JPS62187376A - Recorder - Google Patents

Abstract

PURPOSE:To mount and demount a photosensitive drum only by manual operation by providing a shaft member which is attachable to and detachable from a machine frame to one side of an image forming drum and providing a detachable support member which supports the drum. CONSTITUTION:While the photosensitive drum 10 is put in a case 20 and supported by fitting a bearing member 40, an integrated support shaft 10a is supported pivotally in the shaft hole 20b-1 of a side wall on one flange surface of the drum 10, and the other flange surface is fitted to the support shaft 43 of the member 40 and can be rotated by a gear G. When the drum 10 is demounted, the member 40 is rotated as shown by an arrow C and disengaged from a lock part 42, and then detached and removed from the side wall 20a, and when the whole drum 10 is moved toward the side wall 20a, the support shaft 10a is disengaged from the shaft hole 20b-1 of the side wall 20b and taken out of the opening part of the case 20. This operation and opposite operation are performed to fit the drum 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support mechanism for an image forming drum, and more particularly to a recording device configured to be quickly and easily attached and detached without damaging the photoreceptor surface.

[Conventional technology]

A copying device, which is generally used as a recording device, has a built-in photoconductor drum whose cylindrical surface is used as a photoconductor as an image carrier, and is rotated by the power of the main body of the device to process images arranged around it. Through the functional process, a toner image for transfer is formed, which is then transferred to recording paper to make a copy.

As described above, the photoreceptor drum is located at the center of the image processing section and is rotatably supported, but since there is a chance that it will be removed during periodic cleaning or replacement of the photoreceptor as mentioned above, It is incorporated with a detachable mechanism.

However, with recently commercially available copying machines, it is extremely difficult to attach and detach the photoreceptor drum, and there is a risk of damaging the surface of the new photoreceptor drum by contacting the aforementioned image processing member, etc., which can greatly impair the quality of the copied image. It also began to accompany me.

In order to solve these problems, several improvement proposals have been proposed regarding the support mechanism of the photosensitive drum, including the proposal in Japanese Patent Publication No. 142382/1982. or,
In recent years, it has become popular as an inexpensive photoconductor with a short lifespan.When using an OPC photoconductor, it can last for tens of thousands of sheets rather than a few dozen sheets, but cannot be used for more than that. Therefore, it is necessary to frequently replace the photosensitive drum.

[Problem that the invention seeks to solve]

However, in the above proposal, the bearing is supported by a relatively long shaft member that inserts the photoreceptor drum into the flanges at both ends, and furthermore, the photoreceptor drum is prevented from falling when the shaft member is removed. Since the receiver is provided with a member, the photoreceptor drum itself must be assembled into the main body of the device via a slidable frame member.
As a result, the support mechanism becomes complicated and large-scale, which may be a big disadvantage in terms of manufacturing and handling, especially in terms of volume and economy, especially for small-sized copying machines.

The present invention solves this problem and improves it, and by attaching and detaching only one member, the photoreceptor drum can be attached and detached safely, reliably, and quickly by hand without the need for any special tools. The object of the present invention is to provide a copying apparatus which is designed to be similar to the above, and which also has a good appearance.

[Means for solving problems]

In a recording device having an image forming drum, one of the drums has a shaft member that can be attached to and detached from the machine frame, and the other drum has a drum support shaft, and a part of the machine frame has a shaft member that is detachable from the machine frame. This is achieved by a recording device characterized by having a removable support member that supports the drum by fitting and mounting it.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1-3.

The figure shows the arrangement of various equipment in a copying machine which is generally used as a recording device in the present invention. It is composed of process equipment such as a cleaning device 21, a charge erasing lamp n, a charging electrode B, a magnification erasing lamp 2/I, and a developing device blade.

The photosensitive drum 10 is a rotating body whose outer periphery is a photosensitive surface and is driven and rotated clockwise by the power source of the copying machine, and the cleaning device 21 is in sliding contact with the circumferential surface of the photosensitive drum 100. This device cleans the toner remaining on the circumferential surface of the photoreceptor drum 10, which is composed of the blade member 21a, the toner guide roller 21b, and the toner conveyance device 2 for recovering the removed toner]e.

