JPS6111767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outer circumferential drive device having a function of keeping the axis of raw wood in veneer lace stationary, and more specifically, the present invention relates to an outer peripheral drive device having a function of keeping the axis of raw wood fixed in veneer lace. The shortest length to the outer circumferential surface corresponds to the thickness of the veneer veneer to be cut, and the pieces are arranged and moved in a straight line starting from the part immediately after cutting of the raw wood and gradually increasing slightly along the direction of rotation. This invention relates to an outer peripheral drive device having a function of keeping the axis of the raw wood in a fixed state during cutting and supplying driving force from the outer peripheral surface of the raw wood in veneer lace. .

When cutting a log by supplying part or all of the driving force from 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. , 1st
As shown in Figure 4, the shortest length r from the axis O _S of the main shaft to the outer peripheral surface of each drive roller R ₁ , R ₂ , R ₃
If , are set equally, the cross-sectional shape of the log W during cutting will be such that the length from the axis O _W to the outer circumferential surface gradually increases along the rotation direction starting from the part of the log W immediately after cutting, until it reaches the length immediately before cutting. Since it has _a spiral curve shape that reaches its maximum at
A small gap is formed between the other drive rollers R ₂ , R ₃ and the outer peripheral surface of the log W, resulting in a non-contact state, and no driving force is supplied from the drive rollers R ₂ , R ₃ . .

However, in reality, the upper drive roller R ₁ pushes down the log W, and the log W is cut with the axis O _S of the main shaft and the axis O _W of the log W being slightly offset. As a result, the relative position between the axis O _W of the raw wood W and the tip of the cutter 40 fluctuates, making the cutting condition unstable and making it impossible to obtain a veneer veneer with the set thickness. Due to variations in the thickness of the plate and due to the above reasons, each drive roller R ₁ ,
The driving efficiency due to R ₂ and R ₃ is poor, and there are problems such as the inability to cut logs into fine pieces.

In view of the above problems, the present invention changes the position of the axis of the raw wood during cutting by changing the arrangement position of at least two drive rollers with respect to the axis of the main shaft according to the thickness of the veneer veneer to be cut. This was done with the purpose of supplying driving force from the outer circumferential surface of the raw wood in an immobile state, and the gist of its configuration is that synchronous means is applied to each opposing side of both headstocks of the veneer race. At least two pairs of equally pitched feed screws that rotate at the same time are supported along the radial direction of the main shaft and are opposed to each other, and a nut member is screwed to each feed screw, respectively, and each side surface of both the headstocks is supported. Frame guides are fixed along the radial direction of the main shaft at the same positions as the supporting positions of the feed screws, and facing each other, and both side ends of each of the at least two frames are slidably slidable on the frame guides. Along with mating,
The nut members are fixed to both ends of each frame, and a drive roller is installed inside each frame. A single plywood plate is cut to the shortest length from the axis of the main shaft to the outer peripheral surface of each drive roller. Depending on the thickness, the nuts are installed starting at the part immediately after cutting the raw wood and gradually increasing in size along the direction of rotation, and the nuts are installed on all frames or on 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 member, and each drive roller is pressed against the outer circumferential surface of the log and moved linearly synchronously toward the axis of the main shaft, thereby applying driving force from the outer circumference of the log. The purpose is to supply

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

In FIGS. 1 to 8, the opposing side surfaces 2 of each headstock 1 of the veneer race L are synchronized for synchronously linearly moving each drive roller R ₁ , R ₂ , R ₃ to be described later. A linear movement device A is attached. still,
Since the configurations of the synchronous linear movement devices A mounted on each headstock 1 are the same, one of the synchronous linear movement devices A
Only the necessary parts will be explained about both synchronous linear movement devices A.

A ring-shaped protrusion 3 is protruded from the side surface 2 of the headstock 1 and is centered on the axis O _S of the spindle S.
A synchronizing bevel gear 5 serving as synchronizing means is rotatably mounted on the protrusion 3 via a bearing 4. On the opposing side surfaces 2 of each headstock 1, three pairs of feed screws 6 having threads in the same direction and at the same pitch are rotatable along the radial direction of the spindle S and facing each other via a bracket 7. is supported by. The three pairs of feed screws 6 are located above, approximately to the side of, and approximately below the synchronizing bevel gear 5, respectively.

