JP3665793B2 - Wood bending machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention bends wood. Equipment In particular, bending by inserting wood into the forming path of the bending mold To wear Related to the position.
[0002]
[Prior art]
Wood bent in two or three dimensions is used as an industrial product with excellent design. For example, furniture such as wooden chairs, wood parts such as Buddhist altars, door knobs and handles, automobile parts, home appliance parts, various care devices, and other bent wood are used.
[0003]
As a method for bending wood, a method shown in FIG. 1 has been developed. In this method, the wood W is bent along the surface of the bending die 21 and bent. This method has a drawback that it is easy to break because the surface side of the wood W to be bent extends. This is because the maximum allowable elongation in the fiber direction of the wood W is extremely small, only 1 to 2%. Although the maximum compression amount in the fiber direction is as large as about 30%, wood has a property that it is extremely easy to break with respect to elongation. If the compression in the fiber direction exceeds the maximum compression limit, the possibility of buckling due to partial splitting increases.
[0004]
In order to eliminate this drawback, the methods shown in FIGS. 2 and 3 have been developed. The method shown in FIG. 2 and FIG. 3 fixes the band iron 22 along the outside of the wood W to be bent. In this state, the outer side of the wood W does not extend, and the method of FIG. 2 pushes the inner mold 24 between the pair of rollers 23 to bend the wood W with the inner mold 24, and the method of FIG. The wood W is sandwiched between the male mold 26 and the male mold 26 and bent.
[0005]
[Problems to be solved by the invention]
However, the methods shown in these figures have the following drawbacks.
(1) The surface of the wood that contacts the band iron must be flat, and the cross-sectional shape of the wood to be bent is limited. For this reason, for example, columnar wood cannot be bent.
(2) The band iron needs to bend together with the wood, that is, it cannot be thicker than necessary because flexibility is required to bend flexibly. For this reason, there is a detrimental effect that the band iron stretches and breaks the wood when bending. If thick band iron is used so that it does not stretch, it cannot be bent together with wood.
(3) It is extremely difficult to securely and securely fix the wood and the belt. Both ends of the band iron are connected to the wood, but when the bending process is performed, the connecting portion is damaged, and the band iron and the wood are easily displaced. If the band iron is not firmly connected, the elongation of the wood that the band iron bends cannot be restricted, causing cracks.
(Four) Since it does not extend along the belt, the wood cannot be bent in three dimensions, and the shape of the bending process is restricted. For this reason, it cannot bend efficiently into various shapes.
(Five) Since wood is processed one by one, it cannot be bent efficiently and continuously. For this reason, processing cost is high and it is difficult to mass-produce cheaply.
[0006]
For the above reasons, the conventional bending method is remarkably limited in the degree of freedom of the shape to be bent, and it is difficult to industrially mass-produce in terms of production efficiency, and it is manufactured by a handicraft method such as a so-called chair. What is being done is
[0007]
The present invention was developed for the purpose of overcoming the conventional drawbacks, and an important object of the present invention is that the wood to be bent is not specified as a flat shape, and various cross-sectional shapes of wood are obtained in various shapes. Bending of wood that can be bent into a large amount, effectively preventing breakage by bending while accurately controlling the elongation of the wood, and bending the wood while mass-producing extremely efficiently and inexpensively Processing equipment Is to provide a place.
[0008]
[Means for Solving the Problems]
Book The wood bending apparatus according to the present invention includes a bending die 1 having a forming path 2 in which a rod-like or plate-like wood W having a constant cross-sectional shape is inserted and bent, and the forming path 2 of the bending die 1 includes wood. The propulsion mechanism 3 that presses and inserts W and the tip of the wood W inserted into the molding path 2 of the bending mold 1 are pressed by the propulsion mechanism 3 to restrict the movement of the wood W along the molding path 2. A movement restriction mechanism 4. While the propulsion mechanism 3 pushes the wood W into the forming path 2 of the bending mold 1, the movement restricting mechanism 4 presses the tip of the wood W to form the material while restricting the elongation amount of the wood W to be bent. Drain from path 2.
[0009]
In the bending apparatus of the present invention, the movement restriction mechanism 4 is moved in synchronization with the propulsion mechanism 3 to move the wood W. Restrict. The propulsion mechanism 3 uses a propulsion piston 6 that inserts the molding path 2 and presses the wood W. Use. Further, in the molding path 2 of the bending mold 1, the portion where the propulsion piston 6 inserts the wood W can be made linear. The forming path 2 of the bending mold 1 can have a shape having an arc portion for forming the wood W into an arc shape.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a wood bending method and a bending apparatus for embodying the technical idea of the present invention, and the present invention does not specify the method and apparatus below.
