my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Simplex Intermittent Pad Shoe q.

Author Topic: Simplex Intermittent Pad Shoe q. Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 08-31-2003 11:58 PM                     It appears like the same item, although with different part numbers. Known as S-1511 on the Standard and Super Simplex, R-316-E on the E-7's, P-3291 on the 1060's, this outer intermittent pad shoe has the same purpose on all machines. It, coupled with an inner pad shoe (one set for each for each side of the sprocket) holds the film onto the intermittent sprocket. At first the outer shoe appears to be symmetrical, but on closer examination, one notices that one of the ends has a definite "point" to it. All manuals show this point to be on the "outgoing" side of the sprocket (furthest away from the gate). Obviously, this gives a better purchase at this point on the sprocket. My question is, why is this not symetrical? I am not finding all of our machines the same in this respect. [ 09-01-2003, 12:00 AM: Message edited by: Rick Long ]  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 09-01-2003 12:26 AM                     I think that is because it will allow the film to release itself from the sprocket teeth a little easier. Just a guess....  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 09-01-2003 09:13 AM                     The dynamics of the film entering and leaving the sprocket are not the same. The pointy side provides a greater wrap, as you noted, it also helps push the film back to form the lower loop and finally, it keeps the film off of the the support tang for the intermittent shoe. I'd be willing to wager it was the last reason that it was orginally formed with a pointy side. Conversely, you don't want the shoe to have any affect on the film entering the sprocket..just to hold it to the sprocket. Any force to the film between the gate and intermittent sprocket will show up as vertical instability unless it is held rigid (the shoe is held by a spring...not ridgid). Some projectors actually frame by pushing against the film as it leaves the gate! Steve  |  IP: Logged Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 09-01-2003 07:32 PM                     Excellent analysis, thank you Steve and Paul.  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.