JPH10248645A - Table top - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table top capable of lightening weight, improving waterproofness, securing screw retentiveness and further, improving vibration absorption so that the table top can lead to reducing vibration and noise. SOLUTION: This table top 1 for an embroidery-sawing machine has a five layered construction made of a foamed plastic board 2, MDF boards 3 and melamine resin overlayed decorative boards 4. The table top 1 is light, for the same is made of foamed plastic board 2, which does not have fear to be cambered by the directionality weaker than laminated wood and is highly water resistant. The MDF board 3 is not elastically deformed that screws 10 are not loosened from bite-in of the screws and the MDF board 3 contributes greatly to the screw retentiveness of the whole table board 1. The vibration and noise reduction of the embroidery-sawing machine is attributed to the improvement in the vibration absorption achieved by combination of three of the foamed plastic board 2, the MDF board 3 and the melamine resin overlayed decorative board 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table plate which can be used for various tables (for example, tables in sewing machines, desks, wheelchairs, nursing beds, baby chairs, vehicle seats, etc.) and is particularly suitable for sewing machine tables.

[0002]

2. Description of the Related Art Conventionally, a plywood table board 50 as shown in FIG. 7 has been used for a table of an embroidery sewing machine shown with reference to FIG. This plywood table board 50
Although the surface material 52 is joined to the upper and lower surfaces of the plywood 51, there are the following problems.

[0003] The plywood table board 50 is generally heavy because it uses thick plywood, and is difficult to handle until it is fixed to the frame 7 of the embroidery sewing machine. In addition, as shown by a two-dot chain line in FIG. 2, a large power is required to move the elevating unit 6 up and down. In particular, when the number of embroidery heads is large, and therefore the area of the elevating unit 6 is large, a burden is imposed on the operator when raising and lowering the elevating unit manually, and a large elevating mechanism is required when moving the elevating unit electrically. Was.

The plywood 51 does not have sufficient vibration absorption,
The vibration of the embroidery sewing machine and the noise caused by the vibration could not be sufficiently suppressed. Imported timber is often used as a material for the plywood 51, but local deforestation is progressing, and thus there is a problem of environmental conservation. Furthermore, at present, it is difficult to obtain high quality trees, and even medium quality or lower trees have to be adopted. Plywood processed from such low quality imported wood is easy to absorb water and warps due to drying after processing.

Therefore, the present inventor paid attention to using a foamed resin plate in order to reduce the weight, improve the water resistance, and prevent warpage without using plywood.

[0006]

However, the foamed resin plate has a problem that wood screws are easily pulled out. The wood screw 53 used to fix the conventional plywood table board 50 to the frame 7 is easily screwed from the plywood table board 50 by a screwing portion 54 which is screwed vertically into the plywood 51 and is caught by the bite. Is held so as not to fall out. However, when the wood screw 53 is screwed into the foamed resin plate, when the wood screw is pulled, the foamed resin around the wood screw 53 is easily elastically deformed so as to be disengaged from the screw portion 54, and the wood screw 53 is easily pulled out. is there.

Therefore, the present inventor has studied the use of a wood board together with a foamed resin board within a necessary and sufficient range for holding a wood screw. In addition to the above-mentioned plywood, wood board types include particle board obtained by applying an adhesive to wood chips and crushed pieces and hot-press molding; wood and plant fibers are finely spread and mixed with an adhesive. There is a molded fiber board. Since both boards have no direction, there is no need to worry about warping like plywood. In addition, the fiber board is more preferable than the particle board which easily absorbs and expands in water because of its high water resistance. Fiberboards are classified into three types according to their density.
The insulation board of low density ^{(0.25g / cm 3 ~0.50g / cm} 3) insufficient strength, heavy in hardboard high density ^{(0.80g / cm 3 ~1.05g / cm} 3) . Therefore, the present inventor has proposed that the medium density (0.
^{53g / cm 3 ~0.80g / cm 3} ) MDF board (m
edium density fiberboard,
Medium fiberboard).

However, according to the study by the present inventor, there is a problem that the vibration absorption cannot be improved simply by using the foamed resin plate and the MDF plate together, as will be apparent from the test results described later.

Therefore, an object of the present invention is not only to reduce the weight, improve the water resistance, and prevent the warpage without using plywood, but also to ensure the wood screw holding force and to further improve the vibration absorption. It is an object of the present invention to provide a table plate that can be improved to reduce vibration and noise.

Japanese Patent Application Laid-Open No. 57-96851 discloses a low foam plastic coated thick plate in which the outside of a fiber board is coated with a foamed resin. The thick plate is used for building, civil engineering and the like. It is used for applications and not only has a different technical field from the present invention, but also aims to improve weather resistance, water resistance, chemical resistance, concrete releasability, and the like. Absorbability).

Further, Japanese Utility Model Laid-Open No. 3-98241 discloses that
Although an interior composite panel in which a foamed resin plate and a thermosetting resin plate are laminated is disclosed, the composite panel is used for a wall surface or the like as an interior material, and differs from the present invention only in the technical field. However, it is intended to prevent warpage, peeling, cracks, and the like, and does not suggest the objects and effects of the present invention (particularly, vibration absorption and wood screw holding power).

[0012]

In order to achieve the above object, a table board of the present invention has the following constitutions (1) to (4). (1) A table plate in which at least one foamed resin plate, at least one MDF plate, and at least one thermosetting resin plate are laminated.

(2) At least one foamed resin plate at the center in the thickness direction, at least one upper MDF plate and at least one lower MDF plate superposed on the upper and lower surfaces of the foamed resin plate, and at least one lower MDF plate. A table board in which a thermosetting resin plate is stacked on at least one of the upper surface of the MDF plate or the lower surface of the lower MDF plate.

(3) At least one layer of M at the center in the thickness direction
A DF plate, at least one upper layer foam resin plate and at least one lower layer foam resin plate superimposed on the upper and lower surfaces of the MDF plate, and the upper surface of the upper layer foam resin plate or the lower surface of the lower layer foam resin plate And a thermosetting resin plate laminated on at least one of the above.

(4) A foamed resin plate and an MDF plate which are alternately stacked so as to have five or more layers, and a thermosetting resin plate which is stacked on at least one of the upper surface and the lower surface of the stacked products. Table board.

Here, examples of the “foamed resin plate” include polyethylene, polypropylene, polyvinyl chloride,
Polystyrene, ethylene-vinyl acetate copolymer resin, polyamide, polyethylene terephthalate, polyurethane,
Thermoplastic resin foam such as polyacrylic resin, polycarbonate, ABS resin, phenolic resin, epoxy resin,
A thermosetting resin foam plate such as a urea resin or a silicone resin may be used. Among these, a polyolefin resin foam plate such as polypropylene and polyethylene is preferable. Examples of commercially available products include “PARONIA” and “PARONIA SUPER”, trade names of Mitsui Toatsu Platec Co., Ltd.

The density of the foamed resin plate depends on the resin used, but is preferably 0.05 g / cm ^{3 to} 0.6 g / cm ³ . More preferably, 0.2 g / cm ^{3 to} 0.6 g /
cm ³ . Is less than 0.05 g / cm ³ to insufficient strength of the table plate, because heavy exceeds 0.6 g / cm ^3.

The thickness of the foamed resin plate is not particularly limited,
Usually, those having a size of 5 mm to 50 mm are used. If it is less than 5 mm, the strength such as the surface rigidity of the table decreases, and the
There are few uses beyond. When it is difficult to manufacture a thick foamed resin plate, a thin foamed resin plate can be stacked in two or more layers.

The method for producing the foamed resin plate is not particularly limited, and may be one produced by a known production method. For example, a method of molding the resin containing a foaming agent by an extrusion foaming method, a bead foaming method, a foam injection molding method, an in-mold foam molding method, or the like can be used.

