KR20220021435A - Security multifunction printer and its controller - Google Patents

Abstract

The present invention relates to a multifunction printer to control printing by detecting whether a security paper is present and, more specifically, to a security multifunction printer which detects whether a printing paper is a security paper to output a blank paper in the case of a plain paper and perform printing without omission of pages, and a control device thereof. According to the present invention, a multifunction printer prints an image transferred to a belt or OPC drum on paper passing between a transfer roller and a belt roller or paper passing between a transfer roller and the OPC drum. The multifunction printer comprises a security paper detection sensor and a control device. When the paper is determined as a plain paper by a signal input from the security paper detection sensor, the control device stops progress of the paper before being pinched between a transfer roller and a belt roller or between the transfer roller and an OPC drum after the paper is picked up by a pick-up roller, controls switching of the sensor to generate a recovery situation, so that an image transferred to an image transfer belt or OPC drum is erased, the paper is ejected, and printing is performed again from the page from which the image has been erased.

Description

Multifunction device for security and control device thereof

The present invention relates to a multifunction device for controlling printing by detecting the presence of security paper. In particular, a security multifunction device and its control device capable of detecting whether the printing paper is a security paper and outputting a blank paper in the case of plain paper and printing without omission of a page it is about In the present invention, a multifunction device includes not only a multifunction device that integrates the functions of a printer, a fax machine, a copier, and a scanner, but also a device that implements only individual functions of the printer, fax, copier, and scanner.

Recently, with the rapid development of the company, a security measure against document leakage of the company is required. ) by inserting a special material or using a special material, amorphous or similar amorphous (non-crystalline state or amorphous), magnetic material (alloy), nano-sized metal wire, magnetic resonance It refers to paper (paper) that uses a material of a material and resonates at a specific frequency to generate a signal that can distinguish the characteristics of the material.

The security paper is detected by an electromagnetic (EM) sensor. That is, when the soft magnetic material in the security paper approaches the AC magnetic field generated by the sensor, a change occurs in the AC magnetic field, and the high frequency spectrum generated by this change is detected to detect whether the security paper is present. The sensor includes a transmitting coil generating an alternating magnetic field, a receiving coil sensing a change in the alternating magnetic field generated by the transmitting coil, controlling the alternating magnetic field generated in the transmitting coil, and processing a signal received from the receiving coil It may include an electronic system that

Alternatively, the security paper may include a plurality of conductive fine metal pieces irregularly distributed throughout the paper. The fine metal pieces have conductivity and may be any type of metal as long as they generate an induced current in a magnetic field. The fine metal pieces scattered throughout the paper can be removed after printing to neutralize attempts to pass through the security gate. For example, the metal piece contained in the paper may have a size so fine that it is not easily identified by the user's naked eye. The security paper on which the conductive fine metal pieces are dispersed in this way induces an eddy current in the fine metal piece of the paper to which the primary magnetic field generated from the inductive sensor is fed, and the magnetic field generated secondary by this eddy current is It affects the primary magnetic field generated by the Tiv sensor and changes its strength. Accordingly, the inductive sensor transmits a security paper detection signal to a control device, which will be described later, according to whether or not there is a change in the strength of the magnetic field generated by the inductive sensor.

1 is a diagram for schematically explaining a direct transfer type multifunction device according to the prior art, and FIG. 2 is a view for explaining the background technology of the present invention in a belt transfer type multifunction device according to the prior art.

The process of printing paper in the laser multifunction device 1 is described with reference to FIGS. 1 and 2 . Once printing starts, the LSU (Laser Scanner Unit) or KCMY LED Head 50 fits the OPC drum according to the image to be laser printed. By irradiating the 70, an image is formed on the OPC drum 70, and the OPC drum 70 on which the image is formed comes into contact with the toner-adhered roller, and the OPC drum ( 70), the toner is attached only to the portion where the image (image) is formed.

