JPH0464843B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves rotating a wood log, which is a raw material, by holding its left and right end faces with a spindle, and cutting a long cutting tool over the entire length of the log into a predetermined amount on the outer circumferential surface of the log. Veneer lace is used to turn a wide sheet of veneer veneer by cutting the veneer, and the so-called veneer curling phenomenon, in which the veneer warps upward due to the influence of pressure, is known as veneer cutting using veneer lace. It relates to a parallel removal device.

Traditionally, veneer veneers produced by cutting with veneer lace tend to crack on the back side of the veneer due to bending stress during cutting, and at the same time curl upwards in an arched manner. After the process of cutting veneer veneer with veneer lace, it was conveyed in a meandering manner in various devices such as stackers, clippers, edge gluers, etc., and it got stuck around the cutting blades, hindering various operations and making it extremely difficult to directly connect production lines to automation. In order to flatten these curled veneers, for example, an independent tenderizing device can be directly connected to the veneer lace to forcibly straighten the veneer's curves, or various techniques can be used that incorporate a curl removal device into the veneer lace itself. Many of these techniques, however, obtain a tenderizing effect by forcibly transporting the veneer using a rotating body with sharp protrusions on the outer circumferential surface. There is an extremely high probability that the board itself will receive many punctures from the punctured object, and puncture marks will remain on the veneer.As a result, the manufactured product will be a defective veneer, and the grade of the product will drop significantly, resulting in an extremely disadvantageous situation. It was hot.

The present invention eliminates the adverse effects caused by the punctures and makes it possible to cut flat, high-quality veneer veneers. The present invention includes a veneer cutting blade required for conventional veneer lace, a pressure bar that sets the gap between the blade openings (between the cutting edge of the blade and the log pressing point of the pressure bar) in accordance with the thickness of the veneer to be cut, as well as a pressure bar.
A plurality of disc-shaped roller disks having flat outer peripheral surfaces and rotating at an outer peripheral speed faster than the outer peripheral speed of the raw wood are brought into pressure contact with the outer peripheral surface of the raw wood slightly above the point where the pressure bar presses the raw wood in the rotational direction of the raw wood. In addition, a plurality of pressure rollers made of mini-bearings or the like and rotating eccentrically or having irregularities on the outer circumferential surface are arranged below the roller disk, and mini-bearings or the like are similarly arranged in correspondence with the pressure rollers. The present invention is characterized in that a plurality of guide rollers constructed of the above are arranged near the lower surface of the pressure bar body.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional side view of the main part of the veneer lace veneer cutting according to the present invention. Reference numeral 1 denotes a raw wood to be cut, which is the raw material for the veneer V. Normally, its left and right butt ends are held between left and right spindles (not shown) and rotated in the direction of arrow A. Reference numeral 11 denotes a plane stand, a part of which is shown at its upper end.A plane stand generally has a triangular cross section and is arranged so that its base is located downward. Reference numeral 12 denotes a knife for cutting a veneer from log 1, and the blade is held at a predetermined position on the front surface of the planer stand (the side facing log 1) with the cutting edge facing upward, using a hydraulic clamp, for example, so that the cutting edge line is parallel to the axis of log 1. It is kept tight so that it is kept tight. Reference numeral 13 denotes a base, which is usually made of a material such as stainless steel, and is attached to the entire widthwise direction (longitudinal direction of the raw wood) of the plane stand so that it becomes the mounting surface for the blade on the plane stand 11.The upper part of the base 13 is as shown in the figure. The tip is configured with an acute angle,
Its starting end is formed into an arc or an inclined surface from a position slightly shifted in the veneer traveling direction from the cutting edge of the cutter 12, and serves as a veneer guide surface 13G. A pressure roller 14 is disposed near the end of the guide surface 13G of the base 13, and is thin and can freely rotate using, for example, a mini bearing.

To explain the arrangement of the pressure rollers in detail, a plurality of narrow pressure rollers are arranged in the width direction of the planer stand 11 (raw wood 1
The pressure member 16 is arranged linearly or substantially linearly over the entire area (longitudinal direction) with separate rotation axes parallel to the cutting edge line of the cutter, and is further constituted by a spring or a fluid cylinder, etc. The pressure roller 14 expands and contracts in the direction of the arrow E and is constantly pressed into contact with the outer peripheral surface of a roller disk 23, which will be described later, either directly or indirectly through a single plate, and rotates in the direction of the arrow C. Therefore, the pressure roller 14 The arrangement in the width direction of the planer stand is also arranged at the same position as the roller disk 23 as shown in FIG. 5 (X arrow view in FIG. 1 or 2), but other embodiments As shown in FIG. 6 (X arrow view in FIG. 1 or 2), the roller disk is placed in a position that is past the roller disk, and the roller disk is indirectly attached to the disk through the veneer V to be cut. There is also a pressure contact arrangement, in which case the so-called veneer V is regarded as a driving conveyor belt and the pressure roller is driven to rotate. Furthermore, in response to changes in the species of the raw wood, the width of the cut veneer, etc., the middle part or the vicinity of the left and right ends of the plane stand may be thinned out as appropriate in the widthwise arrangement of the planer stand. , using a pressure member such as a fluid cylinder, or omitting the pressure member and coating the outer peripheral surface of the roller with an elastic body such as rubber so that the pressure roller itself has a pressure buffering effect, or applying pressure. The contact friction between the roller and the veneer may be increased.

