JPH06328019A - Drum chucking device - Google Patents

Abstract

PURPOSE:To provide a drum chucking device smoothly operated to stably hold various drums having different inner diameters from the inner peripheral surfaces thereof. CONSTITUTION:A drum chucking device is equipped with an energizing mechanism P consisting of the first slope part P1 formed to the surface opposed to a holding arm 6 of the outer periphery of a movable shaft 3 in the longitudinal direction of the movable shaft 3 and the second slope part P2 formed to the holding arm 6 for energizing the holding arm 6 outwardly at the time of the contact with the first slope part P1 and a play mechanism R operating the connection mechanism Q moving the holding arm 6 after the contact with the first and second slope parts P1, P2 of the energizing mechanism P. By this constitution, the drum chucking device operated smoothly to stably hold various drums having different inner diameters from the inner peripheral surfaces thereof is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum chucking device, which is used, for example, for manufacturing an electrophotographic photosensitive drum in which a photosensitive material is applied to the outer peripheral surface of a drum, and which holds a cylindrical drum from its inner surface side. The present invention relates to a drum chucking device.

[0002]

2. Description of the Related Art A photoconductor drum used in an electrophotographic copying machine has a process of degreasing and cleaning the outer peripheral surface of an aluminum drum, a process of applying a photosensitive material to the degreased and cleaned outer peripheral surface, and a drum outer peripheral surface. It is manufactured by sequentially performing a step of heating the photosensitive material applied to the surface to form a photosensitive layer. In these processes, a drum chucking device that holds the drum from the inner peripheral surface side is used to protect the outer peripheral surface of the drum to which the photosensitive material is applied and the photosensitive material applied to the outer peripheral surface of the drum. It was For example, in the step of degreasing and cleaning the outer peripheral surface of the drum, a large number of drums are held vertically by the drum chucking device and are sequentially transferred to a plurality of cleaning layers. In addition, in the step of applying the photosensitive substance to the outer peripheral surface of the degreased and washed drum, for example,
A dipping method is employed in which the drum is vertically dipped in the coating liquid, and then the drum is withdrawn from the coating liquid in the axial direction thereof at a predetermined speed. Even in such an immersion method, a drum chucking device that holds the drum from the inner peripheral surface side has been used.

[0003]

However, the conventional drum chucking device as described above has the following problems. (1) In the degreasing and cleaning process of the outer peripheral surface of the drum used for manufacturing the electrophotographic photosensitive drum, the drum cannot be reliably held by the conventional drum chucking device for some reason, and either cleaning is performed. The drum may remain in the tank. In such a case, usually, the operator manually pulls up the drum, or the operator operates an appropriate jig to pull up the drum to take it out of the cleaning tank. However, when the operator directly pulls up the drum by hand, it is necessary to drain the washing liquid in the washing tank when pulling up the drum, which causes a problem that workability is deteriorated. Further, since the worker enters the cleaning tank after the cleaning liquid in the cleaning tank is discharged, the cleaning tank may be contaminated with dust or the like, and the drum cleaning degree may be deteriorated. Furthermore, the vapor of the cleaning liquid remaining in the cleaning tank may adversely affect the human body. On the other hand, such a problem does not occur when the drum is taken out of the cleaning tank with a jig. However, the conventional jig has a problem that it is locked only to a drum having a specific inner diameter. Therefore, it is necessary to prepare various types of jigs according to the inner diameter of the drum. In addition, even if a jig having a size corresponding to the inner diameter of the drum is used, the drum is not stably held by the jig,
The drum may fall from the jig during the pulling up. (2) The drum chucking device used in the step of applying the coating liquid to the outer peripheral surface of the drum can hold only the drum having a specific inner diameter, like the above-mentioned jig for pulling up the drum. Therefore, every time the diameter of the drum is changed, it is necessary to replace the drum chucking device with one capable of holding a drum having a predetermined inner diameter, which significantly lowers workability. Also, when replacing the drum chucking device,
Since dust is generated, there is also a problem that the cleanliness of the drum coating chamber deteriorates. SUMMARY OF THE INVENTION In order to solve the problems in the prior art, the present invention improves a drum chucking device and can smoothly operate and stably hold various drums having different inner diameters from the inner peripheral surface side. An object of the present invention is to provide a chucking device.

