JP2015046767A - Facsimile device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a device cannot respond within a preset number of ringing when a call is incoming in an energy-save mode.SOLUTION: A time T required from incoming of a calling signal until a ringing number of the calling signal reaches a predefined ringing number is stored in a ROM 314. In the energy-save mode, when a sub-CPU 323 detects incoming of the calling signals via an incoming call detection section 321, it stores a detection time T1 in an incoming signal detection information storing section 322, outputs a restoration instruction signal to an energy-save managing section 15, and causes restoration to a normal mode. When the normal mode is restored, the main CPU 313 controls a connection switch section 30 to output the calling signal from the public line network 5 to a modem/calling signal detection section 312, measures a time based on a time obtained by subtracting the detection time T1 stored in the incoming signal detection information storing section 322 from a restoration time T2 at which the normal mode is restored, and performs an off-hook operation when the measured time reaches the required time T stored in the ROM 314.

Description

  The present invention relates to a facsimile apparatus having an energy saving mode.

  Conventionally, when there is an incoming call, a call signal is sent from a public line network to a facsimile machine via a telephone line. A telephone is connected to the telephone line, and the telephone rings according to the ringing pattern of the ringing signal to notify the incoming call. In a facsimile machine equipped with an automatic reception function, when an incoming call is detected, the control unit that controls the incoming call counts the number of rings, and when the number of rings reaches a preset number of rings, it automatically goes off-hook. Starts facsimile reception.

  Some facsimile apparatuses have an energy saving (hereinafter referred to as energy saving) mode that operates with reduced power consumption when the facsimile function is not used. Normally, in the energy saving mode, the control unit for controlling incoming calls is in a sleep state, and only the function for detecting the incoming call from the public line network and returning the control unit from the sleep state is operating. For this reason, there has been proposed a technique for controlling the telephone so as not to ring when a call signal is transmitted from the public line network during the energy saving mode (see, for example, Patent Documents 1 to 3).

  When an incoming call is detected in the energy saving mode, the control unit that controls the incoming call returns from the sleep state and starts counting the number of rings. For this reason, the number of ringing until the control unit returns after the incoming call is detected is not counted, and the ringing is performed more than the predetermined number of ringing set in advance. Therefore, various techniques for preventing this have been proposed.

  For example, there is a ring control unit that rings the telephone by a pseudo bell signal generated in response to the ringing signal. In the normal mode, the main control unit controls the ring control unit to ring the telephone a specified number of times, and in energy saving mode And during energy saving recovery, a technology has been proposed in which the sub-control unit controls the ringing control unit instead of the main control unit to ring the telephone a specified number of times (for example, see Patent Document 4).

JP 2001-309077 A Japanese Patent Laying-Open No. 2005-086755 JP 2002-344657 A JP 2013-005037 A

  However, in the technique disclosed in Patent Document 4, it is necessary to provide a ringing device, which is costly.

  The present invention has been made in view of the above problems, and an object thereof is to provide a technique for solving the above problems.

The facsimile apparatus of the present invention includes a sub-control unit that detects the arrival of a call signal sent from the public line network in the energy saving mode and returns the main control unit to the normal mode, and the call after the call signal arrives. Storage means for storing the time required for the number of ringing of a signal to reach a preset number of ringing preset, and after returning to the normal mode, the sub-control unit detects the ringing signal and then returns to the normal mode. A main control unit having a main control unit that measures time based on an elapsed time required until the measurement time and goes off-hook when the measurement time reaches the required time stored in the storage unit. Features.
Further, when the main control means detects an incoming call signal sent from the public network during the normal mode, the main control means counts the number of ringing of the ringing signal, and the count value reaches the predetermined number of ringing preset. You may go off-hook.
Further, the main control unit may calculate the required time by ringing time of ringing cycle of ringing signal + ringing cycle × (specified number of ringing times−1) and store it in the storage means.
Further, the sub-control unit has an incoming call detection information storage means for storing a detection time when the incoming call signal is detected, and the main control means is configured to return the return time acquired when returning to the normal mode from the return time. A time obtained by subtracting the detection time stored in the incoming call detection information storage means may be the elapsed time.
Further, the sub-control unit has an incoming detection information storage means for storing a detection time when the incoming call signal is detected, and the acquisition is performed when the acquisition request for the elapsed time is notified from the main control unit. A time obtained by subtracting the detection time stored in the incoming call detection information storage unit from the time when the request is notified may be notified to the main control unit as the elapsed time.
Further, the sub control unit measures a time from when the incoming call signal is detected to when the main control unit notifies the elapsed time acquisition request, and acquires the elapsed time from the main control unit. When the request is notified, the measured time may be notified to the main control unit as the elapsed time.

