JPS5910979A - Blade cleaning device - Google Patents

Abstract

PURPOSE:To obtain effective heat insulation from a heat generating source and to eliminate the oscillation noise of a blade and the fusing of recovered toner due to a temperature rise, by providing a heat insulating means to a casing part oppositely to the heat generating source. CONSTITUTION:A heat reflecting plate 50 is provided facing oppositely an eraser lamp 4, and an air layer A1 between the plate and eraser lamp 4 is discharged from a copying machine as shown by an arrow (b) through the opening 53 of a frame 52 after flowing over a frame 52 covering the upper part of a blade cleaning device 10 as shown by an arrow (a) along an air flow formed by a fan 51. Further, a passage 18 communicating with the air layer over the frame 52 is formed on the top surface of a rear chamber S2, and consequently the air A3 heated in the rear chamber S2 by heat radiation from a fixation device 7 regardless of the presence of a heat insulating cover 8 moves to over the frame 52 through the passage 18 as shown by an arrow (d) and mixes with the air layer A1 to flow on along the frame 52, so that the air is discharged from the copying machine.

Description

TECHNICAL FIELD The present invention relates to a blade cleaning device, and more particularly to a blade cleaning device for scraping and collecting residual toner from a photoreceptor of an electrophotographic copying machine.

BACKGROUND TECHNOLOGY Conventionally, in this type of blade cleaning device, a φ located on the circumference of a photoreceptor receives heat radiation from an eraser lamp or the like installed in the vicinity thereof. The blade is usually made of polyurethane rubber, but it thermally expands when heated, causing problems such as vibration and noise when the photoreceptor rotates. According to experiments, it has been confirmed that vibration noise is generated when the ambient temperature is 45° C. or higher.

On the other hand, the melting point of toner is approximately 49°C, and there is a problem in that the collected gutter melts due to the temperature rise of the blade cleaning device, especially those equipped with a toner recovery means for reusing the toner. In this case, it has J3 that induces a functional failure of the toner collecting means.

However, such problems become more noticeable as copying machines themselves become smaller and their parts become more crowded.

H”! The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a blade cleaning device that effectively insulates heat from the heat generation source and eliminates the vibration noise of the blade and the melting of the recovery 1-ner due to temperature rise. It's about doing.

Hereinafter, in order to achieve the purpose of F, the present invention is concerned. The blade cleaning device is characterized in that a heat insulating means is provided in the casing portion facing the heat generation source.

Embodiment FIG. 1 shows a blade cleaning device (1) which is an embodiment.
0) is shown in its installation state along with the surrounding parts (.

The photosensitive drum (1) is rotatable in a counterclockwise direction, and a charger (not shown) is arranged around it.

An image projection device, a developing device and a transfer station, a main blade cleaning device (10), and a -1' laser lamp (4) are installed. Below the blade cleaning device (10) is a copy paper conveyance path C, and adjacent to the transfer charger (2) is a copy paper separation charger (3), I
A tG transport belt (5) and a guide plate (6>) are installed, and a fixing device (7) is installed on the right side.

In this case, the heat generation sources include an eraser lamp (4) (consisting of a halogen lamp) for erasing residual charges on the photoreceptor drum (1) and a fixing device (7). Therefore, the blade cleaning device I (
The heat insulation for 10) deals with heat dissipation from both of them.

Here, the blade cleaning device f(10) will be explained. This device (10) basically consists of a resin outer casing (11) and a blade (3) installed inside the outer casing (11).
0) and a toner collecting means (40), the blade (
The residual toner scraped off from the top of the photosensitive drum (1) in step 30) is returned to the developing device (not shown) as the toner conveying coil (43) rotates.

The outer casing (11) has side plates (20a) and (20b) shown in FIGS. 2 and 3. The side plates (20a>, (20b) function as a casing for the blade cleaning device (10), and also support the support shaft of the photoreceptor drum (1) in the holes (21a), (21b). Photoreceptor drum (
1) and the blade cleaning device [(10) is the side plate (20
a).

(20b) are unitized. Side plate (20a)
Leg pieces (22a) formed on the lower surface of (201)), (2
2b) is for preventing the surface of the photosensitive drum (1) from coming into contact with the floor surface when this unit is removed from the copying machine and placed on the floor.

