JPS6328764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a device for supplying log rotational force in a veneer lace, and more specifically, an apparatus for supplying log rotational force to a veneer lace. In addition to preventing excessive rotational force from being applied to the center of the log, the auxiliary feeding mechanism itself eliminates wood chips between the log and the freely rotatable roller bar to promote smooth cutting delivery. This invention relates to a device having so-called multiple functions, which is becoming increasingly popular.

In conventional veneer laces, the cutting part is composed of a cutting blade and a pressure member such as a roller bar or a pressure bar, and the rotational force for cutting the raw wood is supplied via a chuck that pivotally supports the raw wood.

However, in this kind of veneer lace,
Excessive rotational force is concentrated in the center of the log,
When it comes to logs that are weak in the center or have cracks in the center, the chuck often spins idly or the log itself cracks, making it impossible to cut. In addition, the recent situation regarding logs has seen a drastic decrease in the number of high-quality logs, forcing us to use logs that are soft, rotten, or cracked in the center, as described above. The biggest challenge in the plywood industry is how to cut such bad raw wood.

In addition, with the conventional veneer lace, if pieces of wood separated from the raw wood get stuck between the raw wood and the pressure member during cutting, there is no mechanism for removing these pieces, so cutting must be temporarily interrupted to remove them. This results in a significant decrease in the operating efficiency of the veneer lace.

In order to solve these conventional drawbacks, the present invention provides an auxiliary supply device for log rotational force in a veneer race that can supplementally supply rotational force from the outer periphery of the log and also eliminate wood chips at the cutting part. The present invention is to provide a rotary roll having a contact surface on its circumferential surface and rotatable by a drive mechanism, the circumferential surface of which is at least near the cutting edge of a blade for cutting veneer lace. In addition, a groove-shaped portion is provided at a position that can contact the outer periphery of the raw wood above the cutting edge in the rotational direction of the raw wood so as to be parallel to the cutting edge line of the cutting blade, and that extends in the circumferential direction on the circumferential surface of the rotating roll. A plurality of strips are provided to form a contact surface on the outer peripheral surface divided in the axial direction, and a freely rotatable roller bar piece having a diameter smaller than that of the rotating roll is interposed in the space of the groove-shaped portion of the rotating roll. It is in.

Here, the veneer race refers to a type of veneer race that supplies rotational force via a conventional chuck or back-up roll, and the present invention is intended solely for supplementary supply. Also, a roller bar piece that can freely rotate is one that is divided into one roller bar, in other words, when multiple roller bar pieces are arranged side by side, they can be considered to constitute one roller bar as a whole. Name what you can. Therefore, the state in which these freely rotatable roller bar pieces are interposed in the space of the grooved portion is, for example, 1 space 1
There are various possibilities, such as arranging one or two books, or arranging them one space apart, but all of them have one space as a whole.
This can be considered as a mere design matter within the scope of the book's function as a roller bar.

Next, embodiments of the present invention will be described based on the drawings.

For example, as shown in Figures 1 and 2, log A
In a veneer lace comprising a pair of chucks C, C that support and rotate both ends of a plane, and a cutting blade 1 on a plane stand 2, a rotatable rotary roll 3 is integrated with the plane stand 2, and the blade Prepare it parallel to the cutting edge line of 1. That is, a plurality of abutment members 6, which will be described later, are fixed to a blade stand D provided integrally with the planer stand 2, and a roller bar piece attachment arm 1 is attached to the upper side of the abutment members 6.
8 is provided protrudingly, and a roller bar piece 17 having a smaller diameter than the rotating roll 3 is attached to the tip of the arm 18 so as to freely rotate. Furthermore, cutouts 18a are provided on the upper side of these roller bar piece mounting arms 18,
The rotating shaft of the rotating roll 3 is rotatably placed thereon. Here, the roller bar piece attachment arm does not necessarily have to be formed integrally with the contact member 6, and its shape can be selected as appropriate, such as extending from above to below the rotating roll 3, for example. Incidentally, even if the roller bar is divided in its longitudinal direction, as long as the intervals between the sections are not too wide, the same effect as a conventional continuous roller bar can be obtained, but the force pushing against the log A will be reduced. However, it has been demonstrated that the risk of breaking the log due to pressing force and furthermore the cutting resistance is reduced. The rotating roll 3 has a contact surface on its circumferential surface, and has a drive mechanism B.
The blade is configured to be rotationally driven by the blade, and is provided at a position where the peripheral surface can come into contact with both the front plate surface immediately after cutting and the outer periphery of the log A on the upper side in the rotational direction of the log A than the cutting edge of the cutter 1. .

