Browse Prior Art Database

PAPER FEED DEVICE

IP.com Disclosure Number: IPCOM000025302D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 6 page(s) / 172K

Publishing Venue

Xerox Disclosure Journal

Abstract

Top and bottom paper feeders, which employ vacuum systems, can utilize either belt or slide carrier devices. The concepts proposed here are directly apolicable to slide feeder systems. In a slide feeder system shown in drawing Figure 1, motion of slide 2 when feeding a single sheet 3 requires that slide 2 remain stationary during the sheet acauisition- /stack levitation time interval, transport the sheet 3 to the take away rolls, present the sheet 3 to the take away rolls such that the transfer is successful each cycle, and return the slide 2 to the initial position so that any variation in the stop position of the driving motor does not have any meaningful effects on the slide location.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

PAPER FEED DEVICE Kent W. Hemphill Milton J. Profant

Proposed Classification
U.S. CI. 27 1 /99 Int. C1. R65h 3/08

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Volume 9 Number 4 3uly/August 1984 339

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Page 2 of 6

PAPER FEED DEVICE (Cont'd)

FIG 3

240 XEROX DISCLOSTJRE JOIJRNAL

Volume 9 Number 4 July/August 1984

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Page 3 of 6

PAPER FEED DEVICE (Cont'd)

FIG. 6

  XEROX DISCLOSURE JOURNAL 74 Volume 9 Number 4 July/August 1984 1

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Page 4 of 6

PAPER FEED DEVICE (Cont'd)

Top and bottom paper feeders, which employ vacuum systems, can utilize either belt or slide carrier devices. The concepts proposed here are directly apolicable to slide feeder systems.

In a slide feeder system shown in drawing Figure 1, motion of slide 2 when feeding a single sheet 3 requires that slide 2 remain stationary during the sheet acauisition- /stack levitation time interval, transport the sheet 3 to the take away rolls, present the sheet 3 to the take away rolls such that the transfer is successful each cycle, and return the slide 2 to the initial position so that any variation in the stop position of the driving motor does not have any meaningful effects on the slide location.

Tests have shown that the simple harmonic motion fSHM) obtained with a slider- crank mechanism shown in Figure 2 meets the above requirements while also providing low cost, high reliability, low audible noise, low dynamic force levels in the entire system, absence of vibration problems, and lone life.

In addition, tests have shown that an AC stepper/synchronous motor can be successfully utilized in the SHM system because of the SHM's insensitivity to average size AC stepper/servo motion, motion/location errors at the critical points in the feed cycle (initial position and end of stroke position). The AC stepper motor is thus highly compatible with the SHM system and, in addition, provides low codoff the shelf high reliability (i.e., no contacting moving parts or brushes), low audible noise, very low force levels, no vibration problems, and long life.

A vacuum suction pressure is applied to a plenum chamber 4 located under the slide
2. The slide 2, in turn, acquires the paper sheet 3 to its surface through holes 5 in the slide 2. After the sheet 3 is acquired to the surface of the slide 2, a significant pressure differential exists across the top and bottom of the slide. This differential is maintained throughout the slide stroke until the sheet reaches the take away rolls. During this portion of the slide stroke, very significant draq forces are generated on the slide 2 which seriously increases the slide motion motor power requirements and impairs achievement of the allowed cvcle time.

A design concept to reduce the slide vacuum drag force to negligible magnitude is...