JP2577316Y2 - Electrostatic printing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic printing apparatus using the principle of electrophotography.

[0002]

2. Description of the Related Art Printing by an electrophotographic method is conventionally known. An electrostatic printing apparatus applying the principle of the electrophotographic method fixes a toner image formed on a photoconductive sheet (hereinafter, referred to as a photosensitive sheet) as a photoconductor by an electrophotographic method, thereby forming a non-photosensitive sheet. By forming an insulating image pattern, that is, a print master on a photosensitive sheet, and then uniformly charging the print master, uniformly irradiating light to discharge the photosensitive portion, and then developing. This is a device for forming a new toner image by adhering toner powder only on a non-photosensitive fixing toner image, and transferring this onto an appropriate transfer material such as transfer paper.

[0003] As an example of such a conventional electrostatic printing apparatus, there is an electrostatic printing apparatus disclosed in Japanese Patent Application Laid-Open No. 3-126065. As shown in FIG. 6, in the electrostatic printing apparatus 1 disclosed in this publication, first, a copy mode is selected, and when a start button is pressed, the scroll drum 2 is pressed.
6, the photosensitive sheet 27 is uniformly charged by the charging corotron 35, and an electrostatic latent image corresponding to the document is formed on the photosensitive sheet 27 by scanning exposure synchronized with the rotation of the scroll drum 26. You. This electrostatic latent image is developed
5, the toner image is transferred onto a sheet by a transfer corotron 67, and the toner image on the sheet is fixed by a fixing device 70 to obtain a copy. Transfer Corotron 67
Transfer the toner image to the paper by the scroll drum 26
Is rotated one more revolution for a cleaning cycle.

In this cleaning cycle, the potential on the photosensitive sheet 27 is reduced to almost 0 volt by the charge eliminating corotron 36 (EC: Erase corotron) and the lamp 40 for uniform exposure and charge removal. The untransferred toner on the photosensitive sheet 27 is cleaned. The above is the basic operation of the copy mode, and one copy can be obtained by two rotations of the scroll drum 26. Photosensitive sheet 27 wound on scroll drum 26
Are reusable after cleaning.

Next, the print mode will be described. The printing mode includes a plate making step and a printing step. When the automatic print mode is selected, both steps are operated continuously. When the start button is pressed, the scroll drum 26 starts rotating at a medium speed, the charging corotron 35 uniformly charges the photosensitive sheet 27, and the electrostatic exposure corresponding to the document is performed by scanning exposure synchronized with the rotation speed of the scroll drum 26. A latent image is formed on the photosensitive sheet 27, and the latent image is developed by the developing device 45 to form a toner image on the photosensitive sheet 27. Next, the scroll drum 26 is rotated at a low speed, and the toner image formed on the photosensitive sheet 27 is fixed by the flash fixing device 41 to create a print master.

In this state, since the electrical characteristics of the print master are poor, the electrical characteristics of the print master are adjusted by the charging corotron 35 and the transfer corotron 67 while rotating the scroll drum 26 at a high speed. That is, a low potential phenomenon of the print master appears to be caused by the release of oxygen from the zinc oxide surface of the photosensitive sheet 27 at the time of flash fixing. On the other hand, while the scroll drum 26 is rotated at a high speed after the print master is fixed, the charging corotron 35 and the transfer corotron 67 and discharge the scroll drum 2
The airflow around the print master 6 is stopped to make the periphery of the print master rich in ozone, thereby speeding up the recovery of the charging characteristics of the print master.

[0007] This completes the plate making step, and subsequently the printing step is executed. In the printing step, the print master is uniformly charged by the charging corotron 35 while rotating the scroll drum 26 at a high speed, and then the entire surface of the print master is exposed by the uniform exposure lamp 40 to leave a charge only in the toner image portion. . This is transferred onto a sheet by a transfer corotron 67 and then fixed by a fixing device 70 to obtain a print image.

