JP4594643B2 - Raw wood centering processing method and raw wood centering processing apparatus - Google Patents

Description

  The present invention relates to a raw wood centering processing method and a raw wood centering processing apparatus.

  When turning a log using veneer lace, it is necessary to accurately determine the position of the turning shaft core in order to improve the yield of continuous veneer and improve the veneer yield. As a means for determining, the log is rotated around a temporary axis, preferably at least the contours near both ends of the log, more preferably the contours near the central part of the log, and a length of 2 m. If necessary, measure the contour of the middle part (one place each on the left and right) between both ends of the log and the center of the log. The means for calculating the desired turning axis based on the relative positional relationship, etc.) is considered to be effective and practical.

  Furthermore, in order to reduce the log rotation time while avoiding the collision between the log and the stand, it is necessary to obtain the maximum turning radius of the log and make the stand stand in a suitable position in advance each time. When determining the position of the turning axis, it is convenient if the maximum turning radius of the raw wood is also obtained, but the maximum turning radius of the raw wood has a subordinate correlation that cannot be obtained unless the turning axis is determined. In addition, it is important to note that insufficient measurement of the contour is not allowed because there is an inconvenience of collision between the log and the base if there is insufficient measurement of the contour in the axial direction of the log (measurement blank area). is there.

  More specifically, as illustrated in FIGS. 6A and 6B, when the target is a log A having the same outline (both having a diameter = D and having a recess A2 in a part of the outer periphery). For example, if the turning axis is defined at the position indicated by reference symbol a in FIG. 6 (a), the largest continuous single plate can be obtained from the portion indicated by reference symbol A3, but from the portion indicated by reference symbol A4. Since many single veneers with a narrow width (width in the direction perpendicular to the fiber) that are not suitable for use are cut, the single plate yield is lowered, whereas turning is performed at the position indicated by the symbol b in FIG. When the axis is defined, the amount of the continuous single plate obtained from the portion indicated by reference numeral A5 is smaller than that of the example of (A), but from the portion indicated by reference symbol A6, there are many single plates having a narrow width. Since it is not cut, the single plate yield will be improved compared to the example in (a), or the illustration is omitted. However, if the turning axis is determined at the middle position between the two examples, the yield of single veneer and the single plate yield will be in the middle of the two examples. Depending on the position of the turning axis, the properties of the single plate to be machined differ.

  Therefore, it is desirable to calculate the position of the turning axis based on the measured size of each contour and the relative positional relationship so as to correspond to the desired properties of the single plate. Although the method of determining the turning axis at the position where the most continuous single plate can be obtained as in the example of (a) is often used, the turning axis is determined at the position of the example of FIG. A method and a method for determining a turning axis at an intermediate position between the two examples have also been put into practical use, and even if the log has the same contour, the preferred turning axis position is not always constant. .

  Thus, in the example of FIG. 6, for example, if the turning axis is determined at the position of the example (b), in this case, the maximum turning radius of the raw wood = D / 2. On the other hand, if the turning axis is determined at the position of the example in (a), the maximum turning radius of the raw wood is not determined by the maximum turning radius of the raw wood, as is clear from the fact that the maximum turning radius of the raw wood is greater than D / 2. It has a subordinate correlation that cannot be obtained without it.

  On the other hand, for example, in calculating the turning axis of the log B as illustrated in FIG. 7, the log B is rotated around a temporary axis (c) (temporarily determined axis) c, and two near the both ends of the log B are obtained. If the contour of the log B is measured with appropriate measuring devices C1 and C2 provided at the location, the minimum necessary condition can be satisfied, and it has been proposed and implemented in practice. Depending on the measurement mode of the contour, it is impossible to measure the contour of the convex portion B1 such as a branch or aneurysm between the measuring devices C1 and C2, and therefore it is impossible to obtain the maximum turning radius of the log B together. Yes, if the stand is made to stand by at a position corresponding to the measurement of the measuring devices C1 and C2, there will be an inconvenience that the projection B1 and the stand collide. In other words, in order to obtain the maximum turning radius of the raw wood, insufficient measurement of the contour in the axial direction of the raw wood is not allowed. In fact, in order to avoid the inconvenience, in reality, measures have been taken to reverse the stand and make it stand by each time. Yes.

