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AUTO-DUPLEX/SIMPLEX FEEDER MODULE

IP.com Disclosure Number: IPCOM000025654D
Original Publication Date: 1987-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 239K

Publishing Venue

Xerox Disclosure Journal

Abstract

In conventional printers, a sheet feed cassette is detachably installed in the main body of the printer and sheets are fed from the cassette into the printer by feed rollers mounted in the printer main body. The cassette is used for stacking and storing sheets therein with an additional function of the cassette being to support sheets ouside the main body of the printer. Therefore, the feed rollers are driven through a transmission mechanism, such as gears or a chain, by a motor mounted within the printer main body. For duplexing, the printer requires several trays and complicated architecture which makes for complications and a wide installation and operation area. For example, most machines that are capable of duplexing have a dedicated duplex tray as well as two or three copy sheet trays which makes for larger and more costly machines. Thus, a problem is presented for reducing printers to a small, lightweight and compact size while maintaining the duplex function and reducing machine costs.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

AUTO-DUPLEXISIMPLEX

FEEDER MODULE Robert L. Greco, Jr.

Proposed Classification

U.S. C1.271/271 Int. C1. B65h 5/16

7 ?+

CONTROLLER

I' ' Y""'

41

1

Volume 12 Number 1 January/February 1987 11

[This page contains 1 picture or other non-text object]

Page 2 of 4

AUTO-DUPLEX/SIMPLEX FEEDER MODULE (Cont'd)

In conventional printers, a sheet feed cassette is detachably installed in the main body of the printer and sheets are fed from the cassette into the printer by feed rollers mounted in the printer main body. The cassette is used for stacking and storing sheets therein with an additional function of the cassette being to support sheets ouside the main body of the printer. Therefore, the feed rollers are driven through a transmission mechanism, such as gears or a chain, by a motor mounted within the printer main body. For duplexing, the printer requires several trays and complicated architecture which makes for complications and a wide installation and operation area. For example, most machines that are capable of duplexing have a dedicated duplex tray as well as two or three copy sheet trays which makes for larger and more costly machines. Thus, a problem is presented for reducing printers to a small, lightweight and compact size while maintaining the duplex function and reducing machine costs.

As a solution to this problem, a self-contained multi-purpose feeder module 10

is shown in Figure 1 as it would appear in a printing apparatus. Inasmuch as the art of electrostatographic printing is well known, the operation of the various processing stations employed in such a machine will not be discussed in detail, however, suffice it to say that an image on photoconductive member 48 is transferred to a co y sheet by transfer corotron 40. The copy sheet is

duplex apparatus. The feeder module 10 is adapted for a multitude of uses. It can be used as a sheet feeder to feed virgin sheets to the photoconductive surface to have document images placed on them or it can be used as a feeder for duplex copying. In addition, the module is designed to allow sheets to be fed from the bottom of the module by a feed roll that is not enclosed within the module. For simplex copying, ordinarily a sheet is fed from the module 10 by clutch actuated and controlled feed roll 30 that rotates O-ring belts 31 which ide the sheet in forward movement. The feed roll buckles the sheet away

Ern the stack of sheets in the tray by the use of corner snubbers 50. A normal force plate 20 insures sufficient friction between the bottom sheet in module and feed roll 30. The sheet is then forwarded onto O-ring belts 35 that are mounted around idler rolls 36 and into a driving nip formed between rolls 33 and 34. From nip 33, 34 the sheet follows the route of the arrows in Figure 1 into engagement with photoconductive surface 48 and has an image transferred to it by transfer corotron 49. The sheet is then routed into the output tray shown in phantom lines.

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