JP2003011078A - Holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder using a tube having a large expansion and suppressing occurrence of puncture, and preventing abrasion powders from being stuck to an object in use. SOLUTION: This holder comprises a base substance divided into a large-diameter portion and a small-diameter portion in its midway, a cylindrical movable member having one end where the end of the small-diameter portion of the base substance is drawably inserted and the closed other end, an elastic body disposed in a clearance between the large-diameter potion end face in the small-diameter portion side of the base substance and the movable member opposed thereto, and a tube having one opening part externally inserted around the large diameter portion end part in the base substrate small-diameter portion side and the other opening part externally inserted around the movable member end part in a hermetically sealed state. A fluid storage chamber is formed of the movable member, the base substrate and the tube, and the base substance is provided with feed/discharge channels capable of feeding and discharging the fluid to/from the fluid storage chamber. This holder is characterized in that the feed of the fluid through the feed/discharge channel enlarges the diameter of the tube circumferential surface while the discharge of the fluid afterwards reduces the diameter of the tube circumferential surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping device for inflating a tube and bringing the tube into close contact with an inner wall of a tubular body to grip the tube.

[0002]

2. Description of the Related Art One of the methods for applying a coating liquid to the surface of a cylindrical body such as a drum to form a coating film or the like is a method of suspending and immersing the cylindrical body in the coating liquid. In this method, since the upper portion of the tubular body needs to be suspended while being held by the holding device during the immersion, the coating film is not formed on the contact portion between the tubular body and the holding device. Therefore, the place where the tubular body is gripped must be other than the place where the coating film is formed, and it is difficult to form the coating film on the entire surface of the tubular body by the method.

In order to solve the above problems, a device as shown in FIG. 7 is used. In the apparatus, the both ends of a tube 102 are crimped to the outer peripheral surfaces of both ends of a hard substrate 101 in which a fluid supply / discharge channel 100 is formed.
It is configured to be attached in 4.

In the case of the apparatus shown in FIG. 7, a large amount of fluid may be supplied in order to greatly expand the tubular tube 102 having openings at both ends, but there is a risk that the tube may be punctured due to excessive supply. Further, when a reinforcing cord, a shape stabilizing cord, or the like is embedded in the tube 102, the expansion amount of the tube 102 is significantly limited. Furthermore, in order to improve the gripping force, the tube 102
However, in the device in which both ends of the tube 102 are fixedly attached at immovable positions, the expansion of the tube 102 was insufficient.

Therefore, the inventors of the present invention first disclosed in Japanese Patent Laid-Open No. 6-8.
Japanese Patent No. 179 discloses a gripping device for a component or the like that has a large expansion amount and does not cause puncture. But,
The apparatus is provided with a seal member for maintaining hermeticity around the movable member, and when the movable member moves in the base body, the seal member slides on the inner wall of the base body. Abrasion powder may adhere to and contaminate target parts (cylindrical bodies, etc.).

[0006]

From the above, the present invention is
An object of the present invention is to provide a gripping device that uses a tube that has a large expansion amount and that suppresses the occurrence of puncture, and that does not cause abrasion powder to adhere to target parts during use.

[0007]

The above objects can be solved by the present invention described below. That is, the present invention, a base body divided into a large-diameter portion and a small-diameter portion in the middle, a tubular movable member in which the small-diameter portion end portion of the base body is insertably inserted into one end, and the other end is closed, An elastic body disposed in the small-diameter side end surface of the base body and the gap between the movable members facing the small-diameter side end surface, and one opening is externally sealed to the large-diameter part end portion of the base body small-diameter section side. And a tube in which the other opening is inserted into the end of the movable member in a sealed state, and a fluid storage chamber is formed by the movable member, the base, and the tube, and the fluid is added to the base. A supply / exhaust flow path capable of supplying / exhausting fluid to / from the storage chamber is provided, and the tube peripheral surface is expanded in diameter by supplying fluid through the supply / exhaust flow path, and then the tube is discharged by discharging fluid. The gripping device is characterized in that the peripheral surface is reduced in diameter.