In the print mode, since the image exposure step is omitted, the scroll drum 26 can be rotated at a high speed. In the A4 size, a print speed of 100 sheets per minute can be achieved by two prints per rotation. it can. When printing of a predetermined number of sheets is completed, a cleaning process is started, and the print master is set to a charge eliminating corotron 36 (EC: Erase corotron).
After the charge is removed by the charge removing lamp 40, the toner is removed by the oppositely charged developing rolls 50a and 50b, and the toner attached to the image is removed.

When the cleaning step is completed, a step of winding the photosensitive sheet 27 is performed. In this winding step, the print master is wound into the scroll drum 26 by the winding mechanism A as shown in FIG.
That is, the print master portion on which the plate of the photosensitive sheet 27 is formed is taken up by the take-up shaft 32, and
The unused surface of the photosensitive sheet 27 wound around 8 is set on the outer peripheral surface of the scroll drum 26.

Further, by selecting "fixed plate" in advance, the winding of the photosensitive sheet 27 is prevented, and the plate just printed is held on the outer peripheral surface of the scroll drum 26. Thus, the same image can be printed by the same print master.

In FIG. 6, reference numeral 3 denotes a platen glass on which a document is placed, 8 denotes a light source for scanning and exposing the document placed on the platen glass, and 9 denotes reflected light from the document on a photosensitive sheet 27. Reference numeral 10 denotes a lamp carriage, reference numeral 10 denotes a lamp carriage, reference numeral 11 denotes a first mirror carriage, reference numeral 15 denotes a lens carriage, reference numeral 17 denotes a condenser lens, and reference numeral 18 denotes a second mirror carriage.

By the way, in such an electrostatic printing apparatus, the toner adhered to the print master is scraped off by the developing rolls 50a and 50b in the cleaning step. Therefore, when the scroll drum 26 rotates, the gap for passing the photosensitive sheet 27 formed on the scroll drum 26 enters the developing device. At this time, the developer adhering to the developing rolls 50a and 50b causes the scroll. The developer enters the drum 26, and the developer adheres to the unused surface of the photosensitive sheet 27.

When the unused surface of the photosensitive sheet 27 to which the developer is attached is set on the outer peripheral surface of the scroll drum 26,
As shown in FIG.
6 and the photosensitive sheet 27, the photosensitive sheet 27 is partially lifted off the scroll drum 26. Due to the lifting of the photosensitive sheet 27, a transfer failure occurs and white spots occur, which causes a problem that good image quality cannot be obtained.

To solve this problem, Japanese Utility Model Laid-Open Publication No. 63-21977 discloses a brush-shaped seal provided in the gap between the photosensitive drum 27 and the scroll drum 26 so as to prevent the carrier from entering the scroll drum 26. It is disclosed in the gazette. According to the brush-shaped seal disclosed in this publication, it is possible to prevent the carrier C attached to the developing roll from entering the inside of the scroll drum 26.

[0015]

By the way, in such an electrostatic printing apparatus, as described above, the developing roll 50 is used.
a, 50b has a developer, that is, toner and carrier C attached thereto. However, since carrier C is oppositely charged to the toner image of the print master, a part of the carrier C becomes Adsorbed to the image. As described above, the carrier C attracted to the print master enters the scroll drum 26 together with the photosensitive sheet 27 during the winding process of the photosensitive sheet 27.

However, the brush-type seal disclosed in Japanese Utility Model Laid-Open Publication No. 63-21977 can prevent the developer adhering to the developing roll from simply entering the scroll drum 26. It is not until the carrier C attached to the sheet 27 can be scraped off.

Then, a part of the carrier C that has entered the scroll drum 26 is separated from the photosensitive sheet 27 and adheres to an unused surface of the photosensitive sheet 27 which is to be pulled out of the scroll drum 26. Therefore, as described above, the problem that transfer failure occurs and white spots occur due to the lifting of the photosensitive sheet 27 still occurs.

The present invention has been made in view of such a problem, and an object of the present invention is to prevent a foreign matter such as a carrier from adhering to a photosensitive sheet and to surely prevent a transfer failure from occurring. An object of the present invention is to provide an electrostatic printing apparatus capable of obtaining a high image quality.

