JP3204076B2 - Electrophotographic copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying apparatus in which a cleaned toner is selectively conveyed so as to be reused or discarded as waste toner.

[0002]

2. Description of the Related Art In recent years, toner used in an electrophotographic copying apparatus and collected by cleaning may be reused.

[0003] Recycling and disposal of collected toner in a conventional electrophotographic copying machine will be described below.

FIG. 6 is a schematic diagram showing a configuration of a conventional electrophotographic copying apparatus disclosed in Japanese Patent Publication No. 4-54955 for reducing the amount of collected toner. In FIG. The remaining residual toner is scraped off by the cleaning blade 2 and collected on the bottom of the cleaning device 3. The collected toner is discharged in one direction by the screw 4 and returned to the developing device 7 by the conveying screws 5 and 6.

At this time, an electromagnetically operated valve 8 is provided at a branch point from the conveying screw 6. When the valve 8 is closed, the collected toner is further conveyed and stored in the collecting container 9. Is configured. Reference numeral 10 denotes a new toner supply port.

Japanese Patent Application Laid-Open No. 57-122472 discloses a method in which a collected toner that has been cleaned is once collected in a toner reservoir by a screw, and another screw is disposed so as to be able to rotate forward and reverse through the toner reservoir. At the same time, forming a communication part at both ends communicating with the developing device and the toner collection bottle,
There is disclosed a configuration in which another screw that has penetrated the toner reservoir is rotated forward and reverse to switch the collected toner to a developing device or a toner collection bottle and convey it.

[0007]

However, in the above-mentioned conventional configuration, the former transports the collected toner by one screw, and operates the valve at the developing device to reuse or discard it as it is. As a result, it is very difficult to control whether the collected toner is worthy of reuse or is to be discarded as it is, and the collected toner to be discarded is returned to the developing device to deteriorate the copy quality. Was. Since the performance of the used toner deteriorates, select whether it can be reused or discarded when the amount of reduced toner increases and at the early stage of cleaning. However, there is no disclosure of a specific sorting configuration or sorting means.

In the latter case as well, the toner collected in the toner reservoir is transported by switching the screw forward and reverse to a developing device provided at both ends and a toner collecting bottle, and consequently being reused. It becomes very difficult to control whether the toner is worthy of recovery or should be discarded.
Returning the collected toner to be discarded as it is to the developing unit will cause the copy quality to deteriorate, and in order to prevent this, it is important to separate the toner near the cleaning device as described above. There is no disclosure of the sorting configuration or sorting means.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. In the present invention, the selection of a collected toner that is worthy of reuse or a collected toner that should be discarded as it is is separated at a location close to the cleaning device. It is an object of the present invention to provide a simplified electrophotographic copying apparatus.

[0010]

In order to solve this problem, an electrophotographic copying apparatus according to the present invention comprises a photosensitive drum, a developing device for visualizing a latent image on the photosensitive drum, and the photosensitive member. Cleaning means for collecting residual toner on the drum; and toner from the cleaning means in a certain transport direction.
And a toner collecting means for collecting the toner.
A toner collection container for storing toner,
First toner that conveys the toner collected by the means to the developing device
Transport means, and the toner collected by the toner collecting means.
Second toner conveying means for conveying the toner to the toner collection container;
The first toner transfer unit provided inside the toner collection unit.
Conveying the toner from the feeding means and the second toner conveying means
Or conveying toner only from the second toner conveying means.
Switching means for switching between power-on and power-off.
Or for a certain period of time during the copying operation after leaving for a predetermined period of time
The switching means is switched so as to collect the used toner as waste toner .