The circumferential surface of the rotating roll 3 may be flat, but in order to increase the frictional force with the veneer S and log A, it may have a convex shape 3 as shown generally in FIGS. 4a to 4d.
A, diagonal grooves 3b, parallel grooves 3c may be provided, or a wear-resistant material 3d such as urethane rubber may be coated. Further, as in the illustrated embodiment, the rotating roll 3 has a plurality of grooves extending in the circumferential direction on the circumferential surface, and the contact surface of the circumferential surface is divided at appropriate intervals in the axial direction. Therefore, an abutting member and a roller bar piece, which will be described later, can be interposed in the space of the groove, and each member is organically bonded and has the advantage of exhibiting an extremely effective function. Further, the rotating roll 3 is constructed by arranging disc-shaped rotating bodies 31 having contact surfaces on their circumferential surfaces at appropriate intervals in the axial direction, for example, by interposing spacers 32 between each rotating body 31. The roll formed in this way can be processed at a reduced cost and consumption cost. (See Fig. 7) In this embodiment, in order to effectively prevent the curling phenomenon of the veneer immediately after cutting, the rotating roll 3 is arranged so that its peripheral surface also contacts the front surface of the veneer immediately after cutting. In addition to this, it also has the following structure. That is, the rake face 1 of the cutter 1
A is integrally provided with a guide member 4 having a curved concave surface 4a that follows the circumferential surface of the rotary roll 3, that is, an arcuate concave surface that is approximately concentric with the circumferential surface of the rotary roll 3, and a guide member 4 that follows the circumferential surface of the rotary roll 3. and the curved concave surface 4a of the guide member 4, a single-plate discharge passage 5 having an appropriate interval is formed. The guide member 4 is the planer stand 2
The apex 4b is the end of the discharge passage 5, and the veneer S is released at this point. The shape of the curved concave surface 4a is preferably an arcuate concave surface that is concentric with the circumferential surface of the rotating roll 3a, as this allows smooth discharge of the veneer.
There is no problem even if the surface has a different curvature or slope than the peripheral surface.
In addition, the intervals between the discharge passages 5 of the veneers are appropriately set according to the thickness of the veneer S passing through, but especially at the apex 4b, which is the end of the discharge passage 5, the interval is set according to the thickness of the veneer S. It is better to have the same level as that for surface cracking. Furthermore, this guide member is
Even if it is provided integrally or integrally with the rake surface 1a of the cutter 1, or integrally or integrally with the rake surface of the cutting blade holding member (including the tip of the planer stand 2), It may be provided so as to straddle both.

Furthermore, near the end of the discharge passage 5 of the single plate, there is a contact surface that is inclined outward from the groove-shaped portion of the rotary roll 3 in the direction of rotation of the rotary roll 3 and intersects with the extended surface of the curved concave surface 4a. Abutment member 6 having 6a
That is, as described above, the corresponding contact member 6 is fixed to the blade stand d, and the veneer S to be discharged along the lower peripheral surface of the rotating roll 3 is moved from the front side (rotating roll 3 side) to the back side (the plane stand 2 side). (side).
Next, the drive mechanism B, for example, as shown in FIG.
A DC generator 8 is connected to the shaft of a variable speed main motor 7 that rotates a chuck C of veneer lace, and a generated voltage E1 proportional to the rotation speed of the log is obtained. Blade 1 moving towards the center
The position of is proportional to the diameter of log A, so
In connection with the movement of the cutter 1 (substantially the cutter 1
For example, a variable resistor 9 that changes (in relation to the movement of the planer stand 2) is installed in relation to the rotation of the feed screw 10, and as the cutting progresses, the raw wood A
The circuit is configured so that the voltage E2 is proportional to the product of the rotational speed and the amount of change in the log diameter (diameter) and is faithfully proportional to the cutting speed.

