JP2007090519A - Method and device for detecting machining axis and maximum radius of gyration of material wood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the machining axis and maximum radius of gyration of material wood by a simple operation. <P>SOLUTION: Each distance to the periphery of the material wood W rotated around a provisional axis 3b is detected every prescribed rotation angle of the material wood W by distance detectors 9a-9c. The rotation angles of first rotary arms 10a-10e which are set in parallel in the longitudinal direction of the material wood, have contact surfaces 11a'-11e' contacted with the periphery of the material wood, and rotate around a shaft center line O are detected by second angle detectors 19a-19e. First, the machining axis HS of the material wood W is calculated on the basis of each distance. Next, the lengths of perpendiculars from spots G1-G6 where a cross section passing through both ends of each contact surface in the longitudinal direction and crossing at right angles with the provisional axis 3b and the machining axis cross to each contact surface 11a'-11e' are obtained every prescribed rotation angle. The maximum of the obtained lengths of the perpendiculars is set as the maximum radius of gyration of the material wood W. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a turning axis that can most effectively turn a log with a veneer race, and a turning axis and a maximum turning radius detection method for detecting the maximum turning radius of the log about the turning axis. And an apparatus.

As a conventional technique, for example, as shown in Japanese Patent Application Laid-Open No. Hei 6-293002, a plurality of contact-type or non-contact-type detection units in which the detection areas are almost closely connected over the entire length of the raw wood correspond to the outer circumference of the raw wood. Then, the raw wood is rotated around the temporary shaft core to detect the contours of the cross sections orthogonal to the temporary shaft core in each detection area, and the turning shaft core of the raw wood is based on two or more cross-sectional contour data of them. Further, the maximum turning radius of the raw wood around the turning axis is obtained based on all the cross-sectional contours of the respective detection areas.
The reason for obtaining the maximum turning radius of the raw wood is as follows.
In a veneer lace for turning a raw wood, the raw wood is supported by a spindle and rotated, and a gantry provided with a cutter is moved toward the raw wood by a set distance per rotation of the raw wood. Here, if the distance between the spindle and the base is too large when starting the cutting of the raw wood and the base is too far from the raw wood, it takes time until the base approaches and the raw wood is cut, resulting in poor productivity. Therefore, the maximum turning radius when the log is supported by the spindle is obtained in advance, and the log is supported by the spindle after turning off the stand at a position corresponding to the value and turning.
JP-A-6-293002

  In the prior art, the maximum turning radius of the raw wood centering on the turning axis is obtained. However, since the calculation is complicated, it takes time to obtain and the productivity is poor.

The present invention has been invented in order to solve the above-described conventional problems, and obtains the length of a perpendicular line from a selected location on the obtained turning axis to the contact surface of each rotating arm. The maximum value of these values is the maximum turning radius of the raw wood around the turning axis.
The turning axis is the center of rotation of the raw wood that can be effectively turned when the raw wood is turned with a veneer race.

  According to the present invention, the maximum turning radius of the raw wood around the turning axis of the raw wood can be obtained by simple computation, and the time for computation is shortened and the productivity is improved.

An embodiment will be described with reference to FIGS. 1 is a schematic side view, FIG. 2 is an AA view of FIG. 1, and FIG. 3 is a BB view of FIG.
Reference numerals 3 and 3a denote centering spindles (hereinafter referred to as first spindles) as a pair of clamping members. As shown in FIG. 3, the first spindles 3 and 3a have an axis center line 3b serving as a temporary axis. They are on the same horizontal straight line, are opposed to each other, are movable forward and backward in the Z direction indicated by arrows, and are rotatably supported by a base (not shown).
One of the first spindles 3 is connected to an electric motor 5 such as a servo motor, and the operation of the electric motor 5 rotates and stops the first spindle 3. A first angle detector 7 such as an absolute rotary encoder is attached to the electric motor 5, and sends information corresponding to the rotation angle of the spindle 3 to the controller 10.

Reference numerals 9a, 9b and 9c are distance detectors such as a laser distance meter for detecting the distance from the axial center line 3b to the outer circumference of the log.
As will be described later, these distance detectors have bases (in the vicinity of both ends in the Z direction in the Z direction of the raw wood sandwiched between the first spindles 3 and 3a and in the middle thereof at locations separated by a distance L1 from the axial center line 3b (see FIG. (Not shown).
These distance detectors 9a, 9b, and 9c are composed of a light source that emits light toward the axial center line 3b and a light receiving unit that receives reflected light from the outer circumference of the log, as indicated by a one-dot chain line, The distance between the distance detector and the outer circumference of the log is measured, and the detected distance information is sent to the controller 10.
The controller 10 calculates the distance from the axial center line 3b to the outer circumference of the log by subtracting the measured distance between each distance detector and the outer circumference of the log from the distance L1.