[0004]

In order to achieve the above object, the present invention provides a guide cylinder arranged coaxially with the shaft center of a drum to be held, and an axial direction of the guide cylinder in the guide cylinder. A movable shaft body slidably supported on the movable shaft body, and a first link member in a predetermined plane parallel to the axis of the movable shaft body, one end of which is rotatably supported by the movable shaft body. When,
A second link member in the same plane as the predetermined plane, one end of which is rotatably supported by the guide cylinder;
The movable shaft is arranged around the movable shaft so as to be located on the same circle about the shaft center of the movable shaft, and the movable shaft is moved along with the relative movement of the movable shaft with respect to the guide cylinder. The first and second portions are moved so as to move in the radial direction approaching and separating from the shaft center of the shaft body by an equal distance while maintaining the parallel state.
A plurality of holding arms axially supported on the other ends of the link members, and the movable shaft body attached to the guide cylinder in order to move the holding arms in a direction away from the axis of the movable shaft body. A drum chucking device including a biasing means for biasing, wherein a first sloped portion in the longitudinal direction of the movable shaft body is formed on a surface of the movable shaft body facing the holding arm. A biasing mechanism comprising a second sloped portion formed on the holding arm for biasing the holding arm outward when the first biasing portion is contacted, and the biasing mechanism described above. A play mechanism for operating the chain mechanism including the guide cylinder, the movable shaft body, the first and second link members, and the holding arm is provided after the contact between the first sloped surface portion and the second sloped surface portion. It is configured as a drum chucking device.

[0005]

According to the present invention, the guide cylinder is coaxially arranged at the shaft center of the drum to be held, and the movable shaft is slidably supported in the axial direction of the guide cylinder. One end of the first link member in a predetermined plane parallel to the axis is rotatably supported by the movable shaft body in the predetermined plane, and is in the same plane as the predetermined plane. One end of the second link member is rotatably supported by the guide cylinder in the same plane so as to be positioned on the same circle around the movable shaft body about the axis of the movable shaft body. The plurality of holding arms arranged are parallel to each other by an equal distance in the radial direction in contact with and away from the shaft center of the movable shaft, as the movable arm moves relative to the guide cylinder in the shaft center direction. So as to move with the other ends of the first and second link members respectively. When the movable shaft is urged against the guide cylinder by the urging means in order to move each holding arm in the state away from the axial center of the movable shaft in this state, the movable shaft is moved. A first inclined surface portion in the longitudinal direction of the movable shaft body formed on a surface of the outer periphery of the body facing the holding arm, and the holding arm is attached outward when contacting the first inclined surface portion. In the biasing mechanism including the second slope portion formed on the holding arm for biasing, the guide cylinder and the movable body are moved by the play mechanism after the contact between the first slope portion and the second slope portion. The chain mechanism including the shaft, the first and second link members, and the holding arm is operated.
Therefore, after inserting the holding arms into various drums with different inner diameters in the initial state in which they are close to the axis of the movable shaft, the holding arms are urged outward by the urging mechanism and the chain mechanism is formed by the play mechanism. The initial state can be easily released by delaying the operation of. , And each holding arm moves in the radial direction away from the movable shaft by an equal distance. The inner peripheral surface of the drum is pressed by each of the moved holding arms, and the drum is stably held. The external force may be automatically generated by mechanical means or manually. As a result, it is possible to obtain a drum chucking device which operates smoothly and can stably hold various drums having different inner diameters from the inner peripheral surface side.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. 1 is a front view showing a schematic structure of a drum chucking device according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a change of the drum chucking device from an initial state, and FIG. 3 is a drum chucking device. It is explanatory drawing which shows the partial force relationship applied during operation | movement of a king apparatus. The drum chucking device according to this embodiment is used, for example, to take out a drum used for manufacturing an electrophotographic photosensitive drum from a cleaning tank.
The drum in the cleaning tank is placed vertically on the bottom of the cleaning tank while being immersed in the cleaning liquid. This drum chucking device is, as shown in FIG. 1, a guide cylinder 2 arranged coaxially with the axial center of the drum 1 to be held, and supported by the guide cylinder 2 so as to be slidable in the axial direction of the guide cylinder. And a movable shaft 3 (corresponding to a movable shaft body) and one end of which is rotatably supported on the movable shaft 3 at shaft fulcrums A and A'in a plane parallel to the axis of the movable shaft 3. The parallel links 4 and 4 '(corresponding to the first link member) and one end thereof are rotatably supported by the guide cylinder 2 at the shaft fulcrum B in the same plane as the above plane. Auxiliary link 5 (corresponding to the second link member)
And are arranged around the movable shaft 3 so as to be located at equal intervals on the same circle with the shaft center of the movable shaft as the center, and as the movable shaft 3 moves relative to the guide tube 2 in the axial direction, Axial fulcrums C and C'are provided at the other ends of the parallel links 4 and 4'and the auxiliary link 5 so as to move in the radial direction approaching and separating from the axis of the movable shaft 3 by an equal distance while maintaining the parallel state. ，
Three holding arms 6 each axially supported by D, and a compression spring for urging the movable shaft 3 against the guide cylinder 2 so as to move the holding arms 6 in a direction away from the axis of the movable shaft 3. 7 (corresponding to urging means), and a first inclined surface portion P1 in the longitudinal direction of the movable shaft formed on a surface facing the holding arm 6 on the outer periphery of the movable shaft 3, and a first inclined surface. A biasing mechanism P including a second slope portion P2 formed on the holding arm for biasing the holding arm 6 outward when it abuts against the portion P1, and a first slope surface of the biasing mechanism P. A play mechanism R for actuating a chain mechanism Q including the guide cylinder 2, the movable body 3, the parallel links 4, 4 ', the auxiliary link 5, the holding arm 6 and the like after the contact between the portion P1 and the second slope portion P2. And are provided. As the play mechanism R, for example, elongated holes R1 and R1 ′ in the axial direction of the movable shafts are formed at the axial fulcrums A and A ′ of the parallel links 4 and 4 ′ on the movable shaft 3 side.

