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Drum Printer Document Registration

IP.com Disclosure Number: IPCOM000087614D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Thorne, WD: AUTHOR

Abstract

The figure illustrates a mechanism which provides running clearance for a document clamped to a rotating drum. The document may be of various thicknesses, such as a bank passbook, that must be compressed for proper printing. The drum 1 rotates in the printing machine in the direction of the arrow. It is mounted on a drum pivot 2 and has a clamping mechanism 3 for clamping a document 4 of variable thickness by its leading edge to the surface of drum 1. A registration bar 5, affixed axially in a position adjacent to the drum 1, extends fully along the length of drum 1.

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Drum Printer Document Registration

The figure illustrates a mechanism which provides running clearance for a document clamped to a rotating drum. The document may be of various thicknesses, such as a bank passbook, that must be compressed for proper printing. The drum 1 rotates in the printing machine in the direction of the arrow. It is mounted on a drum pivot 2 and has a clamping mechanism 3 for clamping a document 4 of variable thickness by its leading edge to the surface of drum 1. A registration bar 5, affixed axially in a position adjacent to the drum 1, extends fully along the length of drum 1.

A print head 6, e.g., a wire matrix or an indexing print wheel, is schematically shown. The print head is arranged with a mechanism (not shown) to traverse the length of the drum along a print line. It is desired that sufficient clearance be permitted between print head 6 and the surface of drum 1, at the clamp 3 and document 4, to allow free rotation of the assembly. However, it is also desired for good printing quality that the document be pressed against a registration surface, such as registration bar 5. To accomplish this, the entire assembly of print drum 1 and its pivot 2 are mounted in a tiltable frame 7 which is pivoted to a main, fixed frame 8, by pivot 9. A return spring 10, mounted between the pivoting frame 7 and the fixed frame 8, returns the pivoting frame mechanism back against a stop 14 when registration is not required.

When registration is require...