As shown in FIGS. 1 and 2, 10a, 10b, 10c, 10d, and 10e are attached to a base (not shown) with a shaft 13 having an axial center line O parallel to the axial center line 3b. They are the 1st rotation arm, the 2nd rotation arm, the 3rd rotation arm, the 4th rotation arm, and the 5th rotation arm which were provided in the line direction so that rotation was possible.
Each of the rotating arms has a flat surface parallel to the axis center line O and has substantially the same width in the axis center line direction of the shaft 13 as shown in FIGS. Contact members 11a, 11b, 11c, 11d, and 11e having contact surfaces 11a ′, 11b ′, 11c ′, 11d ′, and 11e ′ are fixed.
The rotating arms are positioned by the collar 15 so that the contact surfaces are close to each other in the axial center line direction so as not to interfere with the rotation.
Further, as shown in FIGS. 1 and 3, each rotating arm is rotatable with the tip of the piston rod 17a of the cylinder 17 in which the end portion of the main body is rotatably attached to a base (not shown). The rotation arms can be rotated up and down by the operation of each cylinder 17.
In addition, when the piston rod 17a is most submerged in the cylinder 17 main body by the operation of the respective cylinders 17, as shown in FIGS. 1 and 3, the respective rotating arms have contact surfaces 11a ′, 11b ′, 11c ′, 11d ′ and 11e ′ are set to stand by on the same horizontal plane XX passing through the axis center line O, and this state is set as an initial state.
Further, as will be described later, when the piston rod 17a is advanced from the cylinder 17 main body by continuously injecting compressed air, the abutting surfaces of the piston rod 17a continue to follow the shape of the outer periphery of the rotating raw wood. Each of the rotating arms has a sufficient length necessary for reciprocatingly rotating in the direction of the arrow in FIG.

On the other hand, as shown in FIG. 2, each of the rotating arms 10a, 10b, 10c, 10d, and 10e has a second angle detector 19a, 19b, 19c, such as an absolute rotary encoder that generates a signal according to the angle of rotation. 19d and 19e are connected. By these second angle detectors, the respective horizontal arms XX and the respective contact surfaces 11a ′ and 11b ′ when the respective rotating arms reciprocally rotate in the direction of the arrow in FIG. 1 following the shape of the outer periphery of the log. , 11c ′, 11d ′, and 11e ′ are detected.
In the second angle detector, the angle as described above is obtained, but the angle formed by the horizontal plane XX with respect to a line connecting the axis center line O and the axis center line 3b (hereinafter referred to as a reference line) is constant and predetermined. Since it is known, if the angle detected by the second angle detector is subtracted from the certain angle, the angle formed by the contact surface of each rotating arm with respect to the reference line can be obtained. However, as will be described later, these angles are necessary for obtaining the length of the perpendicular from the selected location of the turning axis HS to each contact surface, and were obtained by the second angle detector. As a result, the length of the perpendicular can also be obtained from the angle.
Information corresponding to the rotated angle obtained from the second angle detectors 19a, 19b, 19c, 19d, and 19e is sent to the controller 10 to calculate the angle.
Further, as will be described later, the controller 10 outputs a signal for operating the electric motor 5, the cylinder 17 and the like, and calculates a necessary value based on the sent information.

Next, the operation of the embodiment will be described.
In the initial state, as shown in FIG. 3, the piston rod 17a is most submerged in the cylinder 17 body, and the contact surfaces 11a ′, 11b ′, 11c ′, 11d ′, and 11e ′ of the rotating arms are the same as described above. Waiting on the horizontal plane XX.
In this state, as shown in FIG. 4, the log W is supplied between the first spindles 3 and 3a by a known automatic supply member (not shown), and the operation from the controller 10 which receives the input signal of the driver. With the signal, as shown in FIG. 5, the first spindle 3, 3 a is advanced in the direction of the arrow Z approaching each other, and the log W is sandwiched.
After a sufficient time has passed for the clamping, a signal from the controller 10 continues to inject compressed air into each cylinder 17 to operate all the cylinders 17 and advance the piston rods 17a.
Therefore, each of the rotating arms 10a, 10b, 10c, 10d, and 10e is rotated and lowered, and the rotating surfaces 10a, 11b ', 11c', 11d ', and 11e' come into contact with the outer periphery of the log W. The descent is stopped.
Therefore, FIG. 6 shows only the case of the first rotating arm 10a, but the respective contact surfaces 11a ′, 11b ′, 11c ′, 11d ′ are obtained by the second angle detectors 19a, 19b, 19c, 19d, 19e. , 11e ′ are sent to the controller 10, and the controller 10 determines the angles θ (hereinafter referred to as “rotation angles”) θ between the horizontal plane XX and the respective contact surfaces.
FIG. 7 is a partial explanatory view of the inner side from the outer side in the direction of the arrow in FIG.

On the other hand, after the sufficient time has elapsed, the distance detectors 9a, 9b, and 9c measure the distances from the distance detectors to the outer circumference of the log, that is, only the distance detector 9a in FIG. Each information is sent to the controller 10, and the controller 10 obtains a value obtained by subtracting L2 from L1 as radius information.
Next, after a sufficient time has elapsed for the contact surfaces 11a ′, 11b ′, 11c ′, 11d ′, and 11e ′ to contact the outer periphery of the raw wood, the motor 5 is driven by a signal from the controller 10 to The spindle W is rotated at least once in the arrow direction by one spindle 3, 3a.
In the rotation of the log W, the controller 10 determines each distance at every predetermined rotation angle (for example, every 10 degrees) of the first spindles 3 and 3a obtained from the first angle detector 7 in the same manner as described above. The detectors 9a, 9b, and 9c determine the respective distances from the axial center line 3b to the outer periphery of the raw wood, and the second angle detectors 19a, 19b, 19c, 19d, and 19e determine the rotation angles.
That is, the distance detectors 9a, 9b, and 9c measure the distance corresponding to L2 in FIG. 6 at each predetermined rotation angle, and obtain the distance from the axial center line 3b to the outer periphery of the log W by L1-L2.
Next, each point determined by the distance from the axis center line 3b obtained at each predetermined rotation angle is connected by a straight line to the rotation direction of the log W, so that both the vicinity of the both ends in the direction of the axis center line 3b of the log W and the middle A polygon is assumed at three locations of the part.
Next, the maximum inscribed circles in these polygons are respectively calculated, and further, a straight line passing through the center of the maximum right cylinder passing through each maximum inscribed circle is used as a reference point at a predetermined position of the axial center line O. Obtained by three-dimensional coordinates, this is defined as a turning axis HS.
The turning axis HS is shown in FIG. 8, for example, in the same view as FIG.

