JP3402714B2 - Veneer veneer stacking equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved veneer veneer stacking apparatus. 2. Description of the Related Art Conventionally, as one type of a stacking apparatus for stacking veneer veneers (hereinafter simply referred to as veneers), a veneer veneer is woven with a stabbed conveyor having a plurality of stabbing belts. There is a known type in which the sheet is continuously attached to a predetermined area by sticking in a direction perpendicular to the direction and is forcibly shot down and deposited by a shot-down mechanism having a plurality of rows of shot-down bars parallel to the transfer direction. It is suitable for processing a veneer having a long length in the fiber direction, and has the advantage of relatively efficient deposition because the veneer is processed without stopping the transportation of the veneer. [0003] However, in the above-mentioned conventional example, the deposition position of the veneer is regulated solely by using the friction between the veneer and the down bar, so that the deposition accuracy is very good. However, there is a defect that the deposition accuracy deteriorates in proportion to the increase in the transport speed. Therefore, prior to the development of the present invention, a ruler is disposed diagonally below a predetermined area where the veneer is to be dropped, and the tip of the veneer being dropped is brought into contact with the ruler.
An attempt was made to regulate the stacking position of the veneers to a substantially constant level, but as is well known, veneers have a very weak strength in the direction perpendicular to the fiber direction, so the tip of the veneer is simply brought into contact with a ruler. In such a case, a fatal phenomenon such as breakage of the front end portion or buckling of the intermediate portion is likely to occur, so that it has been difficult to put the apparatus to practical use, and it has never been possible to increase the transport speed. [0005] Then, the lowermost position (bottom dead center) of the down bar corresponding to the stabbing belt located near the center of the veneer in the fiber direction is located near both sides in the fiber direction of the veneer. The lowering position of the down bar corresponding to the stabbing belt is set further lower than the lowermost position, and by bending the veneer in a downward arch shape, the strength of the veneer in the direction orthogonal to the fiber direction of the veneer is substantially increased. An experiment was conducted in which the tip was brought into contact with a ruler.In this case, at the early stage of the shot down, first, the sticking by the sticking belt located near the center of the veneer in the fiber direction was released. Although the central portion of the veneer in the fiber direction is pushed down, the stabbing belt located near both sides of the veneer in the fiber direction firmly restrains the vicinity of both sides of the veneer in the fiber direction (sticking). The degree of bending of the veneer falls below a certain limit. Since the limited, an improvement in strength is very poor, but failed to effectively suppress the occurrence of Sakiki fatal phenomenon. The present invention is based on the above-mentioned trials and experiments, and is further improved to realize the contact of the tip of the veneer with a ruler disposed at a predetermined position, thereby restricting the deposition position to be substantially constant. Another object of the present invention is to provide a deposition apparatus capable of efficiently performing a deposition process, thereby contributing to streamlining of a veneer deposition process in a plywood factory. More specifically, as a means for solving the problem, specifically, a veneer stabbed in a direction perpendicular to the fiber direction by a stabbing conveyor having a plurality of stabbing belts. While being continuously conveyed to the area, the sheet is forcibly downed by a downing mechanism having a plurality of rows of downbars parallel to the conveying direction, and the tip of the veneer is applied to a ruler disposed diagonally below the predetermined area. A stacking device for stacking in contact with each other, wherein the lowermost position of the down bar corresponding to the stabbing belt located near both sides in the fiber direction of the veneer is located near the center of the veneer in the fiber direction. The present invention proposes a stacking device which is set further lower than the lowermost position of the down bar corresponding to the stab belt. According to the stacking apparatus having the above-described structure, the veneer in the course of falling is curved in an upward arch shape following the difference in the lowermost position of the downhill bar. In a state where the strength in the direction perpendicular to the fiber direction is substantially improved,
Since the tip abuts the ruler, the tip may be damaged,
Alternatively, the occurrence of a fatal phenomenon such as buckling of the intermediate portion is suppressed, and the material is deposited at a substantially constant deposition position based on a ruler. In addition, since the occurrence of fatal phenomena is suppressed,
Even if the transport speed is increased, the deposition processing can be performed efficiently without any problem. It should be noted that what is to be noted here is the bending direction of the veneer. In the present invention, since the veneer has a configuration in which the veneer is bent in an upward arch shape as described above, in other words, Since the stabbing by the stabbing belt located near both sides in the fiber direction of the veneer is adopted first, unlike the previous experiment, the stabbing located near the both sides in the fiber direction of the veneer There is no fear that the stab by the belt restricts the degree of bending of the veneer,
If necessary, the veneer can be considerably significantly curved, so that the strength can be improved more remarkably as compared to the above experiment, and it is extremely effective in preventing the occurrence of the fatal phenomenon described above. It is. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the drawings. A control system for controlling the operation of each device constituting the apparatus takes a special form. It is not a thing, it can be in a very ordinary form, so for convenience,
Illustration is omitted. FIG. 1 is a schematic plan view of a veneer stacking apparatus according to the present invention, FIG. 2 is a schematic side view of a veneer stacking apparatus exemplified in FIG. 1, and FIG. FIG. 4 is a partially enlarged cross-sectional explanatory view taken along the line AA, and FIG. 4 is a back-side operation explanatory view of the single-plate deposition and deposition apparatus illustrated in FIGS. 1 to 3. In the drawing, reference numeral 1 denotes a stabbing conveyor for transporting the veneer 5 in a direction orthogonal to the fiber direction. Puncture belt 1b, pulley 1 located near the center in the fiber direction
c, a drive shaft 1d, a belt guide 1e, etc., and is driven by a drive source (not shown) such as a motor.
