JPH0782265B2 - Image forming apparatus print cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention enables an image carrier, a primary charger and a cleaner in an image forming apparatus such as an electrophotographic copying machine or a printer to be integrally pulled out from the apparatus main body and inserted. Print cartridge.

[Conventional technology]

The image forming apparatus includes a primary charger around the image carrier,
An image forming unit such as an image exposure unit, a developing machine, a transfer charger, and a cleaner is provided, and the surface of the image carrier is uniformly charged by the primary charger, and then imagewise exposed to form an electrostatic latent image. The electrostatic latent image is developed into a visible image by a developing machine, the visible image is transferred to a sheet by a transfer charger, the sheet is sent to a fixing device to be fixed, and the residual image remains on the image carrier. It is known that the toner is cleaned with a cleaner.

In such an image forming apparatus, the image bearing member and the image forming apparatus have a short service life, and regular inspection and repair,
Since it is necessary to replace it, for example, JP-A-62-6504
As shown in Japanese Patent Publication No. 9 etc., the image carrier and some of the image forming devices are integrated into a print cartridge, and the print cartridge can be detached from the main body of the device, facilitating inspection / repair work and replacement work.

[Problems to be Solved by the Invention]

In the above-mentioned print cartridge, when the image carrier and the primary charger are integrated into a print cartridge, high voltage is applied to the primary charger and the primary charger has a grid. So-called scorotron prevents leakage. Therefore, as a measure to reduce the electric field strength E (KV / cm), it has been common in recent years to electrically connect the shield electrode of the primary charger as a grit so as to have the same potential.
Moreover, after this, since it is usual to apply a bias so that the grid and the shield serving as the shield electrode of the primary charger have the same potential, it is necessary to apply a bias from the device body to the shield and the grid. Since the primary charger and the grid can be attached to and detached from the main body of the apparatus, it is very troublesome and difficult.

Therefore, an object of the present invention is to provide a print cartridge for an image forming apparatus that can solve the above-mentioned problems.

[Means and Actions for Solving the Problems]

(1) The image carrier 2 and the primary charger 3 having the grid 33 are attached to the housing 13 to form the print cartridge A, and the housing 13 can be inserted into and pulled out from the apparatus main body 1 in the axial direction of the image carrier 2. And the grid 33 is formed by forming a number of slit grooves 41 in the thin plate 40,
The primary charger 3 is provided with a connector 51 electrically connected to the corotron wire 48 and a spring shield 53 electrically connected to the shield 45 and the grid 33, and is connected to the connector 51 on the apparatus main body 1 side. A print cartridge for an image forming apparatus, which is provided with an apparatus main body side connector 60 having a terminal 61 and a bias applying terminal 62 in contact with the shield 45.

As a result, the image carrier 2, the primary charger 3, and the grid 33 can be integrally pulled out from the apparatus main body 1 and inserted,
It is easy to inspect, repair, and replace them.

Further, by inserting the print cartridge into the apparatus main body 1, the connector 51 of the primary charger 3 is connected to the apparatus main body side connector.
A high voltage can be applied to the corotron wire 48 by connecting to the terminal 61 of 60, the shield 45 of the primary charger 3 is connected to the bias applying terminal 62, and the shield 45 is a grid.
Since the 33 and the spring shield 53 are electrically connected, the shield 45 and the grid 33 can have the same potential.

(2) The housing 13 is provided with a positioning hole 56 and a grid supporting plate spring 44 at one side in the axial direction of the image carrier, and a positioning pin 57 is provided at the other side, and the grid is provided.
An engaging portion for engaging the leaf spring 44 is provided on one longitudinal side of 33, a mounting piece 43 is provided on the other side, and a positioning pin 49 is provided on one longitudinal direction of the primary charger 3. A mounting piece 50 having a positioning hole 52 is provided on the side, the mounting piece 43 of the grid 33 is brought into contact with the other side surface of the housing 13 in the axial direction of the image carrier, and the engaging portion is engaged with the leaf spring 44 to be attached. , The primary charger 3 is moved in the longitudinal direction to fit the positioning pin 49 into the positioning hole 56, and the positioning hole 52 into the positioning pin 57.
And the mounting piece 50 is brought into contact with the mounting piece 43 of the grid 33 through the spring shield 53, and the mounting piece 50, the spring shield 53, and the mounting piece 43 are attached to the other side surface of the housing 13 with screws 58. A print cartridge for an image forming apparatus.

As a result, the grid 33 can be positioned and mounted on the housing 13 by the mounting piece 43 and the leaf spring 44, the primary charger 3 can be positioned and mounted by the positioning pins 49, 57 and the positioning holes 56, 52, and the grid 33 Since the mounting piece 43, the spring shield 53, and the mounting piece 50 of the primary charger 3 can be mounted with the same screw 58, mounting mounting them on the housing 13,
Easy to remove.