On the other hand, the rotating arms 10a, 10b, 10c, 10d, and 10e with respect to the rotating log W have their contact surfaces 11a ′, 11b ′, 11c ′, 11d ′, and 11e ′ in contact with the outer periphery of the log W. It reciprocates around the shaft 13 following the shape of the outer periphery.
Therefore, the controller 10 calculates the rotation angle of each rotation arm based on information from the second angle detectors 19a, 19b, 19c, 19d, and 19e for each predetermined rotation angle.
However, as shown in FIG. 8, for example, each contact surface reciprocally rotates while hitting the most protruding portion in the radial direction of the outer periphery of the log, but the corresponding portion is the axial center line direction of the axial center line 3b, that is, the figure. It is impossible to determine which position of each abutment surface is in the left-right direction.
Therefore, for example, the rotation angle obtained by the contact surfaces 11a ′, 11b ′, 11c ′, 11d ′ in the left-right direction of FIG. In the contact surface 11e ′, values are obtained as values in two cross sections indicated by a one-dot chain line that passes through the left end and the right end and is perpendicular to the axis center line 3b.
For the sake of explanation, as shown in FIGS. 7 and 8, a cross section indicated by a one-dot chain line passing through the left edge of the contact surface 11a ′ and perpendicular to the axial center line 3b is referred to as the first cross section A1. The cross section passing through the left edge of the contact surface 11b ′ is the second cross section A2, the cross section passing through the left edge of the contact surface 11c ′ is the third cross section A3, and the cross section passing through the left edge of the contact surface 11d ′ is the fourth. The cross section passing through the cross section A4 and the left edge of the contact surface 11e ′ is referred to as a fifth cross section A5, and the cross section passing through the right edge of the contact surface 11e ′ is referred to as a sixth cross section A6.

In each of these cross sections, the controller 10 calculates a rotation angle, and among these calculated rotation angles, in each cross section between adjacent contact surfaces, both the contact surfaces are as follows. The smaller value is selected and stored, and the reason will be described later.
That is, in the first cross section A1, the rotation angle obtained from the first rotation arm 10a is stored.
In the second cross section A2, the rotation angle obtained from the first rotation arm 10a is compared with the rotation angle obtained from the second rotation arm 10b, and the smaller value is stored.
Similarly, in the third section A3, the rotation angle obtained from the second rotation arm 10b is compared with the rotation angle obtained from the third rotation arm 10c, and the smaller value is hereinafter referred to as the fourth section A4. The smaller value of the fifth cross section A5 and the rotation angle obtained from the rotation arm sandwiching each cross section is stored.
In the sixth section A6, the rotation angle obtained from the fifth rotation arm 10e is stored.

Next, the controller 10 controls the first cross-section A1, the second cross-section A2, the third cross-section A3, the fourth cross-section A4, the fifth cross-section A5, and the sixth cross-section for each predetermined rotation angle by the stored rotation angles. In A6, the distance between the turning axis HS and each contact surface is obtained.
In this case, as described above, in order to make the axis center line of the second spindle of the veneer race coincide with the turning axis line HS, the length from the turning axis line HS to the respective furthest points, that is, the respective cross sections and the turning axis. What is necessary is just to obtain | require the length between each intersection with the core line HS and the point where the perpendicular to the turning axis line HS at each intersection intersects each contact surface.
However, the length of the perpendicular line is almost the same as the length from each abutment surface to each intersection of each cross section and the turning axis line HS in each cross section.
Therefore, here, a case where the above method is used for simple calculation is shown.
For example, as shown in FIG. 6, each rotating arm first pivots down with respect to the log W sandwiched between the first spindles 3, 3 a, and each contact surface 11 a ′, 11 b ′, 11 c ′, 11 d ′, A case where 11e ′ hits the outer periphery of the log W as shown in FIG. 8 will be described.
In this case, referring to FIG. 9 showing only the first cross section A1 side of the contact surface 11a ′, if the point where the first cross section A1 and the turning axis line HS intersect is G1, the G1 will contact the contact surface 11a ′. Find the length of the vertical line.