The veneer 5 is driven at a high speed in the direction of the arrow shown in the figure, and continuously transports the veneer 5 stabbed from the upper surface side to a predetermined area where the stab is to be opened at the stab at the stab before the stacking measure. Reference numeral 2 denotes a striking mechanism for striking the veneer 5 obliquely downward. The striking bar 2a corresponding to the stab belt 1a located near both sides in the fiber direction of the veneer 5, and the veneer 5 A down bar 2b, a connecting arm 2c, a rotating arm 2d corresponding to the stabbing belt 1b located near the center in the fiber direction of
A single plate detector (not shown) configured to detect the arrival of the single plate 5 at a predetermined area via the stab conveyor 1 or a transfer from the stab site. Based on a start signal from an encoder (not shown) or the like for measuring the distance, the drive of a drive source (not shown) such as a servomotor, a clutch and a motor with a brake is obtained, and the drive is performed intermittently, and the veneer 5 is operated in a predetermined manner. Forcibly release the stab and drop obliquely downward each time it reaches the area. However, as is clear from FIGS. 2 and 4,
The drop-down mechanism 2 changes the length of the corresponding connecting arm 2c so that the lowest position of the drop-down bar 2a corresponding to the stabbing belt 1a located near both sides in the fiber direction of the veneer 5 can be determined. The lowering position of the down bar 2b corresponding to the stab belt 1b located near the center of the veneer 5 in the fiber direction is set to be lower than the lowest position. Reference numeral 3 denotes a ruler for regulating the stacking position of the veneer 5, which is constituted by a ruler plate 3a and a support beam 3b fixed to a machine frame (not shown) or the like. 2, the stacking position of the veneer 5 is regulated to be substantially constant. Reference numeral 4 denotes an ascending / descending stacking table. At the start of the stacking, the height of the uppermost surface of the stacking table 4 (or the uppermost surface of the stacking plate, if necessary, when the stacking plate is used) is set. After the start, a controller (not shown) based on a start signal from a height detector (not shown) for detecting the height of the uppermost surface of the pile 5a of the veneer deposited on the deposition table 4 or the like. With such control, the veneers 5 that are sequentially falling are always received at a substantially constant height. The stacking apparatus according to the present invention is configured as described above, for example, and the veneer 5 carried into the predetermined area by the stab conveyor 1 is forcibly dropped by the dropping mechanism 2. Dropping obliquely downward with kinetic energy (inertia), but eventually the tip comes into contact with the ruler 3 and stalls, so that it is sequentially deposited at a substantially constant deposition position based on the ruler 3. Become. In this case, as shown in FIG. 4, the veneer 5 in the process of falling is curved in an upward arch shape following the difference between the lowermost positions of the down-strength bars 2a and 2b. Since the strength in the orthogonal direction is substantially improved, and the tip comes into contact with the ruler 3, the occurrence of a fatal phenomenon such as damage to the desired tip or buckling of the middle part is suppressed. Will be done. In addition, since the occurrence of fatal phenomena is suppressed, there is no problem even if the transport speed is increased,
The deposition process can be performed efficiently. In the deposition apparatus according to the present invention,
The stabbing by the stabbing belts located in the vicinity of both sides of the veneer in the fiber direction does not limit the degree of bending of the veneer. It is as follows. However, excessive curving is likely to hinder stable settling of the veneer (to the stacking position), so it should be avoided, and the preferable degree of curving is desirably selected based on experiments. In the above-described embodiment, the number of the stabbing belts located near the center of the veneer in the fiber direction is set to two. However, it is not necessary to limit the number to two. Even if there are three or more strips, it suffices that at least one strip besides the stab belts located near both sides in the fiber direction of the veneer. In the above embodiment, the number of stab belts and the number (rows) of downing bars are the same, but the number is not necessarily limited to the same number. If the interval between the two embroidery belts located near the center in the direction is narrow, it is sufficient to provide a row of downhill bars in the middle of the embroidery belt, or, if necessary, the left and right sides of the desired embroidery belt. It is permissible to provide a row of downing bars on both sides, one on each side. In short, there is no problem as long as the perforated belt can be easily released for each perforated belt. In the above-described embodiment, the swing-down type drop-down mechanism is used, and the length of the connecting arm is changed appropriately for each position so that the lowermost position of the drop-down bar is changed for each desired position. However, even if the same type of down mechanism is used, for example, if the arrangement height of the drive shaft is different for each location as appropriate, even if the lengths of all the connecting arms are made the same, In the same manner as in the above embodiment, the lowermost position of the down bar can be made different, so that the same setting can be performed by another form, or for example, a vertical track type, etc. The same setting can be carried out by using a down mechanism of the form of the type, in short, the lowermost position of the down bar corresponding to the stabbing belt located near