JPS61117579A - Cleaning device of corona discharger - Google Patents

Abstract

PURPOSE:To realize a stable uniform discharge with a corona discharger, by constituting the discharger in such a way that dust and discharge produced matters adhering to the corona discharge electrode can be removed by means of a cleaning member by moving a mover. CONSTITUTION:When a motor 24 is actuated, a driving pulley 15 is moved a driving wire 17 is moved. When the wire 17 is moved, the mover 10 moves in a duct 8 and, at the same time, cleaning pads 6 and 7 fitted to the leg section 11 of the mover 10 also move while they respectively interpose a discharge wire 1 and grid wire 5. Therefore, adhering matters, such as toner, etc., and matters produced by corona discharge adhering to the wires 1 and 5 are removed by the pads 6 and 7. These wires 1 and 5 are used when the surface of a photosensitive body A is electrified or the electricity on the surface is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a cleaning device for a corona discharge device (corotron) used in an electrophotographic copying machine, etc., and more particularly, to a cleaning device for a corona discharge device (corotron) used in an electrophotographic copying machine, etc. The present invention relates to a cleaning device for a corona discharger, which includes a shield that partially surrounds the electrode, and an ozone suction duct that is installed within the shield and discharges ozone emitted from the electrode to the outside.

[Prior Art] In a general electrophotographic copying machine, as shown in FIG. 8, a charger (
b), an electrostatic latent image is formed on the surface using an optical system (C), and this latent image is transferred to a sheet (0) using a developing device (d) and a toner transfer charger (T). At the same time, this paper (a) is transferred to a paper peeling charger (h).
□ Peel it off from the photoreceptor (a) marked in -F, and remove it from the fixing device (
By i), the above-mentioned toners are fixed and the copy is removed.

On the other hand, after the paper (0) has been peeled off, the photoreceptor (a) is charged with a charger (j) for removing static electricity, if necessary, and the toners 1 to 1 remaining on its surface are removed by a cleaning device (k).
) for reuse. In this case, the chargers (b), (f), (hL
, (j) a corona discharger is used. As shown in Fig. 9, the basic structure of this corona discharge device is a corona discharge wire (1) stretched between end blocks (2) and (3) at both ends, and a corona discharge wire (1). For charging = 10 trons, a scorotron with a grid (5) for uniform charging may be used, as shown in FIG. 10.

By the way, the drawback of the above-mentioned corotron is that the toner of the copying machine and gas products accompanying the discharge adhere to the discharge wire A7-(1), the shield (4), or the grid (5), impairing the discharge function. . The main cause is the high voltage electrostatic precipitator effect, which is an unavoidable problem when using a corotron. In order to avoid this problem, the following methods have been proposed as means for cleaning substances adhering to the discharge wire (1), shield (4), and grid (5). A typical method is to scrape off the deposits with a pad made of nonwoven fabric, metal i1M mat, or the like. In this method, there are methods such as using a motor as a driving source to keep the pad stationary, or moving it manually by the user, or linking it to the opening and closing of the copying machine door (see Japanese Patent Publication No. 8102/1983). ). When cleaning automatically, set the number of copies per copy to 1-1. A method has been proposed (see Japanese Patent Application Laid-Open No. 54-28633) in which the sensor is moved after detecting that a certain period of time has elapsed.

[Problems to be Solved by the Invention] However, when trying to put the above-mentioned technical ideas into practical use, the following points become obstacles. That is, 1) the connection between the drive mechanism of the copying machine and the cleaner becomes complicated, which not only increases costs but also increases the size of the apparatus; 2) maintenance and inspection work takes time and increases costs. Furthermore, 3) copies cannot be made while cleaning is being performed, resulting in a decline in copying work. Furthermore, 4) dirt accumulates on the cleaner pad, causing secondary contamination.

[Step I to solve the problem] □These four methods were developed in view of the above circumstances. When entering a corona discharger having an ozone absorption duct installed in the shield to allow ozone emitted from the electrodes to enter and exit from the outside, a driving magic trick can be moved into the ozone absorption duct. A movable potato is fixed to the driving means of the movable body, and the movable potato is connected to the movable body through a leg portion which is loosely fitted and passes through the sulin 1 bored in the ozone suction duct 1. An object of the present invention is to provide a cleaning device for a corona discharger, which is characterized by being equipped with a cleaning member for cleaning the corona discharger.

[Effect] The above technical means works as follows.

As the driving means moves, the moving element moves within the ozone suction duct, and as the moving element moves, the cleaning member removes dust such as toner adhering to the corona discharge electrode and discharge products caused by corona discharge. This enables stable and uniform discharge and always provides a good copy image.
can be done.

Further, since the drive means, mover, and cleaning member excluding the drive source are built into the ozone suction duct cabinet and shield, the number of components can be reduced and the entire device can be made smaller.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic plan view of the cleaning device of the present invention, and FIGS. 2 and 3 are a side sectional view in FIG. 1 and a sectional view taken along the line XX in FIG. 4 discharge wires (1) and 24 grid wires -17-
This shows a cleaning device for a scorotron in which a discharge wire cleaning pad (6) and a grid wire cleaning pad (7) made of non-woven fabric or the like are disposed inside a scorotron shield (4) to clean (5), respectively. It is.

- On the upper opening side of the shield (4) marked F, there is an ozone suction duct (8) in the longitudinal direction for discharging ozone emitted from the discharge wire (1) and the grid wire (5) to the outside of the aircraft. It is installed throughout. An ozone exhaust port (9) connected to an ozone suction means (not shown) is attached to the end of the ozone suction duct (8) on the rear side of the machine body in the longitudinal direction. 8) is provided with a mover (10), which will be described later.
) is provided with a slit (12) in the longitudinal direction through which the leg (11) of the holder is loosely fitted (see FIG. 6).