[0011]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0012]
In the wood bending method of the present invention, rod-like or plate-like wood having a constant cross-sectional shape is pressed by a propulsion mechanism and inserted into a forming path of a bending mold, and the wood is bent at the forming path. The amount of movement of the wood moving along the forming path is restricted by a movement restriction mechanism that presses the tip, and the amount of elongation of the wood that is compressed and bent is restricted to prevent breakage due to elongation.
[0013]
In the bending method of the present invention, rod-like or plate-like wood having a substantially constant cross-sectional shape is used as the wood to be treated. The cross-sectional shape of the wood may be any shape such as a square, a rectangle, a circle, an ellipse, and a rhombus. In addition, the wood whose cross-sectional shape is substantially constant can be easily bent by providing vertical grooves along the direction corresponding to the inner periphery of the bending, for example. The wood to bend is beech, oak, tamo, elm, sharpness, larch, oak, white oak, red oak, ash, huckleberry, walnut, rubber, town, teak, mahogany, cocktan, rosewood, maple, cedar, cypress, etc. All wood that can be bent with can be used.
[0014]
The wood to be processed can be bent more smoothly by plasticizing. In the plasticizing treatment, the wood is heated to 100 to 180 ° C. to be plasticized. Wood can be plasticized by heating with water vapor, high frequency, microwave, or the like. The plasticizing treatment by heating is to soften the wood and make it easy to bend, but a method that can be plasticized by a method such as chemical treatment at room temperature can also be used. Wood can be plasticized and then inserted into a bending mold, or plasticized with a bending mold. The wood that has been plasticized by heating is inserted into a forming path and bent. The wood molded in the molding path can be cooled in the molding path and held in the molded state. Moreover, it can extrude from a shaping | molding path, can be put into another shape-holding metal mold | die, can be cooled, and can be shape-retained in a molding state.
[0015]
The plasticized or unplasticized wood is pressed in the fiber direction by the propulsion mechanism and inserted into the forming path of the bending mold. The propulsion mechanism can use a propulsion piston that presses wood from behind. However, all the mechanisms that can press the wood and insert it into the molding path, such as a mechanism that inserts the pressing part at the end of the arm into the molding path of the bending mold and presses the wood with the pressing part of the arm and inserts it into the molding path. be able to. In the present invention, while pushing the wood with the propulsion mechanism, the tip of the wood is pushed with the movement restriction mechanism to limit the extrusion amount. For this reason, as the propulsion mechanism, one having a pressing force capable of inserting the forming path of the bending mold while compressing the wood in the fiber direction while restricting the extrusion by the movement restriction mechanism is used.
[0016]
The propulsion mechanism presses the wood in the vertical direction and inserts it into the forming path of the bending mold. The bending mold has the same cross-sectional area as the cross-sectional shape of the wood. This bending die can be prevented from buckling due to a partial split in the lateral direction of the wood inserted into the forming path. However, since the bending conditions vary depending on the wood species, plasticization state, shape, etc., the cross-sectional shape of the wood and the cross-sectional shape of the forming path are not necessarily the same. The cross-sectional shape of the forming path may be larger or smaller than the cross-sectional shape of the wood.
[0017]
The propulsion mechanism uses a propulsion piston that presses the wood from the rear end while moving along the molding path. The propulsion piston uniformly presses the entire rear end of the wood and pushes the wood into the forming path of the bending mold. The drive mechanism that pushes the propulsion piston and moves it to the molding path is not specified, but the drive mechanism should be a hydraulic cylinder, an electric cylinder, a combination of a rack and pinion, or a mechanism that combines a screw rod and a nut. Can do. A drive mechanism combining a rack and a pinion connects one end of the rack to the propulsion piston, moves the rack in the vertical direction with the pinion, and moves the propulsion piston along the forming path with the rack moving in the vertical direction. In a drive mechanism that combines a screw rod and a nut, a propulsion piston is connected to one end of the screw rod, and the nut is rotated by a motor or the like to move the screw rod in the vertical direction. A longitudinally moving screw rod moves the propulsion piston along the forming path.
