JP2001001310A - Veneer lathe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a veneer lathe which enhances productivity by cutting a log unfailingly until it becomes smaller in diameter and can be remodeled to be a small-size device and is capable of improving the use application of a power source by distributing power generated by a rotary drive force generating source appropriately to a spindle drive and an outer periphery drive. SOLUTION: This veneer lathe comprises a pair of a right and a left spindle device, each holding a cross section face of each of the both ends of a log 1, which are driven to be rotated, a first drive roll device arranged, across the entire length of the log 1, on the tip upper part of a cutter, a plurality of second drive roll devices positioned at an opposite side to the cutter with the spindle devices set in between, a spindle drive means for driving the spindle devices to be rotated and roll drive means for driving the first and the second drive roll device to be rotated. In addition, each of the spindle devices has each of spindles which are inserted and pivotally supported in the hollow part and are driven to be rotated in a freely proceeding/receding manner and the spindle drive means has an electric motor 14 and a first hydraulic motor 41 which assists the former. The roll drive means has at least second hydraulic motors 30b, 30c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veneer lathe for cutting a veneer, which is used as a plywood material, by holding and rotating a log, and more particularly to a source capable of stably cutting down to a smaller diameter and a rotational driving force source. The veneer race is capable of reducing the size of the apparatus and improving the utilization of a power source by appropriately allocating the generated power to spindle drive and outer peripheral drive.

[0002]

2. Description of the Related Art Conventionally, when cutting a veneer veneer with a veneer lath, a rotary driving method using a double spindle that holds the end face of the log of the log is used. An outer peripheral rotary drive system in which a drive roll is disposed, a plurality of drive rolls are disposed at a position opposite to the blade with the spindle interposed therebetween, and the raw wood is clamped from the outer periphery and driven to rotate. And a method in which the above driving is used together.

[0003] When a system using this drive is used, local kneading, misalignment and runout can be prevented, and high-quality cutting can be stably performed with a uniform thickness. On the other hand, by making it subordinate, it becomes possible to provide a smooth surface without providing a piercing body for increasing the drive transmission force on the surface of the drive roll, and as a result, sticking marks of the piercing body remain on the cut single plate. There is a feature that does not cause a defect.

In this method, when the log is cut to a small diameter, the large-diameter spindle holding the log is retracted to hold only the small-diameter spindle, and the area of the chuck holding the log is reduced. Therefore, in this case, it is desirable to increase the ratio of the rotational driving force of the driving roll from the outer periphery to the log, since the holding force may be uncertain unless the force transmitting the rotation is reduced. .

[0005] On the other hand, even if the rotational driving force of the drive roll from the outer periphery to the log is excessively large, there is a possibility that the drive roll without the piercing body may not be able to sufficiently transmit the driving force.

The diameter of the spindle is usually about 180 to 220 mm for a large spindle, and about 90 to 120 mm for a small spindle.

[0007]

Therefore, in this case, there is naturally a limit in exerting the rotational driving force of the drive roll from the outer periphery to the log, but at present, even when only the small spindle is held, The transmission of the driving force of the driving roll does not cause any problem. That is, the driving row
In order to cause the possibility of uncertainty in the rotational drive of the small spindle when holding the small spindle in a state where the rotational drive force by the drive roll is applied to such an extent that the transmission of the drive force of the spindle does not become a problem, the diameter of the small spindle is still small. Is thick enough.

On the other hand, the small spindle diameter is φ9 as described above.
The diameter is about 0 to 120 mm, so that the core diameter after cutting must be about 100 to 130 mm, and there remains a problem that small diameter logs cannot be cut sufficiently. . Next, another problem will be described below. When cutting is started from the raw wood as it is, the outer peripheral drive cannot be used together due to the unevenness of the raw wood surface shape. For this reason, the spindle drive motor drives the spindle device together with the large-diameter log, so that the spindle drive motor must be increased in size and consumes a large amount of power.

[0009] However, when the log is cut and thinned, the motor cannot be fully driven when the motor is enlarged. This is because, in addition to the decrease in inertia due to the small diameter of the log, the outer peripheral drive is energized as described above, and the ratio also increases.

On the other hand, regarding the driving force of the outer peripheral driving motor, the driving force is required as the diameter becomes smaller from the start of the log cutting. Therefore, the outer peripheral drive motor needs to have the required driving force specifications when the diameter is small.

Considering the relationship between the spindle drive motor and the outer peripheral drive motor, the times at which the maximum power is exhibited in the cutting operation are different from each other, and both output the maximum power. Devices with sufficient specifications are required for the device. This causes the device to become larger,
On the other hand, since the maximum power is not always required during the cutting operation, the degree of utilization of each power source is reduced.