Therefore, in FIG. 9, only the length and angle necessary for obtaining the length of the perpendicular are shown in FIG.
That is, in FIG.
Line OX: a horizontal line extending the line XX and passing through the center of rotation O,
Line OY: a line passing through the contact surface 11a ′ in the radial direction and reaching the rotation center O,
X1: intersection with the perpendicular from G1 to line OY X2: intersection with perpendicular from G1 to line OX X3: intersection between line G1-X2 and line OY
In addition, since the turning axis core line HS in three-dimensional coordinates is obtained as described above, the coordinates of the point G1 with respect to the axis center line O are also obtained. As shown by the equation (1) in FIG. 10, O and X2 The distance between them is T1, and the distance between X2 and G1 is T2 as shown in equation (2).
In the equation of FIG. 10, two symbols are shown with a mark “·” interposed between them and a line is further drawn on the upper side to represent the distance between the two symbols.
What is calculated is the distance L001 between X1 and G1 shown in equation (3).
Therefore, the distance between X2 and X3 is T1 × tan θ001, as shown in Expression (4).
From this, the distance between X3 and G1 is the distance obtained by subtracting the distance between X2 and X3 from the distance between X2 and G1, as shown in Expression (5), that is, T2−T1 × tan θ001 shown in Expression (6). It becomes.
Further, as shown in the equation (7), the angles X3, G1, and X1 are equal to the angles X3, O, and X2, and the value is θ001 as shown in (8).
Therefore, in the triangles G1, X1, and X3, the value of cos θ001 is obtained by dividing L001 by the distance between X3 and G1, as shown in Expression (9).
Multiplying both sides by the distance between X3 and G1 in equation (9) yields equation (10), and substituting the right side of equation (5) for the distance between X3 and G1 in equation (10) yields equation (11) and Become.
In this equation (11), the values of L001 can be obtained by substituting T1, T2 and the rotation angle value θ001, respectively.

The controller 10 obtains each distance as follows in addition to the above L001 in the stage shown in FIG. 8, for example, at the stage shown in FIG. Note that points where the turning axis HS intersects the second cross section A2, the third cross section A3, the fourth cross section A4, the fifth cross section A5, and the sixth cross section A6 are G2, G3, G4, G5, and G6, respectively.
That is, as described above, in each cross section between adjacent rotating arms, the rotation angles obtained by both rotating arms are compared with each other, and the smaller value is stored.
In the second cross section A2, a perpendicular distance L002 from G2 to the contact surface 11a ′ whose rotation angle is smaller than that of the contact surface 11b ′.
In the third cross section A3, a perpendicular distance L003 from G3 to the contact surface 11′b whose rotation angle is smaller than that of the contact surface 11c ′,
In the fourth cross section A4, a perpendicular distance L004 from G4 to the contact surface 11′d whose rotation angle is smaller than that of the contact surface 11c ′.
In the fifth cross section A5, a perpendicular distance L005 from G5 to the contact surface 11′d whose rotation angle is smaller than that of the contact surface 11′e,
In the sixth cross section A6, the distance L006 of the perpendicular to the contact surface 11′e is obtained from G6.

Next, from the state shown in FIG. 8, when the log W is first rotated by the predetermined angle by the spindles 3 and 3a, the positional relationship of the rotating arms 10a, 10b, 10c, 10d and 10e with respect to the log W is shown in FIG. When it is in the state, each distance is obtained as follows, and these values are stored. In this state, the points where the turning axis HS intersects the first cross section A1, the second cross section A2, the third cross section A3, the fourth cross section A4, the fifth cross section A5, and the sixth cross section A6 are H1, H2, Let H3, H4, H5, H6.
That is, similarly to the above, in each cross section between adjacent rotating arms, the rotation angles obtained by both rotating arms are compared with each other, and the smaller value is stored.
In the first cross section A1, a perpendicular distance L011 from H1 to the contact surface 11a ′ is obtained.
In the second cross section A2, a perpendicular distance L012 from H2 to the contact surface 11b ′ whose rotation angle is smaller than that of the contact surface 11a ′,
In the third cross section A3, a perpendicular distance L013 from H3 to the contact surface 11′b whose rotation angle is smaller than that of the contact surface 11c ′.
In the fourth cross section A4, a perpendicular distance L014 from H4 to the contact surface 11′d whose rotation angle is smaller than that of the contact surface 11c ′,
In the fifth cross section A5, a perpendicular distance L015 from H5 to the contact surface 11′e whose rotation angle is smaller than that of the contact surface 11′d,
In the sixth cross section A6, the distance L016 of the perpendicular to the contact surface 11′e is obtained from H6, and each value is stored.
Thereafter, similarly, until the spindles 3 and 3a make one rotation, the controller 10 calculates each distance for each predetermined rotation angle and stores each value.
When receiving a signal indicating that the spindles 3 and 3a have made one rotation from the first angle detector 7, the controller 10 determines the maximum value of the stored perpendicular distances from the turning axis of the log W. And set.
On the other hand, each cylinder 17 is operated to retract the piston rod 17a, and the first rotating arm 10a, the second rotating arm 10b, the third rotating arm 10c, the fourth rotating arm 10d, and the fifth rotating arm. Each of 10e is returned to the initial position shown by the solid line in FIG.

Depending on the value of the turning axis line HS and the maximum turning radius of the raw wood obtained as described above, for example, as shown below, the stand of the veneer lace provided with the cutting tool is waited and the raw wood is supplied to the veneer lace. To do.
That is, the base is moved back and forth with respect to the second spindle so that the distance between the axis center line of the pair of spindles of the veneer (hereinafter referred to as the second spindle) and the blade is the value of the maximum turning radius. Let me stand by. In this case, considering the mechanical error, the interval may be set to a value slightly larger than the value of the maximum turning radius.
Next, the log is supplied between the second spindle of the veneer race so that the calculated turning axis line HS of the log and the axis center line of the second spindle coincide with each other by a holding and conveying body provided separately. Thereafter, the second spindle is moved toward the log and the log is sandwiched.
In this state, when the log is rotated by the second spindle so as to be cut by the blade, the log does not hit and damage the parts provided on the table, for example, the nose bar. In addition, since the cutting of the raw wood by the cutting tool is started in a short time after the raw wood rotation starts, the productivity is improved.
According to the above embodiment, the maximum turning radius of the raw wood around the turning axis of the raw wood can be set by a simple calculation, and the time required for this can be shortened.

