JPS5832547B2 - Simultaneous facsimile transmission and reception method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating plane scanning type facsimile machine, and more particularly to a simultaneous transmission and reception system using this type of facsimile machine that is capable of both transmitting and receiving functions.

Most conventional facsimile machines cannot perform transmitting and receiving operations at the same time (simultaneous transmission and reception in bidirectional communication).

In other words, it was impossible to receive while transmitting, and it was impossible to transmit while receiving.

Therefore, when performing simultaneous transmission and reception, it is necessary to prepare two pairs of facsimile transmission and reception devices, which is not desirable in terms of cost and space.

The present invention solves the above-mentioned problems of the conventional technology, and its purpose is to enable simultaneous transmission and reception by simply installing one facsimile machine on each of the sending and receiving sides, and the facsimile machine is inexpensive. It is an object of the present invention to provide a simultaneous facsimile transmission and reception system that allows facsimile data to be intercepted and is easy to handle.

A feature of the present invention that achieves this object is that a head section including a read head and a recording head performs main scanning by reciprocating in a straight line, and a predetermined number of pulse signals are applied to the drive source of the head section. This is a simultaneous transmission/reception method using a facsimile device that can be used for both transmission and reception, and the same facsimile IJ device described above is installed at each station, and the station that performed the transmission operation first is designated as the main station. By transmitting a synchronizing signal from the main station to other stations at least until the end of communication, the stations are synchronized in phase and can simultaneously transmit and receive facsimile signals.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a diagram schematically showing a main scanning section drive mechanism in an embodiment of a facsimile apparatus used in the present invention.

Reference numeral 1 denotes a carrier to which a reading head and a recording head are fixed, and this carrier 1 is attached to a belt 3.

The belt 3 is held under tension by pulleys 4 to 7, and the pulley 4 is fixed to the shaft of the main scanning pulse motor 2.

As the pulse motor 2 alternately repeats normal rotation and reverse rotation, the carrier 1 is moved from a to b to position C, and further reciprocated from C to b to position a.

The distance W from a to C corresponds to the original height or the width of the recording paper.

In this way, the reciprocating movement of the carrier 1 causes the reading head or the recording head to main scan the document surface or the recording paper surface in a reciprocating manner.

FIG. 2 is a diagram specifically explaining the mechanical configuration of this embodiment.

One end of the optical fiber 8 is supported by a bearing 9 fixed to the carrier 1 and serves as a reading head, facing the original 12. The other end is supported by a bearing 10 and facing the light source 11 and the photodetecting element 13. It is set up to do so.

The recording head 24 faces the recording paper 31.

The pulse motor 2 is for main scanning and drives the carrier 1 via a belt 3.

The pulse motor 32 is for sub-scanning (feeding originals and recording paper), and a pulley 33 is fixed to its shaft.
is connected to the document feed roller 29a, the ratchet gear 28, and the recording paper feed roller 30.

In this way, in this example, the main scanning and sub-scanning are performed by the driving sources that are used together for transmission and reception.

Electromagnets 25 and 26 are for preventing recording operations.

That is, when the electromagnet 26 is driven, the latch lever 27
is attracted, the ratchet gear 28 is locked, and the power of the pulse motor 32 is not transmitted to the roller 30.

When the electromagnet 25 is driven, the recording head 24 is attracted and the recording needle is separated from the recording paper.

Therefore, when reception is not performed, the electromagnets 25 and 26 are driven to prevent recording and feeding of the sub-scanning recording paper, and when reception is performed, recording is possible because these electromagnets are not driven.

Further, the electromagnet 18 is for enabling a read operation.

That is, when the original 12 is inserted, the light from the light source 14 reaching the sensor 20 is blocked, the electromagnet 18 is driven by the control circuit 21, the lever 19 is attracted, and the original feeding mechanism 16 overcomes the compression spring 17. Being pushed up.

As a result, the original feeding roller 29a. The original 12 is pinched between the auxiliary rollers 29b and the auxiliary rollers provided opposite to these rollers, and the reading and feeding (sub-scanning) operations of the original can be performed on six pages.

Therefore, when transmitting, the electromagnet 18 is driven to enable reading and sub-scanning, and when not transmitting, reading and sub-scanning are blocked because the electromagnet is not driven.

Note that the driving of these electromagnets 25, 26, and 18 are all appropriately controlled by a control circuit 21.

In addition, 34 is a switching key between communication state and local state;
5 is a pseudo resistor for that purpose.

