JP2890299B2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electrophotographic copying machine and a printer.

[0002]

2. Description of the Related Art As an image forming apparatus, an image forming apparatus such as a primary charger, an image exposing unit, a developing device, a transfer charger, and a cleaner is arranged around an image carrier, and the image carrier is carried by the primary charger. After uniformly charging the surface of the body, image exposure is performed to form an electrostatic latent image, and the electrostatic latent image is developed into a visible image by a developing machine, and the visible image is transferred to paper by a transfer charger. There is known an image forming apparatus in which a sheet is transferred and fed to a fixing device to fix the sheet, and the residual toner on the image carrier is cleaned by a cleaner.

[0003]

If the charging device in the above-described image forming apparatus, for example, a so-called scorotron type charging device in which the primary charger has a grid, the electric field strength between the grid and the shield is increased. (KV / cm) was high and a leak occurred.

Accordingly, an object of the present invention is to provide an image forming apparatus capable of solving the above-mentioned problems.

[0005]

In an image forming apparatus having an image carrier and a charging device for charging the surface of the image carrier, the charging device covers a corotron wire and a periphery of the corotron wire. A shield 45 provided with a mounting piece 50 near one end in the longitudinal direction, and a fitting piece 54 fitted near one end in the longitudinal direction of the shield 45;
A spring shield 53 consisting of a mounting piece 55 that comes into contact with the mounting piece 50 continuously with the fitting piece 54, and a mounting piece 43 provided between the corotron wire 48 and the image carrier and in contact with the mounting piece 55. A mounting piece 5 provided on the shield 45 and having a grid 33 to which bias is applied.
0, mounting piece 55 of spring shield 53 and grid 3
3. An image forming apparatus, wherein a screw 58 penetrating through the mounting piece 43 is screwed and mounted on the apparatus main body side.

[0006]

According to the image forming apparatus of the present invention, since the shield 45 of the charging device and the grid 33 are electrically connected to each other and have the same potential, a leak occurs between the shield 45 and the grid 33. Nothing. The shield 45 and the grid 33 can be mounted by fitting the fitting piece 54 of the spring shield 53 to the shield 45 and screwing a screw 58 penetrating through each of the mounting pieces 50, 55, 33 to the apparatus body side. The shield 45 and the grid 33 can be electrically connected by the spring shield 53.

[0007]

FIG. 5 is a schematic explanatory view of an image forming apparatus, in which an image carrier 2 is provided on an apparatus main body 1, 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 arranged. The primary charger 3 uniformly charges the surface of the image carrier 2, and then the image exposure mechanism 9 Exposure to form an electrostatic latent image, the electrostatic latent image is developed into a visible image by the developing device 4, and the paper in the paper tray 10 is fed to a paper feed mechanism 11.
Then, the visible image is transferred to a sheet by the transfer charger 6, and the sheet is sent to the fixing unit 12 to be fixed to form a copy.

The image exposure mechanism 9 is of a laser type comprising a laser oscillator, a rotating mirror, and a plurality of mirrors. The image exposure mechanism 9 receives image information from an office automation device such as an external computer or a word processor and performs image exposure on an image carrier. It is composed.

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

As shown in FIGS. 6 to 9, the housing 13 has one side plate 20, another side plate 21 and a peripheral wall 22, and the peripheral wall 22 has a cleaner housing 23.
4. A disturber brush 25 and an auger 26 in which a cleaning brush is planted in an annular shape are provided.
A cover 28 is attached to the upper surface of the one side plate 20 and the other side plate 21, and an opening window 29 is formed in the cover 28 in the longitudinal direction, and a protruding end is provided. The other side slide rail 30 is provided, a positioning side plate 31 is provided on the one side plate 20, a side plate 32 is mounted on the other side plate 21, and the primary charger 3 is mounted on the cover 28. A grid 33 of the primary charger 3 is mounted between the upper surface of the first side plate 20 and the other side plate 21.

Thus, the housing 13 is slidable in the axial direction of the image carrier 2 along the guide rail 14 provided on the apparatus main body 1 with the one slide rail 27 and the other slide rail 30.

