JPH09141618A - Veneer lathe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to interrupt the cutting of a raw lumber if the rotary member of an outer periphery driving mechanism and the outer periphery of the raw lumber are slipped so that the number of revolutions of the raw lumber is lowered. SOLUTION: The circumferential speeds of a raw lumber 9 are measured by circumferential speed measuring members 23 having a plurality of driven rotors aligned in the state that the axes of the raw lumber 9 in the fiber direction are brought into coincidence by a moving mechanism 21 at the time of cutting a single plate and brought into contact with the outer periphery of the lumber 9 to be driven to be rotated, and the number of revolutions of the raw lumbers 9 are calculated by a number-of-revolutions calculating members based on the measured circumferential speeds of the lumbers 9 and the position of the driven rotor with respect to the center of the measured lumbers 9 by a position measuring member 21d. Control means 25 sets the stepwise feeding speed of a planer base 5 by a stepwise feeding mechanism 7 based on the number of revolutions of the lumber 9 calculated based on the driven rotor, compares the number of revolutions of the lumber calculated based on the driven rotor with the theoretical lumber number of revolutions by the circumferential driving mechanism 13, and stops the mechanism 7 when the difference of the both becomes a predetermined value or more.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a veneer lace for cutting veneer veneer (hereinafter referred to as veneer) from raw wood.

[0002]

Conventionally, for example, Japanese Unexamined Patent Publication No. Hei 4
In the veneer race disclosed in Japanese Patent Laid-Open No. 65201, the raw wood is cut while being held by a spindle, the holding state of the raw wood by the spindle is released at an appropriate time during cutting, and the raw wood is rotated by an outer peripheral drive device. The single plate is cut by setting the stepping speed of the plane with the blade on the basis of the measurement value of the raw wood rotation speed measuring device of the rotating body that rotates in contact with the outer periphery of the veneer.

However, in the above-mentioned conventional veneer lace, when cutting a veneer while rotating the raw wood by the outer peripheral drive device, the rotating member of the outer peripheral drive device and the outer periphery of the raw wood slip depending on the material of the raw wood. As a result, the driving force of the outer peripheral drive device cannot be transmitted to the log and the rotation speed of the log decreases. When the cutting of the raw wood is continued in this state, it is possible to cut the veneer having the set thickness, but there is a problem that the cutting speed becomes slow and the productivity deteriorates.

Further, the center part of the raw wood may be rotted and partially fragile in the fiber direction. When piercing force, frictional force, cutting resistance, etc. of the rotating member of the outer peripheral drive device act on such a fragile portion, it will be destroyed, but as a raw wood itself, the rotating body will be in a non-destructive location. When in contact with each other, the veneer can be machined, but the veneer cut in this state has a broken portion that deteriorates the quality of the veneer and is a defective product. Further, the broken portion of the raw wood becomes scrap and becomes clogged between other members, which becomes an obstacle for cutting the single plate, which is a factor that deteriorates the productivity.

The present invention has been invented in order to solve the above-mentioned conventional drawbacks, and its problem is that the rotating member of the outer peripheral drive mechanism and the outer circumference of the raw tree slip and the number of rotations of the raw tree. The purpose of the present invention is to provide veneer lace which can prevent the productivity from being reduced by interrupting the cutting of the raw wood in the case where the deterioration occurs.

Another object of the present invention is to prevent cutting of a defective veneer by interrupting the cutting when the raw wood is partially broken during cutting, and to improve the production as a whole. It is to provide veneer lace that can improve efficiency.

Still another object of the present invention is to provide a veneer lace which can prevent defective cutting due to scraps of raw wood destroyed during cutting.