The thickness of the "MDF plate" is not particularly limited, but is preferably 2.5 mm to 30 mm. If it is less than 2.5 mm, the wood screw holding power is insufficient, and if it exceeds 30 mm, it becomes heavy. Examples of commercially available products include “Starwood TL” and “Starwood TLM” (trade names of Hokushin Co., Ltd.).

Examples of the "thermosetting resin decorative board" include a melamine resin decorative board, a dup resin decorative board, a phenol resin decorative board and the like. The thickness of the thermosetting resin decorative board is 0.4
~ 2.5 mm is preferred. If the thickness is less than 0.4 mm, the improvement of the vibration absorption property is insufficient or the strength such as the surface rigidity of the table plate decreases, and if the thickness exceeds 2.5 mm, the weight becomes heavy. Commercially available products include “Decolux”, a product name of Nippon Decolux Co., Ltd.

The method of manufacturing the thermosetting resin decorative board may be a known manufacturing method. For example, a melamine resin decorative board is prepared by impregnating melamine resin in kraft paper or the like and drying it, and coating a phenol resin with kraft paper. A plurality of coated papers impregnated in paper or the like and dried are superposed, pressed and heated to form a laminate. In addition, the decorative resin plate is formed by laminating a plurality of coated papers obtained by impregnating a dup resin with kraft paper or the like, and drying, applying pressure, heating and laminating. Similarly, a phenolic resin decorative board is formed by laminating a plurality of coated papers obtained by impregnating a phenolic resin with kraft paper or the like, and then drying and applying pressure and heating.

The joining method between the foamed resin plate, the MDF plate and the thermosetting resin decorative plate may be a known method.
Adhesive bonding, hot melt bonding, heat welding and the like can be mentioned. In the case of adhesive bonding, the adhesive used may be a known adhesive. For example, an adhesive such as an epoxy-based, rubber-based, polyurethane-based, or polyvinyl acetate-based adhesive may be used. Also,
A known joining method may be used. For example, there is a method in which an adhesive is applied to a foamed resin plate, an MDF plate and a thermosetting resin decorative plate, laminated in a predetermined configuration, pressed, and if necessary, heated to form a bonding layer.

In the case of hot melt bonding, a known hot melt agent may be used. For example, polyamide-based,
EVA-based, polyester-based, rubber-based hot melt agents, and the like. Also, the joining method may be a known joining method. For example, there is a method in which a hot melt is heated and melted, applied to a foamed resin plate, an MDF plate, and a thermosetting resin decorative plate, laminated in a predetermined configuration, and pressed to form a bonding layer. There is also a method of laminating a film-like hot melt agent in a predetermined configuration and irradiating a high frequency while applying pressure to form a bonding layer.

When a thermoplastic resin foam plate is used as the foamed resin plate, a heat welding method can be used.
You may join between DF board or thermosetting resin decorative board.

The table board of the present invention is particularly useful as a table board for a sewing machine. The table plate for the sewing machine needs not only a light weight for the above-mentioned reason but also a sufficient wood screw holding force because it is fixed to the frame with a wood screw. Furthermore, since the machine head that vibrates violently is installed on the table plate for the sewing machine, sufficient vibration absorption is required.
Therefore, the table board of the present invention, which has excellent light weight, wood screw holding power, and vibration absorbing property, is particularly suitable for a table board for a sewing machine. Applicable sewing machines include sewing machines for embroidery, knitting, scooping, face-down sewing, with buttons, drilling, basting sewing, gloves, athletic shoes, leather, fur, hats Various sewing machines such as a sewing machine, a bag making machine, and a bookbinding machine can be exemplified.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The table board 1 of the first embodiment shown in FIG. 1 is manufactured by Mitsui Toatsu Platec Co., Ltd. under the trade name “PALONIA” (thickness 10 mm, density 0.28 g / c).
m ³⁾ foam using a resin plate 2 in the thickness direction center consisting of, the upper and lower surfaces of the foamed resin sheet 2, trade name HOKUSHIN Inc. "Starwood TLM" (thickness 4 mm, density 0.7g
/ Cm ³ ) of the upper layer and the lower layer of the MDF plate 3 each bonded by an epoxy-based adhesive and laminated.
On the upper surface of the F plate 3 and the lower surface of the lower MDF plate 3, a 1 mm thick melamine resin decorative plate 4 made of Nippon Decolux Co., Ltd. having a trade name of “Decolux” is bonded and laminated with an epoxy-based adhesive, The obtained five-layer structure bonding plate is cut into a predetermined shape.

