JPH05257302A - Device for coating drum - Google Patents

Abstract

PURPOSE:To obtain the device which can coat the outer peripheral surfaces of drums with a coating liquid at a uniform thickness and occupies a smaller space by circulating the coating liquid in a coating tank while the coating tank is supported by a lifting machine separated from a housing box so as not to interfere with the housing box and immersing the drums into the coating liquid. CONSTITUTION:The housing box 12 of a pump unit 10 is positioned alongside the body 23 of the lifting machine 20 and tank supporting arms 22 are so lifted that the flange part 41 of the coating tank 40 in the housing box 12 is supported by the supporting arms 22 of the lifting machine 20. The coating liquid 1 is circulated by a circulating pump 13 when the coating tank 40 is so supported by the tank supporting arms 22 as not to interfere with the housing box 12. An arm 21 supporting the respective drums 30 is lowered in this state above the coating tank 40 and the respective drums 30 are immersed into the coating liquid 1 in the coating tank 40. The supporting arm 21 is thereafter so risen that the drums 30 with draws from the coating liquid 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum coating apparatus used for manufacturing a photoconductor drum for an electrophotographic copying machine having a photosensitive layer formed on the outer peripheral surface of a drum such as an aluminum drum, More specifically, the present invention relates to a drum coating device for coating a coating liquid having a photosensitive substance on the outer peripheral surface of an aluminum drum or the like.

[0002]

2. Description of the Related Art A photosensitive drum used in an image forming apparatus such as an electrophotographic copying machine is usually formed by applying a coating liquid containing a photosensitive substance to the outer peripheral surface of an aluminum drum to form a photosensitive layer. It is manufactured by When applying the coating liquid to the outer peripheral surface of the drum, it is necessary to uniformly apply the coating liquid to the outer peripheral surface of the drum so that the manufactured photosensitive layer is uniformly formed.

A drum coating device used for coating a drum with a coating liquid usually has a coating tank 51, a circulation tank 52 and a circulation pump 53 as shown in FIGS. 3 (a) and 3 (b). And the like, and a movable tank unit 50, and an elevator 60 for vertically supporting a plurality of drums 61 on a coating tank 51 of the tank unit 50 in a vertical state. In the coating tank 51 in the tank unit 50,
The coating liquid 1 containing a photosensitive substance is stored, and the coating liquid 1 is constantly circulated through a circulation tank 52 by a circulation pump 53. The coating liquid 1 is circulated by the circulation. The concentration and viscosity are kept constant in the coating tank 51. The elevator 60 has a horizontal arm 62.
Each drum 61 is vertically supported by the arm 62.
When all the drums 61 supported vertically are soaked in the coating liquid 1 in the coating tank 51 and each drum 61 is pulled up from the coating liquid 1, the outer periphery of the drum 61 is lowered. The coating liquid 1 is applied to the surface.

Further, as shown in FIG. 4, the tank unit
The first unit 70 in which the coating tank 51 is housed and the second unit 71 in which the circulation tank 52 and the circulation pump 53 are housed are separately configured as 50, and the first unit 70 and the second unit 50 are provided. 71 and a pair of flexible hoses 72 and
Sometimes connected by 72. In the case of such a configuration, only the first unit 70 is moved so as to be positioned below all the drums 61 of the elevator 60, and the coating tank 51 is moved.
Is located below all the drums 61, each drum 61 is immersed in the coating liquid 1 in the coating tank 51.

[0005]

As shown in FIG. 3, when the coating tank and the circulation tank are housed in one tank unit 50, the vibration of the circulation pump 53 is transmitted to the coating tank 51, The vibration may cause the surface of the coating liquid contained in the coating liquid 1 in the coating tank 51 to wave.
When the coating liquid vibrates, the thickness of the coating liquid 1 applied to the outer peripheral surface of each drum 61 becomes uneven.

On the other hand, as shown in FIG. 4, the tank unit 50 is the first unit in which the coating tank 51 is accommodated.
70 and the second unit 71 in which the circulation pump 53 is housed,
A pair of flexible hoses 72 and 72 in the split state
The vibration of the circulation pump 53 is not transmitted to the coating tank 51 in the first unit 70 by each flexible hose 72, and therefore the coating liquid 1 is applied to each drum 61.
Can be applied in a uniform thickness. However, because the first and second units 70 and 71 are split,
There is a problem that the occupied space of each unit 70 and 71 becomes large. The present invention solves such a problem, and an object thereof is to provide a drum coating apparatus that can coat the outer peripheral surface of a drum with a uniform thickness and occupies a small space. To provide.

[0007]

A drum coating apparatus of the present invention comprises a coating tank containing a coating liquid, a circulation pump for circulating the coating liquid in the coating tank, and a circulation pump. A circulation tank that stores the circulating coating liquid, and a storage box that stores these so that they can be moved integrally,
And a tank unit that has the tank unit and the tank unit that are provided separately, vertically support the drum to which the coating liquid is applied on the outer peripheral surface, and interfere the coating tank of the tank unit with the storage box. In the state where the coating tank and the drum are not moved, the elevator is provided for moving the coating tank and the drum relative to each other, whereby the above object is achieved.

[0008]

In the drum coating apparatus of the present invention, the coating tank is supported by the elevator without interfering with the storage box in the tank unit, and is stored in the coating tank by the circulation pump in the storage box. With the liquid being circulated, the vertically supported drum is immersed in the coating liquid in the coating tank. After that, the drum is pulled up from the coating liquid, so that the coating liquid is applied to the outer peripheral surface of the drum.

