JPH0420567Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (industrial application field) This invention is useful in the woodworking, furniture, musical instrument industries, etc.
A bent wood device that bends materials to obtain products. More specifically, the present invention relates to a device that applies hydraulic pressure to a movable end stop to provide appropriate resistance to the elongation of the material during bending, thereby easily manufacturing high-quality bent wood products that do not buckle or crack.

(Prior Art) A bent wood device conventionally used in the woodworking, furniture, musical instrument industries, etc., has a butt end stop 31, which corresponds to the end of the material, fixed to a material support 30 as shown in FIG.
This end stop 31 suppresses the elongation of the outer surface of the material during bending, exerts a compressive force, and prevents the occurrence of cracks on the outer surface. Therefore, before the start of bending,
The butt end stop 31 must be fixed at a position away from the end of the butt by the predicted elongation dimension so that when the material stretches and hits it, an appropriate compressive force will be generated. This is extremely difficult and can only be done by experts with sufficient experience, and it is even said that no two pieces of wood have the same properties, even by experts. It is impossible to apply compressive force, and the setting position is too far away, resulting in insufficient compressive force and cracks.
Because they were too close together, the compressive force became excessive, causing problems such as buckling.

The present invention was developed to solve the above-mentioned conventional problems, and by making the end stop movable and pressing it against the end of the material using hydraulic pressure, it provides resistance to the elongation of the material due to bending. The object of the present invention is to provide a bent wood device that automatically generates an appropriate compressive force at all times and does not cause defects such as cracks and buckling in the product.

B. Structure of the invention (means for solving problems) The means of the invention to achieve the above object is to support the material with a jig whose shape matches the internal shape of the product, a band and a butt end. In a bent wood device comprising a material support means and a pressure means for bending the material to the jig, the end stop of the material support is made movable and pressed against the end of the material by hydraulic pressure. The structure of the bentwood device is characterized by:

(Function) In the bent wood device configured as described above, when the material supports 14, 14 are held horizontally,
Material 13 softened by appropriate treatment on top of the band 15
, put the butt ends 23, 23 on both ends of this material 13, and press the end stops 23, 23 against the ends using the hydraulic cylinders 21, 21. 3, the material supports 14, 14 are gradually deformed into an inverted V-shape in response to this, and the material 13 is pressed against the jig 6 while changing the contact point with the material 13. It can be easily finished into a bent wood product 5 as shown in FIG. 5, which has an inner shape of The butt ends 23, 23, which receive the hydraulic pressure, change their positions according to the elongation of the material and continue to apply compression force by providing resistance to the ends of the material, so the material 13 does not suffer from cracks on the outer surface due to insufficient compressive force. The curved wood product 5 is finished with a good surface condition that does not cause buckling of the inner surface due to excessive compressive force.

(Example) An example of a bent wood device according to the present invention will be described below based on the drawings.

In each of the drawings, 1 is a machine base, and a vertical guide 2 is provided on the rear side of the center of the machine base, and a lifting plate 4 that is raised and lowered by a hydraulic cylinder 3 is engaged with this vertical guide 2, and a product 5 is mounted on this vertical guide 2. Attach the jig 6 that matches the internal shape,
A pair of horizontal guides 7, 7 are provided on both sides of the front of the machine base 1, and feed screws 8, 7 are attached to these guides 7, 7, respectively.
The movable plates 9, 9 which are moved forward and backward by the movable plates 9, 9 are engaged with each other.
with the hydraulic cylinders 11, 11 for angle adjustment
and slide bases 12, 12 are pivotally attached to the upper ends of the swing arms 10, 10, respectively, and supports 14, 1 of material 13 are connected to each slide base 12, 12.
A strap 15 is placed on both supports 14, 14 so as to straddle them, and clasps 16, 16 provided at both ends of this strap 15 are attached to the supports 1.
4, 14, and adjust the slide bases 12, 12 and the ends of the supports 14, 14 by adjusting screws 18, 18, which correspond to changes in length.
18 are connected by hydraulic cylinders 19, 19, and the hydraulic pressure supplied to the cylinders 19, 19 applies a tensile force to the band 15 during bending, so that the band 15 does not loosen. At the same time, a water-resistant sheet 20 made of synthetic resin or the like is laid on the strap 15 to prevent the material 13 from getting dirty, and a hydraulic cylinder is placed on the outer end of the supports 14, 14, respectively. The end stops 23, 23 of the material 13 attached to the rods 22, 21 of 21, 21 are provided, and during bending, they are pressed against the end of the material 13 by hydraulic pressure, providing resistance to the elongation of the material, and automatically applying an appropriate compression force. It is set so that it occurs.

