JPH0721682B2 - Cleaning device for recording medium in magnetic printing device - Google Patents

Description

The present invention relates to a recording medium cleaning device for a magnetic printing apparatus, and more specifically, it cannot be removed by a conventional recording medium cleaning device. The present invention relates to a recording medium cleaning device capable of removing fine particles attached to a recording medium.

[Prior Art and Problems to be Solved by the Invention] Recording medium, for example, characters to be printed by a magnetic recording head provided facing a rotating magnetic drum having a magnetic layer coated thereon There is already known a magnetic printing apparatus which magnetically forms a latent image on a magnetic recording medium, adheres colored resin powder, which is a developing medium according to the latent image pattern, so-called toner, and prints on a predetermined sheet. In such a magnetic printing apparatus, in order to maintain the printing quality of the next cycle, it is necessary to remove the toner remaining on the surface of the rotating magnetic drum after printing.

As a conventional cleaning device for removing the toner remaining on the surface of the magnetic drum, a cleaning device is installed between the printing unit and the magnetic head.
A cleaning device using an elastic blade or the like is known. That is, the residual adhered toner is intended to be removed by a plate or the like before the residual adhered toner reaches the magnetic head.

However, when forming a latent image, the magnetic drum rotates at high speed, for example
It is rotating at 4000 RPM, and it is necessary to separate the blade from the surface of the magnetic drum by a predetermined distance so as not to be damaged by the blade of the magnetic layer on the surface of the magnetic drum during such high speed rotation. For this reason, there are cases where fine toner particles and the like remain attached to the surface of the magnetic drum.

On the other hand, the magnetic drum surface and the magnetic head are opposed to each other at a narrow interval of several μm or less, and minute toner particles or the like that cannot be removed by the cleaning device may adhere to the magnetic head. The fine particles adhered to the magnetic head tend to substantially increase the magnetic distance between the magnetic head and the surface of the magnetic drum, and as a result, good latent image formation cannot be ensured and the reliability of printing is reduced. There is a problem of being damaged.

Therefore, there is a demand for a cleaning device for a magnetic printing device that can remove even minute adhered particles at least during latent image recording without damaging the surface of the magnetic drum.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a cleaning device in which the tip of a plate-like elastic member is covered with a wiping member. The cleaning device is slidably contacted with the magnetic drum by the elasticity of the elastic member. Before the recording head scans the magnetic drum to form a magnetic latent image, the surface of the magnetic drum is wiped for cleaning.

[Operation] The cleaning member of the cleaning device of the present invention rubs against the recording medium with an elastic force that does not damage the recording medium, and minute residual adhered developing medium and drum surface that cannot be completely removed by the conventional cleaning device. It also removes fine powder that has been scraped off and dust that has adhered for some reason.

The cleaning device of the present invention removes the developing medium at least before the printing pattern forming means faces the recording medium at the time of forming the magnetic latent image.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic sectional side view of a magnetic printing apparatus equipped with a cleaning device according to the present invention.

In FIG. 1, the magnetic printing apparatus has a magnetic (recording) drum 1 as a recording medium which is coated with a magnetic layer and rotates in a direction of an arrow A, and a predetermined image is formed on the magnetic layer of the recording drum 1. A magnetic recording head 2 as a printing pattern forming means which is arranged opposite to each other with a space between them, a developing machine 12 for adhering and developing toner 24 as a developing medium on the surface of the magnetic drum 1 on which a latent image is formed, Cleaning blade 1 for removing the toner remaining after transfer by the transfer roll 5 from the surface of the magnetic drum 1.
4, a cleaning unit 15 for vacuum-sucking the toner particles removed by the cleaning blade, and an erasing head 13. The above-mentioned members are the same as conventional ones, and the cleaning blade 14 and the cleaning unit 15
And called a conventional cleaning device.

Since only the first cleaning device causes the above-mentioned problem, the second cleaning device 6 is further provided in the present invention. The second cleaning device 6 will be described later with reference to FIGS. 2 (a) and 2 (b).

The recording head 2 and the second cleaning device 6 are integrally attached to the sub-scan table 23, and the sub-scan table 23 has a parallel shaft 51 and
It travels in parallel with the surface of the magnetic drum 1 by using 52 as a guide, in other words, perpendicularly to the paper surface of FIG.

