KR19980053451A - Device and method for detecting backside of electrophotographic photocopier - Google Patents

Abstract

The present invention relates to a copying machine, and in particular, when copying from an electrophotographic copying machine, if a backing paper is detected from the supplied copying paper, it is automatically ejected, thereby saving copying paper and simultaneously reducing the copying time of an electrophotographic copying machine. It relates to a back paper detecting device and method.

Conventional electrophotographic photocopiers perform copying even if the backing paper is incorrectly inserted in the direction in which the backing paper was already inserted in the copy paper inserted in the tray during copying of the original, so that unnecessary papers caused by copying again on the already copied surface are removed. There is an issue that brings waste and time waste.

According to the present invention, a back paper detecting sensor is attached to a copy paper feeder of an electrophotographic copying machine, and if a back paper is jammed at the time of copying the document, the back paper is detected and automatically ejected. You can avoid wasting one copy paper and copying time.

Description

Device and method for detecting backside of electrophotographic photocopier

The present invention relates to a copying machine, and in particular, when copying from an electrophotographic copying machine, if a backing paper is detected from the supplied copying paper, it is automatically ejected, thereby saving copying paper and simultaneously reducing the copying time of an electrophotographic copying machine. It relates to a back paper detecting device and method.

In general, when copying from an electrophotographic photocopier, the copy paper is inserted into the tray 1, and then the copy start button provided on the console 30 is pressed to place on the document or platen glass inserted in the automatic document feeder. The original will be copied. At this time, even if the back surface is already inserted into the copy paper inserted in the tray 1 in the direction in which the copying surface is copied incorrectly, the copier unconditionally performs copying.

The conventional electrophotographic copying machine as described above performs copying even if the backing paper is incorrectly inserted in the direction of printing already on the copy paper inserted in the tray at the time of copying the original, which is caused by copying again on the already copied surface. There is a problem that wastes unnecessary paper and wastes time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and when copying an original, if the wrong paper is inserted into the tray, it detects it and automatically ejects it, thereby copying the original to be copied onto the already printed side of the paper. It is an object of the present invention to provide an apparatus and a method which can prevent copying papers and save copying time.

In order to achieve the above object, the present invention provides a device for detecting a backing paper of an electrophotographic copying machine. A back paper detecting unit having a plurality of photosensors for outputting a signal; LCD display means and key part to display the overall operation status of the use of the copier, such as the size selection of the original for copying, the division copy selection, the copy quantity selection, the copy density selection, the ratio of enlargement and reduction, and the selected operation mode. A console for outputting a selection signal corresponding to the; Controls the overall operation of the electrophotographic photocopier, determines the copy mode according to the selection signal applied from the console, and outputs a predetermined control signal in response to the detection signal applied from the back paper detecting unit when the back paper detecting mode is selected. A main processing unit; A first memory unit for storing overall program data for operating the main processor, and outputting operation data for operating the electrophotographic copying machine to the main processor in response to a selection signal applied from the console; A second memory unit for storing data generated during a copy operation according to a copy mode selected from the console; A D / A converter for converting a digital control signal applied from the main processor into an analog control signal and outputting the analog control signal; A high voltage supply unit which is switched on / off according to a control signal applied from the D / A converter to generate and output or cut off a high voltage power source; And a DTC for printing the toner transferred to the drum on the copy paper in correspondence with the document to be copied by the high voltage power source applied from the high voltage supply unit.