This voltage E2 is used as a speed control signal for the variable speed electric motor 11 for driving the rotary roll 3. On the other hand, the variable speed electric motor 11 is connected to a speed detection generator 1.
2 is connected to generate a generated voltage E3 proportional to the rotation of the rotary roll 3, the generated voltages E2 and E3 are compared and controlled by a comparator 13, and a predetermined deviation voltage E2-E3 is applied to the variable speed electric motor 11. The speed control signal is transmitted to the speed control panel 14 to proportionally control the speed of the variable speed electric motor 11 in accordance with the cutting speed.

In addition, in order to mechanically synchronize the circumferential speed of the log A and the circumferential speed of the rotary roll 3, the rotation of the chuck C is transmitted to the input shaft 15a of the transmission 15 through a gear etc., as shown in FIG. , Furthermore, the amount of change in the diameter of the log as the cutting progresses is determined by, for example, the feed screw 1 that moves the blade 1.
0 rotation is used to transmit it to the speed change adjustment shaft 15b of the transmission 15, and proportionally change the cutting speed due to changes in the rotation speed of the log A and the log diameter (proportional to the position of the cutter 1). It is also possible to take out the rotation from the output shaft 15c and faithfully transmit the rotation to the rotating roll 3 for synchronization.

In addition to the above-mentioned example, the relationship between the rotating roll 3 and the cutting speed can be changed by changing the circuit shown in FIG. 2 as shown in FIG. A regulator 16 is provided to manually adjust the generated voltage E2, and the voltage E2 corresponding to the circumferential speed of rotation is estimated to be lower than the actual circumferential speed of the log.
−Ex, and a circuit is constructed so that the rotating roll 3 can rotate at a slow circumferential speed proportional to that. Furthermore, the rotary roll 3 and the variable speed electric motor 11 are connected via an overrunning device (not shown), and in short, as shown in the graph of FIG. 6, the log peripheral speed v1 (cutting speed) and the rotary roll peripheral speed v2 are respectively idling At times, a slight speed difference v1-v2 is generated, and the rotary roll 3 comes into contact with the surface of the raw wood during cutting, so that the rotary roll 3 immediately rises from v2 to v1 due to the action of the overrunning device. (For example, as shown by line Y.) Alternatively, in the case of mechanical synchronization means (see Figure 3), this can be easily achieved by changing the gear ratios at appropriate locations in the master-slave relationship to predetermined ratios. .

Further, artificial synchronization can be achieved by driving the rotary roll 3 at a constant circumferential speed, manually adjusting the rotational circumferential speed of the log A with respect to the circumferential speed, and displaying the result using, for example, an electric speedometer. In this case as well, it is desirable to provide an overrunning device to make the circumferential speed of the log higher than the circumferential speed of the rotary roll 3 and start cutting.

The present invention is constructed as described above, and its operation will be explained as follows.

