JPH0472682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The method of the present invention relates to a method for cutting cross-seam veneers used for plywood.

[Prior art]

To obtain a fixed-length cross-cut veneer, first cut the raw wood with a rotary lace and cut the cut-out veneer x
(The reference numerals in the drawings are used, the same applies hereinafter) is dried with a roll dryer, the front and rear edges or defective parts are removed by a horizontal stripping device 2, and the front and rear ends of this sized veneer x are attached, By connecting the veneers L with an adhesive, adhesive thread, adhesive tape, etc., and cutting the connected veneers L into a fixed size, a veneer A with a fixed length is obtained.

Sized veneer x is used after drying, but depending on the tree species, or even if it is cut from a single log,
Due to differences in specific gravity and moisture content between the skin and core,
The finished moisture content is different.

Generally, the standard-length cross-splitting veneer a, which is obtained by connecting a horizontal splinter and cutting it to a certain size, is connected with a mixed sized veneer x having a low moisture content or a high moisture content. and becomes a semi-finished product. For this reason, when the cut standard-length cross-splitting veneer a containing the sized veneer x with a high moisture content is re-dried, it becomes shorter than the standard size. Therefore, the moisture content of the sized veneer x carried into the horizontal stripping device 2 is detected, and the sized veneer x with a high moisture content is removed on the upstream side of the horizontal stripping device 2. Only the veneer x was being carried into the horizontal stripping device 2.

After the removed sized veneer x is re-dried, it is transported to the horizontal stripping device 2.

However, in such a method, the horizontal stripping device 2 is filled with sized veneer x intermittently,
The filling efficiency will be significantly reduced.

It is an object of the present invention to solve the problems of the conventional method for manufacturing half-finished products of horizontally spliced veneers.

That is, the method of the present invention continuously detects the moisture content of each sized veneer x of the connected horizontal splintering veneers L detected by the horizontal splintering device 2, and integrates the continuously detected moisture contents. In other words, the cutting length of the connected horizontally spliced veneer L is determined based on the length of the high moisture content part and the integrated value of the height of the high moisture content in that part, and the cutting length of the connected horizontally spun veneer L is determined based on the length of the high moisture content part and the integrated value of the height of the high moisture content in that part. It is designed to stack veneer a of shaku horizontal strips. With the present invention having such a configuration, the standard-length cross-splitting veneer a cut into a length according to the calculated integrated value of the length and height of the moisture content is shrunk in the stacking device 4,
It becomes a horizontally spliced veneer a with a fixed size, and when manufacturing plywood, it becomes a horizontally spliced veneer with a specified moisture content and a specified size. Therefore, in the method of the present invention, there is no need to re-dry the sized veneer x with a high moisture content, and the cross-splitting device 2 is always filled with the sized veneer x, allowing for highly workable cross-splitting veneer cutting. provided a method.

[Explanation of Examples]

Examples of the method of the present invention will be described below.

First, for convenience of explanation, the "integrated value" will be explained.

In the present invention, the sum of the length of the high water content portion during the constant speed conveyance time T in FIG. 5 and the height of the high water content of that portion is referred to as an "integrated value."

A "set value" is set in advance for this integrated value, and the cutting length is determined depending on whether the horizontally spun veneer being conveyed exceeds or does not exceed this moisture content set value.

Whether or not this “integrated value” exceeds the set value is determined by the fifth
It is determined as shown in the figure.

Figure 5 shows a case where the constant speed conveyance time required for the connected horizontally spliced veneers L to be conveyed at a constant speed by the specified length cutting width l is T, and the integrated value is detected in this constant speed conveyance time T. It shows.

In Fig. 5, T...constant speed conveyance time, V...moisture content,...first stage of high moisture content height,...second stage of high moisture content height, x%...actual moisture content of the veneer, y%
...actual moisture content of veneer, t ₁ , t ₂ , t ₃ ...first stage 1
transport time, _tA ... transport time of the second stage 2, the veneer whose integrated value is now measured shows a moisture content x% at transport times _t1 , _t2 , _t3, as shown in Figure 5. , it is assumed that the moisture content is y% at the transport time _tA . Then, x% belongs to the first stage of moisture content,
y% belongs to the second stage of moisture content.

That is, the height time of the first stage of high moisture content t ₁ +t ₂ +t ₃ ,
At the time t _A of the height portion of the second stage of high moisture content, the set value is now t×Z.

If (t ₁ +t ₂ +t ₃ )×1+t _A ×2<t×Z, the cutting width is set to the standard size l.

If (t ₁ +t ₂ +t ₃ )×1+t _A ×2<t×Z, the cutting width is set to be larger than the standard size (l+α).