The charge erasing lamp n is a rod-shaped lamp that is turned on to erase the residual charge on the photoreceptor after cleaning, and the charging electrode applies a uniform charge to the photoreceptor in order to form a new electrostatic latent image. The electrode for applying the voltage, and the lamp 24 for magnification changing/both ends and leading and trailing ends have a built-in light emitter for erasing the charge in the non-image area and non-transfer area of the photoreceptor that is caused by variable magnification copying and recording paper size. It is a piece of equipment.

On the other hand, the developing device (9) includes a developing sleeve 31 that conveys toner to the photoreceptor by its magnetism in order to perform development, a toner cartridge 32 containing toner to be replenished to the developing sleeve 31, and a toner cartridge 32 to be replenished to the developing sleeve 31. This device incorporates various developing members such as an agitation rotor 33 for mixing the toner with the carrier.

The operation of image formation by each of these process equipment is performed as follows. That is, as the photoreceptor drum IO rotates clockwise and the residual toner image on the peripheral surface after transfer is peeled off and cleaned by the sliding action of the blade member 21a of the cleaning device 21, the charge eraser is removed. Lamp n is turned on to remove locally residual charges on the circumferential surface.

Next, after a uniform charge is applied to the circumferential surface of the photosensitive drum 10 by the charging electrode, the variable magnification erase/both ends leading edge erase lamp 24 is turned on if the variable magnification copying mode is selected. This is to erase charges in non-image areas that occur as a result of zooming.

In the subsequent rotation period, a slit-shaped image of the original is projected by the lens 3 by the moving scanning of the first and second mirror units 1 and 2 of the optical system onto the charged image area around the photosensitive drum 10. The image is exposed and formed through the third mirror unit 4, and as it rotates, an electrostatic latent image is formed on the entire image surface of the original document.

The electrostatic latent image thus formed is then supplied with toner by the developing sleeve 31 of the developing device I to form a toner image, which is carried out from the paper feed cassette at the position of the transfer electrode 6 and passed through the paper feed roller 5. The above-mentioned toner image is transferred overlappingly with the recording paper P that is conveyed in synchronization to complete one cycle of image formation.The recording paper P with the toner image thus transferred is transferred to the following separation electrode 7 At this point, the sheet is separated from the circumferential surface of the photosensitive drum 100 and conveyed to the fixing device 8, and after the toner is melted and fixed, it is discharged to a sheet discharge tray 9 provided outside the device, completing one cycle of copying.

As a means for attaching each of the process equipment for image formation to the main body of the copying apparatus, the present invention eliminates the method of attaching each of the process equipment individually to the main body of the copying apparatus, and instead incorporates each process equipment other than the developing device 30 into a single unit for copying. After being installed and housed in the case 20 of the unit device, the case 20 and the developing device 30 are each loaded in a cartridge manner into the main body of the copying machine, thereby automatically setting each of the process equipment described above to the main body of the copying machine. It is configured so that it will be carried out.

Further, in the present invention, the photoreceptor drum 10 is further mounted and supported on the case 220 by a second. As shown in FIG. 3, attachment and detachment are performed by a support mechanism that is free, easy and safe.

That is, FIG. 2 shows the case 20 with the drawer removed from the copying machine and laid down upside down.
One side wall 20a of the case 20 has a
As shown in FIG. 2, a bearing member 40, which will be described later, is attached from the outside of the side surface 20a and constitutes one bearing of the photoreceptor drum 10.
The shaft hole 20 & -1 into which the body portion 41 of the body 41 fits, the arc-shaped elongated hole 20 a -3 into which the lock portion 42 of the bearing member 40 can be inserted and engaged, and the shaft hole 20
U with an inner width slightly larger than the diameter of a-1
A letter-shaped protrusion 20a-2 is provided.

In addition, the other side wall 20b of the case part is shown in FIG.
As shown in b), the outer diameter of the shaft 20 b -1 that fits into the support shaft 10 a that is integral with the flange surface of the photoreceptor drum 10 and the shaft seat portion 10 b of the support shaft 10 a is slightly smaller than the outside diameter of the shaft 10 b. A U-shaped protrusion 20b-2 having a large inner width is provided on the holder.

