JPS59204502A - Outer-circumference drive with axial fixing function of material wood in veneer lathe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for improving the axial center of raw wood in veneer lace.
For more details regarding the peripheral drive device with IM & function,
At least two drive rollers are arranged so that the shortest length from the axis of the main shaft to the outer peripheral surface of each drive roller gradually increases slightly along the rotation direction of the log, corresponding to the thickness of the veneer veneer to be cut. The veneer lace has a function of immobilizing the axis of the log in a veneer lace, which is characterized by keeping the precise position of the log immobile during cutting and supplying driving force from the outer circumferential surface of the log by moving it in a straight line. This relates to the outer periphery wAa device.

When cutting a log by supplying part or all of the driving force around the outer circumference of the log by moving at least two driving rollers arranged along the circumference around the main shaft in a straight line toward the main shaft. , as shown in FIG. 14, if the shortest length r from the fine center O8 of the main shaft to the outer peripheral surface of each drive roller R1+R2, R3 is set equal, the cross-sectional shape of the log W during cutting will be from its axis OW to Since the length up to the outer circumferential surface gradually increases along the rotation direction of the log W and reaches its maximum just before cutting, it has a six-turn curved shape, so theoretically only the upper drive roller R1 closest to the cutter 40 can be used. supplies driving force while pressing the outer peripheral surface of the log W, and a small gap is formed between the other drive rollers R2, R3 and the outer peripheral surface of the log W, resulting in a non-contact state, and the drive roller R2 , R3 will not supply driving force.

However, in reality, the upper drive roller R1 pushes down the log W, and the log W is cut in a state where the axis Os of the main shaft and the axis Ov of the log W are deviated from each other.

For this reason, the relative position between the axis OW of the raw wood W and the tip of the cutter 40 fluctuates, making the cutting condition unstable, making it impossible to obtain a veneer veneer with the set thickness, and the veneer veneer being cut. Further, due to the above-mentioned reasons, the drive efficiency of each of the drive rollers R1, R2, and R3 is poor, resulting in problems such as the inability to cut the raw wood to a fine thickness.

In view of the above-mentioned problems, the present invention changes the position of the main shaft of at least two drive rollers in accordance with the thickness of the veneer veneer to be cut, thereby keeping the fine position of the raw wood immobile during cutting. This system was designed to supply driving force from the outer circumferential surface of the raw wood, and the gist of its configuration is that each opposing side of the veneer race's ambidextrous spindle is synchronously rotated via a synchronizing means. At least two pairs of equally pitched feed screws are arranged along the radial direction of the main shaft and facing each other, and a nut member is screwed onto each feed screw, and a nut member is screwed onto each of the feed screws. Frame guides are fixed along the radial direction of the main shaft at the same positions as the support positions of the feed screws, facing each other, and both end portions of each of the at least two frames are slidably slidable on the frame guides. At the same time, the nut members should be fixed to both ends of each frame, and drive rollers should be cut inside each frame to the shortest length from the axis of the main shaft to the outer peripheral surface of each drive roller. Attach the veneer so that it gradually increases in size along the rotational direction of the raw wood in accordance with the thickness of the veneer, and attach it to all frames or all frames except for one specific one.
A fine adjustment means is provided to finely adjust the position of the drive rollers relative to the nut member, and the drive rollers are driven from the outer circumference of the log by moving each drive roller synchronously linearly toward the axis of the main shaft while pressing against the outer circumferential surface of the log. It is to provide power.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In FIGS. 1 to 8, the opposite side surfaces 2 of each headstock l of the veneer race L are connected to each drive roller R1, R, which will be described later.
A synchronous linear movement device aA is installed to move R3 synchronously and linearly 1if. In addition, each headstock l
Since the groove configuration of the synchronous linear movement device @A installed in
Both synchronized linear movement devices A are used only for the necessary parts.
I will explain about it.

A ring-shaped protrusion 3 centered on the axis Os of the spindle S is provided on the side surface 2 of the headstock l, and a synchronizing bevel gear 5 serving as a synchronizing means is connected to the protrusion N53 via a bearing 4. is rotatably mounted. Opposing sides 2 of each headstock l
There are three pairs of feed screws 6 with threads in the same direction and with equal pitches.
are rotatably supported via brackets 7 along the radial direction of the main shaft S and facing each other. The three pairs of feed screws 6 are located above the synchronizing bevel gear 5, respectively.

