JPH057247Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a jig for anodizing photosensitive drums, that is, anodizing as a base treatment for OPC photosensitive drums used in PPC copiers, laser beam printers, etc. The present invention relates to a jig for attaching the drum to an electrolytic frame during processing.

Prior art and its problems This type of photosensitive drum is made up of an aluminum alloy drum with a CGL (charge generation layer) and CTL (charge transfer layer) formed on the surface.
In order to improve the coatability of CGL or to prevent the generated charge from leaking in the direction of the drum, the drum is sometimes subjected to anodizing treatment as a base treatment.

By the way, this type of photosensitive drum has several uses,
Since strict quality is required, during the above treatment, care must be taken not to deform the drum, not to damage the surface of the drum, and not to stain the surface of the drum. It is required to secure the contact area and attach it to the electrolytic frame.

However, it has been extremely difficult to satisfy all of these requirements and to attach it to the electrolytic frame with good workability.

This invention was made to solve the above-mentioned problems, and when anodizing a photosensitive drum, it can be attached to an electrolytic frame without deforming the drum or damaging or staining the drum surface. It is an object of the present invention to provide a jig which can be used in a conventional manner, has good workability, and is capable of ensuring a sufficient electrode contact area for energization.

Means for Solving the Problems Namely, this invention consists of a strut, which extends radially from the distal end of the strut, and is folded back toward the proximal end of the strut in a flexible and outwardly bulging shape. an expansion holding part that is expanded within the photosensitive drum by its elastic restoring force and held in contact with the inner circumferential surface of the drum in a pressed state; The jig is made of an electrically conductive material and includes a mounting support section that supports the lower edge of the drum, the mounting support section being coated with a cushioning material, and a mounting support section that supports the lower edge of the drum. One or more contact portions with the inner circumferential surface of the drum constitute energizing contacts, and the contact portions have a shape that follows the inner circumferential surface of the drum.
The gist of this article is a jig for anodizing a photosensitive drum.

By drawing the placement support toward the support column, the maximum radius of the expansion holding section connected to the support is reduced. Therefore, by inserting the expanded holding part in the contracted state into the drum and then releasing the pulling of the support part, the holding part will be expanded in the drum by its elastic restoring force,
The contact portion is held in contact with the inner circumferential surface of the drum at a plurality of locations in a pressed state. Further, the lower end edge of the drum is engaged with a mounting support portion extending outwardly from the lower end portion of the holder, thereby being mounted and supported. The cushioning material covering the support portion allows the photosensitive drum to be supported without damaging its lower edge.

One or more contact portions of the expansion holding portion with the inner circumferential surface of the drum constitute contacts for supplying current from the jig to the drum.

Embodiments Hereinafter, this invention will be explained based on illustrated embodiments.

As shown in FIG. 1, the jig A for anodizing the photosensitive drum according to this embodiment is constructed by bending three wire-like spring members and combining them. It is conductive in itself. As the conductive material constituting this jig A, for example, Al, Ti, Zr, or an alloy thereof is suitably used.

In FIG. 1, reference numeral 1 denotes a support column, which is made by bundling and joining the straight rod-shaped portions of each of the above-mentioned spring members.

Reference numeral 2 denotes an expansion holding part, which extends radially from the tip of the pillar 1 and is bent back toward the proximal end 1a of the pillar 1 in a flexible and outwardly bulging shape. be. The maximum radius of these holding parts 2 is set to be slightly larger than the inner diameter of the photosensitive drum B. As shown in FIGS. 2 and 3, the expansion holding portion 2 is expanded within the photosensitive drum B by its elastic restoring force, and the expansion holding portion 2 is expanded within the photosensitive drum B.
It is designed to be held in contact with the inner circumferential surface of the cylinder in a pressed state at three locations. The contact portion 2a of the holding portion 2 with the inner circumferential surface of the drum constitutes a current-carrying contact, and has a conductive electrode piece 3 attached thereto having a shape that follows the inner circumferential surface of the drum. being done.

Note that this electrode piece 3 is not necessarily necessary since the holding part 2 itself is made of a conductive material, but if such an electrode piece 2 is not attached, the energizing contact is connected to the drum B. It is necessary to have a shape that follows the inner circumferential surface of.

Reference numeral 4 denotes a mounting support part, which extends outwardly from the lower end of the holding part 2 in a bent shape, and is adapted to support the lower edge b of the drum B on its upper part.

