JP2000015607A - Veneer lathe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the indisposed cutting ability and lowering of yield from occurring by the cutting into pieces of a log due to cracks by a method wherein a cutting knife abuts against the outer periphery of the log at the upper side in the direction of rotation of the log and a rotatingly driven rotator presses the outer periphery of the log at the upper side in the direction of rotation of the log. SOLUTION: At the starting of cutting, under the condition that the piston rod of an air cylinder is retreated and both the edge faces of a log 12 are supported with spindles, the log 1 is rotated so that the peripheral speed of the log 1 is run slower than that of a roller bar 9 by a predetermined value, resulting in controlling the amount of the advancement per one rotation of the log 1 to a plane stock 4. A cutting knife 2 and the roller bar 9 abut against the peripheral surface of the log 1, resulting in cutting the log 1 with the cutting knife 2 by means of the force F1 of the roller bar 9 and the forces of the spindles so as to obtain a veneer T intermittently. When the unevenness of the peripheral surface of the log 1 is annulled through the continuation of cutting of the log 1 and consequently a continuous band-like veneer T is obtained, the piston rod of the air cylinder is advanced manually by an operator. Thus, even when the log 1 has cracks, the cutting of the log can be performed without widening the cracks with pressers 9 and 24, resulting in allowing to raise the yield of a veneer T to be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veneer lace for obtaining a veneer veneer by cutting a rotating log with a cutting tool.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10 which is an explanatory side view, for example, a veneer race is provided on a pair of spindles (not shown) S provided to be able to advance and retreat in the axial direction of a log 1 and a plane table 4. A cutter 2 for cutting a log 1 rotatably supported by a spindle S and a roller bar 3 provided on a pressure bar base 10 integrated with a plane table 4 and driven to rotate in a direction indicated by an arrow by a motor (not shown). It is configured.

[0003]

That is, the roller bar 3 is formed to have a relatively small diameter of about 15 to 50 mm in diameter, and a small amount (usually a single unit) from the peripheral surface of the raw wood in order to prevent splitting by cutting with the blade 2. (10% of the thickness of the plate). Since the press-fitted state is applied, a portion of the peripheral surface of the log 1 that passes through the location of the roller bar 3 receives a resistance force in the direction opposite to the rotation direction. Usually, since the frictional force or shearing force transmitted from the roller bar 3 to the log 1 is larger than this resistance, the log 1 is cut without any trouble. However, if there is a crack R in the log 1 as shown by the solid line in FIG. 10, when cutting the locations of the upper end Ra and the lower end Rb of the crack R in the rotation direction of the log 1, Especially at the end Rb
Since the raw wood 1 on the side slightly moves in the direction opposite to the rotation direction of the raw wood 1, the amount of cutting at the end Rb is smaller than at other parts. When cutting with such a crack R is repeatedly performed, the end portion Rb partially projects outward in the radial direction with respect to the other portion of the raw wood 1 peripheral surface as shown in FIG. It grows gradually. As shown in FIG. 1, when the end portion Rb cannot be sent to the blade 2 side even by the frictional force or the shearing force of the roller bar 3, the rotation of the log 1 is stopped, and cutting cannot be performed, or cracks R are generated. Further, at the end of the spread, the log 1 is divided into a plurality of pieces, which makes it impossible to cut, thereby greatly reducing the yield. Further, as shown by the two-dot chain line in FIG. 10, when the crack R1 of the log 1 is inclined with respect to the radial direction, the crack R1 spreads due to centrifugal force generated by the rotation of the log 1 and the Rc of the log 1 is reduced. The portion moved radially outward as indicated by the arrow, and the R2 portion could not be sent to the blade 2 side due to the frictional force or the shearing force of the roller bar 3, and the yield was also greatly reduced.