  ADVANTAGE OF THE INVENTION According to this invention, when there exists an incoming call in energy saving mode, without providing a ringing apparatus etc., the technique which can respond with the frequency | count of the preset number of times can be provided.

1 is a block diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. It is an example of the ringing pattern of the call signal memorize | stored in ROM of the main control unit shown in FIG. It is a circuit block diagram which shows the connection aspect of the connection switching part shown in FIG. It is a flowchart which shows the flow of the process which calculates the required time T in the fax board shown in FIG. It is an image figure which shows the required time T shown in FIG. 3 is a flowchart showing a flow of processing when the fax board shown in FIG. 1 detects an incoming call during a normal mode. It is a flowchart which shows the flow of a process when the fax board shown in FIG. 1 shifts from a normal mode to an energy saving mode and detects an incoming call during the energy saving mode.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that, in the following embodiments, the same reference numerals are given to configurations showing similar functions.

  As shown in FIG. 1, the image forming apparatus 100 is an MFP (Multifunction Printer) having a scanner function, a copying function, a printing function, a facsimile function, and the like. Note that the image forming apparatus 100 may simply be a facsimile apparatus having a facsimile function.

  The main controller 1 of the image forming apparatus 100 includes an operation panel unit 10, an image reading unit 11, a storage unit 12, a printing unit 13, a communication unit 14, an energy saving management unit 15, a power control unit 16, a RAM 17, a ROM 18, and a CPU 19. Is provided.

  The operation panel unit 10 includes a display unit provided with a transparent pressure-sensitive sensor on the surface of the liquid crystal display panel, a touch panel functioning as an input unit, a numeric keypad for inputting numerical values such as the number of printed sheets, and an instruction to initialize setting information. Reset key to input, Stop key to stop the copying operation or erase the entered numerical value, Interrupt key to instruct the interrupt copy, Start to input the output instruction to start the printing operation It is a user interface provided with various operation keys such as keys.

  The image reading unit 11 emits light to a document fed by a document feeder (not shown) or a document placed on a platen glass by a user, and receives reflected light or the like to form a document image. It is a scanner that reads.

  The storage unit 12 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and image data read by the image reading unit 11 or image data received from an external terminal (not shown) via the communication unit 14. Is a storage means for accumulating.

  The printing unit 13 is a printing unit that prints the image data stored in the storage unit 12. For example, the printing unit 13 forms a latent image on the surface of the photosensitive drum based on the image data read from the storage unit 12, performs image formation using the latent image as a toner image with toner, and records from the photosensitive drum. The toner image is transferred onto the paper, and the toner image is fixed onto the recording paper and discharged.

  The communication unit 14 has a function of transmitting and receiving various data to and from an external terminal (not shown) via a network such as a LAN (Local Area Network).