  In addition, in the case of the measurement mode, it is not possible to measure the contour of the concave portion together with the contour of the convex portion between the measuring devices, but if the calculation is limited to only the maximum turning radius, the contour data of the concave portion is It is useless at all, and no particular problem occurs. In other words, even if there is a recess in any part of the raw wood, the recess cannot collide with the veneer rack, so even if the contour data of the recess cannot be measured, the maximum turning radius is calculated. There is no problem at all, and even if the contour data of the recesses in any part of the raw wood is not obtained, there is no problem in calculating only the maximum turning radius. It can be said that this is a limited exception common to all types of measurement modes including the case of the centering processing method and the raw wood centering processing apparatus. However, in any case, for the calculation of the turning axis suitable for the turning of the raw wood, there is no change that the measurement of appropriate contour data including the concave portion is desired.

Therefore, the raw wood centering method, which enables calculation of the turning axis suitable for turning of the raw wood and the maximum turning radius, has already been "the raw wood centering method, the centering supply method and their devices" (Japanese Patent Laid-Open No. Hei 6-293002), specifically, “providing a plurality of contour detectors in close contact with the longitudinal direction of the raw wood that is rotated once around the temporary axis, Based on the contour data of two or more of the contour detectors, the turning axis suitable for turning the raw wood is calculated, and the previously calculated turning shaft based on all the contour data of the plurality of contour detectors This is a method of centering processing of a raw wood that adopts the configuration of “determining the maximum turning radius of the raw wood relative to the core”.
JP-A-6-293002

  However, the raw wood centering processing method disclosed in the publication is based on the contour data of a plurality of common contour detectors, and calculates a turning axis suitable for turning the raw wood and a maximum turning radius. Since all of the disclosed contour detectors have defects and disadvantages, they have drawbacks such as inferior accuracy of the contour data obtained, and are extremely impractical. .

  That is, for example, the outline of the configuration of the contact-type contour detector, which is one of the examples of the contour detector disclosed in the above publication, is as follows. As illustrated in FIG. 51, and a plurality of contact oscillating detection members 50 whose base end side is pivotably supported via a support shaft 52, and the detection tool 51 is in close contact with the axis direction of the log E. The linear encoder 53 detects the amount of rocking of each of the detection members 50, and the appropriate angle of the log E (360 degrees is divided into 36 equal parts for the sake of convenience. This is a configuration for obtaining contour data as a set of points.

  According to the above configuration, because of the shape characteristics of the detection tool, the cylindrical detection tool 51 does not swing exactly following the convex part E1 and the concave part E2 of the log E. Since the result shown in FIG. 8 (b) is indicated by a solid line f and is different from the actual contour indicated by the dotted line g, it is possible to obtain the most appropriate turning axis desired from such contour data. Can not. By the way, when the shape of the detection tool is changed to a shape that enters the bottom of the recess, the detection tool gets caught in the recess or projection, and the log cannot be rotated smoothly, and the detection itself is disabled. It will be. ,

  Further, the outline of the configuration of the projector / receiver combined type contour detector, which is another example of the contour detector disclosed in the above-mentioned publication, is an appropriate number as shown in FIG. The light projector 54 and the light receiver 55 are provided in parallel to the axial direction of the log F, and the light receiver 55 detects the shielding of the light beam h by the log F. The contour data is obtained as a set of points (every 10 degrees), but in this configuration as well, the contour data obtained from the characteristics of light rays is as shown by the solid line f in FIG. Thus, since the result is different from the actual contour indicated by the dotted line g (the convex portion F1 and the concave portion F2 exist), the most appropriate turning axis desired cannot be obtained.

