JP3399304B2 - Woodworking machine feed roller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed roller of a woodworking machine used to feed wood to be processed on a surface plate, and particularly to a feed roller of a woodworking machine having high durability.

[0002]

2. Description of the Related Art In a woodworking machine for processing wood, wood is processed as a processing material by a feed roller. FIG. 5 is a schematic perspective view showing a conventional woodworking machine. A ruler 13 is arranged on the surface plate 12 for guiding the wood 14 to be processed in a predetermined direction (hereinafter referred to as a feeding direction). This allows
The wood 14 moves in the feeding direction while following the side surface of the ruler 13. A plurality of feed rollers 11 are arranged above the path along which the wooden piece 14 moves so that their rotation axes are parallel to each other and are perpendicular to the feeding direction of the wooden piece 14. A plurality of teeth 15 are formed on the circumferential surface of each feed roller 11 so as to extend in a twisting direction with respect to the rotation axis of the feed roller 11. A housing 16 that covers the feed roller 11 is provided above the feed roller 11. In addition, the teeth 15 are formed in the rotation direction of the feed roller 11.
The end on the side of the ruler 13 is behind the end on the opposite side, so that a force component directed toward the ruler 13 always acts on the wood 14 delivered by the feed roller 11.

In the woodworking machine constructed as described above,
The feed roller 11 rotates in the direction indicated by the arrow 17. Then, when the wood 14 is fed below the feed roller 11, the teeth 15 of the feed roller 11 bite into the wood 14, and the rotation of the feed roller 11 causes the wood 14 to follow the side surface of the ruler 13 and feed it on the surface plate 12. It is sent in the direction and moves.

Next, the feed roller 11 used in this woodworking machine will be described. FIG. 6 is a perspective view showing a conventional feed roller. In the conventional feed roller 11, as described above, the plurality of teeth 15 are formed on the outer peripheral surface so as to be engraved at equal intervals integrally with the feed roller 11 itself. The teeth 15 are inclined at a constant angle with respect to the feeding direction of the wood 14. Thus, the tooth 15
Is inclined with respect to the feed direction, a force component in a direction perpendicular to the feed direction also acts on the wood 14, and the wood 14 moves while being pressed against the side surface of the ruler 13. Therefore, it is possible to move the wooden piece 14 in the feeding direction while preventing the occurrence of positional deviation. The angle of inclination of the teeth is appropriately determined. The feed roller 11 is made of carbon steel, and the tip of the feed roller including its teeth 15 is hardened by quenching.

[0005]

However, in the conventional feed roller, there is a problem that the teeth are worn and worn out during use. For this reason, the power to feed wood is reduced in about one year, and it is necessary to replace it. At the time of this replacement, it is necessary to replace the entire feed roller, resulting in a high running cost.

The present invention has been made in view of the above problems, and it is possible to re-polish a worn tooth and replace only the worn tooth, and further reduce the wear of the tooth. It is an object of the present invention to provide a feed roller for a woodworking machine that can be manufactured and has low manufacturing cost and running cost.

[0007]

A feed roller of a woodworking machine according to the present invention is a feed roller of a woodworking machine that feeds out wood by rotation, and a rotatable roller body having a plurality of grooves formed on an outer peripheral surface thereof. Part of the groove is detachably fitted
Is located in the groove and the rest is exposed outside the roller body.
Intersecting the pair of first surfaces and the pair of first surfaces
A flat surface having a second surface that is inclined and abutted against the surface of the wood
A plate-like, has a plurality of teeth made of hard metal, a,
It is characterized in that the groove extends in a direction parallel to a rotation axis of the roller body or in a twisting direction.

In the present invention, since the roller body and the teeth are composed of separate parts, if there is a tooth that is worn and has a reduced wood feeding force, it can be restored by re-grinding, and Only the worn tooth can be replaced. For this reason, it is not necessary to replace the roller main body having no defect at the same time. Therefore, the feed roller according to the present invention has a low running cost.

The hardness of the teeth is preferably Rockwell hardness (HRA) of 88.5 or more. By setting the hardness of the tooth to 88.5 or more in Rockwell hardness (HRA), the durability of the tooth is improved and the frequency of replacement can be reduced. In this case, not the entire roller,
Since only the teeth need to be hardened, the feed roller according to the invention is low in manufacturing cost.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A feed roller for a woodworking machine according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a feed roller of a woodworking machine according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same.
FIG. 3 is a side view of the same. In this embodiment, the roller body 2 is made of carbon steel, and the groove 4 is formed on the outer peripheral surface thereof. Then, after the tooth 3 made of tungsten carbide, which is a cemented carbide having a Rockwell hardness (HRA) of 88.5, is driven into the groove 4 in the roller body 2,
It is fixedly arranged by brazing. Therefore, the tooth 3 can be removed from the groove 4 by melting the wax. As shown in FIG. 2, the tooth 3 has a flat plate shape with a rectangular cross section, and its front and back surfaces are arranged so as to face the central axis of the feed roller 1.

