JP2002370191A - Low dusting bellow-like cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low dusting bellow-s-like cover capable of improving durability while preventing sticking of dust by static electricity. SOLUTION: After adhering the mutual adjacent inner-outer peripheral edges of a plurality of static electricity removing metallic foil 2 by an adhesive layer 3, the mutual inner-outer peripheral edges adhered with the static electricity removing metallic foil 2 are molded in a bellows shape by welding to constitute this low dusting bellows-like cover 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows-like cover with low dust generation for covering a sliding portion of a device used in a clean environment.

[0002]

2. Description of the Related Art In a robot or the like used in a clean environment, dust is unavoidably generated from a sliding portion, so that the sliding portion is covered with an elastic bellows-like cover.

However, there has been a problem that static electricity is generated on the surface of the bellows-like cover due to expansion and contraction of the bellows-like cover, and dust is attached to the surface of the bellows-like cover by the static electricity.

[0004] Therefore, there has been proposed a method in which the bellows-like cover is formed of an antistatic film to suppress the generation of static electricity and to prevent dust and the like from adhering to the bellows-like cover (see, for example, Japanese Patent Application Laid-Open No. Hei 1 (1994)).
1-1138488).

[0005]

However, when the bellows-like cover is made of an antistatic film, the antistatic film (static electricity removing process) reduces the flexibility of the antistatic film by performing the antistatic treatment (static elimination treatment). Due to the expansion and contraction of the antistatic film, there is a problem that the welded portion of the antistatic film is cut or peeled off and the durability of the bellows-like cover is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a bellows-like cover having a low dusting property which can improve durability while preventing adhesion of dust and the like due to static electricity. Is to do.

[0007]

In order to achieve the above object, according to the present invention, a plurality of static electricity removing metal foils are adhered to each other by using an adhesive layer, and then a plurality of static electricity removing metal foils are bonded together. The inner and outer peripheral edges to which the foil is adhered are formed into a bellows shape by welding, thereby forming a bellows-like cover with low dust generation.

According to a second aspect of the present invention, in the first aspect, the metal foil for removing static electricity has a thickness of 20 to 150 mm.
It is characterized by being made of aluminum, copper, stainless steel, iron or brass of μm.

According to a third aspect of the present invention, in the first aspect, the adhesive layer has a thickness of 0.2 to 2.0 mm.
It is characterized by being composed of a simple substance or a composite of acrylic, urethane, NBR, butadiene or natural rubber having a tensile strength of 60 N or more and a tensile strength of 25 MPa or more.

According to a fourth aspect of the present invention, adjacent inner and outer peripheral edges of a plurality of composite films having a two-layer structure of an antistatic film layer and a protective cover film layer are welded to form a bellows shape. A low dust-generating bellows-like cover is configured.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a protective cover film is applied to a welded portion of the composite film.

According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the antistatic film layer is formed of a film having a thickness of 10 to 35 μm containing an antistatic agent.

According to a seventh aspect of the present invention, in the fourth or fifth aspect, the protective cover film layer and the protective cover film are formed of a film having a thickness of 25 to 50 μm, a tensile strength of 25 MPa, and an elongation of 300% or more. It is characterized by having done.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1> FIG. 1 is a side view of a scalar type robot provided with a low dust generating bellows-like cover according to the present invention, and FIG. 2 is a partial cross section of the low dust generating bellows type cover according to the present invention. FIG. 3 is an enlarged detailed view of a portion A of FIG. 2, and FIG. 4 is an enlarged detailed view of a portion B of FIG.

A scalar robot 50 shown in FIG. 1 is used in a clean environment. A first arm 52 is supported on a main arm 51 so as to be able to turn horizontally. A second arm 53 is also supported at the distal end so as to be horizontally pivotable.

At the end of the second arm 53, a tool mounting shaft 54 that slides up and down by a ball screw mechanism (not shown) is provided.
Is covered with a low dust-producing bellows-like cover 1 according to the present invention. The second arm 53 supporting the tool mounting shaft 54 supports a ball screw mechanism and a motor (not shown) that is a driving source for the ball screw mechanism.
5 is covered. The main arm 51 and the second arm 53 are connected by a flexible hose 56, and a power cable, a signal cable, an air pipe, and the like (not shown) pass through the inside of the flexible hose 56. .