When the tube peripheral surface is reduced in diameter and inserted into the middle of the tubular body and a fluid such as air is supplied to the fluid storage chamber from the supply / discharge channel, the tube peripheral surface externally sealed is sealed. Large diameter expansion (expansion). Since the diameter of the tube peripheral surface is greatly expanded (expanded), pressure is generated toward the inner wall of the tubular body, so that the tubular body can be gripped. Further, since the tube peripheral surface is reduced in diameter by discharging the fluid, it can be easily removed. In particular, the elastic body disposed in the large diameter end surface of the base on the small diameter side and the gap between the movable members facing it Since the diameter of the tube peripheral surface is reduced more smoothly, a highly responsive gripping device can be obtained. Furthermore, since one end of the movable member has a closed cylindrical shape, the abrasion powder does not remain in the closed low portion and does not adhere to the target parts such as the cylindrical body.

In the present invention, the elastic body is preferably a spring. In the present invention, the material of the tube is at least Viton (fluorine-based), E
It is preferably made of one or more materials selected from the group consisting of PDM and silicon. Furthermore, the gripping device of the present invention is preferably used for gripping the photosensitive drum.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on the embodiments. FIG. 1 is a schematic sectional view of a gripping device according to an embodiment of the present invention. Grasping device 1 of the present embodiment
Is a base 2 divided into a large diameter portion A and a small diameter portion B in the middle,
The end of the small-diameter portion B of the base 2 is inserted into one end so that it can be inserted and removed,
A tubular movable member 6 having the other end closed, an elastic body 5 arranged in the gap between the movable member 6 facing the end surface of the large diameter portion A on the small diameter portion B side of the base body 2 and one opening portion. Is hermetically inserted into the end of the large diameter portion A on the small diameter portion B side of the base 2 by the caulking ring 8 and the other opening is hermetically inserted into the end of the movable member 6 by the caulking ring 9. It is composed of a tube 4 and a tube. The caulking ring 8
Instead of 9 and 9, the elastic body 5 may be fixed by other means such as a screw or an adhesive.

A fluid storage chamber 7 is formed by the movable member 6, the base body 2 and the tube 4, and the base body 2 is provided with a supply / discharge channel 3 for supplying / discharging a fluid to / from the fluid storage chamber 7. . Then, by supplying fluid through the supply / discharge channel 3, the peripheral surface of the tube 4 is expanded, and by discharging the fluid thereafter, the peripheral surface of the tube 4 is contracted (FIG. 2). .

In order to operate the gripping device constructed as described above, first, from the state shown in FIG. 1, at least the large diameter portion A of the gripping device 1 is placed so that the movable member 6 is located at the tip of the tubular body. Insert to the end of. A fluid such as air is supplied into the fluid storage chamber 7 through the supply / discharge channel 3. The tube 4 expands when the fluid is supplied, and the caulking ring 9 causes the tube 4 to expand.
The movable member 6 fixed to one end of is contracted to the large diameter portion A side while contracting the elastic body 5. When the fluid is further supplied into the tube 4, the movable member 6 moves and stops until the elastic body 5 is completely contracted, or as shown in FIG. 2, up to the closed portion of the movable member 6. The tubular body is stably gripped by the expansion of the tube 4. By providing the elastic body 5,
Even when the supplied fluid is exhausted, the tube 4 and the movable member 6 can be smoothly and quickly returned. In the present specification, “grasping” means holding a component such as a tubular body by a pressure such as expansion.

The cylindrical body which can be grasped by the grasping apparatus 1 of the present invention can be used without limitation in size, material and the like. Specifically, it can be used for dip coating of a photosensitive drum. As the fluid to be supplied and discharged, a liquid such as water or a gas such as air can be used. A spring is preferably used as the elastic body 5.

The material of the tube 4 is at least one selected from the group consisting of Viton (fluorine-based), EPDM and silicon in consideration of durability, stretchability, environment resistance (solvent resistance) and the like. It is preferable to use the above material.

