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Author Topic: GS1200 Lower Loop
Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003


 - posted June 03, 2013 09:03 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Can someone explain to me how the GS1200 sets the lower loop size right after the threading guides are retracted? I can see how the machine intially threads itself when the auto thread guides are set into place, but exactly what happens once the guides are sprung out by the solenoids? What exactly goes on to set the size of that lower loop, and is there any way to adjust it to get,say, a larger or smaller lower loop? The Eumigs, and other projectors, have totally enclosed threading guides which "lock in" the size of that lower loop, but the Elmo has nothing between the bottom of the gate and the sound head to fix that lower loop. What goes on here?

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Maurizio Di Cintio
Jedi Master Film Handler

Posts: 977
From: Ortona, Italy
Registered: Jan 2004


 - posted June 03, 2013 11:10 AM      Profile for Maurizio Di Cintio     Send New Private Message       Edit/Delete Post 
The extra, smaller pinch roller (the one placed right before the sound heads) takes care of this task: it's lifted during auto thread, but as soon as the machine is switched to FWD projection, the roller is lowered (along with the mag pressers or even without them if opt playback is required). This causes the lower loop to get its correct shape (facing both inwards and outwards, depending on machine series). As for what you mentioned in another topic, I don't think this might account for the problem you are experiencing with OPT playback...
Hope this helps.

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Maurizio

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