Ejector for a Forestry Winch

Abstract

An ejector for a forestry winch that includes a rotating ejector roller, over which a synthetic rope is guided and deflected, wherein the ejector roller is driven by a drive motor, and at least one rotating pressure roller, by means of which the synthetic roe is pressed against the ejector roller, wherein the driven ejector roller and the at least one rotating pressure roller are coupled in rotation.

Claims

1. An ejector for a forestry winch, comprising: a rotating ejector roller, over which a synthetic rope is guided and deflected, wherein the ejector roller is driven by a drive motor; and at least one rotating pressure roller, by means of which the synthetic rope is pressed against the ejector roller, wherein the driven ejector roller and the at least one rotating pressure roller are coupled in rotation.

2. The ejector according to claim 1, wherein the at least one rotating pressure roller has a rubberized surface by means of which the at least one rotating pressure roller is in contact with the synthetic rope.

3. The ejector according to claim 1, wherein, between the driven ejector roller and the at least one rotating pressure roller, a transmission is provided for driving the at least one rotating pressure roller by the ejector roller.

4. The ejector according to claim 1, wherein, between the driven ejector roller and the at least one rotating pressure roller, a gearing is provided for driving the at least one rotating pressure roller by the ejector roller.

5. The ejector according to claim 1, wherein, between the driven ejector roller and the at least one rotating pressure roller, a transmission of force is provided for driving the at least one rotating pressure roller by the ejector roller.

6. The ejector according to claim 1, wherein the at least one rotating pressure roller has a rubberized surface by means of which the at least one rotating pressure roller is in contact with the ejector roller.

7. The ejector according to claim 1, wherein the ejector roller has a locator groove for the synthetic rope, wherein the locator groove has a groove base on which the synthetic rope lies, and two lateral groove flanks, wherein the at least one rotating pressure roller protrudes into the locator groove of the ejector roller and the at least one rotating pressure roller is configured so that the at least one rotating pressure roller protrudes into the locator groove, so that the synthetic rope is pressed by an outside circumferential surface of the at least one rotating pressure roller against the groove base, and end surfaces of the at least one rotating pressure roller are in contact with the groove flanks of the ejector roller.

8. The ejector according to claim 7, wherein the outside circumferential surface that protrudes into the locator groove, at least the areas of the end surfaces of the at least one rotating pressure roller that protrude into the locator groove, or the outside circumferential surface that protrudes into the locator groove and at least the areas of the end surfaces of the at least one rotating pressure roller that protrude into the locator groove are provided with a rubberized surface.

9. The ejector according to claim 8, wherein the rubberized surface is vulcanized onto the at least one rotating pressure roller.

10. The ejector according to claim 1, wherein the at least one rotating pressure roller is biased toward the ejector roller by means of a bias device.

11. The ejector according to claim 1, wherein the drive motor is a hydraulic motor or an electric motor.

12. The ejector according to claim 1, wherein the ejector has a rope ejector opening for the synthetic rope, which is delimited laterally by two side plates between which the synthetic rope is guided, wherein the side plates have rounded inside edges configured as curved rope runout edges.

13. The ejector according to claim 12, wherein the side plates are located laterally on the ejector roller, and, in the vicinity of the rope ejector opening, have a circular circumferential surface.

14. The ejector according to claim 12, wherein the rope ejector opening is delimited vertically upward by a top limit pin and vertically downward by a bottom limit pin.

15. A forestry winch, comprising: a rope drum driven by a drive motor and an ejector according to claim 1, wherein a synthetic rope is guided from the rope drum to the ejector roller and over the ejector roller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Additional advantages and details of the disclosure are described in greater detail below with reference to the exemplary embodiments illustrated in the accompanying schematic figures, in which

[0026] FIG. 1 is a schematic illustration of a forestry winch according to the invention,

[0027] FIG. 2 is a detail A of the ejector roller in FIG. 1 in an enlarged schematic illustration,

[0028] FIG. 3 shows the ejector roller from FIGS. 1, 2 with the rope ejector opening,

[0029] FIG. 4 is a head-on view of FIG. 3, and

[0030] FIG. 5 is a schematic illustration of an ejector roller with a plurality of pressure rollers according to the disclosure.

DESCRIPTION OF THE DISCLOSURE

[0031] FIG. 1 is a schematic illustration of a forestry winch 1 according to the disclosure. FIG. 1 is a head-on view of the forestry winch 1 according to the disclosure.

[0032] The forestry winch 1 has a rope drum 3 which is driven by a drive motor 2 and on which a synthetic rope 4 is spooled. The rope drum 3 can rotate around an axis of rotation 5 and is driven by the drive motor 2. The drive motor 2 can be a hydraulic motor or an electric motor, for example. The forestry winch 1 also has an ejector 6 with an ejector roller 7 which rotates around an axis of rotation 8.