[0008]

According to a first aspect of the present invention, while the raw wood is rotated by an outer peripheral drive mechanism that abuts the outer circumference of the raw wood and applies a rotational driving force to the raw wood, the walk mechanism moves toward the raw wood. The veneer is moved and the veneer is cut by the cutting blade that abuts the outer circumference of the raw wood. When cutting a veneer, a plurality of driven rotors are arranged by the moving mechanism with their axes aligned in the fiber direction of the log. The respective speeds are measured, and based on the measured peripheral speed of the raw wood and the position of the driven rotating body with respect to the center of the raw wood measured by the position measuring member, the respective rotation speed calculating members calculate the respective rotation speeds of the raw wood. Then, the control means sets the stepping speed of the plane by the stepping feed mechanism based on the respective rotation speeds of the raw wood calculated based on the driven rotary body, and the respective raw wood rotation speeds calculated based on the respective driven rotary bodies. And the theoretical rotation speed of the raw wood by the outer peripheral drive mechanism are compared, and when the difference between the two becomes equal to or more than a predetermined value, the step feed mechanism is stopped and the cutting of the veneer is finished.

According to a second aspect of the present invention, the raw wood is rotatably supported by the spindle of the center drive mechanism, and the outer peripheral drive mechanism makes contact with the outer circumference of the raw wood to apply a rotational driving force to the raw wood to rotate the raw wood. The veneer is moved toward the log by the feeding mechanism and the veneer is cut by the cutting blade that abuts the outer circumference of the log. When cutting a veneer, a plurality of driven rotors are arranged by the moving mechanism with their axes aligned in the fiber direction of the log. The respective speeds are measured, and based on the measured peripheral speed of the raw wood and the position of the driven rotating body with respect to the center of the raw wood measured by the position measuring member, the respective rotation speed calculating members calculate the respective rotation speeds of the raw wood. Then, the control means sets the stepping speed of the plane by the stepping feed mechanism based on the respective rotation speeds of the raw wood calculated based on the driven rotary body, and the respective raw wood rotation speeds calculated based on the respective driven rotary bodies. And a theoretical rotation speed of the raw wood by the outer peripheral drive mechanism are compared, and when the difference between the two becomes a predetermined value or more,
The stepping mechanism is stopped to control cutting of the veneer.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

1 to 3, a plane 3 is supported on a frame 3 of a veneer race 1 so as to be capable of reciprocating in a direction of an arrow shown in the drawing, and a stepping mechanism 7 is connected to the plane 5.
The step feed mechanism 7 is composed of a feed screw 7a such as a ball screw and a variable speed drive member 7b such as a servo motor, and reciprocates the plane 5 at an arbitrary rapid feed rate and a constant step feed rate by a control means 25 described later. To move. Variable speed drive member 7
b is a position measuring member 7c including a rotary encoder
Is attached and the position measuring member 7c is cut into a raw wood 9
The position of the cutting blade 11 with respect to the rotation center of is measured.

An outer peripheral drive mechanism 13 is provided on the upper portion of the plane 5. The outer peripheral drive mechanism 13 is mounted on the outer periphery of a drive shaft 13a, which is supported by a plane 5 so as to be elastically displaceable in the direction shown by an arrow in a predetermined range, at an appropriate interval in the axial direction. It is composed of a plurality of rotating bodies 13c having piercing bodies 13b, a constant speed driving member 13d such as a three-phase induction electric motor, and the like, and is controlled by the control means 25 at an apparently constant standard driving speed (of standard hardness). At the standard drive speed when driving the log 9, the rotating body 13c that pierces the outer peripheral portion of the log 9 before the cutting edge of the cutting blade 11 is rotated to supply at least a part of the driving force required for cutting the log 9. .

A plurality of pressure bars 15 are mounted on the pressure bar mounting base 5a of the plane base 5 so as to be positioned between the pressure bars 15 and the respective rotating bodies 13c. Each pressure bar 15 presses its tip end against the outer peripheral surface of the log 9 near the boundary between the log 9 and the veneer to be cut.

A center drive mechanism 17 is attached to the frame 3. The center drive mechanism 17 is a pair of left and right spindles 17a provided so as to be movable back and forth in the axial direction of the log 9 by a moving mechanism (not shown) such as a hydraulic cylinder.
A variable speed driving member 17b such as a DC electric motor for rotating each spindle 17a, and a rotation speed measuring member 1 such as a rotary encoder for detecting the rotation speed of the spindle 17a.
7c, and each spindle 17a that is pressed against the center of each mouth of the log 9 by the control means 25 is rotated at an arbitrary speed or a speed that follows the log drive speed of the outer peripheral drive mechanism 13 to cut the log 9. Supplies part of the driving force required.