First, when log A starts rotating due to chuck C, rotary roll 3 starts rotating at the same circumferential speed as the circumferential speed of log A by electric motor 11. Then, the planer stand 2 moves forward toward the log A by the action of the feed screw 10, and when the peripheral surface of the rotary roll 3 comes into contact with the log A, rotational force of the log is also supplied from the rotary roll 3, and the log A is moved away from the log A. A veneer S is produced. Therefore, the rotational force supplied from the chuck C to the center of the log A can be reduced, and even if the center of the log is weak or cracked, it can be cut. Since the cut veneer S advances while being regulated on both sides in the veneer discharge passage 5 constituted by the rotating roll 3 and the guide member 4, the curling phenomenon is temporarily suppressed. After passing the apex 4b of the guide member 4, the restriction state is temporarily released.
Since there is an abutting member in the traveling direction, the traveling direction is forcibly changed by hitting the abutting surface 6a of the corresponding abutting member 6. Here, the veneer S is the vertex 4b
The upper and lower sides of the veneer S are pressed toward the blade 1 side, and cracks Sa are formed on the surface of the veneer S on the contact member 6 side.As a result of the continuous formation of the cracks Sa, curling occurs. A flat veneer with suppressed phenomena is produced. On the other hand, if a piece of wood gets stuck between the raw wood A and the roller bar piece 17, the rotational force of the rotating roll 3 located right next to the roller bar piece acts directly on the piece of wood, so the piece of wood is quickly removed and the piece of wood is quickly removed. It becomes possible to apply a conveying force to the veneer S in the plate discharge passage, so that the passage 5 is not clogged with the veneer S, and cracks Sa can be smoothly formed. In this way, rotating roll 3
The quality of the veneer is improved by forming a groove on the circumferential surface of the veneer, installing roller bars separately in the space of the groove, and interfering with each other to effectively demonstrate the functions of both. A roller bar used for stability is used in the same way as a conventional veneer lace, and rotating rolls that can supplementally supply rotational force to the log and remove wood chips are attached to the outer circumference of the log and the veneer immediately after cutting. It is extremely effective because it can be provided in a position where both can be contacted.

As described above, the present invention has the combined function of contacting the outer periphery of the log to supplementally supply rotational force of the log, and the device itself removing wood chips between the log and the roller bar piece. , it is possible to increase the operating rate of veneer lace and improve the yield of veneer. In other words, since it is possible to reduce the rotational force supplied from the chuck, it is possible to cut even rough logs that are weak or have cracks in the center. There is no chance of wood chips getting stuck between the bar pieces.

Furthermore, since the circumferential contact surface of the rotating roll is almost smooth, there is almost no damage to the surface of the raw wood, and the surface of the carved veneer is extremely beautiful.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view for explaining an embodiment of the device of the present invention, FIG. 2 is an explanatory view of the same drive mechanism, FIG. 3 is an explanatory view of another drive mechanism in the same device, 4a,
4b, 4c, and 4d are embodiments of the rotating roll, FIG. 5 is an explanatory diagram showing another method of controlling the drive mechanism in the apparatus of the embodiment, and FIG. 6 is a diagram showing the cutting speed and the overrunning device. FIG. 7 is an explanatory diagram of an embodiment of a rotating roll having a divided contact surface. A... Log, B... Rotating roll drive mechanism, C
...Chick, S...Single board, Sa...Cracked surface, 1
...Cutting knife, 1a... Rake face of knife, 2...
... Planer stand, 3... Rotating roll, 3a, 3b, 3c...
...notch, 3d... wear-resistant material such as urethane rubber, 4... guide member, 4a... curved concave surface, 4b
... Vertex, 5 ... Single plate discharge passage, 6 ... Contact member, 6a ... Contact surface, 7 ... Main motor, 8 ... DC generator, 9 ... Variable resistor, 10 ... Feed Screw, 11... Variable speed motor, 12... Speed detection generator, 13... Comparator, 14... Control panel, 15
...Transmission, 16...Adjuster, 17...Roller bar piece, 18...Roller bar piece mounting arm,
31... Disc-shaped rotating body, 32... Spacer.

Claims (1)

[Claims] 1. A rotary roll having a contact surface on its circumferential surface and rotatable by a drive mechanism, the circumferential surface of which is at least near the cutting edge of a cutting blade for veneer lace, and which is located above the cutting edge in the direction of rotation of the log. A contact surface of the outer circumferential surface is provided at a position where it can contact the outer periphery of the log so as to be parallel to the cutting edge line of the cutting blade, and a plurality of grooves extending in the circumferential direction are provided on the circumferential surface of the rotating roll. Log rotation force in a veneer lace, characterized in that the rotary roll is divided into parts in the axial direction, and a freely rotatable roller bar piece having a smaller diameter than the rotary roll is interposed in the groove-shaped space of the rotary roll. auxiliary feeding equipment.