  The energy saving management unit 15 manages the energy saving state of each part of the image forming apparatus 100 and sets the operation mode of each part to the normal mode or the energy saving mode. In the normal mode, the image forming apparatus 100 operates in a state where processing can be performed immediately. In the energy saving mode, the image forming apparatus 100 operates in a state where power consumption is suppressed as compared with the normal mode. For example, in the fax board 3, when the operation panel unit 10 is not operated for a predetermined time in the normal mode, the energy saving management unit 15 shifts the operation mode of the fax board 3 from the normal mode to the energy saving mode. At that time, the energy saving management unit 15 notifies the fax board 3 of the energy saving transition so as to correspond to the energy saving mode transition. Further, when a return command signal is notified from a sub CPU 323 described later when the fax board 3 is in the energy saving mode, the energy saving management unit 15 shifts the operation mode of the fax board 3 from the energy saving mode to the normal mode. The energy saving management unit 15 may manage the energy saving state so that the operation mode of the entire image forming apparatus 100 is set to the energy saving mode or the normal mode instead of each part of the image forming apparatus 100.

  The power control unit 16 controls the power of each unit connected to the CPU 19 and the CPU 19 according to the operation mode of each unit of the image forming apparatus 100. For example, in the normal mode, power from the commercial power supply (not shown) is supplied to the fax board 3 by the power supply control unit 16 so that the fax board 3 can be immediately received by facsimile. On the other hand, in the energy saving mode, the power control unit 16 reduces the power supply power supplied to the fax board 3 so that the fax board 3 enters a sleep state.

  The CPU 19 is connected to the operation panel unit 10, the image reading unit 11, the storage unit 12, the printing unit 13, the communication unit 14, the energy saving management unit 15, the power supply control unit 16, the RAM 17, the ROM 18, and the fax board 3. The entire image forming apparatus 100 is controlled in accordance with predetermined instruction information input from 10. A ROM (Read Only Memory) 18 stores a control program for controlling the operation of the image forming apparatus 100. The CPU 19 reads out a control program stored in the ROM 18 and develops the control program in a RAM (Random Access Memory) 17 to control the entire apparatus.

  In addition to the above, the CPU 19 may be connected to an image processing unit that performs predetermined image processing on the image data. In the image processing unit, for example, image improvement processing such as enlargement / reduction processing, density adjustment, and gradation adjustment is performed.

  The fax board 3 is connected to the main controller 1 via the USB control 2 so as to be able to transmit and receive data to and from the main controller 1. The fax board 3 includes a connection switching unit 30, a main control unit 31, and a sub control unit 32, and functions as a facsimile transmission / reception unit.

  The connection switching unit 30 is connected to the modem / calling signal detection unit 312 of the main control unit 31, the incoming call detection unit 321 of the sub control unit 32, the external telephone 4, and the public line network 5. The connection switching unit 30 is controlled by the main CPU 313 of the main control unit 31 and selectively switches the connection of the telephone line 51 of the public line network 5 between the external telephone 4 and the modem / calling signal detection unit 312 in the normal mode. In the energy saving mode, the connection of the telephone line 51 of the public line network 5 is selectively switched between the external telephone 4 and the incoming call detection unit 321.

  The main control unit 31 operates when the fax board 3 is in the normal mode, and enters the sleep state in the energy saving mode. The main control unit 31 includes a clock unit 311, a modem / calling signal detection unit 312, a main CPU 313, a ROM 314, and a RAM 315.

The clock unit 311 has a function of outputting current date information.
The modem / calling signal detector 312 includes a modem. The modem / call signal detection unit 312 is connected to the connection switching unit 30 and detects a call signal transmitted from the public network 5 and is stored in the image data read by the image reading unit 11 or the storage unit 12. A facsimile transmission function for generating a facsimile signal from the received image data and transmitting the facsimile signal via the public line network 5 and a facsimile reception function for receiving the facsimile signal via the public line network 5.

  The main CPU 313 is connected to the clock unit 311, the modem / calling signal detection unit 312, the ROM 314, the RAM 315, the sub CPU 323, and the connection switching unit 30, and executes the operation control of the entire fax board 3. The ROM 314 stores a control program for controlling the operation of the fax board 3. The main CPU 313 reads the control program stored in the ROM 314 and develops the control program in the RAM 315 to control the entire fax board 3.