On the other hand, a method for detecting a backing paper of an electrophotographic photocopier, comprising: a first step of displaying a state of a copier and a copy mode main menu on a console when the electrophotographic photocopier is powered; After the first process, the main processor comprises a second process of checking whether a backing paper detection menu is selected from the console; In the second step, when the backing paper detection menu is selected, a third step of checking whether the automatic copy menu is selected after displaying the automatic copy menu; In the third process, if the automatic copy menu is selected, while the main processor transfers the copy paper inserted in the tray to the copy position, a fourth process of checking the presence or absence of the back paper of the copy paper by a plurality of photosensors of the back paper detection unit and; In the fourth process, if it is detected that the supplied copy paper is the backing paper, the high voltage generating unit is turned off to cut off the power of the DTC, thereby automatically discharging the copy paper without copying, and then returning to the fourth process. and; In the fourth process, if the supplied copy paper is not a backing paper, the main processing unit performs copying after transferring the copy paper to the copying position, and then returns to the fourth process if the copying is not finished. ; In the third process, if the automatic copy menu is not selected, the main processor performs a plurality of photosensors of the back paper detecting unit to check whether the copy paper is on the back paper before transferring the copy paper inserted in the tray to the copy position. Process; In the seventh step, when it is detected that the supplied copy paper is a backing paper, the eighth process asks whether the copying paper is to be copied or discharged as it is on the backing paper; In the eighth step, if the discharge is selected, by turning off the high voltage generating unit to cut off the power of the DTC, the ninth step of automatically discharging without copying to the copy paper and returning to the seventh step; In the seventh step, if the supplied copy paper is not a backing paper, the main processor performs copying after transferring the copy paper to the copying position, and then returns to the seventh step if copying is not finished. ; In the second process, if the back paper detection menu is not selected, an eleventh process of copying an original without performing back paper detection may be included.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a back paper detecting apparatus of an electrophotographic photocopier according to the present invention.

Figure 2 is an illustration of a back paper detection device of the electrophotographic copying machine according to the present invention.

3 is a plan view of the back surface detecting apparatus in the exemplary view shown in FIG.

4 is a flowchart of a method for detecting backside paper of an electrophotographic photocopier according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Tray 2: Copy Paper Support

3: main body 4,4 ': first roller

5,5 ': 2nd roller 6: copy paper

10: main processing unit 20: backing paper detection unit

21 ∼ 2N: Photosensor 30: Console

40: first memory part 50: second memory part

60: D / A converter 70: high voltage supply

80: DTC

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The back paper detecting apparatus of the electrophotographic copying machine according to the present invention has a main processor 10, a back paper detecting unit 20, a console 30, a first memory unit 40, a second as shown in FIG. And a memory unit 50, a D / A converter 60, a high voltage supply unit 70, and a DTC (DeTack Corotron; 80).

The main processor 10 determines the copy mode according to the selection signal applied from the console 30, and controls the overall operation of the copier by the signals detected and applied from each sensor according to the selected copy mode. When the back paper detecting mode is selected, copying is controlled according to a detection signal applied from the back paper detecting unit 20. The back paper detecting unit 20 includes a plurality of photosensors 21 to 2N, and checks the print density of the surface to be printed on the copy paper and outputs a detection signal if the copy paper is already printed. The console 30 is equipped with an LCD display and a key to display the overall operating status of the use of the copier, including the size selection of the original for copying, division copy selection, copy quantity selection, copy density selection, enlargement and reduction ratio, and the user. Outputs a selection signal corresponding to the copy mode selected by the " The first memory unit 40 is configured as a read only memory (ROM), and stores general program data about the operation of the copier and outputs corresponding operation data to the main processor 10 according to the selection of the copy mode. do. The second memory unit 50 is composed of random access memory (RAM), and stores data generated during copying according to the copy mode selected from the console 30. The D / A converter 60 converts a digital control signal applied from the main processor 10 into an analog control signal and outputs the analog control signal. The high voltage supply unit 70 is switched on / off according to a control signal applied from the D / A converter 60 to generate a high voltage power and output or cut off the DTC. The DTC 80 operates as a high voltage power is applied from the high voltage supply unit 70 to print the toner transferred to the drum on the copy paper in response to the original to be copied.

On the other hand, as shown in Figs. 2 and 3 attached to the present invention, the plurality of photosensors 21 to 2N of the backing paper detecting unit 20 is provided with a predetermined number of paper feed zones in the main body 3 of the electrophotographic copying machine. Is mounted in position.

Referring to the operation of the present invention configured as described above are as follows.