A photosensitive drum, and on the photosensitive drum
A developing device for visualizing the latent image of the photosensitive drum;
Cleaning means for collecting excess toner;
The photosensitive drum is located upstream of the photosensitive drum in the rotating direction of the photosensitive drum.
Toner concentration detection method for detecting residual toner concentration on the ram surface
Step and toner from the cleaning means in a certain transport direction.
Means for collecting toner, and
A toner collection container for storing the toner
The toner provided on the upstream side in the transport direction of the collecting means
First toner transport means for transporting the toner to the imager, and toner collection
A toner provided on the downstream side in the transport direction of the
A second toner conveying means for conveying the toner to the collection container, and the toner
-The first toner conveying means provided inside the collecting means;
And conveying the toner from the second toner conveying means, or
Whether the toner is conveyed only from the second toner conveying means.
; And a switching means for switching, the toner which has been pre-Symbol recovered when the residual toner density on the photosensitive drum surface is detected a predetermined value is recovered as toner <br/> over to be discarded by the toner concentration detection means as the residual toner density on the photosensitive drum surface by the toner density detecting means so as to switch the switching means switches the switching means so as to recover as waste toner has been a toner recovery upon detection of a predetermined value as It was done.

Further, a photosensitive drum and the photosensitive drum
Developing device for visualizing the latent image on the
Density detecting means for detecting the toner density in the developing unit
And a cleaner for collecting residual toner on the photosensitive drum.
Cleaning means and a certain transport method from this cleaning means.
A toner collecting means for collecting toner in the
A toner collection container containing toner to be discarded inside,
A toner provided upstream of the toner collecting means in the conveying direction;
First toner conveying means for conveying the toner to the developing device;
Toner provided downstream of the toner collecting means in the transport direction.
Second toner conveying means for conveying the toner to the toner collection container;
The first toner transfer unit provided inside the toner collection unit.
Conveying the toner from the feeding means and the second toner conveying means
Or conveying toner only from the second toner conveying means.
Or comprising a switching means for switching to, switching the switching means so as to collect the toner in which the toner density in the developing device was recovered upon detection of a predetermined value as a toner to be discarded by the toner concentration detection means It is like that.

On the other hand, a photosensitive drum and this photosensitive drum
A developing device for visualizing the latent image on the photosensitive drum;
Cleaning means for collecting residual toner;
That collects toner in a certain transport direction from the tonering means
-Recovering means and containing the discarded toner among the toner
Toner collecting container and the transport of the toner collecting means
A toner conveying device provided upstream in the direction
(1) Toner conveying means and the conveying method of the toner collecting means
Transports toner to the toner collection container
A second toner conveying means for performing the operation, and an inside of the toner collecting means.
The first toner conveying means and the second toner
Conveying the toner from the conveying means or conveying the second toner;
Switching means for switching whether the toner is conveyed only from the feeding means
When power is turned on or left for a predetermined time, copy
-The collected toner is discarded for a certain period of time during operation
Switching the switching means so as to collect the toner.
It is like that.

As a result, an electrophotographic copying apparatus is provided which can select whether the toner is recyclable or should be discarded, and automatically switch between returning to the developing unit and storing in the toner collecting container.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a photoconductor drum, a developing device for developing a latent image on the photoconductor drum, and a residual toner on the photoconductor drum. Cleaning means to recover and from this cleaning means
A toner collection unit that collects toner in a certain transport direction;
Collection of toner containing toner discarded among the toner
A container and the toner collected by the toner collecting means.
First toner transport means for transporting the toner to the imager, and toner collection
Conveying the collected toner to the toner collection container
A second toner conveying means, and a toner collecting means provided inside the toner collecting means.
The first toner conveying means and the second toner conveying
Means for transporting toner from
Switching means for switching whether to convey toner from only the stage.
Copy operation at power-on or after leaving for a predetermined time
Toner that discards the collected toner for a certain time during cropping
Switch the switching means so as to collect
After turning on the power or leaving it for a predetermined time
During a certain copy operation, the collected toner is discarded for a certain period of time.
Has the effect of sending it to a toner collection container for disposal
You.