  In addition, the ROM 314 stores ringing patterns of calling signals for each destination shown in Table 1. As shown in Table 1, the ringing pattern of the call signal is predetermined for each country (by destination). For example, in Japan, as shown in FIG. 2, the call signal is 75V, 16 Hz, and is configured by periodically repeating a ringing pattern of turning on (ringing) for 1 second and turning off (pause) for 2 seconds. In the present embodiment, description will be made assuming that the destination of the image forming apparatus 100 is Japan.

  The main CPU 313 receives the call signal during the energy saving mode when the destination and the specified number of ringing N, which is the number of ringing of the calling signal until the start of automatic facsimile reception, are set via the operation panel unit 10. The required time T from the detection to the off-hook is calculated, and the required time T is stored in the ROM 314. At that time, the destination set via the operation panel unit 10 and the specified number of ringings N are also stored in the ROM 314. A method for calculating the required time T will be described later. Note that the required time T is shorter than the time corresponding to the preset number N of predetermined ringing. In addition, the specified ringing number N is described as a fixed value set by the user via the operation panel unit 10, but may be a fixed value set in advance by a program.

  When the energy saving management unit 15 notifies the energy saving transition, the main CPU 313 controls the connection switching unit 30 to connect the telephone line 51 of the public line network 5 to the external telephone 4 and the modem / calling signal detecting unit 312. The connection configuration in the normal mode is selectively switched to the connection configuration in the energy saving mode in which the connection of the telephone line 51 of the public line network 5 is selectively switched between the external telephone 4 and the incoming call detection unit 321. At the same time, the main CPU 313 activates the sub control unit 32 and requests the sub CPU 323 to return the fax board 3 to the normal mode when the incoming call signal from the public line network 5 is detected. Thereafter, the power consumption supplied to the fax board 3 by the power control unit 16 is reduced, and the power of the main control unit 31 is turned off while the power is supplied to the sub control unit 32, so that the fax board 3 sleeps. It becomes a state.

  When the sub CPU 323 detects an incoming call signal from the public line network 5 via the incoming call detection unit 321, the energy saving management unit 15 shifts the fax board 3 from the energy saving mode to the normal mode, and the power supply control unit 16 performs the main operation. The power of the control unit 31 is turned on, and the main control unit 31 returns from the sleep state and starts in the normal mode.

  The restored main CPU 313 controls the connection switching unit 30 to selectively switch the connection of the telephone line 51 of the public line network 5 between the external telephone 4 and the incoming call detection unit 321 from the connection configuration of the energy saving mode to the public line. The connection of the telephone line 51 of the network 5 is switched to the normal mode connection configuration that selectively switches the connection between the external telephone 4 and the modem / calling signal detection unit 312.

  When the main CPU 313 returns to the normal mode, the main CPU 313 acquires the return time T2 at the time of return from the clock unit 311 and the detection time T1 when the call signal is detected from the sub CPU 323 and stores the required time stored in the ROM 314. Time T is acquired. Subsequently, the main CPU 313 determines whether the time measured by the timer has reached the required time T based on the time obtained by subtracting the detection time T1 from the return time T2.

  When the required time T is reached, the main CPU 313 controls the connection switching unit 30 to switch the connection destination of the telephone line 51 from the external telephone 4 to the modem / calling signal detection unit 312 and goes off-hook to start facsimile reception. The main CPU 313 counts the number of ringing of the calling signal when detecting the arrival of the calling signal via the modem / calling signal detecting unit 312 during the normal mode, and goes off-hook when the count value reaches the specified number of ringing N. The facsimile reception is started.

  The sub-control unit 32 is provided for detecting the arrival of a call signal from the public line network 5 instead of the main control unit 31 in the energy saving mode, and returning the fax board 3 to the normal mode. The sub-control unit 32 is powered off by the power control unit 16 when the fax board 3 is in the normal mode and stopped, and activated when the power control unit 16 is powered on in the energy saving mode. The sub control unit 32 includes an incoming call detection unit 321, an incoming call detection information storage unit 322, and a sub CPU 323.