The drum chucking device of this embodiment having such a structure is used as follows when, for example, the drum 1 remaining in the cleaning tank is taken out (FIG. 2 (a)).
(See (c)). First, the guide cylinder 2 is grasped by a hand, and the flange portion 9 of the movable shaft 3 is pushed so as to approach the flange portion 8 of the guide cylinder 2 against the biasing force of the compression spring 7. As a result, the movable shaft 3 moves downward in the figure, and the holding arms 6 held by the parallel links 4, 4'and the auxiliary link 5 radiate so as to approach the axis of the movable shaft 3. Move in parallel with the direction. 3 holding arms 6
When the movable shaft 3 is moved until the diameter of the circle formed by the outer surface of the drum 1 becomes smaller than the inner diameter of the drum 1, each arm holding portion 6 is moved downwards with the holding arms 6 down.
It is inserted inside (initial state) (see FIG. 2A). In this initial state, it is necessary to make each holding arm 6 as close as possible to the movable shaft 3 so as to be compact so as to accommodate a drum having a small inner diameter. As a result, parallel links 4, 4 '
Angle between the movable shaft 3 and the auxiliary link 5 and the guide tube 2
The angle between and is very small. This means that even if the pushing force applied to the movable shaft 3 is released in the next step, the urging force of the compression spring 7 causes the guide cylinder 2,
It becomes difficult to operate the chain mechanism composed of the movable shaft 3, the parallel links 4, 4 ', the auxiliary link 5, and the holding arm 6 against the frictional force applied to each of the shaft fulcrums A to D, and it is difficult to separate from the initial state. Means to become. Here, the condition for leaving the initial state is derived using FIG. 3 (in the figure, each link is represented by 4).

