JPS62201754A - Method of measuring out veneer to constant length - Google Patents

Abstract

PURPOSE:To stably measure out a veneer to a constant length, by providing a control mechanism for releasing the operation of an intermittent drive mechanism and for operating the intermittent drive mechanism after an arbitrary time elapses. CONSTITUTION:Any one of detectors 10 detects the arrival of the leading end of a veneer 5 conveyed at a normal conveying speed by a conveyer 1, at a predetermined decelerating position, and delivers a signal to a control mechanism 11 which therefore controls such that the operation of a slippable intermittent drive mechanism 8 disposed in a drive mechanism 6 for running the conveyer 1 is released and is again made after an arbitrary time elapses. ACcordingly, the veneer 5 is once decelerated during conveyance and is made to abut at its leading end against rulers 9 at a speed lower than a normal conveying speed just after the operation of the intermittent drive mechanism 8, thereby it may be measured out to a constant length.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for setting a ruler on a veneer veneer.

As is well known, in the process of manufacturing plywood, it is often necessary to measure the veneer veneer (hereinafter simply referred to as veneer) while transporting the veneer. When the tip of the veneer is brought into contact with a ruler arranged perpendicular to the conveyance direction of the conveyance mechanism that conveys the veneer, and the ruler is removed from the tip, a comparatively convenient method for conveyance is used. Assuming direct contact is made at a high normal transport speed, as is well known, there is a principle that the kinetic energy of an object increases or decreases in proportion to the product of the object's own weight (mass) and the square of the speed. It is unavoidable that the collision energy of the veneer will increase, and this will cause the veneer to rebound from the ruler and slip, or the tip of the veneer - the weak part, the joint part, etc., will be damaged. occurs, and good ruler alignment cannot be performed.

Therefore, in the past, for example, a detector was provided to detect when the tip of the veneer reached a certain position separated by an arbitrary distance from the ruler, and the tip of the veneer was detected based on the detection signal from the detector. Before the tip reaches the ruler, the conveyance speed is decelerated to bring it into contact with the ruler at a relatively low speed, or based on the detection signal, the conveyance mechanism is driven immediately before the tip reaches the ruler. Improvements were made to make it come into contact with a ruler by using inertia, and it was put into practical use, with considerable success.

However, as is well known, the weight of each veneer differs significantly depending on the specific gravity and water content, so the kinetic energy of each veneer will inevitably differ individually. Regardless of whether the conveyance speed is reduced as in the case of reducing the conveyance speed, or the drive of the conveyance mechanism is cut off, due to the above-mentioned differences, it is inevitable that the collision energy of heavy veneers tends to be greater than that of light veneers. For example, if a light veneer is used as the standard, the occurrence of the above-mentioned problems cannot be completely prevented in both of the ii4 improvement examples, or conversely, if a heavy veneer is used as the standard, the former (deceleration In the case of
In either case, it is difficult to avoid the above-mentioned inconveniences and perform stable and good ruler placement, which causes the problem that the light veneer cannot reach the ruler. The reality is that no solution has been reached.

The present invention was developed in order to eliminate the drawbacks of the conventional method, and has an extremely simple and rational configuration, and is hardly affected by the difference in the weight of the veneer, and can stably and accurately set the ruler. This paper aims to rationalize the veneer processing process in plywood factories by providing a ruler placement method that makes it possible to Each time the tip of the veneer passes through the predetermined deceleration position, the The operation of the slippery intermittent drive mechanism interposed in the drive device for driving the conveyance member is released, and the control mechanism controls the intermittent drive mechanism to be re-operated after an arbitrary time, and the control mechanism is operated immediately after the operation of the intermittent drive mechanism. The tip of the veneer is brought into contact with a ruler at a low speed below the normal conveyance speed, and the ruler is removed.

With such a configuration, it goes without saying that extreme collisions, which would cause the above-mentioned inconveniences due to the slowing of the speed of contact with the ruler, can be well alleviated, and also the difference between light veneer and heavy veneer can be reduced. Since there is no large difference in the collision energy of the plates, it is possible to stably and accurately set the ruler without being affected by differences in the weight of the veneers, which is effective.