A log support mechanism 19 is provided on the frame 3 located below an imaginary line connecting the spindles 17a. The log support mechanism 19 is supported by a support frame 19a that is movably supported in the vertical direction with respect to the frame 3, and rotatably on the upper surface of the support frame 19a in the axial direction of the log 9 at an appropriate interval. A plurality of support rollers 19
b, a variable speed drive member 19d such as a servomotor for rotating a moving member 19c such as a ball screw connected to the support frame 19a, and a support roller for the rotation center of the raw wood 9 based on the rotation amount of the variable speed drive member 19d. Position measuring member 19e such as a rotary encoder for measuring the position of 19b
The control roller 25 drives the variable speed drive member 19d at a predetermined timing of cutting the raw wood to support the support roller 19b.
By abutting against the outer peripheral surface of the lower part of the log 9, the bending of the log 9 in the vertical direction is mainly regulated.

The log support mechanism 19 may be provided on a moving frame 21a of a moving mechanism 21 described later. In this case, the support frame 19a connected to the moving member 19a may be moved obliquely upward to bring the support roller 19b into contact with the outer periphery of the lower portion of the raw wood 9 to support it.

A moving mechanism 21 is provided on the frame 3 on the opposite side of the outer peripheral drive mechanism 13 centering on the spindle 17a. The moving mechanism 21 rotationally drives a moving frame 21a, which is parallel to the axis of the log 9 and is supported so as to be capable of reciprocating in a direction orthogonal to the axis, and a moving member 21b such as a ball screw connected to the moving frame 21a. A variable speed driving member 21c such as a servo motor, and a position measuring member 21d such as a rotary encoder which measures the positions of driven rotary bodies 23b and 23c, which will be described later, with respect to the rotation center of the log 9 based on the driving amount of the variable speed driving member 21c. It consists of

A moving frame 2 facing the outer peripheral surface of the log 9.
A part of the rotation speed measuring mechanism 23 is attached to 1a. The rotation speed measuring mechanism 23 is rotatably supported by bearings 23a provided on the moving frame 21a.
The two driven rotors 23b and 23c arranged in series in the axial direction, each having an axis parallel to the axis and the axis length being approximately 1/2 of the axis length of the log 9. A transmission member 23h such as a timing belt is attached to the rotating bodies 23b and 23c.
· Each driven rotor 23b connected via 23i
The peripheral speed measuring members 23d and 23e such as rotary encoders that measure the peripheral speed of 23c, and the positions of the driven rotors 23b and 23c relative to the rotation center of the raw wood 9 indirectly measured by the position measuring member 21d (diameter of the raw wood 9 ) And the peripheral speed measuring members 23d and 23e and the peripheral speeds of the raw wood 9 that are used to calculate the rotational speed of the respective raw wood 9 based on the relative relationship between the rotational speed calculation members 23f and 23g. The number calculation members 23f and 23g respectively output the calculated rotation speed data regarding the rotation speed of the raw wood 9 to the control means 25.

It should be noted that the above-described rotation speed calculation members 23f and 23g
Is provided separately from the control means 25, but it goes without saying that the rotational speed of the raw wood 9 may be arithmetically processed based on the respective data by the arithmetic function of the control means 25.
Further, the peripheral speed of the raw wood 9 is measured by the two driven rotary bodies 23b and 23c, but three or more driven rotary bodies whose axial length is substantially equal to the axial length of the raw wood 9 are used. You may comprise by. Further, the outer peripheral surfaces of the driven rotating bodies 23b and 23c are subjected to processing such as grooving (knurling), rubber coating, uneven portions, etc., to increase the friction coefficient with respect to the raw wood 9, so that the raw wood 9 is reliably followed by the rotation. You may do it. Further, a position measuring member is provided for each of the driven rotary bodies 23b and 23c so that each driven rotary body 23 with respect to the center of the log 9 can be provided.
You may comprise so that the position of b * 23c may be measured. The driven rotors 23b and 23c also serve as backup rolls that regulate the bending of the raw wood 9 during cutting.

The control means 25 can individually control each member manually or semi-automatically during the preparation for cutting or after the completion of cutting. However, at the time of cutting raw wood, if each member is automatically controlled in the following manner. Good.