First, when the power of the electrophotographic copier is applied, the console 30 displays the state of the copier and the copy mode main menu (step S1). The main processor 10 checks whether the backing paper detection menu is selected from the console 30 (step S2), and if the backing paper detection menu is selected, displays the auto copy menu and then checks whether the auto copy menu is selected ( Step S5), when the automatic copy menu is selected, the main processing unit 10 transfers the copy paper inserted in the tray 1 to the copying position, and a plurality of photosensors 21 to 2N are supplied from the copy paper supplied. The print density of the surface to be copied is checked (step S6). Thereafter, when the printing density of the copy surface of the copy paper supplied is high, the photosensors 21 to 2N output detection signals, and the main processor 10 receives the detection signals applied from the photosensors 21 to 2N. When the detection signal is applied (step S7), the control signal is output to the high voltage supply unit 70 through the D / A converter 60 because the backing paper is applied, and the high voltage supply unit 70 is applied from the main processor 10. It is turned off according to the control signal, and does not output the high voltage power to the DTC 80. Therefore, the DTC 80 does not operate as the high voltage power is not supplied from the high voltage supply unit 70, so that the toner transferred to the drum in correspondence with the original to be copied is not printed on the copy paper, and the copy paper is kept as it is. After discharging (step S10), the flow returns to step S6. In addition, if the detection signal is not applied from the photosensors 21 to 2N of the back paper detecting unit 20 in step S7, since it is not a back paper, the main processing unit 10 transfers the copy paper to the copying position. The control signal is output to the high voltage supply unit 70 through the converter 60, and the high voltage supply unit 70 is turned on according to a control signal applied from the main processor 10 to generate a high voltage power supply to the DTC 80. Output Therefore, the DTC 80 operates according to a high voltage power source applied from the high voltage supply unit 70, prints the toner transferred to the drum on the copy paper in correspondence with the original to be copied (step S8), and inserts the inserted document. It is checked whether or not copying is completed (step S9), and if not, the flow returns to step S6.

On the other hand, it is checked in step S5 whether the automatic copy menu is selected, and if the automatic copy menu is not selected, the main processor 10 transfers the copy paper inserted in the tray 1 to the copy position. The photosensors 21 to 2N inspect the print density of the surface to be copied from the copy paper supplied (step S11). Thereafter, when the printing density of the copy surface of the copy paper supplied is high, the photosensors 21 to 2N output detection signals, and the main processor 10 receives the detection signals applied from the photosensors 21 to 2N. When the detection signal is applied (step S12), it is a backing paper, and a message indicating whether to use or ejecting the backing paper is displayed through the console 30 (step S15). The control signal is output to the high voltage supply unit 70 through the A converter 60, and the high voltage supply unit 70 is turned off according to the control signal applied from the main processor 10 to output the high voltage power to the DTC 80. I never do that. Therefore, the DTC 80 does not operate as the high voltage power is not supplied from the high voltage supply unit 70, so that the toner transferred to the drum in correspondence with the original to be copied is not printed on the copy paper, and the copy paper is kept as it is. After discharging (step S16), the flow returns to step S11. When copying is selected in step S15, the main processing unit 10 transfers the copy paper to the copying position, and then outputs a control signal to the high voltage supplying unit 70 through the D / A converter 60 to supply the high voltage supplying unit. 70 is turned on according to a control signal applied from the main processor 10 to generate a high voltage power and output it to the DTC 80. Therefore, the DTC 80 operates according to a high voltage power source applied from the high voltage supply unit 70, prints the toner transferred to the drum on the copy paper in correspondence with the original to be copied (step S13), and then inserts the inserted document. It is checked whether or not copying has finished (step S14), and if not, the flow returns to step S11. On the other hand, if the detection signal is not applied from the photosensors 21 to 2N of the back paper detecting unit 20 in step S12, since it is not a back paper, the main processing unit 10 transfers the copy paper to the copy position, The control signal is output to the high voltage supply unit 70 through the A converter 60, and the high voltage supply unit 70 is turned on according to a control signal applied from the main processor 10 to generate a high voltage power supply. Will output Therefore, the DTC 80 operates according to a high voltage power source applied from the high voltage supply unit 70, prints the toner transferred to the drum on the copy paper in correspondence with the original to be copied (step S13), and then inserts the inserted document. It is checked whether or not copying has finished (step S14), and if not, the flow returns to step S11.