That is, for example, during the deceleration process, a heavy veneer is transported to a position closer to the ruler than a light veneer due to the difference in kinetic energy due to the difference in its own weight, so in the next speed increase process, Compared to a light veneer, it will come into contact with the ruler in a shorter acceleration period, and due to the difference in inertia, the intermittent drive mechanism will have an effect of increasing slip, and it will accelerate more gently than a light veneer. As a result, the speed of contact with the ruler is slower than that of a light veneer (of course, the opposite is true for a light veneer), and as a result, the collision energy between a slow, heavy veneer and a fast, light veneer increases. There will no longer be a big difference.

Therefore, no matter which one is used as the basis for effectively mitigating excessive or violent collisions, there is no risk of problems (errors due to differences in self-weight) as in the conventional methods described above, and the stability is improved compared to the conventional method. This is effective because it allows for good ruler alignment.

Hereinafter, the present invention will be explained in further detail based on an example of implementation illustrated in the drawings.

Fig. bg1 is a plan explanatory view of an apparatus applied to implement the ruler setting method according to the present invention, and Fig. 2 is a side explanatory view of the apparatus illustrated in Fig. 1.

In the figure, reference numeral 1 denotes a belt conveyor having a shaft 2, a pulley 3, a belt 4, etc., and is driven by a drive device 6, which will be described later, to cause the veneer 5 to travel in the direction of the arrow in the figure.

Reference numeral 6 denotes a drive device having a drive source 7 such as an electric motor and an intermittent drive mechanism 8 that can slip, such as an intermittent drive mechanism 8 that includes a friction clutch.
The conveyor 1 is intermittently driven by the control.

Reference numeral 9 denotes a ruler disposed perpendicular to the conveyance direction of the conveyor 1, and is a ruler that is arranged to be perpendicular to the conveyance direction of the conveyor 1, and is a ruler that
The ruler is placed on the tip end of the veneer 5 to make a ruler on the tip end side.

10 is a detector disposed at a predetermined deceleration position set at an appropriate distance from the ruler 9, and detects when the leading end of the veneer 5 conveyed by the conveyor 1 has reached the predetermined deceleration position. , issues a detection signal to a control mechanism 11, which will be described later.

Reference numeral 11 denotes a control mechanism, and a drive device 6 drives the conveyor l every time the tip of the veneer 5 passes the predetermined deceleration position based on a detection signal from the detector lO.
The operation of the intermittent drive mechanism 8 which is capable of slipping is released, and the intermittent drive mechanism 8 is controlled to be operated again after an arbitrary period of time (for example, after the conveyor I has stopped once).

12 is a detector installed adjacent to the ruler 9,
It is detected that the tip of the ruler 9 has come into contact with the ruler 9, and a detection signal is sent to the actuating mechanism 13, which will be described later.

Reference numeral 13 denotes an operating mechanism which, based on the detection signal from the detector 12, causes the ruler 9 to fall to the state shown by the dotted line each time the tip of the veneer 5 comes into contact with the ruler 9.
After a predetermined period of time (after the veneer 5 has passed), the ruler 9 is operated to return to the state shown by the solid line.

The ruler setting method according to the present invention is carried out using, for example, a device configured as described above, and is performed when the tip of the veneer 5, which is conveyed by the conveyor l at a normal conveyance speed, reaches a predetermined deceleration position. When one of the detectors 10 detects this and issues a detection signal to the control mechanism 11, the control mechanism 11 controls the slippery intermittent drive mechanism 8 interposed in the drive device 6 that runs the conveyor 1. Since the operation is released and the intermittent drive mechanism 8 is controlled to be re-operated after an arbitrary time, the veneer 5 is once conveyed at a deceleration and then transported at a low speed below the normal conveyance speed immediately after the operation of the intermittent drive mechanism 8. The tip is brought into contact with the ruler 9 at a high speed, and the ruler is drawn out. When each detector 12 detects that the tip of the veneer 5 has come into contact with the ruler 9 and sends a detection signal to the actuation mechanism 13, the actuation mechanism 13 causes the ruler 9 to fall over as shown by the dotted line. Therefore, the veneer 5 will continue to be conveyed in the direction of the arrow shown in the figure, but as the speed at which it comes into contact with the ruler decreases, the veneer will rebound from the ruler and slip.
Alternatively, drastic collisions that may cause damage to the tip Φ soft part, joint part, etc. of the veneer are effectively alleviated, and it is possible to perform good ruler alignment.