The urging force F exerted by the compression spring 7 on the movable shaft 3 is the axial component force F1 of the link 4 and its orthogonal component force F.
It can be decomposed into 2. The component force F2 in the perpendicular direction is the axial fulcrum C
Rotation moment M counterclockwise in the figure
Cause On the other hand, the axial component force F1 is applied to the shaft fulcrum A and the shaft fulcrum C via the link 4, and these shaft fulcrums A,
A frictional force F1 'is generated on C. This frictional force F1 'produces a reverse rotation moment M'in the direction opposite to the rotation moment M (clockwise direction in the figure). Therefore, the above-mentioned disengagement condition is achieved when the rotational moment M exceeds the reverse rotational moment M ', and can be expressed by the following equation. M> M '... (1) M = F2.L = F.L.sin.theta. (2) M' = 2F1'.r = 2.mu.F.r.cos.theta. (3) where L is the axial fulcrum A , C, θ is the angle between the link 4 and the axis of the movable shaft 3, μ is the coefficient of friction, and r is the axial radius of the fulcrums A and C. In the above equation (1), (2) and (3)
By substituting the expressions, the following conditional expressions were derived. θ> tan ⁻¹ (2 μ · r / L) (4) In reality, there is a demand for compactness that does not satisfy the above conditional expression. Therefore, in the drum chucking device of this embodiment, the biasing mechanism P is provided to bias the holding arm 6 outward when the holding arm 6 is disengaged from the initial state.
However, when the urging mechanism P is simply provided, when the first slope P1 comes into contact with the second slope P2, the chain mechanism Q
Try to produce an irregular movement that is constrained. This irregular movement hinders the movement of the biasing mechanism P. Therefore, the play mechanism R is provided to prevent anomalous movement during the contact. Next, when the pushing force applied to the movable shaft 3 is released, the movable shaft 3 is relatively moved by the biasing force of the compression spring 7 so that the flange portion 9 of the movable shaft 3 is separated from the flange portion 8 of the guide tube 2. To be done. Then, the first slope portion P1 of the biasing mechanism P contacts the second slope portion P2 to bias the holding arm 6 to the outside. At this time, the shaft fulcrums A and A'are elongated holes R1 and R, respectively.
The movable shaft 3 is attached to the parallel links 4 and 4'for floating in 1 '.
Is not transmitted. Therefore, the urging mechanism P effectively works without causing irregular movement of the chain mechanism Q, and the disengagement from the initial state is easily facilitated (see FIG. 2B). And after leaving the above initial state,
The first slope portion P ₁ of the urging mechanism P is the second slope portion P ₁ .
2, the shaft fulcrums A and A'abut on the ends of the elongated holes R and R ', respectively, and the urging force of the movable shaft 3 is transmitted to the parallel links 4 and 4'. That is, the chain mechanism R operates after the contact between the _first slope portion P ₁ and the second slope portion P2 of the biasing mechanism P (see FIG. 2C).

That is, the urging force of the compression spring 7 relatively moves the flange portion 9 of the movable shaft 3 away from the flange portion 8 of the guide cylinder 2, and the three holding arms 6 are moved.
It moves while keeping parallel to the radial direction away from the axis of. Since the maximum diameter of the circle on which the outer surface of each of the three holding arms 6 is located is larger than the inner diameter of the drum 1, each holding arm 6 is held before the compression spring 7 reaches the maximum length.
The outer surface of the drum is pressed against the inner peripheral surface of the drum 1. Since each holding arm 6 presses the three circumferentially equidistant positions on the inner peripheral surface of the drum 1 along the axis of the drum 1, the drum 1 is reliably held by each holding arm 6. When the drum 1 is held by each holding arm 6, the entire drum chucking device is lifted up. As a result, the drum 1 is taken out from the cleaning tank. As described above, in the drum chucking device of the present embodiment, the three holding arms 6 are moved in the radial direction so as to approach and move away from the axis of the movable shaft 3, so that the drums 1 having different inner diameters can be safely operated. Can be held. Further, when the drum 1 is taken out from the cleaning tank (not shown), it is not necessary to discharge the cleaning liquid from the cleaning tank and it is not necessary to enter the cleaning tank. Furthermore, since the drum 1 is securely held in the drum chucking device,
There is no fear that the drum 1 will be detached from the drum chucking device during the removal of the drum 1. As a result, it is possible to obtain a drum chucking device which operates smoothly and can stably hold various drums having different inner diameters from the inner peripheral surface side. In the above embodiment, three pairs of chain mechanisms are provided, but in actual use, two pairs or four or more pairs may be provided.
However, it is considered that 3 pairs are optimal in terms of drum holding performance and processing accuracy of the device. In the above embodiment, the first link member is a parallel link composed of two links, but in actual use, one link or three or more parallel links may be used. However, two parallel links are desirable in terms of drum holding performance. Further, the second link member may be a parallel link. In the above embodiment, the compression spring 7 is used as the urging means, and the external force is manually applied in the initial state. Instead of these, a drive source (mechanical means) such as a servo motor is used to apply the external force. May also be generated automatically, in which case it is necessary to provide a connecting portion with this drive source instead of the flange portion 9 at the upper end portion of the movable shaft 3.

