CN1144105C - wet electrophotography printing machine - Google Patents

Abstract

A wet electrophotography printing machine, comprising: a plurality of latent electrostatic image forming mechanisms, each for forming an electrostatic latent image on a photosensitive belt in an endless track; a plurality of developing devices, each for making a developing solution fixed at the site where the electrostatic latent image is formed; a dryer for drying the developer remaining on the photosensitive belt to form a toner image; and a transfer mechanism for transferring the toner image to a recording paper , wherein the dryer includes a drying roll with brushes on the outer surface of the drying roll. Thus, the developer remaining on the photosensitive belt can be effectively removed.

Description

wet electrophotography printing machine

technical field

The present invention relates to a wet electrophotographic printing machine, and more particularly to a wet electrophotographic printing machine having an improved drier by which the liquid carrier remaining on the photosensitive belt can be efficiently removed.

Background technique

In general, electrophotographic printers are used in computer laser printers and copiers. According to the developing method, electrophotographic printing machines are classified into wet type and dry type, in which powdered toner is used in dry type, and in wet type, powdered toner mixed with a liquid carrier is used. In both types of printers, charged toner and liquid toner are transferred to a photosensitive medium, on which the electrostatic latent image is developed, and the paper is transferred from a rotating transfer mechanism in contact with the photosensitive medium. Through the middle, the desired image is printed on the paper.

Fig. 1 is a schematic diagram of a conventional wet electrophotography printing machine.

Referring to FIG. 1 , a photosensitive belt 11 is rotatably mounted by a driving roller 12 , a backup roller 13 and a control roller 14 . Along the rotation path of the photosensitive belt 11, a plurality of electrostatic latent image forming mechanisms 16 are provided for scanning and forming an electrostatic latent image on the photosensitive belt 11 by laser light, and a plurality of developing mechanisms 15 are provided for forming an electrostatic latent image on the photosensitive belt 11. A toner image is formed on it. Along the rotation path of the photosensitive belt 11, a main charger 17 for uniformly charging the photosensitive belt 11 is also installed. A transfer roller 21 is in contact with the backup roller 13 , the pressing roller 2 is in contact with the transfer roller 21 , and a recording paper 1 is inserted between the transfer roller 21 and the pressing roller 2 . A dryer 18 is arranged opposite the drive roller 12, and the photosensitive belt 11 is positioned between the drive roller 12 and the dryer 18.

In the electrophotographic printing machine having the structure described above, the surface of the photosensitive belt 11 must be chargeable, and its voltage must be controlled by scanning light. It is supported by the control roller 14 and runs along a predetermined track. The surface of the photosensitive belt 11 is charged with a uniform voltage by the main charger 17, and then an electrostatic latent image is formed on the surface of the photosensitive belt by the electrostatic latent image forming mechanism 16. The electrostatic latent image is formed in such a way that the laser light from the electrostatic latent image forming device 16 is selectively scanned on the surface of the photosensitive belt 11 with a uniform voltage so that the voltage of the relevant portion drops. A predetermined toner is fixed by the developing device 15 to the portion of the photosensitive belt 11 where the electrostatic latent image is formed, thereby forming a toner image. Here, the liquid carrier remaining on the photosensitive belt 11 is collected and recovered by a drier 18 .

FIG. 2 is an enlarged view of dryer 18 in FIG. 1 . The dryer 18 includes a drying roller 18b installed opposite to the drive roller 12 with the photosensitive belt 11 interposed therebetween, and a heating roller 18a in contact with the drying roller 18b. The outer surface of the drying roll 18b is made of a material that has an affinity for oil, and the inner surface of the drying roll 18b is made of a semi-oily material, so it is impossible for the liquid carrier to be absorbed into the outer surface of the drying roll 18b Penetrates drying roll 18b. The heating roller 18a contacting the drying roller 18b may be installed in plurality, each containing a halogen lamp therein.