The table plate 1 is used for a table of an embroidery sewing machine 20 as shown in FIG.
And a lifting unit 6 of a table which can be moved up and down as shown by a two-dot chain line in FIG. The edge processing of the table board 1 and the configuration of the embroidery sewing machine itself are not directly related to the present invention, and thus description thereof is omitted.

To fix the table 1 to the steel frame 7 of the embroidery sewing machine, a wood screw 10 having a head 11 and a screw portion 12 is used. At the lower surface position of the table plate 1 corresponding to the insertion hole 8 of the frame 7, a guide hole 9 smaller in diameter and shallower than the screw portion 12 is drilled in advance by a drill.
When the screw portion 12 is inserted into the guide hole 9 through the insertion hole 8 and screwed vertically into the table plate 1, the screw portion 12
It is bitten into the F board 3 and the foamed resin board 2 and is held so as not to easily come off the table board 1. Thus, the table 1 is firmly fixed on the frame 7.

According to the table plate 1 of the present embodiment, since the foamed resin plate 2 is used for the main part of the thickness, the weight can be reduced as compared with the conventional plywood table plate, and thus the manual and electric motor can be used. Regardless, the lifting unit 6 can be moved up and down with small power.

Further, since the foamed resin plate 2 and the MDF plate 3 having no directionality as compared with the plywood are used, there is no fear of warping and the water resistance is good.

Further, since the MDF plate 3 does not easily deform elastically unlike the foamed resin plate, the MDF plate 3 does not come off from the bite of the screw portion 12 and greatly contributes to the improvement of the overall wood screw holding force. Furthermore, the melamine resin decorative plate 4 also contributes to an improvement in wood screw holding power due to its rigidity. For this reason, even if the frame 7 is pulled very strongly outward, there is no fear that the wood screw 10 comes off from the table board 1.

Further, the table board 1 of the present embodiment is particularly improved in vibration absorption by combining the foamed resin board 2, the MDF board 3, and the melamine resin decorative board 4, so that the embroidery sewing machine can be used. Contributes to reduction of vibration and noise. The reason why the vibration absorption is improved is that the foamed resin plate 2
That the natural vibration frequencies of the melamine resin decorative board 4 and the MDF board 3 are different from each other, in particular, that the natural vibration frequencies of the foamed resin board 2 and the MDF board 3 greatly differ from the natural vibration frequencies of the melamine resin decorative board 4 It is considered that this causes the vibration of each layer to be canceled.

The table 15 of the second embodiment shown in FIG.
To increase the overall thickness, the upper and lower MD
It differs from the first embodiment only in that two layers of foamed resin plates 2 are joined and laminated between F plates 3. Therefore, portions common to the first embodiment are denoted by the same reference numerals in FIG. 3 as in the first embodiment, and description thereof is omitted. At present, it is difficult to manufacture the thick foamed resin plate 2, and thus such means is effective. The same effect as in the first embodiment can be obtained by the table plate 15 of the present embodiment.

