FEED ROLLER ASSEMBLY

Abstract

A feed roller assembly of a harvester head of a forestry machine includes a pivoted arm operated by a hydraulic cylinder and a feed roller and one operating device attached to the pivoted arm having an attachment hub driving the feed roller, the feed roller includes at least one attachment flange, at least two toothed discs, spacer pieces between at least the attachment flange and the toothed discs, attachment bolts connecting the attachment flange, the toothed discs, and the spacer pieces to form the feed roller as a bolted construction, and a cleaning comb attached to the arm for cleaning gaps formed between each pair of components when the feed roller is rotating.

Claims

1. Feed roller assembly of a harvester head of a forestry machine, the feed roller assembly comprising a pivoted arm operated by a hydraulic cylinder and a feed roller having a first end and a second end and one operating device attached to the pivoted arm having an attachment hub driving the feed roller connected to the attachment hub from the first end and leaving the second end, which is opposite to the attachment hub, exposed to open space, the feed roller comprising at least one attachment flange attaching the said feed roller to the attachment hub of the operating device, at least two toothed discs having an opening in the center of the toothed discs for fitting the attachment hub partly through the toothed disc, which said toothed discs are arranged to act as gripping surfaces against a tree, wherein the attachment flange and the toothed discs each have 6-12 guide holes placed circumferentially around the attachment hub, spacer pieces between at least the attachment flange and the toothed discs, attachment bolts connecting the attachment flange, the toothed discs, and the spacer pieces to form the feed roller as a bolted construction, wherein the attachment bolts are arranged through the guide holes of both the attachment flange and the toothed discs as well as the spacer pieces securing the attachment flange, the toothed discs and the spacer pieces to each other, and a cleaning comb attached to the arm for cleaning gaps formed between each pair of components when the feed roller is rotating, the components being the attachment flange and the toothed discs.

2. Feed roller assembly according to claim 1, wherein at least one of said toothed discs and the attachment flange are manufactured by laser cutting from steel.

3. Feed roller assembly according to claim 2, wherein the strength of steel used in said toothed discs and the attachment flange is 1200-2000 N/mm.sup.2.

4. Feed roller assembly according to claim 1, wherein the said toothed disc comprising toothing, which is symmetrical independently of the direction of rotation of the toothed disc.

5. Feed roller assembly according to claim 1, wherein in the feed roller assembly the feed roller include 3-9 toothed discs.

6. Feed roller assembly according to claim 1, wherein in the feed roller assembly the feed roller include 3-6 toothed discs.

7. Feed roller assembly according to claim 1, wherein the attachment flange comprising toothing.

8. Feed roller assembly according to claim 1, wherein the toothing comprising individual teeth.

9. Feed roller assembly according to claim 1, wherein the toothed discs are located in the assembly of the feed roller asymmetrically on each side of an attachment flange.

10. Feed roller assembly according to claim 1, wherein the attachment flange comprising a guide hole for aligning the attachment flange and the toothed discs relative to each other with the aid of the said spacer pieces.

11. Feed roller assembly according to claim 1, wherein a center hole and attachment holes are machined in the attachment flange, for attaching the feed roller to the operating device.

12. Feed roller assembly according to claim 18, wherein at least one of the attachment flange and the toothed discs are manufactured from an alloyed steel, which is heat treated in order to improve the steel's heat resistance and strength, which steel is alloyed with the following substances: Cr, Ni, Mo, C, Mn.

13. Feed roller assembly according to claim 1, wherein the said spacer pieces are sleeves, in which a shoulder is machined.

14. Feed roller assembly according to claim 1, wherein the spacer pieces are discs, in which there are shoulders.

15. Feed roller assembly according to claim 1, wherein a further toothed disc is attached to the sides of the feed roller, to which studding or widening parts are attached as widenings, in order to prevent the tree from falling off the feed roller.

16. Feed roller assembly according to claim 1, wherein the feed roller assembly further comprising a feed-roller guard, to which the said cleaning comb is attached.

17. Feed roller assembly according to claim 2, wherein the strength of steel used in said toothed discs and the attachment flange is 1500-2000 N/mm.sup.2.

