CN204989758U - Charging device and image forming apparatus - Google Patents

Abstract

The utility model provides a through setting up two at least root zones electricity roller to the exoelectric electrified device of sensitization drum for stable electrified performance can be ensured to electrified device under the condition of not carrying out the AC overlapping, and adopts the image forming device of this electrification device. The utility model discloses a related electrified device of individual embodiment possesses: electrified roller, electrified roller is more than two, sets up around the sensitization drum to discharge to the sensitization drum, and the cleaning roller, set up two liang between the electrified roller and with electrified roller looks butt is used for cleanly electrified roller.

Description

Charging system and image processing system

Technical field

Embodiment of the present utility model relates to a kind of Charging system used in image processing system and the image processing system adopting this Charging system.

Background technology

Image processing system (MFP:Multi-FunctionalPeripheral in prior art, multi-function peripheral) carry out action by following steps: image read-out passes through scan manuscript, image data generating, then toner image is formed on the surface of photosensitive drums, again the toner image in photosensitive drums is transferred to belt transfer device, toner image is transferred on medium by belt transfer device, medium transferred with toner image is pressurizeed by the two sides of fuser to medium and is heated, with by fixing for toner image on medium, medium after fixing is discharged to discharge tray.Here photosensitive drums is by live line work after charged roller two ends applying DC bias voltage.

Wherein the working method of charged roller and photosensitive drums comprises contact and contactless, this contact is carried out close to electric discharge in the small space produced near the nip of photosensitive drums and charged roller by charged roller, when the rotational speed of photosensitive drums accelerates, can electrification time be there is short, be difficult to the problem of the carried charge keeping regulation.In addition in order to form stable nip, needing to be abutted with photosensitive drums by the material of soft, the polluter of photosensitive drum surface can be caused like this to be easy to move in charged roller, before the charged inequality of generation (image is uneven), need to carry out regular maintenance.

And cordless has certain space between photosensitive drums and charged roller, therefore contactless compared with contact charged roller is polluted little, but because the reasons such as the vibration of charged roller and environmental turbulence can produce larger impact to space variation, be easy to cause the charged inequality of photosensitive drums, therefore need the overlapping AC of DC bias voltage, but overlapping AC bias voltage can bring hazardous material to photosensitive drum surface, need at the surface of photosensitive drums coating lubricant, thus can the increase of constituent part and the complicated of device, also can cause the shortcomings such as machine intracorporeal space increase thereupon.

Utility model content

Charging system involved by an embodiment of the present utility model, possesses:

Charged roller, described charged roller is more than two, is arranged on around photosensitive drums, to discharge to photosensitive drums; And

Clearer, is arranged on and abuts against with described charged roller between described charged roller between two, for clean described charged roller.

Image processing system involved by an embodiment of the present utility model, possesses:

Scanner section, by scan manuscript to obtain optical analogy picture signal;

Photosensitive drums, carrying electrostatic latent image and toner image;

Exposure device, receives the optical analogy picture signal of described scanner section, and exposes the image forming area of described photosensitive drums, form described electrostatic latent image;

Charging system, for described photosensitive drums provides the electric charge forming described electrostatic latent image;

Developing apparatus, is developed the described electrostatic latent image be formed in described photosensitive drums by developer, to form described toner image; And

Transfer device, is transferred to offset medium by the described toner image be formed in described photosensitive drums;

Wherein, described Charging system comprises further:

Charged roller, described charged roller is more than two, is arranged on around described photosensitive drums, to discharge to described photosensitive drums; And

Clearer, is arranged on and abuts against with described charged roller between described charged roller between two, for clean described charged roller.

The utility model discharges to photosensitive drums by arranging at least two charged roller, makes Charging system can guarantee stable chargeding performance when not carrying out AC overlap.By clearer, charged roller surface is cleaned, decrease the hazardous material that photosensitive drum surface is brought, thus do not need lubricating structure.

Accompanying drawing explanation

Fig. 1 is the sectional view of image processing system of the present utility model;

Fig. 2 is the side view of the contact band electric installation of the utility model embodiment;

Fig. 3 is the installation site of Charging system shown in Fig. 2 schematic diagram;

Fig. 4 is the side view of the contactless Charging system of another embodiment of the utility model.

Embodiment

Below, embodiment of the present utility model is described.

Fig. 1 is the sectional view of image processing system of the present utility model.

As shown in Figure 1, the image processing system 100 in present embodiment comprises image forming part 10, possesses the supply unit 11 of pick-up roller 34, discharge portion 12 and scanner section 13.

