JPS59125758A - Corotron for copying machine - Google Patents

Abstract

PURPOSE:To enable removal of foreign matter without removing a corotron by providing a means for applying force oscillation on an electric discharge electrode. CONSTITUTION:When a high voltage power source terminal 9 is connected to a high voltage power source, a high voltage is impressed to a discharge electrode 8 formed of a saw tooth-shaped thin metallic plate, and corona ion is released from the tips 8b of saw teeth to a photosensitive body disposed oppositely to the open end of a case 2 made of a channel-shaped metal. Even if foreign matter such as toner and paper powder sticks on the tips 8b of the electrode 8, the electrode 8 is oscillated in the thickness direction by operating a piezo-electric element 12 to dislodge the foreign matter and therefore even if the copying is made in a large number of times, the fluctuating rate of electric discharge hardly increases. There is therefore no need for cleaning the electrode 8 by removing the corotron and the maintenance and service are simple.

Description

[Detailed Description of the Invention] Is the non-invention in the Tamago photocopier? 1-i-Electrification, static elimination, transfer, etc. using f/C lath] is a stone's throw from the Rocorotron.

The corotron is the most commonly used charger in copying machines, in which a high voltage is applied to a hot wire, and corona ions are generated from the wire, thereby giving a positive or negative charge to the surface of the photoreceptor on the opposite side. 2], and it is used for a long time.

This corotron is compatible with other charging methods such as plan and conductive cloth.
Contact charging method using a roll σ) Compared to a charger, there is no contact with the photoreceptor 7: Because of this, there is no damage to the photoreceptor, the structure is simple and compact, and the cost is low. There is n, which is most often used in this calculator. 'Recently, negatively charged photoconductors such as boron photoconductors have been increasingly used for generating negatively charged ions.
In the case of negative charging, unlike in the case of positive charging, emission bright spots tend to occur unevenly, and a stable band can be obtained.
), the scorotron system has been put into practical use by arranging a grid wire between a conductive corotron wire and a photoreceptor to stabilize the charging of the photoreceptor.

However, the scorotron requires the application of a high voltage and has the disadvantage of generating a large amount of ozone.

Therefore, a serrated cedar corotron has been used to apply a high voltage to a thin metal plate VC.
The tooth-shaped corotron, like a normal corotron, has its maximum σ) bright spot G, and toner used as a developer, dust in the air, paper powder, etc. adhere to the discharge electrode due to electrostatic force and discharge. becomes unstable, specifically,
The main points of Figure 4 are as shown in Figure 6, the maximum variation in discharge current, the width △ (with respect to the longitudinal direction) and the average discharge current (with respect to VC). The ratio (%) of discharge and fluctuation rate increases significantly as the number of carp shots increases.

For this reason, it is necessary to periodically clean the serrated discharge 1, and when cleaning it, the sharp serrated tip is used to remove the fingers and the filter 1. ], which is dangerous.Also, the serrations were easy to break (or break).

Overcoming such difficulties 1-Regarding the improvement of the 2-corotron, the purpose and location is to easily remove foreign substances without removing the corotron). be.

Hereinafter, there will be one item shown in Figures 11 to 3 [A (invention θ)]
]Explanation 1-ro regarding one embodiment.

1 is a corotron invented in Raiko Shashisha's photo book σ) - Real 111 example, and the same corotron lσ) Chan 2, Ru-shaped metal case 2θ] On the inner surface of the bottom, there is a prayer 1 to 3. Stick to one thing and stay old.

In addition, the insulating material 3 has a vertical groove 4 formed thereon, and a hole 5 is formed on one end of the longitudinal groove 4g. 8a loosely fits into the vertical groove 4, and the same 08σ] il:tll long end note Is is mI
A high-voltage power supply terminal 9 is formed in the same elongated corridor, and the same high-voltage terminal 9 is connected to a high-voltage power supply. The A line (No. 1 in the diagram) is a removable VC.
(Note that the discharge electrode 8 may be configured to be freely connected to the high-voltage power supply terminal 9 in layers).

Both +1 of the vertical groove 4 at the insulating part 41' 3 at the glare Q! !
7. ft'! Holes 7 are formed at predetermined intervals in the L-shaped portion 6], and the opening electrode 8 is placed at the bottom of the bottom part 6] Motoki S8
1741i4 equal to the above-mentioned 1fA1 spacing to a) The hole 10 has a larger diameter than the hole 7 of the shape ff2. 'EE +l+
,, rJli = g A pin having approximately the same diameter as the small diameter hole 7 is fitted into the hole 7 with an OK loose fit 1''l, and the discharge electrode 8 is insulated M15, IZ'
3, it moves freely in the thickness direction.

