JPH0340682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a timing control method for a joint press and an apparatus that can suitably carry out the method.

BACKGROUND OF THE INVENTION Various woodworking machines have been proposed to make effective use of limited wood resources, and among these woodworking machines, finger joint devices have been attracting attention. This method is made from pieces of wood that have defects such as joints, bends, and cracks that have no value and must be disposed of as waste. By cutting out only the usable parts and joining them together, it can be used as building materials and furniture materials. This is a device for producing laminated wood that can be used for commercial purposes.
For example, from the wood piece 10 shown in FIG.
(Fig. 1b), and at the same time make numerous chevron-shaped cuts 1 called fingers on both ends of this piece of wood 12.
4 (Figure 1c). And these pieces of wood 1
2 are sequentially arranged in series so that the finger portions 14 engage with each other (FIG. 1 d), and then compressed in the axial direction as a whole to form a long straight material 16 (No. A woodworking machine that can obtain the results shown in Figure 1e) and automatically performs a series of these steps is called a finger joint device.

This finger joint device removes defects from a piece of wood that has defects as a processing material and makes it usable for practical use, so it is an excellent tool in terms of woodworking technology in that it can effectively utilize wood resources. It should be highly evaluated. Here, 12 pieces of wood
The process of interlocking the finger portions 14 of the There is a so-called multi-joint, in which a plurality of finger joints are present at required intervals, as shown in FIG. 2b.

Problems to be Solved by the Invention Regardless of whether the joining form is the single joint or multi-joint, what is commonly required for these joints is the finger joint device shown in FIG. The temporarily joined finger joint 18 is connected to the two clamps 20, 2.
It is necessary to perform joint pressing only when the joint is located between 2 and 2, and joint pressing must not be performed while the temporarily joined finger joint 18 is held by the clamp 20. This is because, as shown in FIG. 4, when the finger joint 18 temporarily connected between the horizontally movable press table 24 and the clamp 20 is held under pressure, the joint press operation cannot be performed. However, this is the only area where no compression bonding is performed.

In order to solve this problem, for example, the length of the joint material that is joint-pressed and sent out as a single long material is measured, and each time the joint material advances by distance L in Fig. 4, the joint material is automatically moved. It may be configured to perform an intrapress. This distance L is assumed to be a position that starts from the inside of the clamp 20 on the right side in FIG. That is, the temporarily joined finger joint 1
8 shows that the part must be located between the two clamps 20, 22 when it has moved by a distance L.

However, the length of the fingered wood pieces 12 is not always the same, and in many cases, long pieces of wood and short pieces of wood are randomly mixed together and supplied to the joint press device. For this reason, if the pressing work is automatically performed every time the pieces of wood to be joined are fed out a predetermined length, for example the distance L mentioned above, the dimension longer than the distance between the two clamps 20 and 22 When long pieces of wood are supplied, the following problems occur. That is, both the front and rear pieces of wood 12, 12 to be joined
The finger joint 18 in both clamps 2
Even though there is no difference between 0 and 22, meaningless pressing work is performed, resulting in a loss of time and energy in the process.

OBJECTS OF THE INVENTION The present invention has been devised in view of the above-mentioned drawbacks inherent in the prior art, and is directed to the joint when a temporarily joined finger joint is located between two clamps. If a long piece of wood that exceeds the specified length is supplied during press work, the supply will be stopped when the tip of the piece of wood is located between both clamps, and the wood piece that is in front will be It is an object of the present invention to provide a timing control method and device for a joint press that resumes feeding after joint pressing an end portion.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the intended purpose, the present invention continuously supplies pieces of wood in series, each having a chevron-shaped finger portion at its leading end and its rear end. In finger joint processing, in which a joint press is performed between a piece of wood and a subsequent piece of wood to produce a bonding material that is glued at the finger part, a first clamp that can grip the subsequent piece of wood is used. In addition to detecting a group of pieces of wood that arrive one after another in front, the length of the following piece of wood is measured while the preceding piece of wood is being fed, and while the length of the following piece of wood is being measured, the tip of this piece of wood is detected. exceeds the downstream end of the first clamp, and the detection of the succeeding piece of wood is completed, the feeding of the succeeding piece of wood is stopped, joint pressing is performed between the preceding piece of wood and the following piece of wood, and the following piece of wood is During the length measurement, if the tip of the succeeding piece of wood reaches the joint tolerance limit position that exists between the first clamp and the second clamp that can grip the preceding piece of wood, the feeding of the succeeding piece of wood is stopped. The method is characterized in that the preceding piece of wood and the following piece of wood are joint pressed.