The mounting support section 4 is covered with a cushioning material 5 made of soft rubber, soft synthetic resin, or the like so as not to damage the lower edge b of the photosensitive drum B that comes into contact with it.

A downwardly hanging grip portion 6 extends from the lower end of the support portion 4 .

Therefore, the jig A has a base end 1 of the support 1.
a is fixed to the conductive bus bar C by a mounting bracket 7. Note that this bus bar C is also made of Al, Ti,
Zr or an alloy thereof is preferably used.

In order to make the jig A hold the photosensitive drum B, each of the gripping parts 6 is grasped by hand and pulled toward the support column 1 side. Then, the expansion holding part 2 is bent accordingly and its maximum radius is reduced, and the photosensitive drum B is fitted onto it while maintaining this reduced state. Then, when the lower edge b of the drum B comes into contact with the cushioning material 5 of the mounting support section 4, the process is completed by gently releasing the pulling of the gripping section 6.

In this state, the expansion holding portion 2 is expanded within the drum B due to its elastic restoring force,
The contact portion 2a, that is, the electrode piece 3 spans the inner peripheral surface of the drum B at three locations, and the contact portion 2a, that is, the electrode piece 3 is held in contact with the pressed state, and the lower edge b of the drum B It is supported by the mounting support part 4. The contact portion 2a of the expansion holding portion 2 with the inner circumferential surface of the drum, that is, the electrode piece 3 constitutes an energizing contact.

Thus, the photosensitive drum B held in this manner
together with the conductive bus bar C and jig A are immersed in a treatment bath and subjected to anodic oxidation treatment as a base treatment.

Effects of the Invention As described above, the jig for anodizing a photosensitive drum according to this invention includes an expanding holding part that holds the photosensitive drum in contact with its inner peripheral surface in a pressed state, and a lower edge of the drum. The drum is held by a mounting support that supports the drum, and a cushioning material is provided on the surface of the mounting support. The contact portion has a shape that follows the inner peripheral surface of the drum. Therefore, it is possible to avoid the inconvenience of deforming the photosensitive drum or damaging or staining its surface when holding the photosensitive drum, and it is possible to stably support and hold the photosensitive drum. In addition, since the contact part constituting the current contact has the above-mentioned shape, it is possible to prevent so-called burning during anodizing treatment, and to make the thickness of the oxide film uniform over the entire outer peripheral surface of the drum. This makes it possible to perform a good anodic oxidation treatment on the surface.

Further, since one or more contact portions of the expansion holding portion with the inner circumferential surface of the drum constitute electrical contacts, and the contacts have the above-described shape, the elastic restoring force of the expansion holding portion In combination with the expanding action of the above, it is possible to secure sufficient current-carrying contacts.

Furthermore, the expansion holding portion extends radially from the tip of the support and is bent back toward the proximal end of the support in a flexible and outwardly bulging shape. , and the mounting support extends from the lower end in the shape of a bent outer piece, so by pulling the mounting support toward the column, the expansion holding section can be moved into the photosensitive drum. Its maximum radius can be reduced to the extent that it can be inserted into the Therefore, the attachment of the photosensitive drum to the electrolytic frame can be completed by a simple operation of inserting the holding part into the drum in its reduced state and then releasing the pulling of the support part, improving work efficiency. sell.

[Brief explanation of the drawing]

The drawings show an example of this invention.
FIG. 1 is an overall perspective view, FIG. 2 is a plan view showing a state in which the photosensitive drum is held, and FIG. 3 is a sectional view taken along the line shown in FIG. 2. DESCRIPTION OF SYMBOLS 1... Support column, 2... Expansion holding part, 2a... Contact part, 4... Placement support part, 5... Cushioning material, A... Jig, B... Photosensitive drum, b... Lower edge .

Claims (1)

[Claims for Utility Model Registration] A strut 1, which extends radially from its tip and is folded back toward the proximal end 1a of the strut 1 in a flexible and outwardly bulging shape. It is expanded in the photosensitive drum B due to the elastic restoring force, and the drum B
an expanded holding part 2 which is held in contact with the inner circumferential surface of the drum B in a pressed state; A jig A made of a conductive material and having a support part 4, wherein the mounting support part 4 is covered with a cushioning material 5, and the inner peripheral surface of the drum in the expansion holding part 2 and One or more of the contact portions 2a constitute energizing contacts, and the contact portion 2a has a shape that follows the inner circumferential surface of the drum. jig.