The present invention has been made in view of these circumstances, and improves the productivity by reliably cutting until the log becomes thinner than before, thereby improving the productivity. It is an object of the present invention to provide a veneer race capable of appropriately reducing the generated power between spindle drive and outer peripheral drive so as to reduce the size of the apparatus and improve the use of a power source.

[0013]

Means for Solving the Problems To solve the above problems,
The present invention relates to a pair of left and right spindle devices each capable of holding and driving both ends of a log and driving and rotating, and a first drive roll device disposed over the length of the log at the upper end of a blade. A plurality of second drive roll devices disposed at positions opposite to the blade with respect to the spindle device, and spindle driving means for rotating the spindle device;
Roll drive means for driving the first and second drive roll devices to rotate, and the spindle device includes a plurality of spindles each of which is inserted / supported in a hollow portion and is capable of driving forward / backward while being able to move forward and backward. And the spindle driving means comprises:
An electric motor, and a first hydraulic motor for energizing the electric motor, wherein the roll driving unit includes at least a second hydraulic motor.
Characterized by having a hydraulic motor of

[0014] Thus, the cutting operation is reliably performed by using the smallest spindle among the plurality of spindles until the log becomes smaller than before, thereby improving the productivity.
The electric motor can be downsized by the energization of the first hydraulic motor.

Further, the apparatus further includes control means for allocating a hydraulic pressure to the first hydraulic motor and a hydraulic pressure to the second hydraulic motor, and the control means is configured to reduce the diameter of the log as the cutting diameter decreases. It is characterized in that the allocation of hydraulic pressure to the second hydraulic motor is largely controlled.

Thus, in addition to the above, it is possible to further reduce the size of the apparatus and improve the utilization of the power source by appropriately allocating the generation power of the rotational driving force generation source to the spindle drive and the outer peripheral drive.

Further, in the spindle device, the number of the plurality of spindles is three.

[0018] Thereby, the smallest spindle smaller than the conventional small spindle is inserted into the hollow portion provided at the axis of the small spindle so as to be able to drive and revolve freely, so that it is cut to a smaller diameter. In this case, even in the case of a smaller diameter, the spindle rotational drive can be performed by applying a force from the outer periphery of the drive roll to such an extent that the transmission of the drive force of the drive roll is not a problem due to the conventional margin. There is no possibility of uncertainty.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a veneer race according to the present invention. In the figure, reference numeral 1 denotes a raw wood as a raw material. The raw wood 1 is held at both ends by a pair of left and right spindle devices composed of a large spindle 2, a small spindle 3, and a minimum spindle 4. It rotates in the direction of the mark A. Here, this spindle device is configured as described below so as to be able to cut sequentially in accordance with a decrease in the thickness of the log 1.

The height of the blade 6 for cutting along the longitudinal direction of the log 1 is set in advance outside the machine.
The blade 6 is fed toward the log 1 in synchronization with the rotation of the spindle device, and cuts a veneer P having a predetermined thickness from the log 1. A computer (not shown) is used. It controls this.

The veneer P is cut and separated from the log 1 and slides down in the direction of arrow B. Reference numeral 9 denotes a pressure bar, which moves the distance between the tip of the pressure bar and the tip of the blade 6 at a predetermined interval.
It is configured to be able to hold. Reference numeral 11 denotes a thin disk-shaped drive roll. A plurality of drive rolls are fitted on the shaft 12 directly or indirectly via a mounting flange or the like, and are engaged with the pressure bar 9. After the fixing, the outer periphery of the log 1 is driven by the rotation of the motor 30a to drive rolls 13a, 1
It rotates with 3b.

In the vicinity of the log 1, a drive roll 13 a, which is formed in a cylindrical shape along with the drive roll 11 along the longitudinal direction of the log 1 and has a smooth outer surface.
13b and the like are arranged. The drive rolls 13a, 1
3b is divided into a plurality of parts, is supported as a joined block, and is fixed to the shafts 40a and 40b.
The rotation is driven by each drive of b and 30c. Here, by making the surface layers of the drive rolls 11, 13a, 13b rubbery, the frictional force with the log can be increased and the transmission of the drive force can be further ensured.

These drive rolls 13a, 13b are respectively arranged in a moving mechanism (not shown) using a ball screw, a slide guide and the like, and the shaft of the log 1 is changed according to a change in the thickness of the log 1. It is controlled automatically in the direction of the center using a computer or the like (not shown) so that it can advance and retreat.