In the case of the direct transfer method shown in Fig. 1, the OPC drum 70 and the paper transfer by contacting the paper entering between the OPC drum 70 and the paper transfer belt or the transfer roller to which the toner is attached. The toner attached to the OPC drum 70 moves to the paper fed to the paper transfer belt or the transfer roller by the potential difference between the belt or the transfer roller. In the case of the belt transfer method shown in FIG. 2 , the OPC drum and the image transfer belt 60 are in contact, and the OPC drum 70 is caused by a potential difference between the OPC drum 70 and the image transfer belt 60 . The toner attached to the image transfer belt 60 moves. For example, in the case of a color printer, each color toner is fed in the order such as Yellow (Y), Magenta (M), Cyan (C), Black (K) on the image transfer belt 60 or on the paper will move to For reference, the order of the colors may be different depending on the MFP manufacturer. The toner moved to the image transfer belt 60 comes into contact with the paper rising between the image transfer belt 60 and the transfer roller 15 while the image transfer belt 60 rotates. An image is formed on the paper 10 as the toner of the image transfer belt 60 moves to the paper 10 due to the potential difference between (15).

As the paper 10 on which the image is formed by the toner passes through the fuser 18, the toner is fused to the paper 10 by heat, thereby terminating the final printing process.

When explaining the operation of the multifunction device to which the security function is applied in the above-mentioned multifunction device 1, when plain paper is detected by the security paper detection sensor 20, a motor or clutch not shown is controlled to control the registration roller 13 ), when the door open signal, which is a signal generated when the door 19 is opened after stopping the paper, is turned off, the MFP 100 performs a recovery operation. By using the driving time to properly control the clutch to rotate the roller, the stationary paper is transferred and discharged. In the case of the belt transfer method, the operation of erasing the image on the image transfer belt 60 is performed in parallel.

In this prior art, depending on the printer 100, even if the door 19 open signal is turned off-on, the motor does not rotate at all or rotates very briefly to ensure enough time to eject the paper. In this case, inevitably, a method of directly driving the motor by adding a motor driving circuit is used. Even so, whether or not the motor rotates or the rotation time of the motor is determined depending on the temperature of the fuser 18 itself. There is a problem in that the paper cannot be discharged as the paper does not rotate or the motor does not rotate for a desired time. At this time, a method of driving the fuser 18 by controlling the temperature sensor of the fuser 18 may also be considered, but this is very dangerous because there is a possibility that it may lead to a fire.

The present invention has been devised to solve the above-mentioned problems. It detects whether the printing paper is security paper, ejects it if the printing paper is plain paper, and the printing proceeds continuously without omission of pages, and this operation can be performed stably and smoothly. An object of the present invention is to provide a multifunction device for security and a control device thereof.

The present invention provides a multifunction printer that prints an image transferred to a belt or OPC drum on paper that is passed between a transfer roller and a belt roller or paper that is passed between a transfer roller and an OPC drum, comprising: a security paper detection sensor; If the paper is judged to be plain paper by the signal input from the security paper detection sensor, after the paper is picked up by the pickup roller, the paper stops before being bitten between the transfer roller and the belt roller or between the transfer roller and the OPC drum. , a control device that controls to erase the image transferred to the image transfer belt or OPC drum by switching the sensor to create a recovery situation, eject the paper, and print again from the page from which the image has been erased; to provide.

Here, the multifunction printer is provided with a driving device including a registration roller for correcting skew of paper to be fed and a motor or clutch driving the registration roller between the pickup roller and the transfer roller, and the control device includes the transfer roller and the belt. Before the paper is bitten between the rollers or between the transfer roller and the OPC drum, the driving device can be controlled to stop the progress of the paper judged to be plain paper.

In addition, the control device switches and controls the door open sensor of the multifunction device to cause the printer engine controller to recognize that the door is opened and then closed to perform a recovery operation to erase the image transferred to the image transfer belt or OPC drum. there is.

Also, the controller may switch and control the sensors on the paper transport path so that the printer engine controller recognizes that there is no paper on the paper transport path.