Next, in the description using FIG. 7 and FIG. 8, the rotation of both contact surfaces in each of the cross sections A2, A3, A4, and A5 between the adjacent contact surfaces within the calculated rotation angle. The reason for comparing the angle and selecting and storing the smaller value has been described for the following reason.
For example, as an enlarged explanatory view of the main part of FIG. 8, only the raw wood W and the contact member are schematically shown in FIG. 12 in the state where the contact surface is in contact with the outer periphery of the raw wood W, and will be described below.
In addition, each code | symbol in FIG.
Wa: the most protruding portion of the raw wood that the contact surface 11c 'is in contact Wb: the protruding portion of the original wood that is in contact with the contact surface 11b' Wc: the protruding portion P1 of the original wood that is in contact with the contact surface 11d ' : Intersection of the surface parallel to the cross section A4 passing through the contact portion between Wa and the contact surface 11c 'and the turning axis HS P2: On the contact surface 11c' of the perpendicular drawn from P1 to the contact surface 11c ' Point P3: a contact point between the point P4: Wc and the contact surface 11d ′ of the perpendicular line drawn from the point G3 to the contact surface 11c ′ (exactly, a surface extending the contact surface 11c ′) The point P6 on the contact surface 11d ′ of the perpendicular drawn from the intersection P5: P4 to the contact surface 11d ′ from the plane parallel to the cross section A5 and the turning axis HS is from the contact surface 11d ′ (exact , The contact line 11c ′ (precisely the contact surface 1) from the point P7: G4 on the surface of the perpendicular drawn to the contact surface 11d ′) The point on the surface of the perpendicular drawn to the surface 1c ′ is extended.

As is apparent from FIG. 12, the contact surface 11c ′ that is furthest away from the shaft center line 3b in the log radial direction is 11c ′, and is closer to the right end in the shaft center line direction of the shaft center line 3b with respect to the contact surface 11c ′. It is assumed that there is a most prominent portion Wa. However, it is impossible to know from each second angle detector which portion of each abutment surface directly hits the outer periphery of the log in the axial center line direction of the axial center line 3b.
Therefore, it is necessary to determine at which location the respective rotation angles obtained by the second angle detectors provided on the respective rotation arms are values of the respective contact surfaces in the axial center line direction.
If each rotation angle is a value in the left cross section in the axial center line direction of FIG. 12, that is, a value obtained at the contact surface 11c ′ is a value of the cross section A3, and a value obtained at the contact surface 11d ′ is a value of the cross section A4. Will cause problems in the following cases.
That is, in the above-described setting, the turning axis core line HS inclined downward to the right is obtained by the controller 10 based on the information from the distance detectors 9a, 9b, and 9c as shown in FIG.
In this case, in the same manner as described above, the distance between the contact surface 11c ′ and the turning axis HS, that is, the length between G3-P3 in the cross section A3, and the length of G4-P7 in the cross section A4 are the same. It is the maximum value in the cross section.
However, as is apparent from FIG. 12, the length between P1 and P2 at the protruding portion Wa is greater than the length between G3 and P3 at the location where the contact surface 11c 'is in contact.

Therefore, if it is determined that the length between G3 and P3 is the maximum as a result of the calculation as described above, the veneer race rack is moved away from the second spindle in the same manner as described above. If the raw wood is chucked and the raw wood is rotated with the turning axis line HS as the rotation center, the protruding portion Wa hits the blade etc., causing problems such as damage to the veneer lace parts. End up.
That is, when the distance between the contact surface and the calculated turning axis line HS becomes wider as the distance from the cross-section determined as the location for obtaining the rotation angle of the corresponding contact surface increases, the protrusion protrudes into each cross-section of the raw wood W. As long as there is no portion Wa, if the raw wood is chucked with the turning axis HS as the center of rotation, the radius of the portion Wa protruding from the obtained radius becomes larger, causing the above problem.
Therefore, in FIG. 12, when the rotation angle is a value in the right cross section of the contact surface, if the calculated turning axis HS is downwardly lowered, the same problem occurs.
Therefore, as described in the above embodiment, in the cross section between the adjacent contact surfaces, the smaller value compared with the rotation angle is used as the value in the cross section.
In this way, in the case of the shape as shown in FIG. 12, the value of the contact surface 11c ′ whose rotation angle is smaller than that of the contact surface 11b ′ in the cross section A3 is the rotation angle of the contact surface 11d ′ in the cross section A4. The value of the contact surface 11c ′ having a small is used.
As a result, in the range shown in FIG. 12, the length between G3 and P3 and the length between G4 and P7 are obtained from the rotation angle, and the length between G4 and P7 having a large value becomes the maximum turning radius. .
Here, since the length between G4 and P7 is longer than the length between P1 and P2, the value obtained as the maximum turning radius becomes large, and the position where the stand is waited is unnecessarily separated from the second spindle due to the value. However, it takes time to actually start cutting, but since the difference in length is small, there is no practical problem.

