Advancing material of indeterminate length – Processes
Patent
1996-05-22
1998-09-22
Bonck, Rodney H.
Advancing material of indeterminate length
Processes
226 45, 226100, B65H 1600, B23Q 1500
Patent
active
058102353
ABSTRACT:
A method for detecting disruptions in the transport of a web in a rotary printing press. A speed evaluation is performed on the web and then analyzed, including a comparison of a contactless measurement of the instantaneous speed (VPAP(t)) of the web with a speed selected from the group of speeds of the web consisting of: 1. a virtual speed (VVIRT(t) which is evaluated from the mechanical speed of the press, 2. an average speed (VAVE(t)) measured during a time before the last measurement, and 3. a speed (VPAP (t.sub.k-1)) measured at the moment immediately before the moment when an instantaneous speed (VPAP(t.sub.k)) is measured. The analysis is performed to obtain a respective speed difference, and to compare the respective speed difference with a respective prescribed threshold value. If the speed difference is not within the threshold value, a signal is generated which indicates that the web is not traveling at the proper speed.
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"Principles and Development of Spatial Filtering Velocimetry" (Asakura), Applied Physics B 43, 1987, pp. 209-224.
Blanchard Alain
Hoynant Pierre
Bonck Rodney H.
Greenberg Laurence A.
Heidelberg Harris SA
Heidelberger Druckmaschinen AG
Kaness Matthew A.
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