In addition, after erasing the image transferred to the image transfer belt or OPC drum, the control device switches off the connection to the LSU or KCMY LED Head of the multifunction device to prevent image formation on the image transfer belt or OPC drum While discharging the paper determined as normal paper by controlling the printer engine controller to perform normal printing operation, switching control the exit sensor to stop the paper at the exit.

In addition, when the paper is stopped at the exit, the control device controls the on-switching of the connection to the LSU or KCMY LED Head of the multifunction device and controls the printer engine controller to perform a normal printing operation. The old paper is completely discharged, and if the next paper that is picked up by the pickup roller from the paper tray and transferred to the transport path is security paper, it can be controlled to print again from the page from which the image has been erased.

In addition, the present invention provides a multifunction printer for printing an image transferred to an OPC drum on paper that is passed between a transfer roller and an OPC drum, comprising: a security paper detection sensor; If the paper is judged to be plain paper by the signal input from the security paper sensor, the printer engine controls the off-switching so that the LSU or KCMY LED head of the multifunction device and the printer engine controller are not connected to prevent the image to be printed from being formed on the OPC drum. The controller controls the normal printing operation and discharges the paper judged as plain paper as blank paper, then switches the exit sensor to stop the paper at the exit, then discharges the stopped paper and starts again from the page where no image is formed on the OPC drum. It provides a security multifunction device including; a control device for controlling printing.

Here, when the paper is stopped at the exit, the control device performs a recovery operation by switching the door open sensor of the multifunction device so that the printer engine controller recognizes that the door is opened and closed, and then uses the LSU or KCMY LED Head. The connected switch is controlled by on-switching and the printer engine controller is controlled so that normal printing operation is performed, and the paper judged to be plain paper that has stopped being discharged is completely discharged, and is picked up from the paper tray by the pick-up roller and transferred to the conveying path. If the next paper to be printed is security paper, it can be controlled to print again from the page where no image is formed on the OPC drum.

In addition, the present invention can be separately installed in a multifunction printer that prints an image transferred to a belt or OPC drum on paper that is passed between the transfer roller and the belt roller or paper that is passed between the transfer roller and the OPC drum. A control apparatus comprising: switching a connection between a printer engine controller of a multifunction apparatus and a driving apparatus; switching a connection between the printer engine controller of the multifunction device and the door open sensor; switching a connection between the printer engine controller of the MFP and the sensors on the paper transport path; switching the connection between the printer engine controller of the multifunction device and the LSU or KCMY LED Head; switching of the connection between the printer engine controller of the MFP and the exit sensor; To provide a control device configured to simultaneously and/or sequentially and/or repeatedly perform switching of three or more connections.

Here, the multifunction device is provided with a driving device including a registration roller for correcting skew of paper to be fed and a motor or a clutch driving the registration roller between the pickup roller and the transfer roller, and the control device includes a printer engine controller and The connection between the drive units can be switched so that the paper stops running before it gets caught between the transfer roller and the belt roller or between the transfer roller and the OPC drum.

In addition, the control device may switch the connection between the printer engine controller of the multifunction device and the door open sensor so that the printer engine controller recognizes that the door is opened and then closed, so that the multifunction device can perform a recovery operation.

Also, the control device may switch the connection between the printer engine controller of the multifunction apparatus and the sensors on the paper transport path so that the printer engine controller recognizes that there is no paper on the paper transport path.

In addition, the control device may switch the connection between the printer engine controller of the multifunction device and the LSU or KCMY LED Head to form or not form an image with the OPC drum.

Also, the control device may switch the connection between the printer engine controller of the multifunction device and the exit sensor to stop the paper at the exit.

In the present invention, the switching may be implemented as separate hardware as illustrated in the drawings of the present invention, but it is preferable to be integrated into the control device and implemented by software. However, in the following description and drawings, a separate switch is indicated for convenience of description.

According to the present invention, it is possible to detect whether the printing paper is a security paper, eject it in the case of general paper and proceed with printing stably and smoothly.

