Arrangement comprising an ejector and a cord for a forestry winch

Abstract

The invention relates to an arrangement comprising an ejector (6) and a rope (4), in particular steel rope or plastic rope (4a), for a forestry winch (1), wherein the ejector (6) has a rotatable ejector roller (7) over which the rope (4) is guided and deflected, and has at least one driven rotatable pressure roller (10), in particular a pressure roller (10) driven by means of a drive motor (12), wherein the pressure roller (10) presses the rope (4) guided over the ejector roller (7) onto the ejector roller (7) by means of a pressure force (Fspring) and a tangential force (Ftang) occurs between the driven pressure roller (10) and the rope (4), wherein the pressure roller (10) is rotatably arranged on a boom (15) about a pressure roller pivot axis (11), wherein the boom (15) is rotatably mounted about a boom pivot axis (16).The boom pivot axis (16) is arranged in a vertical direction (V) above a line of action (WLT) of the tangential force (Ftang).

Description

[0001] The invention relates to an arrangement comprising an ejector and a cable, in particular a steel cable or plastic cable, for a forestry cable winch, wherein the ejector has a rotatable ejector roller over which the cable is guided and deflected, and at least one driven rotatable pressure roller, in particular a pressure roller driven by a drive motor, wherein the pressure roller presses the cable guided over the ejector roller onto the ejector roller by means of a pressure force and a tangential force occurs between the driven pressure roller and the cable, wherein the pressure roller is arranged on a boom so as to be rotatable about a pressure roller rotation axis, wherein the boom is mounted so as to be rotatable about a boom rotation axis.

[0002] Forestry cable winches are available in versions with a steel cable and a plastic cable.

[0003] In forestry cable winches with a steel cable, it is known to guide the cable on a cable drum of the forestry cable winch over an ejector roller of an ejector, which is actively driven by a drive motor and onto which the cable is pressed by a pressure roller. With the ejector roller driven by the drive motor, a desired axial force and thus cable tension can be applied to the steel cable when lowering the steel cable from the cable drum and when winding it onto the cable drum. This allows for safe and orderly unwinding of the steel cable from the cable drum during lowering and safe and orderly winding of the steel cable onto the cable drum during winding.The axial force applied to the steel cable by the driven ejector roller, and thus the cable tension, allows for low operating forces for an operator who has to pull the steel cable a considerable distance of up to 100 meters when lowering it from the cable drum. However, a disadvantage of forestry cable winches with a steel cable is the high weight of the steel cable, which places high loads on the operator when carrying the steel cable during the unwinding process.

[0004] Furthermore, forestry cable winches with a synthetic cable are already known. A synthetic cable is a woven cable made of a dimensionally unstable, flexible synthetic thread structure, which has the advantage of being lighter than a steel cable. Furthermore, a synthetic cable is robust when wound effortlessly onto the cable drum of the forestry cable winch and allows for smaller deflection radii. A key advantage of forestry cable winches with a synthetic cable compared to forestry cable winches with a steel cable is the significantly reduced weight of the synthetic cable, which results in lower loads for the operator when carrying the synthetic cable when unwinding it.

[0005] However, common ejectors for forestry winches with steel ropes are not suitable for forestry winches with synthetic ropes. Common ejectors for forestry winches with steel ropes are designed for handling a virtually indeformable round steel rope and are not suitable for a flexible, highly deformable synthetic rope that is sensitive to sharp edges.

[0006] WO 2009 / 072992 A2 discloses an ejector for a forestry cable winch with a plastic cable according to the features of the preamble of patent claim 1.

[0007] The present invention is based on the object of providing an ejector for a forestry cable winch which is optimized for a synthetic rope and can apply corresponding forces to a synthetic rope and can eject the synthetic rope gently.

[0008] This object is achieved according to the invention in that the boom rotation axis is arranged in the vertical direction above a line of action of the tangential force.

[0009] According to the invention, the boom rotation axis, around which the boom is rotatably mounted, is arranged vertically above the line of action of the tangential force that occurs between the driven pressure roller and the rope during operation of the ejector. With such an arrangement and position of the boom rotation axis, the tangential force around the boom rotation axis generates a torque with which the pressure roller presses the rope onto the ejector roller in addition to the pressure force, so that the tangential force self-reinforces the pressing effect of the pressure roller. With the arrangement and position of the boom rotation axis according to the invention, high forces can be transmitted to the synthetic rope and the synthetic rope can be ejected gently and in an orderly manner.

[0010] According to an advantageous embodiment of the invention, the pressure roller has a rubberized outer circumferential surface by means of which the pressure roller rests against the cable, wherein the Shore hardness A of the rubberized outer circumferential surface is in the range from 40 to 80, in particular in the range from 55 to 75.

[0011] A Shore hardness A of the rubberized outer circumferential surface of the pressure roller in the range of 40 to 80, in particular in the range of 55 to 75, has the advantage that, on the one hand, a good or high force transmission to the plastic rope is achieved with low flexing forces, whereby high forces can be transmitted to the plastic rope and the plastic rope can be ejected gently and in an orderly manner, and, on the other hand, the rubberized outer circumferential surface of the pressure roller has sufficient elasticity and high strength.