Hydraulic motor M ₄ fixed to side 2 of headstock 1
A bevel gear 8 is attached to a drive shaft (not shown), and this bevel gear 8 and the synchronizing bevel gear 5 are meshed. Each bevel gear 9 attached to the inner end of each feed screw 6 is meshed with the synchronizing bevel gear 5, and the rotation of the synchronizing bevel gear 5 causes the feed screws 6 to move in synchronization with each other in the same direction. It's supposed to rotate.

Frame chambers 10 are fixed along the radial direction of the main shaft S at the same position as the supporting position of the feed screw 6 on the opposing side surfaces 2 of each headstock 1, 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.

Fitting protrusions 12 provided at both ends of each frame F ₁ , F ₂ , F ₃ are slidably fitted into guide grooves 11 of the frame guide 10 , and each frame F ₁ ,
Drive rollers R ₁ , R ₂ , and R ₃ are rotatably supported inside F ₂ and F ₃ via brackets 13, respectively. A drive motor _M5 is attached to the side of each frame _F1 , _F2 , _F3 , and the drive motor _M5
A chain gear 14 attached to a drive shaft (not shown) of
A chain 16 is attached to the chain gear 15 attached to one end of the drive rollers R ₁ , R ₂ , R ₃ , and each drive roller R ₁ , R ₂ , R ₃ is rotated by each drive motor M ₅ . It is becoming more and more common.

A nut member N ₁ (described later) is attached to the frame F ₁ and F ₂ .
A fine adjustment means B is provided for finely adjusting the relative positions of the drive rollers R ₁ and R ₂ with respect to each other, but the frame F ₃ is not provided with such fine adjustment means.

As shown in FIGS. 3 and 6, the nut member N ₁ has female screws 19 and 20 screwed into 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 is perpendicular to the main body 17.
The fixing plate 21 has a configuration in which a long hole 22 for adjusting the fixing position is provided. On the other hand, as shown in FIGS. 3 and 7, an insertion hole 24 for inserting the main body 17 of the nut member N ₁ is provided in the partition wall 23 provided at both ends of the frame F ₁ . The hole 24 is shaped so that the frame F ₁ can move slightly in the axial direction of the feed screw 6. The nut members N ₁ are respectively screwed onto feed screws 6 for moving the frame F ₁ , and the main body 17 of the nut members N ₁ is inserted into the insertion hole 24 of the partition wall ₂₃ . is fixed to the partition wall 23 via a fixing bolt 25, and the main body ₁ of the nut member N1
An adjustment bolt 18 is screwed into one end of 7.
In this embodiment, the adjustment bolt 18 and the nut member N ₁
This constitutes a fine adjustment means B, and by loosening the fixing bolt 25 and moving the adjustment bolt 18 forward and backward, the drive roller R ₁ moves slightly in the radial direction of the main shaft S, thereby adjusting the relative position of the drive roller R ₁ with respect to the nut member N ₁ . The position is changed.

The structure of the fine adjustment means provided in the frame _F2 is the same as that of the fine adjustment means B provided in the frame _F1 .
Since the configuration is the same as that of , the explanation will be omitted.

Further, as shown in FIG. 8, another nut member _N2 is screwed onto each feed screw 6 for moving the frame _F3 , and this nut member _N2
is fixed to the partition wall 23 of the frame F ₃ via fixing bolts 25. Therefore, the position of the drive roller _R3 relative to the nut member _N2 is constant and cannot be changed.

