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Author
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Topic: Simplex Pad Roller Arms Popping Open
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Monte L Fullmer
Film God
![](http://www.film-tech.com/ubbmembers/2797c.jpg)
Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 01-30-2005 07:54 PM
quote: Richard Hamilton Which model projector?
Hopefully, he's talking about the middle constant speed sprocket pad roller assembly on from the XL's to Apogees-being that this sprocket unit is after the intermittent sprocket.
Sounds like the pin that the closure spring behind the arm is getting ready to bust. This is one of the design flaws of Simplex with that pad roller arm assembly for the middle constant speed sprocket. When that pin breaks, the closure spring will might stay there, but loses the spring tension greatly, and then the spring will come off all together, meaning that the pad roller arm will have to be replaced.
I've replaced a good dozen of these arms due to that pin behind breaking.
Why this pin breaks is that it's also the stop pin for the roller arm,which hits against the sprocket boss assembly and this pin eventally gets bent back and will snap without notice.
Another possibility is that the fibre gear on the other end of this middle constant speed sprocket is somewhat worn, stripped, or the vertical shaft (for XL's) is out of alignment, causing the teeth mesh between metal and fibre gears be somewhat loose, and during the run could cause the lower loop to collapse.
This could be from a bad brainwrap with "poly" film, or something to immediately seize the machine.
And lastly, this assembly could be just loose on the mainframe. Check those 9/64th allen screws that hold the assembly to the mainframe for tightness. For if these are loose, the assembly isn't square to the drive sprocket attached to the vertical shaft,causing the gear mesh slippage.
-Monte [ 01-31-2005, 04:10 AM: Message edited by: Monte L Fullmer ]
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