According to the present invention, it is possible to discharge the plain paper while preventing the image from being formed on the plain paper.

According to the present invention, depending on the characteristics of the multifunction device, it is possible to discharge the paper when some operation of the driving unit does not satisfy the paper discharge condition during the recovery operation.

According to the present invention, plain paper can be discharged and printed without omission of pages.

1 is a diagram schematically illustrating a multifunction device according to the related art.
2 is a view for explaining the background of the present invention in a multifunction device according to the prior art.
3 is a view for explaining a multifunction device for security to which the present invention can be applied.
4 is a block diagram for explaining a multifunction device for security according to the present invention.
5 is a flowchart illustrating a method of controlling a multifunction device for security according to an embodiment of the present invention.
6 is a flowchart illustrating a method of controlling a multifunction device for security according to another embodiment of the present invention.

As described above, in the present invention, a multifunction device includes not only a multifunction device that integrates the functions of a printer, a fax machine, a copier, and a scanner, but also a device that implements only individual functions of the printer, fax, copier, and scanner. In general, multifunction devices indicate that all functions of a printer, fax machine, copier, and scanner can be implemented, but the present invention distinguishes whether the paper being fed is plain paper or security paper, and prints ( printing), so it may be understood to refer to a printer, fax machine, or copier, not a multifunction device. That is, even if it functions only as a printer or only as a copier, if the functions described below can be implemented in the present invention depending on the paper being fed, it will fall within the scope of the present invention. Otherwise, a general multifunction device that implements all of the above functions will of course fall within the scope of the present invention.

This type of general or commercial multifunction device is manufactured and sold by several manufacturers, and each manufacturer controls the operation of the multifunction device by its own firmware. The inventor of the present invention, through Korean patent applications 10-2017-0107167 and 10-2017-0107168, etc., a security paper detection sensor that can be installed in such a commercial multifunction device, and the paper fed by the detection value of the security paper detection sensor is a security paper A control device has been proposed that determines whether or not it is normal paper and controls the print job by switching the signal line of a commercial multifunction device according to the determination result. According to the above patent application technology proposed by the inventor of the present invention, a so-called 'firmware non-interlocking' type multifunction device is obtained, in which a commercial multifunction device prints only on security paper and does not print on plain paper. Multifunction devices of various models can be used as multifunction devices for security paper without changing the firmware. The above patent application technology is incorporated into the present invention, and the present invention is a further improvement thereof.

In addition, the inventor of the present invention has proposed in Korean Patent Application No. 10-2019-0138618 with respect to a belt transfer type multifunction device and a control method thereof, the contents of which are incorporated in the present invention, and the present invention is a further improvement thereof.

Hereinafter, the present invention will be described in detail through examples and drawings.

3 is a view for explaining a multifunction device for security to which the present invention can be applied, FIG. 4 is a block diagram for explaining a multifunction device for security according to the present invention, and FIG. 5 is a view for explaining a multifunction device for security according to an embodiment of the present invention. It is a flowchart for explaining a method for controlling a multifunction device, and FIG. 6 is a flowchart for explaining a method for controlling a multifunction device for security according to another embodiment of the present invention.

3 to 6 , the multifunction device 100 for security according to the present invention includes a security paper detection sensor 20 installed on the transport path of the paper 10 , and a value detected by the security paper detection sensor 20 . Includes a control device 30 that recognizes whether it is security paper or plain paper according to the Pick Up) and transported to the transport route, the security paper detection sensor 20 located on the transport route transmits the detected value to the control device 30 and the control device 30 compares it with a preset reference value to determine whether the security paper Recognize. According to a preferred embodiment, the control device 30 detects the security paper at a point in time when there is no corresponding paper 10 around the security paper detection sensor 20 while the paper 10 to be read is transferred on the transfer path. By comparing the first detected value detected by the sensor 20 and one or more second detected values sensed by the security paper detection sensor 20 for the paper 10 to be read on the transport path, the comparison value is If it exceeds the predetermined standard, it is read as security paper, and if it is below the predetermined standard, it is read as plain paper.