〔Example〕

FIG. 5 is a schematic explanatory view of the image forming apparatus.
Is provided with an image carrier 2, and a primary charger 3, a developing device 4, a pre-transfer charger 5, a transfer charger 6, a separation charger 7, a cleaner 8 and the like are sequentially provided around the image carrier 2. The surface of the image carrier 2 is uniformly charged by the primary charger 3 and then exposed by the image exposure mechanism 9 to form an electrostatic latent image. The electrostatic latent image is visible by the developing device 4. The image is developed, the paper in the paper tray 10 is conveyed toward the image carrier 2 by the paper feeding mechanism 11, the visible image is transferred onto the paper by the transfer charger 6, and the paper is sent to the fixing device 12. It becomes a copy by fixing it.

The image exposure mechanism 9 is a laser system including a laser oscillator, a rotating mirror, and a plurality of mirrors, and is configured to receive image information from an office automation device such as an external computer or a word processor and perform image exposure on an image carrier. is there.

The image carrier 2, the primary charger 3, and the cleaner 8 are attached to a housing 13 to form a print cartridge A, and the housing 13 can be inserted and pulled out along a guide rail 14 provided in the apparatus main body 1. The print cartridge A can be pulled out from the apparatus main body 1 and inserted.

As shown in FIGS. 6 to 9, the housing 13 includes one side plate 20, another side plate 21, and a peripheral wall 22. The peripheral wall 22 has a cleaner housing 23, and the cleaner housing 23 has a cleaning blade 24 and a cleaning blade. Disturber brush 25 in which a brush for planting is planted in an annular shape, and an auger 26 are provided, and one side slide rail 27 is provided, and a cover body 28 is attached across the upper surfaces of the one side plate 20 and the other side plate 21. An opening window 29 is formed in the cover body 28 in the longitudinal direction, the projecting end portion becomes the other side slide rail 30, the one side plate 20 is provided with a positioning side plate 31, and the other side plate 21 is provided with a side plate. 32 is attached, the primary charger 3 is attached on the cover 28, and the cover 28 and the side plate 2 are attached.
0, the grid 33 of the primary charger 3 between the upper surface of the other side plate 21
Is installed.

As a result, the housing 13 is a guide rail in which the one side slide rail 27 and the other side slide rail 30 are provided in the apparatus main body 1.
It is slidable in the axial direction of the image carrier 2 along 14.

Next, the mounting of the primary charger 3 and the grid 33 will be described.

As shown in FIG. 4, the grid 33 is provided with a large number of slit grooves 41 in the middle portion in the longitudinal direction of the thin plate 40, and openings 42, 42 are formed at both ends in the longitudinal direction of the thin plate 40. As a mounting piece 43, as shown in FIG. 1, a thin plate
The both ends in the longitudinal direction of 40 are the tip 20a of the one side plate 20 and the other side plate 21.
The cover body 28 is pressed against the sharp end 21a of the one side plate 20.
The leaf spring 44 provided on the
Are connected to the outer surface of the other side plate 21 by screws described later, and the grid 33 has the other opening 42 on the projecting piece 21b of the other side plate 21.
It is pressed by 4 and positioned in the housing 13.

The primary charger 3 is a metallic shield as shown in FIG.
One side block 46 and the other side block 47 on both sides in the longitudinal direction of 45.
And a corotron wire 48 is stretched between the one-side block 46 and the other-side block 47 and the one-side block 46
A positioning pin 49 is provided on the other side, a mounting piece 50 and a connector 51 are provided on the other side block 47, and a pair of positioning holes 52, 52 are formed on the mounting piece 50, and at the other side in the longitudinal direction of the shield 45. Is attached with a spring shield 53, and the spring shield 53 is composed of a U-shaped fitting piece 54 and a hook-shaped fitting piece 55, and the fitting piece 54 is snap-fitted and fitted to the shield 45. .

Positioning holes 56 are formed in the positioning side plate 31 of the housing 13, and a pair of positioning pins 57, 57 are provided in the other side plate 21. As shown in FIG.
Is moved along the cover body 28 to move the pair of positioning pins 49, 49 provided on the one-side block 46 to the positioning side plate 31.
And the positioning hole 52 formed on the support piece 50 of the other side block 47 is fitted to the positioning pin 57 provided on the other side plate 21 to position the primary charger 3 in the housing 13, and
As shown in Fig. 2 and Fig. 2, screws 58 are inserted through the holes 50a of the mounting piece 50.
The holes 55a of the mounting piece 55 of the spring shield 53, the grid 3
The primary charger 3 is attached to the housing 13 by screwing the other side plate 21 of the housing 13 through the hole 43a of the attachment piece 43 of No. 3.