Next, a modified example will be described.
1. In the embodiment, in FIG. 7, the positions of the cross sections A1, A2, A3, A4, A5, and A6 are set as described above, but the approximate center of each rotating arm in the axial centerline 3b direction is set as a cross section. Also good.
That is, in the case of the third rotating arm 10c in FIG. 12, for example, D3 is set to the substantially central cross section. At this time, the intersection of the cross section D3 and the turning axis HS is P8, and the point on the contact surface 11c ′ of the perpendicular drawn from P8 to the contact surface 11c ′ is P9.
Even when the cross section is set as described above, the distance between P8 and P9 is obtained by substituting the obtained rotation angle into equation (11) in FIG. However, as is clear from FIG. 12, the point P8 is a point different from G3 and G4 on the turning axis HS obtained by the three-dimensional coordinates. Therefore, the values of T1 and T2 in the equation (11) are respectively set. It must be recalculated and assigned.
Although the distance between P8 and P9 obtained in this way is shorter than the distance between P1 and P2, there is an advantage that the error is smaller than when the distance between G3 and P3 is used as a radius. In FIG. 12, the error is reduced even when the obtained turning axis HS is descending to the left.
On the other hand, for such an error, the stand is put on standby at a position where the distance between the axis center line of the second spindle of the veneer and the blade is slightly larger than the calculated maximum turning radius. Just keep it.

2. When the shape of the raw wood is close to a cylinder, there is no practical problem even with the following calculation.
That is, the angle of rotation among the first rotation arm 10a, the second rotation arm 10b, the third rotation arm 10c, the fourth rotation arm 10d, and the fifth rotation arm 10e for each predetermined rotation angle is the largest. Only a small rotating arm may be calculated by calculating the distance from intersecting the turning axis to be perpendicular to the rotating arm, and the largest of the calculated distances may be set as the maximum turning radius. Then, the calculation time can be shortened.
3. In the embodiment, the first rotation arm 10a, the second rotation arm 10b, the third rotation arm 10c, the fourth rotation arm 10d, and the fifth rotation arm 10e have the same width in the axial centerline 3b direction. However, the width of the abutting member positioned at both ends in the direction may be reduced. Then, although explanation is omitted, the accuracy of the value of the maximum turning radius to be obtained becomes better.
4. In the embodiment, after the log W is held between the pair of first spindles 3 and 3a, the first rotating arm 10a, the second rotating arm 10b, the third rotating arm 10c, the fourth rotating arm 10d, Although the fifth rotating arm 10e is in contact with the log W, it may be contacted before being sandwiched, or may be simultaneous.
5. In the embodiment, the first spindles 3 and 3a perform the distance detection by the distance detectors 9a, 9b, and 9c and the rotation angles by the contact surfaces 11a ′, 11b ′, 11c ′, 11d ′, and 11e. Although it was performed at the same time for each angle rotation, each may be detected each time the image rotates by a predetermined angle different from each other.

It is a schematic side view of an Example. FIG. 2 is a view of an arrow direction taken along a two-dot chain line AA in FIG. FIG. 2 is a view of an arrow direction from a two-dot chain line BB in FIG. It is operation | movement explanatory drawing of an Example. It is operation | movement explanatory drawing of an Example. It is operation | movement explanatory drawing of an Example. FIG. 7 is a partial explanatory view when viewed from the outside in the direction of the arrow from the two-dotted line DD in FIG. In FIG. 7, it is the figure which added the calculated | required turning axis line HS. It is explanatory drawing in the case of calculating | requiring the distance between the turning axis line HS and contact surface 11a '. It is explanatory drawing and a calculation formula of the principal part for calculating | requiring the length L001 of a perpendicular line. FIG. 8 is a view corresponding to FIG. 7 when the log W is first rotated by the predetermined angle. FIG. 9 is an enlarged explanatory view of a main part of FIG. 8.

Explanation of symbols

3 .... first spindle
9a, 9b, 9c ... Distance detector
10a, 10b, 10c, 10d, 10e ... 1st rotation arm
11a ', 11b', 11c ', 11d', 11e '... contact surfaces 19a, 19b, 19c, 19d, 19e ... second angle detector

Claims (12)

