FR2486178A1 - ROLLER FOR PRESSURE TREATMENT OF CONTINUOUS SHEETS - Google Patents

Abstract

ROLLER FOR PRESSURE TREATMENT OF CONTINUOUS SHEETS, INCLUDING AN ENCLOSURE SURROUNDING A RIGID CHUCK AND THE EFFECTIVE CIRCUMFERENCE OF WHICH IS FORMED BY A PADDING OF RUBBER OR RUBBERING PLASTIC MATERIAL. THE ROLLER ENVELOPE 1 IS MADE WITH A BICONIC INTERIOR CIRCUMFERENTIAL SURFACE AND BEEN SUPPORTED ON THE CHUCK 4 BY TWO CONICAL RINGS 7 MOVABLE AXIALLY IN REVERSE DIRECTION.

Description

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  The present invention relates to rollers for the pressure treatment of continuous sheets, having an envelope, which surrounds a rigid mandrel and whose effective circumference is formed by a lining of rubber or rubbery plastics.

  Rolls with elastomeric coatings are known for many

  many uses in various industrial sectors, for example for the production of paper and textile processing, for presses

  in printing, etc. With the exception of cases of little solicitation

  aunt, the following common problem always arises: to compensate for the inevitable arrow of the mandrel of the roll, produced by the pressure

  on the latter, in order to avoid the resulting changes in

  outer turns of the roll envelope in the work area and its adverse consequences on the work result. According to known proposals (see for example the patent of the Federal Republic of Germany No. 2,254,393), the envelope of the roll takes for

  this support on the mandrel realized in this case in the form of a sup-

  fixed port, through a number of hydrostatic

  static, in the form of piston elements fed by a fluid under pressure. This assembly, which is also suitable for envelopes

  metal rolls or made of elastomeric and

  carrying metal or other reinforcing layers where appropriate, has already proved itself under the most diverse conditions

  of practice. The setting of the support elements, sliding with

  and their feeding by a fluid under pressure

  however, a major construction and control expense. Linen-

  The aim of the invention is to achieve equivalent deflection compensation with a freely adjustable circumference of the roll at will between certain limits, without reduction of efficiency and with

much simpler mechanicals.

  According to an essential characteristic of the invention, the envelope of the roll is made with a biconical inner circumferential surface and bears on the mandrel by two bearing rings,

  conical in the same direction and axially movable in the opposite direction.

  According to another advantageous characteristic of the invention, the surface

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  circumferential circumference of the envelope is conical on both sides of its median plane, while one or more stems of

  adjustment crosses parallel to the axis the bearing rings

  guided on the mandrel, the threads having a different direction of pitch in the region of the two bearing rings. With surprisingly simple means, the invention provides a quality replacement for the known, expensive and trouble-sensitive hydrostatic bearings. The relative axial displacement towards the inside or the outside of the conical bearing rings, with the aid of the introduced adjustment rods, makes it possible to vary at

  will the support force acting radially on the circumferential surface

  biconical inner conferencing of the roll casing and

  consequently the bulge, as precompensation of the arrow of the mandrel.

  In order to reduce the friction between the conical surfaces sliding on one another, and according to another characteristic of the invention, the conical surface of the carrier rings facing the envelope of the

  roll is made with a low convexity corresponding to the bom-

  predetermined by the calculation. The conical shape is thus not

  modified in principle. According to another characteristic of the in-

  In the invention, the corresponding conical surface of the carrier rings or the roll shell has through grooves for the circulation of a coolant and / or a lubricant. The refrigerant or gaseous or liquid lubricant can in a known manner be directed

  in holes in the chuck, from an outside source, and

ler closed circuit.

  Other features and advantages of the invention will be better

  understood using the detailed description below of an example

  embodiment and the accompanying drawing in which the single figure shows a new printing roll, with longitudinal section

partial.

  The roller, serving for example as a presser in a press, essentially consists of a casing 1, on which is fitted or fixed an outer elastomeric shell 2, which surrounds with a radial spacing the mandrel 4 rotatably mounted in fixed bearings 3 and is held on said mandrel by means of discs

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  5, arranged on either side of the roller with a threaded locking ring 6. The casing 1 of the roller is made with a biconical inner circumferential surface, symmetrical and radially increasing diameter; it is supported on the mandrel 4 by two conical bearing rings 7. The two conical bearing rings 7 are joined by a plurality of adjustment rods 8 with opposite threads,

  housed in threaded through holes, distributed around the circumference

  ference; the rotation of the adjusting rods in one direction or the other makes it possible to move the bearing rings 7 on the mandrel 4, to bring them closer or further apart. The modifications thus produced from their spacing simultaneously cause radial deformations of the envelope 1 and, indirectly, variations in the convexity.

  the outer shell 2 elastomer.

  Holes 14 in the mandrel 4 make it possible to introduce a coolant or a lubricant in the direction of the arrows p, p and to circulate it in closed circuit in longitudinal grooves

  represented on the conical surfaces sliding on one another.

  Of course, various modifications may be made by those skilled in the art to the principle and to the devices which have just been described solely by way of nonlimiting examples, without

depart from the scope of the invention.

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Claims (6)

claims   1. Roll for pressure treatment of continuous sheets, comprising an envelope, which surrounds a rigid mandrel and whose effective circumference is formed by a lining of rubber or rubbery plastics, and characterized in that the envelope (1) is made with a biconical inner circumferential surface and bears on the mandrel (4) by two   carrier rings (7), conical in the same direction and axially movable in the opposite direction.   Roller according to claim 1, characterized in that the inner circumferential surface of the envelope (1) is flared conically.   on either side of its median plane.   3. Roll according to claims i and 2, characterized in that   or a plurality of adjusting rods (8) run parallel to the axis with the conical bearing rings (7) guided on the mandrel (4), the threads having a different pitch direction in the region of the two carrying rings.   4. Roll according to claims 1 to 3, characterized in that the   surface of the carrier rings (7) located opposite the envelope (1)   has through grooves for the circulation of a refrigerated rant and / or lubricant.   5. Roll according to claims 1 to 3, characterized in that the   inner circumferential surface of the envelope (1) located opposite the carrier rings (7) has through grooves   for the circulation of a refrigerant and / or a lubricant.   6. Roll according to claims 1 to 5, characterized in that the   conical surface of the carrier rings (7) located next to the enve-   loppe (1) is made with a low convexity.