Browse Prior Art Database

PADDLE WHEEL STRAIGHTENER

IP.com Disclosure Number: IPCOM000027124D
Original Publication Date: 1995-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 95K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure relates to a sheet positioning "paddlewheel" used in an active stacking system of a printer or copier. A sheet stacker system which registers and controls curled paper using a curved baffle and two such paddlewheels (with an accompanying drive system) as sheet registration drivers is contemplated. These paddlewheels have multiple flexible blades which connect to a hub; the flexible blades are elastomerically biased to remain in one position on the hub, yet may be deflected under normal force contact with the stack to provide drive force to correctly place the top sheet of paper in the stack. The angle which the paddlewheel blades make with the axis of the hub may be varied; if the angle is greater than 0 degrees, then there is a combination drive force from the paddlewheel because it then sweeps the sheet into place with a sideward motion as well as a forward driving rotary motion. These features can be particularly useful if sheet side registration is required in addition to paper feed direction registration. Due to machine tolerances, there can be a need to vary side sheet registration; in such cases, the amount of side registration force provided by the paddlewheel(s) may be desirably altered.

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XEROX DISCLOSURE JOURNAL

PADDLE WHEEL STRAIGHTENER Proposed Classification Kenneth P. Moore U.S. C1.271/110 Brian R. Ford Int. C1. B65H 7/04

The present disclosure relates to a sheet positioning "paddlewheel" used in an active stacking system of a printer or copier. A sheet stacker system which registers and controls curled paper using a curved baffle and two such paddlewheels (with an accompanying drive system) as sheet registration drivers is contemplated. These paddlewheels have multiple flexible blades which connect to a hub; the flexible blades are elastomerically biased to remain in one position on the hub, yet may be deflected under normal force contact with the stack to provide drive force to correctly place the top sheet of paper in the stack. The angle which the paddlewheel blades make with the axis of the hub may be varied; if the angle is greater than 0 degrees, then there is a combination drive force from the paddlewheel because it then sweeps the sheet into place with a sideward motion as well as a forward driving rotary motion. These features can be particularly useful if sheet side registration is required in addition to paper feed direction registration. Due to machine tolerances, there can be a need to vary side sheet registration; in such cases, the amount of side registration force provided by the paddlewheel(s) may be desirably altered.

One method of providing variable side sheet registration can result from different paddlewheels having different paddlewheel blade angles, re...