JPS6320068A - Device for holding barrel for dip coating - Google Patents

Abstract

PURPOSE:To easily coat only the outer surface of a barrel by providing a lifting member to the seal plate at the upper part of the barrel to be coated, and furnishing a holding member to be pressed on the inner surface of the barrel in association with the lifting movement. CONSTITUTION:The seal plate 21 having a slightly larger diameter than the barrel 1 and covering the upper end of the barrel 1 is provided, and the seal plate 21 is closely attached to the barrel 1 through a sealant 23, a small-bore part 22, a flexible member 24, etc., on the lower surface of the plate 21. A lifting rod 25a piercing through the seal plate 21, the small-bore part 22, and the flexible member 24 is further provided, a holding member such as plural movable claws 26 is pivoted on the tip of the lifting rod 25a, and the claws 26 are energized so that the claws are contracted toward the lifting rod 25a, namely the flexible member 24 side. Consequently, when the lifting member is pulled up, the holding member is pressed on the inner surface surface of the barrel. Accordingly, only the outer surface of the barrel is easily coated, and the productivity of the work is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dip coating device for coating only the outer surface of a cylinder, and more particularly to a device for holding a cylinder to be coated.

[Conventional technology and its problems]

Various methods have been known for applying paints and the like to the surface of the cylinder, but especially when the smoothness of the paint film is important, it is desirable to apply by dip coating.

In a typical dip coating method, the cylinder is immersed in a diluted liquid and then pulled out at a moderate speed for coating. However, in this case, since the paint enters the inside of the cylindrical body that is open both upward and downward, the inner surface is also coated. When paint is applied to the inner surface of the cylinder, not only is the paint wasted, but there are also disadvantages such as the inner surface becoming difficult to dry or the problem of contamination occurring.

To solve this problem, there is a method of attaching a lid to the bottom of the cylinder to prevent paint from adhering to the inner surface of the cylinder. However, this method has poor workability because it takes time and effort to attach the lid. Furthermore, during immersion, paint adheres to the surface of the lid, so the lid must be cleaned, making maintenance work troublesome.

Conversely, by closing the top of the cylinder, air is trapped inside the cylinder when it is immersed in paint.
Another method is to use air pressure inside the cylinder to prevent paint from entering. In this way, as a device for sealing the upper part of the cylinder and holding the cylinder, as described in Japanese Patent Application Laid-Open No. 59-4466, a device that uses a fluid-tight bag part that can be expanded and contracted is used. Mechanisms for preventing gas flow inside a cylinder are known.

However, the device disclosed in the above publication requires pressurized air to operate the bag portion, which not only increases the number of attached mechanisms but also requires a pressurized air control device, making the device complex. There were drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cylindrical body holding device that can hold a cylindrical body while sealing the upper part of the cylindrical body using a simple mechanism.

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a lifting member on the sealing plate that seals the upper part of the cylinder to be coated, and also provides a lifting member that is linked to the lifting of the lifting member. The present invention is characterized in that a holding member is provided which presses against the inner surface of the tube and thereby holds the cough tube.

With this configuration, when the pulling member is pulled up, the holding member comes into pressure contact with the inner surface of the cylindrical body, and the cylindrical body is held against the pulling member. Furthermore, by pulling up the pulling member,
The cylinder is pulled upward with the upper end portion of the cylinder sealed by the sealing plate.

〔Example〕

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, features of the present invention will be specifically described based on examples with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing a state in which the cylinder body is held by the cylinder body holding device, and FIG. 2 is a schematic cross-sectional view showing a state in which the cylinder body holding device and the cylinder body are separated.