That is, at the beginning, when the log 9 having an irregular outer shape is idled by the center drive mechanism 17, the drive speed of the center drive mechanism 17 is used when the board 5 is moved closer to the log 9 by the stepping mechanism 7. And the fast-forward speed of the step feed mechanism 7 is arbitrarily controlled manually or semi-automatically. However, when the raw wood 9 and the cutting blade 11 come into contact with each other, the drive speed of the center drive mechanism 17 is controlled so as to be synchronized with or follow the raw wood drive speed of the outer peripheral drive mechanism 13, and the step feed mechanism 7 also advances. The speed is controlled so as to follow the rotation speed of the spindle 17a measured by the rotation speed measurement member 17c, and cutting is started while rotating the raw wood 9 by both the outer peripheral drive mechanism 13 and the spindle 17a.

Next, when the raw wood 9 is cut so that the cutting progresses and the outer shape becomes substantially cylindrical, the driver manually sends a signal to the control means 25, and based on the signal from the control means 25. The support frame 19a is moved upward to move the support roller 1
9b to the outer peripheral surface of the lower part of the raw wood 9 and the moving frame 21a to the spindle 17a side to move the driven rotor 23b.
23c is brought into contact with the lateral outer peripheral surface of the raw wood 9, respectively.

A support roller 19b is provided on the outer peripheral surface of the raw wood 9.
And the amount of movement of the support frame 19a and the moving frame 21a when the driven rotors 23b and 23c are respectively brought into contact with each other are preset in the position data of the cutting blade 11 with respect to the rotation center of the raw wood 9 measured by the position measuring member 7c. A veneer 1
It is determined based on a spiral curve considering the thickness of 6. The contact between the support roller 19b and the driven rotating bodies 23b and 23c on the outer peripheral surface of the log 9 indicates that the position measuring member 19
e and the respective position data measured by the position measuring member 21d. Then, after the support roller 19b and the driven rotary bodies 23b and 23c are brought into contact with the raw wood 9, the variable speed drive members 19d and 21c are operated following the drive state of the variable speed drive member 7c.

Due to the abutment, the driven rotary bodies 23b and 23c
When the raw wood 9 is driven to rotate in accordance with the rotation of the raw wood 9, the peripheral speed measuring member 23 connected to the driven rotors 23b and 23c, respectively.
The peripheral speed of the log 9 is measured by d · 23e. The rotation speed calculation members 23f and 23g are respectively based on the measured peripheral speed data of the raw wood 9 and the position data of the peripheral surfaces of the driven rotors 23b and 23c with respect to the rotation center of the raw wood 9 measured by the position measuring member 21d. The rotation speed of the raw wood 9 is calculated and the raw wood rotation speed data is output to the control means 25.

When the rotation speed data of the raw wood is input, the control means 25 separates the spindles 17a from the surface of the raw wood 9 to release the holding, and the speed of the feed mechanism 7 is input. Control is performed so as to follow one of the rotation speed data of the raw wood 9, and the cutting is continued while applying the rotational driving force by the rotary body 13c to the raw wood 9 held by the support roller 19b and the driven rotary bodies 23b and 23c. Let

Now, with respect to the outer peripheral surface of the raw wood 9, each rotating body 13
When c is abutting substantially uniformly and the raw wood 9 is rotated, the peripheral speed of the raw wood 9 measured by the peripheral speed measuring device 23 and the peripheral speed of the rotating body 13c are substantially the same. When a plurality of rotating bodies 13c slip on the outer peripheral surface of 9, the peripheral speed of the raw wood 9 becomes slower than the peripheral speed of the rotating body 13c, and as a result, the raw wood rotation calculated by the rotation speed calculation members 23f and 23g. The value of the numerical data is smaller than the value of the theoretical rotation speed of the raw wood 9 by the outer peripheral drive mechanism 13.

