JPS5854643B2 - Veneer rotary lace with endless strip cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a veneer rotary race for cutting a thin sheet-like veneer veneer by gripping and rotating raw wood as a raw material. While rotating the veneer, the veneer is cut by a veneer cutting part parallel to the axis of the log, reducing the cutting resistance caused by the knife and making effective use of low-grade logs with fragile wood parts to produce veneers with a high yield. The purpose of this method is to increase the yield of veneer by making it possible to cut logs down to small diameters.

Conventionally, veneer cutting with a veneer race involves gripping the left and right butt ends of the raw wood, which are the raw materials, with the left and right spindles of the veneer race aligning their respective axes. In the race, we usually use 1001C! or equivalent) to rotate the raw wood, and on the other hand, a cutting blade that covers the entire length of the raw wood is fixed to the turret and cuts into the outer circumferential surface of the rotating raw wood, and it corresponds to the thickness of the cutting veneer. A pressure bar (also called a nose bar) maintains a gap slightly narrower than the thickness of the veneer between the pressure bar and the cutting edge of the cutter.

) (The gap formed by the cutting edge and the tip of the nose bar is called the cutting edge.

) Veneer cutting was performed using the so-called push-cutting method, in which the log was rotated so that its outer periphery was bitten into the cutting edge.

When cutting these veneers, due to stress and other factors, countless minute cracks (referred to as back cracks) occur on the back surface of the veneer.

), and due to the hardness and softness of the woody parts of the log, local thickness unevenness tends to occur in veneers cut into wide sheet shapes.

In order to reduce these defects in the veneer and to improve the peeling surface of the veneer, the distance between the blade and the tip of the nose bar is made appropriately smaller than the thickness of the veneer, which is called aperture cutting. This is why it is common sense to narrow the gap between the blades in veneer lace.

However, on the other hand, since the veneer is cut and passes through the narrow gap, the cutting resistance naturally increases.

The cutting resistance also increases the power required to cut the veneer, which limits the gripping force of the chuck at the tip of the spindle that clamps the butt end of the log, and in the case of low-grade logs with a weak center. The center of the log gripped by the chuck may be rubbed and twisted, causing damage and the log itself becoming unable to receive the required power.Furthermore, the log, which has become thinner as cutting progresses, may be damaged due to the cutting resistance. When the log is pinched, it bends in a bow on the opposite side of the cutting edge, causing various problems such as the log breaking and making cutting to a specified small diameter impossible. This was a hindrance and caused a decrease in yield.

Furthermore, the above-mentioned problems are greatly affected by the sharpness of the cutting blade, and the more the cutting edge wears down and becomes less sharp, the more the damage will be compounded.Therefore, when cutting veneer lace, the blade must be replaced several times a day. This results in a decrease in work efficiency.

In order to eliminate these obstacles and produce high-quality veneer veneers at a high yield, pre-treatments such as boiling the logs for a certain period of time, or blowing steam directly or indirectly onto the atoms, or cutting tools, etc. Although improvements have been made to the nose bar, there is still no good solution.

In addition, attempts have been made to improve the veneer race of the conventional method using push-cutting, and to move the cutting blade reciprocatingly parallel to the axis of the raw wood while cutting the veneer using the race. In this case, a put point inevitably occurs between the forward and return strokes, and the cutter interrupts the cutting action each time in the iron part.In rotary cutting of the log, the cross section of the log becomes perfectly circular, resulting in a veneer. When the veneer is produced by continuous cutting, new defects occur, such as the places where the cutting was interrupted clearly remaining as traces on the veneer, and this has not been a complete solution.

The present invention focuses on this point and eliminates each of the above-mentioned obstacles, and further develops the pulling veneer cutting using a cutter to cut a thin endless strip using a cutter fixedly installed on the conventional veneer rotary lace cannon. By rotating the cutting tool in the direction that causes the cutting while it is in progress, and by setting the cutting part of the cutting tool parallel to the axis of the atom, we succeeded in significantly reducing the cutting resistance caused by the cutting tool, thereby limiting the cutting power. This makes it possible to cut high-quality veneer veneer while improving the raw wood yield.

Examples will be described below with reference to the drawings.

FIG. 1 is a plan view of the embodiment, and FIG. 2 is a side view.

