JPH02215554A - Recorder of thermal recording system - Google Patents

Abstract

PURPOSE:To prevent heat generating resistors from generating heat on the occurrence of an abnormal condition in a controlling system when recording is stopped by generating white data upon detection of the end of a printing operation, and latching the white data. CONSTITUTION:When recording of image data is finished, a controlling part 12 performs such a control as the bring an enable signal ENL to a high level, thereby closing AND gates A0 to A63 and bringing output terminals OUT-0 to OUT-63 to a high level. In this condition, no current is passed to heat generating resistors, so that a thermal head is maintained in a stopped condition. Next, the controlling part 12 starts a white data generating part 15 to generate white data for at least one line, the white data is once stored in a storing part 13, and is read to be sent to a recording part 11. Then, the controlling part 12 performs such a control as to cause the white data to be held in latches L0 to L63, thereby completing a recording process.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention is applicable to heat-sensitive devices installed in facsimile machines, etc. This invention relates to a recording type recording device.

(Prior Art) Conventionally, recording devices installed in facsimile machines are mainly thermal recording type, and FIG. 6 is a block diagram showing an example of a conventional facsimile machine of this type. After the line is established with the other party via the telephone line 1, when image data is received by the communication circuit 2, this image data is subjected to image processing by the image processing unit 4 and then stored in the storage unit 6. be done. The image data stored in the storage section 6 is stored in the control section 9.
The data are sequentially read out according to the recording speed of the recording section (thermal printing method) 8 and sent to the recording section 8.

At the same time, the control unit 9 controls the printing of the recording unit 8,
Printing power is supplied from the power supply section 7 to the recording section 8 . Thereby, the recording section 8 thermally prints the image data inputted from the storage section 6 on recording paper (not shown) and outputs the image data. Further, during a copy operation, the image data read by the reading section 3 is subjected to image processing by the image processing section 4, and then temporarily stored in the storage section 6. The data stored in the storage section 6 is read out and input to the recording section 8, thereby performing the same recording operation as described above.

FIG. 2 is a circuit block diagram of a general thermal head provided in the recording section 8. As shown in FIG. A plurality of heat generating resistors 31 are arranged, one end of each heat generating resistor 31 is connected to V24 which is a +24V printing power supply, and the other end is connected to an IC 32 that controls the heat generating resistors 31. . Furthermore, S
I indicates an input terminal for image data, ENL1-4 indicate an enable signal, GK indicates a clock signal, 5 indicates a power supply for operating the IC 32, and GND5 and GND24 indicate the ground potential of each of the above-mentioned power supplies.

FIG. 3 is a circuit diagram showing an example of the circuit of the IC 32 shown in FIG. 2. Image data input from the input terminal SI is input to the D terminal of the flip-flop Fo via the buffer 42. At the same time, the clock GK is input to the inverter 41.
When input to the flip-flops Fo to F63 via the image data, the image data is sequentially shifted and held in each flip-flop.

After that, the latch data LATCH is transferred to the latch L via the inverter 43. -163, the data held in the flip-flop FO"F1a is latched L.-L
63. In this condition, the input terminal ENL
When a low active enable pulse is input to
The AND gate AO''A63 is opened. As a result, the data latched in the latch LO'''L63 via the AND gates AQ to A63 is transferred to the inverting amplifier I. ~Input to I63. Inverting amplifier I. -163 is AND gate Ao-A
The "1" or "0" data outputted from 63 is inverted and amplified and outputted to output terminals 0UT-0-OUT-63 to which the heating resistor 31 shown in FIG. 2 is connected. A current flows through each heating resistor 31 in accordance with the black data latched by the latch L.-163.

The heating resistor through which the current flows generates heat, turning the heat-sensitive recording paper pressed against the resistor black, and recording is performed. However, in the figure, it is assumed that the terminal ENH is always at a high level.

Here, when the recording section 8 configured as described above is not performing a recording operation, the control section 9 sends the enable signals qEN1-1 to
Since the EN14.2 high level is set, for example, image data may be latched. -163 and even if power of V2/l is supplied to the heat generating resistors 31, no current flows through each heat generating resistor 31. However, the control unit 9 goes out of control for some reason, and the enable signal E
If NL1 to ENL4 are set to low level and the previous image data remains in the latches Lo to L63, current will flow through the heating resistor corresponding to the black data and generate heat. In such a case, since the control unit 9 is abnormal, there is no limit to the heat generation time if the above situation occurs. Therefore, the recording paper may burn due to overheating, and in the worst case, the apparatus may be burnt out, leading to a fire.

(Problems to be Solved by the Invention) As described above, in the conventional thermal recording type recording device installed in a facsimile machine, etc., if the control system of this recording device goes out of control and performs abnormal operation when recording is stopped, In some cases, current may flow through the heating resistor for an unlimited period of time, causing the recording paper to burn due to overheating, or in the worst case, causing a fire. SUMMARY OF THE INVENTION Accordingly, the present invention aims to eliminate the above-mentioned drawbacks, and provides a thermal recording type recording device that prevents heat generation of the heating resistor even if an abnormality occurs in the control system when recording is stopped, thereby improving reliability. It is an object.

[Structure of the Invention] (Means for Solving the Problems) The present invention latches printed data with a latch means, outputs the latched data to the heating resistor side via the gate means, and then outputs the latched data to the heating resistor side. In a thermal recording type recording device that performs thermal printing on thermal recording paper that is in close contact with the heat generating resistor, white data is generated by controlling whether or not to flow current according to the data. The apparatus comprises a white data generating means and a control means for controlling the white data generating means to generate white data and causing the latch means to latch the white data when detecting the end of the printing operation. There is.