According to a second aspect of the present invention, there is provided a photosensitive drum, a developing device for developing a latent image on the photosensitive drum, and a cleaning unit for collecting residual toner on the photosensitive drum. When the toner concentration detection means for detecting the residual toner density of the surface of the photosensitive drum to the photosensitive drum rotation direction upstream side of the cleaning unit, the cleaning
Toner collection that collects toner in a certain transport direction from the means
Means for storing toner discarded among the toner.
Toner collection container and the toner collection unit in the transport direction.
A first toner provided on the flow side for conveying the toner to the developing device;
-Conveying means, and the conveying direction downstream of the toner collecting means.
Side for conveying toner to the toner collection container
(2) provided inside the toner conveying means and the toner collecting means
The first toner conveying means and the second toner conveying means
Conveying the toner from a stage or the second toner conveying means
; And a switching means for switching whether to convey the toner from only, the toner by the toner concentration detection means residual toner density on the photosensitive drum surface is the recovery upon detection of a predetermined value as a toner to be discarded is obtained by such switching said switching means so as to recover, whether the signal with by Tsu <br/> to switch the switching shutter of the detection means, the toner which has been recovered is returned to the developing device Or sorting and transport control such as sending the toner to a toner collection container
Has the effect of being automatic and easy .

According to a third aspect of the present invention, there is provided a photosensitive drum, a developing device for visualizing a latent image on the photosensitive drum, and a toner density provided in the developing device and in the developing device. a toner density detecting means for detecting, and cleaning means for recovering the residual toner on the photosensitive drum, the Kleene
That collects toner in a certain transport direction from the
Collecting means for storing the toner to be discarded out of the toner;
A toner collecting container and a transfer method of the toner collecting means.
The first, which is provided on the upstream side and conveys the toner to the developing device,
Toner conveying means and the conveying direction of the toner collecting means
The toner provided on the downstream side is transported to the toner collection container.
A second toner conveying means, and an inside of the toner collecting means.
The first toner conveying means and the second toner conveying means are provided.
Conveying the toner from the feeding means or conveying the second toner
Comprising a <br/> and switching means for switching whether to convey the toner from the means only, the recovered toner is discarded when the toner density in the developing device by the toner density detecting means detects the predetermined value that is obtained by such switching the switching means to recover a toner, also by detecting a change of the toner density in the developing device by the toner density detecting means, a developing toner recovered as above Symbol The sorting / transporting control such as returning to the container or sending the toner into the toner collecting container is automatically and easily performed .

According to a fourth aspect of the present invention, there is provided a photosensitive drum, a developing device for developing a latent image on the photosensitive drum, and a cleaning unit for collecting residual toner on the photosensitive drum. And a certain transport from this cleaning means
Toner collecting means for collecting toner in the direction, and the toner
And a toner collection container for storing the discarded toner.
A toner provided upstream of the toner collecting means in the conveyance direction.
A first toner conveying means for conveying the toner to the developing device;
A toner provided downstream of the toner collecting means in the conveying direction;
Second toner conveying means for conveying the toner to the toner collecting container
And the first toner provided inside the toner collecting means.
Transporting the toner from the transport unit and the second toner transport unit;
Or toner from only the second toner conveying means.
; And a switching means for switching whether to transport, and the toner which is the collecting certain time during the copy operation after leaving the power-on or a predetermined time to switch the switching means to recover a toner to be discarded Things,
Even when copying operation after leaving the power-on or a predetermined time, the sorting conveyor control such predetermined time is sent into the toner container in order to discard the toner collected as above Symbol
It has an automatic and easy action.

[0019]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of the present invention.

In the figure, 11 is a photosensitive drum, 12 is a developing device for visualizing a latent image on the photosensitive drum, 13 is a cleaning blade for collecting residual toner on the photosensitive drum, and 14 is a cleaning means. A toner collection pipe for collecting the collected toner and discharging the collected toner in one direction; 15 a toner collection container; 16 a toner transport pipe disposed between the toner collection pipe 14 and the developing device 12; The toner conveying pipe is disposed between the toner collecting container 15 and the toner collecting pipe 15. A screw is provided in each of the toner recovery pipe and the toner transport pipe. A switching shutter for switching the transport of the collected toner, which will be described later, is provided near the end of the toner collection pipe 14. When the toner collected by the switching shutter is collected for recycling, the toner is returned to the developing device 12 via the toner transport pipe 16. When the toner is recovered as waste toner, the toner is stored in the toner recovery container 15 via the toner transport pipe 17. It is configured.

