Browse Prior Art Database

DIRECT DRIVE PERISTALTIC PUMP SHAFT

IP.com Disclosure Number: IPCOM000027846D
Original Publication Date: 2001-Apr-30
Included in the Prior Art Database: 2004-Apr-09
Document File: 2 page(s) / 71K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a direct drive peristaltic pump shaft in which the flow is produced by peristaltic action, for example, by rollers passing in succession over a length of flexible tube. Xerox Disclosure Journal - Vol. 25, No. 2 MarchlApril2001

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XEROX DISCLOSURE JOURNAL

DIRECT DRIVE PERISTALTIC PUMP SHAFT U. S. C1. 347/022 Paul F. Sawicki

Proposed Classification

Int. C1. B41j 02/165

II U 22

Disclosed is a direct drive peristaltic pump shaft in which the flow is produced by peristaltic action, for example, by rollers passing in succession over a length of flexible tube.

Xerox Disclosure Journal - Vol. 25, No. 2 MarchlApril2001 63

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DIRECT DRIVE PERISTALTIC PUMP SHAFT (Cont'd)

Typically, maintenance station peristaltic pumps used in Thermal Ink Jet (TIJ) products employ a three-roller, friction-drive mechanism. This type of mechanism is simply a center shaft pressed centrally through the three pump rollers. The disadvantage of this usage is tolerance sensitivity, particularly in the shaft dimension. The shaft must be accurately sized in order to provide the correct amount of friction with the rollers when the shaft sets an interference fit of the pump tube to the outer race of the pump housing. The drive system is inefficient too, in that slippage occurs at high speeds of rotary motion measured in revolutions per minute.

The direct drive peristaltic pump shaft disclosed herein corrects the problem, by positively driving a pump 10 having a single input drive shaft 26 with an assemblage of shaft appendages 24 mechanically coupled thereto and driven by a gear 22. Shaft appendages 24 interact with drive rollers 20 internal to pump 10. Shaft-to-r...