Roller

Abstract

A roller guides and processes synthetic strand material. The roller includes a drivable roller shell. The roller shell has, on a projecting free end thereof, a cover which is effective relative to the surroundings. In order to secure the end of the roller shell relative to an operating side, the cover is freely rotatably connected to the roller shell.

Claims

1. Roller for guiding and treating synthetic strand materials, having a drivable roller shell, which is hollow-cylindrical and which has, on a projecting free front end thereof, a cover which shields the interior of the roller shell against surrounding environment influences, wherein the cover is connected to the roller shell in a freely rotatable manner, and wherein the roller is constructed and arranged to receive support on a supported end which is opposite the projecting free front end, and not receive support on the projecting free front end.

2. Roller as claimed in claim 1, wherein at the front end a cover carrier is provided between the roller shell and the cover, which cover carrier is fixedly connected to the roller shell and rotatably holds the cover.

3. Roller as claimed in claim 2, wherein the cover carrier has a central bearing bore, in which a bearing journal is rotatably held, and the cover is fixedly connected to the bearing journal.

4. Roller as claimed in claim 3, wherein the bearing journal is mounted in the cover carrier by one or more rolling bearings.

5. Roller as claimed in claim 4, wherein the roller further has a heating means disposed on the inside of the roller shell, and thermal insulation disposed on an inner side or outer side of the cover.

6. Roller as claimed in claim 4, wherein the cover is formed from an inner cover and an outer cover, wherein the inner cover and the outer cover encase a thermal insulation.

7. Roller as claimed in claim 6, wherein the thermal insulation is formed by a plurality of air chambers, wherein the air chambers are uniformly distributed within the cover.

8. Roller as claimed in claim 7, wherein the air chambers are formed by circumferential grooves on a front end face of the inner cover which front end face is opposite a closed front end face of the outer cover.

9. Roller as claimed in claim 8, wherein the outer cover is formed from a thermally insulating material.

10. Roller apparatus for guiding and treating synthetic strand materials, the roller apparatus comprising: a drivable roller shell which defines a projecting free front end and a supported end which is opposite the projecting free front end, the roller shell being operative to receive support on the supported end and not receive support on the projecting free front end; and a cover which, with respect to a surrounding environment, covers at least a portion of the projecting free front end, wherein the cover connects to the roller shell in a freely rotatable manner.

11. Roller for guiding and treating synthetic strand materials, having a drivable roller shell, which is hollow-cylindrical and which has, on a projecting free front end thereof, a cover which shields the interior of the roller shell against surrounding environment influences, wherein the cover is connected to the roller shell in a freely rotatable manner, wherein at the front end a cover carrier is provided between the roller shell and the cover, which cover carrier is fixedly connected to the roller shell and rotatably holds the cover, wherein the cover carrier has a central bearing bore, in which a bearing journal is rotatably held, and the cover is fixedly connected to the bearing journal, wherein the bearing journal is mounted in the cover carrier by one or more rolling bearings, wherein the cover is formed from an inner cover and an outer cover, wherein the inner cover and the outer cover encase a thermal insulation, wherein the thermal insulation is formed by a plurality of air chambers, wherein the air chambers are uniformly distributed within the cover, and wherein the air chambers are formed by circumferential grooves on a front end face of the inner cover which front end face is opposite a closed front end face of the outer cover.

12. Roller as claimed in claim 11, wherein the outer cover is formed from a thermally insulating material.

Description

(1) The invention will be explained hereinafter in greater detail on the basis of a number of exemplary embodiments of the roller according to the invention, with reference to the accompanying figures.

(2) In the figures:

(3) FIG. 1 schematically shows a cross-sectional view from one front end in accordance with a first exemplary embodiment of the roller according to the invention,

(4) FIG. 2 schematically shows a cross-sectional view from one front end in accordance with a further exemplary embodiment of the roller according to the invention.

(5) In FIG. 1 a first exemplary embodiment of a roller according to the invention is illustrated, wherein only the parts of the roller essential to the invention are shown in a cross-sectional view. The roller has a drivable roller shell 1. The roller shell 1 is for this purpose mounted rotatably and in a projecting manner on a roller support (not illustrated here) and is coupled to a drive, for example an electric motor or a transmission. The roller shell 1 is hollow-cylindrical and has at one front end 2 a cover 3. The cover 3 is freely rotatable and is held rotatably in a cover carrier 4 via a central bearing journal 7. The cover carrier 4 for this purpose has a central bearing bore 6. The bearing bore 6 is formed by a central bearing collar 5, which is formed on the planar cover carrier 4.

