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Optimization of FEED and EJECT Cycle for Printers That Use Automatic Cut Sheet Feeders

IP.com Disclosure Number: IPCOM000062691D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Nguyen, HH: AUTHOR [+2]

Abstract

On word processing printers with a detachable cut sheet feeder or with integrated cut sheet handling capability, the time it takes to feed or eject a sheet is pretty significant compared with the printing time. For example, it can take up to 5 seconds to feed or eject a sheet. This time becomes more significant as the printing speed increases. Since the printer throughput depends on both the print speed and the speed to handle paper, it is desirable to cut down the feed and eject time of a printer. Traditionally, the printer electrical architecture includes a processor to control the printer mechanism (mechanism processor) and another processor to control the formatting of the printed data and other high level functions (printer processor). The two processors talk with each other through a well-defined logical interface.

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Optimization of FEED and EJECT Cycle for Printers That Use Automatic Cut Sheet Feeders

On word processing printers with a detachable cut sheet feeder or with integrated cut sheet handling capability, the time it takes to feed or eject a sheet is pretty significant compared with the printing time. For example, it can take up to 5 seconds to feed or eject a sheet. This time becomes more significant as the printing speed increases. Since the printer throughput depends on both the print speed and the speed to handle paper, it is desirable to cut down the feed and eject time of a printer. Traditionally, the printer electrical architecture includes a processor to control the printer mechanism (mechanism processor) and another processor to control the formatting of the printed data and other high level functions (printer processor). The two processors talk with each other through a well-defined logical interface. In these logical interfaces, primitive commands are used by the printer processor to control individual operations to be performed by the mechanism processor. For example, these commands include INDEX, ESCAPE, PRINT, FEED, EJECT, ... Normally, after a page has been printed, the printer processor sends an EJECT command down to the mechanism processor to eject the page. After this operation has been successfully completed, the printer processor then sends a FEED command to feed in the next sheet before printing can start again. These feed and eject cycles are time consuming and, since they are done in a serial fashion, degrade the overall printer performance. In most other...