Guide wheel arrangement

Abstract

The invention relates to a guide wheel arrangement for guiding two-dimensional material webs, in particular for guiding material webs or material sheets. The guide wheel arrangement comprises a guide wheel comprising an inner central hub section and an outer guide ring, which is connected to the inner hub section in a rotationally fixed manner for guiding the two-dimensional material elements, as well as an insert bushing which is to be arranged on a shaft and is concentrically inserted into the inner hub section, wherein the insert bushing is connected to the guide wheel in a rotationally fixed manner.

Claims

1. A guide wheel arrangement for guiding two-dimensional material elements, the guide wheel arrangement comprising: a guide wheel comprising an inner central hub section and an outer guide ring which is connected to the inner hub section in a rotationally fixed manner for guiding the two-dimensional material elements; and an insert bushing which is to be arranged on a shaft and is concentrically inserted into the inner hub section, wherein the insert bushing is connected to the guide wheel in a rotationally fixed manner, wherein at least one hub section window is formed in a periphery of the insert bushing, the hub section engaging from outside into the at least one hub section window.

2. A guide wheel arrangement according to claim 1, wherein the guide wheel arrangement is used for guiding one of the group comprising material webs and material sheets.

3. A guide wheel arrangement according to claim 1, wherein the guide wheel is made of a guide wheel material and the insert bushing is made of an insert bushing material, wherein the guide wheel material and the insert bushing material are different from each other.

4. A guide wheel arrangement according to claim 3, wherein the guide wheel material is or comprises polyurethane.

5. A guide wheel arrangement according to claim 3, wherein the insert bushing material is or comprises plastics.

6. A guide wheel arrangement according to claim 5, wherein the insert bushing material is or comprises polyamide.

7. A guide wheel arrangement according to claim 5, wherein the insert bushing material is or comprises polycaprolactam.

8. A guide wheel arrangement according to claim 1, wherein the outer guide ring is resiliently connected to the inner hub section.

9. A guide wheel arrangement according to claim 8, wherein the outer guide ring and the inner hub section are interconnected in a rotationally fixed manner by resilient spring webs.

10. A guide wheel arrangement according to claim 9, wherein the spring webs are inclined in a peripheral direction of at least one of the guide ring and the hub section.

11. A guide wheel arrangement according to claim 1, wherein the guide wheel is a cast part.

12. A guide wheel arrangement according to claim 11, wherein the guide wheel is cast around the insert bushing.

13. A guide wheel arrangement according to claim 1, wherein the hub section engages into the at least one hub section window such that a positive fit connection is formed between the guide wheel and the insert bushing.

14. A guide wheel arrangement according to claim 1, wherein the hub section passes through the at least one hub section window from outside such as to form a positive fit connection between the guide wheel and the insert bushing and protrudes relative to the hub section window in a radially inward direction so as to abut against the shaft.

15. A guide wheel arrangement according to claim 14, wherein the hub section protrudes relative to the at least hub section window in a radially inward direction by an amount in a range of between 0.1 mm and 2 mm.

16. A guide wheel arrangement according to claim 1, wherein the at least one hub section window is completely closed in a peripheral direction of the at least one hub section window.

17. A guide wheel arrangement according to claim 1, wherein more than one hub section is provided to provide a number of hub section windows, wherein the hub section windows have an identical distance from each other in a peripheral direction of the insert bushing.

18. A guide wheel arrangement according to claim 1, wherein each front end of the insert bushing is provided with an annular web protruding in a radially outward direction, wherein the annular webs engage into corresponding annular recesses in the guide wheel in such a way as to form a positive fit connection between the guide wheel and the insert bushing.

