Browse Prior Art Database

VACUUM COPY FEEDER COPY SENSING DEVICE

IP.com Disclosure Number: IPCOM000027005D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 106K

Publishing Venue

Xerox Disclosure Journal

Abstract

A device for preventing sheet jams in a copier or printer includes a vacuum source with a sensor for detecting variations in the system vacuum caused by the absence of a copy sheet at the vacuum openings of a vacuum feedhead. When the absence of a sheet is detected by the sensor, a signal is sent by a microcomputer to the sheet feedhead motor stopping it until the sheet is presented at the vacuum openings.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

VACUUM COPY FEEDER COPY SENSING DEVICE U.S. C1.271/260
George J. Roller

Proposed Classification
Int.
C1. B65h 7/06

32

MICROCOMPUTER

F/G. I

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 NovembedDecember 1994 441

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

Page 2 of 4

VACUUM COPY FEEDER COPY SENSING DEVICE(Cont'd)

START

0

SHEET

T 4 0

44 48 SHEET 7

PROGRESSES

46

I

VACUUM MOTOR

 NO SHEET PROGRESSES

I I

FIG. 2

442 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 NovembedDecember 1994

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

Page 3 of 4

VACUUM COPY FEEDER COPY SENSING DEVICE(Cont'd)

A device for preventing sheet jams in a copier or printer includes a vacuum source with a sensor for detecting variations in the system vacuum caused by the absence of a copy sheet at the vacuum openings of a vacuum feedhead. When the absence of a sheet is detected by the sensor, a signal is sent by a microcomputer to the sheet feedhead motor stopping it until the sheet is presented at the vacuum openings.

Often the copy sheet does not arrive at the vacuum feedhead within the allotted time. When a feedhead actuates in these cases, a paper jam often occurs. Sensing whether a sheet is located in the feedhead and ready to be fed will minimize the occurrence of jams.

Referring to Figure 1, vacuum pump 12 provides a vacuum source through conduits 14 and 16 to vacuum openings 18 and 20, respectively of vacuum feedhead 22 . Sheet 24 is fed into vacuum feedhe...