As described above, the present invention provides a back paper detecting sensor in the electrophotographic copying machine, and detects the back paper when it is copied, and automatically ejects it, thereby preventing copying of the original to be copied onto the back paper, resulting in re-copying. You can avoid wasting one copy paper and copying time.

Claims (2)

In the backside paper detecting apparatus of the electrophotographic copying machine, a plurality of photosensors for inspecting the print density of the surface to be printed of the copy paper inserted in the tray 1 and outputting a predetermined detection signal if the copy paper is already printed ( A back paper detecting unit 20 having 21 to 2 N); LCD display means and key part to display the overall operation status of the use of the copier, such as the size selection of the original for copying, the division copy selection, the copy quantity selection, the copy density selection, the ratio of enlargement and reduction, and the selected operation mode. A console 30 which outputs a selection signal corresponding to the control signal; Controls the overall operation of the electrophotographic copying machine, and determines the copying mode according to the selection signal applied from the console 30, and if the backing paper detecting mode is selected, corresponding to the detection signal applied from the backing paper detecting unit 20. A main processor 10 for outputting a predetermined control signal; Overall program data for operating the main processor 10 is stored, and according to the selection signal applied from the console 30, operation data for operating the electrophotographic copier to the main processor 10 in response thereto. A first memory unit 40 for outputting; A second memory unit 50 for storing data generated during a copy operation according to the copy mode selected from the console 30; A D / A converter (60) for converting a digital control signal applied from the main processor (10) into an analog control signal and outputting the converted control signal; A high voltage supply unit 70 that is switched on / off according to a control signal applied from the D / A converter 60 to generate and output or cut off a high voltage power source; And a DTC (80) for printing a toner transferred to a drum on copy paper in response to an original to be copied by a high voltage power source applied from the high voltage supply unit (70). . A method for detecting a back surface of an electrophotographic copying machine, comprising: a first step of displaying a state of a copying machine and a copy mode main menu on a console when the electrophotographic copying power is applied; After the first process, the main processor comprises a second process of checking whether a backing paper detection menu is selected from the console; In the second step, when the backing paper detection menu is selected, a third step of checking whether the automatic copy menu is selected after displaying the automatic copy menu; In the third process, if the automatic copy menu is selected, while the main processor transfers the copy paper inserted in the tray to the copy position, a fourth process of checking the presence or absence of the back paper of the copy paper by a plurality of photosensors of the back paper detection unit and; In the fourth process, if it is detected that the supplied copy paper is the backing paper, the high voltage generating unit is turned off to cut off the power of the DTC, thereby automatically discharging the copy paper without copying, and then returning to the fourth process. and; In the fourth process, if the supplied copy paper is not a backing paper, the main processing unit performs copying after transferring the copy paper to the copying position, and then returns to the fourth process if the copying is not finished. ; In the third process, if the automatic copy menu is not selected, the main processor performs a plurality of photosensors of the back paper detecting unit to check whether the copy paper is on the back paper before transferring the copy paper inserted in the tray to the copy position. Process; In the seventh step, when it is detected that the supplied copy paper is a backing paper, the eighth process asks whether the copying paper is to be copied or discharged as it is on the backing paper; In the eighth step, if the discharge is selected, by turning off the high voltage generating unit to cut off the power of the DTC, the ninth step of automatically discharging without copying to the copy paper and returning to the seventh step; In the seventh step, if the supplied copy paper is not a backing paper, the main processor performs copying after transferring the copy paper to the copying position, and then returns to the seventh step if copying is not finished. ; And an eleventh step of copying an original as it is, without performing a back paper detection, if the back paper detection menu is not selected in the second step.