[0012] The ejector roller can be designed as a solid rubber roller or alternatively as a steel wheel onto which the rubberized outer circumferential surface is vulcanized.

[0013] According to an advantageous embodiment of the invention, the line of action of the contact pressure is spaced from the boom rotation axis by a first lever arm and the line of action of the tangential force is spaced from the boom rotation axis by a second lever arm, wherein the ratio of the second lever arm to the first lever arm is in the range from 0.4 to 1.8, in particular in the range from 0.6 to 1.2, preferably in particular in the range from 0.8 to 1.1.

[0014] With such a ratio of the lever arms, on the one hand, a sufficiently high self-reinforcement of the pressing effect of the pressure roller can be achieved in order to be able to transfer high forces to the plastic rope and to be able to eject the plastic rope gently and in an orderly manner, and on the other hand, an excessively high self-reinforcement of the pressing effect of the pressure roller can be avoided, which would lead to high deformations of the rubberized outer circumferential surface of the pressure roller and could lead to damage or failure of the rubberized outer circumferential surface of the pressure roller.

[0015] According to an advantageous embodiment of the invention, the driven pressure roller and the ejector roller are rotationally coupled and a force transmission is formed between the driven pressure roller and the ejector roller for driving the ejector roller by the pressure roller, wherein the pressure roller has at least one rubberized end face by means of which the pressure roller rests against the ejector roller, wherein the Shore hardness A of the rubberized end face is in the range from 40 to 80, in particular in the range from 55 to 75.

[0016] In particular, in an embodiment of the invention in which the rotatable pressure roller is actively driven by a drive motor, it can be achieved that the ejector roller is not rotated and thus driven via the plastic cable, but is rotated and thus driven by means of the force transmission through the pressure roller actively driven by the drive motor, whereby a reliable drive of the ejector roller can be achieved which leads to little wear on the plastic cable and the ejector roller. With a force transmission, a transmission of the ejector roller and thus a drive of the ejector roller can be achieved in a particularly simple embodiment by means of the actively driven pressure roller. For this purpose, the pressure roller preferably has at least one rubberized end face by means of which the pressure roller rests against the ejector roller, wherein the Shore hardness A of the rubberized end face is in the range from 40 to 80, in particular in the range from 55 to 75.With a rubberized front surface, good power transmission values ​​can be easily achieved for force transmission from the pressure roller driven by the drive motor to the ejector roller driven by the pressure roller. A Shore A hardness of the rubberized front surface of the pressure roller in the range of 40 to 80, particularly in the range of 55 to 75, has the advantage of achieving good or high power transmission to the driven ejector roller with low flexing forces, allowing the ejector roller to be reliably rotated and driven by the driven pressure roller, and of ensuring that the rubberized front surface of the pressure roller has sufficient elasticity and high strength.

[0017] According to an advantageous embodiment of the invention, a spring device comprising at least one tension spring is provided to generate the contact pressure force acting on the pressure roller, wherein the spring device is pretensioned such that a contact pressure force in the range between 50N and 500N, in particular in the range between 60N to 400N, preferably in particular between 70N and 300N, is generated on the cable.

[0018] By pre-tensioning the spring device such that a contact pressure in the range between 50N and 500N, in particular in the range between 60N and 400N, preferably in particular between 70N and 300N, is generated on the cable, a sufficient basic pressure of the pressure roller on the cable guided over the ejector roller can be achieved. In the case of a rope designed as a plastic rope, the free rope ends are folded over by 180° and braided into the plastic rope. As a result, a plastic rope has twice the diameter at the areas of the rope ends over a length range of approximately 1m to 2m. A spring device designed as a tension spring is insensitive to these diameter tolerances of a plastic rope at the rope end compared to a spring device designed as a compression spring, if the plastic rope with twice the diameter gets between the ejector roller and the pressure roller.

[0019] According to an advantageous embodiment of the invention, the spring rate of the spring device is in the range between 3 N / mm and 10 N / mm, preferably in the range between 4 N / mm and 8 N / mm, particularly preferably in the range between 5 N / mm and 7 N / mm.

[0020] With such a spring rate of the spring device, particularly when the spring device is designed as a tension spring, a reliable deflection of the pressure roller can be achieved in order to compensate for the diameter tolerances of a plastic rope at the rope end when the plastic rope with twice the diameter comes between the ejector roller and the pressure roller.

[0021] According to an advantageous embodiment of the invention, a limiting device is provided that limits the spring travel of the spring device. Such a limiting device can easily prevent excessive contact forces and thus compressive forces from being exerted on the synthetic rope, which could lead to damage to the synthetic rope, for example, in the event of improper repair or due to operating error.

[0022] According to an advantageous embodiment of the invention, the spring device is attached to an adjusting screw, wherein the adjusting screw is connected to an abutment by means of an adjusting nut, and the adjusting screw is provided with a screw head, wherein the screw head is designed such that the screw head can interact with the abutment to limit the spring travel of the spring device. By the screw head of the adjusting screw being in contact with the abutment, the spring travel and thus the maximum spring force of the spring device can be limited, thus easily preventing excessive contact forces and thus compressive forces from being exerted on the plastic cable.

