Browse Prior Art Database

Paper Tension Mechanism

IP.com Disclosure Number: IPCOM000082402D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Herriford, DL: AUTHOR [+2]

Abstract

When a clamp-belt arrangement is used to index paper past a print station the trailing edge is normally not gripped, which results in the last several inches of paper not conforming to the outside surface of the print drum. This results in poor print quality near the bottom of the page.

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Paper Tension Mechanism

When a clamp-belt arrangement is used to index paper past a print station the trailing edge is normally not gripped, which results in the last several inches of paper not conforming to the outside surface of the print drum. This results in poor print quality near the bottom of the page.

In a high-speed printer, the large inertial load of the system also presents a problem in that the drum oscillates some small amount after an index has been made. This could cause more than the desired amount of paper to pass the print point during an index.

The paper tension mechanism shown provides a pinch point on the drum approximately 0.100 of an inch below the print point. This pinch point forces the entire length of the paper to conform to the drum surface, so that it can be printed on up to approximately the last 1/4 inch of the paper.

To handle the problem of the drum oscillation, the friction force between the paper tension spring and paper is adjusted such that it is greater than the friction force between the paper and the drum. This friction differential allows the drum to slip with respect to the paper, so that the amount of paper passing the print point is not affected by the oscillation of the drum during its settle-out time after indexing.

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