Re: Paper "skidding" (digest 960122)
By Robbie Rhodes
Yep, I owe John Grant a few "Miller's" for losing a hasty wager!
Whether or not the system was really intended to maintain constant tension of the roll might be explained in the transcribed diaries and recollections of Dr. Clarence Hickman, who developed the Ampico B. I believe AMICA has now published these papers -- can someone check for us? I heartily agree that the purpose is to alleviate "skidding".
I just measured a jumbo roll I mounted on a Klavier (now Keystone) core. The diameter of the roll on the supply spool is 3.25 inches; the outside diameter of the core is 0.86 inches. If a simple "pressure pad" brake (constant torque) were employed, the tension of the paper would vary more than 4.3 to 1. I don't think 10-tune music rolls have a problem like this, because orchestrions use a large diameter core.
(Gosh... Remember the problems we had with cheap 7-inch reel-to-reel tape recorders? And they had very little friction at the "reader head"!)
-- Robbie Rhodes
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(Message sent Tue 23 Jan 1996, 06:53:17 GMT, from time zone GMT-0800.) |
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