  The incoming call detection unit 321 detects an incoming call signal sent from the public line network 5 via the connection switching unit 30.

  The incoming call detection information storage unit 322 is configured by a semiconductor memory, a latch circuit, or the like, and is a storage unit that stores a detection time T1 when the incoming call detection unit 321 detects an incoming call signal.

  The sub CPU 323 is configured by a one-chip microcomputer or the like, and is connected to the incoming call detection unit 321, the incoming call detection information storage unit 322, the main CPU 313, and the energy saving management unit 15. The sub CPU 323 controls the entire sub control unit 32 by developing a control program stored in a ROM (not shown) in a RAM (not shown). When the sub CPU 323 detects an incoming call signal via the incoming call detection unit 321, it outputs a return command signal to the energy saving management unit 15 of the main controller 1 to return the fax board 3 to the normal mode. Further, the sub CPU 323 acquires a detection time T1 when the incoming call signal is detected via a clock unit (not shown), and stores the detection time T1 in the incoming detection information storage unit 322.

  Next, the connection mode of the connection switching unit 30 will be described with reference to FIG.

  Terminals L <b> 1 and L <b> 2 are connected to each of a two-wire telephone line 51 from the public line network 5. The terminal L1 is connected to a connection point c1 of the line relay 303 via a current detection unit (off-hook detection unit) 301 that detects off-hook. Terminal L2 is connected to connection point c2 of line relay 303.

  In the external telephone 4, one line is connected between the current detection unit 301 and the connection point c1 of the line relay 303 via the first relay 302, and the other line is a connection point between the terminal L2 and the line relay 303. Connected between c2. The first relay 302 is closed in an incoming call waiting state for waiting for an incoming call.

  One end of the primary side terminal of the transformer T1 is connected to the connection point a1 of the line relay 303 via the capacitor C1 connected in series, and the other end of the primary side terminal of the transformer T1 is connected to the connection point of the line relay 303. a2 is connected. A modem / calling signal detector 312 is connected to the secondary side terminal of the transformer T1.

  A second relay 304 is provided between the connection point a1 of the line relay 303 and one end of the primary side terminal of the transformer T1 so as to bypass the capacitor C1. The second relay 304 is open in the incoming call waiting state.

  One end of the primary side terminal of the transformer T2 is connected to the connection point b1 of the line relay 303, and the other side of the primary side terminal of the transformer T2 is connected to the connection point b2 of the line relay 303 via the capacitor C2 connected in series. The ends are connected. An incoming call detection unit 321 is connected to the secondary terminal of the transformer T2.

  In the energy saving mode, when a call signal is input from the public line network 5 to the terminals L1 and L2, the call signal is input to the line relay 303 via the current detection unit 301. Since the first relay 302 is closed in the incoming call waiting state, a call signal is also input to the external telephone 4 and the external telephone 4 rings according to the call signal.

  In the line relay 303, in the energy saving mode, the connection point c1 and the connection point c2 are respectively connected to the connection point b1 and the connection point b2, and the call signal input from the connection point c1 and the connection point c2 is received by the incoming call detection unit 321. Output to the side. In the capacitor C2, the direct current component is blocked and the alternating current component passes, so that the ringing signal, which is an alternating current pulse signal, is input to the incoming call detection unit 321 via the capacitor C2 and the transformer T2.

  When the incoming call detection unit 321 detects the incoming call signal, the main control unit 31 returns from the sleep state, and the connection destinations of the connection point c1 and the connection point c2 are the connection point b1 and the connection point b2 in the line relay 303, respectively. To the connection point a1 and the connection point a2. As a result, the call signal from the public network 5 is output to the modem / call signal detection unit 312 side, passes through the capacitor C1, and is input to the modem / call signal detection unit 312 via the transformer T1.

