JPH0538864Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a chucking device for a cylindrical drum,
In particular, the present invention relates to a drum chucking device that can reliably hold the drum from the inside and prevent the coating liquid from penetrating into the inside of the drum when coating the outer peripheral surface of the drum by a dipping method.

(Prior Art) In the dip coating method in which a cylindrical drum is immersed in a coating liquid and its outer peripheral surface is coated, firstly, the drum is supported from inside the drum because the outer peripheral surface of the drum cannot be touched directly; Second, it is necessary to prevent the coating liquid from entering the inside of the drum.
For example, as shown in FIG. 4, a robot hand 101 for supporting the drum is provided and a lid 102 is provided at the bottom of the drum. However, the robot hand 101 cannot hold the drum 100 in a stable state because it is supported at two points, for example. The thin-walled drum 100 may also be deformed. Furthermore, in this method, it takes time and effort to attach and detach the lid 102 when performing the coating operation continuously. It is also necessary to clean the lid 102 after each process. Therefore, the coating operation becomes extremely inefficient.

In order to solve such problems, for example,
As shown in FIG. 5, a chucking device may be considered that is provided with an elastic sealing material 104 that can expand and contract in the circumferential direction in response to the injection and degassing of pressurized air 103. However, this method
4 cannot expand and contract uniformly in the circumferential direction, so the positional accuracy of chucking is low. Furthermore, the elastic sealing material 104 must be provided on the frame 105 in an airtight and slidable manner, which makes the device complicated.

(Problems to be Solved by the Invention) The present invention solves the problems of the prior art described above, and its purpose is to provide a chucking device that can securely hold a cylindrical drum from the inside without deforming it. There is a particular thing. Another object of the present invention is to provide a drum chucking device that can prevent the coating liquid from entering the drum when coating the outer peripheral surface of a cylindrical drum by the dipping method. Still another object of the present invention is to provide a drum chucking device in which the drum holding means also serves as means for preventing the coating liquid from entering the inside of the drum. Still another object of the present invention is to provide a drum chucking device which has a simple mechanism and can therefore be operated easily, quickly and continuously.

(Means for Solving the Problems) The drum chucking device of the present invention includes a pressurizing device and a device that elastically deforms in the circumferential direction by the pressurizing device and tightly adheres to the inner circumferential surface of a cylindrical drum in an air-liquid tight manner. The above object is thereby achieved.

The present invention is characterized in that the inside of the drum is supported in an air-liquid tight manner along the circumference by elastic deformation of the elastic member. Thereby, the drum is reliably held in a stable state without deformation. Even when coating the outer peripheral surface of the drum by the dip coating method, it is possible to prevent the coating liquid from entering the inside of the drum without providing a separate sealing mechanism.

(Example) The present invention will be described below with reference to embodiments.

As shown in FIG. 1, the drum chucking device 1 of the present invention includes, for example, a pressure means 11 and an elastic member 12 that is elastically deformed in the circumferential direction by the pressure means 11.
and has. This device 1 is placed inside a cylindrical drum 2 to be chucked.

The pressure means 11 includes a support rod 111 that supports the elastic member 12 in the drum circumferential direction, and an elastic member pressing plate 112 that is disposed on the support rod 111 so as to be slidable in the drum axial direction. The shapes of the support rod 111 and the pressing plate 112 are not particularly limited, and may be any shape that can sandwich the elastic member 12 and press the elastic member 12 evenly. The pressing means 11 further includes a pressing means 113 that presses the pressing plate 112 relative to the support rod 111 in the direction of the drum axis and elastically deforms the elastic member 12 in the circumferential direction of the drum. The pressing means 113 may be any means as long as it presses the elastic member 12 and imparts a desired amount of elastic deformation. For example, hydraulic or pneumatic cylinders, spring means, a prime mover and rack-and-pinion combination, or compressed air.