In the process of forming a magnetic latent image, the magnetic drum 1 rotates at a high speed, for example, 4000 PRM in the direction of arrow A. In this state, the sub-scan table 23 is moved in the direction B by the wire 53 along the axes 51 and 52, and during this traveling, the recording head 2 on the sub-scan table 23 is magnetized according to a desired printing pattern. A magnetic latent image is formed on the drum 1.

When the latent image forming process is completed, the sub-scanning table 23 is returned to the starting point position toward the side plate 80 by the wire 53.

The recording head 2 approaches the magnetic drum 1 at the time of latent image formation by the head access mechanism 24 (details) (the magnetic drum 1
, The recording head 2 floats above the magnetic drum 1 with a gap of several microns due to the air flow.) When the latent image formation is completed, the recording head 2 separates from the magnetic drum 1.

When the latent image formation is completed, the magnetic drum 1 rotates at a low speed, for example,
Move to 100PRM. The recording paper 99a or 99b (hereinafter referred to as 99) on the paper feed table 7 or 8 is sent out by the paper feed roller 21 or 22, and the paper is synchronized with the magnetic drum 1 by the timing roller pair 9a, 9b or 10a, 10b. Feed roller pair 28a, 28b
Sent to. On the other hand, the developing machine 12 is moved up to a predetermined developing position toward the surface of the magnetic drum 1 by a cam (not shown), and developing is carried out with the toner 24. The recording paper 99 is pressed against the magnetic drum 1 by the transfer roller 5 operated by the solenoid 11, and the toner image is transferred. Then peeling belt 3
Is separated from the magnetic drum 1 by the conveyor belt 16 and is guided to the fixing roller pair 17a, 17b by the conveyor belt 16 and the fixing roller pair 17a, 17b.
It is fixed by 7b. After that, they are separated by the separation claws 18a and 18b, and are discharged to the paper discharge tray 20 by the paper discharge roller pair 19a and 19b.

The toner remaining on the magnetic drum 1 without being transferred is scraped off by the cleaning blade 14 of the first cleaning device.
It is vacuumed at 15 and collected in a filter bag (not shown). Due to this, the fine particle toner that is not removed and remains adhered is removed by the second cleaning device 6 at the time of forming the next magnetic latent image.

To obtain a large number of copies, the latent image recording is performed once, and then the steps of developing, transferring, fixing, and cleaning by the main cleaning device are repeated.

2 (a) is a side view of the peripheral portion of the cleaning device 6 according to the present invention, and FIG. 2 (b) is a plan view. Fig. 2 (a)
The support plate 70 of the cleaning device 6 is screwed to the left end of the sub-scanning base (23) of
It's stopped at 71. The support plate 71 is L-shaped and has screws.
Cleaning device 6 is fastened at 72. The cleaning device 6 comprises a plate-like elastic member 61 (for example, a thickness of 2 mm) such as fluororubber or urethane rubber, which is covered at its tip with a wiping member 62 made of deer skin, non-woven fabric, artificial leather or the like. The part fastened with screws 72 is a hard chair such as stainless steel, iron, aluminum or plastic.
63 and 64 are pasted. The role of these thin plates 63, 64 is screws
When the cleaning device is fastened to the support plate 70 at 72, it prevents the relatively soft elastic member 61 such as rubber from being deformed and becoming difficult to fasten. FIGS. 3A and 3B show the cleaning device 6 before it is mounted on the machine. FIG. 3 (a) is a side view, FIG.
Figure (b) is a plan view. The elastic member 61 is flat before being mounted on the machine as shown in FIG. 3 (a), but when mounted on the machine as shown in FIG. 2 (a), the drum 1
It is pressed against and bends. Due to the bending, an appropriate spring pressure is generated, and the wiping member 62 wipes the drum 1 while pressing it with an appropriate pressure, so that a cleaning action is generated. Figure 3 (b)
65 and 66 are notches through which the screw 72 passes. The reason why the screw hole is cut out is that the screw is used when the cleaning device 6 is replaced.
This is because the 72 can be easily replaced by loosening it without removing it. In the process of magnetic latent image formation,
The wiping members 62 (62a, 62b) of the cleaning device 6 mounted together with the recording head 2 on the sub-scan table 23 also slide on the surface of the magnetic drum 1 at the same time. The rubbing of the wiping member 62a is shown in FIG.
Since the magnetic latent image is formed before the recording head 2 faces the surface of the magnetic drum 1, the magnetic latent image is formed on the clean surface from which the fine particles adhering to the surface of the magnetic drum 1 have been removed by the wiping member 62, and the recording head No fine particles are attached to 2. Before the main cleaning device 6 was provided, the gap between the recording head 2 and the drum 1 was partially increased due to the particles adhering to the surface of the drum 1, and there were cases where recording was omitted or light recording was performed. By mounting the cleaning device 6, this problem has been solved, and it has become possible to always perform good latent image recording on the entire surface.