[0004]

According to the present invention, there is provided a knife for cutting a rotating log, and
A veneer lace comprising a rotating body that is in contact with the outer circumference of the log on the upstream side in the log rotation direction and is rotationally driven by the drive source, and a pressing body that is pressed against the outer circumference of the log on the upstream side in the log rotation direction of the rotating body. I do. Further, these blades, rotating bodies, and pressing bodies may be provided on a plane table. In these configurations, the pressing body may be a rotating roll having a piercing body around it, or a guide member having a contact surface continuous in the log rotation direction. Further, the rotating body may be a roller bar provided at a position in contact with both the outer periphery of the log and the veneer veneer.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following embodiments of the present invention will be described. The embodiment of the present invention is shown in FIG. 1 which is a side view and FIG. 2 which is a partial enlarged explanatory view in a direction of an arrow in FIG. -B
3 is an explanatory view in the direction of the arrow in FIG. 3 and FIG. 4 is an explanatory view in the direction of the arrow in the dashed line CC of FIG. That is, the spindle (not shown) in FIG.
A plane table 4 that moves at a predetermined moving speed with respect to the log 1 that is rotatably supported by the above is fixed to a plane table 4 with a cutting tool 2 for cutting the log 1. Further, a pressure table 10 integrally formed with the plane table 4 fixes the upper end portions of the roller bar holding members 5 and 6 arranged in a large number as described later. The shape of the side surfaces of the holding members 5 and 6 is the same as shown in FIG. 1, but the shape shown in FIG.
Is an L-shape whose lower end 5a extends to the left, and the holding member 6 is an L-shape whose lower end 6a extends to the right.
And 6a are in a state where the tips in the left-right direction are close to each other. As a result, the space above both lower ends 5a and 6a is a space. The lower ends 5a and 6a of the holding members 5 and 6 have
The notches 7 are provided so as to be at the same position in the vertical direction in FIG. 2, and an arc-shaped sliding bearing 8 is fixed to each notch 7.

A single roller bar 9 having a diameter matching the arcuate inner surface of the slide bearing 8 is inserted into the slide bearing 8 and held rotatably. Although not shown, the peripheral surface of the roller bar 9 is formed with fine irregularities by knurling so that a greater force is transmitted from the roller bar 9 to the peripheral surface of the log 1. Roller bar 9
, The rotation of a motor (not shown) is transmitted by a chain (not shown) and is always rotated in the direction of the arrow. In the space above the lower end 5a, as shown in FIGS.
A shaft 15 fixed to the holding table 5 is rotatably provided via a bearing 16 with an arm 17 having a slightly thinner cutout at the lower end opposite to the holding table 5. A bearing (not shown) is also provided on the shaft 18 fixed to the holding base 6 above the lower end 6a.
, An arm 19 having a cut-out lower end opposite to the holding table 6 is rotatably provided. A bearing 20 is provided at the lower end 17a of the arm 17, and a lower end 19a of the arm 19 is provided.
A bearing (not shown) is also provided on the shaft 22 to penetrate both bearings.
Place. Rolls 24 each having a piercing body 24a around them are fixed at positions where the arms 17 and 19 are sandwiched by the shaft 22. A sprocket 26 is fixed to a portion between the arm 17 and the arm 19 on the shaft 22, and the sprocket 26
Over the chain 28. The chain 28 transmits the rotation of a motor (not shown) via a one-way clutch to run in the direction of the arrow, and when the piercing body 24a is not pierced into the peripheral surface of the log 1, the piercing body 24a of the roll 24 is The roll 24 is rotated so that the peripheral speed is 1 to 3% greater than the peripheral speed of the log 1 rotated by the spindle.

Further, the shapes of the side surfaces of the arms 17 and 19 are as follows.
As shown in FIG. 3, the lower ends 17a and 19a are L-shaped extending to the opposite side of the log 1 and each of the lower ends 17a and 19a.
As shown in FIG. 4, the side surface of “a” is fixed to a mount 30 arranged in parallel with the roller bar 9. As shown in FIG. 4, the tip of a piston rod 34 of an air cylinder 32 is rotatably connected to the mounting base 30 by a pin mechanism using a pin 36. In these configurations, the air cylinder 32 is operated by the supply and exhaust of compressed air to move the piston rod 34 back and forth, so that the roll 24 provided on each of the arms 17 and 19 rotates around the shafts 15 and 18 while rotating the raw wood. Move back and forth with respect to 1. The pressure of the compressed air supplied to the air cylinder 32 is set such that one roll 24 is pressed against the peripheral surface of the log 1 with a force of about 6 kg, and the operation of the air cylinder 32 is controlled by the driver. It is done by manual operation signal.

