JPH0648438Y2 - Electrode member for continuity test of photoconductor drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is used in an image forming apparatus such as an electrophotographic copying machine and has a flange at the end of a conductive drum body having a non-conductive layer formed thereon. When manufacturing the attached photoconductor drum,
The present invention relates to an electrode member used in an apparatus for testing electrical continuity between a conductive drum body of a photosensitive drum and a conductive member attached to a flange.

(Prior Art) In an image forming apparatus such as an electrophotographic copying machine, a photosensitive drum having a photosensitive layer coated on the outer peripheral surface is used. The photosensitive drum includes a drum body having a non-conductive alumite layer formed on the surface of the aluminum tube by alumite-treating the surface of the conductive aluminum tube, and a drum body having a photosensitive layer coated on the outer peripheral surface thereof, and the drum body. It is configured by a flange fitted to an end of the main body and integrally rotated with the drum main body, and a rotary shaft supported by the main body of the image forming apparatus is mounted on the flange.

In such a photosensitive drum, the alumite treatment layer functions as a barrier layer that prevents charges from being injected from the aluminum tube to the photosensitive layer, and improves the adhesiveness between the aluminum tube and the photosensitive layer. It improves the thermal stability of the photosensitive layer. Further, the alumite treatment layer protects the surface of the aluminum base tube and also functions as a protective layer for preventing the photosensitive layer from being damaged when the photosensitive layer is formed on the outer peripheral surface of the aluminum base tube.

In the photoconductor drum, it is necessary to ground a conductive aluminum tube having a photoconductive layer formed on the outer peripheral surface thereof. However, since the photosensitive drum has a photosensitive layer formed on the outer peripheral surface and is supported by the main body of the image forming apparatus so as to rotate, it is normally an insulating material attached to the end of the aluminum tube. The ground wire is pulled out through the flange of and grounded.

However, since the aluminum tube has an insulating alumite treatment layer formed on its surface, in order to ground the aluminum tube, the alumite treatment layer is removed from the aluminum tube to form an aluminum tube. It is necessary to connect the ground wire. Therefore, a part of the alumite treatment layer of the aluminum base pipe is peeled off to the flange, a conductive member electrically connected to the aluminum base pipe is attached, and the flange is attached to the drum body whose outer peripheral surface is coated with the photosensitive layer. At this time, the conductive member and the aluminum base pipe are electrically connected. As described above, when the flange to which the conductive member is attached is attached to the end portion of the drum body, the conductive member is electrically connected to the aluminum element pipe in the drum body, and therefore, the ground wire is connected to the conductive member. The grounding of the drum body can be performed by pulling out the grounding wire from the flange.

The conductive member attached to the flange usually peels off the alumite treatment layer of the drum main body when the flange is attached to the end of the drum main body, thereby peeling the alumite treatment layer from the aluminum base pipe Connected. However, an image cannot be formed when the conductive member is not securely connected to the aluminum base pipe, so the aluminum base pipe of the conductive member and the drum main body cannot be formed because the flange is attached to the drum body. You need to make sure that and are electrically connected securely.

For this reason, a continuity test between the conductive member and the drum main body is performed in a state where the flange to which the conductive member is attached is attached to the drum main body. In this continuity test, usually, a flange to which a conductive member is attached is attached to the drum body, and the drum body is made vertical so that the flange attachment portion is on the lower side and the other open end is on the upper side. It is carried out in a transfer line that is transported by In the continuity test, the upper end surface of the drum main body to which the flange is not attached is ground with a file or the like to peel off the alumite treatment layer to expose the aluminum raw pipe, and the aluminum raw pipe portion of the upper end face and the drum main body. It is implemented by applying a voltage between the conductive member of the flange attached to the lower end portion.

(Problems to be solved by the invention) In such a conventional continuity test, since the upper end surface of the conveyed drum body is shaved by hand, the workability is poor and the manufacturing efficiency of the photoconductor drum is reduced. There's a problem. In addition, since the shavings scatter around, the shavings may adhere to the photosensitive layer on the outer peripheral surface of the drum body that is being conveyed, and the photosensitive layer may be adversely affected.

The present invention solves the above-mentioned conventional problems, and an object thereof is to conduct a continuity test between a conductive member of a flange mounted on a drum body and the drum body without adversely affecting the conveyed drum body. Very easy to do, so
An object of the present invention is to provide an electrode member for a continuity test device for a photosensitive drum, which significantly improves the test efficiency.

(Means for Solving the Problems) The electrode member for the continuity test of the photoconductor drum of the present invention has a flange attached to one end of the drum body in which the non-conductive material layer is formed on the conductive tube. An electrode member used for testing electrical continuity between the raw material pipe and the conductive member in the production of a photoconductor drum in which the conductive member attached to the flange and the raw material pipe are in a conductive state, The drum body is provided so as to vertically support the drum body in a state where the end surface on the side opposite to the flange mounting side is placed, and a portion corresponding to a contact portion with the end surface of the drum body is provided. , Has an electrode portion whose upper surface serves as a sawtooth-shaped cutting portion, and thereby achieves the above object.