Reference numeral 1 indicates a cylinder to which paint is to be applied, and reference numeral 2 indicates a cylinder holding device that holds the cylinder 1 as a whole. The cylinder holding device 2 is
A sealing plate 21 that has a slightly larger diameter than the cylinder 1 and covers the upper end of the cylinder 1.
A small diameter portion 22° that can fit inside the upper end of the cylinder 1 attached to the lower surface Q of the sealing plate 21 is provided on the lower outer circumferential surface of the sealing plate 21 and is in close contact with the upper end of the cylinder 1 over the entire circumference. It includes a sealing material 23, a flexible member 24 attached to the lower surface of the small diameter portion 22, and the like. Furthermore, the cylinder holding device 2 is provided with a movable lifting rod 25a that penetrates the sealing plate 21□ small diameter portion 22 and the flexible member 24, and the lifting rod 25a is movably provided.
5a is a lifting cylinder 25b attached to the sealing plate 21
Guided by. The pulling rod 25a and the lifting cylinder 25b are collectively referred to as a pulling member 25. Pulling rod 25
A plurality of movable claws 26 are pivotally supported at the tip of a. Note that the movable claw 26 is connected to the lifting rod 25a by means not shown.
In other words, it is assumed that the flexible member 24 is biased so as to narrow toward the flexible member 24 side. Further, an elastic body may be provided at the tip of the movable claw 26.

Next, the operation will be explained.

FIG. 2 shows the state before the cylinder 1 is held by the cylinder holding device 2, in which the lifting rod 25a is held against the lifting cylinder 25b.
By being pulled down slightly, the movable claw 26 is in a narrowed state.

Here, as shown in FIG. 1, the lower part of the cylinder holding device 2 is inserted into the cylinder 1, and the sole material 23 is brought into close contact with the entire circumference of the upper end of the cylinder 1.

Next, by pulling up the pulling rod 25a, the movable claw 26 comes into contact with the flexible member 24, so the movable claw 26
spreads outward. The tip of the movable claw 26 is connected to the cylindrical body l.
The cylinder body 1 is held by the friction force. After the tip of the movable claw 26 comes into contact with the inner wall of the cylinder 1, the force of pulling up the pulling rod 25a becomes a force that pushes the cylinder 1 upward, so that the upper end of the cylinder 1 touches the sealing material 23.
The sealing is ensured by pressure contact.

In this state, by pulling up the entire cylindrical body holding device 2 with the lifting member 25, the cylindrical body 1 can be lifted with the upper end of the cylindrical body 1 sealed. Incidentally, the flexible member 24 is a bar name.

Any material such as rubber can be used.

FIG. 3 shows how the tube 1 is held by the cough tube holding device 2 and applied by dipping.

Paint 4 is sent out from tank 5 by pump 6,
It is fed into the coating tank 3 via the supply conduit 7. Note that this supply path is provided with a filter 8 to remove floating matter and the like from the paint 4 and supply the cleaned paint 4 to the coating tank 3.

Along with this supply of paint 4, paint 4 is
overflows. This overflowing paint 4
a is collected into the tank 5 via the gutter 9 and the discharge path 10. Note that this gutter 9 is provided with a lid 11 to prevent foreign matter such as dust from getting into the paint 4. In addition, a hood 12 is provided to prevent the flow of outside air from directly touching the application part of the cylinder 1.
is located.

The cylinder 1 is first held by the cylinder holding device 2, dipped in the paint 4 in the coating layer 3 in this state, and then pulled up at a predetermined speed to be coated. After coating, the cylinder 1 is removed from the cylinder holding device 2 and the process proceeds to the next operation.

At this time, in the embodiment of the present invention, the cylinder body holding device 2
The upper end of the cylinder 1 can be sealed and the cylinder 1 can be held by a simple operation of inserting it into the cylinder l and simply pulling up the lifting member 25. becomes extremely simple. In addition, when removing the cylinder 1 from the cylinder holding device 2, the movable claw 26 may be narrowed by pulling down the lifting rod 25a with respect to the lifting cylinder 25b.

Furthermore, holding, sealing, and removing the cylindrical body 1 can be achieved with an extremely simple configuration.

Note that although the lifting and lowering mechanism for the entire cylinder holding device 2 is not shown in the drawings, a commonly used mechanism can be adopted as appropriate.

Regarding the mechanism for lifting the cylinder 1, Figures 1 and 2 show examples; any mechanism that seals the upper part of the cylinder 1 by lifting the cylinder 1 can be It is not limited to the configuration shown in the embodiment.

