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US 4,004,510 AGranted
Equipment for introduction of a strip of paper, cardboard or similar material into a printing machine
AssigneeJ. Bobst & Fils, S.A.
InventorRoger Roch
Life of this patent
Estimating the term…
Abstract
In a printing machine, a device for introducing a continuous web of paper to the printing station, the device having apparatus to continually measure the coefficient of elasticity of the web and apparatus for developing a tension on the web as a function of the measured coefficient of elasticity. The web is fed against two tension measuring devices in conjunction with two traction rollers having slightly different radii from which the coefficient of elasticity can be calculated electronically.
Claims7
In an apparatus for feeding a web of material to a printing machine:
- means for continually measuring the coefficient of elasticity of the web and for generating an electrical signal output in response thereto, said continually measuring means comprising means for determining an elongation of the web under given tension conditions, means for sensing said given tension conditions, calculator means for utilizing said determined elongation and said sensed tension to produce a signal which is continually indicative of the coefficient of elasticity of said web;
- means for utilizing said electrical signal response for developing a tension value signal;
- electrical-mechanical tensioning means operatively coupled to said web;
- and means for applying said tension value signal to said electrical-mechanical tensioning means for regulating the tension on the web in response to said coefficient of elasticity.
1 more element
Dependencies are inferred from the claim text.