Browse Prior Art Database

High Precision Paper Feeding Mechanism using Tractor and Rollers

IP.com Disclosure Number: IPCOM000103494D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 50K

Publishing Venue

IBM

Related People

Bahrami, H: AUTHOR [+3]

Abstract

Disclosed is a continuous form feeding mechanism that will maintain very accurate registration by preventing many of the feeding problems related to traditional forms tractor or drive roller feeding approaches.

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High Precision Paper Feeding Mechanism using Tractor and Rollers

      Disclosed is a continuous form feeding mechanism that will
maintain very accurate registration by preventing many of the feeding
problems related to traditional forms tractor or drive roller feeding
approaches.

      The figure shows the proposed feeding mechanism.  A pair of low
cost 4-pin forms tractors (1) at the paper entrance are used to
control the skew of the continuous form.  A friction roller pair
consisting of a grit wheel roller (2) and an idler roller (3) is used
to meter the paper (4).  The method was chosen to maintain a high
friction force at the contact point with paper.  This will prevent
any paper slippage due to the tractor load.  When the paper is
advanced by the friction roller pair, the tractors only keep it from
moving sideways.

      Many printers require that paper feed mechanisms maintain a
paper registration error below 0.0015 inch. High-resolution color
printing is one such example. Printers with traditional forms
tractors cannot maintain such accuracy due to manufacturing
tolerances, in both the mechanism and the paper.  This is also true
of printers using feed rollers to meter the paper, where sideways
motion of the paper causes a cumulative skewing error.

      This proposed mechanism is most appropriate for single part
continuous form paper used in non-impact printers requiring high
resolution.

      Disclosed anonymously.