[0033] The synthetic rope 4 is guided from the rope drum 3 in the vertical direction V to the ejector roller 7, guided over the ejector roller 7 and deflected on the ejector roller 7 so that the synthetic rope 4 is guided away from the ejector roller 7 in the horizontal direction.

[0034] The ejector 6 also has at least one pressure roller 10 which rotates around an axis of rotation 11 and by means of which the synthetic rope 4 is pressed against the ejector roller 7.

[0035] The ejector roller 7 according to the disclosure is driven by a drive motor 12. The drive motor 12 can be a hydraulic motor or an electric motor, for example. According to the disclosure, the pressure roller 10 is rotationally coupled with the ejector roller 7 driven by the drive motor 12, so that the pressure roller 10 is driven by the ejector roller 7.

[0036] As illustrated in FIG. 2, in which the area A of the ejector 6 in FIG. 1 is shown on an enlarged scale, the ejector roller 7 has a locator groove 20 in which the synthetic rope 4 is located. The locator groove 20 has a flat groove base 21 on which the synthetic rope 4 lies and two lateral inclined groove flanks 22a, 22b. The pressure roller 10 protrudes into the locator groove 20 of the ejector roller 7 and is designed so that the synthetic rope 4 lying on the groove base 21 is pressed by an outside circumferential surface 25 of the pressure roller 10 against the groove base 21 and two lateral and inclined end surfaces 26a, 26b of the pressure roller 10 are in contact with the groove flanks 22a, 22b of the ejector roller 7 for the drive of the pressure roller 10 by the ejector roller 7 driven by the drive motor 12. In the illustrated exemplary embodiment, between the ejector roller 7 and the pressure roller 10, there is a transmission of force between the inclined groove flanks 22a, 22b of the ejector roller 7 and the inclined end surfaces 26a, 26b of the pressure roller 10 for a rotational coupling between the driven ejector roller 7 and the pressure roller 10. Alternatively, between the groove flanks 22a, 22b of the ejector roller 7 and the inclined end surfaces 26a, 26b of the pressure roller, a gearing that is not sensitive to radial tolerances can be provided for the rotational coupling between the driven ejector roller 7 and the pressure roller 10.

[0037] The ejector roller 7 is preferably a steel roller.

[0038] To be able to transmit sufficient axial forces from the pressure roller 10 driven via the ejector roller 7 to the synthetic rope 4 and to achieve a transmission of force for the drive and rotation of the pressure roller 10 by the ejector roller 7 driven by means of the drive motor 12, the external circumferential surface 25 that protrudes into the locator groove 20 and at least the areas of the two end surfaces 26a, 26b of the pressure roller 10 that protrude into the locator groove 20 are provided with a rubberized surface.

[0039] For this purpose, the pressure roller 10 is preferably formed by a steel roller onto which a rubber layer is vulcanized on the outer circumferential surface 25 and the two end surfaces 26a, 26b.

[0040] The ejector roller 10 is also biased toward the ejector roller 7 by means of a bias device 30. In the illustrated exemplary embodiment, the bias device 30 is an adjustable tension spring.

[0041] By means of the bias device 30, the pressure roller 10 is thus biased toward the ejector roller 7 so that the pressure roller 10 is in contact by means of its rubberized outer circumferential surface 25 with the synthetic rope 4 and the synthetic rope 4 is pressed against the groove base 21 of the locator groove 20 of the ejector roller 7, and the end surfaces 26a, 26b of the pressure roller 10 come into contact in areas B1, B2 with the groove flanks 22a, 22b of the ejector roller 7.

[0042] The shape of the locator groove 20 of the ejector roller 7 and the shape of the rubberized outside circumferential surface 25 as well as of the rubberized end surfaces 26a, 26b of the pressure roller 10 are designed so that account is taken of the flattening of the synthetic rope 4 under a tensile load, so that in the areas B1, B2, a transmission of force in the form of a force transmission via the flanks and a flank drive is achieved, with which the pressure roller 10 is rotated and driven by the ejector roller 7 which is driven by means of the drive motor 12, and so that an axial force can be applied to the synthetic rope 4 by the pressure roller 10 driven by means of the rotational coupling by the ejector roller driven 7.

[0043] On the ejector 6 according to the disclosure, therefore, the ejector roller 7 is driven by the drive motor 12, whereby in a first step slipping between the synthetic rope 4 and the ejector roller 7 which is in the form of a steel roller, which causes wear, is reduced by the rubberized outside circumferential surface 25 of the pressure roller 10 which is driven by the rotational coupling, such as the transmission of force by the flanks, for example. The rubberized pressure roller 10, which is driven by the driven ejector roller 7 via the rotational coupling, can thereby indirectly prevent slipping between the ejector roller 7, which is in the form of a steel roller and is driven by the drive motor 12, and the synthetic rope 4, because the pressure roller 10 either moves the synthetic rope 4 along with it or brakes the driven ejector roller 7. The transmission of force and the generation of the axial force on the synthetic rope 4 hereby takes place via the pressure roller 10.