FIG. 3 is a block diagram mainly showing the control circuit portion of this embodiment, and the transmitting/receiving operation of the facsimile machine used in this system will be explained below using this diagram.

The operation is explained in the order of 5116 (1) transmission operation, (2)
Reception operation, (3) Reception operation during transmission, (4) Transmission operation during reception, (5) Local operation (test operation)
We will explain each in this order.

(1) Transmission operation In this case, this device becomes the master station and receives the synchronization signal from the receiving side (slave station).
It will be sent to

The transmission operation is started by inserting the original 12.

When the original 12 is inserted, the light from the light source 14 is blocked.
Sensor 20 operates and flip-flop 66 is inverted;
The inverted output of this flip-flop 66 is the OR gate 64.
When the pulse signal of the oscillator 36 is applied to the AND gate 3, the AND gate 1 and 37 are opened.
8 and the AND gate 39.

On the other hand, the "0" signal from the sensor 20 is turned into a "1" signal by the inverter 65, and is applied to the electromagnet 18 via the amplifier 69, so that the document feeding mechanism 16 described above operates.

Now, the pulse signal applied to the AND gates 38 and 39 causes the AND gate 39 to be open at first due to the action of the flip-flop 40σ, so that the pulse signal is applied to the first counter 4.
1, and the counter 41 operates.

By controlling this counter 41, the clock pulse generator 4
From each terminal of 2 (0), (1), (2),...
..., (n) clock pulses are sequentially output, and these clock pulses are applied to the main scanning motor 2 via the OR gate 43, the frequency divider 45, the counter gates 1-48, and the drive circuit 49, The pulse motor 2 is started and accelerated.

When the clock pulse from the clock generator 42 reaches (n), a preset signal is applied to the first counter 41, and from then on, the clock pulse (n) is continuously output from the clock generator 42 and the pulse motor 2 becomes a constant speed state.

At the same time, the second counter 44 starts operating and counts the number of clock pulses (n).

This counter 44 is a circuit that counts the number of steps of the pulse motor 2, that is, the number of clock pulses, corresponding to the moving distance of the read head and the recording head for one scan.

When the clock pulse (n) reaches a predetermined number, the counter 4
4 inverts the flip-flop 40, and the pulse signal from the oscillator 36 is input to the "DOWN" terminal of the counter 41 via the AND gate 38.

As a result, the clock generator 42 D-[n), (n-1
), (n-2), ......, (2>, (1)
The clock pulses are sequentially output, and the pulse motor 2 is controlled to decelerate by these clock pulses.

Next, when a clock pulse (0) is output from the clock generator 42, the flip-flop 40 is inverted, the AND gate 39 is opened, and the counter 41 starts counting up.

At the same time, the flip-flop 46 is also reversed to close the AND gate 48 and open the AND gate 4γ, so that the main scanning pulse motor 2 rotates in the opposite direction.

At the end of the transmission operation, the sensor 2 detects that the original 12 is no longer present.
This is done by detecting at 0 and inverting flip-flop 66.

A synchronization signal is sent from flip-flop 52 through AND gate 53, OR gate 54, and output terminal 15 when the clock pulse from clock pulse generator 42 changes from (0) to (1).

However, when the output terminal Q of the flip-flop 46 is in the "l" state (carrier 1 is in the position a in FIG. 1) and the output of the flip-flop 68 is in the "1" state, the AND gate 53 is in the "1" state. Since it is open, a synchronization signal is sent only at this time.

That is, this synchronization signal is controlled by the flip-flop 46 to be sent every round trip of the carrier 1, and the flip-flop 68 performs a receiving operation during the transmitting operation or when the transmitting operation is completed. It is controlled so that it is transmitted if this reception operation continues after that.

Then, the time during which the carrier 1 is stopped at position a (see FIG. 1), that is, the interval between clock pulses (0) and (1) of the clock pulse generator 42, is a predetermined time (for example, (15 seconds)). If this is the case, the delay circuit 63 operates and the Noritsu flop 68 is inverted, so that the AND gate 53 is closed and the transmission of this synchronizing signal is stopped.

Since the AND gate 56 is open when the clock pulse from the clock pulse generator 42 is (11) (during the constant speed section of the pulse motor 2), the image signal is transmitted through the optical fiber 8, the photodetecting element 13, and the amplifier. 55, the AND gate 56, the OR gate 54, and the output terminal 15, and are sent out only during the above period.