As shown in FIGS. 2 (b) and 3 (b), the wiping member 62 is attached to both sides of the recording head 2 (62a, 62b). As described above, 62a cleans the surface of the magnetic drum 1 when the recording head scans the drum. 62b will be cleaned later. When the recording head 2 returns to the recording start point, 62
b cleans before 62a. FIG. 4 shows an embodiment of only 62a without 62b. In the case of only 62a, as shown in FIG. 2B, the region c on the magnetic drum 1 is not cleaned by the wiping member 62. Provide 62b for complete cleaning c
It is preferable to also clean the area shown by. Further, the cleaning effect is enhanced because the double cleaning is performed by 62a and 62b.

As shown in FIG. 4, in the case of 62a only, the recording head 2 returns to the position to the right of the right end of the recording drum 1, and the wiping member 62a
Preferably wipes the entire area of the magnetic drum 1 (including the area c).

5 (a) to 5 (d) show various modifications other than the embodiment shown in FIGS. 5 (a) and 5 (b) are elastic members.
An example is shown in which 61 is a thin metal plate such as stainless steel or phosphor bronze (thickness is 0.1 to 0.2 mm). In this case, a stronger pressing force can be obtained than when a rubber elastic member is used. Further, unlike the rubber shown in FIGS. 2 to 3, the elastic member 61 does not require the reinforcing members 63 and 64 for screwing. In (c), the elastic member has a sandwich structure of a metal thin plate 61a, rubber 61b, and metal thin plate 61c. In the case of an elastic member made of a metal thin plate as shown in (a) and (b), vibration of the drum 1 may be transmitted to the head 2 and adversely affected unless a proper shape is selected. The rubber 61b serves to absorb vibration. (D) is the one shown in FIGS. 2 and 3 from which the reinforcing members 63, 64 for screwing are removed. In FIGS. 2, 3 and 5 (d), the elastic member 61 is made of rubber having good vibration absorption.

6A and 6B show the position of the cleaning device 6 in the recording head 2
It is an example that came above.

Although the cleaning device 6 is always in sliding contact with the magnetic drum 1, the cleaning device 6 may access the drum 1 in conjunction with the access of the recording head 2.

Further, in the above-mentioned embodiment, the magnetic printing apparatus for scanning one recording head 2 is illustrated, but a magnetic printing apparatus in which a large number of recording heads are provided in the axial direction of the magnetic drum and the sub-scanning mechanism is eliminated. In this case, the cleaning member is also formed so as to cover the entire width of the recording drum.

[Effects of the Invention] As described above, according to the present invention, the cleaning device wipes the drum prior to the formation of the latent image on the recording head. It is possible to form a latent image and, in turn, print with good quality.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a magnetic printing apparatus equipped with the cleaning device of the present invention, FIG. 2 (a) is a schematic side view of the periphery including the cleaning device of the present invention, (b) is a plan view, and FIG. Figure (a) is a side view of the cleaning device, (b) is a plan view, and Figures 4, 5, and 6 are other embodiments. 1 ... Magnetic drum, 2 ... Recording head, 6 ... Cleaning device, 61 ... Elastic member, 62 ... Wiping member

Claims (1)

[Claims] 1. Cleaning means having a tip end of a plate-like elastic member covered with a wiping member is provided on both sides of the recording head and is supported by the sub-scanning table together with the recording head, and the wiping member is elastic of the elastic member. Is slidably contacted on the magnetic drum by pressing by the recording head, moves along with the recording head on the magnetic drum in accordance with the sub-scan of the recording head, and one of the cleaning means provided on both sides of the recording head precedes the recording head. A cleaning device for a magnetic printing apparatus, characterized in that the cleaning is performed by wiping the surface of the magnetic drum.