[0018]
The above propulsion mechanism is suitable for pushing wood into a linear forming path. However, the propulsion mechanism can also push wood into the curved forming path. In this propulsion mechanism, the propulsion piston that moves along the molding path is moved by, for example, a drive mechanism including a drive arm. The drive arm of the drive mechanism is inserted into the molding path through a vertical slit provided along the molding path, and moves the propulsion piston at the tip. This driving arm is driven by a driving mechanism which is provided outside the molding path and rotates the arm, and moves the propulsion piston at the tip.
[0019]
Further, according to the present invention, wood can be bent into a three-dimensional shape such as a spiral shape. In this bending mold, a molding path into which wood is inserted has a three-dimensional shape. The propulsion piston that pushes wood into a molding path that is a three-dimensional solid shape has a straight portion or a three-dimensional solid shape where the wood is pushed. The linear forming path can push the wood with a propulsion mechanism including the cylinder, rack, screw rod and the like described above. In the three-dimensional three-dimensional molding path, wood can be pushed in by a propulsion mechanism that moves the propulsion piston at the tip of an arm inserted into the molding path from the slit. The propulsion mechanism is further moved in the axial direction of the spiral while rotating the arm, and moves the tip along the forming path.
[0020]
Furthermore, the propulsion mechanism is driven in a state where the wood is sandwiched from both sides, and a feed roller or a feed belt that pushes the wood into the forming path can also be used. A propulsion mechanism provided with a feed roller arranges a plurality of feed rollers in parallel on both sides of the wood. The plurality of feed rollers are arranged side by side in a direction in which wood can be moved to the forming path. The plurality of feed rollers are rotationally driven with the wood sandwiched from both sides, and push the wood into the forming path of the bending mold. In the propulsion mechanism including the feed belt, a feed belt having a structure in which a belt on an endless track is driven by a roller is arranged opposite to both sides of the wood. The pair of feed belts are arranged in such a direction that the straight portion of the belt of the endless track is in close contact with the side surface of the wood and that the wood can be transferred to the forming path by the moving belt. The pair of feed belts are driven in a state where the wood is sandwiched from both sides, and the wood is pushed into the forming path of the bending mold. Further, the propulsion mechanism may be a structure in which a propulsion piston, a feed roller, and a feed belt are combined.
[0021]
The movement restriction mechanism is provided so that a pusher portion for restricting the movement of the tip of the wood moving along the forming path can be moved to the forming path. The pusher portion moves along the forming path while pressing the tip of the wood, and restricts the movement of the wood. The wood that moves along the forming path while being pressed by the pusher portion is compressed without being stretched at all portions to be deformed, or the amount of stretch is limited to the extent that it does not break. In this state, the wood is moved to the forming path to prevent breakage due to the elongation of the outer periphery of the bent wood. Therefore, it is possible to efficiently perform bending while eliminating the breakage of the wood. In this method, the wood can be bent into various shapes with various cross-sectional shapes of the wood and the cross-section of the mold. Further, by sliding a molding path having a smooth surface, it is possible to manufacture a bent wood having a high surface quality and dimensional accuracy.
[0022]
The movement limiting mechanism can most effectively suppress the expansion of the pusher portion in the bending outer peripheral direction of the wood by synchronizing the pusher portion with the pushing mechanism pushing the wood. The movement limiting mechanism moved in synchronization with the propulsion mechanism makes the movement amount of the pusher portion equal to or less than the movement amount of the propulsion piston. However, the pusher portion moves together with the propulsion piston while keeping the outside of the wood to be bent to be unstretched, and inserts the wood into the forming path while keeping the wood in a compressed state. For this reason, the pusher portion is not moved until the propulsion piston pushes the wood into the molding path and the outer periphery of the wood to be bent is compressed to a compression rate that does not expand, and after this compression state, Move the pusher part so that the amount of movement is less than or equal to.