Further, a timing control device for a joint press according to another invention of the present application includes a fixed table provided on a base, and a fixed table provided on the base so as to be horizontally slidable, and biased by a predetermined drive source. a slide table that moves toward and away from the fixed table; a first clamp member that is disposed on the slide table and is driven up and down by a drive source to grip a subsequent piece of wood; and a first clamp member that is disposed on the fixed table and that is driven by a drive source. a second clamp member that is driven up and down by a second clamp member that grips a preceding piece of wood; a second clamp member that is arranged upstream of the slide table; and a second clamp member that is arranged close to the piece of wood conveyor and that detects the arrival of a group of pieces of wood; It consists of a detection means, and a measuring means disposed on the fixed table to measure the sending distance of the piece of wood, and a finger part provided at the rear end of the leading piece of wood and a finger part provided at the front end of the following piece of wood. , the first clamp member and the second clamp member are configured to be joint pressed.

Embodiment Next, a timing control method for a joint press according to the present invention will be described below with reference to the accompanying drawings in relation to an apparatus for implementing the method. FIG. 5 is a schematic perspective view of a finger joint press device according to a preferred embodiment of the present invention, and FIG. 6 is a side view of the device. In the figure, a fixed table 28 and a slide table 3 are provided on the top surface of a box-shaped base indicated by reference numeral 26.
0 are placed adjacent to each other. slide table 30
is horizontally slidable with respect to the base 26 via a "dovetail groove" 32, and can be moved toward and away from the fixed table 28 by the urging of a fluid pressure cylinder 34.

Further, a first clamp member 36 is disposed above the slide table 30 so as to be movable up and down, and is driven up and down by a fluid pressure cylinder 38. In this case, the first clamp member 36 and the cylinder 38 for lifting and lowering the slide table 3
0, and when the table driving cylinder 34 is energized, the slide table 3
0 is the first clamp member 36 and cylinder 38
Of course, it is constructed so that it can be moved horizontally while being equipped with.

A second clamp member 40 is also disposed above the fixed table 28, and the second clamp member 40 is driven up and down by a hydraulic cylinder 42. Further, between the first clamp member 36 and the second clamp member 40, and between both tables 30,
A horizontal plate 44 for pressing a piece of wood is located above 28, and this horizontal plate 44 is driven up and down by a vertical cylinder 46.

Upstream of the first clamp member 36, a belt conveyor 48 for conveying wood pieces is horizontally arranged at the same horizontal level as the slide table 30. A roll 50 for feeding the wood chips 12 is disposed above the belt conveyor 48, and this roll 50 is rotationally driven by a motor 52 and is configured to be freely raised and lowered by a hydraulic cylinder 54.

Furthermore, a feeding roll 50 and a belt conveyor 4
A detector 56 for detecting the arrival of the piece of wood 12 is disposed between the wood piece 8 and the wood piece 8 or at a position slightly shifted upstream from this. This detector 56 includes, for example, light emitters 5 installed at a predetermined distance with their optical axes aligned.
6a and a light receiver 56b, which turns on when a piece of wood arrives and blocks the light, detects the arrival of the piece of wood, and turns off when a piece of wood passes is preferably used. Note that a wavelength roller 58 is provided downstream of the second clamp member 40.
is arranged to input a signal from a pulse generator 60 such as a rotary encoder to a control circuit shown in FIG.

Furthermore, in FIG. 5, the reference numeral 62 indicates a rotary circular saw that rises according to an electric command and cuts the bonding material to a predetermined length.
This circular saw 62 is used to cut the joining material, which has been subjected to joint pressing and arrives as a single long member, into appropriate dimensions according to the requests of the user or the like. Therefore, a control device (not shown) issues cutting commands to the rotary circular saw 62 at appropriate times in accordance with the input cutting dimensions.