[0019]

According to a first aspect of the present invention, there is provided a photoconductor in which light reflected from a document is introduced, and the photoconductor is housed therein. A scroll drum for winding the used portion of the photosensitive member by the winding means and unwinding a part of the unused portion of the photoreceptor to set the outer peripheral surface thereof; and a mode setting means for selectively setting a copy mode and a print mode. , When the print mode is set,
Flash exposure means for creating a print master by flash exposure of the toner image formed on the photoreceptor, static elimination corotron for applying a predetermined charge to untransferred toner adhered to the photoreceptor, A discharge lamp that exposes only the untransferred toner on the printing master plate, develops an electrostatic latent image formed on the photoconductor, and cleans the untransferred toner adhered to the photoconductor. A developing device for collecting foreign substances such as a carrier adhered to the photoconductor, and rotating the scroll drum two times at least in a step of cleaning the untransferred toner adhering to the photoconductor. In an electrostatic printing apparatus comprising a corotron, a control unit for driving and controlling the discharging lamp and the developing device, the control means But when the cleaning step, as well as the ON at least the neutralization corotron to first rotation of the scroll drum, is characterized in that a control means for OFF the neutralization corotron in the second rotation of the scroll drum.

According to a second aspect of the present invention, there is provided a photoreceptor to which reflected light from a document is introduced, and a photoreceptor which is housed in the photoreceptor, and a used portion of the photoreceptor is wound up by winding means. A scroll drum for extending a part of the unused portion of the photosensitive drum and setting it on the outer peripheral surface thereof; a mode setting means for selectively setting a copy mode and a print mode; Flash exposure means for creating a print master by flash exposure of a toner image, a charge removing corotron for applying a predetermined charge to untransferred toner adhered to the photoconductor, and a plate of the print master by exposing the untransferred toner. A static elimination lamp that leaves only the untransferred toner on the top, and develops the electrostatic latent image formed on the photoconductor, and cleans the untransferred toner attached to the photoconductor. A developing device and the scroll drum to recover the carrier adhering to the life-and-death said photosensitive member,
In the electrostatic printing apparatus including the winding unit, the discharging corotron, the discharging lamp, and a control unit for controlling the driving of the developing device, the control unit performs a winding step after printing when setting the printing mode. Before the drive control of the wind-up means, during the cleaning process, the charge removing corotron is turned on for two rotations of the scroll drum, and the scroll drum 3 It is a control means for turning off the charge removing corotron for rotation and controlling the driving of the developing device.

Further, the invention according to claim 3 is that a photosensitive member into which reflected light from a document is introduced, the photosensitive member is housed inside, and a used portion of the photosensitive member is wound up by a winding means and the photosensitive member is wound. A scroll drum for extending a part of the unused portion of the photosensitive drum and setting it on the outer peripheral surface thereof; a mode setting means for selectively setting a copy mode and a print mode; Flash exposure means for creating a print master by flash exposure of a toner image, a charge removing corotron for applying a predetermined charge to untransferred toner adhered to the photoconductor, and a plate of the print master by exposing the untransferred toner. A static elimination lamp that leaves only the untransferred toner on the top, and develops the electrostatic latent image formed on the photoconductor, and cleans the untransferred toner attached to the photoconductor. And a developing device for collecting foreign matter such as a carrier adhered to the photoreceptor, and control means for controlling the driving of the scroll drum, the charge removing corotron, the charge removing lamp, and the developing device. In the apparatus, plate fixing selecting means for fixing the plate of the print master after printing of a predetermined number of sheets is provided, and the control means controls the scroll so as not to perform a cleaning step when plate fixing of the print master is not selected. It is a control means for controlling the drum, the neutralizing corotron, the neutralizing lamp, and the developing device.

[0022]

In the electrostatic printing apparatus according to the first aspect of the present invention, the control means turns ON / OFF the static elimination corotron.
Only by controlling the FF, the untransferred toner on the photoconductor can be effectively cleaned. Therefore, there is no need to provide any special cleaning means, and cleaning can be reliably performed at low cost. In addition, since it is not necessary to recover the carrier in the scroll drum, maintenance becomes extremely good. Further, since no special sequence is inserted before the photoconductor winding step, the waiting time of the user can be reduced. In addition, the static elimination corotron is used for the second rotation of the scroll drum.
Even if the FF is set, the untransferred toner is removed by the developing machine, so that the turning off of the charge removing corotron hardly affects the cleaning effect, and the foreign matter such as the carrier can be reliably collected.