FIG. 3 shows a partially developed view of the tube 4 and shows an example in which various cords 11 are embedded. Also, FIG.
In the example shown in, the cord 11 is embedded in a bias shape. The crossing angle θ in the bias state is preferably 20 ° or less. FIG. 4 shows a cross section of the tube 4 shown in FIG. Further, as shown in FIG. 5, the buried state of the cord 11 may have a radial structure. FIG. 6 shows a cross section of the tube 4 shown in FIG. The cord 11 may have one layer or two or more layers. In the case where the cord 11 is embedded, the dimensional stability of the tube 4 is improved, and there is no risk of puncture even if the fillable internal pressure is high. With such a configuration, the amount of expansion of the tube 4 may be limited, but in the embodiment shown in FIG. 1, the movable member 6 is movable, so that the movable member 6 moves. Since the distance between both ends of the tube 4 is shortened, the tube 4 can be expanded sufficiently.

The material of the substrate 2 can be variously changed according to the use and is not particularly limited, but iron,
Aluminum, alloys containing these, stainless steel, and the like can be used.

As the material of the movable member 6, the same material as that of the base 2 can be used, and further, the sliding portion with the base may be subjected to a surface treatment for reducing friction. Although the shape of the movable member is a structure in which the edge is overhanging in the drawing, the shape is not limited to such a structure, and various shapes such as a cup shape can be used depending on the application.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above-mentioned embodiments, and various sizes and the like can be obtained based on known knowledge. You can make changes. For example, the fluid storage chamber 7
If the supply / discharge channel 3 capable of supplying / discharging the fluid is provided in the flow path, as shown in FIG. 1, the supply / discharge channel 3 does not need to have a configuration extending in parallel to the axial direction, It may have a separate structure or a structure in which the flow path extends in an oblique direction.
Alternatively, the tube 4 may be lengthened, a plurality of cylindrical movable members may be provided on the way, and the movable member 6 having one end closed may be provided at the end of the base body.

[0019]

As described above, in the gripping device of the present invention, the amount of expansion of the tube is large, the occurrence of puncture is suppressed, and abrasion powder does not adhere to the target component during use.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a gripping device of the present invention.

2 is a cross-sectional view of the gripping device shown in FIG. 1, showing a state in which a fluid is supplied to a fluid storage chamber of the gripping device.

FIG. 3 is a development view showing an example of a tube when a cord is embedded.

FIG. 4 is a view showing a cross section of the tube shown in FIG.

FIG. 5 is a development view showing another example of the tube when the cord is embedded.

6 is a view showing a cross section of the tube shown in FIG.

FIG. 7 is a cross-sectional view showing a part of a conventional gripping device.

[Explanation of symbols]

1 ... Grip device 2 ... Base 3 ... Supply and discharge flow path 4 ... tube 5 ... Elastic body 6 ... Movable member 7 ... Fluid storage chamber 8, 9 ... Caulking ring A: Large diameter part B: Small diameter part

Claims (4)

[Claims] 1. A base body divided into a large-diameter portion and a small-diameter portion midway, a tubular movable member in which an end portion of the small-diameter portion of the base body is insertably inserted into one end and the other end is closed, An elastic body disposed in the large diameter portion end surface of the small diameter portion side of the base body and the gap between the movable members facing the large diameter portion end surface, and one opening of the elastic body are externally sealedly inserted into the large diameter portion end portion of the small diameter portion side of the base material And a tube in which the other opening is externally inserted into the end of the movable member in a sealed state, and a fluid storage chamber is formed by the movable member, the base body, and the tube, and the fluid storage chamber is formed in the base body. A chamber is provided with a supply / discharge channel capable of supplying / discharging a fluid, and by supplying the fluid through the supply / discharge channel, the tube peripheral surface is expanded in diameter, and then the fluid is discharged to cause the tube peripheral surface to expand. A gripping device whose surface is reduced in diameter. 2. The gripping device according to claim 1, wherein the elastic body is a spring. 3. The grip according to claim 1, wherein the material of the tube is at least one material selected from the group consisting of Viton (fluorine-based), EPDM, and silicon. apparatus. 4. The gripping device according to claim 1, which grips the photosensitive drum.