Image forming part 10 possesses along intermediate transfer belt 15 that side by side Y (yellow), the M (magenta) of configuration, these four groups of images of C (cyan), K (black) form stand 16Y, 16M, 16C and 16K.Each image forms station 16Y, 16M, 16C and 16K around the photosensitive drums 17Y rotated along arrow a direction, 17M, 17C and 17K, possess Charging system 18Y, 18M, 18C and 18K of powering for photosensitive drums, electrostatic latent image in photosensitive drums is carried out developing apparatus 20Y, 20M, 20C and 20K of developing, and photosensitive drums clearer 21Y, 21M, 21C and 21K.

Exposure device 22 irradiating laser of image forming part 10, and electrostatic latent image is formed on each photosensitive drums 17Y, 17M, 17C and 17K.

Backing roll 27 and driven voller 28 support intermediate transfer belt 15, and intermediate transfer belt 15 is advanced along arrow b direction.Be positioned at primary transfer roller 23Y, 23M, 23C and 23K inside intermediate transfer belt 15 by being formed at each photosensitive drums 17Y, the toner image of 17M, 17C and 17K is primarily transferred on intermediate transfer belt 15, and toner image overlapped on intermediate transfer belt 15.Each photosensitive drums clearer 21Y, 21M, 21C and 21K remain in the toner on photosensitive drums 17Y, 17M, 17C and 17K after removing primary transfer.

The secondary transfer roller 35 be on the position that intermediate transfer belt 15 is relative with backing roll 27 is driven in intermediate transfer belt 15 and rotates along arrow c direction.Secondary transfer roller 35 using the toner image on intermediate transfer belt 15 together secondary transfer printing supply along transport path 36 from supply unit 11 as the thin slice P of recording medium.

Intermediate transfer belt 15, image form station 16Y, 16M, 16C and 16K, laser explosure device 22, primary transfer roller 23Y, 23M, 23C and 23K and secondary transfer roller 35 composing images forming portion.Image forming part 10 possesses fuser 9, distributing roller to 37 along transport path 36 in the downstream of secondary transfer roller 35.

When starting to print, MFP100 utilizes image forming part 10 to form toner image on thin slice P, toner image is fixing after thin slice P, thin slice P is expelled to discharge portion 12.

Fig. 2 is the side view of the contact band electric installation of the utility model embodiment; Fig. 3 is the installation site of Charging system shown in Fig. 2 schematic diagram.

As shown in Figure 1, 2, 3, each Charging system 18Y, 18M, 18C and 18K comprise more than two being separately positioned on around photosensitive drums 17Y, 17M, 17C and 17K with the charged roller 1 of discharging to it, and to be arranged between adjacent two charged roller 1 and to abut against with the clearer 2 of clean charged roller 1 with charged roller 1, this charged roller 1 can be many (at least 2).

In present embodiment, the structure of Charging system 18Y, 18M, 18C and 18K is consistent, and photosensitive drums 17Y, 17M, 17C and 17K structure also consistent, therefore illustrate for Charging system 18Y and photosensitive drums 17Y below.

Two charged roller 1 are passed through connected power supply (omitting diagram) and are applied DC bias voltage to two charged roller 1, thus charged, and rotate along with the rotation of photosensitive drums 17Y respectively, and photosensitive drums 17Y is by uniform charged.Abut with two charged roller 1 with the clearer 2 of two charged roller 1 reverse rotation, the foreign matters such as the toner that removing is attached in charged roller 1 or dust and dirt.Clearer 2 is such as formed by sponge etc.

Photosensitive drums 17Y can be made evenly charged by two charged roller 1, and clearer 1 can reduce the hazardous material on photosensitive drums 17Y surface.

With Fig. 2,3, first embodiment of the present utility model is described below.

Contact: two charged roller 1a, 1b of setting axially contact with photosensitive drums 17Y, two charged roller 1a, 1b keep at a certain distance away each other, clearer 2 is tubular, contacts respectively in the axial direction with two charged roller 1a, 1b simultaneously, and the position of contact is positioned at the opposite of photosensitive drums 17Y.

The driving of charged roller 1a, 1b can be driven in the driven wheel of photosensitive drums 17Y, also can drive.

Two charged roller 1a, 1b pass through connected power supply (omitting diagram) and apply DC bias voltage to two charged roller 1a, 1b, thus charged, and rotate along with the rotation of photosensitive drums 17Y respectively.Further, photosensitive drums 17Y is touched ground uniform charged.Abut with two charged roller 1a, 1b with the clearer 2 of two charged roller 1a, 1b reverse rotation, the foreign matters such as the toner that removing is attached on charged roller 1a, 1b or dust and dirt.

The diameter of charged roller 1a, 1b is different, and to suppress to feel the periodic charged inequality of drum 17Y, such as, the diameter of phi of charged roller 1a is the diameter of phi of 11mm, charged roller 1b is 10mm.

This structure can reduce the discharge position of the relative photosensitive drums 17Y of charged roller 1a, 1b, the carried charge of photosensitive drums 17Y can be made to stablize, and can tackle high speed.By select the material of high rigidity can also reduce charged roller 1a, 1b pollution and improve permanance.