(Embodiment) An embodiment of the present invention will be described below.

The electrode member for a continuity test device of a photoconductor drum of the present invention is used for the continuity test performed in the process of manufacturing the photoconductor drum. In the continuity test, as shown in FIG. 1, the surface of the conductive aluminum tube is alumite-treated to form an alumite layer, and the drum body 30 having the outer peripheral surface coated with the photosensitive layer is conveyed. It is carried out on the transfer line.

The flange 40 attached to one end of the drum body 30 is
Except for the abutting portion 41 on one end face, it is press-fitted into the drum body 30. A through hole 42 is formed at the axial center of the flange 40. A conductive member 50 is attached to an end of the flange 40 that is press-fitted into the drum body 30.
The conductive member 50 is made of a conductive metal such as stainless steel,
The drum body 30 has a disc shape having an inner diameter slightly smaller than the inner diameter of the drum body 30, and a plurality of outwardly projecting locking projections 51 are provided at appropriate intervals in the circumferential direction on the outer peripheral edge thereof. There is. A through hole is also formed in the axial center portion of the conductive member 50, and a locking projection 52 projecting inward is also provided in the peripheral edge portion of the through hole.

When the flange 40 is press-fitted into the drum main body 30 except for the protruding portion 41, the respective locking protrusions 51 of the conductive member 50 are released.
The inner peripheral surface is locked and the alumite treatment layer on the inner peripheral surface is scraped off. Then, each locking projection 51 and the aluminum element pipe in the drum body 30 are electrically connected.

A cylindrical electrical connection member 60 made of a conductive metal or the like is inserted into the through hole 42 of the flange 40. The electrical connection member 60, the outer peripheral surface is in contact with the locking projection 52 protruding inward of the conductive member 50, by this,
Both are electrically connected.

The continuity test of the photosensitive drum is performed when the flange 40 is attached to one end of the drum body 30. In the continuity test, when the flange 40 is attached to the end of the drum body 30, the first electrode member 20 is in electrical contact with the electrical connection member 60 inserted into the through hole 42 of the flange 40, A voltage is applied by a power source 71 between the drum body 30 and the electrode member 10 of the present invention which is in contact with the lower open end surface of the drum body 30.
Is checked by the current value of the ammeter 72 connected in series.

The first electrode member 20 inserted into the through hole 42 of the flange 40 is
The tip end portion has a conical shape, and the conical tip end portion is fitted into one end portion of the cylindrical electric connection member 60 to ensure electrical connection.

The electrode member 10 of the present invention has a cylindrical shape made of aluminum or the like, and has a support base portion with its upper end closed.
Having 11. The support base 11 has an outer diameter that is sufficiently larger than the inner diameter of the drum body 30 to be inspected for continuity, and is vertical. A guide portion 12 is provided on the upper surface of the support base portion 11 so as to be concentric with the support base portion 11 and project upward. The guide portion 12 is a drum body 30 to be inspected for continuity.
2 has a diameter slightly smaller than the inner diameter thereof, and as shown in FIG. 2, a flat guide surface 12a is formed by cutting out a part of the entire length along the axial direction. Then, the drum body 30 is fitted onto the guide portion 12.

An annular electrode portion 13 is arranged around the guide portion 12 on the upper end surface of the support base 11. The electrode portion 13 is made of, for example, a conductive material such as stainless steel, and is placed on the upper surface of the support base portion 11 and fixed to the upper surface of the support base portion 11 with a flat annular support portion 13a. The supporting portion 13a has a cutting portion 13b which is provided so as to project upward from the inner peripheral portion of the supporting portion 13a and whose upper surface has a saw-toothed concavo-convex shape. The cutting portion 13b is sized so that the end surface of the drum body 30 to be subjected to the continuity test can be brought into contact with the cutting portion 13b, and the open lower end surface of the drum body 30 is brought into contact with the cutting portion 13b. Placed. Then, by pressing the drum body 30 downward, the lower end surface of the drum body 30 is cut by the cutting portion 13b. A lead wire 14 is connected to the electrode portion 13, and the lead wire 14 extends through the through hole formed in the support base portion 13a to the outside.

The photoconductor drum continuity test apparatus is implemented as follows.

The drum main body 30 having a photosensitive layer formed on the outer peripheral surface and conveyed in a vertical state is mounted on the cutting portion 13b having the serrated upper surface of the electrode portion 13 of the electrode member 10 of the present invention. It In such a state, the flange 40 is press-fitted into the upper end of the drum body 30. When the flange 40 is press-fitted into the drum body 30, the drum body 30 is pressed downward, and the lower end surface of the drum body 30 is pressed against the serrated upper surface of the cutting portion 13b. As a result, the lower end surface of the drum body 30 is cut by the cutting portion 13b, the alumite treatment layer of the drum body 30 is removed, and the aluminum tube and the cutting portion 13b are removed.
And come into contact with each other, and the two are electrically connected.

