JPH0328452Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cleaning device for sucking and collecting excess toner on a drum of a copying machine or the like.

2. Description of the Related Art Conventionally, there is a toner suction device as shown in FIG. 1 as a cleaning device for cleaning the surface of a drum of a copying machine by sucking excess toner thereon.
(See Utility Application No. 57-76881). In this toner suction device, excess toner (not shown) on the recording drum 1 is scraped off by the toner scraping blade 2, and at the same time, the toner suction device 3 carries it on the air flow inside the device and passes it through the pipe 6. It is collected by suction through the At this time, the air flow inside the suction device 3 moves as shown in FIG. 2, and the air flow 5 rotates inside the suction device 3 while going out of the device, so that the toner 4 that has flown up will be returned again. Toner may fall onto the recording drum 1, scraping blade 2, or inside the suction device 3, or if the toner suction device is enlarged to increase the copy size, the internal airflow may be disturbed, making toner collection difficult. It had the disadvantage of becoming. If the cleaning action is incomplete, for example, in a magnetic copying machine, a problem arises in that toner is caught between the recording head and the recording drum, thereby hindering latent image recording.

Purpose of the invention The present invention was made to solve the problems of the conventional technology as described above, and its purpose is to improve the efficiency of collecting excess toner on the drum. The object of the present invention is to provide an applicable cleaning device.

Structure of the Invention In order to achieve the above-mentioned object, the present invention uses a cleaning device such as a copying machine that has a toner scraping blade, a toner suction section, and a toner collection section. The toner suction section is narrowed and both longitudinal ends thereof are opened, and a passageway through which airflow is guided toward the toner collection section is connected to approximately the center of the toner suction section in the longitudinal direction, and the toner suction section is configured to scrape off toner from the opening section. A cleaning device for a copying machine or the like is provided in which gaps are formed between the tip of the blade side and the tip of the toner scraping blade, and between the tip on the other side of the opening and the recording drum.

Embodiments Examples of the present invention will be described below with reference to the drawings.

3 to 7 show an embodiment of the present invention.

In FIG. 3, 1 is a recording drum, 2a is a toner scraping blade, 2b, 2c, 2d are scraping blade mounting rods, 3 is a toner suction device, 3a, 3
b is a tip plate forming an opening on the toner scraping blade 2a side of the toner suction device 3;
is a tip plate on the side of the toner scraping blade 2a, and 3b is a tip plate on the opposite side, and the tips of these two tip plates 3a and 3b are close to each other, so that the tip plate on the side of the toner scraping blade 2a of the toner suction device 3 is The opening has a constricted shape (Figure 4).
3c is a pipe connecting the opening on the other side of the toner suction device and the toner recovery device 6 (FIG. 4). The toner suction device 3 is further opened at both ends in the longitudinal direction, and is provided with openings 3d and 3d'.

In FIG. 4, the remaining toner after transfer on the recording drum 1 rotating in the direction of the arrow 8, that is, the excess toner 4, is scraped off by the scraping blade 2a, and then transferred to the suction tip plates 3a, 3b and the recording drum. Air flows flowing from gaps 5a, 5b with 1 and air flows 5c, 5d flowing from both side end openings 3d, 3d'
(FIG. 5), the toner is sucked into the toner suction device 3 and collected by the filter 6a in the toner collection device 6 via the pipe 3c. Note that 6b is a suction blower.

FIG. 5 shows the air flow inside this toner suction device 3 viewed from the front, and the air flows 5a and 5b flowing in from the gap between the recording drum 1 and the suction tip plates 3a and 3b are connected to the openings on both end faces. The air quickly moves to the center of the suction device 3 on the airflows 5c and 5d flowing from the sections 3d and 3d'. At this time, the toner 4 is carried along with the air flow.

FIG. 6 is an enlarged view of a part of FIG. 4, showing the movement of the toner 4, the air flow 5a around the suction tip plate 3a on the side of the toner scraping plate 2a, and the suction tip plate 3b on the opposite side. The airflow around the airflow 5b is illustrated in more detail. The figure shows a specific example in which good results were obtained through experiments. The gap A between the tip of the suction tip plate 3a and the recording drum 1 is 1.2 mm, and the gap A between the tip of the other suction tip plate 3b and the recording drum 1 is 1.2 mm. Gap B
0.5 mm, the width C of the opening on the toner scraping blade 2a side of the toner suction device 3 is 5.5 mm, the width D of the opening on the opposite side is 23 to 27 mm, and the distance E between both openings.
30 to 36 mm, and the toner scraping blade 2
The angle α formed by the suction tip plate 3a and the normal line 10 at the point of contact between a and the recording drum 1 is set to α>0. Further, good results were obtained when the tip of the suction tip plate 3a was positioned approximately on the normal line 10 or on the right side of the normal line 10.