Rotate the log at least once around the temporary axis to measure the outline of the log, and based on the measured outline information, determine the turning axis suitable for turning the log and the maximum turning radius corresponding to the turning axis. A method of detecting a turning axis of a raw wood to be calculated and a maximum turning radius,
The turning shaft core calculates each distance from the temporary shaft core to the outer circumference of the log at a plurality of positions set at intervals in a direction parallel to the temporary shaft core at every predetermined rotation angle of the temporary shaft core. , Calculating the turning axis of the raw wood,
The maximum turning radius has one end rotatably connected to an axis having an axis center line parallel to the temporary axis, and is provided at each other end of a plurality of rotating arms arranged in the axis center line direction. Further, a flat contact surface parallel to the axial center line is brought into contact with the outer periphery of the rotating log,
For each predetermined rotation angle of the temporary axis, the angle formed by the abutment surface of each rotating arm that rotates following the outer circumference of the log is detected with respect to a line connecting the temporary axis and the axis center line. After the turning axis is obtained, the lengths of the perpendiculars from the selected locations on the turning axis to the respective contact surfaces are obtained according to the stored angles, respectively. The maximum value of the length of the vertical line is the maximum turning radius. Turning axis
For each predetermined rotation angle of the temporary axis, the distances from the temporary axis to the outer periphery of the log at a plurality of positions set at intervals in a direction parallel to the temporary axis, Calculate the contour information and obtain the maximum inscribed circle in each cross-sectional contour, assume the direction of the maximum right circular cylinder that can be taken in each maximum inscribed circle of the plurality of locations, and the straight line passing through the center of the maximum right circular cylinder A method for detecting a turning axis of a raw wood and a maximum turning radius according to claim 1. Turning axis
For each rotation angle of the temporary shaft core, the distances from the temporary shaft core to the outer periphery of the log are determined at a plurality of positions set at intervals in a direction parallel to the temporary shaft core. The contour information is calculated and the maximum inscribed circle in each cross-sectional contour is obtained, the direction of the maximum right circular cylinder that can be taken in each maximum inscribed circle at the plurality of locations is predicted, the center line of the maximum right circular cylinder and the initial line Determine the axis direction,
Converting the plurality of cross-sectional contour information detected based on the temporary axis to new cross-sectional contour information in which the center line is a common axis;
By superimposing these converted new cross-sectional contour information on the base of the center line to obtain the cross-sectional contour information that falls inside these, obtain the maximum inscribed circle again based on this cross-sectional contour information,
The method of detecting a turning axis of a raw wood and a maximum turning radius according to claim 1, wherein the straight line is obtained by changing the center line to the center of the maximum inscribed circle. When the maximum turning radius is obtained, the selected location on the turning axis is a cross section passing through both ends of each contact surface in the axial center line direction and orthogonal to the temporary axis, and the turning axis The method of detecting a turning axis of a raw wood and a maximum turning radius according to claim 1, wherein the crossing points of the raw wood are defined as crossing points. When the maximum turning radius is obtained, the selected location on the turning axis is a cross section passing through the center of each contact surface in the axial center line direction and orthogonal to the temporary axis, and the turning axis. The method of detecting a turning axis of a raw wood and a maximum turning radius according to claim 1, wherein the intersecting points are used as intersections. For each predetermined rotation angle of the temporary axis, the angle formed by the abutment surface of each rotating arm that rotates following the outer circumference of the log is detected with respect to a line connecting the temporary axis and the axis center line. When remembering
The angle detected for each predetermined rotation angle and for each contact surface is in the axial centerline direction of the temporary shaft core, and the contact surfaces located at both ends are outside in the axial centerline direction of both contact surfaces. Store as values at each cross section perpendicular to the temporary axis through each end,
In each of the contact surfaces other than these, the angle detected between the two contact surfaces adjacent in the axial center line direction is compared with each other, and only a large angle value is obtained between the two contact surfaces. Store it as a value in a cross section orthogonal to the temporary axis of the street,
After the turning axis is obtained, the lengths of the perpendiculars from the respective intersections between the cross-sections and the turning axis to the corresponding contact surfaces are obtained from the stored angles, and the obtained perpendiculars are obtained. 2. A method of detecting a turning axis of a raw wood and a maximum turning radius according to claim 1, wherein the maximum value of the length is a maximum turning radius. A pair of clamping members each having an axial center line on the first straight line, capable of moving forward and backward in the direction of the axial center line, and rotatable;
A sandwiching member moving member that moves the pair of sandwiching members toward or away from each other;
A rotating member that rotates at least one of the pair of clamping members;
A first angle detection member for detecting a rotation angle of the pair of clamping members;
A log supply member that supplies log between a pair of clamping members;
One end is rotatably connected to an axis having a second axis center line parallel to the first straight line, and the other end has a flat contact surface parallel to the second axis center line, and the second axis center line A number of rotating arms arranged in the direction;
The rotating arms are separated from each other so that each rotating arm is in contact with the separated position where the rotating arms do not hit the log supplied between the pair of holding members and the log held between the pair of holding members. A reciprocating rotation member that rotates between the contact position;
A second angle that is provided on each of the rotating arms and detects an angle formed by the abutment surface of each of the rotating arms that rotates along the outer circumference of the log with respect to a line connecting the first straight line and the second axis center line. A detection member;
A plurality of distance detectors which are provided at positions spaced apart in a direction parallel to the first straight line and separated from the first straight line by a predetermined distance, and detect the distance to the surface of the log sandwiched between the pair of sandwiching members;
In an initial state in which the gap between the pair of clamping members is set to a state larger than the length of the log by the holding member moving member, and each of the rotating arms is set to a standby position by the reciprocating rotary member,
First, the raw wood is supplied between the pair of clamping members by the raw wood supply member,
Next, the operation of the sandwiching member moving member sandwiches the log with a pair of sandwiching members,