The main shaft S has a first main shaft _S1 equipped with a large-diameter chuck _C1 at its tip, and a small-diameter chuck C1 at its tip.
It has a double structure consisting of a second spindle S ₂ equipped with C ₂ , and the second spindle S ₂ is slidably inserted into the first spindle S ₁ , and a small diameter chuck C ₂ is attached. The second main shaft S ₂ is configured to move forward and backward independently with respect to the first main shaft S ₁ . The outer periphery of each drive roller R ₁ , R ₂ , R ₃ is connected to both chucks.
It is necessary that the structure is configured so that the required driving force is transmitted when the outer peripheral surface of the raw wood W whose both end surfaces are held between C ₁ and C ₂ is pressed, for example, in the axial direction or The structure may be such that 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 mounted 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. In addition, 28 in the figure is the raw wood W just before cutting.
The pressure roller for pressing is shown.

Next, the operation of the above embodiment will be explained. First, a case will be described in which a log having a cross section of approximately perfect circle is cut, and then a case in which a log having a cross section which is not a perfect circle is cut will be explained.

First, the adjustment bolts 18 constituting the fine adjustment means B provided on the frames F ₁ and F ₂ are moved forward and backward to adjust the driving rollers R ₁ and R ₂ relative to each nut member N ₁ .
By finely adjusting the position of each drive _roller , as shown in FIG.
Shortest length r ₁ , r ₂ , r ₃ to each outer peripheral surface of R ₁ , R ₂ , R ₃
starts from the part of the log W immediately after cutting and gradually increases along the rotation direction, and the difference in the shortest length between the adjacent drive rollers R ₁ and R ₂ (r ₁ −
r ₂ ), and the difference in the shortest length between the adjacent drive rollers R ₂ and R ₃ (r ₂ - r ₃ ) is determined in advance so as to correspond to the thickness t of the veneer veneer V to be cut. , each drive roller R ₁ , R ₂ , R ₃ is arranged along a spiral curve corresponding to the cross-sectional shape of the raw wood W during cutting. On the other hand, the hydraulic motor _M4 is reversely rotated at high speed to cause each drive roller _R1 , _R2 , _R3 to move back greatly from the axis O _S of the main shaft S, so that the drive roller _R1 is rotated as shown in FIG. and the same R ₂ , the log W to be cut is
A gap is provided to allow the supply of water, and both chucks C ₁ and C ₂ are moved back.

In this state, the log W, which has an almost perfect circular cross section, is centered using a known material feeding device (not shown) equipped with a log centering function, and the log W is placed between the chucks C ₁ and C ₂ . Then, both chucks C ₁ and C ₂ are made to protrude to sandwich both end surfaces of the raw wood W, and then the material feeding device is moved to the outside of the veneer race L.

Then, when each hydraulic motor _M4 is rotated forward,
The three pairs of feed screws 6 rotate synchronously in the same direction via the synchronizing bevel gear 5, so that each drive roller R ₁ , R ₂ , R ₃ synchronously moves toward the axis O _S of the main shaft S. It moves in a straight line and comes into contact with the outer peripheral surface of the raw wood W, making it impossible to move forward, but hydraulic pressure continues to be applied to each hydraulic motor _M4 . After that, each frame F ₁ , F ₂ ,
When each drive motor M ₅ attached to F ₃ is started and the first and second main shafts S ₁ and S ₂ are rotated, driving force is supplied from both the outer peripheral surface and both end surfaces of the log W. When the raw wood starts to rotate, and then the tool post 27 is advanced by a certain amount (thickness t of the veneer veneer V to be cut) per one revolution of the raw wood W, each drive as shown in FIG. Rollers R ₁ , R ₂ , R ₃
presses the outer circumferential surface of the log W with a predetermined force by the hydraulic pressure of the hydraulic motor M ₄ and advances synchronously with the cutting of the log W, and the log W is cut into a thin plate shape by the cutter 26 to form a predetermined shape. Veneer veneer V with thickness t
is obtained. Here, as mentioned above, each drive roller R ₁ , R ₂ , R ₃ 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. In addition, the axis O _S of the main shaft S and the axis O _W of the log W are always aligned, and therefore the log W is cut in an immobile state. Therefore, the raw wood W is cut in an extremely stable state, and a veneer veneer V having the set thickness can be obtained.

