JPH0127843B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a centering device for plywood logs that determines the tracking center of the log when cutting the log with a veneer lace.

[Prior art]

When cutting raw wood using a veneer lace to produce a veneer veneer (hereinafter referred to as veneer), a centering operation of the raw wood is performed to determine the center of the end surface of the raw wood that is chucked by a spindle. Conventional centering devices, for example, capture both end faces of a log as images with the same magnification, and project the images of one end face and the other end face horizontally and overlappingly, and use this overlapping image and a concentric circle diagram to A device that determines the core position of logs is generally known, but since this conventional device determines the core position using overlapping images and concentric circles, it requires a lot of incidental equipment such as a projection device and a reflection device, and is expensive. In addition to the cost,
This had the disadvantage of requiring a large amount of installation space. For example, as shown in Italian Patent No. 619157, three centering arms are arranged around three support shafts arranged on the same circumference in a pair of opposing shoes that receive logs. , with the logs being rotatably supported at the same angle and with the centering arms aligned in the tangential direction of the circle on the support shaft, the raw wood is dropped by its own weight from an upper conveying means to the shoe; Devices for centering logs are known.

[Problem to be solved by the invention]

However, the raw wood itself is large in diameter and contains a lot of moisture, making it extremely heavy, so in the case of the Italian patent, in which the raw wood is directly dropped and placed on the shoe, There is a risk that the logs and shoes may be damaged or deformed. In the case of damaged logs,
In addition to poor material yield, if the shoe is damaged or deformed, the centers of rotation of the three centering arms may deviate from the same circumference, causing the possibility that the raw wood cannot be centered accurately. have. The object of the present invention is to solve the above-mentioned conventional drawbacks, and to provide a centering arm that receives a supplied log and moves it to the initial centering position, and then moves the centering arm in the centripetal direction from the initial centering position. This series of operations allows for efficient centering work while reducing the size and cost of the device, as well as reducing the impact of the logs on the centering arm when supplying logs to prevent damage to the device and the logs. To provide a centering device for plywood logs that can perform centering work of logs with high precision over a long period of time while preventing the above problems.