(Function) In the thermal recording type recording apparatus of the present invention, when the control means detects the end of the printing operation, it controls the white data generation means to generate white data and the white data to be latched by the latch means. As a result, even if the white data is output to the heating resistor due to some abnormality after the recording device has finished operating, current is prevented from flowing through the heating resistor, eliminating uncontrolled heat generation of the heating resistor. be able to.

(Example) An example of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of a thermal recording type recording apparatus of the present invention. 11 is a recording unit that prints and outputs image data on thermal recording paper; 12 is a control unit that controls the input of image data and the printing of the recording unit 11; and 13 is an input terminal 1.
a storage unit 14 that temporarily holds the image data input from 6;
Reference numeral 15 designates a power supply unit that supplies power for printing to the recording unit 11, 15 a white data generation unit that generates O'' white data, and 16 an input terminal for image data.

Next, the operation of this embodiment will be explained. When received facsimile image data or scanned image data of a copy original is input from the input terminal 16, the control unit 12 controls the storage unit 13.
After the input image data is once stored, the image data is read out from the storage section 13 and provided to the recording section 11 in accordance with the printing speed of the recording section 11.

At the same time, the control section 12 starts up the power supply section 14 to supply power for printing to the recording section 11 . The recording unit 11 prints the input image data on thermal printing recording paper and outputs it.

The structure of the thermal head of the recording section 11 of this example is as shown in FIG. 2, and is as described in the conventional example. Also,
The internal circuit of IC 32 in FIG. 2 has the configuration shown in FIG. 3. That is, the image data as shown in FIG. 4(A) inputted from the input terminal SI is sequentially transferred to the flip-flop F as shown in FIG. 4(B) by the lock CK.
o to F63, and then the flip-flop F is inputted to the latch signal LATCH as shown in FIG.

~F63 data is held in latch Lo~163.

Next, as shown in FIGS. 4(D) to 4(G), when enable signals EN1 to EN4 are input from the terminals ENL, the AND gate A is activated. - Latch via A63. The contents of ~163 (inverted data) are output to the output terminals 0LJT-0 ~ OU-63, and the heating resistor 3 corresponding to the low level output terminal
1 (shown in FIG. 2), a current flows and thermal recording is performed. Note that the clock CK, latch signal LATCH, enable signals ENL1 to ENL4, etc. are outputted by the control section 12, and the terminal ENH is normally at a high level. In this way, when recording of the image data is completed, the control section 12 sets the enable signals ENLI to ENLI4 to a high level and activates the AND gate A. -A63 is closed, output terminal 0UT-0~0
It is controlled so that UT-63 is at a high level. Naturally, therefore, in this state, no current flows through the heating resistor 31, and the thermal head stops operating. Next, the control section 12
starts the white data generation section 15 to generate at least one line of white data, temporarily stores this in the storage section 13, reads it out, and sends it to the recording section 11. Next, the control unit 12 performs control to hold the white data in the latch LO""L63, and ends the recording process.

FIG. 5 is a flowchart showing the printing control operation of the control section 12. First, in step 501, input image data is stored in the storage section 13.

At step 502, data is read line by line from the recording section 11 and sent to the recording section 11. In step 503, it is determined whether or not the print data is the final line. If it is not the final line, the process returns to step 501. If it is the last line, the process advances to step 504, where the white data generating section 15 generates white data, and this is stored in the storage section 13.

In step 505, one line of white data is read from the storage section 13 and sent to the recording section 11. In step 506, the white data is held in the latch and the process ends.

According to this embodiment, the control section 12 sends the last line of image data to the thermal head of the recording section 11, then causes the white data generation section 15 to generate white data, and latches this white data. -'63, and then the operation of the recording section 11 is stopped. Therefore, after that, the control unit 12 causes an abnormality, and even if the enable signals ENL1 to ENL4 are set to low level, the AND gate A is activated.

~ Even if A63 is opened, the data output to the heating resistor 31 side is a high level signal corresponding to the latched white data, so it is possible to prevent current from flowing to the heating resistor 31. Therefore, it is possible to prevent the recording paper from being burned out, and thus to prevent a fire from occurring, and it is possible to improve the reliability of the apparatus.

In the embodiment of the present invention, the white data generated by the white data generating section 15 is stored in the temporary storage section 13 and then sent to the recording section 11. However, the white data is input to the latch of the recording section 11. It is obvious that other methods may be used to do this.

[Effects of the Invention] As described above, according to the thermal recording type recording device of the present invention, even if an abnormality occurs in the control system when recording is stopped, the heating resistor can be prevented from generating heat, thereby improving safety. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a thermal recording type recording device of the present invention, FIG. 2 is a block diagram showing an example of the circuit configuration of a thermal head of a thermal recording type recording device, and FIG. A circuit diagram showing a detailed circuit example of the IC circuit shown in FIG.
Fig. 4 is an operation time chart of the IC circuit shown in Fig. 3, Fig. 5 is an operation flowchart of the control section shown in Fig. 1, and Fig. 6 is a facsimile machine equipped with a conventional thermal recording type recording device. It is a block diagram showing an example. 11...Recording section 13...Storage section 15...White data generation section 32...IC AO""A63...AND gate FO""63...Flip-flop Lo to L63...Latch 12... Control unit 14... Power supply unit 31... Heating resistor agent Patent attorney Book 1) Takashi Z Figure 1 Figure 6

Claims (1)

[Claims] The print data is latched by the latch means, and the latched data is output to the heating resistor side via the gate means.
In a recording device of a thermal recording type that performs thermal printing on thermal recording paper that is brought into close contact with the heating resistor by controlling whether or not current flows through the heating resistor according to the data, The present invention further comprises a white data generating means for generating data, and a control means for controlling the white data generating means to generate white data and causing the latch means to latch the white data when the end of printing operation is detected. A recording device using a heat-sensitive recording method.