According to the second aspect of the present invention, since the charge removing corotron can be kept ON during the two rotations of the scroll drum, similarly to the conventional cleaning process, the untransferred toner on the print master can be more reliably removed. Will be done. Further, in addition to this, since the step of collecting the carrier is performed before the drive control of the winding means, the carrier attached to the print master can be more effectively collected.

In the third aspect of the present invention, the cleaning process is not performed when there is no plate fixing instruction, so that foreign matter such as a carrier hardly adheres to the print master.
As a result, the photosensitive member is prevented from rising from the scroll drum. In addition, when the printing plate is not fixed, the winding process starts immediately without the cleaning process, so that the waiting time of the user when the printing plate is not fixed can be reduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view showing an embodiment of the electrostatic printing apparatus according to the present invention. A case in which this embodiment is applied to the above-described electrostatic printing apparatus shown in FIG. 6 will be described. FIG.
As shown in (1), the electrostatic printing apparatus 1 of this embodiment controls the driving means 101 of the scroll drum 26, the developing rolls 50a and 50b in the developing machine 45, the static elimination corotron 36, and the uniform exposure and static elimination lamp (FEL) 40. Control means 1
00 is provided.

The control means 100 rotates the scroll drum driving means 101 during the cleaning step,
As shown in FIG. 2, the static elimination corotron (EC) 36 is turned on. By turning on the neutralizing corotron 36, the toner image of the print master and the toner adhering to the print master are removed.
For example, a positive charge is given. Next, when the scroll drum 26 rotates by a predetermined amount, the control device 100 turns on the uniform exposure and neutralization lamp 40 to leave only the toner on the plate toner image in the print master. Further control device 1
00, when the scroll drum 26 is further rotated by a predetermined amount, the bias of the developing device 45 is turned on and the developing roll 50 is turned on.
a and 50b are rotationally driven.

With the rotation of the developing rolls 50a and 50b, the toner on the plate of the print master is scraped off by a magnetic brush formed of the spikes of the developer formed on the outer peripheral surface of the developing rolls 50a and 50b. The charged toner is adsorbed to the developing rolls 50a and 50b which are charged in a direction opposite to that of the toner (for example, -300V). At this time, the positive charge of the toner image of the printing master plate decreases. At this time, as described above, the developing rolls 50a,
Since the carrier C of the developer on the printing master 50b is negatively charged, a part of the carrier C is attracted to the toner image of the printing master plate when the printing master passes through the developing rolls 50a and 50b.

In this state, one revolution of the scroll drum 26 is completed, and the scroll drum 2 during the cleaning process is completed.
The second rotation of No. 6 is started. As shown in FIG. 1, when a detection signal for the second rotation of the scroll drum 26 is input from the rotation speed detection means 102 of the scroll drum 26, the control means 100 turns off the charge removing corotron 36 as shown in FIG. (In the case of the conventional electrostatic printing device described above,
The charge removing corotron 36 is maintained in the ON state even at the second rotation of the scroll drum 26 as indicated by a broken line in FIG. In this state, when the toner on the toner image of the print master enters the developing rolls 50a and 50b, it is scraped off by the magnetic brushes of the developing rolls 50a and 50b and is attracted to the developing rolls 50a and 50b.

At this time, in the second rotation of the scroll drum 26, the charge removing corotron 36 is turned off, and the toner image on the print master is not given a positive charge. It has become. Therefore, the carrier C attached to the toner image on the print master in the first rotation of the scroll drum 26 is
6, when the toner enters the developing rolls 50a and 50b by the second rotation, the magnetic brush of the developing rolls 50a and 50b allows the toner to be easily scraped off together with the toner, and the scraped carrier C is transferred to the developing rolls 50a and 50b. Moving. Thus, the cleaning process in this embodiment is completed.