【Example】

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of a centering device for plywood logs according to the present invention. FIG. 1 is an explanatory diagram showing an example of the arrangement of the centering device according to the present invention, and FIG. 2 is a schematic plan view of FIG. The raw wood W is held by the provided claws 2c and then supplied to the centering device 3. Support shafts 4a to 4c constituting the centering device 3 are arranged concentrically, and centering arms 6a to 6c are supported on the support shafts 4a to 4c so as to be rotatable in the centrifugal direction and the centripetal direction. and the centering arm 6
Link bars 9 are attached to the link parts 7a and 7b of a and 6b.
a is supported via mounting shafts 8a and 8b, and link cylinders 9b constituting the first actuating member are supported by link portions 7c and 7d of centering arms 6b and 6c via mounting shafts 8c and 8d, respectively. ing. Among the centering arms 6a to 6c, the centering arm 6c is rotated independently of the other centering arms 6a and 6b as the link cylinder b operates. That is, the link bar 9a is connected to the mounting shafts 8a, 8b and the support shafts 4a, 4.
straight lines a and b connecting support shafts 4a and 4b are parallel to each other, and straight line c connecting support shafts 4a and 4b and mounting shaft 8
It is attached so that the straight line d connecting the lines a and 8b is parallel to each other. The link cylinder 9b is similarly attached to the link portions 7c, 7d via attachment shafts 8c, 8d. As shown in FIG. 4, since the centering arms 6a to 6c are arranged at right angles to each other on the same circumference, the support shafts 4a to 4
The mounting angles of the centering arms 6a to 6c with respect to each tangent L of the circle C at c are set to be the same angle α. An actuating member 5 such as a fluid cylinder constituting a second actuating member is connected to the link portion 7b of the centering arm 6b, and as the actuating member 5 operates, the centering arms 6a to 6c move toward their respective supports. It is rotated in the centrifugal direction and centripetal direction around the shafts 4a to 4c. Further, the operating member 5 is provided with fluid pressure.
A fluid pressure detector 10 is installed to detect when the PF has reached a predetermined pressure or higher. The log mounting device 11 is arranged such that the tip end 12a is located at the core position A of the centered log W,
It is mainly composed of a mounting arm 15 that clamps the log W through a chuck by a clamping member 13 such as a fluid pressure cylinder, and is rotatably driven by a rotating member 14 such as a fluid pressure cylinder. The center position A of W is located at the axis position of the spindle 17 of the veneer race 16. The spindle 17 chucks the log W by its propulsion. Next, the operation of this embodiment will be explained with reference to FIGS. 3 to 5. When supplying raw wood W, link cylinder 9
The rod b is reduced in size, and as shown in FIG. 3, the centering arm 6c is swung around the support shaft 4c with its tip toward the centering arm 6a, and is positioned so as to be able to receive the original thin film W. (Direction B in the figure). Supply conveyor 2a, 2
As shown in FIG.
Supported by a. At this time, the centering arm 6c
has already been rotated upward as shown in FIG. 3, and the falling distance of the log W with respect to the centering device 3 is shortened, so that damage to the centering device 3 and the log W is prevented. Moreover, since the centering arm 6c is connected to the link cylinder 9b, the centering arm 6c
When the log is received on the centering arm 6c, the impact of the log W against the centering arm 6c is absorbed by the link cylinder 9b. and link cylinder 9b
When the centering arm 6c receiving the raw wood W is rotated in the direction C in the figure as the centering arm 6c moves back (extension), the raw wood W is gradually guided and guided by the centering arm 6c and the centering arm 6a. While being rotated, the centering arm 6b is placed on the centering arm 6b as shown in FIG. As a result, the rotation of the centering arm 6c causes the log W to move toward the other centering arm 6.
This prevents it from being placed directly on top of b and reduces the impact when it is placed. After the log W is placed on the other centering arm 6b, the centering arm 6c is rotated to the initial centering position in the same way as the other centering arms 6a and 6b. This centering initial position is defined by the tangent line of the support shafts 4a to 4c on the circumference passing through each of the support shafts 4a to 4c, and each of the centering arms 6a to 6.
An angle that almost matches with c and is small,
That is, it is a position where the space formed by each of the centering arms 6a to 6c is relatively wide and various outside diameter logs W can be positioned within the space. Next, when the actuating member 5 is actuated while the link cylinder 9b remains extended, each centering arm 6a
-6c are rotated at the same angle θ in the centripetal direction from the initial centering position around the support shafts 4a-4c. When each of the centering arms 6a and 6c comes into contact with the outer peripheral surface of the log, the centering arm 6a and 6c contact each other by the above operation.
Since a to 6c coincide with the distances l1, l2, and l3 between the center of the circle connecting the support shafts 4a to 4c and the log contact position, the core position A of the log W is always supported regardless of its diameter. The log W is centered by matching the center of the circle connecting the axes 4a to 4c. Then, as shown in FIG.
When detecting that the centering arms 6a to 6c are in contact with the outer peripheral surface of the raw wood W and the fluid pressure PF of the actuating member 5 has reached a predetermined pressure or higher, the operation of the actuating member 5 is stopped by the output signal. At the same time, the rotating member 14 of the log mounting device 11 is operated to rotate the tip of the mounting arm 15 to the core position A of the log W, and then the clamping member 13 is activated to clamp the log. When the fluid pressure PF of this clamping member 13 reaches a predetermined pressure, the operating member 5 is operated to return and the rotating member 14 is operated to move the log W into the veneer lace 1.
When the axis of the spindle 17 and the core position A of the log W coincide with each other by rotating to the 6 side, the spindle 17 is propelled to chuck the log W, and when the propulsion pressure of the spindle 17 reaches a predetermined pressure. , the clamping member 13 and the rotating member 14 are respectively operated to return to release the clamp of the raw wood W by the mounting arm 15, and are rotated back to the original position. Therefore, when the centering device 3 of this embodiment moves the log W to the initial centering position, the centering device 3 uses the centering arm instead of providing a receiving arm in addition to the centering arm as in the conventional device. The log W can be moved to the initial centering position and centering work can be performed.
It is possible to reduce the size and cost of the device. In addition, the log W received on the centering arm 6c
Compared to the conventional centering device in which the link cylinder 9b falls onto the centering arm as the link cylinder 9b operates, the impact on the centering arm can be reduced, improving the durability of the device and preventing damage to the raw wood W. can be effectively prevented. Furthermore, since the process from receiving the raw wood W to the centering operation can be performed by a series of operations of rotating the centering arms 6a to 6c, the centering operation can be performed extremely efficiently. In this embodiment, the support shafts 4a to 4c are arranged so that the centering arms 6a to 6c are perpendicular to each other, but in the present invention, the support shafts 4a to 4c are arranged at arbitrary positions on a concentric circle. Also, regardless of the size of the outer diameter of the log W, the core position A is always concentrated at a certain point,
It is possible to perform centering work on the raw wood W. In addition, although the centering device 3 of this embodiment is placed before the log mounting device 11, it is located below the spindle 17 in the veneer race 16 and at a position where the center position A of the log W and the axis of the spindle 17 coincide. Although this embodiment has been described as a centering device that determines the tracking center, in order to improve the yield when cutting raw wood W into predetermined lengths, It can also be applied as a device for determining the perpendicular position to the core direction of W. Furthermore, in this embodiment, the centering device 3 is arranged at two locations on the butt side of the raw wood W, but as shown in FIG. Centering work can also be performed by arranging the centering arm 6a at the center of W, and in this case, manufacturing costs can be reduced by reducing the number of parts. Furthermore, in this embodiment, the fluid pressure detector 1 is attached to the actuating member 5.
As shown in FIG. It is also possible to implement a configuration in which the operation of the actuating member 5 is stopped when the contact pressure of the actuating member 5 is detected. Further, after receiving the log W from the log supply device 1 with the centering arms 6a to 6c swung in the centripetal direction, the centering arms 6a to 6c are swung in the centrifugal direction and the centering arms 6a to 6c are Any one of the pressure detectors 18a to 18c attached to the centering arms 6a to 6c receives the raw wood between the centering arms 6c and swings the centering arms 6a to 6c in the centrifugal direction.
The present invention can also be implemented by controlling the actuating member 5 to stop operating and perform centering work when the wood W changes from a pressed state to a non-pressed state, that is, when the detection signal is reversed. It is. Furthermore, as shown in FIG. 8, a link cylinder 19 is provided in place of the link bar 9a, and a link bar 20 is provided in place of the link cylinder 9b. 19
This can be carried out even if the log W is received by the centering arms 6b and 6c by reducing the rod and swinging the centering arm 6a in the centrifugal direction and the centering arms 6b and 6c in the centripetal direction. It is possible.
Also, a link bar is used instead of the link cylinder 9b to connect the centering arms 6b and 6c, and the fourth
Even if the configuration is such that the log W is supplied in the state shown in the figure and the centering work is performed, it can be implemented in the same manner.