Immediately before the diameter of the log W becomes too small to be cut, the tool rest 27 is stopped, the hydraulic motor _N4 is stopped, and the rotation of the drive motor _M5 and both chucks _C1 and _C2 is stopped. make it stop. Next, while retracting the tool rest 27,
By rotating the hydraulic motor _M4 in the reverse direction, each drive roller _R1 , _R2 , _R3 is moved linearly and retreated.

In addition, at the beginning of cutting, the large diameter chuck C ₁ and the small diameter chuck C ₂ clamp both end faces of the log W to supply driving force, and when the diameter of the log W becomes below a certain value,
Retract only large diameter chuck C ₁ to create small diameter chuck
By holding both end faces of the log W with only C ₂ , the diameter of the core of the log W can be reduced,
As a result, the yield is improved. In addition, when changing the thickness t of the veneer veneer V to be cut, the frame
Each nut member is adjusted by advancing and retracting each adjustment bolt 18 that constitutes each fine adjustment means B provided at F ₁ and F ₂ .
By changing the position of each drive roller R _{1 and} R 2 with respect to N ₁ , the position of each drive roller R ₁ and R 2 is the same as that of the adjacent drive roller R ₁
The shortest length difference (r ₁ − _{r 2} ) with R ₂ and the shortest length difference (r ₂ − _{r 3} ) between the adjacent drive rollers R ₂ and R ₃ may be changed as appropriate. .

On the other hand, to briefly explain the case of cutting a raw wood with a non-round cross section, the raw wood with a non-round cross section is roughly centered by the wood supply device, and this raw wood is fed between both chucks, and only the raw wood with a non-round 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 F ₁ , F ₂ , F _{3 ,} and drive rollers R ₁ , R ₂ , R ₃ are installed inside each frame F ₁ , F ₂ , F ₃ , respectively.
In the embodiment shown in FIGS _{. 9 and 10, the two frames F 1 and F 2 are substantially vertically} opposed to each other. A pair of drive rollers R ₁ , R ₂ are installed inside each frame F ₁ , F ₂ , and a drive motor is installed in each frame F ₁ , F ₂ .
The power of M ₅ is transmitted to one drive roller R ₁ , R ₂ via a chain 16, and one drive roller
The power of R ₁ , R ₂ is transmitted to the other driving roller R ₁ , R ₂ via a gear train 29, and each driving roller R ₁ , R ₂ is a synchronous direct drive roller having the same configuration as the previous embodiment. The moving device A moves the spindle in synchronization with the radial direction of the main shaft. Each frame F ₁ ,
A fine adjustment means B having the same configuration as in the above embodiment is provided on one or both of F ₂ , and the fine adjustment means B controls the cross section of the raw wood W when cutting each drive roller R ₁ , R ₂ addressed to the pair. Place it at a position along the spiral curve corresponding to the shape. Also in this example,
The axial center of the main shaft S and the axial center of the log W are always aligned, and the log W is firmly tightened by a pair of drive rollers R ₁ and R ₂ arranged almost vertically facing each other. The log W remains stationary, and the veneer veneer V 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 are different from each of the embodiments described above. Although each of the embodiments described above 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 embodiments described above. That is, as shown in FIGS. 11 and 12, each frame F ₁ ,
F ₂ and F ₃ are provided with control motors M ₁ , M ₂ and M ₃ , respectively. Both ends of the transmission shaft 30 are connected to each headstock 1
The transmission shaft 30 is rotatably supported by brackets 31 and 32 respectively fixed to the drive shaft 34, and one end of the transmission shaft 30 and the drive shaft 33 of the control motor _M1 are connected to a coupling ring 34.
bevel gears 35 and 36 connected to each other via the transmission shaft 30 and attached to the middle and other ends of the transmission shaft 30, and each bevel gear 37 attached to the upper end of each feed screw 6.
are meshed with each other, and both feed screws 6 are rotated in opposite directions by the rotation of the control motor _M1 , so that the drive roller _R1 is moved linearly. still,
In this embodiment, the respective feed screws 6 supported on the opposing side surfaces 2 of each headstock 1 have opposite threads.
The configuration for linearly moving the other drive rollers R ₂ and R ₃ is the same as the configuration for linearly moving the drive roller R ₁ .