both sides in the fiber direction of the veneer, Corresponds to the stab belt located near the center of the veneer in the fiber direction. Shoot down further only necessary Ere set down as compared to the lowest position of the bar, there is no particular limitation on the form of the shoot down mechanism itself. In the above-described embodiment, a fixed ruler is used. In addition, a movable or semi-movable ruler according to the present application as described later can also be used. In addition, since the impact caused by the contact between the tip of the veneer and the ruler can be appropriately buffered, it is more effective, and the usefulness of the device is further improved. That is, although not shown in the drawings, the type disclosed in “Method of restricting the drop position in a veneer veneer stacking device” (Japanese Patent Application No. 5-254856) filed by the present applicant is a predetermined type. The ruler to be installed at the place is divided into a plurality of pieces in the direction of transport of the veneer, the weight of each piece is reduced, the pieces are individually slidably supported, and the rulers are spaced from each other at appropriate intervals. The state having the buffer space described above is regarded as the original state, and each ruler is repeatedly returned to the same state each time before the abutment of the veneer. [0025] On the other hand, although not shown in the drawings, "a device for regulating the tip end deposition position in a thin plate deposition machine" according to the application filed on November 25, 1993 (Japanese Patent Laid-Open No. 7-144813)
In the type disclosed in Japanese Patent Application Laid- Open Publication No. H10-260, a fixed ruler is provided at a predetermined location, and the fixed ruler is usually located at a standby position on the upper side in the veneer transport direction with respect to the fixed ruler. With the contact, the movable ruler which retreats to the rear of the fixed ruler is provided in duplicate, and prior to the contact of the veneer, the movable ruler is repeated every time to the same standby position. It is configured to return. If a movable (former) or semi-movable (latter) ruler as described above is used, the veneer transfers a part of its kinetic energy to the ruler that comes in contact with the ruler first, and enters the deceleration state. And indirectly (the former) or directly (the latter) in contact with the ruler at the rear position (lower side in the direction of transport of the veneer), directly to the fixed ruler as exemplified in the above embodiment. As compared with the case of the contact, the impact caused by the contact is considerably buffered, and the occurrence of the fatal phenomenon is more accurately suppressed, so that the usefulness of the apparatus is further improved. Furthermore, no matter which type of ruler is used, for example, if a crack already exists at the tip of a veneer,
Due to various factors, such as relatively little improvement in strength due to bending, the tip of the veneer is rarely half buckled and caught on the ruler, but if it does, it will deposit at least immediately after that Although the normal contact of the veneer with the ruler is hindered, or the veneer rebounds excessively, the deposition accuracy may be significantly deteriorated. There is a veneer guide on the opposite side of the ruler with a sufficient margin compared to that of the veneer to guide the fall position of the rear end of the veneer, and it is also possible to regulate the accumulation accuracy so that it does not deteriorate beyond a certain limit. Practically useful. As is apparent from the above, according to the deposition apparatus of the present invention, the strength of the veneer is originally curved, but the strength in the direction orthogonal to the fiber direction is extremely weak. In a substantially improved state, the tip can be brought into contact with a ruler, and as a result, the occurrence of fatal phenomena such as damage to the tip or buckling of the middle part is suppressed. In addition, since the deposition can be efficiently and accurately performed, the effect of the present invention in the single-plate deposition process is extremely large.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan explanatory view of a veneer deposition apparatus according to the present invention. FIG. 2 is a schematic side view illustrating the single-plate deposition apparatus illustrated in FIG. 1; FIG. 3 is a partially enlarged sectional explanatory view taken along line AA in FIG. 1; FIG. 4 is an explanatory view of the back surface operation of the single-plate deposition and deposition apparatus illustrated in FIGS. 1 to 3; [Explanation of Signs] 1: Sticking conveyor 2: Down mechanism 3: Ruler 4: Stacking table

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-318410 (JP, A) JP-A-5-169404 (JP, A) JP-A-5-50404 (JP, A) 79473 (JP, A) Fully open 1987-6-183659 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27D 1/00-3/04 B65H 29/00-29/10 B65H 29/26-29/30 B65H 29/34-29/51

Claims (1)

(57) [Claim 1] A veneer veneer stabbed in a direction perpendicular to the fiber direction is continuously conveyed to a predetermined area by a stab conveyor having a plurality of stab belts. This is a stacking device that is forcibly shot down by a shot-down mechanism having a multi-row-shaped shot-down bar parallel to the transport direction, and the tip of a veneer veneer is brought into contact with a ruler disposed diagonally below a predetermined area to deposit. So,
The lowering position of the downstroke bar corresponding to the stabbing belt located near both sides of the veneer veneer in the fiber direction is the downstroke bar corresponding to the stabbing belt located near the center of the veneer veneer in the fiber direction. A veneer veneer stacking apparatus, wherein the veneer veneer is set one step lower than the lowest position.