[0023]
In terms of specific numerical values, when bending a rod-like wood having a length and width of 40 mm × 40 mm and a length of 400 mm with a center radius of 200 mm, the outer periphery of the rod is stretched around the center radius portion. Assuming that compression acts on the inner peripheral side, an elongation of nearly 10% occurs in the outer peripheral portion, and the material breaks far beyond the elongation limit of wood. By the way, the elongation limit of wood is 1 to 2%. If the movement of the tip of the timber is restricted by the movement restriction mechanism so that the outer periphery of the bent wood does not stretch, the elongation of the outer periphery becomes less than the limit of the wood and the rupture does not break. When the movement restriction mechanism restricts the amount of movement of the wood tip and compresses the wood so that the outer circumference of the wood to be bent does not stretch, the inner circumference of the wood is compressed. The wood that has been compressed so that the outer periphery does not stretch is compressed to a maximum of about 20% in the inner peripheral portion to be bent, but there is no problem because the compression limit is not exceeded in this range. The maximum compression limit in the fiber direction of wood is about 30%. Therefore, it is possible to perform bending so that the inner circumference of the wood does not exceed the maximum compression limit, and the wood is not broken at a curvature radius that does not extend the outer circumference. The method in which the movement limiting mechanism can control the amount of compression of the wood in synchronization with the propulsion mechanism has the advantage that the wood can be bent by being compressed so that the inner circumference of the wood does not exceed the maximum compression limit.
[0024]
【Example】
4 and 5 show schematic conceptual views of the wood bending apparatus. This bending apparatus includes a propulsion mechanism 3 that pushes a rod-like wood W having the same cross-sectional shape into a forming path 2 of a bending die 1, a bending die 1 that bends the wood W into a predetermined shape, A movement restriction mechanism 4 for restricting the movement of the wood W so as to restrict the elongation of the processed wood W, and a propulsion mechanism 3 and a control circuit 5 for controlling the movement restriction mechanism 4 are provided.
[0025]
The propulsion mechanism 3 moves the linear portion 2A of the molding path 2 of the bending die 1 to press the rear end of the wood W, and inserts the wood W into the molding path 2 and the propulsion piston 6 And a drive mechanism 7 for driving. The drive mechanism 7 includes a drive cylinder 8 that moves the propulsion piston 6 to the molding path 2. The drive cylinder 8 is a hydraulic cylinder, and controls the amount of movement of the propulsion piston 6 by controlling the flow rate of hydraulic oil supplied to the hydraulic cylinder. The propulsion mechanism 3 extends the rod 8A of the drive cylinder 8 and pushes the propulsion piston 6 connected to the tip of the rod 8A into the molding path 2 of the bending die 1 to form the wood W with the propulsion piston 6. Push into road 2. The control circuit 5 detects the amount of displacement by which the propulsion piston 6 of the propulsion mechanism 3 moves by pushing the rear end of the wood W, and controls the operation of the movement limiting mechanism 4.
[0026]
The propulsion mechanism 3 can also be composed of a plurality of feed rollers 13 as shown in FIG. The plurality of feed rollers 13 are arranged in parallel on both sides of the wood W, and are rotated by a drive mechanism (not shown) to transport the wood W. The plurality of feed rollers 13 are in a posture orthogonal to the traveling direction of the wood W and are disposed in a direction in which the wood W can be moved to the forming path. The interval between the feed rollers 13 arranged opposite to both sides of the wood W is adjusted to be substantially equal to or slightly smaller than the thickness of the wood W. The propulsion mechanism 3 is configured such that each of the feed rollers 13 is indicated by an arrow in the drawing in a state where the wood W is sandwiched from both sides by a plurality of feed rollers 13, that is, in a state where the side surface of the wood W is pressed by the opposed feed rollers 13. Rotate in the direction shown to push the wood W into the forming path of the bending mold. The control circuit detects the amount of displacement of the rear end of the wood W and controls the operation of the movement limiting mechanism.
[0027]
Furthermore, the propulsion mechanism 3 can also be comprised with a pair of feed belts 14, as shown in FIG. The feed belt 14 shown in the figure has a structure in which an endless track belt 15 is driven by a roller 16, and is disposed opposite to both sides of the wood W. The pair of feed belts 14 are arranged in such a direction that the wood W can be transferred to the forming path by the driven belt 15. Further, the pair of feed belts 14 has the linear portion of the belt 15 stretched around the roller 16 in close contact with the side surface of the wood W. Therefore, the interval between the feed belts 14 arranged to face each other is adjusted to be substantially equal to or slightly smaller than the thickness of the wood W. The pair of feed belts 14 is driven in a state where the wood W is sandwiched between the opposite belts 15 to push the wood W into the forming path of the bending mold. The control circuit detects the amount of displacement of the rear end of the wood W and controls the operation of the movement limiting mechanism.
[0028]
As described above, the structure in which the wood W is pushed into the forming path by the feed roller 13 and the feed belt 14 moves the wood W while pressing the multiple sides or a wide area of the wood W with the roller or the belt. It has the feature that it can be pushed into the molding path without difficulty.