They are located to the side and almost below.

A bevel gear 8 is attached to a drive shaft (not shown) of a hydraulic motor M4 fixed to the side surface 2 of the headstock l, and the bevel gear 8 and the synchronizing bevel gear 5 are meshed with each other. Each bevel gear 9 attached to the inner end of each feed screw 6 and the synchronizing bevel gear 5 mesh with each other, and the synchronizing bevel gear 5
The rotation of the feed screws 6 causes the feed screws 6 to rotate in the same direction in synchronization with each other.

The feed screw 6 on the opposing side surfaces 2 of each headstock 1
The frame chamber 10 is located at the same position as the supporting position of
They are fixed along the radial direction of the main shaft S and facing each other. The frame guide 10 is provided with a guide groove 11 along the radial direction of the main shaft S, as shown in FIG.

Each frame Fl, F2. Fitting protrusions 12 provided at both end portions of F3 are slidably fitted into guide grooves (3) of the frame guide 10, and each frame F1. F2. Drive rollers R11R are installed inside F3 via brackets 13, respectively.
2, R3 is rotatably supported. Each frame F1
．． F2. A drive motor M5 is attached to each side of F3, and a chain gear 14 is attached to the drive shaft (not shown) of the drive motor M5, and a chain gear 15 is attached to one end of the drive rollers R1, R21 and R3. A chain 16 is attached so that each drive motor rotates each drive roller R1, 'R2, R3.

Frame F1. Frame F2 is provided with fine adjustment means B for finely adjusting the relative positions of drive rollers J and R2 with respect to nut member N1, which will be described later, but frame F3 is not provided with such fine adjustment means.

As shown in FIGS. 3 and 6, the nut member Nl has female screws 1 (1, 20) screwed onto both ends of the main body 17 to engage with the feed screw 6 and the adjustment bolt 18, respectively. A fixing plate 21 is provided at the center of the main body 17, and a long hole 22 for adjusting the fixing position is provided in the fixing plate 21.
As shown in FIG. 7, an insertion hole 24 for inserting the main body 17 of the nut member Nl is provided in the partition wall 23 provided at both ends of the frame F1, and this insertion hole 24 is inserted into the partition wall 23 provided at both ends of the frame F1. It has a shape that allows slight movement in the axial direction of 6. The nut members N1 are each screwed into feed screws 6 for moving the frame Fl, and the main body 17 of the nut members N1(9)- is inserted into the insertion hole 24 of the partition wall 23, and the nut members Nl is fixed to the partition wall 23 via a fixing bolt 25, and 1! is attached to one end of the main body 17 of the nut member N1. A case bolt 18 is screwed together. In this embodiment, the adjustment bolt 18 and the nut member N1 constitute a fine fil adjustment means B, and by loosening the fixing bolt 25 and moving the adjustment bolt 18 forward and backward, the drive roller R1 is slightly moved in the radial direction of the main shaft S. , the relative position of the drive roller R1 with respect to the nut member Nl is changed.

The configuration of the fine adjustment means provided on the frame F2 is the same as the configuration of the fine adjustment means B provided on the frame Fl, so a description thereof will be omitted.

Further, as shown in FIG. 8, another nut member N2 is screwed into each of the feed screws 6 for moving the frame F3, and this nut member N2 screws a fixing bolt 25 into the partition wall 23 of the frame F3. Fixed through. Therefore, the position of the drive roller R3 with respect to the nut member N2 is constant and cannot be changed (10).

The main shaft S has a double structure consisting of a first main shaft S1 having a large-diameter chuck C1 attached to its tip, and a second main shaft S2 having a small-diameter chuck C2 attached to its tip. S2 is slidably inserted into the first main shaft Sl,
The second main shaft S2 equipped with the small diameter chuck C2 is configured to move forward and backward independently with respect to the first main shaft S1. The outer periphery of each of the driving rollers R1, R2, R3 is configured such that a required driving force is transmitted when pressing the outer periphery of the log W whose end surfaces are held between the chucks C1 and C2. For example, in the axial direction,
Alternatively, a configuration may be adopted in which a large number of grooves are provided in a direction inclined at a predetermined angle with respect to the axial direction.

Further, the tool rest 27 on which the cutter 26 is attached is configured to reciprocate in a direction inclined at a predetermined angle with respect to the horizontal, and moves forward in a forward-inclined state. Note that 28 in the figure indicates a pressing roller for pressing the raw wood W immediately before cutting.

