Browse Prior Art Database

INVERTER DESKEW

IP.com Disclosure Number: IPCOM000027536D
Original Publication Date: 1997-Aug-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is an application of an electronic deskew device using sensors and stepper motor control to remove skew in a reversing roller inverter. Figure 1 schematically illustrates an inverter 10 comprising a shaft 14 having two reversing rollers 12 and 13 attached at opposite ends thereof. A servo motor 16 and a coupling assembly 18 drive shaft 14 and reversing roller 12, as shown by arrow 28. A stepper motor 20 and a coupling assembly 22 independently drive the other reversing roller 13, as shown by arrow 26. The reversing roller 13 connects to coupling assembly 22 by way of a pulley 24.

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XEROX DISCLOSURE JOURNAL

INVERTER DESKEW

Joseph S. Vetromile

Proposed Classification
U. S. C1. 399/398 Int. C1. G03g 21/00

FIG. 7

26

7 6' 20'

32 30

I I II

Q

34 36 V 9

1

I

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 22, NO. 4 July/August 1997 207

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INVERTER DESKEW (CONT'D)

Proposed is an application of an electronic deskew device using sensors and stepper motor control to remove skew in a reversing roller inverter. Figure 1 schematically illustrates an inverter 10 comprising a shaft 14 having two reversing rollers 12 and 13 attached at opposite ends thereof. A servo motor 16 and a coupling assembly 18 drive shaft 14 and reversing roller 12, as shown by arrow 28. A stepper motor 20 and a coupling assembly 22 independently drive the other reversing roller 13, as shown by arrow 26. The reversing roller 13 connects to coupling assembly 22 by way of a pulley 24.

The addition of stepper motor 20 to drive reversing roller 13 provides a means for deskewing a duplexed sheet in inverter 10. The stepper motor driven nip at roller 13 changes velocity with respect to the nip at roller 12, thereby adjusting the skew position of the sheet. The adjustment occurs whenever the sheet enters inverter 10, when inverter 10 stops, or when the sheet exits inverter 10. Figure 2 illustrates the case signified by arrow 32 where sheet 30 enters inverter 10. In Figure 2, sensors 34 and 36 measure the sheet skew. By using an encoder...