18. Feed roller assembly according to claim 1, wherein location of each toothed disc is fixed in relation to the hub in radial direction of the hub.

19. Feed roller assembly according to claim 1, wherein diameter of each toothed disc and the attachment flange is larger than diameter of the hub.

20. Feed roller assembly according to claim 1, wherein each toothed disc is a uniform piece made of a single piece of metal.

21. Feed roller assembly according to claim 8, wherein in each tooth there is a spike for gripping the tree and a shoulder for limiting the bite of the spike.

22. Feed roller assembly according to claim 21, wherein the spike is an integrated part of each toothed disc.

23. Feed roller assembly according to claim 1, wherein each toothed disc is separated from another said toothed disc by the spacer pieces.

24. Feed roller assembly according to claim 1, wherein the cleaning comb has a body and comb flanges attached to the body, each comb flange extending in the gap between the toothed discs.

25. Feed roller assembly according to claim 24, wherein each comb flange has an end and each comb flange extends in the gap so that the end of the comb flange is at a distance of 5-10 mm from the spacer piece when the spacer piece is at a line drawn between the hub and the end of the comb flange.

26. Feed roller assembly according to claim 25, comprising a second arm attached to the pivoted arm to which second arm the cleaning comb is fixedly attached.

27. Feed roller assembly according to claim 8, wherein the each tooth has an offset in the tangential direction of the toothed disc in relation to the guide hole.

28. Feed roller assembly according to claim 27, wherein the offset is - of the tangential distance between neighboring teeth.

29. Feed roller assembly according to claim 27, wherein the offset is a quarter of the tangential distance between neighboring teeth.

30. Feed roller assembly according to claim 1, wherein spacer pieces are between each pair of components.

31. Feed roller assembly according to claim 1, wherein the gap between each component created by the spacer pieces is 10-35 mm, preferably 12-24 mm.

32. Feed roller assembly according to claim 1, wherein length of the pivoted arm is 50-200% of diameter of the feed roller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In the following, the invention is described in detail with reference to the accompanying drawings showing some embodiments of the invention, in which

[0062] FIG. 1 shows a side view of the feed roller assembly according to the invention,

[0063] FIG. 2 shows the feed roller assembly according to the invention attached to a harvester head in its working position,

[0064] FIG. 3 shows an exploded view of the construction of the feed roller assembly according to the invention,

[0065] FIG. 4 shows the construction of the attachment flange of the feed roller assembly according to the invention,

[0066] FIG. 5 shows the construction of the toothed disc of the feed roller assembly according to the invention,

[0067] FIG. 6 shows the attachment of the toothed disc and attachment flange of the feed roller assembly according to the invention, seen parallel the longitudinal axis of the feed roller,

[0068] FIG. 7 shows a side view of the feed roller assembly according to the invention in use,

[0069] FIG. 8 shows a top view of the feed roller assembly according to the invention in use, and

[0070] FIG. 9 shows a second embodiment of the feed roller with the cleaning comb.

DETAILED DESCRIPTION OF THE INVENTION

[0071] FIG. 1 shows the construction of the feed roller 1 according to the invention, which comprises one or several attachment flanges 2 and one or several toothed discs 3. The toothed discs 3 are attached to the attachment flange 2 using spacer pieces 4 and attachment means 17, i.e. in this case attachment bolts 15 and counter-nuts 6, as the joining elements. In this connection, it should be understood that at least one toothed disc 3 is attached to the attachment flange 2, to which said toothed disc 3 the other toothed discs 3 can be attached. The toothed discs 3 are attached to the attachment flange 2 of the feed roller 1 in such a way that a feed roller 1 is assembled, in which there are toothed discs 3 relative to the attachment flange 2 in such a way that the feed roller 1 is located correctly to the power-transmission shaft, or the hub 22 of the operating device.