  On the other hand, the outline of the configuration of the reflection type contour detector which is another example of the contour detector disclosed in the above publication is as shown in FIG. Since the detectors 56 are arranged side by side so that the detection directions of the contour detectors 56 are directed to the centripetal direction of the log G, the contour detectors 56 are exactly located at the locations of the light rays h that are projected and received. Only when the convex part G1 or the concave part (not shown) is conveniently located, accurate contour data of the log G can be obtained, but even if the contour detectors 56 are arranged without gaps as shown in FIG. Since it is unavoidable that a detection blank area is generated, a problem of local detection omission is caused in the same manner as described in the example of FIG. 7, and an appropriate maximum turning radius cannot be obtained. Incidentally, even if we dare mention, even if it is assumed that the fixed points detected by the reflection type contour detector can be arranged in the axial direction of the raw wood with substantially no gap by any method, In some cases, the absolute number of contour data obtained is extremely large, resulting in another problem that the data processing is prolonged, resulting in a lack of practicality, such as deteriorating the operating rate of the veneer race. Become.

  Furthermore, in the above publication, as shown in FIG. 11, an appropriate number of reflection type contour detectors 56 are arranged in parallel so that the detection direction of each contour detector 56 faces the centripetal direction of the log H. In addition, a light projector 54 and a light receiver 55 are provided facing each other in the direction of the axis of the log H. Based on the contour data of the contour detector 56, the turning axis d of the log H is also received by the light receiver. Although the structure which calculates | requires each maximum turning radius of the log H based on the contour data of 55 is also disclosed, even if such a structure is taken, for example, the provisional axis c and the appropriate turning axis d are provided. If the convex portion H1 is hidden behind the light beam h due to factors such as being different, it cannot be detected, so that there is still a problem that an appropriate maximum turning radius cannot be obtained.

  The present invention has been developed to eliminate the disadvantages and difficulties of the prior art. Specifically, the raw wood is rotated around a temporary axis, and the contour of the raw wood is defined for each desired rotation angle. A raw wood centering processing method that calculates a turning axis suitable for turning of a raw wood and a maximum turning radius corresponding to the turning axial based on the measured contour data. The contour used for calculation and the contour used for calculating the maximum turning radius are separately measured, and the contour used for calculating the turning shaft center is measured at a plurality of desired intervals with appropriate intervals in the axial direction of the raw wood. Contour measurement is limited to a point, and the contour used to calculate the maximum turning radius is measured in a wide area for each desired measurement area divided almost without gaps in the axial direction of the log. A method for centering a log of raw wood (claim 1); 2. The raw wood centering method according to claim 1, wherein the contour used for calculating the turning axis is measured at at least two measurement points near both ends of the raw wood, and the central portion of the raw wood The raw wood centering method (claim) 3 according to claim 2, wherein a contour used for calculation of a turning shaft center is measured at one nearby measurement point.

  Further, as an apparatus used for carrying out the method, left and right provided to be laterally movable toward and away from both end surfaces of the raw wood supplied to a predetermined temporary core location, and at least one side is rotationally driven. A pair of temporary rotation shafts, a rotation angle detector for detecting the rotation angle of the temporary rotation shafts, and the vicinity of the outer periphery of the raw wood supplied to the temporary core location, and at appropriate intervals in the axial direction of the raw wood Reflective distance detectors that are provided with desired detection directions facing the log centering direction, and a plurality of base end sides that are divided into the desired plurality with respect to the axis direction of the log. The detectors that are pivotally supported by the support shafts located in the vicinity of the outer periphery of the raw wood that is supplied to the temporary core location, and the detectors attached to the respective distal ends are lined up substantially in the axial direction of the raw wood. Contact swing type detection member provided to come into contact with the outer circumference of the log and each detection unit Based on a plurality of swing angle detectors that individually detect the swing amount of the rotation angle, the detection signal of the rotation angle detector and the contour data of the distance detector, and calculating a turning axis suitable for turning the raw wood, and A raw wood centering processing device (Claim 4), further comprising a centering calculation mechanism for calculating a maximum turning radius corresponding to the turning shaft core by further adding contour data of the swing angle detector; 5. A raw wood centering apparatus (Claim 5) comprising reflection type distance detectors at least at two locations near both ends of the raw wood, and at one location near the central portion of the raw wood. 6. A raw wood centering apparatus (Claim 6) comprising a reflection type distance detector, and a detection member provided with a flat plate detector. Alternatively, the raw wood centering processing device according to claim 6 (claim 7) and the cylindrical inspection We propose a centering apparatus of wood fixings consisting comprises a detecting member which is attached to claim 4 or claim 5 or claim 6 wherein (claim 8).