As shown in FIG. 2, openings 18 and 19 are formed in the lower portion of the toner collecting pipe 14 near the end of the toner collecting pipe 14 on the upstream side in the toner collecting direction and on the downstream side in the toner collecting direction. The transport pipe 16
The opening 19 is configured to communicate with the toner transport pipe 17. A toner collecting screw 20 that collects the toner collected by the cleaning blade 13 at the end of the toner collecting pipe 14 is rotatably disposed therein.

Reference numeral 21 denotes a switching shutter rotatably provided inside the toner collecting pipe 14. An opening 22 formed below the toner collecting pipe 14 and coinciding with the opening 18 on the upstream side in the toner collecting direction. Opening 1 formed in the lower part of recovery pipe 14 on the downstream side in the toner recovery direction
An opening 23 corresponding to 9 is formed. Further, as shown in FIG.
4 is meshed with a gear 26 of a lever 25 provided outside the toner collection pipe 14, and the solenoid 2
7 is driven to rotate. Further, when the switching shutter 21 rotates and the opening 18 on the upstream side in the toner collecting direction of the toner collecting pipe 14 is closed, the opening 28 which is in communication with the opening 19 on the downstream side in the toner collecting direction of the toner collecting pipe 14 communicates. Are formed. The opening 28 may be separate from the opening 23 or may be a continuous opening. 29 and 30 are screws disposed in the toner transport pipes 16 and 17,
31 is a spring for urging the lever 25.

Next, the operation of switching the collection of the collected toner will be described in detail. Since the performance of the used toner is deteriorated, if the toner is returned to the developing device and reused, the copy quality is deteriorated. For this reason, it is desirable to collect and discard the degraded toner.

According to the present invention, for example, the toner collected by the cleaning means is returned to the developing device until the copy number detecting means detects the first predetermined number of 1000 sheets, and the toner is recovered until the next predetermined number of 100 sheets is detected. The toner is stored in the toner collecting container and discarded. During the first 1000 copies, the solenoid 27 shown in FIG. 3 is OFF and the lever 25 is biased by the spring 31. The opening 22 of the switching shutter 21 shown in FIG. 2 coincides with the opening 18 of the toner collecting pipe 14 on the upstream side in the toner collecting direction.
2 and the opening 18, the toner is returned to the developing device 12 by the toner conveying pipe 16 and reused. At this time, the opening 23 is also the opening 19 on the downstream side of the toner collecting pipe 14 in the toner collecting direction.
And communicates with the toner transport pipe 17, but when copying with a developer of normal density, the amount of collected toner is also substantially constant, so the opening 22 on the upstream side in the toner collection direction is closed. If the size is formed to a certain size corresponding to this amount, the collected toner is almost returned to the developing device 12 through the opening 22 and the toner conveying pipe 16 through the opening 23 and sent to the toner conveying pipe 17 through the opening 23. Absent.

In this embodiment, an original of A4 size with a character portion of 6% is used, and the opening is such that the maximum amount of toner consumption is 32 mg per copy, with a toner consumption of 32 mg per copy. In terms of configuration, the switching shutter inner diameter is 13
mm, the blade diameter of the toner collecting screw is 12 mm, the pitch is 14 mm, and the number of rotations is 300 rpm. The opening on the upstream side in the toner collecting direction is formed as 9 × 9 mm.

When a copy is made with an excessively high concentration of the developer, the amount of the collected toner also becomes excessive and overflows from the opening 22. Will be accommodated.
Therefore, it is possible to prevent the toner density of the developing device from further increasing.

