Browse Prior Art Database

DUAL OR TRI-ROLLER ROTARY SPEED CONTROLLER

IP.com Disclosure Number: IPCOM000027801D
Original Publication Date: 1999-Oct-31
Included in the Prior Art Database: 2004-Apr-09
Document File: 4 page(s) / 125K

Publishing Venue

Xerox Disclosure Journal

Abstract

The above-cited patent describes using "dancer" rolls or the like for controlling variable length paper web loops to enable seamed belt photoreceptors to print onto roll fed paper at high speeds without ever encountering the photoreceptor seam, or wasting paper. Heavy rolls of paper cannot be started and stopped rapidly. The dancer rolls function to take up paper in an expanding web loop while transfer is interrupted briefly for the seam without interrupting the roll feeding. This stops a minor portion of the paper web while the seam on the photoreceptor goes by the transfer station.

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XEROX DISCLOSURE JOURNAL

DUAL OR TRI-ROLLER ROTARY SPEED CONTROLLER U. S. C1. 3991384 Satchidanand Mishra

Proposed Classification

Int. C1. G03g 15/00

FIG. 7

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 24 No. 5 SeptembedOctober 1999 23 I

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DUAL OR TRI-ROLLER ROTARY SPEED CONTROLLER (Cont'd)

FIG. 3

The above-cited patent describes using "dancer" rolls or the like for controlling variable length paper web loops to enable seamed belt photoreceptors to print onto roll fed paper at high speeds without ever encountering the photoreceptor seam, or wasting paper. Heavy rolls of paper cannot be started and stopped rapidly. The dancer rolls function to take up paper in an expanding web loop while transfer is interrupted briefly for the seam without interrupting the roll feeding. This stops a minor portion of the paper web while the seam on the photoreceptor goes by the transfer station.

The disclosed system replaces dancer rolls in these or other applications with a dual roller or tri-roller device which lengthens or shortens a segment of the web by rotating the device to provide intermittent speed adjustments.

The principle of this device is shown schematically in the example 10 of the Fig. 1. It consists of two fixed rollers 12 and 14, which are mounted axially parallel to each other but perpendicularly on a disk 16, which can be rotated by a stepper motor "M'. The paper web 20 is wrapped around the rollers 12 and 14 as shown. The paper path length increases as the disc 16 is rotated.

Fig. 2 shows another example, using three rollers 32,34, 36.

232 XEROX DISCLOSURE JOURNAL - Vol. 24 No. 5 September/October 1999

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DUAL OR TRI-ROLLER ROTARY SPEED CONTROLLER (Cont'd)

Fig. 3 shows the system of Fig. 1 applied both upstream and downstream in the schematic view of a web printing system.

Programmed rotation of these dual roller or tri-roller devices, placed both before and after the photoreceptor...