Next, the operation of the above embodiment will be explained. First, we will explain the case of cutting logs with a nearly perfect circular cross section, and then the case of cutting logs with a non-perfect circular cross section.1. I will explain about it.

First, frame F1. The position of each drive roller R1, R2 with respect to each nut member Nl is finely adjusted by moving each adjustment bolt 1B constituting each fine adjustment means B provided at F2 forward and backward.
By adjusting the main axis S as shown in the gta diagram,
The shortest length rl, r2 . from the axis Os to each outer peripheral surface of each drive roller R1, R2, R3. r3 gradually increases along the rotation direction of the raw wood W, and
The difference in the shortest length between rollers 1 and R2 (rl r2), and the difference in the shortest length between adjacent drive rollers R2 and R3 (r2 r3) are the thickness t of the veneer veneer to be cut. Each drive roller R1, R is predetermined to correspond to
2. R3 is arranged along a spiral curve corresponding to the cross-sectional shape of the raw wood W during cutting. On the other hand, (11) the hydraulic motor M4 is reversely rotated at high speed to
, R2, and R3 are moved far back from the axis Os of the main shaft S to provide an interval between the driving rollers R1 and R2 that can supply the raw wood W to be cut, as shown in FIG. , both chucks c1. Move c2 back.

In this state, a log W with a cross section of a perfect circle is processed using a known material feeding device (not shown) equipped with a log centering function.
At the same time, this raw wood W is fed between both chucks CI and C2, and then both chucks C1 and C2
are made to protrude to sandwich both end surfaces of the log W, and then the material feeding device is moved to the outside of the veneer race L.

Next, when each hydraulic motor M4 is rotated in the forward direction, the three pairs of feed screws 6 are rotated synchronously in the same direction via the synchronizing bevel gear 5, whereby each drive roller R1, R2, R3 is rotated in the direction of the main shaft S. The log W moves synchronously in a straight line toward the axis OS.
(13) (12) However, hydraulic pressure continues to be applied to each hydraulic motor M4.

Thereafter, each frame F1. F2. While starting each drive motor M5 attached to F3, the first and second
When the main shafts Sl and S2 of the log W are rotated, driving force is supplied from both the outer circumferential surface and both end surfaces of the log W, and the log begins to rotate.Then, the tool rest 27 is rotated by a certain amount ( When the veneer veneer V to be cut is advanced to the thickness t), each of the moving rollers R1, R2, R
3 moves forward synchronously as the log W is cut while pressing the outer peripheral surface of the log W with a predetermined force by the hydraulic pressure of the hydraulic motor M4, and the log W is cut into a rectangular board shape by the cutter 26 to a predetermined shape. A veneer veneer ■ of the plate gt is obtained. Here, as mentioned above, each drive roller R1, R2, R3 is arranged along a spiral curve corresponding to the cross-sectional shape of the raw wood W during cutting, so as is clear from FIG. The axial center Os of S and the axial center OW of the log W always coincide, so that the log W is cut in an immobile state. Therefore, (14
) The raw wood W is cut in an extremely stable state, and a veneer veneer V having the set thickness is obtained.

Then, just before the diameter of the raw wood W becomes smaller due to cutting and becomes uncuttable, the tool post 27 is stopped, the hydraulic motor M4 is stopped, and then the rotation of the drive motor M5 and both chucks C1 and C2 is stopped.

Next, while retracting the tool rest 27, the hydraulic motor M
By rotating 4 in the reverse direction, each drive roller 'R1゜R2
, R3 are moved in a straight line and retreated.

Also, at the beginning of cutting, large diameter chuck C1 and small diameter chuck C
2 clamps both end surfaces of the log W and supplies driving force to the log W.
When the diameter of the log becomes below a certain value, by retracting only the large diameter chuck C1 and clamping both end faces of the log W with only the small diameter chuck C2, the diameter of the tool of the log W can be reduced, and in turn, the diameter of the log W can be reduced. Improves walking speed. In addition, when changing the thickness t of the veneer veneer V to be cut, the frame F
By moving each adjustment pole 1-18 constituting each fine adjustment means B provided at F2 forward and backward to change the position of each drive roller R1, R2 with respect to each nut member N1, the adjacent drive roller R1 and R2 which is the shortest length difference (rl r2), and the adjacent drive roller R
The difference in the shortest length (r2-r3) between R2 and R3 may be changed as appropriate.

