A Two-Speed Drive for Continuous Motion-Picture Printers

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: In this two-speed drive, adapted to a Bell & Howell Printer, Model D, two motors running continuously drive the fields of two electric clutches in the same direction, one at approximately twice the speed of the other. The armatures of the clutches are on the same shaft and are splined to the hub of a third pulley that drives the printer. An electrical circuit triggered by a cuing system activates one clutch or the other to change the speed of the printer within a short enough interval so that there is no loss in projection quality of the print. Such a speed changer permits optimum productivity on a printer using negatives containing scenes of widely varying densities.
Publication Date: 1959-01-01
DOI: 10.5594/J13854
Link: https://doi.org/10.5594/J13854
Author(s): John J. Graham, Howard F. Ott

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John J. Graham and Howard F. Ott; A Two-Speed Drive for Continuous Motion-Picture Printers, Journal of the SMPTE ( Volume: 68, Issue: 1, January 1959); SMPTE, 1959. Available at https://doi.org/10.5594/J13854

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John J. Graham and Howard F. Ott; A Two-Speed Drive for Continuous Motion-Picture Printers, Journal of the SMPTE ( Volume: 68, Issue: 1, January 1959); SMPTE, 1959. Available at https://doi.org/10.5594/J13854

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<span class="citation">John J. Graham and Howard F. Ott; <cite>A Two-Speed Drive for Continuous Motion-Picture Printers</cite>, Journal of the SMPTE ( Volume: 68, Issue: 1, January 1959); SMPTE, 1959. Available at <a href="https://doi.org/10.5594/J13854" target="_blank" rel="noopener">https://doi.org/10.5594/J13854</a></span>

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John J. Graham and Howard F. Ott; A Two-Speed Drive for Continuous Motion-Picture Printers, Journal of the SMPTE ( Volume: 68, Issue: 1, January 1959); SMPTE, 1959
doi: 10.5594/J13854
url: https://doi.org/10.5594/J13854

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John J. Graham and Howard F. Ott; <cite id="bib-10-5594-j13854">A Two-Speed Drive for Continuous Motion-Picture Printers</cite>, Journal of the SMPTE ( Volume: 68, Issue: 1, January 1959); SMPTE, 1959
<span class="doi">10.5594/J13854</span>
</li>