  According to the raw wood centering processing method according to the present invention, the contour used for the calculation of the turning axis is limited to a plurality of desired measurement points spaced at appropriate intervals in the direction of the axial center of the raw wood. In addition, the contour used for calculating the maximum turning radius is measured in a wide area for each of a plurality of desired measurement areas divided almost without gaps in the axial direction of the raw wood. The contour data used for the calculation of the turning axis results in a different result from the actual contour, or the contour of the convex part of the raw wood leaks out of the contour data used for the calculation of the maximum turning radius. There is no possibility that it will occur, and as a whole, a more effective centering process can be performed as compared with the prior art. Further, the raw wood centering processing apparatus according to the present invention can carry out the raw wood centering processing method according to the present invention without any trouble, and the type including a detection member provided with a flat plate-like detection tool on the tip side is provided. This has the effect that the rotation of the log can be performed very smoothly.

  Hereinafter, the present invention will be described in further detail together with an example of the embodiment illustrated in the drawings. For the sake of clarity, the same members / materials as those already cited in the description of the prior art, or similar members. -Even if it is a material, it attaches another code | symbol and demonstrates anew.

  FIG. 1 is a front explanatory view of a raw wood centering processing apparatus used for carrying out the raw wood centering processing method according to the present invention, and FIG. 2 is a partial front view of the raw wood centering processing apparatus illustrated in FIG. FIG. 3 is a partial side view of the raw wood centering processing apparatus illustrated in FIG. 1, and FIG. 4 is an overview of control system relationships in the raw wood centering processing apparatus illustrated in FIG. It is explanatory drawing.

  In the figure, reference numeral 1 denotes a pair of left and right temporary rotating shafts rotatably supported via bearing boxes 2 and 2a attached to a machine frame or the like (not shown), and an operating mechanism 3 comprising a fluid cylinder or the like. As shown by the arrows in the figure, the drive source 4 consisting of a servo motor, an electric motor with a speed reducer, etc. can be obtained so that they can move toward and away from each other. A V-block-shaped log supply tool 7 is provided so as to be driven to rotate as indicated by an arrow in the figure via a transmission member 5 comprising a toothed belt, chain, etc. The raw wood M supplied to the temporary core place is sandwiched from both the left and right sides and rotated in the direction indicated by the arrows in the drawing. As will be described later, the bearing box may be provided so that it can be moved in the horizontal and vertical directions separately to the left and right to accommodate the type of the log transport mechanism, as required.

  Reference numeral 6 denotes a rotation angle detector composed of a rotary encoder or the like attached to the drive source 4. The rotation angle detector 6 detects the rotation angle of the temporary rotating shaft 1 and transmits a detection signal to a centering calculation mechanism 21 described later.

  8 is attached to the support frame 10 via the support arm 9 so that the detection direction is positioned in the log centering direction at three locations, two locations near both ends of the log M and one location near the center. A reflection-type distance detector provided to measure the contours at three measurement points on the log M rotated through the temporary rotation shaft 1 at a fixed point, and to a centering calculation mechanism 21 described later. The contour data used for calculating the turning axis of the log M is transmitted.

  Reference numeral 11 denotes a contact swing type detection member that is divided into a plurality (in the embodiment, five) with respect to the axial direction of the log M, and each base end side of the support member is fixed to the support frame 10. 12 and a plate-like detector 14 pivotally supported via a support shaft 13 that is rotatably fitted to the support 12 and attached to the tip of each of them is a log M. Are arranged so as to be in contact with the outer circumference of the log, with almost no gap therebetween. For the convenience of clarifying the swinging, the detection member 11 is raised in FIG. 1, and the detection member 11 is lowered in FIGS. Respectively.

