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Topic: Benefits of LaVezzi VKF sprockets?
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Will Kutler
Phenomenal Film Handler
Posts: 1506
From: Tucson, AZ, USA
Registered: Feb 2001
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posted 08-21-2003 04:07 PM
As quoted form the LaVezzi catalog
"Whether driving film, perforated lead frames or in TAB applications, protecting perforations against premature failure is often critical. Thus the form and finish of the VKF (Very Kind To Film) sprocket has been designed to reduce damage to the perforation.
The VKF tooth has a maximun width across the flat driving face to minimize the stress on the perforation face. the corners of the teeth have been radiused to clear the perforation radii. This eliminates the potential for damage when lateral motion causes the perforations to slide over a relatively square standard tooth corner."
"The finish of the VKF tooth form has been enhanced using the Radii-Blend TM process. With this procedure, every intersecting tooth edge, both at the sides and the top, is blended and burnished to offer a polished surface. This insures a smooth engagement and disengagement of the perforated edge with the tooth surface."
"Although the stock VKF design was origonally intended for materials perforated per ANSI-SMPTE 102-1991 or 139-1986, the process may be applied to other tooth forms. Super 16 and 35 , as well as 70mm tooth shapes, have been improved using this procedure. Contact LaVezzi for information on variations of other similar applications."
On a side note, I do believe that LaVezzi VKF sprockets are less prone to "hooking". Today, VKF sprockets are almost standard equipment. I do believe that VKF sprockets can be adapted to older projector intermittents such as the Simplex Super and E-7, but applications should be checked with LaVezzi, as they do have the application information/charts.
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