EP0215033A1

EP0215033A1 - Interchangeable roll and utilization thereof in printing machines

Info

Publication number: EP0215033A1
Application number: EP86901327A
Authority: EP
Inventors: Hans Hess; Peter Widmer
Original assignee: Huber and Suhner AG
Current assignee: Huber and Suhner AG
Priority date: 1985-03-20
Filing date: 1986-03-10
Publication date: 1987-03-25
Also published as: WO1986005447A1

Abstract

Le rouleau (2) est formé d'un cylindre creux et muni d'un revêtement (3) de matière élastique. Les tourillons (4) de montage du rouleau (1) sont serrés de manière amovible à l'intérieur du rouleau (2). Dans ce but, des éléments de serrage (6) qui peuvent être fixés de l'extérieur sont utilisés. Ces éléments sont constitués de préférence d'anneaux élastiques (7, 7') qui peuvent être comprimés à l'aide d'une douille de serrage (8) et être ainsi pressés pour liaison de force contre la paroi intérieure du rouleau (2). Les tourillons (4) fixés de cette façon peuvent être utilisés plusieurs fois, tandis que le corps du rouleau (2) dont le revêtement (3) est usé ou endommagé peut être jeté comme un article de consommation.The roller (2) is formed of a hollow cylinder and provided with a covering (3) of elastic material. The mounting pins (4) of the roller (1) are removably clamped inside the roller (2). For this purpose, clamping elements (6) which can be fixed from the outside are used. These elements preferably consist of elastic rings (7, 7') which can be compressed using a clamping sleeve (8) and thus be pressed for forceful connection against the inner wall of the roller (2). . The pins (4) fixed in this way can be used several times, while the roller body (2) whose coating (3) is worn or damaged can be thrown away as a consumer item.

Description

Interchangeable roller and its use in printing machines

The invention relates to an interchangeable roller according to the preamble of claim 1. Coated rollers are used in various industries for a wide variety of processes. In the printing industry in particular, rollers with a rubber or plastic coating are used.

Since the coating of the rollers is exposed to heavy wear, the coating will wear off over time, so that proper functioning during the printing process is no longer guaranteed. The printer must therefore replace the offset rollers in a certain cycle. Up to now it was common for the gumming plant to pick up the rolls from the printer and re-coat them within approx. 4 to 8 weeks. Since the printer cannot wait so long for the newly coated rollers, newly coated replacement rollers had to be used each time the rollers were picked up. Obviously, this necessitates storage of rollers at the gumming plant, since prolonged downtimes of the printing machines must be avoided under all circumstances. However, the constant cycle of the rollers causes large administrative expenses such as Warehouse accounting, operational planning, sales organization, etc. This is obviously associated with high costs, which ultimately have an impact on the printed products.

It is therefore an object of the invention to provide a roll of the type mentioned at the outset, in which the roll circuit between the printer and the gumming unit can be completely eliminated and which the printer itself can replace in a few simple steps. This presupposes that the roller is designed as a one-way roller, which is not re-gummed up when the coating is worn, but is thrown away. This procedure is obviously only economical if the bearing journals designed as precision parts can be used several times. The object is thus achieved according to the invention by a roller having the features in the characterizing part of claim 1.

The detachable fastening of the bearing journals inside the roller is extremely space-saving, since there is too little space for connecting elements outside the roller, such as flanges etc. The tensioning in the interior of the roll has countries except the .Vorteil that the roller is centered relative to the machine ^'n-sided bearing points accurately. The printer can release the tension in a few simple steps and remove the bearing journals at both ends of the roller body. The roller body itself can be produced inexpensively, so that it can be thrown away as a consumable when the coating is worn. By eliminating the costly rubber coating of the roller bodies, considerable savings can be made overall. The printer only buys the required number of trunnions once and keeps them with him at all times. The coated roller bodies can be produced by the manufacturer in stock, so that they can be delivered practically at any time by the printer. In addition, the printer can keep his own stock of coated roller bodies, which he can use himself at any time in the storage locations of the machines. ^*

A particularly advantageous fixation of the bearing pins results if they have at least one centering section have, which can be inserted into the hollow cylindrical section of the roller body with a clearance fit and if a tensioning element is arranged in the pushed-in region of the bearing journal. The centering section ensures that the bearing journal is pushed in parallel to the axis and prevents jamming when the bracing is locked. The tensioning element itself is arranged on the bearing journal and not on the roller body, so that the tensioning element can also be used several times.

A particularly advantageous bracing results if the tensioning element has at least one ring made of elastic material, which can be pressed together in the axial direction by means of a tensioning bushing such that the outer wall of the ring presses non-positively against the inner wall of the hollow cylindrical section. ^• the ring may be for example made of rubber or of a plastic material. With the ring, this not only creates a positive connection, but also a damping effect. Vibrations on the roller are therefore not transmitted, or only to a small extent, to the machine-side bearing points. The clamping bush ensures a uniform axial compression of the elastic ring and thus an exactly centered attachment. This arrangement also allows a stepless axial displacement of the bearing pin relative to the roller body. This is particularly advantageous when an exact adjustment of the roller body is required.

