A New Sprocket for Theatrical 35mm Projection Equipment, Designed to Limit Film Damage

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: An answer to the problem of premature film damage in theatrical exhibitions is found in a new sprocket-tooth shape. Torn film often occurs when heavy film tension causes the sprocket tooth to deform the driven edge of the perforation. Lateral film movement causes the tooth to cut into the perforation corners. A redesign of the projector sprocket must take into consideration the importance of handling films with CS perforations as well as the standard KS perforation. The new VKF (Very-Kind-to-Film) sprocket design follows standard center-to-center dimensions, but involves an increase in overall tooth width and adds a radius at all tooth corners so that no sharp edges can contact the perforation, and there is no opportunity for the tooth to contact the corners of the perforation. The design will accommodate either KS or CS perforations. The VKF sprocket is an attempt to make the possibility of film damage less likely, to reduce wasteful film loss, to limit the time spent on film repair, and to make screen presentation more pleasing to the patron.
Publication Date: 1979-02-01
DOI: 10.5594/J10446
Link: https://doi.org/10.5594/J10446
Author(s): Worth Baird

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Worth Baird; A New Sprocket for Theatrical 35mm Projection Equipment, Designed to Limit Film Damage, SMPTE Journal ( Volume: 88, Issue: 2, February 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J10446

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Worth Baird; A New Sprocket for Theatrical 35mm Projection Equipment, Designed to Limit Film Damage, SMPTE Journal ( Volume: 88, Issue: 2, February 1979); SMPTE, 1979. Available at https://doi.org/10.5594/J10446

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<span class="citation">Worth Baird; <cite>A New Sprocket for Theatrical 35mm Projection Equipment, Designed to Limit Film Damage</cite>, SMPTE Journal ( Volume: 88, Issue: 2, February 1979); SMPTE, 1979. Available at <a href="https://doi.org/10.5594/J10446" target="_blank" rel="noopener">https://doi.org/10.5594/J10446</a></span>

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Worth Baird; A New Sprocket for Theatrical 35mm Projection Equipment, Designed to Limit Film Damage, SMPTE Journal ( Volume: 88, Issue: 2, February 1979); SMPTE, 1979
doi: 10.5594/J10446
url: https://doi.org/10.5594/J10446

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<li>
Worth Baird; <cite id="bib-10-5594-j10446">A New Sprocket for Theatrical 35mm Projection Equipment, Designed to Limit Film Damage</cite>, SMPTE Journal ( Volume: 88, Issue: 2, February 1979); SMPTE, 1979
<span class="doi">10.5594/J10446</span>
</li>