A major feature of the pressure roller is that the roller rotates eccentrically or that the outer peripheral surface of the roller is provided with an uneven portion. In other words, the rotating shaft that supports the pressure roller rotates eccentrically like a crankshaft, or the shaft is inserted into an eccentric position of the roller itself like the pressure roller shown in FIG. Therefore, the pressure roller is rotated eccentrically from the position of the solid line to the position of the imaginary line shown in FIG. As shown in the partially enlarged view of FIG. 4, the eccentric rotational movement of the pressure roller is caused by the pressure roller 14 being moved around a guide roller 25 (described later) installed near the lower surface of the pressure bar body facing the pressure roller. In the closest state, the veneer V shows the sharpest bending action in the opposite direction to the curl of the cut veneer, as shown by the solid line V.
On the other hand, in the state shown by the imaginary line at the farthest distance from the pressure roller, the veneer V' passes through the wide open passage without being subjected to the above-mentioned bending action. The eccentric rotational movement of the pressure roller freely rotates eccentrically in the width direction of the planer head, that is, in the width direction of the strip-shaped veneer to be cut, so that the produced veneer has short small cracks in the width direction over the entire area. Therefore, the curled and curved veneer is transformed into a smooth, flat and supple veneer due to the minute cracks. Incidentally, a device in which the pressure roller 14 does not rotate eccentrically, for example, a patent application filed by the present applicant in 1983-
In No. 171876 (device for removing curls from veneer laces), curled veneers are simultaneously subjected to a bending action in the width direction in the opposite direction to curling when passing between a pressure roller and a guide roller. , due to the pressure rollers and guide rollers that are arranged perpendicular to the conveyance direction of the veneer, that is, in a straight line in the direction of the wood fibers of the veneer, relatively long large cracks are constantly formed along the fiber direction, resulting in the veneer being cracked. In the drying process after the stripping process using the lace, the cracks widen to cover the entire width of the veneer, causing cracks in the veneer and reducing the veneer yield.

Looking back at the present invention, it is similar to the above invention in that it cracks along the direction of the wood fibers, but because of the small cracks that are short in the width direction, the veneer is flat and supple, but even after drying, the cracks It is extremely rare for the wires to connect, and the problems caused by cracks and the like mentioned above can be eliminated. Furthermore, Figure 7A
In addition to providing an eccentric rotation shaft insertion hole in the pressure roller itself, as shown in FIG. , an oval roller with two uneven parts for separation (B in the same figure), a heart cam type D, a wiper cam type E, and a jumping cam type F
When rotating the pressure roller, rotate the E-type and F-type rollers in the clockwise direction in FIG. protrusion T
This gives a hooking effect to the veneer, making it possible to increase the depth of small cracks. Furthermore, Figure 7 A~
In the D-shaped roller, if necessary, the outer peripheral surface of the roller may be coated with an elastic body such as rubber to increase the contact friction with the veneer. Reference numeral 15 denotes a mounting bracket for the pressure roller 14, which has a built-in pressure member such as a spring or a fluid cylinder, or is a bracket for mounting the pressure roller on the planer stand 11 with the pressure member interposed therebetween. The relationship between the pressure rollers and the pressure member is as shown in FIG. Each may be independently expandable and contractible in the direction of arrow E using separate pressure members and brackets. Further, the expansion and contraction action is achieved by constructing an arm bracket in which the bracket 15 can vibrate in the direction of the arrow E around the fulcrum shaft 15S as shown in the partially enlarged view of FIG. It may be configured to be expandable and retractable in the E direction. In this embodiment, the pressure bar body is basically placed above and the planer stand is placed below, so that the pressure bar body is sandwiched between the bottom surface of the pressure bar body and the top surface of the planer stand. Since the cut veneer is transported using the space provided by the veneer as a conveyance path, the installation of the pressure roller 14 depends exclusively on the planer stand. Therefore, there is also a method of suspending and holding the pressure roller.

