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Browse Prior Art Database

Print Paper Escapement Incrementer

IP.com Disclosure Number: IPCOM000047721D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 3 page(s) / 70K

Publishing Venue

IBM

Related People

Reed, AR: AUTHOR

Abstract

This article addresses a typical problem in journal paper printers of the type that employ a supply roll and a take-up roll to log transactions in a supermarket or point-of-sale terminal printer. Chief among these problems is that as the take-up roll diameter increases, if the take-up roll is incremented by a fixed amount, the line-to-line spacing on the resulting printed form increases. While a variety of sophisticated mechanisms exist utilizing feedback from the supply or take-up roll diameters to vary the mechanical or electromechanical drive increment, these may be unnecessarily expensive and/or complicated. Fig. 1 illustrates in cross-sectional view the schematic layout of a printer drive for a reel-to-reel paper supply and take-up that uses a Geneva escapement mechanism to allow equal increments of paper feed.

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Print Paper Escapement Incrementer

This article addresses a typical problem in journal paper printers of the type that employ a supply roll and a take-up roll to log transactions in a supermarket or point-of-sale terminal printer. Chief among these problems is that as the take-up roll diameter increases, if the take-up roll is incremented by a fixed amount, the line-to-line spacing on the resulting printed form increases. While a variety of sophisticated mechanisms exist utilizing feedback from the supply or take-up roll diameters to vary the mechanical or electromechanical drive increment, these may be unnecessarily expensive and/or complicated. Fig. 1 illustrates in cross- sectional view the schematic layout of a printer drive for a reel-to-reel paper supply and take-up that uses a Geneva escapement mechanism to allow equal increments of paper feed. A supply roll 14 and a take-up roll 15 are shown. Take-up roll 15 may be continuously driven through a pulley 19, driven by pulley 18 and belt 17 powered by motor 16, as shown. One of the pulleys 18 and 19 may have a one-way torque limiting clutch or friction clutch that will slip at a given tension when installed. By this means, the motor 16 may be continuously energized and the pulley 19 continuously driven to maintain tension on the paper
13. However, paper 13 may be held taut between the feed wheels 11 and 12 with feed wheel 1 locked in position or released incrementally by the Geneva mechanism consisting of lobes 7 on an escapement wheel that operates with a slotted escapement arm and latch 2 and 3, the operation of which will be described below. Print head 21 and platen 20 are shown schematically in an appropriate position in the paper path. When it is time to index the paper 13 to begin a new line of print, electromagnet 6 will be pulsed to release the escapement disc 2 and allow the escapement lobes 7 to increment to the next lobe. When lobe 7 engages the cutout in the escapement mechanism 2, arm 3 will move upward, closing switch 4 and turning off the Geneva wheel drive. Any number of lobes 7 may be positioned on Geneva wheel 1 at equally spaced increments to allow even incrementation of paper 13 regardless of the take-up or supply roll diameters. Fig. 2A illustrates an enlarged view of the Geneva incrementing wheel 1 with lobes 7 havi...