Browse Prior Art Database

Low Inertia Paper Two Stage Handling

IP.com Disclosure Number: IPCOM000034238D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Mathews, RD: AUTHOR

Abstract

The present invention discloses a paper shuttle printer having high throughput, and continuous or cut sheet paper capability. Present printhead mechanisms have a high inertia which reduces throughput and produces noise when it is necessary to stop and start the mechanism. The present invention utilizes a low inertia paper drive system which permits rapid paper movement in front of the stationary printhead(s), and allows "indexing" of the printheads to the next print line during the change of direction of the paper. The time required to change direction of the paper is easily matched to the fastest index time of the printheads. The disclosed paper-handling system comprises two stages. The first stage feeds or advances a sheet of paper into a ready-to-print position.

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Low Inertia Paper Two Stage Handling

The present invention discloses a paper shuttle printer having high throughput, and continuous or cut sheet paper capability. Present printhead mechanisms have a high inertia which reduces throughput and produces noise when it is necessary to stop and start the mechanism. The present invention utilizes a low inertia paper drive system which permits rapid paper movement in front of the stationary printhead(s), and allows "indexing" of the printheads to the next print line during the change of direction of the paper. The time required to change direction of the paper is easily matched to the fastest index time of the printheads. The disclosed paper-handling system comprises two stages. The first stage feeds or advances a sheet of paper into a ready-to-print position. This stage may be initiated by manually feeding cut paper by way of a front insert path, or it may be initiated by way of a pinwheel drive mechanism. As illustrated in the figure, a pinwheel 1 advances the equivalent of one sheet of paper of a web of continuous forms, causing it to balloon out loosely in the platen area of the printer. Operation of this stage is intermittent, with the pinwheel being stationary when the printheads are printing. The pinwheels are reactivated only when a new sheet of paper is needed in the platen area. This first stage does not provide for accurate placement of paper in front of a printhead during a print cycle. The second stage of this p...