Reference numeral 21 denotes a pressure bar body, which is generally placed on the upper part of the planer stand 11 and is configured to be able to move forward and backward toward the log 1 by means of a planer stand guide (not shown) that holds the left and right end surfaces together with the planer stand. The side of the pressure bar body facing the log is formed into an inclined surface 21', and serves as a mounting surface for a pressure bar 22 having a plurality of rectangular shapes or a plurality of notches. 23 is a roller disk, which is arranged in a straight line so as to be parallel to the log, and serves as a pressing part 22' for the raw wood. 23 is a roller disk, which is a plurality of relatively thin disc-shaped disks that are directly or attached to the rotating shaft 24 in the shape of a skewer. The roller discs 23 and the rotating shaft 24 are either indirectly mounted via flanges or the like, or formed into a single piece by machining or the like, between the plurality of rectangular pressure bars mentioned above, or between the plurality of notches in the pressure bar. A variable speed electric motor (not shown), etc., located at the outer circumferential speed of log 1 moves the arrow B
rotationally driven in the direction.

Further, the outer peripheral surface of the roller disk 23 is normally used as the pressing part 2 of the pressure bar 22 against the rotating log 1.
Slightly from 2', it presses into contact with the outer peripheral surface of the log on the upper side in the rotational direction of the log, while the lower part of the outer peripheral surface of the roller disk is pivoted by bearings at a related position where it contacts the upper surface of the veneer V to be cut and produced. has been done.

25 is the lower surface 21A of the pressure bar body 21
Similar to the pressure roller 14, a plurality of guide rollers are arranged near the pressure roller 14 and have a small width and use mini-bearings, etc., and are rotatable in the direction of arrow D near the lower surface of the pressure bar body 21 via a bracket 26. The guide roller 25, whose axis is parallel to the cutting edge line of the cutter 12, cooperates with the pressure roller 14 to form a single-plate passage with the outer circumferential surfaces of both rollers facing each other. The distance between the guide rollers is usually set to be slightly wider than the thickness of the veneer to be produced, and in some cases several times as large, and the guide rollers are arranged so as to be slightly lower than the pressure roller 14 in the height direction. Furthermore, the arrangement of the pressure bar body 21 in the width direction (direction of the axis of the raw wood) is normally arranged to avoid the position of the pressure roller 14, but if the pressure roller is arranged at a position where the roller disk 23 is removed, etc. , may be placed at the same position as the pressure roller. Figure 6 shows the X in Figure 1.
Although this is a view from the arrow, only the roller disk 23, pressure roller 14, and guide roller 25 are shown.
This shows an embodiment in which the roller disk 23 is disposed approximately midway between the pressure roller 14 and the guide roller 25. Also, like the pressure roller, depending on the species of the raw wood, the width of the cut veneer, etc., the pressure roller body 21 may be arranged by thinning out the middle part or the left and right ends in the width direction. It is arranged to be movable in the direction F, and can approach and move away from the pressure roller 14.The pressure roller The guide roller is separated from the veneer to release the veneer bending action for removing curls from the veneer. Further, although the guide roller is shown as a combination of two rollers and one rotating shaft 25S that pivotally supports the roller in FIG. 5, it is also possible to use a rotating shaft that is separately mounted for each roller. Alternatively, the guide rollers 25 may be fitted one after another onto a single shaft extending over the entire width of the pressure bar body 21. Even in these cases, the rollers have the same functions as the rollers, such as the above-mentioned thinning arrangement and mounting movable in the direction of arrow F.

In addition, in the configuration of the combination of the base 13, the pressure roller 14, the pressure member 16, the roller disk 23, and the guide roller 25 of the present invention, the roller disk may be, for example, a piercing rotating body disk with a large number of piercing bodies provided on the outer peripheral surface, or Even if the outer peripheral surface is replaced with a friction roller disk or the like coated with an elastic material such as rubber, by appropriately adjusting the peripheral speed of rotation of the disk, short cracks can be generated in the width direction of the curled veneer being cut. The effect of so-called tenderizing treatment, which transforms the veneer into a flat and supple veneer, can be achieved in exactly the same way.