In the figure, reference numeral 1 denotes raw wood, which is a raw material, and its left and right butt ends are clamped by spindles 3 and chucks 2 fitted to the tip of the 3, and rotated in the direction of arrow A by an electric motor (not shown) or the like. Ru.

Although not shown, the left and right frames holding the left and right spindles 3 and 3' are installed at the left and right ends of the log 1 in the longitudinal direction via strong beds, and only a part of them is shown in Figure 2. The illustrated gun turret 8 and Brella shear bar body 11 each have a turret at the bottom and a Brella shear bar body at the top, and are integrally held at their left and right end surfaces by a turret guide or the like so that they can approach or move away from the log 1. These devices are well-known and commonly used in the art.

Reference numeral 4 is a seamless, endless band-shaped knife with a relatively thin wall and a cross-sectional shape that is almost the same as a conventional veneer lace cutting knife.It has an appropriate elasticity in response to the load applied by atoms, vibrations, etc. when cutting a veneer. 5 and 6 are the band-shaped blades installed near the left and right ends of the cannon. Guide wheels 4 are arranged outside the full length of the blade support member 9, which will be described later, and are rotated in the directions of arrows C and D by a drive mechanism (not shown) such as an electric machine.

Note that it is also possible to drive only one of the guide wheels 5 or 6 and follow the other.

Then, the band-shaped cutter 4 described above is wound between the guide wheels 5 and 6, the tension guide wheel 7 described later, and the cutter support member 9, and is wound at an appropriate speed in the direction of arrow B, usually around 5 to 1 m/mi and 1 m/m. Two speeds around mm.

) is used to drive the winding.

Also, driving in the direction of arrow B may be driven in the opposite direction,
The power tool for cutting a veneer may be constructed so that the direction of rotation can be switched depending on the condition of the reverse grain of the wood.

Reference numeral 7 denotes a tension guide wheel for properly tensioning the cutter 4 to reduce its slippage and enable reliable rotation, and is movable in the direction of arrow H by a tensioning device such as a spring or a fluid cylinder. Except when the cutting blade 4 is replaced, etc., it affects the tension of the blade.

Further, since the contact angle between the cutter 4 and the guide wheel 7 is generally small, the guide wheel comes into pressure contact with the cutter 4 and is driven by the rotation of the cutter.

Note that instead of providing a specific tension guide wheel, for example, a tension device such as a spring or cylinder may be provided on either guide wheel 5 or 6 in FIG. It's okay to make you nervous.

In this case, either guide car 5 or 6 becomes the tension guide car.

In addition, the axes of the plurality of guide wheels are all set parallel to each other, and the tension guide wheels 7 are generally moved while keeping the axes parallel to each other. are all installed in the turret 8, and when the turret for cutting angle adjustment etc. swings around the vicinity of the cutting edge of the cutter, it moves together with the turret 8 centering on the vicinity of the cutting edge. be.

In the embodiment shown in Fig. 1, the cutter 40 has three guide wheels, but in order to ensure reliable rotation of the cutter without slippage, a total of five guide wheels are used as shown in Fig. 3. There are also embodiments in which the increased guide wheels 7', T'' are rotationally driven by an electric motor or other drive mechanism, or the tension guide wheels sandwiched between the guide wheels γ/, 7// are rotated by an arrow. In some cases, the guide wheels 7, 7', 7'' may be driven in the direction of mark E, or the guide wheels 7, 7', 7'' may follow the rotation of the cutter 40 to provide a guided movement.

Further, since a downward cutting load is constantly applied to the band-shaped cutter 4 during cutting of the veneer, each of the guide wheels 5, 6 and 7゜7', γ'', etc. is guided by the guide wheel 7 shown in FIG. 2, for example. It is preferable to use a so-called flanged guide wheel in which a flanged portion 7F having a slightly larger outer diameter than the guide surface 7G is provided at the lower part of the surface 7G.

Note that the flange may be omitted from part or all of the guide wheels 7, 7', 7''.

Further, the guide wheel may have an arcuate outer circumferential surface that serves as a guide surface, as in a woodworking band saw or the like.

In addition, as another embodiment, considering the rotation of the belt-shaped cutter without slipping more reliably, the cutter 4 is held between one or both of the guide wheels 4.5 and rotated in the direction of arrow J, as shown in FIG. A pressure contact roller 13 that is brought into pressure contact by a pressure mechanism (not shown) such as a spring or a fluid cylinder is arranged, and
The cutter 40 is rotated in the direction by a drive mechanism such as an electric motor.
In some cases, rotation is ensured.