Furthermore, the above-mentioned bearing member 40 is prepared separately from the case head, and the L-shaped side surface shape is formed along with the operation of fitting the body part 41, which is the mounting part, into the shaft hole 20a-1. The locking portion 42 with the elongated hole 20a-3
When inserted into the side wall 20a and rotated in the direction of arrow C, the side wall 20a
It is configured so that it can be engaged and fixed.

Therefore, when the photoreceptor drum 10 is housed in the case 20 and supported by the bearing member 40, one flange surface of the photoreceptor drum 10 is rotated so that the integrated support shaft 10a is aligned with the axis of the side wall 20b. The hole 20b is fitted into the supporting shaft 43 at the tip of the bearing member 40 and is in a state of being supported by the bearing, and is placed in a state of being rotated by the power transmitted to the gear G. The gear G may be integrally formed on the support shaft 10a or may be fixed by locking or the like.

Further, in this state, one flange surface of the photosensitive drum 10 is in contact with the shaft seat portion tab and the side 120b, and the other flange surface is in contact with the boss portion tOC and the bearing member 41.
The contact with the end face of the body portion 41 restricts the movement of each member more than necessary, thereby preventing displacement (rotation) in the thrust direction.

On the other hand, when removing the photoreceptor drum 10, first rotate the bearing member 40 in the relative direction of the arrow C and lock the locking portion 40.
When the photoreceptor drum 10 is disengaged and removed from the side wall 20a, the flange surface of the photoreceptor drum 10 falls slightly, but the outer periphery of the boss portion 10e immediately rises to the protrusion 20 formed on the inside of the side wall 20a. The receiver is stopped at a-2, and the photoreceptor on its circumferential surface is visited from the can 4 of another image forming member J-.From this state, the photoreceptor drum 10 When the entire body is moved in the direction of the side JJ 20a, the fitting between the support @ 10a on the other flange surface and the shaft hole 20b-1 of the side wall 20b is disengaged, and the shaft seat portion 10b is moved inside the side wall 20b. The support is held by the protrusion 20b-2 formed in the photoreceptor drum 1o, so that the photosensitive drum 1o is supported horizontally together with the protrusion 20a-2.

Therefore, the photosensitive drum 10 is not damaged in any way and can be easily and safely taken out from the opening opened above or to the side of the case.

Note that the attachment of the photoreceptor drum 10 is accomplished by the reverse operation of the above-mentioned removal operation, but even in that case, the protrusions 20a-2, 20b-2 do not receive the photoreceptor drum 1o. The photosensitive drum 10, which is supported by the protrusions 20a-2 and 20b-2, can be easily turned into the bearing state shown in the figure by lifting it slightly. It is possible to do so.

〔Effect of the invention〕

As described above, in the present invention, a shaft formed integrally with the image forming drum is fitted into the unit, and the other is supported by a bearing member that can be removed by turning half a turn or less, so that the drum is attached to the drum. The drum can be attached to the unit by moving it slightly in the thrust direction, and the bearing member allows for easy and quick attachment, and the drum is supported stably.
Also, the protrusions are formed inside the side wall and are located at positions that are not affected by the photosensitive surface of the drum during attachment and detachment.

Therefore, the drum will not fall downward even if it falls unexpectedly or if there is a malfunction during installation, so it is safe and has great operational effects during manufacturing and repair/replacement (as a result, inexpensive and accurate maintenance is possible. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram of a copying apparatus according to the present invention. FIG. 2 is a perspective view of the image forming unit of the apparatus. Figure 3 is a side view of the main part. lO... Photosensitive drum lQa, 43... Support shaft addition... Case 20a, 20b... Side wall 20m -1, 20b -1... Shaft hole 20a-2, 2
0b 2 ・"Protrusion 20a-3...Long
40... Bearing member 41... Trunk 4
2...Lock Department Applicant Konishiroku Photo Industry Co., Ltd. 0b 0b-j

Claims (3)

[Claims] (1) In a recording device having an image forming drum, one of the drums has a shaft member that can be attached to and detached from the machine frame, and the other drum has a drum support shaft, and A recording device comprising a removable support member that supports the drum by fitting and mounting a part of the drum. (2) The recording apparatus according to claim 1, wherein the image forming drum is supported in a detachable manner with respect to a unit device. (3) The recording apparatus according to claim 1, wherein the unit device to which the image forming drum is mounted has a fall prevention member that prevents the drum from falling when the drum is attached or detached.