  Reference numeral 15 denotes a plurality (five in the embodiment) of swing angle detectors, each composed of a rotary encoder attached to each of the supports 12, and the swing of each of the detection members 11 via each support shaft 13. The amount of movement is detected (the rocking angle and the rocking amount of the detection member 11 are functionally related, and if the rocking angle is determined, the rocking amount is also determined), and the maximum turning radius of the log M is sent to the centering calculation mechanism 21 described later. Contour data used to calculate

  Reference numeral 16 denotes an elevating mechanism composed of a fluid cylinder or the like. The elevating mechanism 16 pivots through a holding tool 17 fixed to the support frame 10 and a holding shaft 18 rotatably fitted to the holding tool 17. In addition to being supported and connected to each of the detection members 11 via a connecting tool 19, a connecting pin 20, etc., for example, when supplying the raw wood M to a temporary core place, by manual operation or as required Each detection member 11 is automatically swung upward (raised) via a control mechanism or the like. Further, if necessary, it is also possible to have a function of forcibly pressing each detection member 11 (detection tool 14) against the log M individually.

  Reference numeral 21 denotes a centering calculation mechanism which is also provided with a contour storage mechanism as necessary, and includes a detection signal from the rotation angle detector 6 and contour data from the distance detectors 8. Based on this, a turning axis suitable for turning the log M is calculated, and the contour data of the swing angle detector 15 is further added to calculate the maximum turning radius corresponding to the turning axis. Then, the calculated data of the turning axis and the maximum turning radius are transmitted to the control mechanism 22 that controls the operation of, for example, the known table moving mechanism 23 and the log transport mechanism 24 as usual.

  The raw wood centering processing method according to the present invention is carried out, for example, using the raw wood centering processing apparatus configured as described above, and the raw wood M supplied to the temporary core location via the raw wood supply tool 7. Is rotated from the left and right sides via the temporary rotation shaft 1 and then rotated in the direction indicated by the arrow through the drive source 4, the rotation angle detector 6 causes the rotation angle of the temporary rotation shaft 1 (that is, Rotation angle) and the distance detector 8 measures the contour of the log M, so that it is possible to obtain the log data of the log M at three convenient measurement points, and in addition, each swing angle. Since the detector 15 measures the contour of the log M through each of the detection members 11, the contour data over the entire area of the log M in the axial direction can also be obtained.

  Thus, at the three measurement points, the position of each measurement point is not affected by the shape of the log at all by directing the detection direction of the reflection type distance detector in the direction of the log of the log. In this way, it is possible to obtain the contour data that is faithful to the actual contour even if the convex or concave portion of the log passes through the position of the measuring point. Therefore, based on contour data faithful to the actual contour, it is possible to calculate a turning axis suitable for turning a raw wood more accurately than in the past. And furthermore, the measurement of the contour of the log by the rocking angle detector (and the detection member) is performed in a wide area collectively for each of a plurality of measurement areas, and extends over the entire area in the axial direction of the log. Even if there is a convex part in any part of the raw wood, there is no risk of detection leaking, and the maximum turning radius as required can be accurately calculated. Processing can be performed.

  Incidentally, to what extent the contour of the log is accurately measured can be arbitrarily adjusted by adjusting the detection rate (detection frequency) of the rotation angle of the log by the rotation angle detector. If the detection rate is set relatively fine, faithful contour data can be obtained with the actual contour, and conversely, if the detection rate is set relatively coarse, the probability of faithfully measuring the convex part or concave part of the raw wood is increased. It tends to decrease. Of course, if necessary, the detection ratio when measuring the contour data used for calculating the turning axis by the distance detector and the contour data used for calculating the maximum turning radius by the swing angle detector (and the detection member). There is no problem even if the measurement ratio when measuring is individually varied.

  There are no restrictions on the calculation method for calculating the turning axis suitable for turning raw wood and the maximum turning radius based on the obtained contour data, and there are no known methods used for this type of processing method. Any calculation method such as a calculation method or a calculation method using a conventionally known mathematical method may be used. Of course, when calculating the turning axis, it is not always necessary to include all of the measured contour data as the calculation data. For example, some special contour data such as the contour data of local protrusions is included. Of course, the calculation method can be excluded from the calculation materials if necessary (formally, it is once included in the calculation materials and excluded later if necessary). .

  Also, there are no particular restrictions on the format of the reflection type distance detector, and there are various known types such as a format using ultrasonic waves in addition to a general-purpose light source format using a light beam such as a laser beam as a light source. In addition, according to the conventional arrangement, at least two locations near both ends of the raw wood, preferably, at one location near the central portion of the raw wood, if necessary, In addition, it is sufficient to arrange them in the middle part between the both ends of the log and the center.