Reference numeral 9 denotes a blade support member having a groove 10 accurately drilled to allow smooth rotation of the blade according to the thickness of the blade 4, and is placed at a predetermined position near the upper tip of the turret 8 on the side facing the raw wood. It is tightly held on the gun turret by a mounting member such as a hydraulic cylinder or a mounting bolt (not shown), and the groove 10 is made of a wear-resistant material, or the groove 10 is subjected to wear-resistant treatment, such as chrome plating, etc., to ensure that the blade 4 is properly positioned in the groove 10. This allows the veneer to be cut while being held and withstanding the cutting load resistance, vibration, etc. during veneer cutting.

Therefore, the blade 4 slides in the direction of arrow B since the back side 4B is not pressed against the groove 10 of the blade support member 9 during veneer cutting, and cuts a veneer cutting part K parallel to the axis of the log 1 and extending over the entire length of the log. In cutting a high-quality veneer, the cutting part K is the most important part that must be maintained correctly, and the material of the blade support member 9 must be carefully selected to ensure that it does not become distorted.

Reference numeral 12 denotes a pressure bar which is tightly held at a predetermined position at the tip of a pressure bar body disposed above the gun turret 8 by bolts or the like, and the tip of the pressure bar 12 and the cutting edge of the band-shaped cutter 4 constitute a cutting edge. It is.

The turret 8 and the pressure bar body 11 are integrally configured to move forward toward the log 1 by the thickness of the cut veneer per one rotation of the log, for example, by a feed screw (not shown).

As described in detail above, the present invention replaces the fixing blade, which was tightened to a predetermined position of the turret in the conventional veneer rotary lace, with an endless band-shaped blade with appropriate elasticity and rigidity, and uses the blade to cut a veneer. It is equipped with a veneer cutting part K that is held parallel to the axis of progress, and has perfectly realized so-called pull-cutting in which the blade is wound and driven by a winding drive mechanism between a plurality of guide wheels, and is different from conventional push-cutting. Compared to molds and reciprocating pull-cutting types, the cutting resistance can be significantly reduced, drastically reducing the cutting power for veneer laces, and making it possible to cut low-grade logs to small diameters, making effective use of logs and cutting tools. Because it is thin, it is possible to easily cut high-quality veneers without cracking.

[Brief explanation of drawings]

Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is a side view (part of the endless band-shaped cutter is omitted), Fig. 3 is a plan view of another embodiment, and Fig. 4 is a guide. FIG. 3 is a partial detailed view of a wheel, a band-shaped cutter, and a pressure roller. 1...Log, 2,2'-...Chuck,
3, 3'...Spindle, 4...Endless band-shaped blade, 5, 6, 7゜7', 7"...Guide wheel, 8...Cannon turret , 9... cutler support member,
10...Groove, 11...Pressure bar bottom 12...Pressure bar 13.
... Pressure roller, 4B ... Back of blade, K ... Single plate cutting part.

Claims (1)

[Claims] 1. A veneer rotary race that cuts a veneer while gripping and rotating raw wood, comprising a pressure bar body including a pressure bar, a turret disposed below the pressure bar body, and a turret mounted on the turret. Attaching multiple guide wheels with their axes parallel to each other,
A blade support member that is parallel to the axis of the log to be cut and extends over the entire length of the log is installed at the upper tip of the turret, and an endless belt-shaped blade wound between the plurality of guide wheels and the blade support member; A veneer rotary lace equipped with an endless band-shaped blade, characterized by comprising a tension guide wheel and a drive mechanism for the guide wheel. 2. A veneer rotary race equipped with an endless band-shaped cutter according to claim 1, wherein the guide wheel drive mechanism drives a portion of a plurality of guide wheels. 3. A veneer rotary race equipped with an endless band-shaped cutter according to claim 1 or 2, characterized in that a flange portion is provided on some or all of the plurality of guide wheels. 4. Any one of claims 1 to 3, characterized in that some of the guide wheels are provided with a pressure roller that clamps and presses the cutter, and a pressure mechanism and a drive mechanism for the pressure roller. Eta veneer rotary lace equipped with endless strip-shaped cutters.