19. A guide wheel-shaft arrangement comprising: a shaft; and at least one guide wheel arrangement which is arranged on the shaft, said at least one guide wheel arrangement comprising a guide wheel, said guide wheel comprising an inner central hub section and an outer guide ring which is connected to the inner hub section in a rotationally fixed manner for guiding two-dimensional material elements, said guide wheel arrangement further comprising an insert bushing which is to be arranged on a shaft and is concentrically inserted into the inner hub section, the insert bushing being connected to the guide wheel in a rotationally fixed manner, wherein at least one hub section window is formed in a periphery of the insert bushing, the hub section engaging from outside into the at least one hub section window, the insert bushing being positioned adjacent to the shaft, the insert bushing being arranged between the shaft and the guide wheel.

20. A guide wheel-shaft arrangement according to claim 19, wherein a portion of the guide wheel passing through the at least one hub section window abuts against the periphery of the shaft for transmission of a torque from the shaft to the guide wheel.

21. A guide wheel-shaft arrangement according to claim 20, wherein the portion of the guide wheel passing through the at least one hub window allows transmission of the torque which is substantially predefined.

22. A cross-cutting device for the cross-cutting of material webs, comprising: at least one cross-cutting unit; and at least one guide wheel-shaft arrangement which is arranged relative to the cross-cutting unit in at least one of the positions comprising an upstream and a downstream position, said at least one guide wheel arrangement comprising a guide wheel, said guide wheel comprising an inner central hub section and an outer guide ring which is connected to the inner hub section in a rotationally fixed manner for guiding the two-dimensional material elements, said guide wheel arrangement further comprising an insert bushing which is to be arranged on a shaft and is concentrically inserted into the inner hub section, the insert bushing being connected to the guide wheel in a rotationally fixed manner, wherein at least one hub section window is formed in a periphery of the insert bushing, the hub section engaging from outside into the at least one hub section window.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 shows a front view of a guide wheel-shaft arrangement according to the invention;

(2) FIG. 2 shows a longitudinal section along section line II-II in FIG. 1 through the guide wheel-shaft arrangement shown in FIG. 1;

(3) FIG. 3 shows a cross-section through the guide wheel-shaft arrangement shown in FIGS. 1 and 2;

(4) FIG. 4 shows a front view of a guide wheel of the guide wheel-shaft arrangement shown in FIGS. 1 to 3;

(5) FIG. 5 shows a longitudinal section along section line V-V in FIG. 4 through the guide wheel shown in FIG. 4;

(6) FIG. 6 shows a front view of an insert bushing of the guide wheel-shaft arrangement shown in FIGS. 1 to 3; and

(7) FIG. 7 shows a longitudinal section along section line VII-VII in FIG. 6 through the insert bushing shown in FIG. 6.

DESCRIPTION OF THE PREFERRED EMBODIMENT

(8) A guide wheel-shaft arrangement shown in its entirety in FIGS. 1 to 3 comprises a shaft 1 and a guide wheel arrangement 2 which is disposed on the shaft 1 and forms a torque-transmitting connection with said shaft 1. The guide wheel arrangement 2 has a guide wheel 3 and an insert bushing 4 inserted centrally into the guide wheel 3. The guide wheel-shaft arrangement has a central longitudinal axis 5 about which it is rotatable or drivable for rotation.

(9) The guide wheel 3 is in turn provided with a radially inner central hub section 6 and a radially outer guide wheel 7 which forms a rotationally fixed and resilient connection with the hub section 6 via spring webs 8.

(10) The hub section 6 defines a cylindrical receiving opening 9 in a radially outward direction. The hub section 6 has engagement projections 10 which protrude radially inwardly into the receiving opening 9, have an identical angular distance from each other relative to the central longitudinal axis 5 or in the peripheral direction of the hub section 6, respectively, and are configured identically. The engagement projections 10 are configured in the manner of a spring. They are arranged at a distance from the front ends 11 of the guide wheel 3 which are arranged opposite to each other. The engagement projections 10 extend in the direction of the central longitudinal axis 5 and have rounded longitudinal ends 12 arranged opposite to each other. In this embodiment, four engagement projections 10 are provided. Another number is conceivable as well.