Details of determining these cutting widths will be described later.

[Description of the apparatus for carrying out the method of the present invention]

In the drawings, reference numeral 1 denotes a conveyor, which carries dried sized veneer x into a cross-splitting device 2. 2 is a horizontal stripping device, which cuts and removes the front and rear edges or defective parts of the brought-in sized veneer , the sized veneers x are connected to obtain a connected horizontally spliced veneer L.

Reference numeral 3a denotes a first interleaving driven veneer for carrying out the connected cross-splitting veneer L sent out from the cross-splitting device 2.
This is an unloading conveyor.

Reference numeral 3b denotes a second carrying-out conveyor that is continuously driven to carry out the fixed-length cross-cut veneer a cut to a fixed length by the cutting device 8.

4 is a stacking device that stacks the standard-length cross-splitting veneers a that have been cut to a specified length, and separates and stacks the horizontal-splitting veneers a that are within the set value and the standard-length cross-splitting veneers a that exceed the set value. take. 5 is a moisture content detector located on the downstream side of the horizontal splintering device 2, which detects the "integrated value" of each sized veneer x of the connected horizontal spliced veneers, and detects changes in the "integrated value". emits an output signal according to the Reference numeral 6 denotes a regular cutting control computer, which receives the output signal from the moisture content detector 5 and detects high moisture content exceeding a set value among the integrated values of each sized veneer x of the connected horizontally spun veneers L. Integrate the length of the ratio part and the height of the high moisture content, and check whether the integrated value of the moisture content per standard length cutting dimension is within the range of the preset value per standard length cutting dimension. , or whether it exceeds the set value. If the set value is exceeded, the fixed length cutting command device 7 is switched depending on the range in which the set value is exceeded. 7 is a fixed length cutting command device which receives a signal from the fixed length cutting control computer 6, detects the front edge of the connected horizontally spliced veneer L being conveyed, and sends an operation signal for the fixed length cutting width to the cutting device. Send to 8. Reference numeral 8 denotes a cutting device which receives an activation signal from the fixed length cutting command device 7 and cuts the connected horizontally spun veneers L to a fixed length.

[Explanation of action]

Next, the operation of the method of the present invention will be explained.

The dried sized veneer is conveyed to a cross-splitting device 2 by a conveyor 1 while being moved. The sized veneer is conveyed intermittently, and after cutting and removing the front and rear edges or defective parts,
The front and rear single edges are butted together, and the sized veneers x are connected by a conventional method such as adhesive, adhesive, adhesive tape, etc., to obtain a connected horizontally-separated veneer L.

The connected horizontally spun veneers L are conveyed by an intermittent-driven transport conveyor 3a provided on the downstream side of the horizontally spliced veneer 2, and each of the jointed horizontally spun veneers L is conveyed by a moisture content detector 5. The moisture content of the sized veneer x is continuously detected. Then, the output of the detected moisture content is sent to the regular length cutting control computer 6.

The regular length cutting control computer 6 receives the output signal from the moisture content detector 5, and cuts each cut veneer x
From the length and height of the moisture content, calculate the integrated value of the moisture content per standard length cutting dimension 1, and check whether this "integrated value" is within the range of the preset value per standard length cutting dimension 1. Or judge whether it exceeds the set value.

If the set value is exceeded, the standard length cutting command device 7 and the stacking position of the stacking device 4 are switched depending on the extent to which the set value is exceeded.

The connected horizontally spun veneers L are conveyed while their moisture content is detected, and reach the fixed length cutting command device 7, and the device 7 detects the leading edge of the veneer L. At the same time, or after a certain period of time, The device 7 issues an activation signal, operates the cutting device 8, and cuts the connected horizontally spliced veneer L to a specified length.

The fixed length cutting command device 7 has its detection position switched to an appropriate position by the fixed length cutting control computer 6 in advance, and the fixed length cutting command device 7 has its detection position switched to an appropriate position in advance by the fixed length cutting control computer 6. If the "accumulated moisture content value per standard length cutting dimension" calculated from the length and height of the moisture content is within the set value, it is cut to a standard length cutting width.

On the other hand, if the integrated value exceeds the set value, the value exceeding the set value is divided into several stages, and each of the divided stages S ₁ , S ₂ , S ₃ , S ₄
According to the standard cutting width l, the material is cut in several stages as appropriate. In reality, as shown in the figure, the standard length cutting command device 7 divides the extent to which the integrated value exceeds the set value into five stages, for example, S ₁ , S ₂ , S ₃ , S ₄ , and S ₅ . Move the position to detect the tip of the side-splitting veneer L, and cut the side-splitting veneer L that exceeds the set value into 5 lengths according to the S ₁ range, S ₃ range, etc. do. The cutting method will be described later.