【effect】

As explained above, the present invention receives the supplied raw wood by at least one centering arm that is rotated upward in accordance with the operation of the first actuating member, and guides it onto the other centering arm. Compared to conventional equipment in which the logs are dropped directly onto the centering arm for guidance, the impact on the centering arm is reduced, increasing the durability of the device, and it is also possible to prevent damage to the logs due to falling. can. Furthermore, since the centering arm is used to receive logs, the device can be made smaller and less expensive than conventional devices in which a receiving arm or the like is provided separately and received by the centering arm. The log can be centered by rotating all the centering arms at the same angle in the centripetal direction from the initial centering position, so the centering arm can handle everything from receiving the supplied log to centering it. This can be efficiently performed by a series of operations by rotating the .

[Brief explanation of drawings]

FIG. 1 is an explanatory side view showing an example of the arrangement of the centering device according to the present invention, FIG. 2 is an explanatory plan view of FIG. 1, and FIG.
The figure is an explanatory diagram showing the log receiving state of the centering device.
The figure is a side view showing the configuration of the centering device, FIG. FIG. 8 is an explanatory diagram showing another example in which a detector is attached, and FIG. 8 is an explanatory diagram showing another example of a centering device, in which 1 is a raw wood supply device, 3 is a centering device, 4a to 4c are support shafts, 6a to 6c are centering arms.

Claims (1)

[Claims] 1. At least 3 on the same circumference in a substantially vertical plane
Centering arms 6a, 6b, 6c supported rotatably in a direction parallel to the perpendicular plane with respect to each support shaft 4a, 4b, 4c arranged at a location, and receiving raw wood W to be supplied. Rotating at least one centering arm between a possible position and an initial centering position where the angle formed by the tangent to each support axis on the circumference and the other centering arm substantially matches. a first actuating member 9b that causes the other centering arms to support the received raw wood W; and at least three centering arms, respectively, at the same rotation angle in the centripetal direction from the initial centering position. The second actuating member 5 to be rotated and the first actuating member 9b are actuated to rotate at least one centering arm upward and wait, thereby making it possible to receive the raw wood, and 1st
The actuating member 9b is operated in the opposite direction to rotate the centering arm that has received the raw wood to the initial centering position, and after the received raw wood W is supported by another centering arm, the second centering arm is rotated to the centering initial position. The actuating member 5 is operated to rotate each centering arm 6a, 6b, 6c in the centripetal direction at the same angle from the initial centering position, so that all the centering arms 6a, 6b, 6c contact the outer peripheral surface of the log. A control device for stopping the operation of the second actuating member 5 when the second actuating member 5 comes into contact with the centering device for plywood logs.