After the cleaning process is completed, a winding process of the photosensitive sheet 27 is performed in the same manner as in the related art, and the photosensitive sheet 27 is wound by the winding shaft 32 and the printed plate is stored in the scroll drum 26. Along with
An unused portion of the photosensitive sheet 27 is fed out of the feed shaft 28 to the outside of the scroll drum 26, and an unused surface thereof is set on the outer peripheral surface of the scroll drum 26. In this case, since the carrier C does not adhere to the plate forming portion of the photosensitive sheet 27, the carrier C is
Of the photosensitive sheet 27 and does not adhere to the unused portion of the photosensitive sheet 27. Therefore, when the unused surface of the photosensitive sheet 27 is set on the outer peripheral surface of the scroll drum 26, the carrier C is not sandwiched between the scroll drum 26 and the photosensitive sheet 27, and the photosensitive sheet 27 is Floating is prevented. As a result, a good image quality can be obtained without causing a transfer failure and a defect such as a white spot.

As described above, according to the present embodiment, the photosensitive sheet 27 can be effectively cleaned only by controlling ON / OFF of the charge removing corotron 36 by the control means. Therefore, it is not necessary to provide a special cleaning means. Absent. Therefore, the merit in terms of cost is great, and since there is no need to collect the carrier in the scroll drum 26, the maintainability is extremely good.
Further, in this embodiment, since no special sequence is inserted before the winding step of the photosensitive sheet 27, the waiting time of the user can be reduced.

Further, even if the charge removing corotron 36 is turned off at the second rotation of the scroll drum 26, the toner is scraped off by the magnetic brushes of the developing rolls 50a and 50b. And the carrier C can be reliably recovered.

FIG. 3 is a schematic explanatory view showing another embodiment of the present invention. Note that a case will be described in which this embodiment is also applied to the electrostatic printing apparatus shown in FIG. As shown in FIG. 3, the electrostatic printing apparatus 1 according to the present embodiment includes a scroll drum 26.
And a control unit 100 for controlling the developing rolls 50a and 50b in the developing unit 45.

In this embodiment, as in the above-described conventional electrostatic printing apparatus and the above-described embodiments, when the cleaning process is completed, the winding process of the photosensitive sheet 27 is automatically performed. In particular, in the case of this embodiment,
The carrier collection step is performed before the winding step of the photosensitive sheet 27.

In this carrier recovery step, when the cleaning step is completed, that is, when two rotations of the scroll drum 26 are completed as in the conventional electrostatic printing apparatus, the rotation number detection means 102 detects the rotation number of the scroll drum 26. In response to the signal, the control means 100 turns off the charge removing corotron 36 and keeps the developing machine bias ON as shown in FIG.
Is driven. By the third rotation of the scroll drum 26, the carrier C attached to the print master is scraped off by the magnetic brushes of the developing rolls 50a and 50b and collected on the developing rolls 50a and 50b side in the same manner as in the above-described embodiment. Will be done.

When the carrier recovery step is completed, the control means 100 controls the take-up shaft 32 and the pay-out shaft 2.
By driving the driving means 8, the winding process of the photosensitive sheet 27 is performed.

In this embodiment, substantially the same effects as those of the above-described embodiment can be obtained. However, in this embodiment, during the cleaning process, that is, when the scroll drum 26
Since the charge removing corotron 36 is kept ON during the rotation, the untransferred toner on the print master can be more reliably removed.

In the present invention, the first embodiment shown in FIGS. 1 and 2 may be combined with the second embodiment shown in FIGS. That is, as in the first embodiment, the scroll drum 26 is used during the cleaning process.
In addition to turning off the charge removing corotron 36 in the second rotation, the carrier collecting step may be performed after the cleaning step and before the winding step as in the second embodiment. In this way, the carrier can be more effectively removed from the print master.