[0029]
Further, the propulsion mechanism may be a structure in which a propulsion piston, a feed roller, and a feed belt are combined. The propulsion mechanism shown in FIG. 8 has the propulsion mechanism 3 constituted by the feed roller 13 shown in FIG. 6 and the propulsion mechanism 3 constituted by the pair of feed belts 14 shown in FIG. A propulsion piston 6 that presses the rear end of the wood W is disposed on the rear end side. The propulsion piston 6 extends the rod 8A of the drive cylinder 8 that is the drive mechanism 7 and presses the rear end of the wood W. In the illustrated propulsion mechanism 3, the feed roller 13 is disposed on the side of the molding path (not shown), but the feed belt can also be disposed on the side of the molding path (not shown). The propulsion mechanism 3 presses the rear end of the wood W inserted into the forming path with the propulsion piston 6 and drives the feed roller 13 and the feed belt 14 to sandwich the wood W from both sides with these rollers and belt. Then, the wood W is pushed into the forming path. The propulsion mechanism 3 having this structure has an advantage that the wood W can be inserted into the forming path more ideally.
[0030]
The bending die 1 includes a forming path 2 into which the wood W is inserted. The forming path 2 shown in FIGS. 4 and 5 includes a straight portion 2A and a curved forming portion 2B for bending the wood W with a predetermined radius of curvature. The bending die 1 having the straight portion 2A in the forming path 2 can push the wood W into the forming path 2 by inserting the propulsion piston 6 into the straight portion 2A. In the bending die 1 of FIG. 4, the curvature radius of the curved forming portion 2B is constant. The bending mold 1 of FIG. 5 has a curved radius of the curved molding portion 2B that is partially different. The bending mold 1 shown in FIGS. 4 and 5 can harden the wood W inserted into the curved forming portion 2B by allowing it to stand for a certain period of time and bending it. The bending die 1 in FIG. 4 can also be bent by extruding the wood W from the curved forming portion 2B. The wood W pushed out from the curved forming portion 2B is put into a shape-holding mold for a certain period of time and is held in a shape that has been formed. The method of putting the wood W bent into the forming path 2 and curing it so as not to deform can bend the wood W into various shapes.
[0031]
In a wood bending apparatus in which the propulsion mechanism is configured by a feed roller or a feed belt, it is not always necessary to provide a straight portion on the forming path of the bending mold. This is because the feed roller and the feed belt can be arranged near the entrance of the bending portion of the bending mold so that the wood can be pushed directly into the bending portion. However, the wood bending apparatus can also provide a straight portion in the forming path of the bending mold and push the wood into the straight portion of the forming path with a feed roller or a feed belt.
[0032]
The movement restriction mechanism 4 includes a pusher unit 9 that presses and compresses the tip of the wood W. In the illustrated movement restriction mechanism 4, a pusher portion 9 is provided at the tip of the braking arm 10, and the braking arm 10 is connected to the braking mechanism 11. The pusher portion 9 has the same shape as the inner shape of the molding path 2 so that the front end surface of the wood W can be pressed. It has a small outer shape. The outer shape of the pusher portion 9 is not provided with a gap through which the wood W is pushed out between the pusher portion 9 and the molding path 2. This is because if there is a wide gap here and the wood W is pushed into the gap, the tip of the wood W will break. The gap between the pusher portion 9 and the molding path 2 is preferably 0.2 to 5 mm. In such a gap, the pressed wood W is not pushed into the gap.
[0033]
The brake arm 10 has a tip inserted into the molding path 2 from a vertical slit 12 provided along the inside of the molding path 2 of the bending mold 1. The brake mechanism 11 is controlled by the control circuit 5 to control the rotation of the brake arm 10. The brake mechanism 11 is a servo motor or a hydraulic mechanism controlled by the control circuit 5 and rotates the brake arm 10 in synchronization with the propulsion mechanism 3. The movement restriction mechanism 4 restricts the movement of the wood W in synchronization with the propulsion mechanism 3. The control circuit 5 controls the rotation of the brake arm 10 so that the wood W inserted into the curved forming portion 2B does not extend on the outer peripheral side, and presses and compresses the tip of the wood W with the pusher portion 9.
[0034]
The bending mold 1 shown in FIG. 5 has a structure in which the bending portion 2B of the forming path 2 has partially different radii of curvature, so that the braking arm 10 can be expanded and contracted in the axial direction. The brake arm 10 expands and contracts to move the pusher portion 9 along the curved forming portion 2B having a different curvature radius.