The embodiment of the present invention is configured as described above, and the log 1 is cut as follows. At the start of cutting,
As shown in FIG. 3, the piston rod 34 of the air cylinder 32 is retracted and made to stand by, and the peripheral speed of the raw wood 1 is reduced by the roller bar 9 while supporting both end faces of the raw wood 1 by a spindle, similarly to a known veneer race. The plane table 4 is rotated in a state where it is smaller by 1 to 3% than the peripheral speed, and the plane table 4 is controlled and moved so that the amount of movement toward the log 1 per rotation of the log 1 is constant. Soon, as shown by a two-dot chain line in FIG. 3, the blade 2 and the roller bar 9 come into contact with the peripheral surface of the log 1, and the log 1 is moved by the blade 2 by the force F1 from the roller bar 9 and the force transmitted from the spindle. The veneer is cut and the veneer T is obtained intermittently. When the log 1 is continuously cut as described above, and the peripheral surface of the log 1 is no longer uneven, and a continuous strip-shaped veneer T is obtained, the air cylinder 32 is operated by an operation signal manually by the driver, and the piston rod is operated. 34 is advanced.

Therefore, each arm 1 fixed to the mounting base 30
7 and 19 are moved to the log 1 side, and the roll 24 having the piercing body 24a provided in each of the arms 17 and 19 and rotated in the direction of the arrow hits the peripheral surface of the log 1 as shown in FIG. Touched. Since the roll 24 is rotated at the peripheral speed via the one-way clutch as described above, each roll 24 is rotated in a state where the peripheral speed of the piercing body 24a is equal to the peripheral speed of the log 1 to be rotated. Therefore, the force F2 for rotating the log 1 is transmitted, and the log 1 is rotated by the force F1 from the roller bar 9 and the force transmitted from the spindle. In the cutting in a state where the roll 24 is in contact with the peripheral surface of the log 1, as shown in FIG. 5, when the log 1 has a crack P indicated by a two-dot chain line, the crack P passes through the location of the roll 24. After that, the raw wood 1 on the end Pb side tends to move in the direction opposite to the rotation direction of the raw wood 1 by the force received from the blade 2, the roller bar 9, etc., but the force is generated by the piercing body 24 a of the roll 24 as described above. The movement is prevented because of receiving F2, so that the cutting tool 2 can cut well as well as the portion other than the crack P.

[0010] Further, even if there is a crack Q inclined in the radial direction in the log 1 shown in FIG. 5 and the crack Q spreads due to centrifugal force, when passing through the location of the roll 24, the crack Q spread by being pushed by the roll 24. Is closed, and the cutting is performed similarly. Further, by providing the roll 24 as a pressing body on the plane table, the plane table can be used as a member for following the log which becomes smaller in diameter as it is cut, thereby simplifying the configuration.

Next, a modification of the embodiment of the present invention will be described.
1. In the embodiment of the present invention, the roll 24 is brought into contact with the raw wood 1 after the continuous strip-shaped veneer is obtained from the raw wood 1, but the following may be adopted. That is, the thickness is 1
When cutting a veneer of about mm, the cutting force such as the cutting force of the blade is relatively small, and even if there is a crack in the log, the crack is not spread and the log is less likely to be cut. In the case where the obtained veneer is used as a front plate such as a plywood without cutting the veneer 1 and a relatively thick veneer is cut, the roll 24 is brought into contact with the veneer and used as an intermediate plate such as a plywood. good. 2. Instead of the roll 24, the pressing body pressed against the outer periphery of the log may be configured as follows. 6 corresponding to FIG. 2 and a dashed line DD of FIG.
The guide member 44 which will be described later with reference to FIG.
7, a guide member 44 is rotatably provided on a shaft 40 fixed to the holding tables 5, 6 via a bearing 42. As shown in FIG. Guide member 4
4 has a contact surface 44a that is continuous in the rotation direction of the log 1, and the side surface is L-shaped as shown in FIG.
Similarly to the embodiment of the present invention, the lower end of each guide member 44 is fixed to the mounting base 30, and the mounting base 30 uses the pin 36 for the tip of the piston rod 34 of the air cylinder 32 (not shown). It is rotatably connected by the pin mechanism. In these configurations, similarly, the operation of the air cylinder 32 causes the guide member 44 to move back and forth with respect to the log 1. The pressure of the compressed air supplied to the air cylinder 32 is set so that each guide member 44 is pressed against the peripheral surface of the log 1 with a force of about 20 kg.