At this time, the control means 25 determines the values of the respective raw wood rotation speed data calculated by the rotation speed calculation members 23f and 23g in step 31 shown in FIG. 3 and the theoretical rotation speed of the raw wood 9 by the outer peripheral drive mechanism 13. The value is compared to determine whether or not the difference between at least one (both in this case) of the calculated rotation speed data of the raw wood 9 and the theoretical rotation speed of the raw wood 9 is a predetermined value or more, If the determination is YES, in step 33, the operation of the step feed mechanism 7, the log support mechanism 19 and the moving mechanism 21 is stopped to automatically terminate the cutting. If the determination in step 31 is NO, the cutting operation of the raw wood 9 is continued.

The theoretical number of revolutions of the raw wood 9 by the outer peripheral drive mechanism 13 is the drive speed of the outer peripheral drive mechanism 13 (the drive speed does not necessarily have to be constant like the standard drive speed described above, and its control speed is Data may be variable speed if it can be specified) can be calculated by dividing by the data on the diameter of the raw wood 9 measured with the progress of cutting by the position measuring member 7c of the stepping mechanism 7,
This function may be executed by the arithmetic function of the control means 25.

Also in the following cases, the cutting of the raw wood 9 is completed by the above-mentioned operation.

That is, the driven rotors 23b and 23c are connected to the raw wood 9
When the outer peripheral surface of the raw wood 9 is cut by being brought into contact with the outer periphery of the raw wood 9, the driven rotary body 2 other than the driven rotary bodies 23b and 23c.
The rotating body 13c, the pressure bar 15, and the cutting blade 11 are in pressure contact with the side opposite to 3b and 23c. For this reason, when cutting progresses and the central portion of the raw wood 9 is cut, the material of the central portion itself is often fragile, and the strength is partially different in the fiber direction. In a part of the fiber direction in 9, for example, a portion where one driven rotary body 23c is in pressure contact may be destroyed. In this case, since there is nothing to rotate the driven rotary body 23c, the peripheral speed of the driven rotary body 23c becomes gradually smaller than that of the other driven rotary body 23b.

Even in such a situation, the control means 25 separately sets the theoretical rotation speed of the raw wood 9 by the outer peripheral drive mechanism 13 and the respective rotation speeds of the raw wood 9 calculated by the respective rotation speed calculation members 23f and 23g. For comparison, when the difference between the rotation speed of the raw wood 9 calculated based on the rotation of the one driven rotary body 23c and the theoretical rotation speed of the raw wood 9 exceeds a predetermined limit, the above step 33 Ends the cutting work.

As a result, it is possible to prevent the scraps of the destroyed raw wood 9 from being jammed between the respective members to cause defective cutting, and it is possible to eliminate unnecessary cutting work and improve the productivity of the veneer.

In the above-described embodiment, after the spindle 17a is separated from the log 9, the step feed speed of the step feed mechanism 7 is made to follow the rotation speed of the log 9 calculated by the rotation speed measuring member 17c. It is assumed that the stepping mechanism 7 is controlled before the spindle 17a is separated from the log 9.
May be controlled by the rotation speed of the raw wood 9 calculated by the rotation speed measurement member 17c.

Further, in the above-mentioned embodiment, when the diameter of the log 9 to be cut reaches a predetermined set value, the spindle 17a is separated from the log 9 to interrupt the supply of the rotational driving force. Even in this case, the spindle 17a may not be separated from the log 9 and only the supply of the rotational driving force may be interrupted to be driven to rotate. In this case, the spindle 17a is composed of a multi-stage type spindle which is divided into a plurality in the radial direction, and when the raw wood 9 has a large diameter, power is also supplied from the spindle to cut the raw wood 9 to reduce its diameter. Therefore, when the raw wood 9 is supported one step at a time from the outside in the radial direction and the raw wood 9 is supported only by the minimum diameter spindle, the spindle may be driven to rotate, and only the minimum diameter spindle is driven from the beginning. You may be free.

Further, the structure of the veneer lace is shown in FIG.
As shown in FIG. 5, a plurality of drive rotors 43, 45, 47 are provided at appropriate intervals around the outer circumference of the raw wood 41 so as to be movable toward the center of the raw wood 41, and the drive rotor 43, which contacts the outer circumference of the raw wood 41. It may be a structure in which the log 41 is rotated by 45/47. In this case, the drive rotor 43
The rotation speed of the raw wood 41 may be measured by using any one of 45 and 47 as the same configuration as the driven rotary bodies 23b and 23c in the above-described embodiment. The present invention can be applied to various types of veneer lace known in the related art, but in that case, it is necessary that the step feed speed of the step feed mechanism can be finely adjusted.

