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TOPIC: projector making film bounce

projector making film bounce 05 Nov 2004 23:23 #21993

  • puzzlegut
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We have been having problems with one of our projectors. For some reason, it makes our films bounce. There was even one time when the projector was causing our framing knob turn while the movie was running and causing the film to go out of line. That problem was fixed but the film will still bounce. It doesn't do it during the entire movie. The movie will be working fine for awhile and then it might bounce for a bit and then it'll be fine again. Does anyone know what might be wrong?
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Re: projector making film bounce 05 Nov 2004 23:56 #21994

  • leeler
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I'm still new at this but I seem to remember the tech who installed my equipment telling me about a control knob or set screw for the intermittent gate that needed to be adjusted occassionally to get the film to stop jumping. Check your projector documentation for a set screw on the gate and "fiddle" with it. See if that doesn't help. Good luck!
"What a crazy business"
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Re: projector making film bounce 06 Nov 2004 00:25 #21995

  • outaframe
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First place to check would be the tension shoes in the film gate (the part that opens just behind the lens holder)... Dirty or "waxy" buildup on the shoes, weakened or broken tension springs, malformed film gate will all cause this problem... Since the problem is intermittent, suggests that minor variations in film thickness may trigger the problem to come and go, and reinforces the problem being with the tension shoes...
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Re: projector making film bounce 06 Nov 2004 09:30 #21996

  • Ken Layton
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It would also be helpful to know the make and model of your projector.
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Re: projector making film bounce 07 Nov 2004 04:24 #21997

  • Dominic
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I would start with the preassure straps on your film trap. Also check that your intermittent shoe is closing properly.
Do splices seem to cause it or does it just happen?
Also check that your lens is tight. We had a horrible wobble a while back just because the lens collar was loose.
I'd also check your shutter as well, an out of ballance shutter could cause the entire projector to shake horizontally.
Give us your make and model projector and see if you can't describe the problem in greater detail.
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Re: projector making film bounce 09 Nov 2004 14:38 #21998

  • puzzlegut
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It's a Simplex. Hopefully that helps since I'm not well knowledgable in the projector department.

We ordered a part that we beleive is causing the problem and hopefully it will fix it.
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Re: projector making film bounce 10 Nov 2004 10:46 #21999

  • Mudbrother
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I would check what these other guys have mentioned first, but we had a similar problem on a Simplex XL, and it was caused by a faulty compensator I believe. It was a bit beyond my ability to repair, I had our tech fix this one.

Rance
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Re: projector making film bounce 11 Nov 2004 11:52 #22000

  • John Pytlak
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You first need to determine if the unsteadiness is in your projector, or perhaps in the print itself.

Pull out the aperture plate, and you may be able to see the corners of the perforations on the print film itself. If they are "rock steady", your projector is doing its job. If not, gate/shoe tension and alignment are the two things that are easy to check and fix. It could also be a worn intermittent movement, or perhaps a worn intermittent sprocket. With the intermittent in the "locked" position, is there any "play" or looseness in the sprocket? --- There shouldn't be.

John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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