Then, in the same manner as in the previous embodiment, the frame
By operating each fine adjustment means B provided in F ₁ and F ₂ , each driving roller R ₁ , R ₂ , and R ₃ is moved along a spiral curve corresponding to the thickness t of the veneer veneer V to be cut. When the control motors M ₁ , M ₂ , M ₃ are arranged together and a common command pulse and a code for commanding the rotation direction are input to each control motor M 1 , M 2 , M 3 , the control motors M ₁ , M 2 , M ₃
M ₃ rotate in the same direction and in synchronization with each other, so each drive roller R ₁ , R ₂ , R ₃ is connected to each control motor.
The rotational torques of M ₁ , M ₂ , and M ₃ press the outer circumferential surface of the log W with a predetermined force, and as the log W is cut, they gradually advance linearly in synchronization with each other.

In each of the above embodiments, the driving force is supplied by installing two or three drive rollers inside 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 spindle in synchronization with each other are arranged along a spiral curve corresponding to the cross-sectional shape of the raw wood during cutting, so that the rollers move linearly toward the axis of the main spindle. The log is cut with the axis of the log always aligned 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 stationary, so the relative position between the axial center of the raw wood and the tip of the cutter does not change, resulting in high-quality veneer veneer of the specified thickness. Can be cut smoothly. Further, changes in the thickness of the veneer veneer to be cut can be freely handled by operating the fine adjustment means to finely adjust the position of the drive roller relative to the nut member.

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, chuck spin, etc. that tend to occur when the diameter of the log becomes small.

Furthermore, since part or all of the driving force is supplied from the outer peripheral surface of the log by each drive roller, it is possible to reduce the proportion of the driving force supplied from the chucks that clamp both end surfaces of the log. can be completely eliminated. Therefore, it is possible to reduce the diameter of the chuck, and the raw wood can be cut to a small diameter, thereby improving the yield of the 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. 6 is a perspective view of the nut member _N1 , FIG. 7 is a cross-sectional view taken along the line -- in _FIG . 3, and FIG. 8 is a plan view of the end of the frame _F3 . 9 is a schematic side view of a state in which raw wood is being cut by a veneer race equipped with a peripheral drive device according to another embodiment of the present invention, and FIG. FIG. 11 is a plan view of the transmission part of the drive roller in FIG. FIG. 13 is a partially cut-away front view showing a state in which the three drive rollers are arranged on a spiral curve corresponding to the cross-sectional shape of the log at the time of cutting, and the log is being cut.
FIG. 4 is a diagram showing a state in which three drive rollers are arranged at positions equidistant from the axis of the main shaft to cut raw wood. (Explanation of symbols of main parts), 1: Headstock, 2:
Side surface of headstock, 5: Bevel gear for synchronization (synchronization means), 6: Feed screw, 10: Frame guide, 1
8: Adjustment bolt (fine adjustment means), R ₁ , R ₂ , R ₃ : Drive roller, M ₁ , M ₂ , M ₃ : Control motor (synchronization means), N ₁ , N ₂ : Nut member.

Claims (1)

[Claims] 1. At least two pairs of equally pitched feed screws that rotate synchronously via synchronizing means are arranged along the radial direction of the main shaft on each opposing side surface of both headstocks of the veneer race, and The screws are supported oppositely to each other, and a nut member is screwed to each feed screw, and the 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 both headstocks, and supported facing each other,
Both ends of at least two frames are slidably fitted into the frame guide, the nut members are fixed to both ends of each frame, and drive rollers are installed inside each frame.
The shortest length from the axis of the main shaft to the outer peripheral surface of each drive roller gradually increases slightly along the direction of rotation starting from the part immediately after cutting the raw wood, corresponding to the thickness of the veneer veneer to be cut. Attach it as follows,
All of the frames or all the frames except for one specific frame are provided with fine adjustment means for finely adjusting the position of the drive roller with respect to the nut member,
The axis of the log in the veneer lace is characterized by supplying driving force 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. Peripheral drive device with functions. 2. A 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. A 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.