  When an incoming call signal is detected by the incoming call detection unit 321 in the energy saving mode, the main CPU 313 determines whether the required time T has been reached after the incoming call signal detection unit 321 detects the incoming call signal. When the required time T is reached, the first relay 302 is opened and the second relay 304 is closed, and the terminals L1 and L2 are closed to form a DC loop (off-hook). . The external telephone 4 is disconnected from the telephone line 51 when the first relay 302 is opened, and stops ringing. When the incoming call signal is detected by the modem / calling signal detection unit 312 during the normal mode, the main CPU 313 counts the number of ringing of the calling signal detected by the modem / calling signal detection unit 312 and the count value is When the specified ringing number N is reached, it is off-hooked.

  When the DC loop is formed, a DC loop current is detected in the public line network 5 to stop sending the calling signal, and a facsimile signal is sent from the public line network 5. The facsimile signal input through the terminals L1 and L2 is output to the modem / calling signal detection unit 312 through the line relay 303, and the modem / calling signal detection unit 312 starts the facsimile reception operation.

  When the facsimile signal is not sent from the public line network 5, the second relay 304 is opened and the first relay 302 is closed, and the modem / call signal detection unit 312 and the telephone line 51 are connected. Is disconnected, the telephone line 51 and the external telephone 4 are connected, and the answering machine function of the external telephone 4 operates.

A processing flow of the fax board 3 for the image forming apparatus 100 having the above-described configuration will be described.
First, the flow of processing in which the main CPU 313 calculates the required time T will be described with reference to FIG. It is assumed that the destination and the specified number of ringings N are set in advance in the image forming apparatus 100 when delivered.

  The main CPU 313 determines whether a destination is set via the operation panel unit 10 (step s101). If the destination is not set, the main CPU 313 waits until the destination is set (No in step s101). When the destination is set (Yes in step s101), the main CPU 313 determines whether or not the specified number of rings N that is the number of rings until the start of automatic facsimile reception is set via the operation panel unit 10 (step s102). . If the specified ringing number N is not set, the main CPU 313 waits until the specified ringing number N is set (No in step s102). When the specified ringing number N is set (Yes in step s102), the main CPU 313 refers to the ROM 314 and acquires the ringing pattern of the set destination call signal (step s103).

  Subsequently, the main CPU 313 calculates a time T required for counting the number of ringing of the calling signal for the set destination N times (specified number of ringing N) (step s104).

  Specifically, as shown in FIG. 5, the main CPU 313 calculates the required time T = t2 (N−1) + t1 and acquires the required time T. Here, t1 is a ringing signal ON (ringing) time for one ringing ring pattern. T2 is the ringing cycle of the call signal. N is the specified ringing number N.

  For example, suppose that Japan is set as the destination and four times is set as the specified ringing number N. Since the Japanese calling signal is a ringing pattern that is turned on for 1 second and turned off for 2 seconds, the required time T = 3 × (4-1) +1, and the required time T = 10 seconds is calculated.

  After calculating the required time T, the main CPU 313 stores the required time T in the ROM 314 (step s105) and ends this process.

  Next, the flow of processing when the fax board 3 detects an incoming call during the normal mode will be described with reference to FIG. Here, since it is the normal mode, the main control unit 31 is activated, the sub control unit 32 is stopped, and the line relay 303 is switched to the main control unit 31 side.

  The main CPU 313 waits until the modem / calling signal detection unit 312 detects the arrival of the calling signal (No in step s11). When the incoming call signal is detected (Yes in step s11), the main CPU 313 stores the incoming call signal in the ROM 314. The stored predetermined ringing number N is acquired (step s12). Subsequently, the main CPU 313 sets “0” to n, which is a variable for counting the number of rings (step s13), and determines whether n ≧ N (step s14).

  When n ≧ N is not satisfied (No in step s14), the main CPU 313 determines whether one period of the ringing pattern of the call signal has been detected via the modem / call signal detection unit 312 (step s15).