On the other hand, to briefly explain the case of cutting a raw wood with a non-perfect circular cross section, the raw wood with a non-perfect circular cross section is roughly centered by the material feeding device, and this raw wood is fed between both chucks, and only the raw wood with a non-perfect circular cross section is cut. Rough cutting is performed by supplying a driving force from the periphery of the raw wood until the cross section becomes almost a perfect circle, and thereafter the raw wood may be cut by supplying a driving force from the outer periphery of the log using the method described above.

The above embodiment includes three frames Fl, F2', F3, and each frame F1. F2. Drive rollers R1, R2, and R3 are installed inside F3, respectively, and frames Fl and F
However, the embodiments shown in FIGS. 9(15) and 101 have two frames F.
1. F2 are provided facing each other in the vertical direction, and a driving roller R1 is provided inside each frame Fl and F2, respectively.
, R2 are attached, and the power of the drive motor M5 attached to each frame Fl, F2 is transmitted via the chain 16 to one drive roller R1, R2, respectively, and one drive roller R
1, R2 is configured so that the power of the other drive rollers R1, R2 is transmitted through a gear train 29, and each of the drive rollers J, R2 is a synchronous direct moving device 1 having the same configuration as the above embodiment.
1A so that it moves in synchronization with the radial direction of the main shaft. A fine adjustment means B having the same configuration as the embodiment described above is provided in one or both of the frames Fl and F2,
This slight g1! @By means B, - each driving roller R of the battle
1 and R2 are placed at a position along a spiral curve corresponding to the cross-sectional shape of the raw wood W during cutting. In this embodiment as well, the axial center of the main shaft S and the axial center of the log W are always aligned, and the logs W are arranged so as to face each other in the vertical direction.
17) (16) Since the drive rollers R1 and R2 are firmly tightened, the raw wood W remains stationary, and the veneer veneer ■ of the set thickness is smoothly cut.

Next, a description will be given of still another embodiment of the present invention, only with respect to portions that differ from each of the embodiments described above. Although each of the above embodiments used a bevel gear as the synchronization means, this embodiment uses a control motor such as a pulse motor or a servo motor as the synchronization means, and the other configurations are the same as those of the above embodiments. That is, as shown in FIGS. 11 and 12, each frame F
1. F2. F3 are control motors M, , M2 .
It is equipped with M3. Both ends of the transmission shaft 30 are connected to each headstock 1
is rotatably supported by brackets 31 and 32 respectively fixed to one end of the transmission shaft 30 and the control motor Ml.
is connected to a drive shaft 33 via a coupling 34,
The bevel gears 35 and 36 attached to the middle and other ends of the transmission shaft 3o and the bevel gears 37 attached to the upper end of each feed screw 6 are meshed with each other, and the control motor M1
(18) Due to the rotation, both feed screws 6 rotate in opposite directions, and the drive roller R1 moves linearly.

In this embodiment, the feed screws 6 supported on the opposing side surfaces 2 of each headstock l have opposite threads. The configuration for linearly moving the other drive rollers R2 and R3 is the same as the configuration for linearly moving the drive roller R1.

Then, in the same manner as in the above embodiment, the frame F1
The thickness t of the veneer veneer V to be cut by each drive roller R1, R2, R3 is determined by operating each fine adjustment means B provided in 2.
Each control motor M1. Command pulse common to town and u3,
When a code that commands the rotation direction is input, each control motor M, M, M3 rotates in the same direction in synchronization with each other,
For this reason, each drive roller R1, R2゜R3 presses the outer peripheral surface of the raw wood W with a predetermined force by the rotational torque of each control motor '1+'2+'3, and linearly moves in synchronization with each other as the original stomach is cut. gradually move forward.

In each of the above embodiments, driving force is supplied by mounting two or three drive rollers on the inside of the frame, but it is possible to In some cases, it is also possible to use four or more frames, and in each of the above embodiments, fine adjustment means is provided for all frames except for one specific frame. A fine adjustment means may be provided.

In the present invention, at least two drive rollers that move linearly toward the axis of the main shaft in synchronization with each other are arranged along a spiral curve corresponding to the cross-sectional shape of the raw wood at the time of cutting.
The log is cut with the axis of the main shaft always aligned with the axis of the log, and the outer periphery of the log being tightly tightened by each drive roller. For this reason, the raw wood is cut with its axial center position stationary, so the relative position between the fineness of the raw wood and the tip of the cutter does not change, and the thickness is exactly the same as the set thickness (19
) High-quality veneer veneer can be cut smoothly. Also, when changing the thickness of the veneer veneer to be cut, slight [
This can be handled freely by finely adjusting the position of the drive roller relative to the nut member by operating the adjustment means.