[0010]

Since the drum chucking device according to the present invention is constructed as described above, it is in an initial state in which each holding arm is brought close to the axial center side of the movable shaft body in various drums having different inner diameters. After the insertion, the holding arm is urged outward by the urging mechanism and the operation of the chain mechanism is delayed by the play mechanism, so that the initial state can be easily released. After separation from the initial state, the multiple holding arms arranged around the movable shaft move in parallel with each other in the radial direction approaching and separating from the axis of the movable shaft while maintaining the same parallel state. Therefore, various drums having different inner diameters can be reliably held. Therefore,
There is no need to prepare a drum chucking device according to the inner diameter of the drum. Moreover, since the drum is reliably held from the inner surface side by each holding arm, there is no fear that the drum will come off from each holding arm. As a result, it is possible to obtain a drum chucking device which operates smoothly and can stably hold various drums having different inner diameters from the inner peripheral surface side.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a drum chucking device according to an embodiment of the first invention.

FIG. 2 is an explanatory diagram showing a change from an initial state of the drum chucking device.

FIG. 3 is an explanatory diagram showing a partial force relationship applied during the operation of the drum chucking device.

[Explanation of symbols]

 1 ... Drum 2 ... Guide tube 3 ... Movable shaft (corresponding to movable shaft) 4, 4 '... Parallel link (corresponding to first link member) 5 ... Auxiliary link (corresponding to second link member) 6 ... Holding Arm 7 ... Compression spring (corresponding to biasing means) P ... Biasing mechanism P1 ... First slope portion P2 ... First slope portion Q ... Chain mechanism R ... Play mechanism

Claims (1)

[Claims] 1. A guide cylinder arranged coaxially with the shaft center of a drum to be held, a movable shaft body slidably supported by the guide cylinder in the axial direction of the guide cylinder, and the movable shaft. A first link member in a predetermined plane parallel to the axis of the body, one end of which is rotatably supported by the movable shaft; and a first link member in the same plane as the predetermined plane. The second link member, one end of which is rotatably supported by the guide cylinder, is arranged around the movable shaft body so as to be located on the same circle around the axis of the movable shaft body. With the relative movement of the movable shaft body with respect to the guide tube in the axial direction, the first shaft is moved so as to move in the radial direction approaching and separating from the shaft center of the movable shaft by an equal distance while maintaining the parallel state. A plurality of holding arms pivotally supported on the other ends of the first and second link members, respectively A drum chucking device comprising: a biasing unit that biases the movable shaft body against the guide cylinder so as to move the arm in a direction away from the axis of the movable shaft body. A first inclined surface portion in the longitudinal direction of the movable shaft body formed on the surface of the outer periphery of the movable shaft body facing the holding arm, and urges the holding arm outward when abutting against the first inclined surface portion. And a guide mechanism for delaying contact between the first slope and the second slope in the biasing mechanism and a second slope formed on the holding arm. A drum chucking device provided with a movable shaft, a play mechanism for operating a chain mechanism including first and second link members, and a holding arm.