Next, attachment 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 at an intermediate portion in the longitudinal direction of the thin plate 40,
Openings 42, 42 are formed at both ends in the longitudinal direction of the thin plate 40, and one end is bent to form a mounting piece 43. As shown in FIG. The cover body 28 is pressed against the tip 20a of the other side plate 21 by the cover body 28, the leaf spring 44 provided on the one side plate 20 is engaged with the one opening 42, and the mounting piece 43 is attached to the outer surface of the other side plate 21 as described later. Grid 3 connected with screws
In 3, the other opening 42 is pressed against the protruding piece 21 b of the other side plate 21 by the leaf spring 44 and positioned in the housing 13.

As shown in FIG. 1, the primary charger 3 is provided with one side block 46 and another side block 47 on both sides in the longitudinal direction of a metal shield 45, and the first side block 46 and the other side block 47 are connected to each other. A corotron wire 48 is stretched, and a positioning pin 49 is provided on one side block 46.
A mounting piece 50 and a connector 51 are provided on the other side block 47. A pair of positioning holes 52, 52 are formed in the mounting piece 50, and a spring shield 53 is mounted on the other side in the longitudinal direction of the shield 45. The spring shield 53 has a U-shaped fitting piece 54 and a hook-shaped mounting piece 5.
5, the fitting piece 54 is fitted to the shield 45 by snap fitting.

A positioning hole 56 is 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.
By moving the primary charger 3 along the cover body 28 as described above, the pair of positioning pins 49, 49 provided on the one side block 46 are fitted to the positioning side plate 31, and the other side block 47 is supported. The primary charging device 3 is positioned in the housing 13 by fitting the positioning holes 52 formed in the piece 50 with the positioning pins 57 provided in the other side plate 21, and as shown in FIGS. The primary charger 3 is attached to the housing 13 by screwing a screw 58 to the other side plate 21 of the housing 13 from the hole 55a of the attachment piece 55 of the spring shield 53 and the hole 43a of the attachment piece 43 of the grid 33 from the hole 50a.

As a result, the mounting piece 43 of the grid 33 and the mounting piece 55 of the spring shield 53 are pressed against each other, and the fitting piece 54 of the spring shield 53 is pressed against the shield 45, so that the shield 45 of the primary charger 3 and the grid 33 are pressed. Are electrically conductive.

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. The apparatus main body side connector 60 comprises a terminal 61 for energizing a corotron wire and a spring. 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 apparatus body side connector 60 and the apparatus is connected to the corotron wire 48 as shown in FIG. A high voltage is applied from the main body 1 side, and the shield 45 contacts the bias application terminal 62 so that the shield 45 and the grid 33 have the same potential.

[0018]

According to the image forming apparatus of the present invention, since the shield 45 of the charging device and the grid 33 are electrically connected and have the same potential, a leak occurs between the shield 45 and the grid 33. Never do. The shield 45 and the grid 33 can be mounted by fitting the fitting piece 54 of the spring shield 53 to the shield 45 and screwing a screw 58 penetrating through each of the mounting pieces 50, 55, 33 to the apparatus body side. The shield 45 and the grid 33 can be electrically connected by the spring shield 53.

[Brief description of the drawings]

FIG. 1 is a vertical cross-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.

FIG. 4 is an exploded perspective view.

FIG. 5 is a schematic explanatory diagram of an 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.

FIG. 9 is a central longitudinal sectional view.

[Explanation of symbols]

2 image carrier, 3 primary charger, 33 grid, 45
... shield, 53 ... spring shield.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03G 15/02 101

Claims (1)

(57) [Claims] 1. An image forming apparatus having an image carrier and a charging device for charging the surface of the image carrier, the charging device comprises a corotron wire (48),
To cover the periphery of the rotron wire (48)
A shield (4) provided with a mounting piece (50) near one end.
5) and fitted near one end in the longitudinal direction of the shield (45).
A mating piece (54), which is continuous with the mating piece (54);
A switch comprising a mounting piece (55) in contact with the mounting piece (50).
A pulling shield (53) and the corotron wire
(48) and the mounting piece (5) provided between the image carrier.
5) has a mounting piece (43) in contact with it and is biased
It has a grid (33), and a mounting piece (50) provided on the shield (45).
(55) and the grid (3)
Screw (58) penetrating the mounting piece (43) of 3)
An image forming apparatus characterized by being screwed to a body side for mounting.
Place.