The large, small, and minimum spindles 2, 3, and 4 constituting the spindle device have bushings or the like fitted around the hollow portion of the shaft center of the engraving shaft 20, and are disposed on the inner diameter thereof. The engraving shaft 20 is rotated by the rotation of a main motor 14 provided on a transmission shaft 17 which is arranged and supported across right and left frames (not shown). The transmission configuration is such that the chain wheel 18 is fixed to the transmission shaft 17 and the chain 19
, A chain wheel 21 fixed to the center outer periphery of the enamel shaft 20 is rotationally driven.

The rotation of the transmission shaft 17 is controlled by the main motor 14.
In addition to the above, a driving force by the hydraulic motor 41 is applied. This is because a large torque is required at the time of starting the cutting of the log 1 and at the time of increasing the diameter thereof, so that it is energized. As a result, the output specification of the main motor 14 can be reduced, and the size can be reduced.

A part of the power of the hydraulic motor 41 is transmitted from a hydraulic source 42 via a hydraulic control unit 45 and a transmission path 44. Here, the hydraulic control unit 45 adjusts the hydraulic pressure output from the hydraulic pressure source 42, the power distribution direction, the flow rate, and the like.

In addition to transmitting power to the hydraulic motor 41, the hydraulic source 42 transmits a power through a hydraulic control unit 45 and a transmission path 43.
The power is also transmitted to the hydraulic motors 30b and 30c. The magnitude of the power is a value that becomes smaller as the log 1 becomes larger, and becomes larger as the log 1 becomes smaller.

This is because, as described above, when the log is cut to a small diameter, the large-diameter spindle 2 holding the log is retracted, and the small-diameter spindle 3 is also retracted, and only the minimum spindle 4 is retained. The area of the chuck for holding the pressure is reduced. Therefore, if the transmission power of the drive by the spindle is not reduced, there is a possibility that the holding becomes uncertain. In this case, the drive rolls 13a, 1
This is because it is desirable to increase the ratio of the rotational driving force to the log 1 of the log 3b.

Therefore, for the hydraulic source 42, the log 1
Looking at the change in generated power from the time of large diameter to the time of small diameter, when the diameter is large, it is distributed to the hydraulic motor 41 mainly for driving the spindle. 30c. Therefore, when the total is considered, only the distribution of power changes according to the diameter of the log 1 and the total value does not vary much.

That is, as compared with the case where the hydraulic pressure sources are separately prepared for the spindle drive and the outer peripheral roll drive, the output specifications are the same and are combined into one, so that the power source of the hydraulic It is possible to improve the degree of utilization as.

In the above description, only the hydraulic motors 30b and 30c among the drive motors from the outer periphery are described as being hydraulically driven. A configuration that is controlled similarly can also be implemented. In this case, the motor 30a can be collectively controlled by hydraulic pressure, so that the overall configuration can be simplified.

FIG. 2 is a partially cutaway front view showing the structure of the veneer race according to the present invention. The same reference numerals are given to the components already described in the figure, and the description is basically omitted.

Referring to FIG. 1, reference numeral 1 denotes a log, which is obtained from the rotation of the hollow shaft 20 by using a large, small,
It is rotationally driven by the smallest spindles 2, 3, 4. Also, the logs 1a, 4a,
Reference numeral 0a denotes a drive roll for rotating the log 1 from the outer periphery thereof by the rotation of a hydraulic motor 30b and its shaft.

Here, each of the spindles 2, 3, and 4 of the spindle device will be described. The large spindle 2 is
The driving rotation of the shaft 20 is rotated through the key 22. The large and small spindles 2, 3 are large and small chucks 25, 24 having claws for wedge-holding the log 1.
Is screwed onto the end of each spindle log, and a key groove 32 is formed in the hollow portion of the hollow shaft 20.
In the hollow portion provided at the axis of the large spindle 2,
Small spindle 3 with key groove 33 carved through key 26
Further, a hollow portion is provided in the axial center portion of the small spindle 3, and the minimum spindle 4 in which a key groove 35 is cut in the hollow portion via a key 34 is inserted and slidable together. And can be driven and rotated.

A bush (not shown) is fitted to the front and rear ends of the hollow shafts of the large and small spindles 2 and 3, and the small and minimum spindles 3 and 4 are arranged so as to be pivotable. Therefore, the spindle device is configured such that the minimum spindle 4 that can be fitted to the small-diameter spindle diameter is configured in the conventional double-type spindle device. A minimum chuck 23 is screwed to the tip of the minimum spindle 4 on the log side, similarly to the large and small spindles 2 and 3.

Further, the advance and retreat of each of the spindles 2, 3, and 4 of the spindle device are performed by an advance / retreat mechanism (not shown).
It moves forward or backward as indicated by the arrow C-D.