In the firmware non-interlocking method according to a preferred embodiment of the present invention, the security paper detection sensor 20 and the control device 30 may be provided as separate components from the existing hardware and firmware of the multifunction device, for example, the security paper detection sensor ( 20) can be installed at a predetermined position on the paper feeding path, and the control device 30, which can be installed at an appropriate location inside the multifunction device, includes various hardware and printers such as sensors, LSU or KCMY LED heads, doors, etc. inside the multifunction device. It may be provided between the engine controllers 40 . For example, in a commercial multifunction device, a specific sensor (for example, a sensor for detecting the position of paper on the paper feed path, such as an exit sensor to be described later) and the printer engine controller 40 are connected by a specific signal line. It can be configured such that a signal line connected to (30) and having the same standard is connected from the control device (30) to the printer engine controller (40). In the same way, the LSU or KCMY LED Head and the printer engine controller 40 in the commercial multifunction device have a corresponding data communication line connected by a specific data communication line from the printer engine controller 40 to the control device 30, and a data communication line of the same standard It can be configured to be connected from the control device 30 to the LSU or KCMY LED Head. In the same way, the door open sensor and the printer engine controller 40 are connected by a specific signal line in the commercial multifunction machine in the same way. The corresponding signal line is connected to the control device 30, and a signal line of the same standard is connected from the control device 30 to the printer engine controller 40 ) can be configured to be connected.

The control device 30 is characterized in that the above signal line or communication line is switched on/off. Since the control device 30 switches on/off the signal line or communication line between the hardware and the printer engine controller 40 in the middle in the commercial multifunction device, even though paper is detected by the exit sensor, the printer engine controller 40 ) may be determined that the paper is not detected, and even though print data is transmitted from the printer engine controller 40 to the LSU or KCMY LED Head, the LSU or KCMY LED Head may not receive the data, and the door may not be opened. In spite of this, the printer engine controller 40 may determine that the door is open.

Since numerous hardware is provided in the multifunction device and numerous signal lines or communication lines for connecting these hardware to the printer engine controller 40 are provided, an appropriate relay board is provided between the hardware and/or the printer engine controller 40 and the control device 30 . It is also possible to separately install a signal line or a communication line to connect a signal line or a communication line to be controlled among them through the control device 30 for switching control.

Hereinafter, the configuration and operation according to a preferred embodiment of the present invention will be described in detail by taking the belt transfer type laser MFP as an example.

The paper 10 is picked up by a pickup roller 11 from a paper tray 80 and transferred to a transport path through the feed roller 12 .

1) When the control device 30 determines that the paper 10 is plain paper by the signal input from the security paper detection sensor 20, the paper is transferred before the paper is bitten by the transfer roller 15 and the belt roller 16 A driving device 90 including a registration roller 13 for correcting paper skew and a clutch or motor driving the registration roller 13 is provided between the pickup roller 11 and the transfer roller 15 And, the operation of the driving device 90 may be controlled by the control device 30 . For example, by controlling the operation of the driving device 90 under the control of the control device 30, the rotation of the registration roller 13 is forcibly stopped to stop the paper feeding. This can likewise be achieved by the control device 30 switching on/off the signal line between the printer engine controller 40 and the driving device 90 .

In the direct transfer type multifunction printer, it can be controlled to stop the paper progress before the paper is caught between the transfer roller and the OPC drum.