In the explanation of 3 above, the case where the detection position of the fixed length cutting command device 7 can be switched to an appropriate position by the fixed length cutting control computer 6 has been explained, but conversely, the detection position of the fixed length cutting command device 7 may be kept constant, and the time for issuing the cutting operation signal to the cutting device 8 may be varied.

The cut cross-splitting veneer a is carried into a stacking device 4 by a continuously driven carrying-out conveyor 3b.

In the stacking device 4, the output signal from the regular length cutting control computer 6 is received, and the stacking positions y ₁ , y ₂ , y ₃ . Then, the side-splitting veneers a are sorted into predetermined stacking positions y ₁ , y ₂ , y ₃ . . . and stacked.

The stacked regular-length cross-splitting veneers a with a high moisture content are dried and shrunk while being left in a stacking device, and become regular-length horizontal splinter veneers a with specified dimensions.

The operation of the method of the present invention is explained in a skeleton manner in FIGS. 3 and 4.

Figures 3 and 4 are shown in order to avoid complicating the explanation.
The case where the moisture content is simply sorted into those whose moisture content does not exceed the set value and those whose moisture content exceeds the set value is described.

As shown in FIGS. 3 and 4, the method of the present invention divides numerical values exceeding the set value into several stages S ₁ , S ₂ , S ₃ . . . It is designed to cut a veneer L.
For example, in FIGS. 3 and 4, the cutting widths according to the present invention are l, l+α, l+2α, l+3α,
They are sorted into several types, such as ..., and loaded into the loading docks y ₁ , y ₂ , y ₃ , y ₄ , etc. of the loading device 4, respectively.

That is, FIG. 3 shows the operating state when the set value is not exceeded.

In the state shown in FIG. 3a, the moisture content detector 5 starts detecting the moisture content from the tip of the connected horizontally spliced veneer L.

In the state shown in FIG. 3b, the detection of the moisture content of the connected horizontally spliced veneer L for the specified cutting width l is completed.

At this time, the fixed-length cutting command device 7 is at a position where the continuous cross-splitting veneer L is to be cut into a fixed-length cutting width l.

In Fig. 3c, when the leading end of the connected horizontally spun veneer L reaches the standard length cutting command device 7, the cutting device 8 cuts the connected horizontally spliced veneer L to a specified length according to a command from the standard length cutting control computer 6. The veneer is cut into pieces and stacked at the veneer stacking position y ₁ within the set value.

Next, FIG. 4 shows the operating state when the connected horizontal splinter veneer L exceeds the set value.

FIG. 4a shows the state when the tip of the connected horizontally spliced veneer L reaches the moisture content detector 5 and starts detecting the moisture content.

Fig. 4b shows that the detection of the moisture content of the standard cutting width l of the horizontally spun veneer L has been completed, and it has been detected that the integrated value calculated from the length and height of the moisture content has exceeded the set value. do. Then, in response to a command from the fixed length cutting control computer 6, the fixed length cutting command device 7 moves by, for example, α from the position indicated by the dotted line to the position indicated by the solid line.

At the same time, the switching device 4a of the stacking device 4 is also switched toward the high moisture content veneer loading area in response to a command from the regular length cutting control computer 6.

Further, a command to delay the next moisture content detection start point of the moisture content detector 5 from _P1 to _P2 is issued from the regular length cutting control computer 6. This is because unless the moisture content detection point is delayed until the next detection, the moisture content cannot be integrated with respect to the standard cutting width l.

In Fig. 4c, the tip of the side-splitting veneer L reaches the fixed-length cutting command device 7, which has moved by a distance α, and the cutting device 8 moves the side-splitting veneer L to the cutting width l+α according to the command from the fixed-length cutting control computer 6. Shows the cut state.

The horizontally spun veneer a cut to a cutting width l+α is loaded into a high moisture content loading area via a switching device 4a.

In the above cutting method, if the integrated value exceeds the set value, it is calculated for the moisture content in the veneer with the standard cutting width l, and is not calculated for the moisture content in the veneer with the actual cutting width l+α. Therefore, a certain amount of error occurs, but as a practical matter, it is irreversible in determining whether or not the set value has been exceeded.

As described above, the moisture content detector 5 starts detecting the moisture content again from point _P1 of the connected horizontally spliced veneer L, and repeats the same operation thereafter.

In the following explanation, in order to make it easier to understand the effect of the cutting method, the apparatus is installed such that the distance between the regular length cutting command device 7 and the cutting device 8 is the same as the regular length cutting width l. However, in reality, the distance between the standard length cutting command device 7 and the cutting device 8 can be set shorter than l.