Also, when clock pulse canu O) is (carrier 1
is at both the left and right ends and stops momentarily, that is, 1
Each time the main scanning is completed, the sub-scanning pulse motor 32 is driven via the branching unit 50 and the drive circuit 51 to feed the original 12.

In this case, since the AND gate 67 is open, the electromagnets 25 and 26 are driven via the amplifier 70, and the recording operation is blocked.

(2) Reception operation In this case, this device becomes a slave station and receives a synchronization signal from the master station (transmission side).

When the facsimile apparatus in this example is turned on, it enters a reception standby state, and this state is maintained when no transmission operation is performed.

A synchronizing signal is received from the input terminal 22, detected by the signal selector 60, and controlled to control the flip-flop 62.
A reception operation is started by applying a signal via the OR gate 64 and opening the AND gate 37.

Thereafter, the pulse motors 2 and 32 are driven in exactly the same manner as in the transmission operation (1) described above.

The receiving operation is terminated by operating the signal selector 60, 61 and the synchronizing signal detector 71 when the synchronizing signal is not received via the input terminal 22 for a predetermined period of time or more (for example, 0.5 seconds or more), In this case, flip-flop 62 is inverted and all operations are stopped.

The synchronization signal received every time the carrier 1 makes a round trip is output from the output terminal Q of the flip-flop 46, and the gate 59 is opened, so the synchronization signal detector 7
1 is detected and the counter 41 is reset.

Therefore, phase synchronization with the transmitting side, that is, start-stop phase synchronization for each reciprocating scan is performed.

The image signal received following the synchronization is determined by the AND gate 57 when the clock pulse of the clock pulse generator 42 is (
n), it becomes open, and therefore, only during this period, the voltage is applied to the recording head 24 via the input terminal 22, the AND gate 57, and the amplifier 58, and information is recorded.

Note that as described above (the synchronization signal is detected by the signal selector 61,
When the flip-flop 62 is inverted, a signal of "0" is generated at the output terminal IQ of this flip-flop, so that the ant game 1 and 67 are closed and the electromagnets 25 and 26 are not driven.

Therefore, as described above, the recording becomes possible.

(3) Receiving operation during transmission In this case, this device becomes the master station and sends synchronization signals to the slave stations until all operations are completed.

When a received signal is received while in the transmitting state as described in (1), it is detected by the signal selector 60 and the flip-flop 62 is inverted.

Therefore, signals of "1" and "o" are generated at the output terminals Q and Q of the flip-flop 62, respectively, and the AND gate 67
Since the is closed, the electromagnets 25 and 26 for preventing recording become non-driven as described above, and the recording force of the recording head 24 is exerted on the recording paper 31 (FIG. 2), and the recording paper 31 is fed out. is also possible.

Further, since the "1" signal is applied to the OR gate 64, the ant game 1-37 is opened.

Therefore, the receiving operations are performed simultaneously.

When only the transmission is completed in this state, the sensor 20 operates, the document feeding electromagnet 18 becomes non-driven, and the document feeding mechanism 16 (FIG. 2) is pressed down by the compression spring 11 (FIG. 2).

At the same time, the Noritsubu flop 66 is inverted and its output is “0”.
However, the output terminal Q of the receiving flip-flop 62
1" signal passes through the OR gate 64 to the AND gate 3.
7, this anchor 37 maintains an open state and reciprocating main scanning and sub-scanning for recording continues.

In this case, since the flip-flop 68 is not inverted, the synchronizing signal is sent from the output terminal 15 to the slave station via the AND gate 53 and the OR gate 54.

When performing a reception operation during transmission in this way, since no synchronization signal is sent from the slave station, the master station maintains the phase synchronization of reception using the transmission [11b synchronization signal].

(4) Transmission operation during reception In this case, the device becomes a slave station and does not send out a synchronizing signal until all operations are completed.

As described in (2), when the transmission start operation, that is, the insertion of the original 12 is performed while in the receiving state, the sensor 20 detects this, and the electromagnet 18 is driven via the inverter 65 and the amplifier 69, and the original feeding mechanism 16 is detected. (FIG. 2) operates and transmitting operations are performed at the same time.

Also, the flip-flop 66 is inverted and the AND gate 3
Since a signal of "1" is applied to 7, even if only reception ends in this state, reciprocating main scanning and sub-scanning for reading continue, and the transmitting operation is maintained.

