A New Demand-Drive System for Processing Machines Using Spring-Centered Spools

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A new processing machine spool is a basic part of a simple, reliable demand-drive system with an output pacer that can provide uniform and controllable tension throughout the machine. The spool has a rigid rim, a centrally disposed hub around which the spool rotates, and flexible spring-like members connecting the rim portion to the hub. The spools are mounted on a stationary shaft around which they are free to rotate. A drive roller on each rack provides a small percent of overdrive compared to the pacer. As film is demanded by the pacer, the rims of the spools are pulled into contact with the overdriven drive roller; when the demand for film is satisfied, the integral springs pull the spools out of contact with the drive roller. A resilient covering on the drive roller and serrated rims on the spring spools permit the driving force required for control of tension in the machine. An equilibrium position obtains in operation, with only small variations in speed. Film-transport speed is uniform and at equilibrium shows good regulation and no drift.
Publication Date: 1969-09-01
DOI: 10.5594/J10811
Link: https://doi.org/10.5594/J10811
Author(s): Carl A. Feichtinger, Lawrence R. Witherow

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Carl A. Feichtinger and Lawrence R. Witherow; A New Demand-Drive System for Processing Machines Using Spring-Centered Spools, Journal of the SMPTE ( Volume: 78, Issue: 9, September 1969); SMPTE, 1969. Available at https://doi.org/10.5594/J10811

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Carl A. Feichtinger and Lawrence R. Witherow; A New Demand-Drive System for Processing Machines Using Spring-Centered Spools, Journal of the SMPTE ( Volume: 78, Issue: 9, September 1969); SMPTE, 1969. Available at https://doi.org/10.5594/J10811

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<span class="citation">Carl A. Feichtinger and Lawrence R. Witherow; <cite>A New Demand-Drive System for Processing Machines Using Spring-Centered Spools</cite>, Journal of the SMPTE ( Volume: 78, Issue: 9, September 1969); SMPTE, 1969. Available at <a href="https://doi.org/10.5594/J10811" target="_blank" rel="noopener">https://doi.org/10.5594/J10811</a></span>

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<li>
Carl A. Feichtinger and Lawrence R. Witherow; <cite id="bib-10-5594-j10811">A New Demand-Drive System for Processing Machines Using Spring-Centered Spools</cite>, Journal of the SMPTE ( Volume: 78, Issue: 9, September 1969); SMPTE, 1969
<span class="doi">10.5594/J10811</span>
</li>