JPS6041074A - Cleaning device of magnetic image forming device - Google Patents

Abstract

PURPOSE:To obtain an invariably excellent image by providing a small-sized, simple cleaning means which incorporates a heater and is provided with a cleaning roll having a sponge layer for scraping residual toner at the outer circumference of the heater. CONSTITUTION:When a magnetic recording medium 4 is passed under a permanent magnet 2, the magnetic recording medium 4 is magnetized in one direction to erase a magnetic latent image, and magnetic toner stuck with a leak magnetic field becomes hard to separate. Then, the magnetic recording medium 4 is brought into contact with the sponge 15B of the 2nd cleaning device 14. The sponge 15B contains about 3wt% magnetic toner preferably in advance so as to improve the stickiness and affinity to the residual toner, and made of heat-resisting rubber molded after vulcanization. The sponge 15B is heated by a quartz lamp 15C, so the magnetic toner in the sponge 15B is softened by the heat conduction from the quartz lamp 15C to move the toner to the surface of the sponge 15 completely through the stickiness and affinity.

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a method for removing residual toner from a thermal head by heating and softening residual toner that has not been completely cleaned by a cleaning means provided after the transfer means. The present invention relates to a cleaning device f19 in a magnetic image forming apparatus in which the cleaning device f19 is prevented from being damaged.

[Prior art]

As an example of a conventional magnetic image forming apparatus, there is one shown in FIG. This magnetic image forming apparatus coats a chromium dioxide magnetic layer at a temperature of about 125°C on the surface of a film made of polyester, etc., and rolls 10 and 11 of the tape.
, 12. Magnetic recording medium 4 stretched in an infinite shape by 13
and a permanent magnet 2 that magnetizes the magnetic recording medium 4 in a predetermined direction.
Then, in order to give a magnetic latent image, the heating array 1 and the magnetic recording medium 4 are heated, and a permanent magnet is provided on the opposite side of the heating array 1 and applies a weak magnetic field in the opposite direction to the permanent magnet 2. 3, a developer 6 that develops the magnetic latent image with toner, and a pre-transfer corotron 13A that charges the magnetic toner and increases transfer efficiency in the transfer stage.
, a transfer device 8 (including a transfer corotron 13B'i), a fixing device 9, a cleaning device 5, and the like.

In the above configuration, rolls 10, 11, and 12.

When the N moving roll 13 is driven by a motor (not shown), the magnetic recording medium 4 moves in the direction of the arrow at a predetermined speed t'. The magnetic recording medium 4 is a permanent magnet 2
The magnetic layer is magnetized in one direction by the heating resistor IA of the heating array 1, and the magnetic layer is heated to a certain temperature in accordance with the image signal. Since a weak magnetic field in the opposite direction is applied by the permanent magnet 3, the heated region is cooled by a thermal residual magnetism phenomenon, and after cooling, magnetization in the opposite direction to the one direction magnetization, that is, a magnetic latent image corresponding to the image signal is generated. This latent image is visualized by trapping magnetic toner in a developing device 6, fully charged to the toner in a transfer corotron 13A, and transferred onto a recording paper 7 by a transfer device 8 (having a transfer corotron 13B). After the transfer, the recording paper is fixed permanently by the fixing device 9. After the magnetic recording medium 4 has been transferred, residual magnetic toner is completely removed by a cleaning device 5 using a blade method or a vacuum suction method, and the process proceeds to the next latent image forming process.

However, in a conventional magnetic image forming apparatus, when the heating head was observed after repeated cycles of magnetization, development, and transfer, magnetic toner was found to have adhered to the surface of the heating resistor IA. This f; Some omissions occurred and it was not practical. For this reason, a method was used to remove the residual toner using two blades and a 14-color plan, but even if a large number of blades were used, a certain level of lubricity between the blade and the magnetic recording medium 4 was required. There is a limit to the improvement of cleaning characteristics due to vomiting, and when multiple brushes are used, the device turns into a large trap, resulting in unsatisfactory results.

[Object and structure of the invention]

The present invention has been made in view of the above, and it is possible to completely remove residual magnetic toner that could not be removed by a cleaning device using a vacuum suction method or a blade method, and to transfer the magnetic toner to the heating resistor element IA of the heating RAD array L. In order to prevent the adhesion of residual magnetic toner and always obtain good images, a small and simple cleaning means is provided with a built-in heater and a cleaning roll f located on the outer periphery with a sponge layer for wiping off the residual toner. The present invention provides a cleaning device for a magnetic image forming apparatus which includes the following features:

〔Example〕

A cleaning device for a magnetic image forming apparatus according to the present invention will be described in detail below. FIG. 2 shows an embodiment of the invention. A magnetic recording medium 4, a permanent magnet 2, a heating radar array 1 having a heat generating resistor IA, and a permanent magnet that is provided on the side opposite to the heating head array 1, sandwiching the magnetic recording medium 4 and applying a weak magnetic field in the opposite direction to the permanent magnet 2. 3, developing device 6, transfer device 8
, the fixing 34 is cleaned by a cleaning device consisting of a fur brush, a blade, etc., which is the same as the conventional method shown in Figure 281. On the right, between the permanent magnet 20 position 11c and the position of the heating radar array 1, the cleaning device 14 of 2 is installed.
It differs from the conventional method in that it provides the following. Third
1 is a detailed explanatory diagram of a cleaning device 1.1 for lpl I, J,' f, -4:l; FIG. Second cleaning 4~
Question 14 is about the hollow aluminum ship i:','.
Good quality, Cj; metal pipe (inner thickness 2 ra/n, outer diameter 3
Or+r! )], 51 and 15 Cf quartz lamps are placed inside.11. , outside (till f + 645.7
jr'7;! rubber sponge] 513 a (:
'5τN, l-1. , the surface of the roll 15B touches the magnetic recording medium 4: the roll 15 installed on the
, magnetic recording Jj, push up body I from the back (magnetic)
'j・'t IG and sjζnjil! j Back 7゛ roll 16 that acts so that the surface of B touches well
The blade 19 is configured to remove the magnetic toner 17iJi7 adhering to the surface of the sponge 15X1 and can be lightly contacted with the surface of the sponge 15B.