According to the dryer 18 having the structure described above, the liquid carrier remaining on the photosensitive belt 11 is absorbed to the outer surface of the drying roller 18b, the absorbed liquid carrier is evaporated by the heat from the heating roller 18a, and the evaporated carrier It is concentrated and recovered in a condensed state, and then stored for reuse.

However, since the amount of the liquid carrier that can be absorbed by the absorbing layer made of a material having an affinity for oil and located on the outer surface of the drying roller 18b of the dryer 18 is limited, the liquid carrier on the photosensitive belt 11 cannot be sufficiently absorbed. Absorption, in particular, the trace amount of carrier present on the photosensitive belt cannot be eliminated, and its accumulation may make the photosensitive belt 11 not function properly.

Contents of the invention

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a wet electrophotographic printing machine having an improved drier with which the liquid carrier remaining on the photosensitive belt can be effectively removed.

To achieve the above object, a wet electrophotography printing machine provided includes: a plurality of latent electrostatic image forming mechanisms, each for forming an electrostatic latent image on a photosensitive belt in an endless track; a plurality of developing devices, each It is used to fix the developing solution on the part where the electrostatic latent image is formed; a dryer is used to dry the developing solution left on the photosensitive belt to form a toner image; and a transfer mechanism is used to transfer the toner image to Printing onto a recording paper, wherein the dryer includes a dryer roll with brushes on its outer surface for removing traces of liquid carrier remaining on the front side of the photosensitive belt.

Description of drawings

The above objects and advantages of the present invention will be more apparent from the following detailed description of a preferred embodiment with reference to the accompanying drawings.

Fig. 1 is the schematic diagram of conventional wet electrophotography printing machine;

Figure 2 is an enlarged view of the drier shown in Figure 1;

Figure 3 is a schematic diagram of a wet electrophotography printer according to the present invention;

FIG. 4 is an enlarged view of the dryer shown in FIG. 3 .

Detailed ways

As shown in FIG. 3, the photosensitive belt 31 is rotatably mounted by a drive roller 32, a backup roller 33, and a control roller 34. Along the rotation path of the photosensitive belt 31, a plurality of electrostatic latent image forming devices 36, a plurality of developing devices are installed. 35. A dryer 40 and a transfer mechanism.

A plurality of latent electrostatic image forming mechanisms 36, each having a laser scanner, scan the laser on the photosensitive belt 31 and generate a potential difference within the photosensitive belt 31, and form an electrostatic latent image based on the potential difference.

Along the rotation path of the photosensitive belt 31, a plurality of developing devices 35 and a main charger 37 are installed, each developing device 35 forms a toner image on the photosensitive belt 31, and the main charger 37 is used to make the surface of the photosensitive belt 31 With a uniform voltage, a transfer mechanism is installed above the support roller 33 .

The transfer mechanism includes a transfer roller 23 and a pressure roller 22, the transfer roller 23 is installed so that it is opposite to the backup roller 33, the photosensitive belt 31 is inserted between them, the pressure roller 22 is in contact with the transfer roller 23, to The image is transferred onto the recording paper 21 .

As shown in FIG. 4 , the dryer 40 next to the drive roller 32 includes a drying roller 41 and a vibration generator with brushes 42 on the outer surface of the drying roller 41 , and the vibration generator is located below the drying roller 41 . Various forms of vibration generators can be used, but in consideration of the area it occupies and the size of the carrier, the ultrasonic generator 43 is preferably used. The brush 42 is fixed on the outer surface of the drying roller 41, and is preferably made of an elastic material capable of effectively removing the carrier and taking into account the material of the photosensitive belt 31 without damaging the photosensitive belt 31. Here, what is in contact with the photosensitive belt 31 is not the drying roller 41 but the brush 42 fixed on the outer surface of the drying roller 41 . Thus, even if the rotational speeds of the photosensitive belt 31 and the drying roller 41 are different, no problem exists. However, the rotation speed of the drying roller 41 is preferably higher than that of the photosensitive belt 31 .