FIG. 7 shows a state in which a latent image is being recorded on the recording drum 1, and the scraping blade 2a moves the connecting plate 2e by suction from the latching solenoid 15 (a solenoid that maintains its state even when electricity is cut off). The blade is rotated clockwise around the blade shaft 2d, separated from the recording drum 1, and comes into contact with the suction tip plate 3a. The latching solenoid 15 operates and connects the connecting plate 2.
When the sensor 2f detects this, the recording head 11 records a latent image on the recording drum 1. At this time as well, the waste, toner, etc. floating due to the rotation of the recording drum 1 are smoothly sucked along the suction tip plate 3a together with the air flow 5b, and the waste, toner, etc. do not reach the recording head 11. Latent image recording is not obstructed. At this time, the developing device 12 and the transfer roller 13 are separated from the recording drum 1. When recording is completed, the suction of the latching solenoid 15 is released, and the connecting plate 2e is moved by the spring 2g.
The scraping blade 2a comes into contact with the recording drum 1 as it moves counterclockwise. Also, the connecting plate 2e
The sensor 2f senses the movement, and the copying operation begins. During the copying operation, the developing device 12 approaches the recording drum 1, and the transfer roller 13 sandwiches the recording paper 16 and comes into contact with the recording drum 1, thereby performing developing and transferring operations. The developed image is transferred by a transfer roller 13 to a recording paper 16 that has passed through a paper path 14. The toner remaining on the recording drum 1 after the transfer is scraped off by the scraping blade 2a and simultaneously sucked by the suction device 3 as described above. The sensor 2f is, for example, a photo interrupter, and detects that the scraping blade 2a is away from the recording drum 1 when the connecting plate 2e blocks the light, and when the connecting plate 2e does not block the light, the scraping blade 2a detects that the scraping blade 2a is away from the recording drum 1. is recording drum 1
senses that it is in contact with the The sensor 2f and the solenoid 15 are connected to a control device 20 consisting of a microprocessor and its peripheral devices. The control device 20 is of course connected to other mechanisms, such as the recording drum 1, the developer 12, the transfer roll 13, the blower 6b, etc., and an operation panel (not shown).
Controls the operation of the mechanism based on the operation panel and sensor information. The latching solenoid 15 is particularly effective in protecting the recording drum 1 or the scraping blade 2a when the power is cut off due to a power failure or the like during latent image recording. That is, the latching solenoid 15
serves to separate the scraping blade 2a from the recording drum 1 during recording of a latent image, but it remains in that state even when the power is suddenly cut off, so it can be used even when the recording drum 1 is rotating at high speed (for example, 4000 rpm). pm), the scraping blade 2a does not come into contact with this. During the copy operation, the recording drum 1 rotates at a low speed (for example,
100 rpm) and is in contact with the scraping blade 2a, but if they come into contact during high-speed rotation, there is a risk that both will accelerate wear.

With the above structure, as shown in FIG.
As it moves (in the rotational direction of arrow 8), it passes under the suction tip plate 3b and is scraped off by the scraping blade 2a, and at the same time, due to the high-speed air flow at the tip due to the opening tip of the suction device 3 being narrowed. It is lifted up and is suctioned and collected more quickly and reliably. In this case, as mentioned above, the gap A (1.2 mm) between the suction tip plate 3a and the recording drum 1 is larger than the gap B (0.5 mm) between the suction tip plate 3b and the recording drum 1, so the space directly above the scraping blade 2a is The airflow 5a is large and increases the effect of blowing up the toner 4. Further, by setting the mounting angle α of the suction tip plate 3a such that α>0, the air flow 5a quickly and reliably blows up the toner 4 at the tip of the scraping blade 2a.

In this way, the excess toner scraped off by the scraping blade 2a can be collected more quickly and reliably.

This example was published in Japanese Patent Application No. 121805/1984 (Japanese Patent Application No.
The specifications when applied to a magnetic duplicating machine (see Publication No. 48779) were as follows.

Drum peripheral speed 45cm/sec Drum diameter 86φ Drum length 388mm Suction blower Voltage 100V Frequency 50Hz Current 1.2A Power consumption 150W Maximum air volume 7000/min Maximum wind pressure 33mm/
H ₂ O Effects of the invention Since the invention has the above-described structure and function, it is possible to increase the efficiency of suction and collection of excess toner on the drum, and to perform sufficient cleaning of the drum. Therefore, toner is prevented from remaining on the drum and interfering with latent image recording by the recording head, and therefore, an effective cleaning device can be obtained when applied to copying machines and the like.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional toner suction device, Figure 2 is a perspective view of a conventional toner suction device;
Figure 3 is an enlarged perspective view of the inside of the same device, Figure 3 is an overall perspective view of an embodiment of the present invention, Figure 4 is an enlarged side sectional view of the main parts of the same embodiment, and Figure 5 is an enlarged view of the main parts of the same. 6 is an enlarged view of the main part of Fig. 4, and Fig. 7 is an enlarged side sectional view of the main part similar to Fig. 4 of the same embodiment, but shows a different usage state from the same figure. It is something. 1... Recording drum, 2a... Toner scraping blade, 3... Toner suction device, 3a... Scraping blade side tip plate, 3c, 3d, 3d'... Opening, 4... Toner, 5a, 5b ...Gap, 6...
Toner recovery device, 11...recording head, 12...
Developing device, 13...Transfer roller.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a cleaning device such as a copying machine that has a toner scraping blade, a toner suction part, and a toner collection part, the toner scraping blade side opening of the toner suction part is narrowed and its longitudinal direction Both ends of the toner suction section are open, and a passageway through which airflow is guided toward the toner collection section is connected to the approximately central portion of the toner suction section in the longitudinal direction. A cleaning device for a copying machine or the like, characterized in that a gap is formed between the tips of the toner scraping blade and between the tip on the other side of the opening and the recording drum. 2. The tip of the toner scraping blade side of the toner scraping blade side opening of the toner suction section has its tip on the normal line to the contact point between the recording drum and the scraping blade or on the drum. A cleaning device for a copying machine or the like according to claim 1, which is located on the rotational direction side of the drum and is inclined toward the drum rotational direction with respect to the normal line.