Note that during reception, the output terminal Q of the Noritsubu flop 62 outputs an "O" signal, so the ant game 1-6
7 is closed even when the original 12 is inserted and the transmission operation is performed, so the output signal of the flip-flop 68 is "0".
//, the AND gate 53 is closed and no synchronization signal is sent out.

(5) Local operation In this case, reading and recording of the read information are performed only within this device, and it is possible to perform the first test operation as well as the Hirakata operation.

Communication (CO
) to local (LO), the input terminal 22 and the output terminal 15 are short-circuited via the pseudo-resistor 35, and the output signal to be sent becomes an input signal and is recorded on the recording paper.

Note that in this case, the electromagnet 69 is driven, and the electromagnet 25.2
6 is not driven and is in a state where both reading and recording are possible.

FIG. 4 is an explanatory diagram of the above-described operation of this embodiment.

The carrier 1 is in a stopped state, for example, at the left end, then starts, accelerates, reaches a constant speed, and as it approaches the right end, it changes from deceleration to stop, and then accelerates toward the left and reaches a constant speed. When the vehicle reaches the left end, it decelerates and comes to a stop.

These operations are one cycle (two main scans) in a round trip, and a synchronization signal is exchanged for each cycle of operation.

Acceleration and deceleration of the carrier are controlled by a counter 41 and a clock pulse generator 42 shown in FIG.
The constant speed section is determined by counting the number of clock pulses by the counter 44 (CO2), and this number is defined by the carrier distance corresponding to one step of the pulse motor 2 and the applied number.

In this example, one main scan is defined by counting clock pulses for both transmission and reception, and the synchronization signal detector 71 shown in FIG. The counter 41 is controlled by , and the phase between transmission and reception is adjusted.

As explained above, in the method of the present invention, the station that first performs the transmission operation is the master station, and the synchronization signal is sent only from this master station, which simplifies the circuit configuration and reduces the cost of the device. Simultaneous facsimile transmission and reception can be performed simply by installing a fax machine at each station.

It is also very easy to operate. Furthermore, since the transmission path can be used effectively, it is effective when the general telephone network is used as the transmission path, and it is especially effective when used for expensive international communication lines.

As described above, the practical effects of the simultaneous facsimile transmission and reception system of the present invention are very impressive.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the main scanning drive mechanism of an embodiment of a facsimile machine used in the present invention, FIG. 2 is an explanatory diagram of the mechanical configuration of this embodiment, and FIG. 3 is a diagram of the control circuit of the above embodiment. The block diagram and FIG. 4 each show an explanatory diagram of the operation of the above embodiment. 1: Carrier, 2: Main scanning pulse motor, 3: Belt, 4 to 7: Pulley, 8: Optical fiber, 9° 10: Bearing, 11, 14: Light source, 12: Original, 13: Photodetection element, 15 : Output terminal, 16: Original feeding mechanism, 17:
Compression spring, 18, 25° 26: Electromagnet, 19, 27: Lever, 20: Sensor, 21: Control circuit, 22: Input terminal, 24: Recording head, 28: Ratchet gear, 29a
. 29b, 30: Roller, 31: Recording paper, 32: Sub-scanning pulse motor, 33: Pulley, 34° 34a, 34
b: Switching key, 35: Pseudo-resistor, 36: Oscillator, 3
7,38,39,47,48゜53.56,57,59
, 67: AND gate, 43.54, 64 NOR gate, 40, 46° 52.62, 66.68: Flip-flop, 41.44: Counter, 42: Clock pulse generator, 45, 50: Frequency divider, 49 , 51: drive circuit, 5
5.58, 69.70: Amplifier, 60°61: Signal selector, 63: Delay circuit, 65: Inverter, 71: Synchronous signal detector.

Claims (1)

[Claims] 1. By performing main scanning by linearly reciprocating a head section including a reading head and a recording head, and applying a predetermined number of pulse signals to the drive source of the head section, 1. Each station is equipped with a facsimile machine for both transmitting and receiving functions, which is equipped with a preemption function that allows the main scanning to end, and is capable of being in the receiving and transmitting states at the same time. By transmitting a synchronization signal from the main station to the other station until the transmission of the main station and the other station is completed, the phases of the stations are synchronized and facsimile signals are simultaneously transmitted and received. A simultaneous facsimile transmission and reception system featuring: 2. The simultaneous facsimile transmission and reception system according to claim 1, wherein the transmission operation state of the facsimile device is activated by the insertion of a transmission document into the device.