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AssigneeKleinewefers GmbH
InventorsJosef Pav, Wimmar Schmitz, Reinhard Wenzel
Life of this patent
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Abstract
A system of rolls for use in a calender, printer or rolling mill has a pair of rolls at least one of which has a hollow cylindrical shell with an elastically deformable line. The shell surrounds a stationary carrier and confines a row of electromagnetic or hydraulic force applying devices which can be adjusted individually to thereby regulate the pressure between the two rolls and hence the temperature at the exterior of the liner. Such temperature is monitored by one or more sensors, and the signals from such sensors are processed by a computer which regulates an adjusting unit for the force applying devices so that the pattern of temperatures along the external surface of the liner matches an optimum pattern.
Claims31
In a machine for treating running webs or the like, particularly in a calender for treating sheets of paper and the like, a system comprising a first roll;
- a second roll including a hollow at least partly elastic rotary shell defining with the first roll an elongated nip, a carrier spacedly surrounded by said shell, and supporting means interposed between said shell and said carrier and including a plurality of adjustable force applying devices distributed in said shell in the longitudinal direction of said nip and arranged to apply forces against the respective portions of said shell to thereby influence the temperature of such portions, each of said rolls having an external surface and at least that portion of one of said rolls which is adjacent to the respective external surface consisting of a viscoelastic material;
- means for ascertaining the temperatures of at least some of said portions and for generating signals denoting the ascertained temperatures;
- means for comparing said signals with reference values denoting the desired temperatures of said portions;
- means for adjusting said force applying devices when the ascertained temperatures of the respective portions of said shell deviate form the corresponding reference values, said comparing means comprising means for evaluating said signals and for transitting to said adjusting means second signals when the signals furnished by said ascertaining means deviate from said reference values;
- and means for transmitting to said evaluating means additional signals denoting at least one variable parameter of the running web which influences the temperature of said shell, said evaluating means being operative to modify said second signals as a function of the characteristics of such additional signals.
In a machine for treating running webs or the like, particulary in a calender for treating sheets of paper and the like, a system comprising a first roll;
- a second roll including a hollow at least partly elastic rotary shell defining with the first roll an elongated nip, a carrier spacedly surrounded by said shell, and supporting means interposed between said shell and said carrier and including a plurality of adjustable force applying devices distributed in said shell in the longitudinal direction of said nip and arranged to apply forces against the respective portions of said shell to thereby influence the temperature of such portions, said shell being subject to deformation transversely of said nip;
- means for ascertaining the temperatures of at least some of said portions and for generating signals denoting the ascertained temperatures;
- means for comparing said signals with reference signals denoting the desired temperatures of said portions;
- means for adjusting said force applying devices when the ascertained temperatures of the respective portions of said shell deviate from the corresponding reference values, said comparing means comprising means for evaluating said signals and for transmitting to said adjusting means second signals when the signals furnished by said ascertaining means deviate from said reference values;
- and means for transmitting to said evaluating means additional signals denoting at least one variable parameter which influences the temperature of said shell, said evaluating means being operative to modify said second signals as a function of the characteristics of such additional signals, said means for transmitting additional signals including means for monitoring the extent of deformation of said shell in a direction transversely of said nip and for transmitting corresponding additional signals to said evaluating means.
Dependencies are inferred from the claim text.