Next, FIG. 7 is a control block circuit diagram for controlling the timing of the joint press apparatus according to the embodiment, in which symbols C ₁ and C ₂ indicate preset counters, 64 is a comparison circuit, and 66 is a control block circuit diagram. Instructs the mental arithmetic memory command circuit.

In addition, in FIG. 8, the distance from the position B located upstream by a distance α from the inner position A of the second clamp member 40 to the detector 56 is L ₁ , and the distance from the position B to the detector 56 is L 1 .
Assume that the distance from the position C to the inner position C of the first clamp member 36 is _L2 , and the distance from the position C to the detector 56 is _L3 . At this time, from position A to position C
The distance (α+L ₂ ) indicates the safety zone within which joint pressing at the finger joint 18 is permitted, as previously described in connection with FIG. Further, the distance α is a distance in which movement due to inertia is expected in relation to the supply speed of the wood pieces 12. Therefore, in reality, the timing is controlled so that the joint is pressed only when the finger joint 18 is within the distance _L2 .

Next, regarding the development over time when implementing the joint press timing control method, Figure 9 1-
This will be explained with reference to FIG. 9 and 11. It goes without saying that the shortest length of the piece of wood to be used in the joint press is greater than the distance _L3 from the position C to the detector 56. At the start of the finger press process, a long piece of wood 12-1 having the finger portion 14 formed at least on the rear end thereof,
The joint press apparatus shown in FIGS. 5 and 6 is fed (in this case, of course, the first and second clamping members 36, 40 are raised from the corresponding tables 30, 28). This long piece of wood 12-1 has a length that reaches at least the lower surface of the measuring roller 58 from the center line of the feed roll 50, and the piece of wood 12-1 passes through the detection head of the detector 56. By doing so, the detector is turned ON, and the control circuit shown in FIG. 7 stores a command to be joint pressed in the next step.

The long piece of wood 12-1 is fed into a feeding roll 50.
When the rear end portion comes off the roll 50 as shown in FIG. 9, it stops at that position because no feed is applied, and the detector 56 is turned off. That is, a long piece of wood 12
-1 is stopped in a state where it is placed across the fixed table 28 and the slide table 30.
Note that since the tip of the long piece of wood 12-1 comes into contact with the length measuring roller 58 during the feeding process, the tip of the long piece of wood 12-1
-1 is stopped, the length is measured by the roller 58. Here, press the reset button (not shown) to reset the preset counters C ₁ and C ₂ (described later).
is reset to zero value and the full-fledged start state of finger press processing is set.

The preset _C1 is preset with a pulse value corresponding to the distance _L1 , and the preset counter _C2 is preset with a pulse value corresponding to the distance _L2 (= _L1 - _L3 ). Assume that there is. In this state, pieces of wood 12-2, 12 of random length
-3, 12-4... are successively supplied, the detector 56 detects the arrival of the wood piece and turns ON, giving an energizing command to the cylinder 54 to lower the feeding roll 50, The subsequent piece of wood is forcibly fed in (see FIG. 9, 3).

At this time, the detector 56 is turned on by the passage of the first long piece of wood 12-1, and a command for joint pressing in the next step is stored in the control circuit shown in FIG. Then, as shown in FIG. 9, when the length measuring roller 58 rotates by a distance _L1 and the preset counter _C1 counts up,
The feeding of the second succeeding piece of wood 12-2 is stopped. Next, under the biasing action of the cylinders 38, 42, the first and second clamp members 36, 40 descend, and the leading piece of wood 12-1 and the succeeding piece of wood 12-2 are lowered.
and are correspondingly strongly pressed between the tables 30 and 28. The cylinder 34 is then energized,
horizontally move the slide table 30 to the left,
This completes the joint pressing of the finger joint.