In such a state, the conical shape of the tip end portion of the first electrode member 20 is inserted into the cylindrical electric connection member 60 in a state of being inserted into the through hole 42 in the flange 40 attached to the upper end portion of the drum body 30. The portion is inserted to electrically connect the first electrode member 20 and the electric connecting portion 60. As a result, the conductive member 50 electrically connected to the outer peripheral surface of the electric connecting member 60 by the locking projection 52 is electrically connected to the first electrode member 20.

Then, a predetermined voltage is applied by the power source 71 between the first electrode member 20 and the lead wire 14 of the electrode member 10 of the present invention, and the aluminum part pipe of the drum body 30 from the electrode portion 13 of the electrode member 10 is applied. An electric current is applied to. As described above, when the conductive member 50 attached to the flange 40 is in a state where the alumite treatment layer of the drum body 30 is removed and the aluminum body pipe is electrically connected, a current flowing through the aluminum body pipe is generated. Flow from the conductive member 50 to the first electrode member 20. Accordingly, the first electrode member 20 and the electrode member 10 of the present invention are
It is confirmed that the ammeter 72 interposed between and shows a predetermined current value, and the conductive member 50 attached to the flange 40 and the drum body 30 are in a predetermined conductive state. In this way, when it is confirmed that the drum body 30 and the conductive member 50 attached to the flange 40 are in the conductive state, the drum body 30 placed on the electrode member 10 is placed on the transfer line. The drum main body 30 is returned to the next step on the transfer line with the flange 40 attached, and the same operation is repeated for the drum main body with the flange newly attached. , A conductivity test is performed.

FIG. 3 shows another embodiment of the electrode member of the present invention. The electrode member 80 has a support base 81 having a cylindrical shape with an open upper surface and a lower surface, and an electrode portion 83 having a cutting portion 83b on the upper surface of the support base 81 as in the above embodiment. Is attached. In the support base 81, a support shaft 85 and a columnar guide part 82 that is connected to the upper part of the support shaft 85 and has a diameter slightly larger than the support shaft 85 are inserted. The support shaft 85 is
It is fixed to a predetermined mount 86.

The support base 81 is provided with a horizontal contact plate 81a which is loosely fitted to the support shaft 85, and a pressing spring 87 is interposed between the contact plate 81a and the mounting plate 86. There is. The pushing spring 87 presses the entire support base 81 upward so that the support base 81 is located above the mounting plate 86. On the inner peripheral surface of the support base 81, a pair of engagement pins that horizontally oppose each other are provided.
88 and 88 are provided, and the tip end of each engagement pin 88 is engaged with the spiral groove 85a formed on the peripheral surface of the support shaft 85. When the support base 81 is moved downward against the pressing force of the pressing spring 87, each spiral groove 85a moves the support base 81 through the engagement pin 88 with which the tip end is engaged. It is formed in a spiral shape so as to rotate about an axis by a predetermined amount.

In the electrode member 80 having such a structure, when the lower end surface of the drum main body 30 is placed on the electrode portion 83 and the flange 40 is inserted into the upper end portion of the drum main body 30 and is pressed, the support base Department
81 is moved downward against the pressing force of the pressing spring 87. At this time, the support base 81 rotates about the axis by the engagement pin 88 moving along the spiral groove 85a of the support shaft 85. As a result, the electrode portion 83 also rotates integrally with the support base portion 81, and the lower end surface of the drum main body 30 placed on the electrode portion 83 is reliably cut by the electrode portion 83.

(Effects of the Invention) In the electrode member for continuity test of the photosensitive drum of the present invention, the drum main body to be subjected to the continuity test is placed on the electrode part and the pressure is applied to insert the flange. Since the non-conductive layer of the main body is removed by the cutting portion of the electrode portion and the electrode portion electrically contacts the conductive tube,
Workability is remarkably improved because the sanding work for removing the non-conductive layer of the drum body is not necessary and the continuity test can be performed simultaneously with the flange insertion work. Since the cutting scraps of the non-conductive layer formed by the electrode portions fall on the electrode member, there is no fear that the photosensitive scrapes on the outer peripheral surface of the drum body are adversely affected by the cutting scraps.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a state of conducting a continuity test using a continuity test electrode member of a photosensitive drum of the present invention, FIG. 2 is a plan view of the electrode member of the present invention, and FIG. 3 is a plan view of the electrode member of the present invention. It is a partially broken side view of the electrode member of another Example. 10,80 ... Electrode member, 11,81 ... Support base part, 12,82 ... Guide part, 13,83 ... Electrode part, 13a ... Support part, 13b ... Cutting part, 20 ...
First electrode member, 30 ... Drum body, 40 ... Flange, 50 ... Conductive member, 60 ... Electrical connection member.

Claims (1)

[Scope of utility model registration request] 1. A flange is attached to one end of a drum main body in which a non-conductive layer is formed on a conductive tube, so that a conductive member attached to the flange and the tube are electrically connected to each other. An electrode member used for testing the continuity between the raw tube and the conductive member in the production of the photoconductor drum, with the end surface of the drum body opposite to the flange mounting side being placed. The photosensitive drum is provided so as to vertically support the drum main body, and has an electrode portion whose upper surface is a sawtooth-shaped cutting portion in a portion corresponding to an abutting portion with the end surface of the drum main body. Electrode member for continuity test.