Kleinewefers Gmbh

Kleinwefers Gmbh

Kleinewegers Gmbh

Kleimwefers Gmbh

Ramich Kleinewefers Gmbh

Josef Pav

Reinhard Wenzel

Richard Rauf

Gerhard Hartwich

Peter Svenka

Franz Kayser

Dieter Junk

Hans-Dieter Patermann

Rudolf Vossmerbaumer

Jorg Prey

Hans Bresser

Rolf Van Haag

Wimmar Schmitz

Werner Ehm

Dieter Preuss

Peter J Gaede

H J Lauschner

Klaus Scholl

Heinz Jaegers

Michael Jakel

Rainer Schmidt

Dieter H Muller

Axel Kemna

Rolf Ramisch

Erhard Munch

Hans Weidinger

A roll for use in a calender or a like machine has a carrier which is surrounded by a flexible cylindrical shell. One or more hydrostatic displacing units are installed between the carrier and the shell to deform, when necessary, one or more selected portions of the shell. Each displacing unit has a bearing element with an external surface which is closely adjacent the internal surface of the shell and has one or more pockets for reception of a heated pressurized hydraulic fluid. Each bearing element has a second surface which faces away from the external surface, and the respective displacing unit further comprises one or more plenum chambers adjacent the second surface of the bearing element. The pocket or pockets of the bearing element receive heated fluid from a first source, and the plenum chamber or chambers of the bearing element receive compressed oil or another hydraulic fluid from a second source which can include one or more parts of the first source or vice versa. Each plenum chamber can discharge a stream of oil by way of a flow restrictor to thus prevent stagnation and/or overheating of compressed oil therein. The thus discharged oil can be returned to the source of compressed oil.

Hydrostatic roll for use in calenders

A calender roll wherein a cylindrical shell is rotatably mounted on a stationary carrier by way of bearings which are disposed in the end portions of the shell. The median portion of the shell is heated by a first heating device, and the end portions of the shell are heated by a discrete second heating device. The second heating device has channels which are provided in the end portions of the shell and/or indictive heaters which are adjacent to the exterior of the end portions of the shell. Alternatively or in addition to such expedients, the second heating device can include the bearings in the end portions of the shell; each such bearing includes or constitutes an axial or radial hydrostatic bearing which is heated by hydraulic fluid to thereby heat the respective end portion of the shell. The second heating device ensures that the effective length of the shell approximates or even matches the axial length of the shell.

Heatable roll for use in calenders and the like

A calendar wherein a bottom roll and a deformable top roll flank one or more intermediate rolls is operated in such a way that the shape of the top roll is caused to conform to that of the adjacent intermediate roll before the nip of the top roll with the adjacent roll is narrowed. At least the top roll is heated to enhance the satinizing effect upon paper webs without unduly affecting the specific volume of treated material. It is further proposed to subject the bottom roll to preliminary deformation and/or to heat the bottom roll and/or one or more intermediate rolls.

Calender and method of operating the same

A calender roll wherein a cylindrical shell is rotatably mounted on a stationary carrier by way of bearings which are disposed in the end portions of the shell. The median portion of the shell is heated by a first heating device, and the end portions of the shell are heated by a discrete second heating device. The second heating device has channels which are provided in the end portions of the shell and/or indictive heaters which are adjacent to the exterior of the end portions of the shell. Alternatively or in addition to such expedients, the second heating device can include the bearings in the end portions of the shell; each such bearing includes or constitutes an axial or radical hydrostatic bearing which is heated by hydraulic fluid to thereby heat the respective end portion of the shell. The second heating device ensures that the effective length of the shell approximates or even matches the axial length of the shell.

A roll for use in the system of rolls of a calender has a stationary carrier which is surrounded by a deformable hollow cylindrical shell movable radially relative to the carrier and having end portions which surround and are rotatable relative to rings which are also movable relative to the carrier in the radial direction of the shell. The rings can be arrested in selected positions with reference to the carrier by pairs of hydraulic cylinder and piston units which are connected with the outlets of pumps or with the outlet of a single pump by conduits containing shutoff valves. Refilling devices are provided to compensate for leakage of fluid from the chambers. The shell is deformable by rows of hydrostatic supporting elements which react against the carrier and bear against the internal surface of the shell.