Note that the preset counter _C2 is preset with the number of pulses corresponding to the distance _L2 , as described above. Moreover, since L ₁ >L ₂ , even though pulses are supplied by the same length measuring roller 58, the counter _C2 always counts up with priority over the counter _C1 . Moreover, since L ₂ = L ₁ − _{L 3} ,
If the detector 56 turns on or off even once until the counter _C2 counts up, the finger joint (single or multiple) will be removed during the next joint press operation.
is always located within the safe distance L ₂ ,
This means that joint press is possible.

Now, as shown in FIG. 9, it is assumed that the third succeeding piece of wood 12-3 is a short piece of wood.
At this time, the detector 56 is turned OFF due to the passage of the second preceding piece of wood 12-2.
actuated, and then this third subsequent piece of wood 12-3
By supplying the detector 5 as shown in FIG.
6 is ON. Then, the wavelength roller 58 reads that the second piece of wood 12-2 has traveled the distance _L1 , and the counter _C1 counts up accordingly. Therefore, the counter _C1 issues a joint press command to the control circuit shown in FIG. 7 to energize the cylinders 38 and 42, and as shown in FIG.
2-3 and the preceding piece of wood 12-2 on the table 30,
28. Next, the cylinder 34 is energized and the slide table 30 is fixed to the fixed table 2.
By forcing the movement toward point 8, a joint press of both pieces of wood is achieved.

Next, as shown in FIG. 9, the case where the third piece of wood 12-3 supplied is a sufficiently long piece will be described. The first piece of wood 12-1 and the second piece of wood 1
After the joint with 2-2 is made, when the third long piece of wood 12-3 is supplied, the detector 56 detects this long piece of wood 13-3 and turns on.
Also, the long piece of wood 12-3 is transported by the feeding roll 50.
is sent forward, and its front end is the second piece of wood 12
-2, the wooden piece 12-
2 is pushed forward. For this reason, the length measuring roller 58 in contact with the long piece of wood 12-2 starts measuring the wavelength, and when the third piece of wood 12-3 advances by a distance _L1 , the counter _C1 counts up and the long piece of wood 1
Stop feeding 2-3. Then, under the joint press command, the leading piece of wood 12-2 and the following long piece of wood 12-3 are jointed (9th piece of wood).
(See Figure 9).

When this joint is completed, the first and second
The clamps 36 and 40 rise to release the clamping pressure.
For this reason, the long piece of wood 12-3 is further sent forward by the feeding roll 50, but when the rear end of this long piece of wood 12-3 comes off the detector 56, the detector 56 is turned off. and reset the counter _C1 . Further, the rear end of the piece of wood 12-3 comes off from the feed roll 50, and this long piece of wood 12-3 comes to a stop. Next, FIG. 9 10
As shown in the figure, when the fourth piece of wood 12-4 (this may be short or long) is supplied after the third long piece of wood 12-3, the detector 56 is turned on. do. In addition, the feeding roll 50
The fourth piece of wood 12-4 is sent forward,
Upon contacting the rear end of the third long piece of wood 12-3, both pieces of wood are sent forward together.

When the third long piece of wood 12-3 resumes its forward movement, the length measuring roller 58 that was in contact with the third piece of wood 12-3 starts measuring its length. The measurement by the roller 58 is based on the fourth piece of wood 12 that is arriving later.
-4 length and the counting of counter _C1 is started. Then, before the counter _C1 counts up, another counter _C2 first counts up, and the fourth piece of wood 12-4
is at least greater than the distance L ₃ from said position C to the detector 56. Thereafter, when the rear end of the fourth piece of wood 12-4 exits the detection range of the detector 56 before the counter _C1 counts up, the detector 56 is turned off.
As a result, the aforementioned joint press command is issued, and the rear end of the third long piece of wood 12-3 and the rear end of the fourth piece of wood 12-4 are jointed.

Furthermore, prior to the OFF operation of the detector 56,
When the counter _C1 counts up, the feeding of the third long piece of wood 12-3 by the feeding roll 50 is stopped. At this time, due to the count up of the counter _C1 , the fourth succeeding piece of wood 12-4
It is ensured that the tip of is located in a safe area corresponding to a distance L ₁ . Then, the joint press command is issued in the same way as before, and the rear end of the third long piece of wood 12-3 and the rear end of the fourth piece of wood 12-4 are jointed (see Fig. 9, 11). ).