When 1,000 copies are detected, FIG.
Is turned ON, the lever 25 is pulled, the gear 24 is rotated, and the switching shutter 21 is rotated. Due to this rotation, the opening 18 on the upstream side in the toner collecting direction formed at the lower portion of the toner collecting pipe 14 is closed, and the opening 19 on the downstream side in the toner collecting direction communicates with the opening 28 in alignment. Therefore, the collected toner collected by the cleaning means is stored in the toner collection container 15 through the opening 28 and the opening 19 by the toner conveying pipe 17 and is discarded. This operation is continued during the copying of 100 sheets.
The operation is repeated alternately with the operation for 0 sheets.

During the above-mentioned copying of 1000 sheets, the toner collected by the cleaning means is returned to the developing device, and
As a means for switching the solenoid so that the toner is stored in the toner collecting container during the copying of 00 sheets, the solenoid may be switched by a signal from a copy count signal.

Further, in place of the operation for the next 100-sheet copy, the drive of the transfer conveying means and the latent image forming means is stopped while the photosensitive drum and the developing device are driven for a predetermined time, in this embodiment, 2 minutes. Then, without charging the photosensitive drum, a bias voltage of -250 V having the same polarity as the charging polarity of the opposite polarity toner is applied to the developing roll, and the opposite polarity toner is attached to the photosensitive drum. The same effect can be obtained even when the toner is stored in the toner collection container.

As shown in FIG. 2, the blade end of the toner collecting screw 20 is formed only up to the upstream end of the opening 23 of the switching shutter 21 in the toner conveying direction, and the collected toner is conveyed beyond this opening 23. I try not to.

The switching shutter 21 is configured to rotate between the toner collecting pipe 14 and the switching shutter 21. When it is necessary to prevent the toner from entering between the two and hindering the rotation. As shown in FIG. 4, a plurality of rings 32 may be arranged on the outer periphery of the switching shutter 21. If a plurality of cutouts 33 are formed at several places in the axial direction of the ring 32, the intruded toner can move in the axial direction and fall into the toner transport pipes 16 and 17.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention. Reference numeral 34 denotes a light emitting element for detecting the density of toner remaining and adhering to the surface of the photosensitive drum 11 after transfer. This is a toner density detecting element including a light receiving element, and is disposed upstream of the cleaning unit 13 in the rotation direction of the photosensitive drum. Toner density detecting element 3 under the condition that the potential of a white background on the surface of the photosensitive drum, in this embodiment, the potential of the photosensitive drum surface is about -100 V and the developing roll potential is -250 V
4 detects the optical density of the toner remaining on and adhered to the surface of the photoreceptor drum after the transfer, and when the optical density exceeds a predetermined value, a sensor corresponding to the optical density in the initial state according to the present invention. When the output is 0.15 V or less and 0.25 V or more is indicated, it is determined that the reverse polarity toner has exceeded a predetermined content, and the solenoid 27 is energized after the copy operation is completed by the detection signal. The toner conveying path, which had been collected in the developing device as a recycled toner, was changed to a toner collecting container for disposal, and the photosensitive drum and the developing device were driven for a predetermined time, in this embodiment, transferred for 2 minutes to transfer the toner. With the driving of the conveying unit and the latent image forming unit stopped, the photosensitive drum is not charged, and a bias voltage of −250 V having the same polarity as the charging polarity of the opposite polarity toner is applied to the developing roll, and the opposite polarity is applied to the photosensitive drum. toner After deposited allowed, it can be recovered by the cleaning means be accommodated in the toner recovery container to obtain the effect similar to the above.

Further, as another embodiment of the present invention, the toner concentration in the developer is detected by a magnetic permeability sensor disposed in the developing device 12, and the toner concentration is determined to be a predetermined toner concentration, that is, the present invention. In 3.5% sensor output is 2.5V on average
When the output decreases to 2.2 V, it is determined that the toner concentration is equal to or higher than a predetermined toner concentration (about 4%).
7, the toner conveyance path which has been collected in the developing device as a recycled toner until then is changed to a toner collection container for disposal, and the output of the magnetic permeability sensor is lower than a predetermined toner concentration. In this case, the same operation as described above can be obtained by turning off the power supply and returning the toner conveying path to the developing device side, and also an effect of suppressing an increase in toner concentration in the developer can be obtained. A similar effect can be obtained by using a toner concentration sensor.