24, 24 are the supports 14, 14 made of the above-mentioned material.
The chain wheel 26 is a hydraulic cylinder that provides a force to counter the pressing force of the jig 6, and is fixed to the bearings 25 of the slide bases 12, 12, and the swing arm 10.
The chain wheel 28 fixed to the bearing part 27 of
4 is pressed down by the jig 6 that is lowered into the cylinder 3, a force opposite to that of the jig 6 is applied to the supports 14, 14 to ensure that the bending process of the material 13 is performed. It is something.

Note that the structure in which the butt end stop of the present invention is made movable and is pressed against the end of the wood by hydraulic pressure is not limited to the above-mentioned embodiment in which the jig 6 is operated by the cylinder 3, but also the jig pressing type using a lever of the material shown in the past, and Although the present invention is also applicable to other types of systems, drawings and explanations regarding these will be omitted.

In the bent wood device shown in the above embodiment, the material 13 that has absorbed water on one side is wrapped in a watertight membrane, heated to 100°C by microwaves, and then taken out from the watertight membrane and the straps 15 of the supports 14, 14 are wrapped. A synthetic resin sheet 20 is spread and placed on top, a pressure of 20 kg/cm ² is applied to the end stops 23, 23 by the cylinders 21, 21, and a tension is applied to the strap 15 by the cylinders 21, 21 to the extent that it does not elongate. Place it on cylinder 3.
The jig 6 was lowered. In response to this, the supports 14, 14 are applied resistance by the cylinders 24, 24, open in a V-shape, and the contact point with the outer surface of the material 13 is gradually moved upward, while the material 13 is moved to the jig. 3, and the material 13 expands accordingly. If the butt ends 23, 23 are of a constant pressure type, the hydraulic pressure is maintained by a pressure regulating valve (not shown in the drawing), so 20 kg/cm ² is press-fitted into the ends. By continuing to apply this to provide resistance to elongation and to ensure that an appropriate compressive force is always applied to the material, bending a 2m long material into a horseshoe shape can be completed in about 1 minute, and there will be no cracks or buckling on the surface of the product. No other defects were found.

In addition, while bending the material 13, the pressure of the end stop 23 was adjusted so as to increase stepwise as the amount of bending increased, but this seemed to be more effective than constant pressure compression.

C. Effects of the invention As mentioned above, the bending device of the present invention uses hydraulic pressure to press the end stop of the material against the end of the material, and during the bending process, constant resistance is applied to the end of the material to ensure appropriate compression. Because it generates force, even inexperienced people can easily manufacture high-quality bent wood products that do not have defects such as cracks or buckling on the surface of the material, making it possible to spread bent wood processing widely to the general public. In addition, pressing by hydraulic pressure can be varied in various ways, such as holding the pressure constant, increasing it stepwise or steplessly, increasing it proportionally, etc., depending on the material type, product shape, and other conditions. The variable compression force can be adjusted arbitrarily by selecting a known automatic valve, and it has the unique effect of easily manufacturing bent wood products free of defects such as cracks and buckling for all materials and products. .

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the implementation of a bentwood device according to the present invention. Figure 2 is a side view of the same as above. FIG. 3 is an enlarged view showing the end stop and pressurizing means same as above. FIG. 4 is a rear view showing the state in which the chain and cylinder that provide resistance to the same material support are attached. FIG. 5 is a perspective view of a product manufactured according to the above method. FIG. 6 is a schematic front view of a conventional bentwood device. In the figure, 6 is a jig, 15 is a strap, 23, 23
is a wood end stop, 14, 14 is a material support means, 21,
21 is a liquid pressing means.

Claims (1)

[Scope of utility model registration request] A bending wood device comprising a jig having a shape that matches the internal shape of a product, a support means for supporting the material with a strap and a butt end stopper, and a pressure means for bending the material onto the jig. , the end stop of the support made of the above-mentioned material,
A bentwood device characterized in that it is movably supported on a support and pressed against the end of the wood by hydraulic pressure.