Effects of the Invention As explained above, according to the timing control method for a joint press and the device implementing the same according to the present invention, wood pieces having finger portions formed at both ends are randomly supplied in a mixed long and short form. However, joint pressing can only be performed when the finger joint is located within a safe range between the two clamping members, so there is no loss of time or energy in the process, and it is extremely efficient. Good puller press processing can be performed. Further, the finger joint can be either a multi-joint or a single joint, and it is suitable for small-lot production and has many beneficial effects, such as being easy to operate.

[Brief explanation of drawings]

Figures 1a to 1e are schematic illustrations of the process of fingering a defective piece of wood to extract a defect-free piece of wood; Figures 2a and 2b are illustrations of single joint and multi-joint; 5 and 4 are schematic diagrams showing the positional relationship between the finger joint and the clamp, FIG. 5 is a schematic perspective view of a finger press device capable of implementing the timing control method according to the present invention, and FIG. 7 is a block diagram showing an example of a control circuit, FIG. 8 is a schematic diagram showing the positional relationship in the device shown in FIG. 5, and FIGS. 9 1 to 9 11. teeth,
It is an explanatory view showing the positional relationship over time between a preceding piece of wood and a following piece of wood. 26...base, 28...fixed table, 30...
...Slide table, 36...First clamp member, 40...Second clamp member, 56...Detector, 58...Length measuring roller.

Claims (1)

[Claims] 1. Pieces of wood 12 each having a chevron-shaped finger portion 14 formed at its tip and rear end are continuously supplied in series,
In finger joint processing in which a joint press is performed between the preceding piece of wood 12N and the following piece of wood 12N+1 to produce the bonding material 16 glued at the finger portion 14, the following piece of wood 12N+1 is gripped. A group of pieces of wood that arrive sequentially in front of the possible first clamp 36 is detected, and while the preceding piece of wood 12N is being sent, the length of the succeeding piece of wood 12N+1 is measured, and the length of the succeeding piece of wood 12N+1 is measured. During the measurement,
The tip of this succeeding piece of wood 12N+1 exceeds the downstream end of the first clamp 36, and the following piece of wood 12N+
When the detection of 1 is completed, the subsequent wood piece 12N+1
The forwarding of the preceding piece of wood 12N and the following piece of wood 12N+1 are joint pressed, and while the length of the following piece of wood 12N+1 is being measured, the first clamp 36 and the preceding piece of wood 12N are pressed together.
The following piece of wood 12N is moved to the joint permissible limit position _L1 between the second clamp 40 that can grip the following piece of wood 12N.
If the tip of +1 arrives, the following piece of wood 12N+
1. A timing control method for a joint press, characterized in that the feeding of the preceding piece of wood 12N and the succeeding piece of wood 12N+1 are joint-pressed by stopping feeding of the preceding piece of wood 12N and the following piece of wood 12N+1. 2. A fixed table 28 provided on the base 26, and a slide table 3 provided horizontally slidably on the base 26 and moved toward and away from the fixed table 28 by being biased by a predetermined drive source 34.
0 and the following wooden pieces 12N+1 are disposed on the slide table 30 and are driven up and down by the drive source 38.
a first clamp member 36 that grips a drive source 42 disposed on the fixed table 28;
a second clamp member 40 that is driven up and down by a user to grip the preceding piece of wood 12N; a second clamp member 40 that is driven up and down by a user; a piece of wood transport means 48, 50 disposed upstream of the slide table 30; and a second clamp member 40 that is disposed close to the piece of wood transport means 48, 50. a detection means 56 for detecting the arrival of a group of wood chips, and a length measuring means 58 disposed on the fixed table 28 for measuring the sending distance of the wood chips, and a finger provided at the rear end of the preceding wood chips 12N 14 and the finger portion 14 provided at the front end of the succeeding piece of wood 12N+1 are joint pressed between the first clamp member 36 and the second clamp member 40. Control device.