respective operation for transferring decoration from the stamping foil onto the substrate, because the pressure or backing rollers which press against the stamping roller can provide for only limited compensation in respect of such deviations from the ideal cylindrical shape for the stamping roller, or tolerance compensation.
A stamping roller intended for a stamping apparatus is known from German patent specification No. 233 239, which stamping roller has a central carrier roller and stamping punch portions which are spaced from each other in the peripheral direction, wherein a number of punch rings are fixed to the carrier roller in closely adjacent relationship. The punch rings are arranged between two lateral spacer rings. Those two lateral spacer rings serve therein not for defined contact of an associated backing roller, but for passing through and securing fixing bars for holding together the punch rings which are arranged in closely adjacent relationship.
DE 27 53 296 C2 describes a slur ring arrangement for producing a defined interaxial spacing between two printing mechanism cylinders of a rotary printing mechanism with two slur rings mounted at a respective end of each of the two printing mechanism cylinders and which rotate with the printing mechanism cylinders and which can roll against each other in a prestressed condition and with continuous contact with each other, at least one thereof being fixed with its central bore on the shaft of the associated printing mechanism cylinder. To prevent slur ring wear it is proposed therein that in the case of the slur ring which is fixed on the shaft of the printing mechanism cylinder, the support surface at the shaft of the printing mechanism cylinder is convex and the support surface in the central bore of the slur ring is correspondingly concavely curved.
DE 85 18 933 U1 discloses a stamping roller with a heatable roller core and a roller shell which is supported thereon and which is engraved on its peripheral surface, wherein the roller core, at least in the region of its support with the roller shell, comprises a material with a higher coefficient of thermal expansion than the roller shell.
The object of the present invention is that of providing a stamping roller of the kind set forth in the opening part of this specification, in which a variable arrangement of the stamping punch portions is possible as desired and in which tolerances or possible deviations from the ideal cylindrical shape of the stamping roller and truth-of-rotation thereof can be compensated, using simple means.
In a stamping roller of the kind set forth in the opening part of this specification, in accordance with the invention, that object is atta
REFERENCES:
patent: 3590452 (1971-07-01), Macleod
patent: 3693544 (1972-09-01), Trzyna
patent: 4917103 (1990-04-01), Katz
patent: 5706731 (1998-01-01), Francille et al.
Mitsam Reinwald
Schaede Johannes Georg
Burr Edgar
Ghatt Dave A.
Marn Louis E.
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