Next, details of the low dust-generating bellows-like cover 1 according to the present invention will be described with reference to FIGS.

The bellows-like cover 1 having low dusting properties according to the present embodiment is obtained by stacking a plurality of ring-shaped static electricity removing metal foils 2 which are bent into a dish shape by press molding or the like, with the top and bottom inverted. Adjacent inner and outer peripheral edges are adhered to each other by an adhesive layer 3 and then the inner and outer peripheral edges to which the static electricity removing metal foil 2 is adhered are welded together to form a bellows shape.

The low dust-generating bellows-like cover 1 constructed as described above expands and contracts with the vertical movement of the tool mounting shaft 54 shown in FIG. It functions to effectively prevent dust from being generated from the shaft 54.

Here, the static electricity removing metal foil 2 is made of aluminum, copper, stainless steel, iron or brass having a thickness of 20 to 150 μm.

The thickness of the metal foil 2 for removing static electricity is 20 μm.
If it is less than 150 m, the metal foil 2 may be broken. If it exceeds 150 μm, the rigidity of the metal foil 2 becomes too high and the sliding resistance of the tool mounting shaft 54 becomes large. I will. For this reason, the thickness of the metal foil 2 is 20
It should be set to １５０150 μm, more preferably 30 to 80 μm.

The adhesive layer 3 has a thickness of 0.2 to 2.
Acrylic, urethane, N with 0 mm, tensile strength 60 N or more, tensile strength 25 MPa (tensile speed 50 mm / min) or more
It is composed of a simple substance or a composite of BR, butadiene or natural rubber.

If the thickness of the adhesive layer 3 exceeds 2.0 mm, it is difficult to make the metal foils 2 conductive, and if the tensile strength is less than 60 N, the metal foils 2 may break during use. If the pressure is less than 25 MPa, the metal foil 2 may peel off from the adhesive layer 3.

As described above, in the present embodiment, the thickness 2
A plurality of static electricity removing metal foils 2 made of aluminum, copper, stainless steel, iron or brass having a thickness of 0.2 to 2.0 mm and a tensile strength of 0 to 150 μm each having a thickness of 0.2 to 2.0 mm.
N or higher, acrylic or urethane with a tensile strength of 25 MPa or higher,
After bonding with an adhesive layer 3 composed of a simple substance or a composite of NBR, butadiene, or natural rubber, the inner and outer peripheral edges of the metal foil 2 to which static electricity has been removed are welded to each other to form a bellows-like cover with low dust generation. Since the cover 1 is constructed, the durability of the low dust-generating bellows-like cover 1 is enhanced, and the bellows-like cover 1 can be used stably for a long period of time.

Also, since the static electricity removing metal foil 2 is subjected to an antistatic treatment (static electricity removing treatment), even if the low dust-producing bellows-like cover 1 repeatedly expands and contracts, static electricity is generated on its surface. As a result, adhesion of dust and the like to the low dust-producing bellows-like cover 1 due to static electricity is effectively prevented.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a partial cross-sectional view of the low dust-generating bellows-like cover according to the present embodiment.

In the bellows-like cover 11 having low dusting properties according to the present embodiment, a plurality of ring-shaped composite films 12 bent and formed into a dish shape by press molding or the like are placed upside down on each other, and are adjacent to each other. The inner and outer peripheral edges are welded to each other, and the welded portion is covered with a protective cover film 13 to form a bellows shape.

The low dust-generating bellows-like cover 11 constructed in this way also moves up and down the tool mounting shaft 54 shown in FIG. 1 similarly to the low dust-generating bellows-like cover 1 according to the first embodiment. With the expansion and contraction, it always covers the exposed part of the tool mounting shaft 54,
The function of effectively preventing dust from being generated from the tool mounting shaft 54 is achieved.

Here, each composite film 12 is composed of an antistatic film layer 12A and a protective cover film layer 12B.
The antistatic film layer 12A has a layer structure,
It is composed of a film having a thickness of 10 to 35 μm containing an antistatic agent. In addition, as the antistatic agent, a cationic activator, an anionic activator, an amphoteric activator, an amine compound, an alkyl phosphate ester, Na-alkyl-diphenyl ether disulfide, polyoxyethylene alkylamine, or the like is used.