To explain the embodiment of the present invention described in detail above, from the cutting edge formed by the tip 22' of the pressure bar 22 that presses the outer peripheral surface of the log 1 by rotation of the log 1, and the blade tip of the cutter 12, The veneer V is cut and produced, and the veneer passes through the veneer guide surface 13G of the base 13 and reaches the pressure roller 14, where the veneer moves downward against the upward pressure of the pressure member 16. The roller disk is pushed down and held between the roller disk 23 and the pressure roller 13 and transported further downstream.At this time, the roller disk is rotated at a peripheral speed 2 to 30% higher than the peripheral speed of the raw wood, and the blade 12 is The tip of the cut veneer V extending from the tip of the blade to the space between the pressure rollers 14 (the veneer near the pressure roller) is pulled by the pinch roller effect of the pressure roller and roller disc. Therefore, the veneer V is slightly stretched in the conveying direction and undergoes preliminary tenderizing.Furthermore, the veneer is transported and reaches the guide roller 25, where it is softened by the pressure roller 14 and the guide roller. The plate is bent in the opposite direction to the curl, and this bending action is caused by the eccentric rotation of the pressure roller or the movement of the pressure roller toward and away from the guide roller due to the irregularities on the outer circumferential surface of the pressure roller. As a result, numerous short cracks occur on the surface of the veneer in the width direction of the veneer.A complete tenderizing process with no defects occurs without delay while cutting and transporting the veneer, resulting in flat and large cracks. This means that a high-quality veneer that is flexible and has no scratches can be obtained at a high yield.Of course, a high-quality veneer that does not have any puncture marks or the like on the veneer can be obtained at the same time as cutting the raw wood.

Note that the roller disk 23 is the pressure bar 2.
The log pressing part 22' presses the log slightly higher in the rotational direction of the log, and rotates at a peripheral speed faster than the log's outer circumferential speed. This prevents radial cracks such as dry cracks from the end of the log When cutting a certain log, in a general veneer lace, the cracking is further accelerated by the cutting resistance of the cutter or the pressure bar, and eventually develops into destruction of the log, but in this device, the roller disc cuts the log. It has the effect of pushing the cracked part on the outer circumferential surface into the cutting edge, and it is now possible to cut the veneer to the end without breaking the log while preventing the cracked log from breaking during veneer cutting. Furthermore, a large number of these roller disks that rotate at high peripheral speeds are arranged near the cutting edge, and have a so-called cleaning effect that prevents the blade from clogging due to dust from the raw wood or thin veneer scraps adhering to the area near the cutting edge. Able to demonstrate
Therefore, interruptions in veneer cutting due to blade clogging are eliminated, and the operating rate of the veneer lace can be dramatically improved, resulting in an extremely efficient veneer lace compared to conventional equipment, contributing to this industry.

[Brief explanation of the drawing]

1 and 2 are side sectional views of an embodiment of the present invention; FIGS. 3 and 4 are partially enlarged side sectional views;
6 and 6 are views taken along the X arrow in FIG. 1 or 2, and FIG. 7 is a side view of various pressure rollers. 1... Log, 11... Planer stand, 12... Knife, 1
3...Bag, 13G...Single plate guide surface, 14...Pressure roller, 15...Bracket, 16...Pressure member, 21...Pressure bar body, 21A...
Lower surface of pressure bar body, 22...pressure bar, 23...roller disk, 24...rotating shaft, 25...guide roller, 26...bracket, T...projection, V, V'...veneer plate.

Claims (1)

[Scope of Claims] 1. A veneer lace for cutting veneer from raw wood, including a planer stand with a cutter attached to the front and a base with a veneer guide surface arranged parallel to the knife, and an end portion of the veneer guide surface of the base. A plurality of pressure rollers are arranged eccentrically rotatably in the vicinity, a pressure bar body is arranged on the top of the planer stand, and the pressure roller body is formed into a disc shape and is attached to a rotating shaft in the shape of a plurality of skewers, and the outer peripheral surface thereof is made of raw wood. The roller disc is pivotally supported at the tip of the pressure bar body so that it can contact both the outer circumferential surface of the machine and the veneer after cutting, and it has a roller disc that is divided into multiple parts or has multiple notches, and is installed at the tip of the pressure bar body. A veneer veneer lace curl removal device, comprising: a pressure bar; and a plurality of guide rollers rotatably arranged near the bottom surface of the pressure bar body. 2. The device for removing curls from a veneer lace according to claim 1, wherein the roller disk is driven at an outer peripheral speed faster than the outer peripheral speed of the log. 3. The device for removing curls from a veneer lace veneer according to claim 1 or 2, wherein the pressure roller is disposed on the planer stand via a pressure member. 4. The device for removing curls from a veneer lace according to any one of claims 1 to 3, wherein the pressure roller has an uneven surface. 5. In the veneer lace according to any one of claims 1 to 4, the pressure roller is disposed at the same position as the roller disk in the width direction of the planer stand. Curl removal device. 6. The veneer lace in the veneer lace according to any one of claims 1 to 4, characterized in that the pressure roller is disposed at a position dodging the roller disk in the width direction of the planer stand. decurling device.