System of rolls for use in calenders and like machines

A pressure roll for use in calenders has a stationary carrier for a shell which is rotatable and movable radially of the carrier. The end portions of the shell surround antifriction bearings which, in turn, surround sleeves capable of moving radially of stubs constituting the end portions of the carrier. The sleeves are pivotally connected to the carrier for oscillatory movement about an axis which is parallel to the axis of the carrier and is angularly offset from one or more hydrostatic or otherwise configurated supporting devices operating between the carrier and the shell to change the radial position of the shell and/or to change the shape of one or more selected portions of the shell. Pivotal mounting of the sleeves on the carrier reduces friction and facilitates accurate adjustment of the radial position of the shell with reference to the carrier.

Pressure roll for use in calenders

The invention is to a roller unit for calenders, planishers or the like, comprising a flex-compensated roller having a roller shell which is hydraulically supported, for the compensation of sags, the roller assembly comprising a mating roller, whereby one of the rollers exhibits a surface engraving, characterized in that the flex-compensated roller is provided with the surface engraving; and in that the surface engraving or, respectively, its carrier is detachably arranged.

Roller unit for calenders, planishers or the like

A system of rolls for use in a calender has an end roll with a fixed carrier and a deformable hollow cylindrical shell surrounding the carrier with freedom of radial movement and defining with a neighboring roll an elongated nip for a running web of paper, textile material or the like. The end roll has a row of primary hydrostatic supporting elements disposed between the carrier and the shell adjacent the nip and a row of secondary hydrostatic supporting elements diametrically opposite the row of primary supporting elements. The bearings between the end portions of the shell and the carrier surround rings which are movable relative to the carrier radially of the shell and can be arrested in selected positions by cylinder and piston units which are connected to a source of pressurized fluid by way of shutoff valves. The areas of those surfaces of at least some primary supporting elements which are adjacent the internal surface of the shell are greater than the corresponding areas of at least some secondary supporting elements. This contributes to a reduction of friction and to a reduction of the temperature of the shell.

Roll calendar system with different size hydrostatic supporting elements

A pressure roll for use in calenders has a fixed carrier for a hollow cylindrical shell which is rotatable about and is movable radially of the carrier. The position of the shell relative to the carrier and the positions of longitudinal increments of the shell relative to each other are regulated by one or more supporting devices each of which has a row of neighboring hydrostatic bearing elements having convex surfaces with pockets adjacent the internal surface of the shell and being urged against the shell by discrete cylinder and piston units, one for each bearing element. Each bearing element has an elongated elliptical or rectangular outline and has a width in the circumferential direction of the shell which greatly exceeds its length in the axial direction of the shell. Each cylinder and piston unit has a piston whose cross-sectional outline equals or approximates that of the respective bearing element and which is only slightly smaller than the respective bearing element. The pistons are mounted on the carrier and extend into complementary cylinder chambers in the adjacent inner sides of the respective bearing elements. The cylinder and piston units can receive a heated hydraulic fluid at a controlled pressure. The relatively wide but short pistons ensure that the bearing elements can stand large deforming stresses.

Pressure roll for use in calenders and the like

A roll for use in a calender has a stationary carrier which is surrounded by a hollow cylindrical shell with the interposition of a hydraulically operated displacing unit which can flex selected portions of the shell when necessary so as to establish a preselected nip between the peripheral surface of the shell and the shell of an adjoining roll. The hydrostatic displacing unit is flanked by two antifriction bearings which operate between the carrier and the shell and are lubricated by a circuit which is independent of the circuit that supplies hydraulic fluid to the displacing unit. This renders it possible to use in the displacing unit a fluid whose temperature is much higher than the maximum permissible temperature of lubricant for the bearings. The bearings are sealed from the respective ends of the displacing unit by single seals or by multiple seals, and any leak fluid which penetrates beyond the neighboring seal is evacuated through one or more channels in the carrier and/or in the shell. Lubricant for the bearings may but need not be identical with hydraulic fluid which is supplied to the displacing unit.

