Browse Prior Art Database

Method and apparatus to control feed/retard roll nip force distribution in a retard roll based paper feeder

IP.com Disclosure Number: IPCOM000130688D
Publication Date: 2005-Nov-01
Document File: 2 page(s) / 105K

Publishing Venue

The IP.com Prior Art Database

Abstract

Paper feed roll/retard roll sets require that the mating rolls produce even loading to minimize paper skew. This invention seeks to minimize paper skew and enhance feeding characteristics by enabling even retard roll force distribution in a multiple roll system and to maximize roll conformance by allowing a gimbal effect (2 directional conformability) between rolls.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Method and apparatus to control feed/retard roll nip force distribution in a retard roll based paper feeder

Paper feed roll/retard roll sets require that the mating rolls produce even loading to minimize paper skew.  The invention depicted in this proposal is used in an active retard feeder system optimized to feed coated stock.  Previous methods include matching spring sets and single spring designs that exert force on the center of the retard shaft.

This invention seeks to minimize paper skew and enhance feeding characteristics by enabling even retard roll force distribution in a multiple roll system.  This proposal explores a 2-roll system but may also be applicable to multiple roller sets.  The invention seeks to maximize roll conformance by allowing a gimbal effect (2 directional conformability) between rolls.


Figure 1:

Depiction of feed roll/retard roll set and nudger rolls in prototype for feeding coated

stock.  Figure 1 depicts current fixture design configuration.  Elongated/enlarged holes in pivot plates prevent binding as well as allow rolls freedom to seek an even load position state. 

Note: This design assumes fixed feed rolls (upper rolls).  An alternate embodiment may allow loading and adjustability of either feed or retard rolls or relative motion of both feed and retard rolls.