(6) At the circumference, the cover carrier 4 has a circumferential mounting flange 9, which is fixedly connected to the roller shell 1 by means of a cover fastening 18. The cover fastening 19 is formed in this exemplary embodiment by a plurality of screw means.

(7) The bearing journal 7 is held rotatably within the bearing bore 6 by a plurality of rolling bearings 8.1 and 8.2, wherein a retaining ring 20 is arranged at an end of the bearing journal 7 formed internally of the roller shell 1.

(8) A retaining flange 21 is formed integrally on the opposite end of the bearing journal 7 and extends substantially in a recess 22 in the cover carrier 4. The cover 3 is held at the retaining flange 21 via a cover fastening 19. The cover fastening 19 is formed in this exemplary embodiment by a plurality of screw means.

(9) The cover 3 has an outer diameter that is greater than the outer diameter of the cover carrier 4, wherein the cover 3 has a circumferential protective collar 23, which extends until just before the front end 2 of the roller shell 1. The cover 3 thus protrudes at the front end 2 of the roller shell 1.

(10) In FIG. 2 a further exemplary embodiment of a cover is schematically illustrated, showing how this is preferably used in the case of heated roller shells. The exemplary embodiment according to FIG. 2 is substantially identical to the exemplary embodiment according to FIG. 1, and therefore only the differences will be explained at this juncture, reference being made otherwise to the previous description.

(11) In the exemplary embodiment of the roller illustrated in FIG. 2 the roller shell 1 is assigned a heating means 14 on the inside. In this respect, the roller shell can be heated to higher temperatures in the range above 100 C.

(12) In order to prevent a heating of the cover 3 at the front end 2 of the roller shell 1, the cover 3 is formed in this exemplary embodiment by an outer cover 11 and an inner cover 10. The inner cover 10 and the outer cover 11 are screwed to one another, wherein the inner cover 10 has, on a front end face 16, a plurality of circumferential grooves 15. The grooves 15 are arranged concentrically with one another and are separated from one another by webs 24. The webs 24 here form a contact surface for a front end face 17 of the outer cover 11. In this respect, a plurality of air chambers 13 are formed within the cover 3. The air chambers 13 constitute a thermal insulation 12 that prevents the transfer of heat from the inner cover 10 to the outer cover 11. The contact surface between the inner cover 10 and the outer cover 11 is additionally considerably reduced, such that there is a direct transport of heat only via the webs 24.

(13) In addition, the outer cover 11 is formed from a thermally insulating material, which has a very low thermal conductivity.

(14) The inner cover 10 and the outer cover 11 are fixedly connected jointly via a retaining flange 21 to a bearing journal 7, which is mounted rotatably in a cover carrier 4. The design of the cover carrier 4 and of the bearing journal 7 is identical to the exemplary embodiment according to FIG. 1, and therefore reference can be made to the previous description.

(15) In the case of the cover 3 illustrated in FIG. 2 the thermal insulation 12 formed by air chambers 13 is merely exemplary. In principle, the inner cover 10 by way of example may be formed from a thermally insulating material. It is essential here to guarantee the stability of the cover.

(16) The exemplary embodiments according to FIGS. 1 and 2 constitute only possible design variants of a freely rotatable cover on the front end of a roller. It is essential here that the contact surface formed by the cover is held at the front end of the roller shell in a manner decoupled from the rotational movement of the roller shell. The embodiment of the bearing between the cover and the cover carrier is thus exemplary. The rolling bearing system can thus also be formed advantageously with just a needle bearing.

(17) Alternatively, it is possible to use a plain bearing in order to be able to move the cover relative to the cover carrier.

(18) Depending on the condition of the roller it is also possible to provide the cover carrier with a bearing journal and to provide the cover with a bearing bore.

(19) The cover could also be mounted directly via a sliding disc in a recess of the cover carrier. It is essential to the invention that the outer cover at the front end face of the roller is decoupled from the rotational movement of the roller.