Further, as another embodiment of the present invention,
When the copying operation is performed when the power is turned on or after the copying operation is not performed for a certain period of time, the collected toner adhered to the inner wall of the toner transfer path falls off the inner wall due to the impact of the operation such as initialization, and the continuous copying is performed. -About 0.5 g / mi in the state
n recovery toner transfer speed, but temporarily about 1
The collected toner is rapidly conveyed to the developing device at a conveyance speed of g / min, and is not copied when the power is turned on or for a certain period of time in order to prevent fogging and toner scattering caused by insufficient stirring. When the copying operation is performed after being left unattended, the solenoid is energized for a predetermined period of time, and the toner transport path which has been collected in the developing device as the recycled toner until then is changed to the toner collecting container for disposal, and By turning off the energization after a lapse of time and switching the toner transport path, the same effect as described above can be obtained, and a sudden supply of the collected toner can be prevented.

[0036]

As described in detail above, the present invention provides a photosensitive drum, a developing device for developing a latent image on the photosensitive drum, and a cleaning means for collecting residual toner on the photosensitive drum. From the cleaning means
And a toner collection pipe that collects toner
Toner collection container for storing toner
Toner transport pipe for transporting the collected toner to the developing device
And the collected toner in the toner collection pipe
Toner transport pipe for transporting the toner to the toner and a toner recovery pipe
A first toner conveying pipe and a second toner
Conveying toner from conveying pipe or conveying second toner
A switcher that switches whether to convey toner only from the pipe
; And a Potter, a recovery or toner collected by the switching shutter as preparative <br/> toner to be discarded or recovered as recycled, certain time of copying operation after leaving the power-on or a predetermined time Because the time is switched, it is possible to sort the collected toner that is worthy of reuse or the collected toner that should be discarded as it is near the cleaning device. Can be prevented.

[0037] In addition, conveyance of the collected toner in the toner collecting pipe.
The first toner feeder provided upstream in the direction
Toner transfer pipe and toner recovery pipe
Transports the toner to the toner collection container
Inside the second toner transport pipe and the toner recovery pipe
A first toner transport pipe and a second toner transport pipe
Transfer the toner from the second toner transfer pipe or
A switching shutter that switches whether to transport toner from
Since the switching shutter is provided and the switching control is performed by detecting the state of the toner, it is possible to automatically perform the return to the developing device or the accommodation in the toner collecting container, and the sorting control becomes easy.

Further, the toner concentration in the developer is detected by toner concentration detecting means provided in the developing device, and the toner concentration in the developer is detected.
Since the conveyance direction of the collected toner is switched by detecting the density state, many effects such as suppressing an increase in the toner density in the developer can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a schematic configuration of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the present invention.

FIG. 3 is a side view for explaining rotation of the switching shutter of the present invention.

FIG. 4 is a perspective view of a switching shutter according to the present invention.

FIG. 5 is a sectional view of a main part of the present invention.

FIG. 6 is a schematic diagram showing a conventional configuration for returning collected toner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Photoconductor drum 12 Developing device 13 Cleaning blade 14 Toner recovery pipe 15 Toner recovery container 16 Toner transport pipe 17 Toner transport pipe 18 Opening 19 Opening 20 Toner recovery screw 21 Switching shutter 22 Opening 23 Opening 24 Gear 25 Lever 26 Gear 27 Solenoid 28 Opening 32 Ring 33 Notch 34 Toner density detecting element

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Toshimasa Kambe 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Mitsuru Oikawa 1006 Odaka Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In-company (72) Inventor Akira Minobe 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-92873 (JP, A) JP-A-59-147375 (JP, A) JP-A-6-161332 (JP, A) JP-A-60-57365 (JP, A) JP-A-6-19312 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 21/10-21/12 G03G 15/08-15/08 507 G03G 21/00 370-540 G03G 21/14