The surface of photosensitive belt 31 must be chargeable, and its voltage must be controlled by scanning light. In addition, photosensitive belt 31 is supported by driving roller 32, backup roller 33 and control roller 34, and runs along a predetermined track. The surface of the photosensitive belt 31 is charged with a uniform voltage by the main charger 37, and then an electrostatic latent image is formed on the surface of the photosensitive belt by the electrostatic latent image forming device 36. The electrostatic latent image is formed in such a way that the laser light from the electrostatic latent image forming device 36 is selectively scanned on the surface of the photosensitive belt 31 with a uniform voltage so that the voltage of the relevant portion drops.

A predetermined toner is fixed by the developing device 35 to the portion of the photosensitive belt 11 where the electrostatic latent image is formed, thereby forming a toner image. In this case, since the toner fixed on the photosensitive belt 31 is mixed with the liquid carrier, the liquid carrier is eliminated by the drier 40, and the brush 42 of the drying roller 41 installed in the drier 40 rotates faster than the photosensitive belt 31 at the same time. Soon, the liquid carrier of the photosensitive belt 31 is brushed off. The liquid carrier brushed off is condensed by a condensing device (not shown), and then stored for reuse. Carriers attached to the brush 42 are removed by ultrasonic waves generated by the ultrasonic generator 43 . The transfer roller 23 is installed in parallel with the support roller 33, and the photosensitive belt 31 is inserted between the two. After the liquid carrier carried by the toner image is eliminated through the process described above, the toner image is passed through the transfer roller 23. Transfer to recording paper 21. The recording paper 21 passes between the transfer roller 23 and the pressure roller 22 which are installed in parallel to each other. The toner image transferred onto the recording paper 21 is fixed by a separate fixing device (not shown), and finally a predetermined image is obtained.

In the above-described wet electrophotographic printer according to the present invention, the liquid carrier remaining on the photosensitive belt can be effectively eliminated.

In other words, since the dryer of the wet electrophotography printing machine contains brushes on the outer surface of its drying roller, the brushes come into contact with the photosensitive belt when the drying roller rotates, thereby effectively removing the trace amount of ink remaining on the photosensitive belt. liquid carrier.

Furthermore, according to the present invention, even the carrier remaining on the brush of the drying roller can be effectively eliminated.

In other words, the carrier brushed off from the photosensitive belt can be attached to the brush of the drying roller, however, in the dryer of the wet electrophotographic printing machine according to the present invention, the carrier attached to the brush can be passed through a The ultrasonic wave generated by the ultrasonic generator installed under the drying roller is effectively removed.

Although the present invention has described the embodiments, the present invention is not limited thereto, and various modifications and changes can be made by those skilled in the art without departing from the scope of the present invention.

Claims (4)

1. wet electrophotographic printer comprises:

A plurality of electrostatic latent images form mechanism, and each is used for forming an electrostatic latent image on the sensitization band of a circular orbit;

A plurality of developing apparatuss, each all is used to make developer solution to anchor at the position that forms electrostatic latent image;

An exsiccator is used for drying and stays developer solution on the sensitization band to form a width of cloth toner image; With

A transfer means is used for toner image is transferred to a recording chart,

Wherein exsiccator comprises a dryer roll, has brush on the outside surface of dryer roll, and described brush is used to remove the micro liquid carrier that remains on the sensitization band front.

2. according to the said wet electrophotographic printer of claim 1, wherein the rotational speed of dryer roll is higher than the rotational speed of sensitization band.

3. according to the said wet electrophotographic printer of claim 2, further comprise:

A vibration machine is used for the brush of dryer roll is applied an energy of vibration.

4. according to the said wet electrophotographic printer of claim 3, wherein vibration machine is the hyperacoustic ultrasonic generator of a generation.

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