In this embodiment, the teeth 3 are the roller main body 2
Since it consists of removable parts, only the tooth 3 can be replaced when the tooth 3 wears, and the roller body and other teeth 3 which have no defects continue to be used. You can Therefore, the running cost is low.

As shown in FIG. 3, the teeth 3 have a helix angle of 5 to 15 ° with respect to the direction of the rotation axis of the roller body 2. The twist direction is determined according to the feed direction and the position of the ruler in the woodworking machine in which the feed roller 1 is used.

FIG. 4 is a sectional view showing details of the roller body and the teeth. As shown in FIG. 4, the apex of the side surface of the tooth 6 on the rotation direction side may form an acute angle. Since the tops of the side surfaces of the teeth 6 on the rotation direction side form an acute angle, it becomes possible to more easily feed the wood in the feed direction. Further, the teeth 6 may have a rake angle inclined by −5 to 5 ° in the rotational direction with respect to the radial direction of the roller body 5. In this case, the rake angle is positive when the extension line extending from the side surface of the tooth 6 to the outside of the roller body 5 extends to the rotation direction side of the tooth 6 in the radial direction of the roller body 5.

Next, the reason for limiting the numerical values of the feed roller will be described.

Rake Angle Angle α: -5 to 5 ° The rake angle is provided so that the teeth brazed to the groove can efficiently feed wood. The rake angle α is -5 to 5
Departure from ° tends to reduce the efficiency of feeding wood. Therefore, it is desirable that the rake angle α is −5 to 5 °.

Angle of helix angle β: 5 to 15 ° The helix angle is provided so that the teeth brazed to the groove apply a force to the wood in a direction orthogonal to the feed direction to move the wood while pushing it against the side of the ruler. Has been. Angle of twist β
Is less than 5 °, the force of pressing the wood against the side surface of the ruler tends to be weak. On the other hand, if the angle β exceeds 15 °, it becomes difficult to manufacture the roller, and the manufacturing cost increases. Therefore, the angle β of the twist angle is preferably 5 to 15 °.

Diameter of roller body: 130 mm or more If the diameter of the roller body is less than 130 mm, it becomes difficult to manufacture the roller, and the manufacturing cost increases. Therefore, the diameter of the roller body is preferably 130 mm or more.

Number of teeth: 40 to 60 If the number of teeth is less than 40, the load applied to each tooth will be large and breakage may occur. On the other hand, the number of teeth is 6
If the number exceeds 0, the timber may be turned up, weakening the feeding power. Therefore, it is desirable that the number of teeth is 40 to 60.

Tooth hardness: Rockwell hardness (HRA)
88.5 or more When the hardness of the tooth is less than 88.5 in Rockwell hardness (HRA), the tooth is easily worn. Therefore, the hardness of the tooth is preferably Rockwell hardness (HRA) of 88.5 or more. If the hardness of the teeth is too high, the teeth may crack. In this embodiment, since the teeth are made of different parts from the roller main body, when increasing the hardness of the teeth, it is sufficient to harden only the teeth, which is extremely superior to the case where the teeth are integrated with the roller main body. The hardness of the teeth can be easily increased.

Further, the tooth pitch is appropriately selected according to the material of the wood as the work material, the feeding speed and the force.

As the carbon steel used for the main body,
For example, S45C is mentioned.

[0022]

As described in detail above, according to the present invention,
The feed roller of the woodworking machine is composed of the roller body and the teeth, and the roller body and the teeth are separate parts. Only teeth can be replaced. Therefore, it is not necessary to replace defective parts at the same time, and the running cost is low. Further, only the teeth can be hardened, and it is not necessary to harden the roller main body, so that the manufacturing cost can be reduced. Moreover, since only the teeth need to be hardened, the hardness of the teeth can be made appropriate without being restricted by the roller body, and the wear of the teeth can be further reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a feed roller of a woodworking machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a cross-sectional view showing details of a roller body and teeth.

FIG. 5 is a schematic perspective view showing a conventional woodworking machine.

FIG. 6 is a perspective view showing a conventional feed roller.

[Explanation of symbols]

1, 11; feed roller, 2, 5; roller body, 3,
6, 15; Tooth, 4; Groove, 12; Surface plate, 13; Ruler, 14; Wood, 16; Housing, 17; Arrow

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65G 39/07 B27B 25/02 B27L 5/06

Claims (2)

(57) [Claims] 1. A feed roller of a woodworking machine for feeding wood by rotation, wherein a rotatable roller body having a plurality of grooves formed on an outer peripheral surface thereof is detachably fitted into the groove, and a part of the groove is provided. Located within
The remaining part is exposed to the outside of the roller body.
A surface and a surface of the wood that intersects the pair of first surfaces
Carbide that has a flat plate shape with a second surface that inclines and abuts
A plurality of teeth made of an alloy , and the groove extends in a direction parallel to a rotation axis of the roller body or in a twisting direction. 2. The hardness of the tooth is Rockwell hardness (HR).
The feed roller of a woodworking machine according to claim 1, wherein A) is 88.5 or more.