Paper "Skidding" (Continued)
By John Grant
Hi Robbie and Jody,
Here is a retransmit (at Robbie's request) which may have been incomplete. Enjoyed your message(s) Robbie, I too get a little "punchy" in the early morning hours!
BTW, in the absence of any statement in the service manual about the brake's purpose being to maintain constant paper tension, I'm going to go out on a limb and say I don't think that is it's purpose. That would *seem* logical, but I believe it's real purpose is simply to avoid the skidding problem. The service manual says (quote) "It is for the purpose of holding back the note sheet so it will wind tightly on the take-up spool." (unquote), an oversimplified statement IMHO. It doesn't say that this is accomplished by maintaining constant paper tension, and in fact, I believe that constant tension (if it could be achieved) would tend to make the problem worse. The way to make this work is to have a DECREASING tension curve as the roll plays and this is exactly the way the needle valve/pneumatic/brake band work. Whether this was the intended engineering result or a lucky experiment that worked is a matter of conjecture.
"Make mine a Millers" -JRG
[ Editor's Note: It would appear that some private correspondence
[ took place between John Grant and Robbie Rhodes this weekend, and that
[ Robbie "lost the bet". It appears that Robbie's buying the beer... Jody
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"Every creative act results from a sudden cessation of stupidity."
-Edwin H. Land, inventor of the Polaroid Land Camera
"Help stamp out and eliminate superfluous redundancy." -Genius
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(Message sent Mon 22 Jan 1996, 16:17:50 GMT, from time zone GMT-0800.) |
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