Next, each revolving arm is rotated to a contact position by a reciprocating rotation member,
Next, the pair of clamping members are started to be rotated by the rotating member, and the distance to the log surface detected by each distance detector is stored, and the angle detected by each second angle detecting member is stored. Is performed each time the pair of clamping members rotate by a predetermined angle using the detection signal from the first angle detection member,
When the first angle detection member outputs a signal that detects that the pair of clamping members has made at least one rotation, the turning axis of the raw wood is calculated based on the distance information to the raw wood surface detected by each distance detector. Then, each of the stored angles is used to determine the length of the perpendicular from the selected location on the turning axis to each abutment surface, and the maximum value of the obtained perpendicular length is maximized. A raw wood turning shaft core and a maximum turning radius detection device each having a controller for outputting as a turning radius. Based on the information on the distance to the surface of the log of the turning shaft detected by each distance detector, the cross-section contour information of the log at a plurality of locations corresponding to each distance detector is calculated, and the maximum in each cross-section contour is calculated. 8. The raw wood according to claim 7, which is a controller that obtains a tangent circle, assumes a direction of a maximum right circular cylinder that can be taken in each maximum inscribed circle of the plurality of locations, and makes a straight line passing through the center of the maximum right circular cylinder Turning axis and maximum turning radius detector. Based on the information on the distance to the surface of the log of the turning shaft detected by each distance detector, the cross-section contour information of the log at a plurality of locations corresponding to each distance detector is calculated, and the maximum in each cross-section contour is calculated. Find the tangent circle, predict the direction of the largest right circular cylinder that can be taken within each maximum inscribed circle of the plurality of locations, determine the center line of this largest right circular cylinder and the desired axial direction,
Converting the plurality of cross-sectional contour information detected based on the temporary axis to new cross-sectional contour information in which the center line is a common axis;
By superimposing these converted new cross-sectional contour information on the base of the center line to obtain the cross-sectional contour information that falls inside these, obtain the maximum inscribed circle again based on this cross-sectional contour information,
8. The raw wood turning shaft core and maximum turning radius detecting device according to claim 7, wherein the turning center of the raw wood is a controller that changes the center line to the center of the maximum inscribed circle. When the maximum turning radius is obtained, the selected part on the turning axis is crossed through both ends of each contact surface in the axial center line direction and perpendicular to the temporary axis, and the turning axis is The raw wood turning shaft core and the maximum turning radius detection device according to claim 7, wherein the crossing points are places where they intersect. When the maximum turning radius is obtained, the selected location on the turning axis is a cross section passing through the center of each contact surface in the axial center line direction and orthogonal to the temporary axis, and the turning axis. The raw wood turning shaft core and the maximum turning radius detection device according to claim 7, wherein the crossing points are places where they intersect. A pair of clamping members each having an axial center line on the first straight line, capable of moving forward and backward in the direction of the axial center line, and rotatable;
A rotating member that rotates at least one of the pair of clamping members;
A distance detection member that detects a distance from the two or more locations on a straight line parallel to the axial center line to the outer periphery of the raw wood in a direction orthogonal to the straight line, the raw wood sandwiched between the pair of clamping members;
A plurality of rotating arms arranged in parallel in the direction of the rotation axis, which are rotatable on a rotation axis parallel to the first straight line and a flat plate parallel to the axial center line of the pair of clamping members;
An angle detection member for detecting an angle at which each of the plurality of rotating arms is rotated from a predetermined position;
The plurality of rotating arms are arranged in the axial center line direction as a first rotating arm, a second rotating arm, a third rotating arm,... (N-2) rotating arm, (N-1) th rotation. A moving arm and Nth turning arm
Also, with a plurality of virtual sections perpendicular to the axis center line,
A first cross section of the second rotating arm side in the axial center line direction of the first rotating arm,
A second cross section between the first rotating arm and the second rotating arm;
The section between the second and third rotating arms is a third cross section, and so on.
The (N-1) th section between the (N-2) th rotating arm and the (N-1) th rotating arm,
An Nth cross section between the (N-1) th rotating arm and the Nth rotating arm,
The anti- (N-1) th rotation arm side in the axial center line direction of the Nth rotation arm is the (N + 1) th section,
Next, until the pair of clamping members are rotated by the rotating member, the pair of clamping members are advanced in a direction approaching each other to clamp the log in the fiber direction, and each of the plurality of rotating arms is contacted with the log. Let them touch,
Next, a pair of holding members holding the raw wood is rotated at least once by the rotating member, and the turning axis of the raw wood is based on the total data of the distance detected by the distance detecting member at every predetermined rotation angle of the one rotation. Is calculated and stored, and within the angle detected by the angle detection member at each predetermined rotation angle,
In the first section, the turning angle of the first turning arm is stored,
In the second cross section, the rotation angle of the rotation arm that has been rotated a lot in the direction away from the axis center line between the first rotation arm and the second rotation arm is stored,
In the third cross section, the rotation angle of the rotation arm that has been rotated a lot in the direction away from the axis center line between the second rotation arm and the third rotation arm is stored.
In the (N-1) th section, the turning angle of the turning arm that is turned a lot in the direction away from the axial center line between the (N-2) turning arm and the (N-1) turning arm is stored. And
In the Nth cross section, the turning angle of the turning arm that has been turned a lot in the direction away from the axial center line between the (N-1) th turning arm and the Nth turning arm is stored,
In the (N + 1) th section, the turning angle of the Nth turning arm is stored,
Next, for each of the predetermined rotation angles, the respective distances from the position where the turning axis rotated in the same manner as each of the predetermined rotation angles and the crossing of each cross section to each of the rotating arms having the stored angles are perpendicular to each other. Calculate and store,
Next, a controller that outputs the information about the turning axis of the raw wood and the maximum turning radius to the next step, setting the maximum distance among the stored distances as the maximum turning radius from the turning axis of the raw wood, A raw wood turning shaft core and a maximum turning radius detection device.

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