Roll for use in calenders and the like

A roll for use in a calender has a stationary carrier for a hollow cylindrical shell whose end portions are supported by combined radial and axial bearings surrounding annular bearing members which, in turn, surround the end portions of the carrier. The carrier defines with each bearing member a set of chambers which are sealed from the atmosphere and can receive pressurized hydraulic fluid to ensure that the end portions of the shell are biased toward a second roll with a requisite force as well that the end portions of the shell are stabilized against lateral and/or other stray movements. The fluid in the chambers ensures that the shell can be acted upon by large forces without unduly stressing the antifriction bearings. The bearing members flank a hydrostatic bearing unit which acts between the central portion of the shell and the carrier.

A calender roll wherein the flexible shell is supported by a row of primary hydrostatic bearing elements serving to transmit first forces toward the nip of such roll with a second roll and wherein the shell is further acted upon by a row of secondary hydrostatic bearing elements which generate second forces opposing the first forces. The rate of fluid flow through the secondary bearing elements is regulated with a view to conform the temperature of the shell along the nip of the two rolls to a preselected pattern. To this end, the compensator of a computer in the fluid pressure regulating unit insures that pressure changes are distributed among the primary and secondary bearing elements with a view to match each change of the first forces by an equal change of the second forces. The temperature of the fluid is regulated only ahead of the regulating unit. The compensator cooperates with the secondary bearing elements to ensure that the temperature of the shell can be changed along the nip without altering the temperature of the fluid.

A calender wherein a permanently installed main roll cooperates with at least one exchangeable roll to provide a nip for the passage of a web of paper or the like. The end portions of the exchangeable roll are mounted in bearings which are insertable into and extractible from sockets provided in levers which are pivotably mounted in the frame of the calender. The calender has a transporting unit which is provided with grippers for the bearings and with motors which reciprocate the grippers to extract the bearings from their sockets after the levers are pivoted to positions in which the exchangeable roll is spaced apart from the main roll. The transporting unit thereupon transfers the exchangeable roll onto a mobile rack which can be transported to a station where the exchangeable roll is repaired. The same rack or a discrete second rack can deliver a refurbished exchangeable roll to the transporting unit for introduction of the bearings on the refurbished roll into the sockets on the levers in the frame of the calender before the levers are pivoted to move the refurbished roll into engagement with a running web or with the main roll. Locking devices are provided to releasably hold the bearings in their sockets, and additional locking devices are provided to releasably hold the bearings in sockets which are provided on the rack or racks. The transporting unit can constitute a robot whose grippers then constitute effectors and whose operation is automated to start a roll exchanging operation as soon as one or more sensors in the calender ascertain that the quality of the exchangeable roll is unsatisfactory for further treatment of running webs.

Calender with exchangeable rolls

A magnetic audio or video tape is smoothed and/or otherwise treated by causing it to pass through one or more calenders wherein a large-diameter primary calender roll is heated from within and the major part of its peripheral surface is surrounded by the running tape. The primary roll rotates about a fixed axis and is surrounded by a cluster of two or more smaller-diameter secondary calender rolls each of which has a viscoelastic peripheral layer and each of which can be individually biased against the adjacent portion of the running tape with a selected force. The magnetic film on the tape is out of contact with the secondary rolls as well as with the guide rollers which cause the tape to advance toward the peripheral surface of the primary roll and thereupon toward a takeup reel.

Method and apparatus for calendering magnetic tapes

The roll assembly of a calender has at least one roll with a deformable shell which surrounds a rigid carrier and whose end portions surround discrete antifriction bearings. The intermediate portion of the shell surrounds one or more rows of hydrostatic supporting elements which can be acted upon by adjustable fluid-operated motors to change the shape of the intermediate portion in a plane including the axes of the one roll and the neighboring roll as well as at right angles to such plane. Stresses which are applied to the bearings for the end portions of the shell are monitored by several sensors which transmit signals to a control system to regulate the deformation of the shell in such a way that the stresses upon the bearings are minimized or reduced to zero. This enables the intermediate portion of the shell to undergo deformation which is best suited for optimum treatment of the material passing through the nip of the one roll and the neighboring roll.

Growing community of inventors

Krefeld, Germany

Josef Pav