(11) The guide wheel 7, which has the shape of a circular cylinder, has a radially outer guide surface 13 which may also be referred to as running surface.

(12) As already mentioned, the guide wheel 7 is connected to the radially inner hub section 6 in a rotationally fixed manner via spring webs 8. The spring webs 8 are inclined in the peripheral direction of the guide wheel 3, thus extending at an angle relative to the radial as well. The spring webs 8 define spring chambers 14 in the peripheral direction of the guide wheel 3. They may be straight or curved. The spring chambers 14 become wider when seen from the hub section 6 in the direction of the guide wheel 7. The spring chambers 14 are bounded in the radially inward direction by the hub section 6 and by the guide wheel 7 in the radially outward direction. Another arrangement of the spring webs 8 or of the spring chambers 14 is alternatively conceivable as well.

(13) The front ends of the insert bushing 4 are in each case provided with an annular web 15 protruding in the radially outward direction. The annular webs 15 engage with corresponding annular recesses in the guide wheel 3 such that a positive fit is formed, which ensures that the insert bushing 4 and the hub section 6 are axially secured in the direction of the central longitudinal axis 5.

(14) The insert bushing 4 is provided with elongated hub section windows 16 which completely penetrate or pass through the insert bushing 4 in the radial direction. The number, shape and arrangement of the hub section windows 16 is in each case adapted to the number, shape and arrangement of the engagement projections 10. In other words, the insert bushing 4 is provided with four hub section windows 16. The hub section windows 16 are arranged at a distance from the front ends 17 of the insert bushing 4, each extending in the direction of the central longitudinal axis 5. They have rounded longitudinal ends 18. The radial thickness of the insert bushing 4 in the region of the hub section windows 16 is lower than the radial height of the engagement projections 10. The insert bushing 4 has a substantially constant radial thickness between the annular webs 16.

(15) The engagement projections 10 completely pass through and engage into the hub section windows 16 from radially outside in such a way that a positive fit is formed. The engagement projections 10 protrude radially inwardly relative to the hub sections windows 16 or the insert bushing 4, respectively. Preferably, the engagement projections 10 protrude radially inwardly relative to the hub section windows 16 or the insert bushing 4, respectively, by an amount in the range of between 0.1 mm and 2 mm, more preferably between 0.2 mm and 1 mm, allowing a corresponding intermediate or free space having a radial height of this magnitude to be produced between the shaft 1 and the insert bushing 4 as well. The positive engagement between the engagement projections 10 and the hub section windows 16 ensures that the guide wheel 3 and the insert bushing 4 are on the one hand axially secured in the direction of the central longitudinal axis 5 and that the guide wheel 3 and the insert bushing 4 are secured in the peripheral direction of the guide wheel arrangement on the other, which allows a torque to be transmitted between the insert bushing 4 and the guide wheel 3. The connection between the guide wheel 3 and the insert bushing 4 is quasi a tongue-and-groove connection.

(16) When the guide wheel arrangement 2 is mounted to the shaft 1, the engagement projections 10 abut against the outer periphery of the shaft 1, thus providing for a torque transmission between the shaft 1 and the guide wheel arrangement 2. The engagement projections 10 protruding radially inwardly relative to the hub section windows 16 or the insert bushing 4, respectively, provide for a substantially annular intermediate or free space having a radial height of between 0.1 and 2 mm, more preferably between 0.2 mm and 1 mm. As soon as a threshold torque value is reached, a relative rotational movement is possible between the shaft 1 and the guide wheel arrangement 2. The engagement projections 10 allow transmission of a substantially predefined maximum torque.

(17) The guide wheel arrangement is mountable near the inlet and/or outlet of a cross-cutting device (not shown). The cross-cutting device performs the cross-cutting process. The guide wheel-shaft arrangement may for instance be mounted downstream of the cross-cutting unit to produce the required distance between the individual material webs.