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Springloaded Floating Platen Assembly

IP.com Disclosure Number: IPCOM000089578D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 39K

Publishing Venue

IBM

Related People

Cole, NF: AUTHOR [+2]

Abstract

In passbook or other variable media thickness printing machines, it is necessary to provide a clamping mechanism to clamp the passbook or other document firmly to a platen to maintain good print quality and accurate spacing between the surface of the media and the printing elements. It is necessary to avoid crimping or creasing of the media, particularly in the case of passbooks which have magnetic stripe data areas on them.

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Springloaded Floating Platen Assembly

In passbook or other variable media thickness printing machines, it is necessary to provide a clamping mechanism to clamp the passbook or other document firmly to a platen to maintain good print quality and accurate spacing between the surface of the media and the printing elements. It is necessary to avoid crimping or creasing of the media, particularly in the case of passbooks which have magnetic stripe data areas on them.

Fig. 1 illustrates, in a schematic cross-sectional view, the end portion of an elongated spring-loaded platen and stationary clamp bar assembly utilized to firmly clamp a passbook or similar media in a fixed position adjacent a print line, with the surface of the media spaced appropriately from the printing mechanism in a repeatable and accurate fashion. In Fig. 1, a stationary clamping bar 1 extends in and out of the plane of the paper for the full width of the passbook or document media seen in edge view. The media follows a paper path 2 through suitable guide means in the printing machine (not shown). The print line position 3 extends in and out of the paper along the length of platen 4, and the surface of the media for printing is registered by action of the platen 4 and the clamp bar 1 so that it is at a fixed distance from the printing mechanism along print line 3.

Platen 4 has a arcuate surface 5, which avoids any sharp bends that would cause crimping or creasing of a passbook or similar media and has a width in the direction of the media path motion such that the fold in a passbook may be appropriately positioned under clamp 1, while the printing mechanism prints on the print line 3 in the last line of the passbook adjacent to the fold, but without creasing or crimping the passbook in that area. It is necessary that the edge of the clamp bar 1 extend sufficiently over the platen 4 and that the width of the platen 4 be chosen such that printing can be effected in the lines of the passbook adjacent to th...