2) Then, by controlling the door open sensor 21 by the control device 30 according to the present invention (or by switching the signal on/off) (in the description of the present invention described above or later, the sensor control means that the signal from the sensor is switched on/off) so that the printer engine controller 40 recognizes that the door 19 has been opened and closed even though the door is not actually opened or closed. When the printer engine controller 40 recognizes that the door 19 is opened and closed, the security multifunction device 100 performs a recovery operation by the printer engine controller 40. In this process, the image transfer belt (60) continues to rotate in the state where there is no paper 10 between the transfer roller 15 and the belt roller 16, so that the image (image) already transferred to the image transfer belt 60 is automatically It is erased by the belt cleaner 17, and at this time, by controlling the sensors on the paper transport path including the registration sensor 14 by the control device 30 according to the present invention (the signal It means to switch on/off), so that the printer engine controller 40 recognizes that there is no paper even though there is actually paper on the paper transport path. For example, in the case of the registration sensor 14, the control device 30 controls the output of all sensors on the paper transport path, including controlling the registration sensor switch 14-1 to be off. If the control is turned off, the printer engine controller 40 determines that there is no paper even though there is paper in the multifunction device 100 for security, and the recovery operation proceeds.

In the direct transfer type multifunction device, the image formed on the OPC drum during the recovery operation will be erased by the drum cleaner.

3) As described above, even though the door is not actually opened or closed, the printer engine controller 40 recognizes that the door 19 has been opened and closed, so that the security multifunction device 100 is operated by the printer engine controller 40 After performing the recovery operation, the control device 30 controls the printer engine controller 40 to attempt to perform normal printing. At this time, the plain paper is still stopped at the registration roller 13 . That is, the control device 30 according to the present invention controls the switch 50-1 connected to the LSU or KCMY LED Head to be off, thereby preventing the image (image) from being formed on the image transfer belt 60 . By controlling the printer engine controller 40 to perform a normal printing operation, the general paper is transferred so that printing is not performed on the plain paper. Print data from the printer engine controller 40 was transmitted to the LSU or KCMY LED Head through the communication line, but the print data was not transmitted to the LSU or KCMY LED Head due to on/off switching of the control device 30, so the OPC drum ( Even if the corresponding image is not formed in 70), the printer engine controller 40 determines that the corresponding image is printed.

4) As described above, before the plain paper is transferred and the plain paper is discharged, the control device 30 controls the exit sensor 22 to stop the operation of the multifunction device 100 for security, so that the plain paper exits. It stops just before exiting the roller (Exit Roller) (23). For example, just before the general paper is discharged, the control device 30 controls the output from the exit sensor 22 to be off, so that even though the exit sensor 22 actually detects the paper, the printer engine controller 40 It is possible to stop the operation of the multifunction device 100 for security by allowing the exit sensor 22 to recognize that the paper has not been detected. Thereafter, the control device 30 controls the switch 24 connected to the LSU or KCMY LED Head to be on, and controls the printer engine controller 40 to perform a normal printing operation, immediately before exiting the exit roller 23 . The general paper stopped at In the case of paper, printing starts again from the page from which the image (image) has been erased due to plain paper.

In the above steps 1), 2), 3), and 4), each step may be selectively performed or some of each step may be selectively performed, and the order of these steps may be changed in some cases.

Hereinafter, the configuration and operation according to another preferred embodiment of the present invention will be described in detail. Another preferred embodiment of the present invention is a direct transfer method in which the toner attached to the OPC drum 70 is directly moved to the paper 10 raised by the transfer roller 15 to form an image on the paper 10 . It can also be applied to the multifunction device of

The paper 10 is picked up from the paper tray 80 by the pickup roller 11 and transferred to the conveying path through the feed roller 12 .

1) When the control device 30 determines that the paper 10 is plain paper by the signal input from the security paper detection sensor 20, the control device 30 includes the LSU or KCMY LED Head 50 and the printer engine controller ( 40) is controlled so that the on/off switching is not connected so that the image to be printed is not formed on the OPC drum 70, for example, the LSU switch or the KCMY LED Head switch 50-1 is controlled to be off to control so that the image to be printed is not formed on the OPC drum 70 . The print data from the printer engine controller 40 was transmitted to the LSU or KCMY LED Head 50 through the communication line, but the print data was transferred to the LSU or KCMY LED Head 50 by on/off switching of the control device 30 . Even if the image is not formed on the OPC drum 70 because it is not transmitted, the printer engine controller 40 determines that the image is printed.