The protective cover film layer 12B and the protective cover film 13 are formed of a film having a thickness of 25 to 50 μm, a tensile strength of 25 MPa, and an elongation of 300% or more. If the thickness of the protective cover film layer 12B and the protective cover film 13 is less than 25 μm,
Alternatively, when the elongation is less than 300%, these films 12B and 13 may be broken, and the thickness is 50%.
When the thickness exceeds μm, these films 12B and 13
Becomes too high, and the resistance increases.

The composite film 12 having a two-layer structure is
Antistatic film layer 12A and protective cover film layer 12
B may be bonded, or one may be formed as a carrier film by applying the remaining film components thereon.

As described above, in the present embodiment, the inner and outer peripheral edges of a plurality of composite films 12 forming a two-layer structure by the antistatic film layer 12A and the protective cover film layer 12B are welded to each other. Since the protective cover film 13 is applied to the welded portion to form the low dust-generating bellows-like cover 11, the durability of the low dust-generating bellows-like cover 11 is enhanced,
This can be used stably for a long time.

In addition, the low dust-generating bellows-like cover 11 is provided with an antistatic film layer 12A in which an antistatic agent is blended on the front side, so that the low dust-generating bellows-like cover 11 repeats expansion and contraction. However, no static electricity is generated on the surface, and the adhesion of dust and the like to the low dust-producing bellows-like cover 11 due to the static electricity is effectively prevented.

[0035]

As is apparent from the above description, according to the present invention, the inner and outer peripheral edges of a plurality of static electricity removing metal foils are adhered to each other by an adhesive layer, and then the static electricity removing metal foils are adhered. The inner and outer peripheral edges are welded together or formed into a bellows shape by welding adjacent inner and outer peripheral edges of a plurality of composite films forming a two-layer structure with an antistatic film layer and a protective cover film layer. Since the low dust-generating bellows-like cover is configured, it is possible to improve the durability of the low dust-generating bellows-like cover while preventing adhesion of dust or the like to the low dust-generating bellows-like cover due to static electricity. can get.

[Brief description of the drawings]

FIG. 1 is a side view of a scalar type robot provided with a low dust-generating bellows-like cover according to the present invention.

FIG. 2 is a partial cross-sectional view of a low dust-generating bellows-like cover according to Embodiment 1 of the present invention.

FIG. 3 is an enlarged detail view of a portion A in FIG. 2;

FIG. 4 is an enlarged detail view of a portion B in FIG. 2;

FIG. 5 is a partial cross-sectional view of a low dust-generating bellows-like cover according to Embodiment 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Low dust-producing bellows-like cover 2 Static electricity removal metal foil 3 Adhesive layer 12 Composite film 12A Antistatic film layer 12B Protective cover film layer 13 Protective cover film

Claims (7)

[Claims] An inner and outer peripheral edge of a plurality of static electricity removing metal foils is bonded to each other with an adhesive layer, and then the inner and outer peripheral edges of the static electricity removing metal foil are welded together to form a bellows shape. A bellows-like cover with low dusting characteristics. 2. The method according to claim 1, wherein the metal foil for removing static electricity has a thickness of 20 to 15 mm.
The bellows-like cover of claim 1, wherein the cover is made of 0 μm aluminum, copper, stainless steel, iron or brass. 3. The adhesive layer has a thickness of 0.2 to 2.0 m.
2. The bellows-like cover according to claim 1, wherein the cover is made of a single or composite of acrylic, urethane, NBR, butadiene or natural rubber having a tensile strength of 60 N or more and a tensile strength of 25 MPa or more. 4. A low-profile structure characterized by being formed in a bellows shape by welding adjacent inner and outer peripheral edges of a plurality of composite films having a two-layer structure of an antistatic film layer and a protective cover film layer. Dust-producing bellows-like cover. 5. The bellows-like cover with low dust generation according to claim 4, wherein a protective cover film is applied to a welded portion of the composite film. 6. The bellows-like cover according to claim 4, wherein said antistatic film layer is composed of a film having a thickness of 10 to 35 μm containing an antistatic agent. 7. The protective cover film layer and the protective cover film have a thickness of 25 to 50 μm and a tensile strength of 25 MP.
The low dust-generating bellows-like cover according to claim 4 or 5, wherein the cover is made of a film having an elongation of 300% or more.