As a result, the mounting piece 43 of the grid 40 and the mounting piece 55 of the spring shield 53 come into pressure contact with each other, and the fitting piece 54 of the spring shield 53 comes into pressure contact with the shield 45, so that the shield 45 of the primary charger 3 and the grid 33 are electrically connected. Conduct to.

As shown in FIG. 1, an apparatus main body side connector 60 is attached to the apparatus main body 1 so as to face the connector 51, and a biasing force consisting of a terminal 61 for energizing a corotron wire and a spring is applied to the apparatus main body side connector 60. When the housing 13 is moved in the direction of the arrow, the connector 51 of the primary charger 3 is fitted to the terminal 61 of the device body side connector 60 and the corotron wire 48 is attached to the device body as shown in FIG. A high voltage is applied from the first side, and the shield 45 contacts the bias applying terminal 62 so that the shield 45 and the grid 33 have the same potential.

〔The invention's effect〕

(1) Since the image carrier 2, the primary charger 3, and the grid 33 can be integrally pulled out from the apparatus main body 1 and inserted, it is easy to inspect, repair, and replace them.

Further, by inserting the print cartridge into the apparatus main body 1, the connector 51 of the primary charger 3 is connected to the apparatus main body side connector.
A high voltage can be applied to the corotron wire 48 by connecting to the terminal 61 of 60, the shield 45 of the primary charger 3 contacts the bias applying terminal 62, and the shield 45 is a grid.
Since the 33 and the spring shield 53 are electrically connected, the shield 45 and the grid 33 can have the same potential.

(2) The grid 33 is made up of the mounting piece 43 and the leaf spring 44, and the housing 13
The primary charger 3 can be positioned and mounted by the positioning pins 49, 57 and the positioning holes 56, 52, and the mounting piece 43 of the grid 33 and the spring shield 53 can be mounted.
Since the mounting piece 50 of the primary charger 3 can be mounted with the same screw 58, it is easy to mount and dismount them from the housing 13.

[Brief description of drawings]

1 shows a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing a mounting state of a primary charger and a grid, FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. 4 is an exploded perspective view. FIG. 5 is a schematic explanatory view of the image forming apparatus, FIG. 6 is a plan view of the print cartridge, FIG. 7 is a left side view, FIG. 8 is a right side view, and FIG. 9 is a central longitudinal sectional view. 1 is an apparatus main body, 2 is an image carrier, 3 is a primary charger, 13 is a housing, 33 is a grid, 40 is a thin plate, 41 is a slit groove,
43 is a mounting piece, 44 is a leaf spring, 45 is a shield, 48 is a corotron wire, 49 is a positioning pin, 50 is a mounting piece, 51 is a connector, 52 is a positioning hole, 53 is a spring shield, 56 is a positioning hole, 57 Is a positioning pin, 58 is a screw, 60 is a device side connector, 61 is a terminal, and 62 is a bias applying terminal.

Claims (2)

[Claims] 1. A housing 13 having an image carrier 2 and a grid 33.
A primary charging device 3 having the above is attached to form a print cartridge A, the housing 13 is attached to the apparatus main body 1 so that the housing 13 can be inserted and pulled out in the axial direction of the image carrier 2, and the grid 33 is attached to the thin plate 40 with a large number of slit grooves. 41 is formed, and the primary charger 3 is provided with a corotron wire.
A connector 51 electrically connected to 48 and a spring shield 53 electrically connected to the shield 45 and the grid 33 are provided, and a terminal 61 connected to the connector 51 and a bias contacting the shield 45 are provided on the apparatus body 1 side. Applying terminal 62
A print cartridge for an image forming apparatus, which is provided with an apparatus main body side connector 60 including the above. 2. A positioning hole 56 and a grid supporting leaf spring 44 on one side of the housing 13 in the axial direction of the image carrier.
And a positioning pin 57 on the other side, an engaging portion for engaging the leaf spring 44 on one side in the longitudinal direction of the grid 33, and a mounting piece 43 on the other side, the primary charging Bowl 3
The positioning pin 49 is provided on one side in the longitudinal direction of the, and a mounting piece 50 having a positioning hole 52 is provided on the other side, and the mounting piece 43 of the grid 33 is brought into contact with the other side surface of the housing 13 in the axial direction of the image carrier. In addition, the engaging portion is attached to the leaf spring 44 by being attached, the primary charger 3 is moved in the longitudinal direction, and the positioning pin 49 is fitted into the positioning hole 56.
52 is fitted to the positioning pin 57 and the mounting piece 50 is brought into contact with the mounting piece 43 of the grid 33 via the spring shield 53,
Screw the mounting piece 50, spring shield 53, and mounting piece 43.
The print cartridge of the image forming apparatus according to claim 1, wherein the print cartridge is attached to the other side surface of the housing 13 by 58.