[0035]
The control circuit 5 drives the propulsion mechanism 3 and the movement restriction mechanism 4 in synchronization. For example, the control circuit 5 moves the propulsion piston 6 of the propulsion mechanism 3 at a constant speed and controls the movement of the pusher portion 9 of the movement limiting mechanism 4 so as to synchronize with the displacement amount. At this time, the amount of movement of the pusher portion 9 of the movement restriction mechanism 4 is controlled so that all the parts of the wood W are not expanded. The above bending apparatus can control the moving distance of the pusher portion 9 so that the elongation of the wood W inserted into the forming path 2 of the bending die 1 can be reliably prevented.
[0036]
However, the bending apparatus of the present invention uses the movement restriction mechanism 4 to press the tip of the wood W moving on the forming path 2 with a predetermined pressure to restrict the movement of the wood W so that it does not stretch. You can also The movement restriction mechanism 4 brakes the rotation of the brake arm 10 and the pusher portion 9 presses the tip of the wood W to restrict the movement of the wood tip. If the pressure by which the pusher portion 9 presses the tip of the wood is increased, the elongation of the wood W decreases, and if the pressure to be pressed is decreased, the elongation of the wood W increases. When the braking force of the rotation of the braking arm 10 is increased, the pressure with which the pusher portion 9 presses the wood tip increases. Therefore, the brake mechanism 11 can control the rotational braking force of the brake arm 10 and the pressure by which the pusher portion 9 presses the tip of the wood can be adjusted so that the wood W does not stretch.
[0037]
The movement restricting mechanism 4 in which the pusher unit 9 presses the wood tip with a predetermined pressure and restricts the movement of the wood tip can partially change the rotational braking force of the brake arm 10. The pusher portion 9 can first press the tip of the wood with a strong pressure, and thereafter can reduce the pressing pressure. This is because the frictional resistance between the wood W and the curved molded portion 2B increases as the wood W is inserted into the curved molded portion 2B. The frictional resistance between the wood W and the curved molded portion 2B limits the movement of the wood W. For this reason, the movement of the wood W is limited as the wood W is inserted deeply into the curved forming portion 2B. The movement of the tip of the wood W is limited by both the frictional resistance with the curved forming portion 2B and the pressure pressed by the pusher portion 9. For this reason, the pusher portion 9 first presses the wood W with a strong pressure with a low frictional resistance, and as the frictional resistance increases, the pressure at which the pusher portion 9 presses the wood W is lowered, The portion, that is, the outer side to be bent can be inserted into the curved molded portion 2B while being compressed so that it does not stretch.
[0038]
The above bending apparatus bends the wood W in the following steps.
The wood W to be inserted into the bending die 1 is heated to 100 to 180 ° C. and plasticized as a previous step. The wood W can be heated to 100 ° C. or higher by heating in an airtightly sealed pressure chamber, that is, by autoclaving.
[0039]
The pusher portion 9 is disposed at the tip of the curved molding portion 2B, and the wood W plasticized by the propulsion mechanism 3 is inserted into the molding path 2 of the bending die 1. When the tip of the wood comes into contact with the pusher portion 9 of the movement restricting mechanism 4, the pusher portion 9 further pushes the wood W by the propulsion mechanism 3 while pressing the tip of the wood with a predetermined pressure or restricting the movement of the pusher portion 9. It is pushed and inserted into the curved forming part 2B. At this time, the movement restriction mechanism 4 controls the movement amount of the pusher portion 9 or the wood pressing force so that the outer periphery of the wood W to be bent does not extend. The wood W is inserted into the curved forming portion 2B while being compressed by the pusher portion 9 of the movement restricting mechanism 4 so that the outer periphery to be bent does not extend, in other words, all the portions do not extend. The movement restricting mechanism 4 can also insert the wood W into the curved forming portion 2B by moving the pusher portion 9 after compressing the wood W so that the outer periphery does not extend even when the wood W is bent.
[0040]
The wood W inserted into the curved forming portion 2B is bent here. The wood W inserted into the curved forming portion 2B is cooled by being left standing in the curved forming portion 2B, and is held in a bent state. However, the wood W can be extruded from the curved molding portion 2B while being compressed, and the extruded wood W can be placed in a shape-retaining mold to be cooled and retained.