Roughly, both sides of the piezoelectric element 2 are integrally pasted 11 on one side surface of the vertical groove 4σ) and the side surface of the fundamental tone 1s8a of the opposite pitch-radiating pole 8.

The embodiments shown in FIGS. 1 to 31 are constructed as described above, with the high voltage power supply terminal 9 connected to the high voltage terminal 9 shown in FIG. ji: A high surface pressure is applied to the toothed thin metal plate plate 8 with a closing force of 1''], from the base of the plate 8! "li' case 2 (J) open end Vc 1
1. Corona ions are emitted from the photoconductor without any medical indication. 21. l).

PA: An example of a real tumor is an electric-sensitive corotron wire and a base, Hogame City, f1 Hiroshi 8θ tip 81], or formed into a hammered serrated shape], and all directed toward the light body 71 Because
Ho'ichi Tokuryu is airy (de utilization ha, ozone) (he) year of birth is 1ill 1ilj 21st year of age.

Zara Hite Second, Out, ItilJ! 8 d
Even if foreign objects such as -1, 4, etc., 8B and A-1 are installed, the piezoelectric element 12 may be over 1V+, which may cause a discharge. Move the electrode 8 in the thickness direction to scrape off foreign matter.
) Therefore, in the non-example, even if the number of copies exceeds 50,000, there is no need to remove the corotron and clean the discharge and cathode 8, and maintenance is possible. It becomes easy.

In the embodiment, the piezoelectric element 12 is connected to the adjacent pins 11θ.
), but the piezoelectric element 12 is placed at the antinode of the standing wave of the transverse vibration of the discharge electrode 8, and the piezoelectric element 12 is operated at a frequency that is 1/1 to the natural frequency that causes the identified standing wave. The foreign body α] (I
A stone that improves the Ik-removal effect.

In addition, in the non-example, 11ヰ, pressure 7 (3, element) 2 discharge, positive electrode 3 &) swinging in the thickness direction was made to be like a knife [], discharge, pole B v) longitudinal direction. It is also possible to vibrate in the direction of cD"4 roughly by a piezoelectric element, the discharge electrode 8 is supported by a wire, the vibration system is shaded 1, 'j+, and the magnet is used to stop the vibration. ν8 ((stretching force) J[1e, (
Base 1 #++= i thread θ) F released by vibration or resonance
g. You can also set the 8th sword or the 8th sword [] + J frame.

X i? In the corotron, a means for applying forced vibration to the discharge electrode was provided, and the means was operated to cause the same discharge. Ichi was able to excite Gin, and the same discharge +1.
4. Drop and remove the foreign matter attached to the iIl and remove the stone t1
We need to maintain high performance in field operations.

This θ〕A', in the present invention, the discharge and characteristics can be maintained in high water (5°) without removing the corotron.

[Brief explanation of the drawing]

Figure 1 Mouth'A [Regarding the invention, terrible photo shooting] Corotron 1' A knee E (ti example I sentence I perspective view 1 figure, arithmetic 21 sjG false number vertical section 11i' j 17111XI,
3rd grade Figure if Pre-2 m I] IIJ Ill 8
It is a characteristic diagram illustrating the relationship between the number of interlocking shots, the discharge movement rate, and θ] in the VC truncated lateral pressure X-plane darkness, the a-technique 4+ZC1 conventional Q corotron and the example described in 1Vii. 1. Corotron, 2. Channel-like m K W Mekas, 3... End, part line, 4 Vertical, 5. Hole, 6 Ryo +
E1114fl＞min, 7...hole, 8...serrated metal thin film discharge electrode, 9...takako power supply terminal, 10...hole, 1
1...Bin, 12 Piezoelectric element. Agent 4 Tokonshi Jianghara Bokkei Outside 1 name and tail 2 wards 3 Figure 1 No. 4 Closed￥MizuL Hui, /44 ± 7, /2 −11τ−x−11=

Claims (1)

[Claims] A corotron of a copying machine is characterized by having means for applying forced vibration to one pole of the discharge box in a copying machine equipped with one pole of a discharge box made of a sawtooth thin metal plate.