[0072] FIG. 2 illustrates the feed roller assembly according to the invention as a part of a harvester head 62. In this illustrative embodiment the harvester head 62 is hung from a boom 54 of a work machine using a pivot 56 of a rotating device 58 and a wide-angle pivot 60. The harvester head 62 comprises a frame 64, delimbing arms 68, cutting device 66 and the feed roller assembly according to the invention. The feed roller assembly includes an pivoted arm 70, which is attached to the frame 64 of the harvester heads 62, a feed roller 1 for feeding the tree 50 to the cutting device 66 as well as an operating device 55 having a hub 22 for rotating the feed roller 1. The pivoted arm 70 is operated by a hydraulic cylinder 74 pivoted between the frame 64 of the harvester head 62 and the pivoted arm 70. The feed roller 1 is attached to the hub 22 of the operating device 55. In FIG. 1 the harvester head 62 is in its operating position where it delimbs the tree and cuts it into logs.

[0073] According to FIG. 1, the feed roller assembly includes cleaning comb 24 for cleaning tree bark from the gaps between the toothed discs 3 and the attachment flange 2. Because the toothed discs 3 and the attachment flange 2 are arranged with a small gap between them with the aid of the spacer pieces 4, space remains between the adjacent toothed discs 3 and the toothed disc 3 and attachment flange 2. When using the feed roller to move a tree, the toothing of the toothed discs bites into the tree, when the bark of the tree enters this aforementioned space. Bark remaining in this space can finally become packed against the surface of the spacer pieces, preventing the toothing 7 from biting effectively into the bark of the tree. According to FIG. 1, the cleaning comb 24, which includes individual comb flanges 30. The comb flanges are shaped in such a way as to conform in shape to the annular path of the spacer pieces when the feed roller rotates. In other words, viewed parallel to the rotational axis of the feed roller, the surface of the comb flanges closest to the spacer pieces of the feed roller is the same shape as the line of rotation of the feed roller. Thus, the comb flanges are the same distance from the surface of the spacer pieces over the entire length of the comb flange.

[0074] The cleaning comb 24 is preferably attached via a second arm to the pivoted arm 70 of the feed roller assembly. The second arm is preferably a feed-roller guard 28 shown in FIG. 1, which is generally always a permanent component of the feed roller. The guard 28 is intended to protect the feed roller from impacts. The cleaning comb 24 can be attached with the aid of bolts 26, which at the same time attach the comb flanges 30 to the guard 28. The comb flanges 30 act like the teeth of a comb between the toothed discs 3, which by remaining stationary remove tree bark and other rubbish that has adhered between the rotating toothed discs. FIG. 1 uses broken lines to show the hub 22 of the operating device.

[0075] FIG. 3 shows an axonometric exploded view of the assembly of the attachment flange 2, the toothed discs 3, and the spacer pieces 4 of the feed roller 1, to form a unified structure with the aid of attachment bolts 15, support sleeves 16, and counter-nuts 6. According to FIG. 3, the attachment flange 2, the toothed discs 3, and the spacer pieces 4 together form a pack of toothed discs, which is the feed roller 1. The spacer pieces 4 are attached with the aid of the toothed discs 3 and the shoulders 13 of the attachment flange, which prevent the spacer pieces moving in the direction of the plane of an individual toothed disc.

[0076] According to FIG. 3, toothing 7, which is formed of individual teeth 7, is preferably formed in the attachment flange 2 of the feed roller 1 of the assembly according to the invention. In order to create a good grip, sharp spike 8 and a widened tooth shoulder 9 are shaped in each individual tooth 7. The spike can also be referred to as a point and the shoulder of the tooth as the base part of the tooth. A hub hole 10 and attachment holes 11 are made in the attachment flange 2, according to the hub of the drive shaft or motor. In addition, the attachment flange 2 can include guide holes 12 arranged in the shoulders 13 of the spacer pieces 4.

[0077] According to FIG. 3, the feed roller includes one or several toothed discs 3, which are attached to the attachment flange 2 with the aid of spacer pieces 4, in such a way that the shoulder 13 of the spacer piece 4 is located in the guide holes 14 of the toothed discs 3. In the toothed discs 3, there can be the same kind of toothing 7 as in the attachment flange 2. An opening 19 is made in the middle of the toothed disc 3, which is dimensioned in such a way that the hub of the drive device fits inside the opening 19. According to FIGS. 4 and 5, both the disc 3 and the attachment flange 2 can include lightening openings 20.