The blade (30) is made of polyurethane rubber with a thickness of 3 mm and a hardness of 73°, is attached to the blade holder (31), and is installed in the blade holding part U (32). Blade holding part U (32) is external casing (11)
The seedling (Sl) is rotatably installed around the bottle (33) as a fulcrum. The blade holder (31) has a holding portion +4 ( 32) is swingably pivoted about the support screw (34). This is the blade (
This is to uniformly press the tip portion of the photoreceptor drum (1) in the axial direction of the surface of the photoreceptor drum (1). In addition, the holding member (32)
The arm (35) protruding from the opening (13) of the partition wall (13)
14) into the rear chamber (S'2), and this arm (3
5) Bracket 1 fixed to the end and partition By (13)
A coil spring (37) is stretched between (36) and (36). That is, the holding member (32) is biased counterclockwise in FIG. 1 by the coil spring (37) with the bottle (33) as a fulcrum, and this biasing force causes the tip of the blade (30) to The body drum (1) is pressed against the surface of the body drum (1).

In this case, the contact angle of the blade (30) is adjusted to 80°, and the contact force is adjusted to 6.20/n+m2.

The toner collecting means (40) consists of a collecting casing (41) and a toner conveying coil (43).
) has a toner collecting groove (42) extending in the axial direction. The toner transport coil (43) collects toner @(/12
>, and can be rotated by a drive means (not shown). Note that the end of the toner collecting groove (42) communicates with the developing device via a toner conveying tube (not shown), and the 1-toner conveying coil (43) also extends into the toner conveying tube. The opening (23) formed in the side plate (20b) is for leading out the toner conveying tube.

In addition, a flexible nurseal plate (44) is attached to the front surface of the recovery casing (41) and is held in place by metal fittings (45). The tip of this]-ner seal plate (44) is at an acute angle to the surface of the photoreceptor drum (1) (the pressure contact angle is 0°).
~15° is preferred) and the blade (3
This prevents the dirt scraped off the surface of the photoreceptor drum (1) from leaking downward and ensures that the toner collection groove (
42). Furthermore, an optical image area detection means (47) is installed in the lower part of the recovery casing (41) facing the photosensitive drum (1). This detection means (47) consists of a light-emitting element and a light-receiving element, and is for detecting the fuchimaro of the reference 1-no image for I-Luna once control.

On the other hand, as a heat insulating means, the upper surface of the outer casing (11)
That is, a heat reflecting plate (
50), and the air layer (A1) interposed between the heat reflecting plate (50) and the eraser lamp (4) is discharged to the outside of the copying machine by a fan (51). The heat reflecting plate (50) is made of aluminum, for example, and is made of aluminum, and is made of aluminum, and is made of aluminum, and is made of aluminum, and is made of aluminum, and is made of aluminum.
15) There is a fence between the two. The air layer (A2) formed between the outer casing (11) and the outer casing (11) also contributes to improving the heat insulation effect. The air layer (A1) is formed along the air flow formed by the fan (51) as indicated by the arrow (a).
It flows through the frame (52) 1- provided to cover the upper part of the blade cleaning device (10) as shown in FIG.
It is ejected from the copying machine.

On the other hand, the fan (51) also serves as a means for forming an air flow to cope with heat radiation of the fixing device (7). That is, heat radiation from the constant @ device (7) also occurs from the opening (9) on the inlet side of the copy paper, and heat is generated from the air layer (A3) near the opening (9). Therefore, a passage (18) communicating with the upper air layer of the frame (52) was formed on the upper surface of the rear chamber (S2). As a result, due to the suction action of the fan (51), the air inside the rear chamber (82), which is heated by the heat radiated from the fixing device (7) despite the presence of the heat insulating cover (8), is removed as shown by the arrow (d). As shown, the air passes through the passageway (18) and reaches above the frame (52), after which it merges with the air layer (A1), flows along the frame (52), and is discharged to the outside of the copying machine.

In order to improve cooling efficiency in the rear chamber (S2), as shown in FIG. is formed. As a result, the air flowing in from the opening (2/l) crosses the inside of the rear chamber (32), and the efficiency of the cold month 1 is improved.

Moreover, the air in the chamber (Sl) of the outer casing (11),
In particular, the air layer (A4) near the blade (30) is also slightly heated. This air M (A4) is also a fan (51)
arrow (e).

As shown in (f), the opening (14
) flows into the rear chamber (S2), merges with the air flow, and is finally discharged outside the copying machine.

Next, the toner leakage prevention means will be described in detail.