The table 16 of the third embodiment shown in FIG.
Uses the 9 mm thick MDF plate 3 at the center in the thickness direction by replacing the arrangement and the number of layers of the foamed resin plate 2 and the MDF plate 3,
The point where the upper and lower foam resin plates 2 are joined and laminated on the upper and lower surfaces of the MDF plate 3, respectively, and the screw portion 1 of the wood screw 10
The second embodiment differs from the first embodiment only in that it is long enough to reach the MDF plate 3. Therefore, portions common to the first embodiment are denoted by the same reference numerals in FIG. 4 as those in the first embodiment, and description thereof is omitted. The same effect as in the first embodiment can be obtained by the table plate 16 of the present embodiment.

The table 17 of the fourth embodiment shown in FIG.
Is different from the second embodiment only in that the thickness of the MDF plate 3 is 5.5 mm and the decorative melamine resin plate on the lower surface side is omitted. Therefore, portions common to the second embodiment are denoted by the same reference numerals in FIG. 5 as in the second embodiment, and description thereof is omitted. The same effect as in the first embodiment can be obtained by the table plate 17 of this embodiment.

The table board 18 of the fifth embodiment shown in FIG.
The first embodiment differs from the first embodiment only in that the three layers of the MDF board 3 and the two layers of the foamed resin board 2 are alternately stacked and joined and laminated in five layers, and that the melamine resin decorative board on the lower surface is omitted. Different. Therefore, for the common parts with the first embodiment,
The same reference numerals as in the first embodiment denote the same components in FIG. 6, and a description thereof will be omitted. The same effect as in the first embodiment can be obtained by the table plate 18 of the present embodiment.

In order to confirm the effects of the present invention, the table board 1 of the first embodiment and the table boards of Comparative Examples 1 to 4 were measured for weight, and tested for wood screw holding power and vibration absorption. . The comparative example, the test method, and the test result (Table 1) will be described in this order.

[Comparative Example 1] This is a table board in which a melamine resin decorative board having a thickness of 1 mm is joined and laminated on an upper surface and a lower surface of a plywood having a thickness of 24 mm. This corresponds to the conventional plywood table board 50 shown in FIG. [Comparative Example 2] This is a table plate in which a 1 mm-thick melamine resin decorative plate is joined and laminated on the upper and lower surfaces of a foamed resin plate having a thickness of 20 mm (two pieces of the above-mentioned "Palonia").

Comparative Example 3 This is a table board in which a 1-mm-thick melamine resin decorative board is joined and laminated on the upper and lower surfaces of a 20-mm-thick MDF board. [Comparative Example 4] A table plate in which a 4 mm-thick MDF plate is joined to the upper and lower surfaces of a 10 mm-thick foamed resin plate (the above-mentioned "Palonia"). Table board 1 of the present invention
From which the melamine resin decorative plate 4 on the upper surface side and the lower surface side is removed.

[Weight] Each table board is 3 × 6 (9
(10 mm x 1820 mm), and the weight was measured. Lighter weight is better.

[Wood screw holding power] JIS A5905
It was measured by the "wood screw holding force test method" specified in ^-1994 . In this test, a wood screw (nominal diameter: 2.7 mm, length: 16 mm, specified in JIS B1112) was used (the screw portion was about 11 mm). First, set the table board to 5
A test piece of 0 mm × 100 mm was cut, and a guide hole having a depth of about 3 mm was provided at two places 25 mm away from both long and short sides of the upper surface with a drill having a diameter of 2 mm. Next, the tips of the two wood screws were inserted into the two guide holes, and screwed vertically into the test piece. Then, after fixing the test piece, the wood screw cut into the test piece was pulled out vertically using a precision universal testing machine. The maximum load required for this pulling out was measured at each position, and the average value of the two positions was taken as the wood screw holding force. In case of table board for embroidery sewing machine, wood screw holding power is
Generally, 40 kg or more is required.