In the cutting with the guide member 44 in contact with the peripheral surface of the log 1, as shown in FIG. 7, when the log 1 has a crack P indicated by a two-dot chain line, the crack P is a guide member. 44
, The log 1 on the end Pb side is going to move in the direction opposite to the rotation direction of the log 1 by the force received from the blade 2, the roller bar 9, etc., but the rotation of the log 1 by the guide member 44. Since the movement toward the center is received, the movement is prevented, so that the cutting tool 2 can perform a good cutting similarly to the portion other than the crack P. In addition, the log 1 shown in FIG. 7 has a crack Q inclined with respect to the radial direction.
Spreads, the crack Q pushed and spread by the guide member 44 when passing through the guide member 44 closes,
Similarly good cutting is achieved.

3. In the embodiment of the present invention, the roller bar 9 is used as the rotating body. However, like the roll 24, a disk-shaped roll 48 having a piercing body 48a on the peripheral surface may be used. 8 corresponding to FIG. 2 and the dashed line E-
It is configured as shown in FIG. 9, which is an explanatory view of a state in which a roll 24 described below is in contact with the raw wood 1 in a view seen in the direction of the arrow in E. A nose bar 50 is fixed to a pressure bar base 52 of a plane base (not shown).
As shown in FIG. 9, the lower end 50a of the log 1 is pressed against the outer periphery of the log 1 immediately before the cutter 2, and the back side (the right side in FIG. 9) of the lower end 50a is rotated as described later. An arc-shaped notch is formed for the space of the shaft 56. A large number of the nose bars 50 are arranged in the left-right direction in FIG. The cutout portion 54 above each nose bar 50 is configured as follows with respect to the nose bar 50 on the right side in FIG. The shaft 15 is fixed to the nose bar 50, and the arm 17 provided with a bearing 16 below, and the shaft 18 is also fixed to the nose bar 50 on the left side in FIG.
9 is rotatably provided. Furthermore, bearings are provided at the lower ends of the arms 17 and 19, and a shaft 22 that penetrates both bearings is arranged. At a position where the arms 17 and 19 are sandwiched by the shaft 22, rolls 24 each having a piercing body 24a around each are provided. Fix it. In order to rotate the roll 24, a sprocket 26 and a chain 28 are also provided. The chain 28 transmits the rotation of a motor (not shown) via a one-way clutch and runs in the direction of the arrow, and the piercing body 24a When the peripheral surface of the roll 1 is not pierced, the roll 24 is rotated such that the peripheral speed of the piercing body 24a of the roll 24 is 2-3% higher than the peripheral speed of the log 1 to be rotated. Further, the arms 17 and 19 are fixed to the mounting base 30, and the mounting base 30 is turned by a pin mechanism using a pin 36, as in the configuration shown in FIG. Connect movably.

In addition to the same configuration as the above-described embodiment of the invention, the arc-shaped notch of the nose bar 50 is provided on the nose bar base 52 via a bearing (not shown). In the same manner as described above, the rotation of a motor (not shown) is transmitted via a one-way clutch, so that a rotation shaft 56 driven to rotate in the direction of the arrow is arranged. The roll 48 is fixed to the rotating shaft 56 at a position between the adjacent nose bars 50, and the peripheral speed of the tip of the piercing body 48 a of the roll 48 indicates that the piercing body 48 a pierces the peripheral surface of the log 1. When it is not performed, it is set to be about 1 to 3% higher than the peripheral speed of the log 1 rotated by the spindle. Even with the above configuration, even if the raw wood 1 has a crack indicated by a two-dot chain line in FIG. 9, the cutting of the raw wood 1 is similarly performed without any problem.

