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US 5,289,766 AGranted
Apparatus for cooling calender rolls and the like
AssigneeKleinewefers GmbH
InventorsHans-Rolf Conrad, Jurgen Baumeister
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AssigneeKleinewefers GmbH
InventorsHans-Rolf Conrad, Jurgen Baumeister
Estimating the term…
Apparatus for cooling the end portions of a calender roll which has an elastic layer adjacent its peripheral surface and wherein the central portion of the peripheral surface is overlapped by a running web of paper or other material when the calender is in use. The width of the non-overlapped portions of the peripheral surface of the roll varies when a web having a first width is followed by a web having a different second width. This could lead to damage to the roll at the non-overlapped portions of the peripheral surface as a result of overheating by an adjacent rotary component of the calender. The end portions of the roll are cooled by discrete adjustable cooling devices which are movable along the respective non-overlapped portions of the peripheral surface in parallelism with the axis of the roll and each of which shares movements with a monitoring device which is to be maintained in a selected position relative to the adjacent marginal portion of a running web. To this end, the monitoring devices transmit signals to discrete reversible motors which move the monitoring devices along the respective non-overlapped portions of the peripheral surface and are brought to a halt when the monitoring devices assume their selected positions.
In a machine wherein running webs having pairs of longitudinally extending marginal portions and different widths at least partially overlap a peripheral surface extending between two ends of a roll which is rotatable about a predetermined axis and the width of the non-overlapped portion of the peripheral surface at least at one end of the roll varies when a web having a first width is followed by a web having a different second width, apparatus for thermally influencing the roll at the non-overlapped portion of the peripheral surface comprising guide means defining a path extending in substantial parallelism with the axis of the roll;
The apparatus of claim for thermally influencing a roll having an elastic layer adjacent the peripheral surface, wherein said cooling means is disposed between said monitoring means and the one end of the roll as seen in the direction of said axis.
The apparatus of claim wherein said cooling means is adjustable and further comprising means for measuring the temperature of the roll at the non-overlapped portion of the peripheral surface, said temperature measuring means being movable with said cooling means and including means for generating second signals denoting the measured temperature of the roll, and further comprising means for adjusting said cooling means in response to said second signals.
The apparatus of claim wherein said cooling means comprises a plurality of independently activatable and deactivatable cooling units and further comprising means for measuring the temperature of the roll at the non-overlapped portion of the peripheral surface, said temperature measuring means being movable with said cooling means and including means for generating second signals denoting the measured temperature of the roll at the non-overlapped portion of the peripheral surface, and means for adjusting said cooling means in response to said second signals so that the number of activated cooling units is a function of the measured temperature of the roll at the non-overlapped portion of the peripheral surface.
The apparatus of claim wherein said motor is a reversible motor and said output element comprises a feed screw.
The apparatus of claim wherein said moving means comprises a linear motor.
The apparatus of claim wherein said moving means includes means for moving said cooling means and said monitoring means to inoperative positions in which the one end of the roll is located between the peripheral surface and at least one of said cooling and monitoring means.
The apparatus of claim wherein said moving means comprises a support for said monitoring and cooling means and means for moving said support along said path between a plurality of positions including a position in which the one end of the roll is located between said support and the peripheral surface as seen in the axial direction of the roll.
The apparatus of claim wherein said cooling means is adjustable and further comprising means for sensing the temperature of the roll in the region of overlapped portion of the peripheral surface of the roll including means for generating further signals denoting the temperature of the roll in the region of the overlapped portion of the peripheral surface, and means for adjusting said cooling means as a function of variations of said further signals.
Dependencies are inferred from the claim text.