Browse Prior Art Database

NIP PROFILE MEASUREMENT USING AN ARRAY OF FORCE SENSING RESISTORS

IP.com Disclosure Number: IPCOM000027162D
Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

An array of force sensing resistors to determine the pressure profile of a nip between two surfaces is disclosed. Traditionally, the measurement of a nip can only be done with two methods, namely by a pullout force measurement or by a thermal or pressure sensitive transfer paper measurement. Both of these methods fail to give a precise reading of the nip pressure across the entire width of the nip and fail to measure normal gripping force at the nip. It is desirable to measure the pressure profile of the nip so that irregularities in the nip that lead to high and low pressure spots can be identified. In the particular application of a gripper bar used to hold the lead edge of a sheet for transport, this uniformity of pressure is key to properly registered sheet printing.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

NIP PROFILE MEASUREMENT USING AN ARRAY OF FORCE SENSING RESISTORS
Eric A. Merz
John William Prebola
Frank C. Darling, Jr.

Ernest S. Wilson Roger M. Swanson

Proposed Classification
U.S. C1.0731862 Int. C1. HOlc 10/10

An array of force sensing resistors to determine the pressure profile of a nip between two surfaces is disclosed. Traditionally, the measurement of a nip can only be done with two methods, namely by a pullout force measurement or by a thermal or pressure sensitive transfer paper measurement. Both of these methods fail to give a precise reading of the nip pressure across the entire width of the nip and fail to measure normal gripping force at the nip. It is desirable to measure the pressure profile of the nip so that irregularities in the nip that lead to high and low pressure spots can be identified. In the particular application of a gripper bar used to hold the lead edge of a sheet for transport, this uniformity of pressure is key to properly registered sheet printing.

The first known method entails measuring overall nip force by pulling a sheet out from the nip and measuring the force required to do so. This, however, will only yield a total force for the entire nip. To determine a nip force profile, smaller widths of paper would be needed to determine the force of each section of the nip. This method thus requires significant effort and time to characterize each narrow sheet width nip. (E.g.? cutting, loading and measuring pullout force for each sheet). Further, this type of measurement does not have a high d...