[0041]
【The invention's effect】
Wood processing of the present invention apparatus Does not specify the wood to be bent into a flat shape, and can bend the wood having various cross-sectional shapes into various shapes. In addition, bending can be effectively prevented by bending while accurately controlling the amount of elongation of the wood. It also has the advantage of being able to mass-produce bent wood very efficiently and inexpensively. It is the wood processing of the present invention apparatus However, a rod-shaped or plate-shaped wood is pushed by a propulsion mechanism and inserted into a forming path of a bending mold, and the wood is bent by this forming path, and the tip of the wood is pressed by a movement limiting mechanism to move the forming path. This is because the bending is performed by compressing the wood to be bent and limiting the amount of elongation of the outer periphery of the wood.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a conventional wood bending method.
FIG. 2 is a schematic view showing another conventional wood bending method.
FIG. 3 is a schematic view showing another conventional wood bending method.
FIG. 4 is a schematic conceptual diagram of a wood bending apparatus according to an embodiment of the present invention.
FIG. 5 is a schematic conceptual diagram of a wood bending apparatus according to another embodiment of the present invention.
FIG. 6 is a schematic sectional view showing another example of the propulsion mechanism.
FIG. 7 is a schematic sectional view showing another example of the propulsion mechanism.
FIG. 8 is a schematic sectional view showing another example of the propulsion mechanism.
[Explanation of symbols]
1 ... Bending mold
2 ... Molding path 2A ... Straight line part 2B ... Curved molding part
3 ... Propulsion mechanism
4 ... Movement restriction mechanism
5 ... Control circuit
6 ... Propulsion piston
7 ... Drive mechanism
8 ... Drive cylinder 8A ... Rod
9 ... Pusher part
10 ... Brake arm
11 ... Brake mechanism
12 ... Vertical slit
13 ... feed roller
14 ... Feed belt
15 ... Belt
16. Roller
21 ... Bending mold
22 ...
23. Roller
24 ... Inner mold
25 ... Female type
26 ... Male
W ... wood

Claims (7)

Bending mold (1) having a molding path (2) for inserting and bending rod-shaped or plate-shaped wood (W) having a constant cross-sectional shape, and a molding path (2) of this bending mold (1) The propulsion mechanism (3) that presses and inserts the wood (W) into the press, and the propulsion mechanism (3) presses the tip of the wood (W) that is inserted into the forming path (2) of the bending mold (1). A movement restriction mechanism (4) for restricting movement of the wood (W) in the molding path (2),
Travel limiting mechanism (4), together with the synchronization to the propulsion mechanism (3) to limit movement of the timber (W), comprising a propulsion propulsion mechanism (3) is a piston (6), the movement limiting mechanism of the tip of the timber It moves along the molding path while pressing, and has a pusher part that restricts the movement of wood,
The movement limiting mechanism that is moved in synchronization with the propulsion mechanism controls the movement amount of the pusher part to be equal to or less than the movement amount of the propulsion piston,
The wood to be bent while the propulsion mechanism (3) pushes the wood (W) into the forming path (2) of the bending mold (1) and the movement restriction mechanism (4) presses the tip of the wood (W). Bending of wood that is compressed so that the inner circumference does not exceed the maximum compression limit and discharged from the molding path (2) while limiting the elongation on the elongation side of (W) to an extent that does not break apparatus. The propulsion mechanism (3) is provided with a propulsion piston (6), and the forming path (2) of the bending die (1) has a straight portion where the wood (W) is inserted in the propulsion piston (6). 1. A bending apparatus for wood described in 1 . The wood bending apparatus according to claim 1 , wherein the forming path (2) has an arc portion for forming the wood (W) into an arc shape. Movement restriction mechanism (Four) But wood (W) Pusher part that compresses by pressing the tip (9) Brake arm with a tip (Ten) A wood bending apparatus according to claim 1. Brake arm (Ten) But bending mold (1) Molding path (2) Vertical slit provided along the inside (12) From the tip to the molding path (2) The wood bending apparatus according to claim 4, wherein the wood bending apparatus is inserted into the wood bending apparatus. wood (W) However, the braking arm (Ten) The rotation of the pusher (9) In wood (W) The wood bending apparatus according to claim 4, wherein the tip is pressed and compressed. The wood bending apparatus according to claim 1, wherein the propulsion mechanism has a structure in which a propulsion piston is combined with a feed roller or a feed belt.

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