The above-mentioned hollow shaft 20 is provided at a shaft end of a transmission shaft 17 which is arranged and supported across right and left frames (not shown) via a shaft joint 16a. The motor 14 is rotationally driven by the rotational drive.

The transmission shaft 17 is connected to a hydraulic motor 41 provided at a shaft end different from that described above via a shaft coupling 16b.
Is also driven to rotate.

Next, a method of cutting the log 1 in the veneer race of this embodiment having the above configuration will be described with reference to FIG. First, when cutting the veneer veneer on the outer periphery of the log 1, the drive rolls 13 a, 13 b and the drive roll 11 are not brought into contact with the outer periphery of the log 1, and the log 1 is driven and rotated only by the spindle device. . At this time, all the power distribution of the hydraulic power source 42 is directed to the hydraulic motor 41 for driving the spindle. Therefore, the spindle device is driven to rotate by the main motor 14 and the hydraulic motor 41.

Thereafter, when the outer periphery of the log 1 has become substantially cylindrical, the drive rolls 13a and 13b and the drive roll 1 are moved.
And the chucks 23, 24, and 2 screwed to the tip of the log 1 side of the spindle device.
5 together with the log 1. Then, as the log 1 is cut to a small diameter, the large spindle 2 and the small spindle 3
Save in order. Therefore, thereafter, only the smallest spindle 4 continues to hold the axial position of the log 1 and continues the support rotation together with the driving rotation from the outer periphery of the log 1.

In response to such a change in the operation, the hydraulic power source 42
The power is distributed by the hydraulic control unit 45 at first with the hydraulic motor 41 being the main and the hydraulic motors 30a and 30b being the slaves.
The control is performed so that the hydraulic motors 30a and 30b become main and the hydraulic motor 41 becomes subordinate later.

In this manner, the cutting is advanced, the cutting tool 6 is retracted slightly before the outer diameter of the minimum spindle 4, and at the same time, the minimum spindle 4 is retracted and the cutting is completed. As a result, cutting can be reliably performed until the log becomes thinner than in the past, and productivity can be improved.

[0044]

As described in detail above, according to the veneer race of the present invention, the use of a drive roll from the outer periphery prevents local rubbing, misalignment and runout, and stabilizes the operation. High quality cutting with uniform thickness can be performed, and the drive by the drive roll is made to follow the spindle drive, so that the surface of the drive roll has a smooth surface without a piercing body to increase the drive transmission force. In addition to the conventional feature that it does not cause a defect that the sticking body of the piercing body remains on the cutting veneer as a result, in addition to the fact that the hydraulic motor is energized to the electric motor that rotationally drives the spindle device, It is possible to reduce the size of the electric motor that needs to be large and to reduce the size of the device.

Further, since the power generated by the hydraulic pressure source is appropriately distributed and controlled between the spindle drive and the outer peripheral drive according to the cutting diameter, the size of the above-described apparatus can be reduced and the utilization of the power source can be improved. .

The number of spindles of the spindle device is 3
By doing so, it is possible to reliably perform cutting until the log becomes smaller than before, and it is also possible to cut a log having a smaller diameter, and it is possible to improve productivity and yield. The core diameter of the log 1 peeled to the vicinity of the minimum spindle 4 is φ48 to φ68 mm.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a partially cutaway front view illustrating the configuration of the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 log 2 large spindle 3 small spindle 4 minimum spindle 6 knife 11 drive roll 13a drive roll 13b drive roll 14 main motor 17 conduction shaft 20 hollow shaft 30b, 30c hydraulic motor 41 hydraulic motor 42 hydraulic Source 43, 44 Transmission path 45 Hydraulic controller

Claims (3)

[Claims] 1. A pair of left and right spindle devices, each of which is capable of driving and rotating at both ends of a log, and a first drive roll device disposed over the tip of a blade over the length of the log. A plurality of second driving roll devices disposed at positions opposite to the blade with the spindle device interposed therebetween; a spindle driving means for driving the spindle device to rotate; Roll drive means for rotating the drive roll device of claim 2, wherein the spindle device has a plurality of spindles each of which is inserted / supported in a hollow portion and which can move forward and backward while being capable of driving and rotating. The veneer race includes an electric motor, and a first hydraulic motor that energizes the electric motor, and the roll driving unit includes at least a second hydraulic motor. 2. The veneer race according to claim 1,
And a control unit for allocating a hydraulic pressure to the first hydraulic motor and a hydraulic pressure to the second hydraulic motor, wherein the control unit controls the second hydraulic motor as the cutting diameter of the log becomes smaller. 2. The veneer race according to claim 1, wherein the allocation of the hydraulic pressure to the veneer is largely controlled. 3. The veneer race according to claim 1, wherein the number of the plurality of spindles in the spindle device is three.