Moreover, as illustrated in the velocity diagram of a single plate in Figure 3,
Due to the difference in weight, a light veneer transported to a predetermined deceleration position at a normal transport speed V undergoes a deceleration process and an acceleration process as shown by the dotted line Ll, while a heavy veneer undergoes a deceleration process and an acceleration process as shown by the solid line L2. After the acceleration process, there will be a difference in how each reaches the ruler position, and inevitably there will be a difference in the speed at which they contact the ruler, so there is no risk of a large difference in the collision energy between the two, regardless of the difference in the weight of the veneer. Stable ruler placement is possible.

In other words, as is clear from Figure 3, during the deceleration process, a heavy veneer is transported to a position closer to the ruler than a light veneer due to the difference in kinetic energy due to the difference in its own weight. During the speed increase process, the veneer comes into contact with the ruler in a shorter acceleration period than a light veneer, and since the inertia is greater than that of a light veneer, the intermittent drive mechanism inevitably slips. Since the amount increases and it is accelerated more gently than a light veneer, the speed v2 at which the light veneer contacts the ruler becomes slower than the speed V1 at which the light veneer contacts the ruler.
Based on the basic principle, there is no risk that there will be a large difference in the collision energy between a fast, light veneer and a slow, heavy veneer, and stable ruler placement can be achieved at all times.

As is clear from the above, according to the ruler setting method according to the present invention, it is possible to carry out better ruler setting more stably and effectively than in the past, almost unaffected by the difference in the weight of the veneer. .

In the above embodiment, the veneer after the ruler removal was continued to be transported in the same direction as the conveyance direction. For example, as disclosed in ``Plywood manufacturing method'' (Japanese Patent Laid-Open No. 52-134005), a regulating body disposed above the central part of the conveyance mechanism so as to be able to rise and fall, There is no problem with suppressing the fall, or, for example, using a veneer veneer for changing direction (1987 Utility Model).
As disclosed in Japanese Pat. There is no problem even if the direction is changed to the direction perpendicular to the direction and the conveyance is carried out. Furthermore, as disclosed in, for example, "Method and device for pricking and conveying veneer veneer" (@Kokai No. 56-113652), The veneer receiver installed opposite to the pricking member is movably disposed above the conveying mechanism, and the veneer can be stuck to the pricking member by actuation of the member, etc., and the veneer can be transferred in any direction. There is no problem and it is possible to process in various conventionally known forms, and of course, in any case, if necessary, the ruler can be changed to a fixed type, and the ruler placement can be confirmed. The transport mechanism may be temporarily stopped by utilizing the detection signal of the detector.

Further, the conveyance mechanism is not limited to the belt conveyor as in the above embodiment, and various known conveyance mechanisms such as a roller conveyor or chain conveyor may be used. The inertia of the mechanism also affects the collision energy of the veneer in relation to the frictional force of the transport mechanism against the veneer (the product of the friction coefficient and the veneer's own weight), the capacity of the intermittent drive mechanism, etc. Although it may be theoretically possible to make the collision energy of a light veneer and a slow, heavy veneer exactly the same, it is extremely difficult in practice. Therefore, it is desirable to reduce the inertial force of the conveyance mechanism as much as possible, and to appropriately set the coefficient of friction for the veneer to reduce the degree of influence caused by the conveyance mechanism.

Furthermore, the intermittent drive mechanism is not limited to the friction clutch as in the above-mentioned embodiments; for example, as illustrated in FIG. (not shown), the contact roll 14 rotated in the direction of the arrow in the figure is oscillated by an actuating member 16 made of a fluid cylinder or the like at an appropriate time. Any form of intermittent drive mechanism may be used as long as it is capable of being driven and slipping is possible during driving.

Further, the shape of the ruler is not limited to the shape as in the above embodiments, and may include, for example, a roll-shaped ruler as disclosed in "Position control device for veneer veneer" (Japanese Utility Model Publication No. 30008/1983). Various known shapes may be used.

Also, as in the above embodiment, after the conveyance mechanism has stopped,
If the intermittent drive mechanism is reactivated, the difference in collision energy between a light veneer and a heavy veneer tends to be smaller, which is preferable, but is not necessarily limiting.
Since the basic effect of reducing the difference in the collision energy between the two is performed through a deceleration process, there is no problem in restarting the intermittent drive mechanism before the conveyance mechanism stops.

