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The sound drum rubber pinch roller is mounted
on the #4 film guide (or pinch roller bracket
3'12.',79911 *hich direccs rhe film up and oyer
the sound drum in the self-thread operation.
This is accomplished by the interlocking bracket
312-17091 wfrich depresses pin 312-17361,
raising the rubber pinch roller away from the
sound drum. When the self-thread mechanisrn is
released, the rubber pinch roller rests firmly
against the sound drum.
It is important that the rubber pinch roller be
kept clean and that it rotates freely on the shaft.
Remove the roller to clean and lubricate.
lf the roller does not turn freely, it may restrict
the film from advancing over the sound drum
during self-threading. A dirty or resrricted roller
may also contribute to excess wow & ffutter.
To adjust the tensions of the pinch roller, push
the #2 film guide to self-thread position.
a. lnsert twc layers of 16mm film between the
shoulders of the rubber pinch rollcr and lamp
house casting.
b- Locate pin 3f2-17361 so that it touches the
bottom edge of the interlocking brackrt.
c. While pressing the rubber pinch roller toward
the casting twith filrn between the roller
shoulders and casting), tighten the screw that
holds the pin bracket to the rsbber roller
shaft-
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TilTERLSCKING
BEASKCT
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312-t?gSt
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6. Tension Guide And Roller Assembly
Fis' #gE
TEITISION.
GUIDE
& ROLLEFS
The tensian guide and roiler assembly provides
the dampening required between the #2 sprocket,
drive and the sound drum. When the guide rides
midway between its limits, wow and flutter is
minimized. During the self-thread operation, the
tension guide {4I} provides a path for the fitm
totravelfromthesound drum to the#Z sprocket
drive-
Fis. #96
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sFRllre
sT.lt-ir
ABM
sT-r7tgl
GUIDE ROLLER
ttz-t #?
Flil
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fd'i'?tit
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S0lrlrD DRuffl
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