[0023] According to an advantageous embodiment of the invention, the ejector roller has a receiving groove for the cable, wherein the receiving groove has a groove base, in particular a flat or curved groove base, on which the cable rests, and has two lateral groove flanks, wherein the pressure roller dips into the receiving groove of the ejector roller and the pressure roller is designed to dip into the receiving groove in such a way that the cable is pressed onto the groove base by the rubberized outer circumferential surface of the pressure roller and / or that the rubberized end faces of the pressure roller rest on the groove flanks of the ejector roller.The contour of the ejector roller formed by the receiving groove and the contour of the pressure roller formed by the outer circumferential surface and the end faces of the pressure roller, which dips into the receiving groove, are thus designed in such a way that an increase in the force transmission to the plastic rope, a prevention of rope wear of the plastic rope and an adaptation of the shape to the non-dimensionally stable plastic rope is achieved, which takes into account a design-related flattening of the loaded plastic rope.Such contours and such a shape of the ejector roller and the pressure roller also enable a simple drive of the ejector roller by the pressure roller which is actively driven by the drive motor by means of a force transmission designed as a flank drive between the end faces of the pressure roller and the groove flanks of the ejector roller, so that the ejector roller is not set in motion via the plastic cable but directly by the pressure roller.

[0024] According to an advantageous embodiment of the invention, the boom rotation axis has play around a vertical axis. This makes it easy to ensure that the pressure roller can adjust laterally when engaging the receiving groove of the ejector roller, and thus the pressure roller can align itself relative to the receiving groove of the ejector roller when engaging the receiving groove of the ejector roller in order to compensate for existing tolerances.

[0025] According to an advantageous embodiment of the invention, the rubberized outer circumferential surface of the pressure roller has a width ranging from a factor of 0.5 to a factor of 2.5 of the nominal rope diameter. With such a width of the rubberized outer circumferential surface of the pressure roller, it is possible, on the one hand, to ensure reliable force transmission in the form of flank transmission for driving the ejector roller by the pressure roller driven by the drive motor, and, on the other hand, to limit the surface pressure on the plastic rope to prevent damage to the plastic rope.

[0026] According to an advantageous embodiment of the invention, the ratio of a groove opening width of the receiving groove of the ejector roller to the maximum width of the rubberized outer circumferential surface of the pressure roller is in the range between 0.6 and 2.0, in particular in the range between 0.7 and 1.5. With such a ratio of the groove opening width of the receiving groove of the ejector roller to the maximum width of the rubberized outer circumferential surface of the pressure roller, it is achieved that when the pressure roller immerses itself in the receiving groove of the pressure roller, a secure force is carried in the form of flank carry to drive the ejector roller by the pressure roller driven by the drive motor and a sufficient force is transmitted to the plastic cable, and at the same time it is prevented that the plastic cable can be pulled out of the receiving groove through a gap remaining between the receiving groove and the pressure roller in the event of an oblique cable ejection.

[0027] According to an advantageous embodiment of the invention, the driven pressure roller is arranged on the ejector roller such that an angle of between 0° and 40°, in particular between 10° and 35°, preferably especially between 15° and 30°, occurs between a force application point of the tangential force and a point of ejection of the cable from the ejector roller. This results in a short ejection path of the cable between the force application point of the tangential force and the point of ejection of the cable from the ejector roller. In contrast to a steel cable, a cable constructed as a plastic cable can only be ejected from the ejector over a short distance due to the high flexibility of the plastic cable.By positioning the pressure roller on the ejector roller in such a way that an angle of between 0° and 40°, in particular between 10° and 35°, preferably in particular between 15° and 30°, occurs between a force application point of the tangential force and an ejection point of the rope from the ejector roller, a safe ejection of the plastic rope can be achieved in the case of a rope designed as a plastic rope.

[0028] According to an advantageous embodiment of the invention, the ejector has a rope ejection window for the rope, which is laterally delimited by two side plates between which the rope is guided, wherein the side plates have rounded inner edges as rope outlet roundings and the side plates are each made of a non-metallic material, in particular plastic, for example duroplast. This ensures that the ejector has a rope ejection window suitable for a plastic rope. With the side plates, which have rounded, for example circular segment-shaped, inner edges as rope outlet roundings, sharp edges on the surfaces of the side plates that are tangent to the plastic rope can be easily avoided in the case of a lateral rope outlet and a lateral rope inlet of the plastic rope, thereby preventing wear of the plastic rope in the case of a lateral rope outlet and a lateral rope inlet.The design of the side panels from a non-metallic material, such as plastic, leads to further advantages, since small damages in the side panels, such as scratches or scrapes that can be caused by branches being pulled in, can be easily repaired by the user on site in a forest area.

[0029] The invention further relates to a forestry cable winch having a cable drum driven by a drive motor and an arrangement according to the invention, wherein the cable is guided from the cable drum to the ejector roller and guided over the ejector roller. The ejector according to the invention provides a forestry cable winch that can be used as a felling and / or logging winch and is equipped with a plastic cable. The forestry cable winch has a comfortable cable ejection with low operating forces for pulling the plastic cable when spooling out the plastic cable, has low carrying forces for the operator to carry the plastic cable, and has a good winding quality of the plastic cable on the cable drum.

