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Report of Standards Committee
25
that the fihn is moved forward by the entering tooth, the fihn being of normal shrinkage, approximately 0.13%. This condition of the film being moved forward by the entering tooth will be maintained until the film has shrunk 0.78% which is the normal pitch of the sprocket and theoretically four teeth will engage the edge of the perforations, but with additional shrinkage of the film the condition will change so that film is moved forward by the leaving tooth "B" which will continue until the film has shrunk 2.89% which will be the maximum shrinkage film can have and run on this sprocket
eCPeC5CNT3 A CONDITION with NCWLV DCVCLOPZD riLM WITH NOeMAL SMQIN^AOC ABOUT .13% I^UNNINS ON SPeOCKZTS WITH DIMCN5I0NS A5 PBOPOSCD AT P/iSIS CONFCBCNCt
INTrSMnrCNT
TAKH-UP
7a%5Meur^^
269% S°^ieuf^K
zmo
.7a%^MB<JNK
.laXSneuNK SHOWN 1
TENSION o' WIND-UP
055 TOOTH THICXNCS5 t
Fig. 5.
without interference on the entering tooth. What we want to avoid is the film being fed forward by the entering tooth and with this design of sprocket this condition will exist until film has shrunk 0.78%, so that the range of good running condition is between a shrinkage of 0.78%, and 2.89%.
Referring to the takeup sprocket you will note that the film is held against the rewind tension by the leaving tooth "D" and there is clearance at the entering tooth "C", this being a good running condition and one that will be maintained until the film has shrunk to 0.78%. After film has shrunk in excess of 0.78% the film will be held against the entering tooth "C". What we want to avoid is film being held against the rewind tension by the entering tooth.