If the ring is firmly connected on its two sides exposed to the pressing force to a relatively rigid material layer, the elastic ring is uniformly expanded when pressed together. The ring can, for example, be vulcanized onto a metal disc on both sides. If the clamping bush can be locked with a threaded bolt fixedly arranged on the bearing pin, only the bearing pin need be rotated about its axis in order to fix the clamping element. The bearing journal can thus be made from a minimum of individual components. In certain applications, however, it can also be expedient if the bearing journal has an axial bore and if the clamping bush can be locked with a screw arranged in the axial bore. In this variant, the bracing can also be released without turning the bearing journal, so that at most it is even possible to loosen the connection when the bearing journal is clamped.

The roller body is particularly advantageously manufactured from a continuous tube. To be because the bearing pins are not formed integrally with the roll body, the tube need not necessarily made from a high quality material ^'. It is sufficient if the tube with regard to the choice of material and dimensioning is just such that it can withstand the mechanical stresses during the approximately two-year period of use. In contrast, the bearing journals can be easily made from a high-quality steel. The service life of the trunnions can also be improved by surface finishing such as coating or hardening, which was previously not practically possible.

Two rings are particularly advantageously provided as the tensioning element, between which a spacer sleeve is arranged. This results in clamping in two planes spaced apart from one another. On the one hand, this improves the centering and prevents the bearing journal from swinging around the clamping point.

In certain applications, it can be advantageous if retaining bushes are provided on the end faces of the roller body are pressed into a bore, and if the bearing journals each have a bolt which can be inserted into the bore with a precise fit, the bearing journal being able to be clamped in the axial direction on the holding bush by means of a screw connection. This solution is particularly expedient in the case of roller bodies with a relatively large diameter, since otherwise radially acting clamping elements of relatively large diameter would have to be used. The pressed-in retaining bushes on the end faces of the roller body reduce the diameter and also allow bracing in the axial direction. Of course, radially acting clamping elements of the type described above could also be used in the bores of the pressed-in holding bushes.

Various embodiments of the invention are illustrated in the drawings and are described in more detail below. Show it:

characters

1 to 3 show a cross section through various exemplary embodiments of bearing journals in which the clamping bush is braced by a threaded bolt arranged on the bearing journal,

FIG. 4 shows a modified exemplary embodiment in which the clamping bush is fixed by means of a screw guided through the bearing journal,

Figure 5 is a detailed view of a clamping element, and

FIG. 6 shows a modified exemplary embodiment with a pressed-in retaining bush and axially braced bearing pin.

Figure 1 shows the end of a roller 1 consisting of the roller body 2, which is coated with a coating 3 of elastic is provided chemical material, and from the journal 4. The roller body 2 is preferably made of a tube made of metal or plastic. This tube is covered with the coating 3 made of rubber, polyurethane, etc. and cut to the required length. The coating 3 is then ground to the nominal diameter.

The bearing pin 4 consists of a section pushed into the roll body 2 and a section protruding from the roll body 2, no defined interface having to exist between the two sections. On the section of the bearing journal 4 protruding from the roller body, bearing elements, not shown, such as roller bearings, etc. are arranged in order to support the bearing journal in machine-side bearing locations. The bearing pin 4 has at least one cylindrical centering section 5 which can be inserted into the roller body 2 with a clearance fit. In the exemplary embodiment according to FIG. 1, this function is carried out by the clamping bush 8, the spacer sleeve 12 and a ring which is arranged directly in the opening area of the roller body. Two rings 7 and 7 ¹ made of elastic material are held at a certain distance by the spacer sleeve 12. The clamping bush 8 and rings 7 together form the clamping element 6. In the present exemplary embodiment, the clamping bush 8 consists of a ring and a disk-like nut, which rests against rotation against the ring.

A threaded bolt 9 on the bearing pin 4 is screwed into the clamping bush 8. When turning the bearing pin 4, the rings 7 are clamped between the clamping bush 8 and the shoulder 17 on the bearing pin, so that their diameter widens radially. The widening of the diameter leads to a non-positive tensioning between the bearing journal 4 and the roller body 2. Obviously, the bearing journal 4 can be fixed and released in a few simple steps to reach. To rotate the bearing pin 4, a bore for attaching a socket wrench or a milling cut for attaching a square or hexagon wrench is preferably attached to it.

The exemplary embodiment according to FIG. 2 shows a somewhat simplified construction, in which the rings 7, 7 'are approximately trapezoidal in cross section. The ring 7 * lies directly on the shoulder 17 without an intermediate sleeve. The outer diameter of the shoulder 17 also serves as a centering section 5. The clamping sleeve 8 is formed in one piece.