Claims (4)

(57) [Claims] And 1. A photosensitive drum, a developing device for visualizing the latent image on the photosensitive drum, and a cleaning means for recovering the residual toner on the photosensitive drum, the Cleaning
To collect toner in a certain transport direction from the
Collecting means and storing the toner to be discarded among the toners
A toner collection container and the toner collected by the toner collection means;
A first toner conveying means for conveying the toner to the developing device;
The toner collected in the toner collecting means is transferred to the toner collecting container.
Toner conveying means for conveying the toner to the toner, and the toner collecting means
The first toner conveying means and the second
Toner is conveyed from the toner conveying means or the second toner
To switch whether toner is conveyed only from the toner conveying means.
; And a switching means, the waste toner that is the recovered predetermined time during the copy operation after leaving the power-on or a predetermined time Disposal
Electrophotographic copying apparatus is characterized in that so as to switch the said switching means so as to recover a toner to be. 2. A photosensitive drum, a developing device for visualizing a latent image on the photosensitive drum, cleaning means for collecting residual toner on the photosensitive drum, and rotation of the photosensitive drum by the cleaning means A toner concentration detecting means for detecting a residual toner concentration on the surface of the photosensitive drum on the upstream side in the direction,
And a toner collecting means for collecting the toner.
A toner collection container for storing toner,
Developing the toner provided on the upstream side in the transport direction of the means.
First toner conveying means for conveying the toner to a container,
The toner provided on the downstream side in the transport direction of the step
Second toner conveying means for conveying the toner to a collection container, and the toner
The first toner conveying means provided inside the collecting means;
The toner is conveyed from the second toner conveying means or
Whether the toner is to be conveyed only from the second toner conveying means
Changing; and a switching means, the toner concentration detecting means by said switching means so as to recover as toner residual toner density on the photosensitive drum surface is discarded pre SL collected toner upon detecting a predetermined value An electrophotographic copying apparatus characterized by switching between the two. 3. A photoreceptor drum, a developing device for visualizing a latent image on the photoreceptor drum, a toner concentration detecting means disposed in the developing device for detecting a toner concentration in the developing device, and Cleaning means for collecting the residual toner on the photosensitive drum , and
Collecting means for collecting toner, and disposing of the toner inside
Toner collection container containing toner to be used, and toner
The toner provided on the upstream side in the transport direction of the collecting means
First toner conveying means for conveying the toner to the developing device;
The toner provided on the downstream side in the transport direction of the collecting means
A second toner conveying means for conveying the toner to a toner collection container;
The first toner conveying means provided inside the toner collecting means.
And conveying toner from the second toner conveying means, or
Is the toner transported only from the second toner transporting means?
; And a switching means for switching, said switching means so as to collect the toner in which the toner density is the recovery upon detection of a predetermined value in said developing unit by the toner concentration detection means as a toner to be discarded An electrophotographic copying apparatus characterized by switching. 4. A photosensitive drum, a developing device for visualizing the latent image on the photosensitive drum, and a cleaning means for recovering the residual toner on the photosensitive drum, the Cleaning
To collect toner in a certain transport direction from the
Collecting means and storing the toner to be discarded among the toners
A toner collection container and the transport direction of the toner collection unit
A first toner conveying roller provided on the upstream side for conveying the toner to the developing device.
Toner conveying means, and the toner collecting means below the conveying direction.
Conveys toner to the toner collection container provided on the flow side
A second toner conveying means, and a toner collecting means provided inside the toner collecting means.
The first toner conveying means and the second toner conveying
Means for transporting toner from
Switching means for switching whether to convey the toner only from the stage, and when the power is turned on or during a copying operation after leaving for a predetermined time, the switching means is configured to collect the collected toner as discarded toner for a certain period of time. An electrophotographic copying apparatus characterized by switching.