On the other hand, a mover (10) for moving both the cleaning pads <6> and (7) in the longitudinal direction of the shield (4) is moved inside the A-sin suction ducts 1 to (8). Possibly inserted. This mover (10) has fixed blocks (13) at both ends of the shield (4), respectively.
Driving wire 17-(1), which is a driving means installed on a driving pulley (15) and a driven pulley (16) disposed via (14), and movably stretched inside the duct (8).
7) and parallel to each other in the duct (8). It is slidably mounted on two guide bars (18) (see FIGS. 3 and 4). Further, the leg portion (11) hanging below the slider (10) passes through the sling h (12>) of the duct (8) in a loose-fitting manner, and a pad holding piece (19) is attached to the lower end of the leg portion (11). The cleaning pads (6) and (7) are removed through the pads.The cleaning pads (6) and (7) are made of non-woven fabric, etc. End block (2) as shown.

(3) It is attached so as to sandwich the upper and lower parts of the discharge wire (1) and grid wire (5) stretched between them, and +j W of toner etc. attached to each wire (1), (5) J: Removes objects: Sea urchins are turning.

Note that limit switches (20) and (21) are arranged at both ends of the ozone suction duct (8) in the longitudinal direction, respectively, to control stopping and direction change of the movable element (10). In this case, the limit switch (20) on the front side of the machine has the function of stopping the slider (10), and the limit switch (21) on the back side has the function of stopping the slider (10).
10) has the function of reversing the direction. Further, the shield (4) and the ozone suction duct (8) are fixed to the bracket (22), and the bracket (22) is fixed to the bracket (22).
22) to a frame (23) of the aircraft body (not shown). An ultra-small motor (24) is installed at the front end of this frame (23), and this motor (24) and the drive pulley (15) are connected to a gear (
25) and (26).

In the cleaning device of the present invention configured as described above, by pressing an operation button (not shown), the motor (2
4), the drive pulley (15) is driven and the drive wire (17) is moved;
7) moves the mover (10) inside the duct (8), and the cleaning pads (6) and (7) attached to the legs (11) move the discharge wire (1) and the grid wire (5), respectively. Move while holding. Therefore,
The cleaning pad (6) removes toner and other substances adhering to the discharge wire (1) and grid wire (5).

(7) is removed. And these wires (1)
, (5) are used to charge or defrost the surface of the photoreceptor (A).

In addition, in the above embodiment, the driving means is the shield (4).
Although the case has been described in which the drive wire (17) is installed between the drive pulley (15) and the driven pulley (16) arranged at both ends of the As shown in FIGS. 7(a) and 7(b), there is a drive-side screw shaft (27) rotatably disposed within the ozone suction duct (8), and this screw shaft (27).
) with a large number of balls (28) interposed between them, and a nut (29) fixed to the slider (10).
) The same effect as described above can be obtained by using a ball screw (30) composed of Furthermore, in the above embodiments, the case where the cleaning device of the present invention is used in a scorotron has been described, but it goes without saying that similar effects can be obtained in the case of a corotron.

[Effects of the Invention] As explained above, according to the cleaning device of the present invention, the driving means is movably disposed in the ozone suction duct attached to the opening side of the shield, and the driving means A movable member having a cleaning member that cleans the discharge electrode is fixed to the discharge electrode, thereby removing dust such as toner and discharge products associated with corona discharge that adhere to the discharge electrode, enabling stable and uniform discharge. Moreover, since the drive means, mover, cleaning member, etc., excluding the drive source, are built into the shield and the ozone suction duct, the number of components can be reduced and the entire device can be made smaller. Look, automatic W! Since II can be performed in a short time, excellent effects such as not interfering with copying work can be obtained by performing it during warming up before starting the copying machine, so its utility value is remarkable.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of the cleaning device of the present invention, FIG. 2 is a side sectional view of FIG. A plan view, FIG. 5 is a cross-sectional view showing the mounting state of the discharge wire and grid wire in this invention, FIG. 6 is a plan view of the ozone suction duct in this invention, and FIGS. 7 (a> and (b) are respectively A sectional view showing another embodiment of the present invention and its ■-
(2) Cross-sectional view, FIG. 8 is a schematic cross-sectional view showing the basic principle of an electrophotographic copying machine, FIG. 9 is a schematic perspective view of a corotron, and FIG. 10 is a schematic perspective view of a scorotron. Symbol explanation 1...Discharge wire 4...Shield 5...Grid wire 6...Cleaning pad for discharge wire 7...Cleaning pad for grid wire 8...Ozone suction duct 10...Movement Child 11...Leg 12...
Slit 15... Drive pulley 16... Driven pulley 17... Drive wire 24... Motor 27... Drive side screw shaft 28... Ball 29... Nut 30... Ball screw

Claims (3)

[Claims] (1) It has at least one corona discharge electrode, a shield that partially surrounds this electrode, and an ozone suction duct that is installed within this shield and discharges ozone emitted from the electrode to the outside. In the corona discharger, a driving means is movably disposed within the ozone suction duct, and a moving element is fixed to the driving means, and the moving element has a drive means movably disposed within the ozone suction duct. A cleaning device for a corona discharger, characterized in that a cleaning member for cleaning the electrode is attached via a leg portion that loosely fits through the electrode. (2) The cleaning device for a corona discharger according to claim 1, wherein the driving means is a driving pulley disposed at both ends of the shield and a driving wire installed over a driven pulley. (3) The drive means includes a drive-side screw shaft that is rotatably disposed within the ozone suction duct, a nut that is screwed to the screw shaft with a number of balls interposed therebetween, and is fixed to the slider. 2. A cleaning device for a corona discharger according to claim 1, which is a ball screw constructed of a ball screw.