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PRINTER WITH MULTIPLE-SIZE SHEETS DUPLEX TRAY ASSEMBLY

IP.com Disclosure Number: IPCOM000027295D
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Document File: 6 page(s) / 411K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to electrostatographic reproduction machines, including printers, and more particularly to such a machine having a duplex tray assembly for handling sheets of various sizes and orientations without a risk of sheet jams due to sheet skew.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 23% of the total text.

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XEROX DISCLOSURE JOURNAL

PRINTER WITH MULTIPLE-SIZE Proposed Classification SHEETS DUPLEX TRAY U.S. C1.355/311 ASSEMBLY Int. C1. G03g 21/00
Gerald M. DeVito

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 21, No. 1 January/February 1996 61

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

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PRINTER WITH MULTIPLE-SIZE SHEETS DUPLEX TRAY ASSEMBLY (Cont'd)

(

130 134 156-

- 4 t

144-

FIG.2

62 XEROX DISCLOSURE JOURNAL

- Vol. 21, No. 1 January/February 1996

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

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PRINTER WITH MULTIPLE-SIZE SHEETS DUPLEX TRAY ASSEMBLY (Cont'd)

This disclosure relates to electrostatographic reproduction machines, including printers, and more particularly to such a machine having a duplex tray assembly for handling sheets of various sizes and orientations without a risk of sheet jams due to sheet skew.

In printing machines for performing duplex copying as such, it is known to provide a paper or sheet path in addition to imaging means that are each capable of accommodating LEF (long edge first) orientation sheets, or SEF (short edge first) orientation sheets. For example, in very low cost small machines it is desirable to provide only narrow imaging means for accommodating 8-1/2 x 11 inch sheets that are fed in an SEF (short edge first) orientation along a sheet path. The width or cross-path dimension of the sheet path and of the imaging elements in such a machine are therefore only required to accommodate the 8-1/2 inch dimension of the sheet, not the 11 inch dimension thereof. Similarly, in larger machines, it may be required to provide wider means for accommodating sheets having a cross-path edge dimension of at least 11 inches. Ordinarily, this is the long edge of an 8-1/2 x 11 inch sheet, fed LEF (long edge first). One current trend in the design of such machines is towards increasing the speed or number of sheet copies each machine can produce per unit time. Higher speeds as such therefore are ordinarily likely to create special sheet handling problems, such as skewing of sheets received and stacked in the duplex tray.

Skewed sheets in the duplex tray are particularly undesirable because such sheets already have a registered image on a first side thereof, and must be refed to receive a second image on its second side such that the second image is registered both to the second side and to the image on the first side. A skewed sheet in the duplex tray is likely to be refed misregistered, as well as likely to cause a jam along the sheet path.

Referring now to Fig. 1 of the drawings, an embodiment of an exemplary electrostatographic printing machine 9 is illustrated incorporating the features of the present invention. As shown, machine 9 employs a belt 10
having a photoconductive surface 11. Belt 10 moves in the direction of arrow 12 to advance successive portions thereof sequentially through the various processing stations disposed about a path of movement of the belt. Belt 10 is entrain...