JPH055582Y2 - - 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 in order to solve the problems of the prior art as described above, and its purpose is to eliminate waste and toner that floats even during latent image recording in copiers, etc. To provide a cleaning device for a copying machine, etc., which does not interfere with latent image recording and copying by suctioning the toner to prevent it from reaching the recording head, and by scraping off excess toner on the recording drum during copying and at the same time suctioning the toner. It's about doing.

Structure of the Invention In order to achieve the above object, the present invention includes a toner scraping blade, a toner suction device having an opening close to the recording drum, and a toner scraping blade that contacts and separates from the recording drum. In a cleaning device such as a copying machine equipped with a blade operating mechanism, the toner scraping blade comes into contact with the recording drum during copying, and the tip of the toner scraping blade side of the opening of the toner suction device contacts the recording drum. During recording of a latent image, it is spaced apart from the recording drum and comes into contact with the tip of the blade side to close the gap through which the air flows. The gap between the tip of the scraping blade and the recording drum is larger than the gap between the tip of the opening on the opposite side of the toner scraping blade and the recording drum, and the gap is larger in the longitudinal direction of the toner suction device. a latching solenoid, the actuating mechanism of which is connected to the toner scraping blade; a sensor that detects the actuation of the latching solenoid; and a control device connected to the latching solenoid.

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 recording drum 1 side of the toner suction device 3; 3a is a tip plate on the side of the toner scraping blade 2a; and 3b is a tip plate on the opposite side; The protruding ends of 3a and 3b are close to each other, so that the toner suction device 3
The opening on the side of the recording drum 1 has a constricted shape (FIG. 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 provided with openings 3d and 3d' at both end faces in the longitudinal direction.

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 the gaps 5a, 5b between the two ends and air flows 5c, 5d flowing from the openings 3d, 3d' on both sides.
(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 on both side end surfaces. The air quickly moves to the center of the suction device 3 on the airflows 5c and 5d flowing from the openings 3d and 3d'. At this time, the toner 4 is selected by riding the air flow. FIG. 6 is an enlarged view of a part of FIG. 4, showing the movement of the toner 4,
The airflow 5a around the suction tip plate 3a on the side of the toner scraping plate 2a and the airflow 5b around the suction tip plate 3b on the opposite side are shown in more detail. The same figure shows a specific example in which good results were obtained through experiments. Between B and 0.5mm toner suction device 3
The width C of the opening on the recording drum 1 side is 5.5 mm, the width D of the opening on the opposite side is 23 to 27 mm, the distance E between both openings is 30 to 36 mm, and the toner scraping blade 2a and recording Normal line 1 at the point of contact with drum 1
0 and the suction tip plate 3a, 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 to connect 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, since the tip of the scraping blade 2a is in contact with the suction tip plate 3a, almost all of the waste, toner, etc. floating due to the high speed rotation of the recording drum 1 are transferred to the suction tip plate 3a along with the air flow 5b. Since dirt, toner, etc. are smoothly sucked along the inside of the recording head 11 and do not reach the recording head 11, latent image recording is not hindered. At this time, developer 1
2. The transfer roller 13 is separated from the recording drum 1. When recording is finished, latching solenoid 1
5 is released, the connecting plate 2e is pulled by the spring 2g and moves counterclockwise, and the scraping blade 2a comes into contact with the recording drum 1. Further, the sensor 2f senses the movement of the connecting plate 2e, 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 as described above, and at the same time is sucked by the suction device 3. 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 in contact with the recording drum 1. Sensor 2f, solenoid 15
is 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 and the developing device 1.
2. It is connected to the transfer roll 13, the blower 6b, etc., and an operation panel (not shown), and 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.
In other words, the latching solenoid 15 has the role of separating the scraping blade 2a from the recording drum 1 during latent image recording, but it remains in that state even when the power is suddenly cut off, so that the recording drum 1 can rotate at high speed. Medium (e.g. 4000r.pm) scraping blade 2
a does not come into contact with this. During the copying 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 the two come into contact during high speed rotation, there is a risk that both of them will wear out more quickly. It is.

With the above structure, as shown in FIG. 6, as the recording drum 1 moves (rotation direction of arrow 8), the toner 4 remaining after transfer passes under the suction tip plate 3b and is scraped off by the scraping blade 2a. At the same time, since the tip of the opening of the suction device 3 is narrowed, it is lifted up by the high-speed airflow at the tip of the suction device 3, and is suctioned and collected more quickly and reliably. In this case, as described above, the suction tip plate 3a and the recording drum 1
Since the distance A (1.2 mm) between the suction tip plate 3b and the recording drum 1 is larger than the distance B (0.5 mm) between the suction tip plate 3b and the recording drum 1, the air flow 5a directly above the scraping blade 2a is large, increasing the effect of flying up the toner 4. let 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 flow 7000/min, maximum wind pressure 33mm/
H ₂ O Effects of the invention Since the invention has the above-described structure and operation, most of the waste and toner floating due to the high-speed rotation of the recording drum during latent image recording is absorbed into the opening of the toner suction device. The toner scraping blade on the side is also sucked in from the opposite side, guided inside the opening of the suction device, smoothly sucked, and prevented from reaching the recording head. During copying, the toner scraping blade At the same time as the toner is scraped off from the recording head, the toner is sucked and collected by the suction device by the air flow that passes through the gap formed between the blade and the tip of the blade side of the opening of the toner suction device, and the toner is collected by the suction device. Since the gap between the tip and the recording drum is larger than the gap between the tip and the recording drum on the opposite side of the scraping blade, the air flow directly above the scraping blade is large.
This increases the effect of toner lifting, and the excess toner scraped off by the scraping blade is collected more quickly and reliably, preventing toner from accumulating or spilling into the device, and further improving the toner suction device. Since both end faces are open, toner can be evenly sucked over the entire surface of the recording drum, making it possible to clean the recording head efficiently, so that it does not interfere with latent image recording or copying. A cleaning device for a copying machine or the like is obtained.

[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 ...〓Interval, 6...
Toner recovery device, 11...recording head, 12...
Developing device, 13...Transfer roller.

Claims (1)

[Claims for Utility Model Registration] 1. A toner suction device 3 having a toner scraping blade 2a and an opening close to the recording drum 1.
and a blade operating mechanism for bringing the toner scraping blade 2a into contact with and separating from the recording drum 1,
During copying, the toner scraping blade 2a contacts the recording drum 1, and air passes between the blade 2a and the tip of the toner scraping blade 2a side of the opening of the toner suction device 3.
5a, and during latent image recording, it is separated from the recording drum 1 and comes into contact with the tip on the side of the blade 2a, and is arranged so as to close 5a while the air flow passes through, and scrapes off the toner from the opening part of the blade 2a.
The distance A between the leading end of the opening and the recording drum 1 is larger than the distance B between the leading end of the opening opposite to the toner scraping blade 2a and the recording drum 1, and the toner suction device 3. A cleaning device for a copying machine, etc., characterized in that both end faces in the longitudinal direction of 3 are open and provided with openings 3d and 3d'. 2. The blade operating mechanism includes a latching solenoid connected to the toner scraping blade, a sensor that detects the operation of the latching solenoid, and a control device connected to the sensor and the latching solenoid. A cleaning device for a copying machine, etc. as set forth in claim 1 of the utility model registration claim.