Fig. 4 is the side view of the contactless Charging system of another embodiment of the utility model.

With Fig. 4, the second embodiment of the present utility model is described below.

Contactless: the charged roller 1 of setting is many (at least 2 1a, 1b), illustrates 2 in the diagram, but is not limited thereto.Charged roller 1a and 1b passes through the certain gap configuration of maintenance on photosensitive drums 17Y, two charged roller 1a, 1b keep at a certain distance away each other, clearer 2 is tubular, contacts respectively and the position contacted is positioned at the opposite of photosensitive drums 17Y while axial with two charged roller 1a, 1b.

The driving of charged roller 1a, 1b can be driven in the driven wheel of photosensitive drums 17Y, also can drive.

Two charged roller 1a, 1b pass through connected power supply (omitting diagram) and apply DC bias voltage to two charged roller 1a, 1b, thus charged, and rotate along with the rotation of photosensitive drums 17Y respectively.Further, photosensitive drums 17Y is by uniform charged non-contactly.Abut with two charged roller 1a, 1b with the clearer 2 of two charged roller 1a, 1b reverse rotation, the foreign matters such as the toner that removing is attached on charged roller 1a, 1b or dust and dirt.

After the arcing distance of charged roller 1a, 1b and photosensitive drums 17Y increases, can by being carried out the charged inequality of compensate for upstream side charged roller 1b by the charged roller 1a in downstream, thus can reduce due to charged roller 1a, between 1b and photosensitive drums 17Y, space changes the impact produced.

In this mode, the variation in space between photosensitive drums 17Y and charged roller 1a, 1b can be predicted according to the periodic vibration of charged roller 1a, 1b, therefore by making multiple charged roller 1a, 1b diameter between any two different and combination for not having common multiple, the periodic charged inequality of photosensitive drums 17Y can be suppressed.Such as, the diameter of phi of charged roller 1a is the diameter of phi of 11mm, charged roller 1b is 10mm.

Gap between photosensitive drums 17Y and charged roller 1a, 1b can be kept by component parts such as gap rollers.

This structure can reduce the discharge position of the relative photosensitive drums 17Y of charged roller 1a, 1b, the carried charge of photosensitive drums 17Y can be made to stablize, and can tackle high speed.By select the material of high rigidity can also reduce charged roller 1a, 1b pollution and improve permanance.

Although the description of several embodiment of the present utility model, but these embodiments are propose as an example, are not intended to limit scope of the present utility model.These new embodiments, can implement in other various modes, in the scope of main idea not departing from utility model, can carry out various omission, displacement, combination and change.These embodiments and its distortion are all contained in scope of the present utility model and main idea, and in the utility model be contained in described in claims and equivalency range thereof.

Claims (10)

1. a Charging system, is characterized in that, possesses:

Charged roller, described charged roller is more than two, is arranged on around photosensitive drums, to discharge to photosensitive drums; And

Clearer, is arranged between adjacent two described charged roller and also abuts against with adjacent described charged roller respectively, for clean described charged roller.

2. Charging system according to claim 1, is characterized in that,

Described charged roller is set to abut against with described photosensitive drums.

3. Charging system according to claim 1, is characterized in that,

Described charged roller is set to and described photosensitive drums gap spaced a predetermined distance.

4. Charging system according to claim 1, is characterized in that,

The diameter of each described charged roller is different.

5. Charging system according to claim 4, is characterized in that,

Diameter between any two described charged roller does not have common multiple.

6. an image processing system, is characterized in that, possesses:

Scanner section, by scan manuscript to obtain optical analogy picture signal;

Photosensitive drums, carrying electrostatic latent image and toner image;

Exposure device, receives the optical analogy picture signal of described scanner section, and exposes the image forming area of described photosensitive drums, form described electrostatic latent image;

Charging system, for described photosensitive drums provides the electric charge forming described electrostatic latent image;

Developing apparatus, is developed the described electrostatic latent image be formed in described photosensitive drums by developer, to form described toner image; And

Transfer device, is transferred to offset medium by the described toner image be formed in described photosensitive drums;

Wherein, described Charging system comprises:

Charged roller, described charged roller is more than two, is arranged on around described photosensitive drums, to discharge to described photosensitive drums; And

Clearer, is arranged between adjacent two described charged roller and also abuts against with adjacent described charged roller respectively, for clean described charged roller.

7. image processing system according to claim 6, is characterized in that,

Described charged roller is set to abut against with described photosensitive drums.

8. image processing system according to claim 6, is characterized in that,

Described charged roller is set to and described photosensitive drums gap spaced a predetermined distance.

9. image processing system according to claim 6, is characterized in that,

The diameter of each described charged roller is different.

10. image processing system according to claim 9, is characterized in that,

Diameter between any two described charged roller does not have common multiple.