[Vibration Absorption] Vibration transmission in the thickness direction was measured using an electrokinetic tester. For the measurement, 15 tables
A test piece obtained by cutting to 0 mm × 150 mm was used.
First, a test piece was fixed on a vertical vibration generating plate with an instant adhesive, a 3 kg weight was fixed thereon, and a sensor was further fixed thereon. Then, a constant acceleration of 2 G was applied in the sine wave frequency sweep test, and a frequency response function (= vibration acceleration / excitation force) dB in a range of 300 to 700 Hz was measured. The smaller the frequency response function, the better the vibration absorption.

[0044]

[Table 1]

In Table 1, ◎ indicates very good, は indicates good, △ indicates normal, and × indicates bad. As can be seen from Table 1, Comparative Examples 1 and 3, which do not use a foamed resin plate, are not preferable because of their large weight. Comparative Example 2 is lightweight because it does not use a wood board, but is inferior in wood screw holding power. Comparative Example 4, which does not use a melamine resin decorative board, is inferior to Comparative Example 1 and the present invention in vibration absorption.

The present invention is not limited to the above embodiment, but may be embodied with appropriate modifications without departing from the spirit of the invention, for example, as follows. (1) The arrangement and the number of layers of the foamed resin plate 2 and the MDF plate 3 are further changed. (2) Instead of the melamine resin decorative board 4, another thermosetting resin decorative board is used.

(3) Other than table boards for embroidery sewing machines, for example, for knitting, scooping, face-down sewing, with buttons, drilling, basting sewing, gloves, athletic shoes, leather, and fur To be embodied as a table plate for various sewing machines, such as for hat making, bag making, bookbinding, etc. (4) The present invention is embodied as a table plate other than a table plate for a sewing machine, for example, a table for a vehicle seat, a table for a wheelchair, a table for a nursing bed, a table for an infant chair, and the like.

[0048]

Since the table board of the present invention is constructed as described above, it is possible to not only reduce the weight, improve the water resistance and prevent the warpage without using plywood, but also to retain the wood screws. And the vibration and noise can be improved to reduce vibration and noise.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a table plate according to a first embodiment.

FIG. 2 is a perspective view showing an embroidery sewing machine using the table board.

FIG. 3 is a cross-sectional view illustrating a table plate according to a second embodiment.

FIG. 4 is a cross-sectional view illustrating a table plate according to a third embodiment.

FIG. 5 is a sectional view showing a table plate according to a fourth embodiment.

FIG. 6 is a cross-sectional view illustrating a table plate according to a fifth embodiment.

FIG. 7 is a sectional view showing a conventional plywood table board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Table board 2 Foam resin board 3 MDF board 4 Melamine resin decorative board 15 Table board 16 Table board 17 Table board 18 Table board

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Rintaro Tsuruta 50, Hongo, Akamatsucho, Anjo-shi, Aichi Prefecture (72) Inventor Hiroshi Iguchi 252-20 Izumicho, Toki-shi, Gifu Prefecture

Claims (5)

[Claims] 1. A table plate comprising at least one layer of a foamed resin plate, at least one layer of an MDF plate, and at least one layer of a thermosetting resin plate. 2. An at least one foamed resin plate at the center in the thickness direction, at least one upper MDF plate and at least one lower MDF plate superposed on the upper and lower surfaces of the foamed resin plate, and the upper MDF plate A table plate comprising: a thermosetting resin plate laminated on at least one of an upper surface of the plate or a lower surface of the lower MDF plate. 3. The MDF of at least one layer at the center in the thickness direction
Plate, at least one upper layer foam resin plate and at least one lower layer foam resin plate superimposed on the upper surface and lower surface of the MDF plate, and the upper surface of the upper layer foam resin plate or the lower surface of the lower layer foam resin plate. A table plate in which a thermosetting resin plate laminated on at least one is laminated. 4. A table in which a foamed resin plate and an MDF plate alternately stacked so as to have five or more layers and a thermosetting resin plate stacked on at least one of the upper surface or the lower surface of the stacked ones are stacked. Board. 5. The table plate according to claim 1, wherein the table plate is a table plate for a sewing machine.