In the exemplary embodiment according to FIG. 3, the clamping bush 8 in particular has a different configuration than in the exemplary embodiments shown in FIGS. 1 and 2. FIG. The clamping bush 8 serves here simultaneously for the centered reception of the bearing pin 4. The spacer sleeve 12 is pushed onto the clamping bush 8 and not onto the bearing pin 4.

An alternative way of locking the clamping bush 8 is shown in FIG. The bearing pin 4 is provided with an axially extending, continuous bore 10. A screw 11, which engages in the clamping bush 8, is arranged in this bore. The head of the screw 11 advantageously has an internal hexagon, so that the tensioning element can be released from the outside without twisting the bearing pin 4. In this exemplary embodiment too, a portion of the bearing journal 4 is formed directly as a centering portion 5. Instead of the elastic rings 7, other locking elements would of course also be conceivable. For example, conical pairs of rings pushed into one another or also so-called ring-clamping star disks could be used. As shown in Figure 5, the ring 7 is preferably firmly connected on both sides with a metal ring 19. Since the ring expands radially when pressed together, there is a relative movement between the ring surface and the clamping sleeve 8 or spacer sleeve 12. As a result of the high friction between plastic and metal, this could result in the ring 7 being distorted and thus in poor centering. This ^is' tallringe by Me "19 reliably avoided, as these can slide 12 on the end face of the clamping bush 8 and the spacer sleeve. The ring 7 can be ized aufvulka¬ directly to the surface of the metal rings 19. Also sticking would be conceivable. When rigid material layer could also be replaced by a particularly hard plastic instead of metal, which has good sliding properties.

A further embodiment of the invention is shown in FIG. 6, in which the tension in the interior of the roller body 2 does not take place radially but axially. For this purpose, a holding sleeve 13 is pressed into the roller body 2. The holding sleeve 13 can, for example, be provided with star tolerance rings 18 which ensure a secure fit of the holding sleeve. The holding bush 13 is provided with a bore 14 into which a bolt 15 of the bearing pin 4 can be inserted with a precise fit. The bearing pin 4 is braced in the axial direction by means of a screw connection 16, the nut of which is supported on the holding bush 13.

The rollers according to the invention result in considerable advantages, particularly when used in offset printing machines. The disposable rollers are easy to manufacture in all lengths and diameters and with all required covering materials. It is only the special design of the bearing journals that enables cost-effective production and the use of disposable rollers. The machine-side storage len are usually designed so that the trunnions can be lifted out of the bearing point in the simplest way. The removal of the bearing journals from the roller bodies or the replacement of the roller bodies requires neither special knowledge nor special tools and can be carried out by the printer itself.

Claims

1. Interchangeable roller (1) consisting of a Walzen¬ body (2) with a coating (3) made of elastic material and each with a journal (4) on both ends of the roller body for attaching the roller in machine-side bearings, thereby gekennzeich¬ net that the roller body (2) is hollow-cylindrical at least in the area of the end faces and that the bearing pins (4) are releasably clamped in the hollow-cylindrical sections.

2. Roller according to claim 1, characterized in that a journal (4) has at least one centering section (5) which can be inserted into the hollow cylindrical section with a clearance fit, and that a clamping element ^'is inserted in the inserted region of the journal ^. t (6) is arranged.

3. Roller according to claim 2, characterized in that the clamping element (6) has at least one ring (7) made of elastic material which can be compressed in the axial direction by means of a clamping sleeve (8) such that the outer wall of the ring ( 7) presses against the inner wall of the hollow cylindrical section.

4. Roller according to claim 3, characterized in that the ring (7) is firmly connected on its two sides exposed to the pressing force with a relatively rigid material layer.

5. Roller according to claim 3, characterized in that the clamping bush (8) with a on the bearing pin (4) angeord¬ Neten threaded bolt (9) can be determined.

6. Roller according to claim 3, characterized in that the bearing pin (4) has an axial bore (10), and that the clamping bush (8) can be locked with a screw (11) arranged in the axial bore (10).

7. Roller according to one of claims 1 to 6, characterized gekenn¬ characterized in that the roller body (2) 'is a tube.

8. Roller according to one of claims 4 to 7, characterized gekenn¬ characterized in that two rings (7, 7 ¹ ) are provided as the clamping element (6), between which a spacer sleeve (12) is arranged.

9. Roller according to claim 1 and 7, characterized in that on the end faces of the roller body (2) holding sleeves (13) with a bore. (14) are pressed in, and that the bearing journals (4) each have a bolt (.15) * which can be inserted into the bore (14) with a precise fit, the bearing journals (4) being connected by a screw connection (16) can be clamped in the axial direction on the holding bush (13).

10. Use of rollers according to one of claims 1 to 9 in printing machines, in particular offset printing machines as printing rollers, which are subject to wear during operation and must be exchanged, the journals being released from the machine-side bearing points for the exchange and the Bearing pins are removed from the worn roller bodies, after which the bearing pins are fastened in a new roller body and the latter can be stored again on the machine side.