2) Just before the plain paper is discharged, the control device 30 controls the exit sensor 22 to stop the operation of the multifunction device 100 for security, so that the plain paper moves the exit roller 23 . It stops right before it exits. For example, just before the general paper is discharged, the control device 30 controls the output from the exit sensor 22 to be off, so that even though the exit sensor 22 actually detects the paper, the printer engine controller 40 exits. By making the sensor 22 recognize that the paper is not detected, the operation of the multifunction device 100 for security may be stopped. Thereafter, the control device 30 controls the on/off switching of the door open sensor 21 so that the printer engine controller 40 recognizes that the door is opened and closed even though the door is not actually opened or closed, and recovery (Recovery) ), the switch 50-1 connected to the LSU or KCMY LED Head is turned on, and the printer engine controller 40 is controlled to perform a normal printing operation so that the exit roller 23 is removed. The plain paper that stopped just before coming out is discharged, and the next paper 10 is picked up by the Pick Up Roller 11 from the Paper Tray 80 and transferred to the transport path, and the next paper If is a security paper, printing starts again from the page where no image (image) is formed on the OPC drum.

As described above, the printer engine controller 40 determined that the image to be printed on plain paper was printed in step 1), but determined that the plain paper was not detected by the exit sensor 22 in step 2), so that the corresponding plain paper It is determined that the door is opened and then closed while being hung on the exit roller 23, and a recovery operation is performed. After the recovery operation, the image of the paper that was not ejected properly is printed again, so that the print operation can proceed on the next paper without omission of a page.

As described above, in the present invention, the security paper detection sensor 20 and the control device 30 are not provided in the commercial multifunction device, but are installed separately, and are also installed separately in several devices in the multifunction device including the sensor through several switches installed separately. It controls the printing operation of commercial multifunction devices by switching signal lines or communication lines between hardware (including various sensors, LSUs, and printer engine controllers). As a result, a commercial multifunction device functions as a security multifunction device by applying the present invention.

The present invention is not limited to the specific preferred embodiments described above, and various modifications are possible by anyone with ordinary skill in the art to which the invention pertains without departing from the gist of the invention as claimed in the claims. Of course, such modifications are intended to be within the scope of the claims.

100: multifunction device for security
10: paper
20: security paper detection sensor
30: control device
40: printer engine controller
50: LSU or KCMY LED Head
50-1: LSU switch or KCMY LED Head switch
60: Image Transfer Belt
70: OPC drum
80: paper tray
90: drive
1: All-in-one
11: Pickup roller
12: feed roller
13: registration roller
14: registration sensor
14-1: Registration sensor switch
15: transfer roller
16: belt roller
17: belt cleaner
18: fuser
19: door
21: door open sensor
21-1: door open sensor switch
22: exit sensor
22-1: Exit sensor switch
23: exit roller

Claims (14)

