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Topic: Century JJ shutter assembly variations

Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 10-16-2005 05:24 PM

Yeah, there is another one kicking around.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 10-17-2005 07:57 PM

quote: Brad Miller
I wonder, was there ever a high speed intermittent made for the JJ?

No, but the Cinemascope 55 machines had movements that were slightly accelerated but not to the extent of the X-L movement. The cam pin was mounted to a sliding dovetail which was part of the cam. The dovetail was moved by a roller underneath the cam that ran in a machined groove...... As the cam went around the dovetail moved slightly. Remember that the CS 55 frames were pretty tall! I gave one of these movements to the Chicago Cinema Museum quite a few years ago, so there is still one of this type around in existance. They would probably let you examine it if you're ever in Chicago.

Mark

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 10-17-2005 08:56 PM

If anyone wants to license the "Quickermittent" design from Kodak, I'll put you in touch with the right people. Up to a 27% faster index time (more light efficiency) with no extra parts, just a redesigned profile for the starwheel slots.

Kodak "Quickermittent" Patent PN/6,183,087

quote:
United States Patent 6,183,087
Kirkpatrick , et al. February 6, 2001
Geneva mechanism and motion picture projector using same

Abstract

A driving mechanism such as a Geneva Mechanism which allows a load, such as film in a motion picture projector, to be intermittently advanced with controlled acceleration. The Geneva Mechanism includes a star wheel and a rotating driver. The star wheel includes slots and is operationally associated with the load. The rotating driver includes a drive pin which cooperates with the slots to cause an intermittent rotation of the star wheel. Either the slots or the drive pin is shaped in a controlled manner to permit optimum acceleration and deceleration of the star wheel.
Inventors: Kirkpatrick; David H. (Rochester, NY); Kurtz; Andrew F. (Rochester, NY)
Assignee: Eastman Kodak Company (Rochester, NY)
Appl. No.: 329841
Filed: June 11, 1999

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