  When one ringing pattern period is not detected (No in step s15), the main CPU 313 returns to the process of determining whether n ≧ N (step s14). If one ring pattern period is not detected, the main CPU 313 may wait until one ring pattern period is detected and determine whether one ring pattern period has been detected (step s15). When one ringing pattern period is detected (Yes in step s15), the main CPU 313 increments n (step s16) and returns to the process of determining whether n ≧ N (step s14).

  When n ≧ N (Yes in step s14), the number of ringing of the calling signal has reached the specified number of ringing N, so the main CPU 313 goes off-hook (step s17) and ends this process. Thereafter, the modem / call signal detection unit 312 starts facsimile reception processing.

  Next, a flow of processing when the fax board 3 shifts from the normal mode to the energy saving mode and detects an incoming call during the energy saving mode will be described with reference to FIG. Here, first, the fax board 3 is in the normal mode, in which the main control unit 31 is activated, the sub control unit 32 is stopped, and the line relay 303 is switched to the main control unit 31 side.

  The main CPU 313 waits for an energy saving transition notification from the energy saving management unit 15 (No in step s51). When the energy saving transition is notified (Yes in step s51), the main CPU 313 changes the connection destination of the line relay 303 from the main control unit 31 side (modem / calling signal detection unit 312) to the sub control unit 32 side (incoming call detection unit 321). (Step s52), the sub control unit 32 is activated (step s53), and the main control unit 31 enters the sleep state (step s54). The activated sub CPU 323 waits until an incoming call signal is detected by the incoming call detection unit 321 (No in step s55).

  When an incoming call signal is detected by the incoming call detection unit 321 (Yes in step s55), the sub CPU 323 causes the incoming call detection information storage unit 322 to store the detection time T1 when the incoming call detection unit 321 detects the call signal ( In step s56), a return command signal is output to the energy saving management unit 15 (step s57). Thereby, the main control unit 31 returns via the energy saving management unit 15 and starts in the normal mode (step s58).

  The activated main CPU 313 acquires the current time via the clock unit 311 and sets it as the return time T2 (step s59). Subsequently, the main CPU 313 switches the connection destination of the line relay 303 from the sub control unit 32 side (incoming call detection unit 321) to the main control unit 31 side (modem / calling signal detection unit 312) (step s60). Further, the main CPU 313 acquires the detection time T1 from the sub CPU 323 (step s61), and acquires the required time T stored in the ROM 314 (step s62).

  Subsequently, the main CPU 313 sets T2-T1 to t, which is a timer for measuring time (step s63), and determines whether t ≧ T (step s64). That is, here, T2-T1, which is an elapsed time Y from when the sub-control unit 32 detects the arrival of the paging signal until the main control unit 31 returns, is set to the initial value of the timer t. Time measurement starts.

  Time measurement by the timer t is continued until t ≧ T (No in step s64), and when t ≧ T (Yes in step s64), the main CPU 313 goes off-hook (step s65) and ends this processing. . Thereafter, the modem / call signal detection unit 312 starts facsimile reception processing. Thereafter, the main CPU 313 may stop the sub control unit 32.

  Note that the time from the process of step s59 in which the return time T2 is acquired to the process of step s64 in which measurement by the timer t is performed is almost negligible.

  Also, the main CPU 313 starts the time measurement of the timer t from “0”, and even if the time obtained by adding T2−T1 that is the elapsed time Y to the measurement value of the timer t reaches the required time T, Good. That is, it is only necessary to be able to go off-hook when the time measured by the timer based on the elapsed time Y reaches the required time T stored in the ROM 314.

  With the above processing, in the present embodiment, the required time T required for the ringing number to reach the specified ringing number N from the arrival of the ringing signal is calculated in advance and stored in the ROM 314, and the sub control unit 32 is in the energy saving mode. When the incoming call signal is detected, the timer measures the time based on the elapsed time Y and goes off-hook when the measured time reaches the required time T. Further, when the incoming call signal is detected during the normal mode, the number of ringing of the ringing signal is counted, and when the count value reaches the predetermined number of ringing N, it goes off-hook. Therefore, according to the present embodiment, it is possible to go off-hook at a time corresponding to the correct number of ringing as the specified number of ringing preset by the user or the like without providing a ringing device.