  As for the contact swing type detection member, as exemplified in the above-described embodiment, a form in which a flat plate-like detection tool is attached to the tip side is advantageous in that the raw wood can be rotated very smoothly. However, the present invention is not necessarily limited to this form. In addition, as in the example of FIG. 8 (a), a form in which a cylindrical detector is attached to the tip side, or illustration is omitted. However, any type that does not significantly impede the rotation of the raw wood, such as a type in which a half-cylindrical cylindrical detector is attached to the tip side, is sufficient. Furthermore, there are no particular restrictions on the number of sections. However, if the number of sections is too small, there is a risk that the contour data may have a value different from the actual contour due to torsion of the detection member. If there are too many sections, extra contour data will be obtained, and there is a risk that the data processing will be excessive more than necessary, so it is preferable to divide it into an appropriate number. It is a tentative guide to classify the length so that the hit length is slightly over one scale (approximately 33 cm).

  Furthermore, there is no particular limitation on the type of the log transport mechanism that transports the centered log from the centering processing device to the veneer lace, and this type of processing method has conventionally had various log transport mechanisms. However, if any of these known types is used, for example, as shown in FIG. 5, for example, a tip is placed between the centering device and the veneer lace 25. An appropriate number of gripping claws 31 are provided on the side, and the base end side is fitted to a fulcrum shaft 28 pivotally supported by a fulcrum bearing 27 so as to be slidable in the axial direction, and is composed of a fluid cylinder or the like. A pair of left and right transfer arms 30 that can be operated and separated from each other are obtained by the operation of the operation mechanism 29, and the operation of the drive source 32 including a servo motor, a motor with a speed reducer, and the like is obtained. As shown by the illustrated arrows N1 and N2, the system 30 is provided in the middle from the supply start position P connecting the center S1 of the fulcrum shaft 28 and the centering reference position (always constant position) S2 of the centering processing device. Through the supply standby position Q, it is configured to reciprocate integrally and alternately to a supply end position R connecting the center S1 of the fulcrum shaft 28 and the center S3 of the spindle 26 of the veneer race 25, and the appropriate operation There is a log transporting mechanism configured to move the temporary rotating shaft 1 of the centering processing device in the horizontal direction (X direction) and the vertical direction (Y direction) separately through the mechanism (not shown). .

  For example, when a log transport mechanism configured as described above is used, after the log M is centered by the processing method as described above, the provisional rotary shaft 1 is moved in the horizontal and vertical directions by the required amount separately for the left and right. Each of the transfer arms 30 that have been made to match the calculated position of the appropriate turning shaft core of the log M with the centering reference position S2 of the centering processing apparatus and further waiting at the supply standby position Q. While rotating integrally to the supply start position P via the drive source 32, each transfer arm 30 is mutually approached via the action mechanism 29, and the log M is gripped from both the left and right sides. Next, after the holding of the log M by the temporary rotating shaft 1 is released, the transfer arms 30 are integrally rotated to the supply end position R via the drive source 32 (if necessary, the supply arm 30 is moved to the supply standby position Q). After waiting once), the spindle 26 of the veneer race 25 is further operated to clamp the log M, and then the transfer arms 30 are separated from each other via the operating mechanism 29 to complete the transfer of the log M. be able to.

  Of course, the type of the log transport mechanism is not limited to that of such an example as described above. In addition to this, although not shown in the figure, for example, in the course of transferring the log, the log In the form of varying the position of the raw wood so that the position of the appropriate turning axis of the wood matches the desired reference position, or for example just before finishing the transportation of the raw wood, Various types of log transporting mechanisms known in the art can be used, such as a mode in which the feed position of the log is changed so as to match the position with the center of the spindle.

  According to the present invention, the centering process can be performed more effectively than the prior art, which is suitable for rationalizing the centering process.