[0036]

Therefore, according to the present invention, when the rotation member of the outer peripheral drive mechanism and the outer circumference of the raw wood slip and the rotation speed of the raw wood decreases, the cutting of the raw wood is interrupted to reduce the productivity. Can be prevented. Further, according to the present invention, when the raw wood is partially broken during cutting, the cutting is interrupted to prevent the defective veneer from being cut, and the overall production efficiency can be improved. Further, according to the present invention, it is possible to prevent the occurrence of cutting defects due to the scraps of the raw wood that are destroyed during cutting.

[Brief description of the drawings]

FIG. 1 is a front view showing the outline of veneer lace.

FIG. 2 is a plan view showing the outline of veneer lace.

FIG. 3 is a flowchart showing an outline of control.

FIG. 4 is a front view showing another embodiment of the veneer lace.

[Explanation of symbols]

 1 Veneer Race 5 Plane 7 Stepping Mechanism 9 Log 11 Cutting Blade 13 Peripheral Drive Mechanism 17 Center Drive Mechanism 19 Log Support Mechanism 21 Moving Mechanism 23 Rotation Speed Measuring Mechanism 23b ・ 23c Driven Rotating Body 25 Control Means

Claims (3)

[Claims] 1. An outer peripheral drive mechanism that abuts an outer circumference of a raw wood to apply a rotational driving force to the raw wood, and a stepping mechanism that is capable of advancing and retreating toward the raw wood so that a cutting blade abuts the outer circumference of the raw wood. With a plane, a moving mechanism provided so as to be able to move back and forth toward the log, and a plurality of driven rotating bodies that are arranged with their axes aligned in the fiber direction of the log with respect to the moving mechanism and contact the outer circumference of the log. A plurality of peripheral speed measuring members that respectively measure the peripheral speed of the raw wood, a position measuring member that measures the position of each driven rotating body with respect to the rotation center of the raw wood, and the measured values by the peripheral speed measuring member and the position measuring member. A plurality of rotation speed calculation members for respectively calculating the rotation speeds of the above, and the rotation speed of the raw wood calculated on the basis of one arbitrary driven rotation body to set the walking speed of the plane by the stepping mechanism, and each driven rotation body. Each calculated by The log speed of the log and the theoretical log speed of the peripheral drive mechanism are compared, and the difference between at least one log speed obtained by each driven rotor and the theoretical log speed exceeds a predetermined value. Veneer race equipped with control means for stopping and controlling the feed mechanism when it reaches the limit. 2. A center drive mechanism having a spindle for rotatably supporting the raw wood, an outer peripheral drive mechanism for abutting the outer circumference of the raw wood to apply a rotational driving force to the raw wood, and a walk mechanism for directing the raw wood toward the raw wood. A plane which is provided so as to be able to move forward and backward and a cutting blade is brought into contact with the outer circumference of the raw wood, a moving mechanism which is provided so as to move forward and backward toward the raw wood, and a state in which the axis of the moving mechanism is aligned with the axis of the raw wood. And a plurality of peripheral speed measuring members that respectively measure the peripheral speed of the raw wood by a plurality of driven rotary bodies that are in contact with the outer circumference of the raw wood, and a position measuring member that measures the position of each driven rotary body with respect to the rotation center of the raw wood. , A plurality of rotation speed calculation members that respectively calculate the rotation speed of the raw tree from the measured values by the peripheral speed measurement member and the position measurement member, and the rotation speed of the raw tree calculated based on one arbitrary driven rotor. Plane by feeding mechanism The step feed speed is set and the respective raw wood rotation speeds calculated by the respective driven rotary bodies are compared with the theoretical raw wood rotation speed by the outer peripheral drive mechanism, and at least one of the driven rotary bodies is obtained. A veneer race having a control means for stopping and controlling the step feed mechanism when a difference between the log speed of the log and the theoretical log speed of the log exceeds a predetermined value. 3. The veneer race according to claim 1 or 2, wherein each driven rotor also serves as a backup roll.