[0030] According to an advantageous embodiment of the invention, a rope stopper is arranged on the rope, and a rope stopper catcher is arranged in the region of the rope drum, which is designed to interact with the rope stopper. When ejecting the rope, it is known to drive the rope drum and the ejector roller in the unwinding direction. With a rope constructed from a plastic rope, over-rotation of the rope drum may occur at the end of the rope when ejecting the rope. The rope drum, driven in the unwinding direction, winds the plastic rope back onto the rope drum, since a plastic rope, due to its high flexibility, does not create any internal resistance that would prevent the rope drum from over-rotating.With a rope stopper catcher arranged in the area of ​​the rope drum, which interacts with the rope stopper on the rope at the end of the rope, it is easy to prevent the rope drum from over-rotating and the rope from accidentally winding up on the rope drum when the rope is ejected at the end of the rope.

[0031] According to an advantageous embodiment of the invention, the rope stopper is designed as a crimp sleeve, clamping component, or screw part attached to the rope. Using a crimp sleeve, clamping component, or screw part attached to the rope, the rope can be easily provided with a rope stopper.

[0032] According to an advantageous embodiment of the invention, the rope stopper catcher has a receiving groove, in particular a V-shaped receiving groove, into which the rope stopper can be inserted. The rope stopper catcher thus has a receiving groove and is fork-shaped, allowing the rope stopper on the rope to easily and reliably come into contact with the rope stopper catcher, preventing the rope drum from over-rotating at the end of the rope when the rope is ejected.

[0033] According to an advantageous embodiment of the invention, in a stop position, the rope stopper arranged on the rope rests with a lower end face against an upper side of the rope stopper catcher. This allows the rope stopper on the rope to engage with the rope stopper catcher in a simple and safe manner, preventing the rope drum from over-rotating when the rope is ejected at the end of the rope.

[0034] Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiments shown in the schematic figures. Figure 1 shows a forestry cable winch according to the invention in a schematic representation, Figure 2 shows a schematic side view of an ejector arrangement of the Figure 1 , Figure 3 a view according to the Figure 2 with clarification of the lever ratios and forces, Figure 4 a front view according to arrow Y of the Figure 2 , Figure 5 a spring device pressing the pressure roller in a schematic representation, Figures 6a, 6b side views of the cable drum at the end of the cable when unwinding the cable, Figure 7 a section of the Figure 6 in a plan view, Figure 8 a constructive design of an ejector arrangement in a side view, Figure 9 a front view according to arrow X in the Figure 8 .

[0035] In the Figure 1A forestry cable winch 1 according to the invention is shown in a schematic representation. Figure 1 shows a front view of the forestry cable winch 1 according to the invention.

[0036] The forestry cable winch 1 has a cable drum 3 driven by a drive motor 2, on which, in the illustrated embodiment, a cable 4 embodied as a plastic cable 4a is wound. The cable drum 3 is arranged to rotate about a rotation axis 5 and is driven by the drive motor 2. The drive motor 2 can be designed, for example, as a hydraulic motor or an electric motor.

[0037] The forestry cable winch 1 further comprises an ejector arrangement which comprises an ejector 6 and the cable 4 designed as a plastic cable 4a.

[0038] The ejector 6 has an ejector roller 7 which is arranged to rotate about a rotation axis 8.

[0039] The plastic rope 4a 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 at the ejector roller 7 in such a way that the rope 4 is guided away from the ejector roller 7 in the horizontal direction.

[0040] The ejector 6 further comprises a pressure roller 10 which is arranged to rotate about a pressure roller rotation axis 11 and by means of which the plastic cable 4a is pressed onto the ejector roller 7.

[0041] The pressure roller 10 is actively driven by a drive motor 12. The drive motor 12 can be designed, for example, as a hydraulic motor or electric motor.

[0042] As in connection with the Figures 2 and 3As can be seen in more detail, the ejector roller 7 is arranged in a holder 9 so as to be rotatable about the rotation axis 8. In the illustrated embodiment, the holder 9 is provided with a pin 9a which is arranged so as to be rotatable about a vertical pivot axis VS.

[0043] The pressure roller 10 is mounted on a boom 15 for rotation about the pressure roller rotation axis 11. The boom 15 is mounted on the holder 9 for rotation about a boom rotation axis 16.

[0044] The rotation axis 8 of the ejector roller 7, the pressure roller rotation axis 11 of the pressure roller 10 and the boom rotation axis 16 of the boom 15 are preferably parallel to each other and each designed as horizontal axes.

[0045] In the Figure 3 The ejector arrangement is shown in a representation according to the Figure 2 , illustrating the forces occurring during operation.

[0046] In the Figure 3the operating state of the rope ejection is shown, wherein the pressure roller 10 is driven by the drive motor 12 according to the arrow P1 clockwise in a rope ejection direction and the plastic rope 4a is unwound from the rope drum 3 and ejected in the direction of the arrow P2 at the ejector 6.

[0047] The pressure roller 11 presses the plastic cable 4a guided over the ejector roller 7 onto the ejector roller 7 by means of a pressure force F spring. To generate the pressure force F spring, as can be seen from the Figure 1 can be seen - a spring device 30 comprising at least one tension spring 30a is provided.