The elastic member 12 has a ring shape, for example, and is held between the support rod 111 and the pressing plate 112. The elastic member 12 is elastically deformed in the circumferential direction by being pressed by the pressing means 113, and is brought into close contact with the drum inner circumferential surface 20 in an air-liquid tight manner. drum 2
In this way, the support rod 1 is connected via the elastic member 12.
11. Moreover, drum 2
is not deformed. Further, since the support is based on elastic deformation, high precision is not required for attaching the elastic member 12, and airtightness is not required. Furthermore, since the response to pressure is quick, the drum 2 can be supported instantly. Since the degree of elastic deformation can be predicted in advance, the accuracy of the chucking position of the drum 2 is also high.The elastic member 12 has a strength and elasticity that can sufficiently withstand the pressing force of the pressure means 11 and the frictional force with the drum 2. Those having the following are used as appropriate. Needless to say, it is insoluble in coating liquids. Examples include packing made of synthetic resin or rubber.

In the device 1 of the present invention, as shown in FIG. 3, the elastic members 12 can be provided in two or more stages, for example, with spacers 114 interposed therebetween. This prevents the drum 2 from wobbling due to buoyancy when the drum 2 is immersed in the coating liquid 30. The device 1 of the present invention is suitably used in fields that require extremely fine detail and high precision, such as the manufacture of photosensitive drums for electrophotography, but it can of course be applied to other fields as well.

(Function) For example, as shown in FIGS. 2 and 3, when coating the outer peripheral surface of the cylindrical drum 2 by the dipping method, the chucking device 1 functions as follows. First, the chucking device 1 with the elastic member 12 attached to the pressure means 11 is inserted into the drum 2, and arranged so that the elastic member 12 is located near the lower end of the drum 2. Then, the elastic member 12 is pressed by the pressing means 13. The elastic member 12 is elastically deformed in the circumferential direction and is in close contact with the drum inner circumferential surface 20 in an air-liquid tight manner. As a result, the chucking device 1
Reliably connect and support. Next, by pulling down the chucking device 1, the drum 2 is immersed in the coating liquid 30 in the coating liquid storage tank 3. Since the drum 2 is circumferentially supported by the elastic member 12, it is held in a stable state. Wobble caused by buoyancy is also minimized. Since the pressurized state of the elastic member 12 is maintained continuously, the elastic member 12 seals the drum inner circumferential surface 20 in an air-liquid tight manner, and as a result, the coating liquid 30 is prevented from penetrating into the drum 2. Ru. At this time, since air is retained within the drum 2, the drum 2 is not deformed by the hydraulic pressure of the coating liquid 30. Next, the drum 2 is taken out from the coating liquid 30 by lifting the chucking device 1 upward. Then, the drum 2 on which the predetermined coating layer has been formed is removed from the chucking device 1 by opening the pressing means 113.

(Effect of the invention) According to the device of the present invention, by elastically deforming the elastic member in the circumferential direction by the pressurizing means and bringing it into close contact with the inner peripheral surface of the drum, the drum can be reliably deformed without being deformed. Retained. When coating the outer peripheral surface of the drum using the dipping method, it has the function of preventing the coating liquid from entering the inside of the drum.
There is no need to provide a separate sealing mechanism. the result,
The device has a simple structure and is extremely easy to operate. Continuous operation is also possible and can be carried out quickly.
Therefore, the photoreceptor drum can be mass-produced and production costs can be reduced. The device of the present invention further includes:
It can be used semi-permanently by replacing the elastic member.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of the main part showing an embodiment of the present invention, FIGS. 2 and 3 are front sectional views of the main part showing an application example of the invention, and FIGS.
Each figure is a front sectional view of a main part showing an example of the prior art. DESCRIPTION OF SYMBOLS 1... Drum chucking device, 2... Cylindrical drum, 11... Pressure means, 12... Elastic member,
111... Support rod, 112... Elastic member pressing plate, 113... Pressing means.

Claims (1)

[Scope of Claim for Utility Model Registration] A drum chuck that holds a cylindrical drum in a vertical state when applying a coating liquid to the outer peripheral surface of the drum by immersing the drum in a coating liquid and letting it exit the coating liquid. The kinging device includes an elastic member disposed coaxially with the drum inside the drum, and an elastic member that comes into close contact with the inner circumferential surface of the cylindrical drum in an air-liquid tight manner when pressurized in the axial direction. A drum chucking device comprising: a pressurizing means for pressurizing the elastic member in the axial direction.