JPS6267577A - Cleaning method for recording medium - Google Patents

Abstract

PURPOSE:To clean remaining toner on a recording medium without contact and to prolong the life of the medium by constituting such that a metallic roller scatters the remaining toner due to an AC voltage overlapping with a bias voltage, and a DC bias voltage attracts the scattered toner. CONSTITUTION:The metallic roller 10 faces the recording medium 1 with an interval of 0.4mm, for instance. An AC power source 11 generates such an AC voltage that its frequency is 1kHz, for instance, and a voltage from one peak to another is 3kV. When the toner 14 is electrostatically charged at a normal voltage, a DC power source 12 generates a negative DC bias voltage of -400V, for instance. When such a DC voltage is impressed on the metallic roller 10, the toner 14 remaining on the recording medium 1 jumps completely from the recording medium 1, is attracted by the DC bias voltage and attaches to the metallic roller 10. A blade 10 scrapes the attached toner 14 out of the metallic roller 10, and collects it.

Description

[Detailed Description of the Invention] [Summary] When cleaning toner remaining on a recording medium, a metal roller facing the recording medium without contact is provided, and an AC voltage superimposed on a DC bias voltage is applied to the metal roller. By ejecting toner from a recording medium using AC voltage and adsorbing the ejected toner onto a metal roller using DC bias voltage, it was possible to significantly extend the life of the recording medium.

[Industrial application field]

The present invention relates to a mechanism for developing a latent image formed on a recording medium such as a printing device or a copying device using an electrostatic recording method using toner and transferring it to paper, and in particular, it relates to a mechanism for developing a latent image formed on a recording medium such as a printing device or a copying device using an electrostatic recording method and transferring it to paper. The present invention relates to a recording medium cleaning method that can clean toner without contact and extend the life of the recording medium.

In printing devices, copying devices, and the like that use electrostatic recording, a latent image is formed on a recording medium using light or the like, and toner is applied to this latent image to develop it. The developed toner is then transferred onto paper to print or copy desired characters, figures, etc.

By the way, not all of the toner attached to the latent image on the recording medium is transferred to the paper, but some remains on the recording medium, and it is necessary to clean this residual toner, but by cleaning, It is necessary that the life of the recording medium is not shortened due to stress being applied to the recording medium.

[Conventional technology]

FIG. 4 is a diagram illustrating an example of a conventional cleaning method.

The recording medium 1 usually has a drum shape and rotates in the direction indicated by the arrow. This recording medium 1 is charged by a charger 2, and a latent image is formed by, for example, a laser beam sent out from a light source 3. The developing device 4 attaches toner to this latent image and develops it.

The developed toner is transferred onto the recording medium 1 by the transfer device 6, but not all of the toner is transferred and a portion remains on the recording medium 1.

The recording medium 1 is neutralized by the static eliminating lamp 7, and residual toner can be easily cleaned.

In the cleaning device 8, for example, a sponge roller 9 comes into contact with the recording medium 1 and rotates as shown by the arrow, thereby removing residual toner by rubbing the recording medium 1.

Conventional methods for cleaning residual toner on a recording medium include, in addition to the method of scraping off the toner with the sponge roller 9 as described above, a method of wiping it off with a fur brush, a method of scraping it off with a blade, etc.

[Problem that the invention seeks to solve]

All of the above conventional methods clean the toner by directly contacting the recording medium, which causes stress on the recording medium and shortens the life of the recording medium.

In view of these problems, the present invention disposes a metal roller that faces the recording medium and maintains a small gap, and applies an AC voltage to this metal roller to which a DC bias voltage with a polarity opposite to that of the toner is applied. is applied to make the residual toner fly off the recording medium, and then this metal roller adsorbs the flying toner to remove the residual toner and clean the recording medium without contacting the recording medium. be.

[Means for solving problems]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

A metal roller 10 faces the recording medium 1 at a slight distance. Reference numeral 11 is an AC power supply that supplies an AC voltage to the metal roller 10, and reference numeral 12 is a DC power supply that supplies a DC bias voltage with a polarity opposite to the charged polarity of the toner.

13 is a blade for scraping off toner 14 adhering to the metal roller 10; 14 is toner remaining on the recording medium 1;

The metal roller 10 is configured to fly the toner remaining on the recording medium 1 using an AC voltage supplied by an AC power supply 11 that is superimposed on a DC bias voltage supplied by a DC power supply 12, and to attract this flying toner by the DC bias voltage. shall be.

[Effect]

With the above configuration, the metal roller 10 can adsorb the residual toner 14 without contacting the recording medium 1 and can clean the recording medium 1 without applying stress to it.

〔Example〕

In FIG. 1, a metal roller 10 faces the recording medium 1 with an interval of, for example, 0°4. The AC power supply 11 generates an AC voltage with a peak-to-peak voltage Vl)p of 3 KV at a frequency IKlfz, for example.

If the toner 14 is charged with a positive voltage, the DC power supply 12 generates a negative DC bias voltage of, for example, -400 cm.

Figure 2 is a diagram explaining an example of DC bias voltage;
The figure is a diagram showing an example of an AC voltage to which a DC bias voltage is added.

When the metal roller 10 faces the recording medium 1 at an interval of <0.4+n as described above, and when Vl)I) is an AC voltage of 3KV, the DC bias voltage Voff becomes a discharge region at about 600V, and the cleaning efficiency is 100V. %, the range of the DC bias voltage is from about 350V to 600V, as shown in FIG.

Therefore, the metal roller 10 has a V
An AC voltage with Pp of 3 KV is applied.

When such an AC voltage is applied to the metal roller 10, the toner 14 remaining on the recording medium 1 is
The blade 13, which flies 0% apart and is attracted by the DC bias voltage and adheres to the metal roller 10, scrapes off the adhered toner 14 from the metal roller 10 and collects it.

〔Effect of the invention〕

As explained above, since the present invention can clean toner remaining on a recording medium without contact, stress is not applied to the recording medium, and the life of the recording medium can be significantly extended.

[Brief explanation of drawings]

FIG. 4 is a diagram illustrating an example of a conventional cleaning method. In the figure, 1 is a recording medium, 2 is a charger, 3 is a light source, 4 is a developer 1, 5 is paper, 6 is a transfer device, 7 is a static elimination lamp, 8 is a cleaner, 9 is a sponge roller, and 10 is metal Roller, 11 is AC power supply, I2 is DC power supply, 13 is blade, 1
4 is residual toner. Thursday 8f) - Ethnic group to the 13th day of the 13th year of the 1st year of the year of the year of the year of the year of the year of the year.

Claims (1)

[Claims] A device for developing a latent image obtained on a recording medium (1) by an electrostatic recording method with toner and transferring it to paper, comprising: maintaining a slight gap in the recording medium (1); metal rollers (10) facing each other; a DC power supply (12) that supplies a DC bias voltage with a polarity opposite to the charged polarity of the toner; and an AC power supply (11) that generates an AC voltage that causes the toner to fly from the recording medium (1). ), and the DC bias voltage supplied by the DC power supply (12),
The AC voltage generated by the AC power source (11) is superimposed and supplied to the metal roller (10), and the toner flying from the recording medium (1) is attracted to the metal roller (10) by a DC bias voltage. A method for cleaning a recording medium, characterized by: