CN1210284A

CN1210284A - Wet electrophotographic printer

Info

Publication number: CN1210284A
Application number: CN98106222A
Authority: CN
Inventors: 方正勋
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 1997-08-30
Filing date: 1998-04-08
Publication date: 1999-03-10
Anticipated expiration: 2018-04-08
Also published as: CN1144105C; KR19990011208U; KR200187155Y1

Abstract

A wet electrophotographic printer includes: a plurality of electrostatic latent image forming mechanisms, each of which is used to form an electrostatic latent image on the photosensitive strip of a circular orbit; a plurality of developing devices, each of which is used to make the developer solid at the location forming the electrostatic latent image; a dryer for drying remained developer on the photosensitive strip to form a color dye image; and a transfer printing mechanism for transfer and printing the color dye image to a recording paper, wherein the dryer includes a dry roller, on the external surface of which is provided with a brush. Thereby, the developer remained on the photosensitive strip can be effectively removed.

Description

Wet electrophotographic printer

The invention relates to a kind of wet electrophotographic printer,, can remove the liquid-carrier of staying on the sensitization band efficiently by this exsiccator particularly about a kind of wet electrophotographic printer with an improved exsiccator.

Usually, electrical photography printing machine is applied to the laser printer and the duplicating machine of computing machine.According to developing method, electrical photography printing machine is divided into wet type and dry type, uses Powdered toner in the dry type machine, and what use in the wet type machine is the Powdered toner that mixes with a kind of liquid-carrier.In two types printer, charged toner and liquid toner are sent on a kind of light-sensitive medium, electrostatic latent image is developed on this light-sensitive medium, and paper passes through in the middle of the transfer means of a rotation that contacts with light-sensitive medium then, thereby prints off needed image on paper.

Fig. 1 is a kind of synoptic diagram of traditional wet electrophotographic printer.

With reference to figure 1, sensitization band 11 is rotatably installed by a driven roller 12, a backing roll 13 and a control roll 14.Along the rotation path of sensitization band 11, be provided with a plurality of electrostatic latent images and form mechanism 16, be used on sensitization band 11, scanning the formation electrostatic latent image, and be provided with a plurality of developing mechanisms 15 by laser, be used on sensitization band 11, forming toner image.Along the rotation path of sensitization band 11, a main charger 17 also is installed, be used to make sensitization band 11 uniform chargeds.One transfer roll 21 contacts with backing roll 13, and pressure roller 2 contacts with transfer roll 21, and a recording chart 1 is inserted between transfer roll 21 and the pressure roller 2.Facing to driven roller 12 devices one exsiccator 18 is arranged, sensitization band 11 is between driven roller 12 and exsiccator 18.

In having the electrical photography printing machine of structure recited above, the surface of sensitization band 11 must be chargeable, and its voltage must control by scan light can, in addition, sensitization band 11 supported by driven roller 12, backing roll 13 and control roll 14, and along a predetermined track operation.Make the surface of sensitization band 11 have even voltage by main charger 17, form mechanism 16 by electrostatic latent image then and form an electrostatic latent image on the surface of sensitization band.Electrostatic latent image is to form like this, and the laser selective ground that forms device 16 from electrostatic latent image scans on the surface of the sensitization band 11 that has even voltage, thereby the voltage of region of interest descends.Make predetermined toner be fixed on the position that is formed with electrostatic latent image on the sensitization band 11 by developing apparatus 15, thereby form toner image.Here, the liquid-carrier of staying on the sensitization band 11 is concentrated and recovery by exsiccator 18.

Fig. 2 is the enlarged drawing of the exsiccator 18 among Fig. 1.Exsiccator 18 comprises a dryer roll 18b and a warm-up mill 18a, and it is relative with driven roller 12 that dryer roll 18b installs, and sensitization band 11 is inserted between them, and warm-up mill 18a contacts with dryer roll 18b.The outside surface of dryer roll 18b has the material of affinity to make with a kind of with oil, and the inside surface of dryer roll 18b is made by a kind of half oily material, and therefore, the liquid-carrier that is absorbed into the outside surface of dryer roll 18b can not infiltrate dryer roll 18b.The warm-up mill 18a that contacts with dryer roll 18b can install a plurality of, and Halogen lamp LED is all contained in each the inside.

According to exsiccator 18 with structure described above, stay the outside surface that liquid-carrier on the sensitization band 11 is absorbed into dryer roll 18b, this absorbed liquid-carrier is by the thermal evaporation from warm-up mill 18a, the carrier that is evaporated is concentrated with a kind of condensing state and is reclaimed, and stores reuse then.

Yet, owing to can be limited by the quantity of the liquid-carrier that absorption layer absorbed of the outside surface of that the material of affinity is made, as to be positioned at exsiccator 18 dryer roll 18b being arranged with oil, liquid-carrier on the sensitization band 11 can not fully be absorbed, particularly, the micro-carrier that exists on the sensitization band can not cancellation, and it gathers and may make sensitization band 11 cisco unity malfunctions.

For solving top problem, an object of the present invention is to provide a kind of wet electrophotographic printer with an improved exsiccator, with this exsiccator effectively cancellation stay liquid-carrier on the sensitization band.