[0009]

EXAMPLES Examples of the present invention will be described below. The drum coating apparatus of the present invention is used to coat the coating liquid 1 containing a photosensitive substance on the outer periphery of an aluminum drum when manufacturing a photosensitive drum for an electrophotographic copying machine, for example.

As shown in FIGS. 1 and 2, the drum coating apparatus of the present invention includes a movable pump unit 10 and an elevator 20 for vertically supporting and lifting a plurality of drums 30. There is. The pump unit 10 is a storage box in which wheels 11 are provided at the four corners of the bottom surface and the top surface is open.
Have twelve. Inside the storage box 12, the coating tank 40 containing the coating liquid, the circulation pump 13 for circulating the coating liquid 1 in the coating tank 40, and the concentration and viscosity of the coating liquid 1 are stored. A circulation tank 14 for storing the circulating coating liquid 1 is provided for adjustment.

The elevator 20 has a support arm 21 that moves up and down in a horizontal state, and a lift main body 23 that internally houses a lift mechanism that moves the support arm 21 up and down.
A large number of drums 30 are vertically supported by 21. The storage box 12 of the pump unit 10 is located on the side of the elevator 20, and the drums 30 supported by the elevator 20 are located on the coating tank 40. The elevating main body 23 of the elevating machine 20 includes a tank unit that is located on the side of the elevating main body 23.
A pair of tank support arms 22 and 22 for supporting the ten coating tanks are provided. Each tank support arm 22 is supported by an elevating / lowering body 23 so as to be able to ascend and descend in a horizontal state, and a lift-up mechanism 25 such as a cylinder is provided on the upper surface thereof.

The coating tank 40 housed in the housing box 12 of the tank unit 10 is provided with a pair of flange portions 41 extending laterally in a horizontal state on each side of the upper end portion.
Then, the storage box 12 of the tank unit 10 is positioned below the flange portion 41 of the coating tank 40 stored in the storage box 12 when the storage box 12 is positioned on the side of the elevating main body 23. When each tank support arm 22 is at a predetermined height position and the flange portion 41 of the coating tank 40 is located on each tank support arm 22, each tank support arm 22 is lifted and the coating tank 40 is It is supported on each tank support arm 22 through a lift-up mechanism 25 so as not to interfere with the storage box 12.

The lower portion of the coating tank 40 is connected to the upper portion of the circulation tank 14 via a flexible hose 42 in a communicating state. The bottom of the circulation tank 14 is connected to the suction side of the circulation pump 13 in a communication state. The discharge side of the circulation pump 13 is connected to the bottom of the coating tank 40 via a flexible hose 45 in a communicating state. The circulation pump 13 circulates the coating liquid 1 in the coating tank 40 to the circulation tank 14, and the concentration and viscosity of the coating liquid 1 are kept constant in the circulation tank 14. The coating liquid 1 whose concentration and viscosity have been adjusted is circulated in the coating tank 40 by the circulation pump 13.

In the coating apparatus having such a structure, the housing box 12 of the pump unit 10 is positioned on the side of the main body 23 of the elevator 20 and each flange portion 22 of the coating tank 40 in the housing box 12 is positioned. Each tank support arm in the elevator 20
Each tank support arm 22 is raised and lowered so as to be supported by 22. When the coating tank 40 is supported by each tank support arm 22 without interfering with the storage box 12, the circulation pump 13 circulates the coating liquid 1. In this state, the support arm 21 that supports each drum 30 is lowered above the coating tank 40,
Each drum 30 is immersed in the coating liquid 1 in 40. After that,
The support arm 21 is used so that the drum 30 exits from the coating liquid 1.
Raise. As a result, each drum 30 becomes a coating tank.
The coating liquid 1 is pulled up from the coating liquid 1 in the 40, and the coating liquid is applied to the outer peripheral surface of each drum 30.

At this time, since the vibration of the circulation pump 13 is absorbed by the flexible hoses 42 and 45, it is hardly transmitted to the coating tank 40, and the liquid level of the coating liquid 1 in the coating tank 40 is There is no risk of vibration. Moreover, since the coating tank 40 is in a state where it does not interfere with the storage box 12 in which the circulation pump 13 is stored, there is no possibility that the vibration of the circulation pump 13 is directly transmitted to the coating tank 40.

[0016]

As described above, the drum coating apparatus of the present invention is separate from the storage box so that the coating tank in the storage box in which the circulation pump is stored does not interfere with the storage box. Since the coating liquid in the coating tank is circulated while the drum is immersed in the coating liquid while being supported by the elevator, the coating in the coating tank by the circulation pump is performed. The coating liquid can be uniformly applied to the drum without the risk of the liquid vibrating. Further, since the coating tank is arranged in the storage box in which the circulation pump and the circulation tank are stored, the occupied space becomes small.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a drum coating apparatus of the present invention.

FIG. 2 is a side view of the drum coating device.

3A is a front view of a conventional coating apparatus, and FIG. 3B is a side view thereof.

FIG. 4 is a front view showing another example of the tank unit in the conventional coating apparatus.

[Explanation of symbols]

 10 Pump unit 12 Storage box 14 Circulation tank 13 Circulation pump 20 Elevator 22 Tank support arm 30 Drum 40 Coating tank 42, 45 Flexible hose

Claims (1)

[Claims] 1. A coating tank containing a coating liquid, a circulation pump for circulating the coating liquid in the coating tank, and a circulation tank for storing the coating liquid circulated by the circulation pump. A tank unit having a storage box that stores these so as to be able to move integrally, and a tank unit that is provided separately from the tank unit, and vertically supports the drum to which the coating liquid is applied on the outer peripheral surface. In addition, a drum coating apparatus comprising: an elevator for moving up and down the coating tank and the drum relatively without interfering with the coating box of the tank unit.