In a multifunction printer that prints an image transferred to a belt or OPC drum on paper that is passed between a transfer roller and a belt roller or paper that is passed between a transfer roller and an OPC drum,
a security paper detection sensor;
If the paper is judged to be plain paper by the signal input from the security paper detection sensor, after the paper is picked up by the pickup roller, before being bitten between the transfer roller and the belt roller or between the transfer roller and the OPC drum, the progress of the paper is stopped. , a control device that controls to erase the image transferred to the image transfer belt or OPC drum by switching the sensor to create a recovery situation, eject the paper, and print again from the page from which the image has been erased; characterized in that it comprises a All-in-one for security. According to claim 1,
The multifunction device is provided with a driving device including a registration roller for correcting skew of the fed paper and a motor or clutch driving the registration roller between the pickup roller and the transfer roller,
The control device controls the driving device before the paper is bitten between the transfer roller and the belt roller or between the transfer roller and the OPC drum to stop the progress of the paper determined as plain paper. According to claim 1,
The control device controls the door open sensor of the multifunction device to switch, so that the printer engine controller recognizes that the door has been opened and closed, so that the recovery operation is performed to erase the image transferred to the image transfer belt or OPC drum. multifunction device for security. 4. The method of claim 3,
The control device switches and controls sensors on the paper transport path so that the printer engine controller recognizes that there is no paper on the paper transport path. According to claim 1,
After erasing the image transferred to the image transfer belt or OPC drum, the control device switches off and controls the connection to the LSU or KCMY LED Head of the multifunction device to prevent image formation on the image transfer belt or OPC drum. A security multifunction device, characterized in that the engine controller controls the normal printing operation to discharge the paper determined as normal paper, and then switches the exit sensor to stop the paper at the exit. 6. The method of claim 5,
When the paper is stopped at the exit, the control device controls the on-switching of the connection to the LSU or KCMY LED Head of the multifunction device and controls the printer engine controller to perform normal printing operation. is completely discharged, and if the next paper picked up by the pickup roller from the paper tray and transferred to the transport path is security paper, it controls to print again from the page from which the image has been erased. In the multifunction printer, the image transferred to the OPC drum is printed on paper that is interposed between the transfer roller and the OPC drum,
a security paper detection sensor;
If the paper is judged to be plain paper by the signal input from the security paper sensor, the printer engine controls the off-switching so that the LSU or KCMY LED Head of the multifunction device and the printer engine controller are not connected to prevent the image to be printed from being formed on the OPC drum. The controller controls the normal printing operation and discharges the paper judged as plain paper as blank paper, then switches the exit sensor to stop the paper at the exit, then discharges the stopped paper and starts again from the page where no image is formed on the OPC drum. Security multifunction device comprising a; a control device for controlling printing. 8. The method of claim 7,
When the paper is stopped at the exit, the control device switches the door open sensor of the multifunction device so that the printer engine controller recognizes that the door has been opened and closed so that the recovery operation is performed, and then connected to the LSU or KCMY LED Head By controlling the switch on switching and controlling the printer engine controller to perform normal printing operation, the paper judged to be plain paper that has stopped being discharged is completely discharged, and is picked up by the pickup roller from the paper tray and transferred to the transport path. Security multifunction device, characterized in that when the paper is security paper, it controls to reprint the page from which no image is formed on the OPC drum. As a control device that can be separately installed in a multifunction device that prints an image transferred to a belt or OPC drum on paper that is passed between the transfer roller and the belt roller or paper that is passed between the transfer roller and the OPC drum,
switching a connection between the printer engine controller and the driving device of the multifunction device;
switching a connection between the printer engine controller of the multifunction device and the door open sensor; switching a connection between the printer engine controller of the MFP and the sensors on the paper transport path;
switching the connection between the printer engine controller of the multifunction device and the LSU or KCMY LED Head;
switching of the connection between the printer engine controller of the MFP and the exit sensor; A control device, characterized in that it is configured to simultaneously and/or sequentially and/or repeatedly perform switching of three or more connections. 10. The method of claim 9,
The multifunction device is provided with a driving device including a registration roller for correcting skew of the fed paper and a motor or clutch driving the registration roller between the pickup roller and the transfer roller,
and the control device is capable of switching the connection between the printer engine controller and the driving device to stop the progress before the paper is caught between the transfer roller and the belt roller or between the transfer roller and the OPC drum. 10. The method of claim 9,
The control device, characterized in that by switching the connection between the printer engine controller and the door open sensor of the multifunction device, the printer engine controller recognizes that the door is opened and closed, so that the multifunction device can perform a recovery operation. 10. The method of claim 9,
and the control device is capable of causing the printer engine controller to recognize that there is no paper on the paper transport path by switching a connection between the printer engine controller of the multifunction device and the sensors on the paper transport path. 10. The method of claim 9,
The control device, characterized in that the control device can switch the connection between the printer engine controller of the multifunction device and the LSU or KCMY LED Head to form or not form an image with the OPC drum. 10. The method of claim 9,
and the control device is capable of stopping the paper at the exit by switching a connection between the printer engine controller of the multifunction device and the exit sensor.

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