Method and device for the control and regulation o

专利名称：Method and device for the control and

regulation of the stretch of a running web

发明人：Bengt Andreasson申请号：US08/074859申请日：19930610公开号：US085386A公开日：19960116

摘要：A method and an apparatus provided to calculate and control the elongation ina running web (16), e.g. in connection with a preparation of a web in a printing machine. Inconnection with at least an increase or decrease in the web tension, the length change ina reference length of the web material is measured, and by means of web tension metersthe web tension before and after the web tension change (&sgr;.sub.1 -. sigma..sub.2) oreach one of the web tension alterations is determined. The tension-free length (n.sub.o)of the reference length is also calculated and if it is needed, the elongation of the web iscorrected through an increase or a decrease in the web tension depending on saidmeasurements.

申请人：ANDREASSON; BENGT

代理机构：Griffin, Butler, Whisenhunt & Kurtossy

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