FIG. 5 is a schematic explanatory view showing still another embodiment of the present invention. In addition, a case where the present embodiment is similarly applied to the electrostatic printing apparatus shown in FIG. 6 will be described. FIG.
As shown in the figure, similarly to the conventional electrostatic printing apparatus, in the electrostatic printing apparatus of the present embodiment, the plate fixing selection button 10 is provided on the operation panel.
3 is provided, and after printing of a predetermined number of sheets set first is completed, if the user wants to print the plate further, the user presses the plate fixing selection button 103 to instruct the plate to be fixed. The printing master plate is fixed. In this state, a cleaning step similar to the cooling step in the above-described conventional electrostatic printing apparatus is performed.

When the user does not press the plate fixing selection button 103 to instruct plate fixing, the conventional electrostatic printing apparatus enters a cleaning step when the printing step is completed, and starts a winding step when the cleaning step is completed. , The electrostatic printing apparatus 1 of the present embodiment
In the above, when the plate fixing is not instructed, the cleaning process is not started when the printing process is completed, but the winding process is started.

That is, when there is no plate fixing command signal from the plate fixing selection button 103, the control means 100
Even after the printing process is completed, the scroll drum 101, the developing device 45, the charge removing corotron 36 and the charge removing lamp 40 are not driven, and the winding shaft 32 and the feeding shaft 28 are not driven.
Is driven to perform a winding process.

As described above, since the cleaning process is not performed when there is no plate fixing instruction, the carrier C is not attached to the print master. Therefore, when the photosensitive sheet 27 is wound by the winding shaft 32, the carrier C does not enter the scroll drum 26.
Photosensitive sheet 27 fed out of scroll drum 26
The carrier C does not adhere to the unused surface of.
As a result, the photosensitive sheet 27 is prevented from rising from the scroll drum 26, so that a problem such as white spots due to transfer failure does not occur, and good image quality can be obtained. In addition, when the printing plate is not fixed, the winding process starts immediately without the cleaning process, so that the waiting time of the user when the printing plate is not fixed can be reduced.

[0043]

As is apparent from the above description, according to the electrostatic printing apparatus of the first aspect of the present invention, there is no need to provide a special cleaning means, so that the merit in cost is extremely large and the maintenance performance is very high. Can be improved. Further, since no special sequence is inserted before the photoconductor winding step, the waiting time of the user can be reduced.

According to the second aspect of the present invention, since the charge removing corotron can be kept ON during two rotations of the scroll drum, similarly to the conventional cleaning step, the untransferred toner on the print master can be more reliably removed. Can be removed. Further, in addition to this, since the step of collecting the carrier is performed before the drive control of the winding means, the carrier attached to the print master can be more effectively collected.

According to the third aspect of the present invention, when there is no plate fixing instruction, foreign matter such as a carrier hardly adheres to the print master, so that the photosensitive member can be prevented from floating from the scroll drum. In addition, when the plate is not fixed, the winding process can be started immediately without the cleaning process, so that the waiting time of the user when the plate is not fixed can be reduced.

In the electrostatic printing apparatus according to any one of the first to third aspects, the foreign matter such as the carrier can be reliably collected, so that the photosensitive member can be prevented from floating from the scroll drum. Therefore, problems such as white spots due to transfer failure can be prevented, and good image quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of an electrostatic printing apparatus according to the present invention.

FIG. 2 is a diagram showing a timing chart in this embodiment.

FIG. 3 is a schematic explanatory view showing another embodiment of the present invention.

FIG. 4 is a diagram showing a timing chart in this embodiment.

FIG. 5 is a schematic explanatory view showing still another embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a conventional electrostatic printing apparatus.

FIG. 7 is a partially enlarged view showing a winding mechanism A in the electrostatic printing apparatus.