On the other hand, what about paint 4? If 81JFI is easily evaporated, the pressure of the air inside the cylinder 1 will gradually increase due to the evaporation of the 7 parts of the paint 4 during dip coating as shown in FIG. As the volume of air inside the cylinder 1 increases, bubbles may be generated from the lower end of the cylinder 1. Since these bubbles burst on the paint surface and disturb the paint liquid level, causing serious paint film defects, it is necessary to prevent the generation of these bubbles.

As a method for preventing the generation of bubbles, Japanese Patent Application Laid-Open No. 58186
No. 472 describes that a solenoid valve is operated in accordance with the internal pressure to release the increased air pressure. Also, JP-A-59-4467 and JP-A-60-
Japanese Patent No. 132678 describes that a pressure adjustment mechanism is attached to a closing device that seals the upper part of a cylinder.

However, these methods have a problem in that it is difficult to adjust the amount of air removed and control the amount of pressure adjustment.

Therefore, instead of adjusting the pressure of the air inside the cylinder 1, it is also effective to provide a space that communicates with the inside of the cylinder 1 and add a mechanism that uses the space to alleviate the pressure increase.

The effect of this space will be explained with reference to FIG. 4, which shows another embodiment of the present invention. Note that parts corresponding to FIGS. 1 and 2 are designated by the same reference numerals, and redundant explanation will be omitted.

An airtight casing 13 is provided to cover the upper surface of the sealing plate 21 , and a space 14 is formed between the sealing plate 21 and the airtight casing 13 . The space portion 14 includes a sealing plate 21 and a small diameter portion 2.
The cylinder body 1 is communicated with the inside of the cylinder body 1 through a ventilation hole 15 provided through the cylinder body 2 .

Due to the existence of this space portion 14, even if the pressure inside the cylinder I increases, the pressure increase is alleviated by the increased volume of the space portion 14, making it possible to prevent the generation of bubbles during coating. . Therefore, the unevenness of the coating film caused by the bubbles can be eliminated.

The cylinder holding device according to the present invention can be applied to general immersion coating of cylinders, but is particularly effective when coating electrophotographic photoreceptors, which have strict standards for coating unevenness and defects. It is.

〔Effect of the invention〕

According to the present invention, when coating the surface of the cylinder with the dip coating device, the holding member presses the cylinder from the inner surface in conjunction with the lifting member, so the upper part of the cylinder is It is possible to hold the cylindrical body while sealing the cylindrical body. Further, since the work of holding and removing the cylinder with respect to the cylinder holding device becomes extremely easy, there is an effect that the productivity of the coating work is improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a state in which the cylinder body is held by the cylinder body holding device, and FIG. 2 is a schematic cross-sectional view showing a state in which the cylinder body holding device and the cylinder body are separated. Further, FIG. 3 is a schematic sectional view showing a dip coating device, and FIG. 4 is a schematic sectional view showing another embodiment of the cylinder holding device. 1: Cylindrical body 2: Cylindrical body holding device 3: Coating tank
4: Paint 9: Gutter 10: Discharge channel 13: Airtight housing 14: Space 15: Ventilation hole
21: Sealing plate 22: Small diameter portion 23: Sealing material 24; Flexible member 25: Pulling member 25a: Pulling rod 2
5b: Pulling cylinder 26; Movable claw (holding member) Patent applicant Fuji Xerox Co., Ltd. Agent
Masu Kobori (and 2 others) Figure 1 Figure 3

Claims (1)

[Claims] 1. A lifting member is provided on the sealing plate that seals the upper end of the cylinder to be coated, and in conjunction with the pulling up of the lifting member, the sealing plate is brought into pressure contact with the inner surface of the cylinder to be coated. A cylindrical body holding device for dip coating, characterized in that a holding member for holding the cylindrical body is provided. 2. Claim 1, characterized in that another space communicating with the inside of the cylinder to be coated sealed by the sealing plate is provided outside the cylinder to be coated. Cylindrical body holding device for dip coating.