That is, in this embodiment, the air inside and outside the blade cleaning device (10) is pumped to the outside of the copying machine by the fan (51).
1, it is necessary to reliably prevent leakage of toner from the blade cleaning device (10) in order to prevent pollution. Particularly, sealing is required in the space (S3) formed by the toner collecting means (40) and the blade (30), and on both sides of the trap.

Therefore, as shown in FIGS. 2 to 4, seal plates (
25).

(27) is attached. The seal plate (25) is made of polyurethane foam, and a polyester film (26) with a thickness of 0.In+m is pasted on the surface, and the photoreceptor drum (25) is made of polyurethane foam.
1) Seal this part by coming into close contact with the side part.

The seal plate (27) is also made of polyurethane foam with a thickness of 3IllII+, and the side part of the blade (30) is
．． 4~I, Omm culm food 0 included J, Closely contact the sea urchin and seal this part. In addition, the blade (3) is attached to the seal plate (27).
The side of 0) is 1. The reason why the blade (30) is allowed to dig in by about 0.0 mm is because the blade (30) moves in the drum axis direction with an amplitude of 0.6 mm in conjunction with the rotation of the photoreceptor drum (1). This movement is done in order to prevent vibration noise caused by the rotation of the photoreceptor drum (1) if only the blade (30) is fixedly pressed against the photoreceptor drum (1). The means for interlocking with the rotation of the photoreceptor drum (1) is a well-known structure using a cam. In addition, the side of the photoreceptor drum (1) is equipped with a seal plate (
27) is also contacted and sealed.

Further, the L part of the space (S3) is sealed by the blade (30), the lower part is sealed by the toner seal plate (44), and the back part is sealed by the seal plate (46) protruding from the collection casing (41). The tip of the plate (30) is sealed by contacting the lower surface of the plate (30), and the space (S3) is connected to the rear chamber (S2).
This prevents the pressure from decreasing.

In the following configuration, the heat radiation of the Ireli lamp (lI) is blocked by the air layer (A1) sucked by the heat reflection plate (50) and the fan (51), and the heat radiation of the fixing device (7) is blocked by the fan (51). 51) sucked by IZI (24
) is blocked by the cold 711 airflow from the blade cleaning device (10), thereby preventing the temperature rise of the blade cleaning device (10). Therefore,
Problems such as vibration noise of the blade (30) and melting of collected toner caused by dry hands do not occur. As in this embodiment, one fan (51) is provided to deal with heat dissipation between the Ireli lamp (4) and the fixing device (7).
By suctioning the heated air 1, it is possible to eliminate the space loss of installing dedicated fans for each, which is particularly effective for small-sized copying machines.

In addition, the toner scraped off the surface of the photoreceptor drum (1) turns into powder smoke in the space (S3), but as it is sealed as mentioned above, it will not leak to other parts inside the copying machine or outside the copying machine. There is no.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be variously modified within the scope of the gist thereof. For example, asbestos or the like, which functions as a heat insulating material, may be used instead of the heat reflecting plate (50).

As is clear from the above description, the present invention provides a heat insulating means in the casing portion facing the heat generation source, so that the increase in the temperature inside the blade cleaning device is prevented.
The vibration noise of the blade due to thermal expansion and the melting of recovery 1 to Boo are reliably prevented by 1).

[Brief explanation of drawings]

The drawings show an embodiment of the blade cleaning device according to the present invention, and FIG. 1 is a sectional view of the blade cleaning device installed in a copying machine, FIGS. 2 and 3 are front views of the side plate, and FIG. FIG. 5 is a partial sectional view illustrating the side seal state, and a vertical sectional view of the rear chamber of the outer casing. (A1), <A2), (A3), (A4>... Air layer, ( Sl)...chamber, (S2)...rear chamber, (S3)
...Space part, (1)...Photoconductor drum, (4)...
・Eraser lamp, (7)...Fixing device, (10)・
...Blade cleaning device, (11)...External casing, (30)...Blade, (50)...Heat reflector, (51)...Fan, (52)...Frame.

Claims (1)

[Scope of Claims] 1. A blade cleaning device installed near a heat generation source, characterized in that a heat insulating means is provided in a casing facing the heat generation source. 2. The blade cleaning device according to claim 1, wherein the heat insulating means is a heat reflecting plate. 3. The blade cleaning device according to claim 1, wherein the heat insulating means is an air layer that can be exhausted to the outside by a suction device.