Browse Prior Art Database

Incremental Web Motion Control

IP.com Disclosure Number: IPCOM000074570D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Spychalla, KT: AUTHOR [+3]

Abstract

Rapidly incrementally transporting webs using high-response motors can create cumulative position errors. Use of stepping motors with limited response times may provide precision, but are limited to low velocities during long moves. For many web-transporting situations, such as paper motion in a line printer, fast response and noncumulative errors are required.

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Incremental Web Motion Control

Rapidly incrementally transporting webs using high-response motors can create cumulative position errors. Use of stepping motors with limited response times may provide precision, but are limited to low velocities during long moves. For many web-transporting situations, such as paper motion in a line printer, fast response and noncumulative errors are required.

A DC motor is precisely controlled for effecting incremental motions coupled with high-speed long-web transport steps without cumulative errors. Register 1 receives step size over cable 1A and transfers the step size to counter 2 under a "GO" command signal. Step size may be added to any residual error in counter 2 for correcting errors in web transport.

Counter 2 supplies signals to digital-to-analog converter 3 for controlling amplifier and analog compensation network 4. Network 4 supplies its signal directly to motor 5. Motor 5, directly coupled to carriage 6, responds to network 4 signal for transporting the web. Tachometer 7 supplies incremental position indicating pulses to direction detector 8 and over line 9 for incrementing or decrementing counter 2 in accordance with the motion of motor 5.

Utilization of digital logic in metering web transport and the ability to adjust the step size in register 1 enables precise movements of a paper web while permitting high-speed long steps.

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