  Further, in this embodiment, since the function of the sub control unit 32 is simplified, it can be configured with inexpensive parts, and the cost can be suppressed. Further, since the external telephone 4 is ringed by the calling signal, it is not necessary to provide a separate ringing device for ringing the external telephone 4, and the cost can be reduced.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

  For example, the main CPU 313 may acquire the elapsed time Y from the sub CPU 323. In this case, the sub CPU 323 stores the detection time T1 at which the incoming call signal is detected in the incoming call detection information storage unit 322, and when the main CPU 313 is notified of the elapsed time Y acquisition request, the elapsed time Y is acquired. The time obtained by subtracting the detection time T1 stored in the incoming call detection information storage unit 322 from the time when the request is notified may be notified to the main CPU 313 as the elapsed time Y. The sub CPU 323 measures the time from when the incoming call signal is detected until the main CPU 313 notifies the elapsed time Y acquisition request, and notifies the main CPU 313 of the measured time as the elapsed time Y. Also good.

1 Main controller 2 USB control 3 Fax board 4 External telephone (answering machine)
5 Public Line Network 10 Operation Panel Unit 11 Image Reading Unit 12 Storage Unit 13 Printing Unit 14 Communication Unit 15 Energy Saving Management Unit 16 Power Supply Control Unit 17 RAM
18 ROM
19 CPU
30 Connection switching unit 31 Main control unit 32 Sub control unit 51 Telephone line 301 Current detection unit (off-hook detection unit)
302 First relay 303 Line relay 304 Second relay 311 Clock unit 312 Modem / call signal detection unit 313 Main CPU
314 ROM
315 RAM
321 Incoming call detection unit 322 Incoming call detection information storage unit 323 Sub CPU
100 Image forming apparatus a1, a2, b1, b2, c1, c2 Connection point C1, C2 Capacitor T1, T2 Transformer

Claims (6)

A sub-control unit that detects an incoming call signal sent from the public network and returns the main control unit to the normal mode in the energy-saving mode;
Storage means for storing a time required for the number of ringing of the calling signal to reach a preset number of ringing after a call signal arrives;
After returning to the normal mode, the time is measured based on the elapsed time from the detection of the calling signal by the sub-control unit until the return to the normal mode, and the measured time is stored in the storage means A main control unit having main control means to go off-hook when time is reached;
A facsimile apparatus comprising: The main control means includes
When an incoming call signal sent from the public line network is detected during normal mode, the number of ringing of the ringing signal is counted, and when the count value reaches the preset number of ringing set in advance, it goes off-hook. The facsimile apparatus according to claim 1. The main control unit calculates the required time by ringing time of ringing cycle of ringing signal + ringing cycle x (specified number of ringing times -1), and stores it in the storage means. The facsimile apparatus described in 1. The sub-control unit is
An incoming call detection information storage means for storing a detection time when the incoming call signal is detected;
The main control means includes
The time obtained by subtracting the detection time stored in the incoming call detection information storage means from the return time acquired when returning to the normal mode is used as the elapsed time. The facsimile apparatus according to item 1. The sub-control unit is
An incoming call detection information storage means for storing a detection time when the incoming call signal is detected;
When the acquisition request for the elapsed time is notified from the main control unit, the time obtained by subtracting the detection time stored in the incoming call detection information storage means from the time when the acquisition request is notified is used as the elapsed time. The facsimile apparatus according to any one of claims 1 to 3, wherein the main control unit is notified. The sub-control unit is
Measure the time from when the incoming call signal is detected until the main control unit notifies the elapsed time acquisition request, and when the main control unit notifies the elapsed time acquisition request, The facsimile apparatus according to any one of claims 1 to 3, wherein the measured time is notified to the main control unit as the elapsed time.

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