[0044] The ejector 6 with an ejector head 45 is illustrated in greater detail in FIGS. 3 and 4. The pressure roller 10 is not shown in any greater detail in FIGS. 3 and 4.

[0045] The ejector 6 has a bracket 33, with which the ejector 6 can be pivoted around a vertical pivoting axis 31, as illustrated by arrow P1 in FIGS. 3 and 4. The bracket 33 can include a tubular section 32 in which the synthetic rope 4 is guided to the rope drum 3.

[0046] The ejector head 45 forms a rope ejector opening 35 for the synthetic rope 4, which is delimited laterally by two side plates 36a, 36b, between which the ejector roller 7 rotates and the synthetic rope 4 is guided. The side plates 36a, 36b are fastened to the bracket 33.

[0047] The side plates 36a, 36b, which are made of steel, for example, and form the lateral boundaries of the rope ejector opening 35, each have a rounded inner edge 37a, 37b, which form corresponding rounded rope runout edges. With the rounded inner edges 37a, 37b, thus—as shown in FIG. 4—smooth rounded edges on the outer edges of the inner lateral flanks of the two side plates 36a, 36b are achieved, which represent the surfaces that come in contact with the synthetic rope 4 when the synthetic rope 4 is pulled laterally slightly out of the ejector head 45, as illustrated in FIG. 4. When the synthetic rope 4 is pulled laterally slightly out of the rope ejector opening 35 of the ejector head 45, sharp edges that might result in damage to the synthetic rope 4 are eliminated.

[0048] The rope ejector opening 35 formed by the two side plates 36a, 36b is delimited vertically upward by a top limit pin 40 and vertically downward by a bottom limit pin 41. The limit pins 40, 41 are preferably round steel pins which are fastened in the side plates 36a, 36b in a suitable manner.

[0049] In FIG. 3, the synthetic rope 4 is shown in an extreme top position which is delimited by the top limit pin 40, and in an extreme bottom position which is delimited by the bottom limit pin 41, whereby the synthetic rope 4—as indicated by the arrow P2 can be pulled out of the rope ejector opening 35 in any vertical extraction direction between them.

[0050] The side plates 36a, 36b have a circular outside circumferential surface, at least viewed in the circumferential direction, in the area between the two limit pins 40, 41. The outside radius R1 of the side plates 36a, 36b is larger than the outside radius R2 of the ejector roller 7. At least in the area viewed in the circumferential direction between the two limit pins 40, 41, the circular side plates 36a, 36b are provided with rounded inside edges 37a, 37b respectively.

[0051] FIG. 5 shows an ejector with a plurality of pressure rollers 10, 10a, 10b, which are preferably each rotationally coupled with the ejector roller 7 driven by the drive motor 12. The additional pressure roller 10a or 10b preferably has an identical construction to the pressure roller 10 and is biased toward the ejector roller 7 by means of a corresponding bias device 30a or 30b.

[0052] The additional pressure roller 10a or 10b preferably protrudes, analogous to FIG. 2, into the locator groove 20 of the ejector roller 7 and is designed so that the synthetic rope 4 lying on the groove base 21 is pressed by an outer circumferential surface 25 of the pressure roller 10a or 10b against the groove base 21 and two lateral and inclined end surfaces 26a, 26b of the pressure roller 10a or 10b are in contact with the groove flanks 22a, 22b of the ejector roller 7, respectively.

[0053] Furthermore, analogous to the pressure roller 10, the outside circumferential surface 25 that protrudes into the locator groove 20 and at least the areas of the two end surfaces 26a, 26b of the additional pressure roller 10a or 10b that protrude into the locator groove 20 are provided with a rubberized surface, so that analogous to the pressure roller 10, a transmission of force is achieved for the drive of the additional pressure roller 10a or 10b respectively by the ejector roller 7 driven by the drive motor 12. This can be accomplished, for example, analogous to the pressure roller 10 by the flank transmission of force between the groove flanks 22a, 22b of the ejector roller 7 and the end surface 26a, 26b of the additional pressure roller 10a or 10b.

[0054] The additional pressure roller 10a or 10b can have the same diameter as the pressure roller 10. If appropriate for space reasons, the additional press roller 10a or 10b can also be sized with a smaller diameter than the pressure roller 10.

[0055] While the present disclosure has been described in terms of the above detailed description, those of ordinary skill in the art will understand that alterations may be made within the spirit of the disclosure.