In addition, since each drive roller is configured to move linearly, the direction of the force applied to the log is always constant, and since the outer circumference of the log is tightly tightened by each drive roller during cutting, the initial From the beginning to the end of cutting, the log is reliably prevented from wobbling and is cut in a stable state.

Therefore, it is possible to cut a high-quality veneer veneer with a constant thickness, and it is also possible to prevent core cracking of the original material, idle rotation of the chuck, etc. that tend to occur when the diameter of the original wood becomes small.

Furthermore, since part or all of the driving force is supplied from the outer peripheral surface of the log to each drive row, the (21) (20) ratio of the driving force supplied from the chucks that clamp both end surfaces of the log is reduced. There can be some, some, or none at all. Therefore, it is possible to reduce the diameter of the chuck, and it is possible to cut raw wood to a small diameter, thereby improving the yield of raw wood.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a state in which raw wood is being cut by a veneer race equipped with an outer peripheral drive device according to an embodiment of the present invention, and FIG. 2 is a schematic side view of the state before the raw wood is cut. , FIG. 3 is a partially cutaway schematic front view of the wood being cut, FIG. 4 is a diagram showing the positional relationship between the synchronizing bevel gear 5 and the feed screw 6, and FIG. Frame F
6 is a perspective view of the nut member N1, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 3, and FIG. 8 is a partial view of the end of the frame F3. The cutaway front view and FIG. 9 are schematic side views of logs being cut by a veneer race equipped with a peripheral drive device according to another embodiment of the present invention. FIG. 11 is a plan view of the transmission part of the drive roller, and FIG. 11 is a side view of a log being cut by a veneer race equipped with a peripheral drive device according to yet another embodiment of the present invention, and FIG. 12 is a similar diagram. Fig. 13 is a partially cutaway front view, and Fig. 14 is a diagram showing a state in which the three drive rollers are arranged on a spiral curve corresponding to the cross-sectional shape of the wood during cutting to cut the wood. teeth,
It is a figure which shows the state where three drive rollers are arrange|positioned at the position of the same distance from the axis of a main shaft, and a log is cut. (Explanation of symbols of main parts) 1: Headstock 2: Side face of headstock 5: Synchronizing bevel gear (synchronizing means) 6: Feed screw lO: Frame guide 18: Adjusting bolt (fine adjustment means) J, R2, R3 : Drive roller (23) Ml, N2. M3! Control motor (synchronization means) Nl, N
2: Nut member (24) Fig. 13 R3 Fig. 14 B3 19

Claims (3)

[Claims] (1) At least two pairs of equally pitched feed screws, which rotate synchronously via a synchronizing means, are arranged along the radial direction of the main spindle on each opposing side surface of the sub-headstock of the veneer race, and are arranged in opposite directions. At the same time, a nut member is screwed onto each feed screw, and each frame guide is aligned in the radial direction of the main shaft at the same position as the support position of the feed screw on each side of the sub-headstock, and Both ends of at least two frames are slidably fitted into the frame guide, and the nut members are respectively fixed to both ends of each frame, and the nut members are respectively fixed to the inner side of each frame. Install the drive rollers so that the shortest length from the axis of the main shaft to the outer peripheral surface of each drive roller gradually increases slightly along the rotation direction of the log, corresponding to the thickness of the veneer veneer to be cut. and all said frames,
Alternatively, all frames except one specific frame are provided with fine adjustment means for finely adjusting the position of the drive rollers with respect to the nut member, and each drive roller is pressed against the outer peripheral surface of the log while moving toward the axis of the main shaft. A peripheral drive device having a function of immobilizing the axis of raw wood in veneer lace, characterized by supplying driving force from the outer periphery of the raw wood by synchronously moving the raw wood in a straight line. (2) An outer peripheral drive device having a function of keeping the axis of raw wood in a veneer lace as set forth in claim 1, wherein the synchronizing means is a bevel gear. (3) An outer peripheral drive device having a function of keeping the axis of raw wood in veneer lace as set forth in claim 1, wherein the synchronizing means is a control motor.