[0078] FIG. 6 shows in greater detail the attachment of the toothed disc 3 and the attachment flange 2 to each other, parallel to the axis of rotation of the feed roller. The hub of the operating device is attached to the attachment flange 2 with the aid of attachment holes 11. According to the figure, the opening 19 in the toothed disc 3 permits the hub of the operating device to pass through the toothed disc. According to FIG. 6, the attachment flange 2 too can include toothing, which is preferably stepped differently relative to the toothed disc, in order to improve grip. Alternatively, the attachment flange can also be made without toothing.

[0079] FIG. 7 shows the feed roller assembly according to the invention in its use position. The feed roller assembly 1 is used for feeding a tree 50 to a cutting device, for example a chainsaw, for cutting the tree trunk to a predetermined length. During feeding the tree 50 is essentially horizontal and the hub 22 of the operating device 55 rotating the feed roller 1 is then essentially vertical. The feed roller 1 is attached from its first end to an attachment hub 22 of the operating device 221. The second end of the feed roller 1, which is opposite to the attachment hub 22, is left open and exposed to open space 100 shown in FIG. 8. The attachment hub 22 preferably includes a second attachment flange 222 for attaching the attachment hub 22 to the attachment flange 2 of the feed roller 1 using bolts 223.

[0080] As the toothed discs 3 of the feed roller 1 grip the tree 50 small pieces of bark is detached from the surface of the tree 50. In the feed roller assembly according to the invention the pieces of bark can move through the feed roller 1 as shown with arrows 225 in FIG. 7 via lightening openings 20 of the toothed discs 3 shown in FIG. 5. The lightening openings 20 also act as passages for the pieces of bark to fall through the feed roller 1 keeping clean. In addition, pieces of bark can fall off the feed roller over the sides of the feed roller in radial direction of the drive shaft of the operating device 55 since the feed roller 1 is surrounded by open spaces 100 shown in FIG. 8. The open spaces 100 surrounding the feed roller 1 also enable the use of cleaning comb 24 since the cleaning comb 24 can be attached on the outer periphery of the feed roller 1 as shown in FIG. 9. The difference between the second embodiment of the feed roller 1 shown in FIG. 9 and the first embodiment shown in FIGS. 1-8 is that in the second embodiment the spacer pieces are not equipped with shoulders as in the first embodiment.

[0081] The properties of one feeder roller of an assembly according to the invention are itemized as follows: [0082] Manufacture of the toothed discs and/or the attachment flanges takes place by laser cutting, the material being Hardox 600, sheet thickness 10 mm. Hardox 600 is the very strong steel of the Swedish company SSAB, which has a yield strength of 1650-2000 N/mm.sup.2 (conventional structural steel 335-520 N/mm.sup.2), 8.8 bolt is 880 N/mm.sup.2. Laser cutting does not substantially soften the structure in the same way as welding does and is suitable even with the hardness of the material Hardox 600. [0083] Spacer pieces are manufactured automatically by machining, the material being steel or a special-strength aluminum. [0084] The spacer pieces receive the structural forces, the bolts holding the feed roller together. [0085] Reliable construction, over-dimensioned bolted-joints, 8-10 bolts, M14/strength 12.9. [0086] By means of the construction, excellent grip is achieved, thanks to the numerous sharp spikes of the toothing. [0087] Acute spike angle: the feed roller will remain in the tree with a lower pressure. [0088] The feed rollers also have good reversing properties, due to the symmetrical structure of the toothing. [0089] Limitation of bite with the aid of the shoulders of the tooth of the toothing prevents the spikes from sinking too deeply into the tree. [0090] If necessary, a damaged part of a feed roller can easily be changed to a different part of the feed roller, or replaced with a new part. [0091] New arrangements in the structure can be implemented easily, thanks to the maintenance-friendly bolted construction. [0092] The cleaning comb of the feed roller keep the feed roller always clean, so that its grip is preserved. [0093] Mass-handling properties have also be shown to be good. [0094] The final result is a feed roller with good operating properties.

[0095] It must be understood that the above description and the related figures are only intended to illustrate the present invention. The details of the construction of the feed roller can vary within the scope of the inventive idea stated in the accompanying claims.