In the above configuration, the Q operation will be omitted because the operation from magnetization by the permanent magnet 2 to the first cleaning device 5 is the same as the conventional method. In the second cleaning device ff14 of the present invention, the roll 15
and the backup roll 16 is the magnetic recording medium 4 is the roll 1
The roll 15 rotates counterclockwise and the backup roll 16 rotates clockwise in synchronization with the movement in the direction of the arrow due to the rotation of 0°11.12.13.

The roll 15 is heated by a quartz lamp 15C, and the surface temperature of the sponge 15B is maintained at 60 DEG C. to 100 DEG C., most preferably 80 DEG C., by an appropriate blade surface humidity control system (not shown). Although most of the magnetic toner remaining on the magnetic recording medium 4 is removed by the first cleaning device 5, the magnetic toner 18 that is not removed still remains. Next, when the magnetic recording medium 4 is passed under the permanent magnet 2, the magnetic recording medium 4 is magnetized in one direction, the magnetic latent image disappears, and the attached magnetic toner is easily separated by the leakage magnetic field. Next, the magnetic recording medium 4 is transferred to the sponge 1 of the second cleaning device 14.
Contact with 5B. Sponge 15 In order to increase Bu residual toner, adhesion, and oleophilicity, apply about 3 liters of magnetic toner in advance.
It is preferable to contain wt rubber, and it is composed of a heat-resistant rubber (for example, silicone rubber) obtained by vulcanizing and molding this. Since the sponge 15Bij is heated by the quartz lamp 15C, the magnetic toner in the sponge 15B is softened by heat conduction from the quartz lamp 15C, and due to its stickiness and affinity, the magnetic toner remaining on the surface of the magnetic recording medium 4 is The toner could be completely transferred to the entire surface of the sponge 15B, and almost no magnetic toner remained on the surface of the magnetic recording medium 4. Therefore, the magnetic toner no longer adheres to the heating resistor element IA, so that even after copying ioo, 000 times, there was still no omission in the image.

The position of the second cleaning device is preferably between the permanent magnet 2 and the heating radar array 1 from the viewpoint of the above-mentioned communication and cleaning characteristics, but is not particularly limited.

〔Effect of the invention〕

According to the above-described cleaning device for a magnetic image forming apparatus according to the present invention, the cleaning device is a small and convenient second cleaning roller that has a built-in heater and a cleaning roll that is located on the outer periphery and has a sponge layer that wipes off residual toner. By adding a cleaning means, it is possible to remove the residual magnetic toner that could not be removed by the first cleaning means in the previous stage, thereby preventing the residual toner from adhering to the heated RAD array and ensuring good images at all times. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional magnetic image forming apparatus, FIG. 2 is an explanatory diagram of the magnetic image forming apparatus of the present invention, and FIG. 3 is a detailed diagram of the auxiliary cleaning device. I] Explanatory diagram. Explanation of symbols 1... Radar array for heating, IA... Heat generating resistor, 2
...Permanent magnet, 3...Permanent magnet, 4...Magnetic recording medium, 5...First cleaning device ff5 s6
...Developer, 7.Recording paper, 8.Transfer device,
9...Fuser, lo...Roll, lJ...Roll, 12...Roll, 13...Roll, 13A...
Nori transfer corotron, 13B... corotron, 14... second cleaning device, 15...
Roll, 15A... Medium dipping vibrator, 15B... Sponge, 15c... Quartz lamp, 16... Backup roll, 17... M) Su-158°゛° residual toner, 19. ··grade. Patent use 17 (Fujize I Cox);, Shiki company agent Patent attorney Shin Matsubara 2 Patent attorney Toki '7: 'I Tsukasa Patent attorney Taira Taira - Same Ben J51±' J=+ Atsushi - Patent Attorney Hitoshi Suzuki Figure 1 (6 Figure 2)

Claims (1)

[Scope of Claims] After magnetizing the magnetic recording medium in a predetermined direction, a magnetic latent image corresponding to image information is created by a heating radar array that heats the magnetized surface and a magnetizing means that magnetizes in a direction opposite to the direction of the magnetic recording medium. A magnetic image forming apparatus for forming an image on a magnetic recording medium includes: a first cleaning means disposed after the transfer means to remove residual toner on the magnetic recording medium; and a first cleaning means for removing residual toner on the magnetic recording medium; A second cleaning device comprising a heater that completely softens the toner remaining on the recording medium, and a cleaning roll that is located on the outer periphery of the heater and includes a sponge layer that comes into contact with the magnetic recording medium and wipes off the softened toner. A cleaning device for a magnetic image forming apparatus, comprising: means.