[0048] A tangential force F tang occurs between the pressure roller 10, which is driven by the drive motor 12 clockwise according to arrow P1 in a rope ejection direction, and the plastic rope 4a. The tangential force F tang acts at a contact point BP at which the pressure roller 10 rests against the plastic rope 4a. The contact point BP lies on a connecting line VL connecting the rotational axis 8 of the ejector roller 7 with the pressure roller rotational axis 11 of the pressure roller 10. The tangential force F tang has an action line WLT which is perpendicular to the connecting line VL at the contact point BP. The tangential force F tang has a force direction pointing towards the side of the boom rotational axis 16.

[0049] The effective line WLF of the contact force F spring corresponds to the connecting line VL.

[0050] In the ejector arrangement according to the invention, the boom rotation axis 16 of the boom 15 is arranged in the vertical direction V above and thus above the line of action WL of the tangential force F tang.

[0051] As from the Figure 3 As can be seen, the effective line WLF of the contact force F spring is spaced from the boom rotation axis 16 by a first lever arm H1. The effective line WLT of the tangential force F tang is spaced from the boom rotation axis 16 by a second lever arm H2. The first lever arm H1 is the vertical distance of the effective line WLF from the boom rotation axis 16. The second lever arm H2 is the vertical distance of the effective line WLT from the boom rotation axis 16.

[0052] Due to the position of the boom rotation axis 16 of the boom 15 in the vertical direction V above and thus above the line of action WLT of the tangential force F tang , the tangential force F tang with the second lever arm H2 generates a torque around the boom rotation axis 16 that corresponds to the force F lever lying in the line of action WLF with the lever arm H1. The tangential force F tang lying in the line of action WLT thus generates the force F lever lying in the line of action WLF, which amplifies the contact force F spring.

[0053] Due to the position of the boom rotation axis 16 of the boom 15 in the vertical direction V above and thus above the line of action WLT of the tangential force F tang, a self-reinforcing of the pressing effect of the pressure roller 10 is achieved with the tangential force F tang.

[0054] The ratio H2 / H1 of the second lever arm H2 to the first lever arm H1 is in the range from 0.4 to 1.8, in particular in the range from 0.6 to 1.2, preferably in particular in the range from 0.8 to 1.1.

[0055] As from the Figure 4 can be seen, in which a front view of the Figure 2As shown according to arrow Y, the ejector roller 7 has a receiving groove 20 in which the plastic cable 4a is arranged. The receiving groove 20 has a flat or curved groove base 21 on which the plastic cable 4a rests, and two lateral inclined groove flanks 22a, 22b. The pressure roller 10, driven by the drive motor 12, dips into the receiving groove 20 of the ejector roller 7 and is designed such that the plastic cable 4a resting on the groove base 21 is pressed onto the groove base 21 by an outer peripheral surface 25 of the pressure roller 10 and that two lateral and inclined end faces 26a, 26b of the pressure roller 10 rest on the groove flanks 22a, 22b of the ejector roller 7 for driving the ejector roller 7 by the pressure roller 10.In the illustrated embodiment, a force transmission designed as a flank drive is formed between the pressure roller 10 and the ejector roller 7 between the inclined end faces 26a, 26b of the pressure roller 10 and the groove flanks 22a, 22b of the ejector roller 7 for a rotary coupling between the pressure roller 10 driven by the drive motor 12 and the ejector roller 7, so that the ejector roller 7 is driven by the pressure roller 10 driven by the drive motor 12.

[0056] The outer peripheral surface 25, with which the pressure roller 10 rests against the plastic cable 4a, is designed as a rubberized outer peripheral surface.

[0057] The end faces 26a, 26b, with which the pressure roller 10 rests against the groove flanks 22a, 22b of the ejector roller 7, are designed as rubberized end faces.

[0058] Due to the contact pressure force F spring generated by the spring device 30 and the force F lever resulting from the tangential force F tang , the contact pressure roller 10 is pretensioned in the direction of the ejector roller 7 and pressed into the receiving groove 20 of the ejector roller 7 in such a way that the contact pressure roller 10 is in contact with the plastic cable 4a via the rubberized outer circumferential surface 25 and the plastic cable 4a is pressed by the rubberized outer circumferential surface 25 onto the groove base 21 of the receiving groove 20 of the ejector roller 7 and that the rubberized end surfaces 26a, 26b of the contact pressure roller 10 come into contact with the groove flanks 22a, 22b of the ejector roller 7 and rest against the groove flanks 22a, 22b of the ejector roller 7.

[0059] In order to be able to transmit sufficient axial forces from the pressure roller 10 driven by the drive motor 12 to the plastic cable 4 and to achieve a force transmission for driving and rotating the ejector roller 7 by the pressure roller 10 driven by the drive motor 12, the outer circumferential surface 25 immersed in the receiving groove 20 and the areas of the two end faces 26a, 26b of the pressure roller 10 immersed in the receiving groove 20 are provided with a rubberized surface.