For example, when the distance between the two is set at (l-β), when the standard-length cutting command device 7 detects the tip of the connected cross-splitting veneer L and simultaneously operates the cutting device 8, the cut standard-length cross-splitting veneer The dimensions of plate a are (l-
β), and becomes shorter by the dimension β. Therefore, from the operation timing (at the same time as the tip is detected/after a certain period of time has elapsed since the tip is detected) when the distance between the standard length cutting command device 7 and the cutting device 8 is set at l, it is possible to By always delaying the operation of the cutting device 8 by the time required for the plate L to move by the dimension β, the cutting device 8 can be cut to a standard length l or longer (l
+α) can be cut.

[Effects of the present invention] Since the cutting width is changed according to the integrated value calculated from the length and height of the moisture content of the connected horizontally spliced veneers L, the cutting width becomes the standard length after stacking, and plywood can be laminated as is. It can be used for.

Furthermore, the yield rate during plywood production does not decrease.

The regular length cutting control computer 6 stores the numerical value exceeding the set value of the integrated value calculated from the length and height of the moisture content of the connected jointed cross-cut veneer L, dividing it into several stages in order of magnitude, and storing the numerical value in the several stages. Since the cutting width is set in several stages corresponding to the cumulative value of the moisture content divided into the following, it is possible to accurately shrink while being left in the stacking device 4, and to obtain horizontally spun veneer a with specified dimensions and specified moisture content. .

[Brief explanation of the drawing]

Figure 1: Explanatory diagram of the process of the method of the present invention, Figure 2: Perspective view of fixed-length cross-splitting veneer a, Figure 3.
, Fig. 4, , : Skeleton type explanatory diagram of the method of the present invention, Fig. 5: Explanatory diagram of the method of detecting the integrated value of moisture content, 1: Carrying-in conveyor, 2: Side stripping device, 3a:
1st unloading conveyor, 3b: 2nd unloading conveyor, 4: Loading device, 5: Moisture content detector, 6: Standard length cutting control computer, 7: Standard length cutting command device, 8: Cutting device, a: Cutting Horizontal veneer,
x: sized veneer, y ₁ , y ₂ , y ₃ : loading position, L: connected horizontally spun veneer, a: regular length horizontally spliced veneer, T: constant speed conveyance time, V: moisture content.

Claims (1)

[Scope of Claims] 1. A carry-in conveyor 1 that carries the sized veneer x into the cross-splitting device 2, and a lateral unit that joins the sized veneer x from the carry-in conveyor 1 to obtain a connected cross-split veneer L. Stripping device 2
A first carry-out conveyor 3a for carrying out the connected horizontally spun veneers L; A cutting device 8 located downstream of the first carrying-out conveyor 3a; A cutting device 8 for carrying out the horizontally spliced veneer a cut by the cutting device 8. a second carrying-out conveyor 3b; a loading device 4 for stacking the cut cross-stitched veneers a carried out from the second carrying-out conveyor 3b; and a water-containing side-splitting veneer L connected to the first carrying-out conveyor 3a. Based on the moisture content detector 5 that continuously detects the moisture content and the moisture content signal sent from the moisture content detector 5, an integrated value is calculated from the moisture content height and length of the side-splitting veneer L, and the integrated value is calculated in advance. A fixed-length cutting control computer 6 that judges whether or not the set value has been exceeded and determines the cutting width; and a fixed-length cutter that detects the tip of the side-splitting veneer L connected on the second carry-out conveyor 3b. Using a cutting device for side-splitting veneers consisting of a command device 7, the standard-length cutting control computer 6 determines the standard length of the connected horizontal-splitting veneers L based on the moisture content continuously detected by the moisture content detector 5. An integrated value is calculated from the height of moisture content and length within the cutting dimension l, and if this integrated value does not exceed the preset value, the standard cutting width l is calculated.
When the integrated value exceeds a preset value, the cutting dimensions are determined so that the cutting is performed to a length (l+α) longer than the standard cutting width l, and when cutting to the standard cutting width l, the standard cutting width is By operating the cutting device 8 at the same time as the cutting command device 7 detects the tip of the connected horizontally spun veneer L,
When cutting the connected horizontally spun veneer L to a standard length cutting dimension l, and cut it to a length (l+α) longer than the standard cutting width l, the standard length cutting command device 7 cuts the connected horizontally spliced veneer L. The cutting device 8 is operated after a certain period of time after detecting the tip of the veneer L, or the cutting device 8 is operated at the same time as the tip of the horizontally spliced veneer L is detected at the moved position by moving the fixed length cutting command device 7. A method for cutting horizontally spliced veneer, characterized in that the veneer is cut into a length (l+α) longer than the standard cutting dimension l.