JPH08234644A - Cleaning brush device for electrophotographic printer - Google Patents

Abstract

PURPOSE: To prevent fluctuations in a load from a printing paper during travel ing from affecting a tractor by adjusting the pressing force of cleaning brushes cleaning the printing paper to the desired pressing force. CONSTITUTION: The cleaning brushes 2 and 3 cleaning the printing paper 1 in the front stage of the tractor 4 for carrying the printing paper 1 to a photoreceptor drum 5 are constituted to face each other. The cleaning brush 3 can be rotated by a pin 19 supported by a holder 17 on both ends and fixed on an arm 18. The load Pu for adjusting the pressing force Po by the gravity of the cleaning brush 3 is added to the lower part of the arm 18, in such a manner that a spring for pushing up 21 is interposed as a pressing force adjusting member. The load Pu is set to obtain the desired brush pressing force by a change in a spring constant. A shaft 22 is slidably supported by the holder 17 on one end, to prevent the buckling of the spring 21 and butted against the arm 18 of the cleaning brush 3 on the other end, to impart the pushing up force of the spring 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning brush device for an electrophotographic printer or the like which uses continuous paper as a printing paper.

[0002]

2. Description of the Related Art A printing paper loaded in a printer is conveyed to a photosensitive drum by a tractor having a conveying pin on the outer periphery of a belt, a toner image is drawn on the surface facing the photosensitive drum, and then the tractor is applied from the photosensitive drum surface. The toner image is conveyed to the fixing unit, and heat and heat pressure are applied in the fixing unit to fix the toner image.

Since the gap when the printing papers are opposed to each other on the surface of the photosensitive drum is a certain narrow gap in consideration of transferability, a punching hole of the paper itself or other foreign matter is formed on the printing paper surface. If these are larger than the above gap, the photosensitive drum may be damaged, or if they enter the high voltage part that charges the printing paper, it may cause a trouble such as high voltage leak. .

Therefore, in general, a brush is arranged so as to come into contact with the printing paper with a certain pressure in order to clean the printing paper in advance at the position before the printing paper is carried into the photosensitive drum. ing.

The pressing load of the brush in contact with the printing paper is determined by the weight of the brush itself, the weight of the mounting parts, the mounting conditions, etc., but the paper being printed and running continues to be affected by the brush pressing load. The brush pressing load suddenly becomes a high load when it collides with the fold perforations (convex parts) of the printing paper, and suddenly becomes a low load when it enters the valleys (concave parts). As a result, load fluctuations are given and the transport force at the tractor becomes unstable.

The instability of the transport force of the tractor during traveling can be absorbed by the margin between the printing paper and the tractor in a printer having a relatively slow printing speed, but as the printer becomes faster, Since it becomes difficult to absorb the instability of the conveyance force of the printing paper, there is a high possibility that the printing paper may come off the pin of the conveyance belt of the tractor or cause another traveling trouble during traveling.

[0007]

As described above, in the conventional printer, the cleaning brush arranged in front of the tractor for conveying the printing paper has a high possibility of destabilizing the conveying force of the tractor. There is also a limit to the carrying capacity to carry and structural changes have been forced.

An object of the present invention is to eliminate the above-mentioned drawbacks and to allow a tractor to stably run a sheet, by using a cleaning brush arranged in the preceding stage of the tractor to prevent the load fluctuation from the printing sheet being run to the tractor. It is to devise a cleaning brush device such as an electrophotographic printer so as not to give it.

[0009]

SUMMARY OF THE INVENTION The above-mentioned object is to prevent a load variation due to the printing paper on the cleaning brush arranged in front of the tractor for conveying the printing paper, and reduce the load near the cleaning brush mounting portion. This is achieved by constructing and combining a pressure adjusting member that pushes up the cleaning brush so as to adjust the pressing force to an appropriate value.

[0010]

The cleaning brush arranged in front of the tractor for conveying the printing paper is provided with a spring as a pressure adjusting member for pushing up against the brush pressing load to adjust the brush pressing load.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of the printer, and FIG. 2 is a side view of the cleaning brush device according to the present invention. In FIG. 1, the printing paper 1 is conveyed in the direction a by the tractor 4 and a latent image of toner is drawn from the photosensitive drum 5 at the facing portion b by the electrophotographic method, then conveyed by the tractor 8 and heated by the preheating plate 10. Is applied, heat pressure is applied between the heat roller 11 and the idle roller 12, fixing is completed, and the sheet is sent into the stacker by the conveying roller 13 facing the sheet, and is distributed in the direction of the folding perforations of the printing paper 1. Paddles 1 facing each other
5, 16 are loaded on the table 14.

[0012] Here, there are cases where punching dust, dust, and the like in the feed holes are attached to the printing paper 1 when the printing paper 1 is processed or running, and when it is conveyed to the facing portion b in this state, The facing portion b is generally set to have a narrow gap in order to facilitate toner transferability. Therefore, the photosensitive drum 5 may be damaged or a printer failure such as a transfer failure may occur depending on the size of the punched residue. It may cause it.

In order to solve the above problems, the cleaning brushes 2 and 3 for cleaning the printing paper 1 are made to face each other before the tractor for carrying the printing paper onto the photosensitive drum. Figure 2
The cleaning brush 3 is rotatably fixed to the arm 18 by a pin 19 whose both ends are supported by a holder 17. A load Pu for adjusting the pressing force Po due to the weight of the cleaning brush 3 is added to the lower portion of the arm 18 by interposing a lifting spring 21 as a pressing adjustment member. The load Pu changes the spring constant to obtain a desired brush pressing force. The shaft 22 has one end slidably supported by the holder 17 to prevent the spring 21 from buckling, and the other end is abutted against the arm 18 of the cleaning brush 3 to give a pushing force to the spring 21. . The ring 23 is for preventing the shaft 22 from coming off.

According to this structure, it is possible to suppress the load fluctuation on the printing paper and set an appropriate pressing load of the cleaning brush 3 according to the printing speed.
It is possible to reduce a problem in traveling such as the printing paper coming off from.

[0015]

As described above, according to the present invention, the pressing force of the cleaning brush for cleaning the printing paper can be adjusted to a desired pressing force so as to optimize the load fluctuation applied to the printing paper according to the printing speed while the paper is running. Therefore, it becomes possible to reduce the traveling trouble such as the detachment of the printing paper on the tractor. Further, application of the paper cleaning brush to a high speed printer can be realized easily and easily.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a cleaning brush device of an electrophotographic printer according to the present invention.

FIG. 2 is an enlarged side view of the cleaning brush device of FIG.

[Explanation of symbols]

1 is a printing paper, 2 is a cleaning brush, 4 is a tractor, 5
Is a photosensitive drum, 17 is a holder, 18 is an arm, 19 is a shaft, and 21 is a spring.

Claims (1)

[Claims] 1. An electrophotographic printer, comprising: a continuous paper as a printing paper; and a cleaning brush for cleaning the printing paper and removing static electricity at a position in front of a transfer section. A cleaning brush device for an electrophotographic printer, wherein a pressure adjusting member for adjusting the pressure is provided on the cleaning brush.