[0060] The shape of the receiving groove 20 of the ejector roller 7 and the shape of the rubberized outer circumferential surface 25 as well as the rubberized end faces 26a, 26b of the pressure roller 10 is such that the flattening of the plastic cable 4a under a tensile load is taken into account, so that a force ejecting the plastic cable 4a can be applied by the driven pressure roller 10 via the outer circumferential surface 25 and a force transmission in the form of a flank transmission and a flank drive is achieved between the end faces 26a, 26b and the groove flanks 22a, 22b of the receiving groove 20, with which the ejector roller 7 is rotated and driven by the driven pressure roller 10.

[0061] For this purpose, the pressure roller 10 is preferably formed by a steel roller onto which a rubber layer is vulcanized, which forms the two end surfaces 26a, 26b and the outer peripheral surface 25.

[0062] The Shore hardness A of the rubberized outer peripheral surface 25 and the Shore hardness A of the rubberized end surface 26a, 26b is each in the range of 40 to 80, in particular in the range of 55 to 75.

[0063] The spring device 30, which comprises at least one tension spring 30a and is provided for generating the contact force F spring, is pretensioned such that a contact force F spring in the range between 50N and 500N, in particular in the range between 60N and 400N, preferably in particular between 70N and 300N, is generated on the plastic cable 4a. The spring rate of the spring device is in the range between 3 N / mm and 10 N / mm, preferably in the range between 4 N / mm and 8 N / mm, particularly preferably in the range between 5 N / mm and 7 N / mm.

[0064] In the Figure 5 a limiting device 40 is shown with which the spring travel of the spring device 30 can be limited.

[0065] The spring device 30, designed as a tension spring 30a, is connected by a first spring end to the boom 15 at a distance from its boom rotation axis 16. The tension spring 30a is connected by a second spring end to a screw head 31 of an adjusting screw 32. The adjusting screw 32 is connected by means of an adjusting nut 33 to an abutment 34, which is arranged or fastened to the holder 9 of the ejector roller 7. The screw head 31 can strike the abutment 34, whereby the spring travel of the spring device 30 is limited to the Figure 5 shown dimension ΔX is limited.

[0066] The boom rotation axis 16 is preferably formed by a horizontal pin arranged on the holder 9, on which the boom 15 is rotatably mounted by means of a sleeve. The boom rotation axis 16 preferably has a certain amount of play around the vertical axis V. For this purpose, the inner diameter of the sleeve can be slightly larger than the outer diameter of the horizontal pin.

[0067] The rubberized outer circumferential surface 25 of the pressure roller 11 has - as shown in the Figure 4 shown - has a width B. The width B is preferably in the range of a factor of 0.5 to a factor of 2.5 of the nominal diameter of the plastic rope 4a.

[0068] In the Figure 4Furthermore, a groove opening width N of the receiving groove 20 of the ejector roller 7 is shown and a maximum width B max of the rubberized outer peripheral surface 25. The maximum width B max of the rubberized outer peripheral surface 25 is the width dimension of the rubberized outer peripheral surface 25 at the radially inner end regions of the two rubberized end surfaces 26a, 26b.

[0069] The ratio of a groove opening width N of the receiving groove 20 of the ejector roller 7 to the maximum width B max of the rubberized outer circumferential surface 25 of the pressure roller 10 is in the range between 0.6 to 2.0, in particular in the range between 0.7 to 1.5.

[0070] In the Figure 2Also shown is the contact point BP, which corresponds to the point of application of the tangential force F tang, and an ejection point AS of the plastic rope 4a, at which the plastic rope 4a lifts off the ejector roller 7 when the rope is ejected. The driven pressure roller 10 is arranged on the ejector roller 7 in such a way that an angle α between 0° and 40°, in particular between 10° and 35°, preferably in particular between 15° and 30°, occurs between the point of application of the force (contact point BP) of the tangential force F tang and the ejection point AS of the plastic rope 4a from the ejector roller 7. The angle α is measured as the angle of rotation around the axis of rotation 8 of the ejector roller 7.

[0071] In the Figures 8 and 9 A structural embodiment of the ejector arrangement according to the invention is shown, with the Figures 1 to 7 identical components are provided with the same reference numbers. Figures 8 and 9In particular, the design of the boom 15 is shown in more detail, which is arranged on the holder 9 so as to be rotatable about the boom rotation axis 16. Furthermore, the pin 9a of the holder 9 is shown in more detail. Furthermore, the design of the spring device 30 with two tension springs 30a, 30b on opposite sides of the ejector roller 7 is shown in more detail. Figures 8 , 9 the articulation of the spring device 30, designed as tension springs 30a, on the boom 15 at a distance from its boom rotation axis 16 and connected to the screw head 31 of the adjusting screw 32, as well as the adjusting nut 33 and the abutment 34 arranged on the holder 9, against which the screw head 31 can strike.

[0072] In the Figures 8 , 9Also shown is a cable ejector window 45 for the plastic cable 4a, which is laterally delimited by two side plates 36a, 36b, between which the ejector roller 7 is rotatably arranged and the plastic cable 4a is guided. The side plates 36a, 36b are attached to the holder 9.