For achieving the above object, the wet electrophotographic printer that is provided 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, be 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.

Above-mentioned purpose of the present invention and advantage are by will be clearer to the detailed description of a most preferred embodiment below with reference to accompanying drawing.

Fig. 1 is the synoptic diagram of traditional wet electrophotographic printer;

Fig. 2 is the enlarged drawing of the exsiccator shown in Fig. 1;

Fig. 3 is the synoptic diagram according to wet electrophotographic printer of the present invention;

Fig. 4 is the enlarged drawing at the exsiccator shown in Fig. 3.

As shown in Figure 3, sensitization band 31 is rotatably installed by driven roller 32, backing roll 33 and control roll 34, along the rotate path of sensitization band 31, a plurality of electrostatic latent images are installed form devices 36, a plurality of developing apparatus 35, an exsiccator 40 and a transfer means.

A plurality of electrostatic latent images form mechanism 36, and each has a laser scanner, are used for forming an electrostatic latent image carrying out laser scanning on the sensitization band 31 and produce a potential difference (PD) in sensitization band 31 according to this potential difference (PD).

Rotate path along sensitization band 31, a plurality of developing apparatuss 35 and a main charger 37 are installed, each developing apparatus 35 forms a toner image on sensitization band 31, main charger 37 is used to make the surface of sensitization band 31 to have uniform voltage, above backing roll 33 transfer means is housed.

Transfer means comprises a transfer roll 23 and a pressure roller 22, and what transfer roll 23 was installed makes it relative with backing roll 33, and sensitization band 31 is inserted between them, and pressure roller 22 contacts with transfer roll 23, so that image is transferred on the recording chart 21.

As shown in Figure 4, the exsiccator 40 that is positioned at driven roller 32 next doors comprises a dryer roll 41 and a vibration machine, has brush 42 on the outside surface of dryer roll 41, vibration machine be positioned at dryer roll 41 below.Various forms of vibration machines be can adopt, but the area that it is occupied and the size of carrier, the most handy ultrasonic generator 43 considered.Brush 42 is fixed on the outside surface of dryer roll 41, and is preferably made by a kind of resilient material, with this resilient material cancellation carrier and consider the material of sensitization band 31 and can not damage sensitization band 31 effectively.Here, what contact with sensitization band 31 is not dryer roll 41, but is fixed on the brush 42 on the outside surface of dryer roll 41.Even the rotational speed difference between sensitization band 31 and the dryer roll 41 does not have the problem existence yet like this.But the rotational speed of dryer roll 41 preferably is higher than the rotational speed of sensitization band 31.

The surface of sensitization band 31 is essential chargeable, and its voltage must control by scan light, and in addition, sensitization band 31 supported by driven roller 32, backing roll 33 and control roll 34, and along a predetermined track operation.Make the surface of sensitization band 31 have even voltage by main charger 37, form device 36 by electrostatic latent image then and form an electrostatic latent image on the surface of sensitization band.Electrostatic latent image is to form like this, and the laser selective ground that forms device 36 from electrostatic latent image scans on the surface of the sensitization band 31 that has even voltage, thereby the voltage of region of interest descends.

Make predetermined toner be fixed on the position that is formed with electrostatic latent image on the sensitization band 11 by developing apparatus 35, thereby form toner image.In this case, because the toner that is fixed on the sensitization band 31 mixes with liquid-carrier, liquid-carrier is by exsiccator 40 cancellations, and the rotational speed of brush 42 that is installed in the dryer roll 41 in the exsiccator 40 simultaneously is faster than sensitization band 31, and the liquid-carrier of sensitization band 31 is brushed.The liquid-carrier that is fallen by brush passes through the condensation of a condensing unit (not shown), stores reuse then.The carrier that is attached on the brush 42 is removed by the ultrasound wave that ultrasonic generator 43 produces.Transfer roll 23 and backing roll 33 parallel installations, sensitization band 31 is inserted between the two, liquid-carrier that toner image had through process described above by cancellation after, this toner image is transferred on the recording chart 21 by transfer roll 23.Recording chart 21 passes through between the transfer roll 23 of installation parallel to each other and pressure roller 22.The toner image that is transferred on the recording chart 21 is passed through an independently fixing device (not shown) photographic fixing, obtains a width of cloth predetermined picture at last.

Described in the above according in the wet electrophotographic printer of the present invention, the liquid-carrier of staying on the sensitization band can be by cancellation effectively.

In other words, because the exsiccator of wet electrophotographic printer includes brush on the outside surface of its dryer roll, brush and photosensitive belt touch when dryer roll rotates, thereby remove the micro liquid carrier of staying on the sensitization band effectively.

In addition, according to the present invention, even the carrier of staying on the brush of dryer roll also can be by cancellation effectively.

In other words, from the sensitization band, can be attached on the brush of dryer roll by the carrier under the brush, yet, in the exsiccator according to wet electrophotographic printer of the present invention, the carrier that is attached on the brush can be removed effectively by a ultrasound wave that ultrasonic generator produced that is contained in below the dryer roll.

Though the invention describes embodiment, invention is not limited to therewith, and those of ordinary skill in the art does not depart from the scope of the present invention still can do various modifications and conversion.

Claims

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.

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.