Browse Prior Art Database

PROCESS DIRECTION OFFSETTING OF SHEETS ON A STACK

IP.com Disclosure Number: IPCOM000026736D
Original Publication Date: 1993-Jun-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 161K

Publishing Venue

Xerox Disclosure Journal

Abstract

As shown in Figure 1, bladed disks 12 are sometimes used in stacking devices to invert and compile sheets of paper, 14. Offsetting of the sheets provides that distinction to se arate jobs, where offsetting refers to the general action of

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XEROX DISCLOSURE JOURNAL

PROCESS DIRECTION OFFSETTING OF SHEETS ON A STACK
Bruce J. Parks

Proposed Classification
U.S. C1.353322 Int. C1. G03g 21/00

14 '

FIG. I

t\ 20

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 3 May/June 1993 289

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PROCESS DIRECTION OFFSETTING OF SHEETS ON A STACK

(Cont'd)

26

A

FIG. 2B

290 XEROX DISCLOSURE JOURNAL - Vol. 18, No. 3 May/June 1993

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

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PROCESS DIRECTION OFFSETTING OF SHEETS ON A STACK

(Cont'd)

As shown in Figure 1, bladed disks 12 are sometimes used in stacking devices to invert and compile sheets of paper, 14. Offsetting of the sheets provides that distinction to se arate jobs, where offsetting refers to the general action of

is typically perpendicular to the process or feed direction. In the stacker configuration illustrated in Figure 1, sheets 14 are delivered to the bladed disks, where they are inverted and dropped on an elevator 16. The elevator indexes up and down in the direction indicated by arrow 20, based on signals from a stack height sensing system. As the height of the paper stack grows, the elevator moves downward in an effort to maintain a relatively constant relationship between the top of the sheet stack and the disks.

shifting a sheet fp rom one registered location to another. The direction of offset

In this disclosure, an apparatus for offsetting sheets in the process direction is described. Specifically, a pair of moving registration walls 24, are first positioned in such a manner that sheets arrive normally at the fixed registration wall 26. Upon completion of the first set compilation, moving walls 24 drop to the top of the sheet stack, and the next set registers at this new position offset by the distance X. Since the top of the stack may be uneven or not of the expected nominal height, each moving wall has a range of vertical freedom, 28, greater than the range of expected stack height conditions, so that the walls can independently seek the top of a stack wherever it may be. After the last sheet of the offset set arrives and settles, the moving walls are again raised to their upper position, and the next set registers at the fixed registration wall.

A co...