[0073] The two side plates 36a, 36b are made of a non-metallic material, in particular plastic, for example, duroplast, and each have a rounded inner edge 37a, 37b, which forms corresponding cable outlet curves. The rounded inner edges 37a, 37b create gentle curves on the outer edges of the inner side flanks of the two side plates 36a, 36b, which represent surfaces tangent to the plastic cable 4a when the plastic cable 4a is pulled slightly sideways out of the ejector roller 7. When the plastic cable 4a is pulled slightly sideways out of the cable ejector window 45, sharp edges that could damage the plastic cable 4a are thus avoided.

[0074] From the Figure 8 The arrangement of the tension springs 30a, 30b is also shown in more detail.

[0075] The tension springs 30a, 30b are arranged such that the tension springs 30a, 30b each have an effective direction WR that is substantially perpendicular to the connecting line VL connecting the rotational axis 8 of the ejector roller 7 with the pressure roller rotational axis 11 of the pressure roller 10. For the purposes of the invention, an angular range between 70° and 110° is considered to be substantially perpendicular.

[0076] With such an arrangement of the effective direction WR of the tension springs 30a, 30b, advantages are achieved when the plastic rope 4a at the rope end with twice the diameter passes between the ejector roller 7 and the pressure roller 10, since the change in thickness of the plastic rope 4a at the rope end and a concomitant movement of the boom 15 results in a slight change in the force of the tension springs 30a, 30b.

[0077] In the Figures 6a , 6b and 7 the cable drum 3 of a forestry cable winch 1 according to the invention is shown in more detail.

[0078] A rope stopper 70 is arranged on the plastic rope 4a at a distance from the rope end of the plastic rope 4a fastened to the rope drum 3. A rope stopper catcher 71 is arranged in the area of ​​the rope drum 3 and is designed to interact with the rope stopper 70. The plastic rope 4a is fastened to the rope drum 3 at the rope end by a fastening device 72. In the illustrated embodiment, the rope stopper catcher 71 is formed on a holder 73, which is arranged in the vertical direction V above the rope drum 3 between the rope drum 3 and the ejector 6.

[0079] The rope stopper 70 is preferably designed as a crimp sleeve or clamping component or screw part attached to the plastic rope 4a.

[0080] The rope stopper catcher 71 has - as can be seen from the Figure 7can be seen - a receiving groove 75 with a V-shaped receiving bevel 76 into which the plastic cable 4a and the cable stopper 70 can be inserted.

[0081] In a stop position, the rope stopper 70 arranged on the plastic rope 4a is - as can be seen from the Figure 6b as can be seen - with a lower end face on an upper side of the rope stopper catcher 71 in the appendix. For this purpose, the diameter d of the rope stopper 70 is designed to be larger than the groove width W of the receiving groove 75.

[0082] With the rope stopper 70 and the rope stopper catcher 71, over-rotation of the rope drum 3 can be avoided when ejecting the plastic rope 4a at the rope end of the plastic rope 4a.

[0083] If according to the Figure 6a When the rope is ejected, the rope drum 3 is rotated in the unwinding direction according to arrow P5, at the end of the rope the rope drum 3 reaches the rotation position of the Figure 6a. Since the plastic rope 4a, due to its high flexibility and high pliability, does not offer any resistance to the further rotation of the rope drum 3, the rope drum 3 - as shown in the Figure 6b can be seen - further rotated in the unwinding direction according to arrow P5. The plastic rope 4a with the rope stopper 70 enters the receiving groove 75 of the rope stopper catcher 71, whereby the rope stopper 70 comes into contact with the upper side of the rope stopper catcher 71 with its lower end face, as shown in the Figure 6b The V-shaped receiving bevel 76 ensures the threading of the rope stopper 70 into the receiving groove 75. In the stop position of the Figure 6b the rotational movement of the cable drum 3 in the direction of arrow P5 and over-rotation of the cable drum 3 can be prevented.

Claims

1. Arrangement comprising an ejector (6) and a cable (4), in particular a steel cable or plastic cable (4a), for a forestry cable winch (1), wherein the ejector (6) has a rotatable ejector roller (7) over which the cable (4) is guided and deflected, and at least one driven rotatable pressure roller (10), in particular a pressure roller (10) driven by a drive motor (12), wherein the pressure roller (10) is driven by means of a pressure force (F Feder ) presses the cable (4) guided over the ejector roller (7) onto the ejector roller (7) and a tangential force (F tang ), wherein the pressure roller (10) is arranged on a boom (15) so as to be rotatable about a pressure roller rotation axis (11), wherein the boom (15) is mounted so as to be rotatable about a boom rotation axis (16), characterized in that the boom rotation axis (16) in the vertical direction (V) above a line of action (WLT) of the tangential force (F tang) is arranged.

2. Arrangement according to claim 1, characterized in that the pressure roller (10) has a rubberized outer peripheral surface (25) by means of which the pressure roller (10) rests against the cable (4), wherein the Shore hardness A of the rubberized outer peripheral surface (25) is in the range from 40 to 80, in particular in the range from 55 to 75.

