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Transfer of a flexible web member from supply reel to a take-up reel

  • US RE30,939 E
  • Filed: 01/31/1980
  • Issued: 05/18/1982
  • Est. Priority Date: 07/05/1976
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the transfer of a web from reel to reel of a web/reel assembly, in apparatus having means generating signals representing respectively the rotational speeds of the reels, said method comprising the steps of:

  • storing in memory electrical signals representing constants uniquely characterizing said reel/web assembly and derived from the physical parameters thereof, which constants when used in web position determination algorithms with the ratio of rotational speeds of the reels measured anywhere along the length of the web provides absolute values of web position,periodically measuring the ratio between the rotational speeds of said reels based on said rotational speed signals from said generating means,deriving from said memory signals representing the constants for said reel/web assembly,determining absolute values of successive web positions using said web position position algorithms with said constants and said periodic measurements of reel speed ration, andmonitoring the transfer of the web in said apparatus according to said absolute values of successive web positions.

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