Furthermore, in the above embodiment, the conveyance mechanism is naturally decelerated due to the rotational resistance of the shaft, etc. However, from the viewpoint of streamlining the process, for example, a braking system such as an electromagnetic brake, an air brake, etc. In addition to intervening a mechanism, the braking mechanism is controlled to operate based on a detection signal from a detector, and the conveying mechanism is forcibly decelerated, thereby shortening the deceleration time (deceleration distance III). is effective. However, in this case, if the transport mechanism and the veneer slip, there is a risk that the ruler placement will become unstable, so it is necessary to appropriately select the braking capacity of the braking mechanism and the friction coefficient of the transport mechanism against the veneer. There is.

The time from when the intermittent drive mechanism is restarted until the veneer comes into contact with the ruler can be set as appropriate depending on the amount of correction required for the veneer against the ruler, etc., but in order to reduce the collision energy, It is effective to make it as short as possible within the allowable range, and preferably, when the veneer conveyance speed reaches the minimum speed (including zero), the leading edge of the heaviest veneer is
The tip of the side that follows is already in contact with the ruler, and only for a sufficient time to bring the tip of the other succeeding side into contact with the ruler.
It is preferable to restart the intermittent drive mechanism, and it is ideal to set the predetermined deceleration position and the control form of the intermittent drive mechanism to meet or adapt to such conditions.

Furthermore, as in the above embodiment, if the detectors are arranged on both the left and right sides of the transport mechanism and the leading edge of either side is detected, regardless of the amount of correction required for the ruler of the veneer. This is effective because it can stably control the operation of the intermittent drive mechanism, but if the amount of correction required for the veneer ruler is not extremely large, it is possible to place the detector in one place (preferably in the center of the conveyance mechanism). Even if it is provided only at the rear end, there is almost no practical problem, and for example, if the veneer is a fixed length veneer, even if it is provided at the rear end, it will not cause any problem in practical terms. It is possible to detect when the vehicle reaches a predetermined deceleration position.

Further, in the above embodiment, the veneer was transported by an integrated transport mechanism, but for example, the transport mechanism could be divided into left and right halves, and each transport mechanism could be equipped with a detector and a slipper. By installing an intermittent drive mechanism (as well as a braking mechanism if necessary) and controlling each conveyance mechanism separately in the order of the fertilizer, it will be possible to adjust the veneer ruler regardless of the amount of correction required. , it is even more effective because it can approximate the left and right collision energies of the veneer.

[Brief explanation of drawings]

The drawings are for explaining the invention. FIG. 1 is a plan explanatory view of an apparatus applied to implement the ruler setting method according to the present invention, FIG. 2 is a side explanatory view of the apparatus illustrated in FIG. 1, and FIG. 3 is a velocity diagram of a veneer. FIG. 4 is a side view of another embodiment of the intermittent drive mechanism. 1... Belt conveyor, 5... L plate, 6... Drive device, 7... Drive source, 8. Intermittent drive mechanism consisting of fist and friction clutch, 9ψφ ruler, 10... Detector, 1
1φ...Control mechanism, 12...Detector, 13-...Operating mechanism, 18...Other intermittent drive mechanism Patent applicant Meinan Seisakusho Co., Ltd. Figure 2 Figure 8 Ruler Reduction position a position position

Claims (1)

[Scope of Claims] 1. When bringing out the ruler by bringing the tip of the veneer veneer into contact with a ruler arranged perpendicular to the conveyance direction of the conveyance mechanism that conveys the veneer veneer, the veneer veneer is placed at an appropriate distance from the ruler. Based on a detection signal from a detector that detects when the tip of the veneer veneer reaches a predetermined deceleration position separated from the other, the conveyance mechanism is driven each time the tip of the veneer veneer passes the predetermined deceleration position. The control mechanism releases the slippery intermittent drive mechanism interposed in the drive device and controls the intermittent drive mechanism to re-operate after an arbitrary period of time. A method for taking out a ruler on a veneer veneer, characterized by bringing out the ruler by bringing the tip of the veneer into contact with a ruler at a speed lower than that of the veneer veneer. 2. A method for setting a ruler on a veneer veneer according to claim 1, which comprises controlling the intermittent drive mechanism to restart after the conveyance mechanism has once stopped. 3. A method for setting a ruler on a veneer veneer according to claim 1 or 2, which uses a friction clutch as an intermittent drive mechanism.