3. Arrangement according to claim 1 or 2, characterized in that a line of action (WLF) of the contact force (F Feder ) is spaced from the boom rotation axis (16) by a first lever arm (H1) and the line of action (WLT) of the tangential force (F tang ) is spaced from the boom rotation axis (16) by a second lever arm (H2), wherein the ratio (H2 / H1) of the second lever arm (H2) to the first lever arm (H1) is in the range from 0.4 to 1.8, in particular in the range from 0.6 to 1.2, preferably in particular in the range from 0.8 to 1.

1.

4. Arrangement according to one of claims 1 to 3, characterized in thatthe driven pressure roller (10) and the ejector roller (7) are rotationally coupled and a force transmission is formed between the driven pressure roller (10) and the ejector roller (7) for driving the ejector roller (7) by the pressure roller (10), wherein the pressure roller (10) has at least one rubberized end face (26a, 26b) by means of which the pressure roller (10) bears against the ejector roller (7), wherein the Shore hardness A of the rubberized end face (26a, 26b) is in the range from 40 to 80, in particular in the range from 55 to 75.

5. Arrangement according to one of claims 1 to 4, characterized in that to generate the contact force (F Feder ) a spring device (30) comprising at least one tension spring (30a, 30b) is provided, wherein the spring device (30) is pretensioned such that a contact force in the range between 50N and 500N, in particular in the range between 60N to 400N, preferably in particular between 70N and 300N, is generated on the cable (4).

6. Arrangement according to claim 5, characterized in that the spring rate of the spring device (30) is in the range between 3 N / mm and 10 N / mm, preferably in the range between 4 N / mm and 8 N / mm, particularly preferably in the range between 5 N / mm and 7 N / mm.

7. Arrangement according to claim 5 or 6, characterized in that a limiting device (40) is provided which limits the spring travel of the spring device (30).

8. Arrangement according to claim 7, characterized in that the spring device (30) is fastened to an adjusting screw (32), wherein the adjusting screw (32) is connected to an abutment (34) by means of an adjusting nut (33), and the adjusting screw (32) is provided with a screw head (31), wherein the screw head (31) is designed to cooperate with the abutment (34) to limit the spring travel of the spring device (30).

9. Arrangement according to one of claims 4 to 8, characterized in thatthe ejector roller (7) has a receiving groove (20) for the cable (4), wherein the receiving groove (20) has a groove base (21), in particular a flat or curved groove base, on which the cable (4) rests, and has two lateral groove flanks (22a, 22b), wherein the pressure roller (10) dips into the receiving groove (20) of the ejector roller (7) and the pressure roller (10) is designed to dip into the receiving groove (20) in such a way that the cable (4) is pressed onto the groove base (21) by the rubberized outer circumferential surface (25) of the pressure roller (10) and / or that the rubberized end faces (26, 26b) of the pressure roller (10) rest against the groove flanks (22a, 22b) of the ejector roller (10).

10. Arrangement according to one of claims 1 to 9, characterized in that the boom rotation axis (16) has a play around a vertical axis (V).

11. Arrangement according to one of claims 2 to 10, characterized in thatthe rubberized outer circumferential surface (25) of the pressure roller (10) has a width (B) in the range of a factor of 0.5 to a factor of 2.5 of the nominal rope diameter.

12. Arrangement according to one of claims 9 to 11, characterized in that the ratio of a groove opening width (N) of the receiving groove (20) of the ejector roller (7) to the maximum width (B max ) of the rubberized outer peripheral surface (25) of the pressure roller (10) is in the range between 0.6 to 2.0, in particular in the range between 0.7 to 1.

5.

13. Arrangement according to one of claims 1 to 12, characterized in that the driven pressure roller (10) is arranged on the ejector roller (7) in such a way that between a force application point (BP) of the tangential force (F tang ) and an ejection point (AS) of the rope (4) from the ejector roller (7) an angle (α) between 0° and 40°, in particular between 10° and 35°, preferably in particular between 15° and 30° occurs.

14. Arrangement according to one of claims 1 to 13, characterized in that the ejector (6) has a cable ejector window (45) for the cable (4), which is laterally delimited by two side plates (36a, 36b) between which the cable (4) is guided, wherein the side plates (36a, 36b) have rounded inner edges (37a, 37b) as cable outlet roundings and the side plates (36a, 36b) each consist of non-metallic material, in particular plastic.

15. Forestry cable winch (1) having a cable drum (3) driven by a drive motor (2) and an arrangement according to one of claims 1 to 14, wherein the cable (4) is guided from the cable drum (3) to the ejector roller (7) and is guided over the ejector roller (7).

16. Forestry cable winch according to claim 15, characterized in that a rope stopper (70) is arranged on the rope (4) and a rope stopper catcher (71) is arranged in the region of the rope drum (3), which is designed to interact with the rope stopper (70).

17. Forestry cable winch according to claim 16, characterized in that the rope stopper (71) is designed as a crimp sleeve or clamping component or screw part attached to the rope (4).

18. Forestry cable winch according to claim 16 or 17, characterized in that the rope stopper catcher (71) has a receiving groove (75), in particular a V-shaped receiving groove (76), into which the rope stopper (70) can be inserted.

19. Forestry cable winch according to one of claims 16 to 18, characterized in that in a stop position, the rope stopper (70) arranged on the rope (4) rests with a lower end face on an upper side of the rope stopper catcher (71).

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