It is front explanatory drawing of the centering processing apparatus of the raw wood used for implementation of the centering processing method of the raw wood which concerns on this invention. FIG. 2 is a partial front explanatory view of the raw wood centering apparatus illustrated in FIG. 1. FIG. 2 is a partial side view of the raw wood centering apparatus illustrated in FIG. 1. FIG. 2 is a schematic explanatory diagram of control system relationships in the raw wood centering processing apparatus illustrated in FIG. 1. It is side surface explanatory drawing of an example of the log transport mechanism with which the post process of the log centering apparatus concerning this invention is equipped. It is a schematic side view for demonstrating the example of the method of determining the turning axis of a raw wood. It is a schematic front explanatory drawing for demonstrating the conventional centering processing method. It is a schematic side view for demonstrating another conventional centering processing method. It is a schematic side view for demonstrating another conventional centering processing method. It is a schematic front explanatory drawing for demonstrating another conventional centering processing method. It is a schematic front explanatory drawing for demonstrating another conventional centering processing method.

Explanation of symbols

A, B, E, F, G, H, M: Log B1, E1, F1, G1, H1, M1: Logs A2, E2, F2, M2: Logs C1, C2 of logs: Conventional logs Measuring device D of centering processing device: Diameter of raw wood P: Raw wood supply start position Q: Raw wood supply standby position R: Raw wood supply end position a · b · d: Raw wood turning axis c: Raw wood temporary Shaft core 1: A pair of left and right temporary rotating shafts 3 and 29: Actuating mechanism 4 and 32: Drive source 6: Rotation angle detector 8: Reflection type distance detector 11 and 50: Contact swing type detection member 14: Flat plate -Shaped detector 15: rocking angle detector 21: centering calculation mechanism 25: veneer race 26: spindle 30: transfer arm 51: cylindrical detector 53: linear encoder 54: projector 55: light receiver 56: reflection type Contour detector

Claims (8)

  The log is rotated around the temporary axis and the outline of the log is measured at each desired rotation angle. Based on the measured outline data, the turning axis suitable for turning the log and the turning axis are supported. A raw wood centering method that calculates the maximum turning radius. The contour used to calculate the turning axis and the contour used to calculate the maximum turning radius are measured separately, and the turning axis is calculated. The contour used for the measurement is fixed-point measurement limited to a plurality of desired measurement points separated by appropriate intervals in the axial direction of the raw wood, and the contour used for calculating the maximum turning radius is in the axial direction of the raw wood. A raw wood centering method characterized in that measurement is performed over a wide area for each of a plurality of desired measurement areas divided almost without gaps.   2. The raw wood centering method according to claim 1, wherein the contour used for calculating the turning axis is measured at least at two measurement points near both ends of the raw wood.   3. The raw wood centering method according to claim 2, wherein the contour used for calculating the turning axis is measured at one measurement point near the center of the raw wood.   A pair of left and right temporary rotating shafts provided so as to be able to approach and separate from each other and to be driven to rotate at least on one side to both sides of the raw wood supplied to a predetermined temporary core location, and the temporary rotating shaft Rotation angle detector for detecting the rotation angle of the wood and detection to a plurality of desired locations in the vicinity of the outer periphery of the raw wood supplied to the temporary core location, with appropriate intervals in the axial direction of the raw wood Reflective distance detectors with the direction facing the centripetal direction of the log and the outer periphery of the log that is supplied to the temporary core location on the base end side divided into the desired multiple with respect to the axis direction of the log Contact detectors that are pivotally supported via a support shaft located in the vicinity of each other, and that are provided so that the detectors attached to the respective tip ends are arranged in the axial center direction of the raw wood so as to be in contact with the outer circumference of the raw wood. Dynamic detection members and multiple swing angle detections that individually detect the swing amount of each detection member A turning axis suitable for turning the raw wood based on the detector, the detection signal of the rotation angle detector and the contour data of the distance detector, and further adding the contour data of the swing angle detector, A centering processing apparatus for raw wood, comprising a centering calculation mechanism for calculating a maximum turning radius corresponding to the shaft center.   5. The raw wood centering apparatus according to claim 4, further comprising reflective distance detectors at least at two locations near both ends of the raw wood.   6. The raw wood centering apparatus according to claim 5, further comprising a reflection-type distance detector at one location near the center of the raw wood.   The raw wood centering processing apparatus according to claim 4, comprising a detection member provided with a flat plate-shaped detection tool.   The raw wood centering apparatus according to claim 4, further comprising a detection member provided with a cylindrical detection tool.

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