4. The roll 24 having the piercing body 24a shown so far is a roll having a flat peripheral surface, a roll having fine irregularities formed by knurling on the peripheral surface, and a roll having an elastic body provided on the peripheral surface. It is good. 5. In the modification shown in 3 above, instead of the roll 48 having the piercing body 48a, a roll having a flat peripheral surface, a roll having fine irregularities formed by knurling on the peripheral surface, and an elastic body on the peripheral surface A provided roll may be used. 6, as a rotating body,
Roll bar 9, roll 48 having piercing body 48 a, etc.
Although provided at a position in contact with both the outer periphery of the raw wood and the surface of the cut veneer, it may be provided at a position in contact with only the outer periphery of the raw wood. 7. The roll 24 as the pressing body, the guide member 44, and the like are provided on the plane table via an air cylinder, and more accurately follow the log that is reduced in diameter as it is cut. May be controlled mechanically or electrically to follow the same.

[0016]

As described above, according to the present invention, even if there is a crack in the log, the log around the crack is prevented from being displaced by the pressing body due to resistance during cutting and the like. The cutting is performed without spreading the crack by the force of the rotating body, and even if the crack spreads in the radial direction due to the centrifugal force, the pressing body pushes the crack toward the rotation center side of the log before reaching the location of the rotating body. As a result, the crack is closed, and at the same place, the cutting is performed without expanding the crack by the force of the rotating body at the position of the blade, thereby increasing the yield of veneer obtained from the raw wood.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of an embodiment of the present invention.

FIG. 2 is a partially enlarged explanatory view of a cross-sectional view taken along a dashed-dotted line AA in FIG.

FIG. 3 is an explanatory diagram of a cross-sectional view taken along a one-dot chain line BB in FIG.

FIG. 4 is an explanatory view of a cross-sectional view taken along a dashed-dotted line CC in FIG.

FIG. 5 is an operation explanatory view of the embodiment of the present invention.

FIG. 6 is an explanatory diagram of a modification of the embodiment.

FIG. 7 is a view of the dashed line DD in FIG.
FIG. 4 is an explanatory diagram of a state in which a guide member 44 is in contact with the log 1.

FIG. 8 is an explanatory diagram of a modification of the embodiment.

FIG. 9 is a view of the dashed line EE in FIG.
FIG. 3 is an explanatory diagram of a state where a roll 24 is in contact with a log 1.

FIG. 10 is an explanatory side view of a conventional device.

[Explanation of symbols]

 1. Log 2. Cutting blade 3. Roller bar 4. Plane table 5. Roller bar holding member 6. Roller bar holding member 9. Roller bar 10. Pressure table 17. Arm 19. Arm 24 Roll 24a Piercing body 32 Air cylinder 44 Guide member 48 Roll 48a Piercing body 56 Rotating shaft T Single plate

Claims (5)

[Claims] 1. A cutting tool for cutting a rotating log, a rotating body which is in contact with the outer periphery of the log at a position upstream of the rotating direction of the log, and which is rotated by a driving source, and a side of the rotating body which is upstream of the rotating direction of the log. A veneer lace with a pressing body pressed against the outer circumference of the log. 2. A cutting tool for cutting a rotating log on a plane table, a rotating body which is in contact with the outer circumference of the log on the upper side in the rotating direction of the raw wood, and which is driven to rotate by a driving source; A veneer lace with a pressing body that is pressed toward the outer circumference of the log on the upper side in the direction. 3. The veneer lace according to claim 1, wherein the pressing body is a rotating roll having a piercing body around the pressing body. 4. The veneer lace according to claim 1, wherein the pressing body is a guide member having a contact surface that is continuous in the log rotation direction. 5. The veneer race according to claim 1, wherein the rotating body is a roller bar provided at a position in contact with both the outer periphery of the log and the veneer veneer.