FIG. 8 is a diagram illustrating lifting of a photosensitive sheet from a scroll drum by a carrier.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrostatic printing device, 3 ... Platen glass, 8 ... Light source, 9
Reference numerals: optical system, 10: lamp carriage, 11: first mirror carriage, 15: lens carriage, 17: condensing lens, 18: second mirror carriage, 26: scroll drum, 27: photosensitive sheet, 28: feeding shaft, 32 ... winding shaft, 35 ... charged corotron, 36 ... static elimination corotron (EC: Erase corotron), 40 ... uniform exposure and static elimination lamp, 41 ... flash fixing device, 45 ... developing machine, 50a,
50b: developing roll, 67: transfer corotron, 70: fixing device

Claims (3)

(57) [Scope of request for utility model registration] 1. A photoreceptor into which reflected light from a document is introduced, and a photoreceptor housed in the photoreceptor, a used portion of the photoreceptor being wound by winding means, and A scroll drum that feeds out the portion and sets it on the outer peripheral surface thereof; mode setting means for selectively setting a copy mode and a print mode; and when the print mode is set, the toner image formed on the photoconductor is flash-exposed. A flash exposure unit for creating a print master, a charge eliminating corotron that applies a predetermined charge to the untransferred toner adhered to the photoconductor, and only the untransferred toner on the plate of the print master by exposing the untransferred toner. A developing lamp for developing the electrostatic latent image formed on the photoconductor, cleaning the untransferred toner adhered to the photoconductor, and applying it to the photoconductor. A developing device that collects foreign substances such as a carrier attached thereto, and at least a step of cleaning the untransferred toner adhering to the photoreceptor, rotating the scroll drum twice, and removing the discharge corotron, the discharge lamp, and A control unit for controlling the driving of the developing device, wherein the control unit turns on at least the static elimination corotron at the first rotation of the scroll drum during the cleaning step, An electrostatic printing apparatus, which is a control unit that turns off the charge eliminating corotron at the second rotation of the drum. 2. A photoreceptor to which reflected light from a document is introduced, a photoreceptor accommodated in the photoreceptor, a used portion of the photoreceptor being wound up by a winding unit, and A scroll drum that feeds out the portion and sets it on the outer peripheral surface thereof; mode setting means for selectively setting a copy mode and a print mode; and when the print mode is set, the toner image formed on the photoconductor is flash-exposed. A flash exposure unit for creating a print master, a charge eliminating corotron that applies a predetermined charge to the untransferred toner adhered to the photoconductor, and only the untransferred toner on the plate of the print master by exposing the untransferred toner. A developing lamp for developing the electrostatic latent image formed on the photoconductor, cleaning the untransferred toner adhered to the photoconductor, and applying it to the photoconductor. A developing device for a carrier that is wear recovered, the scroll drum, said hoisting means,
An electrostatic printing apparatus comprising: a control unit that drives and controls the static elimination corotron, the static elimination lamp, and the developing device; wherein, when the print mode is set, the winding is performed to perform a winding process after printing is completed. Before the driving control of the means, during the cleaning step, the scroll
When the neutralizing corotron is turned on during two rotations of the drum,
Both in order to perform the step of recovering the career, the
Turn the neutralizing corotron on the third rotation of the scroll drum.
An electrostatic printing apparatus, which is a control unit that is an FF and controls driving of the developing device. 3. A photoreceptor into which reflected light from a document is introduced, a photoreceptor housed in the photoreceptor, and a used portion of the photoreceptor taken up by a winding means. A scroll drum that feeds out the portion and sets it on the outer peripheral surface thereof; mode setting means for selectively setting a copy mode and a print mode; and when the print mode is set, the toner image formed on the photoconductor is flash-exposed. A flash exposure unit for creating a print master, a charge eliminating corotron that applies a predetermined charge to the untransferred toner adhered to the photoconductor, and only the untransferred toner on the plate of the print master by exposing the untransferred toner. A developing lamp for developing the electrostatic latent image formed on the photoconductor, cleaning the untransferred toner adhered to the photoconductor, and applying it to the photoconductor. A developing device that collects foreign substances such as carriers attached thereto, and an electrostatic printing device that includes a control unit that drives and controls the scroll drum, the charge removing corotron, the charge removing lamp, and the developing device.
After the printing of a predetermined number of sheets is completed, plate fixing selecting means for fixing the plate of the print master is provided, and the control means does not perform a cleaning step when the plate fixing of the print master is not selected. An electrostatic printing apparatus, comprising: a control unit for controlling a charge removing corotron, the charge removing lamp, and the developing device.