JPS63109654A - Facsimile receiver - Google Patents

Abstract

PURPOSE:To prevent unevenness in density and to increase the total speed of recording, by deciding whether a thermal head is to be preheated or not from information from a temperature detecting and printing period detecting sections and controlling preheating by using the output of a preheating decision circuit. CONSTITUTION:This facsimile receiver is provided with a temperature detecting section 3 which detects the temperature of a thermal head, period detecting section 4 which detects line recording and printing period for line recording, drive control section 8 which controls the printing density of the thermal head, preheating decision circuit 5 which decides whether or not preheating is to be made from the information from the sections 3 and 4, and control section 6 which controls the drive control section to make preheating operations by using the output of the circuit 5. Therefore, a heating element is preheated when recording of data is caused to be performed next time and, consequently, necessary density can be obtained in a short time and recording operations of ordinary speed becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a thermal facsimile receiver that performs error retransmission, and in particular, to a thermal facsimile receiver that performs preheating according to warm conditions and drive conditions when driving a thermal head. Concerning the control of

Conventional technology Conventionally, this type of facsimile machine complies with the international standard
It belongs to the A or G2 category, and the data from the line is
In the case of G2, it was a certain percentage.In the case of G5, it occurred in bursts in page units and was not interrupted. Therefore,
Printing control of the thermal head was performed using page-by-page temperature information and print cycle information to keep the print density constant.

Problems to be Solved by the Invention In the conventional thermal recording facsimile receiver described above, a certain degree of continuity was guaranteed due to the nature of the data source, so control using temperature information was used to control print density. This was done page by page. However, for example, as in the international standard 04) (i) as an LC terminal,
When data error control is performed on a line, a data retransmission procedure is performed, so when viewed from the thermal head, the data at the data source may appear to have stopped. In such a case, the recording operation has been stopped for a long time, and when recording is restarted, the density of that line will decrease because the temperature of the heating element of the thermal head has decreased. Since energy is applied for a long time or for a long time, it takes a long time to print the 1 line, and there is a drawback that the recording speed after re-operation is reduced.

The present invention has been made in view of the above-mentioned actual circumstances of the prior art, and therefore, an object of the present invention is to provide a novel facsimile receiver capable of eliminating the above-mentioned drawbacks inherent in the conventional technology. .

Means for Solving the Problems In order to achieve the above object, the facsimile receiver according to the present invention includes a temperature detection unit that detects the temperature of the thermal head, and a cycle that detects line recording and the printing cycle that performs line recording. a detection unit, a drive control unit that controls the printing degree of the thermal head, a preheating determination circuit that determines whether or not to preheat the thermal head based on information from the density detection unit and the printing cycle detection unit; It is configured to include a control section that controls the anti-mosquito control section based on the output from the preheating determination circuit and performs a preheating operation.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to Fig. 1, reference number l is a thermal head which is a recording device, ko is a sensor that detects the temperature of the thermal head 1, 3 is a temperature detector that detects information from the sensor ko, and l is a print cycle detection. 3 is a preheating determination circuit that determines whether or not to perform preheating based on information from the temperature detector 3 and the printing cycle detector; 6 is a printing cycle detector for the temperature detector 31; and a control unit that performs preheating control on the thermal head based on the information from the preheating determination circuit 3 and performs normal recording control, or data for transferring the recording data passed from the control unit 1 to the thermal head lk. A transfer control circuit, t indicates a drive control section that controls printing of the thermal head 1 based on commands from the control section 6, and 9 indicates a CPU that controls the entire system. Also, /θO
is a system path that carries recording data and control information, 10
/ is printing start information notified from the control unit 6, 10- is print cycle information of the previous line outputted from the print cycle detection unit and input to the preheating judgment circuit and the control unit base, 103 is from the a degree sensor The output temperature information, 10 da, is the temperature information output from the temperature detector 3 and input to the preheating judgment circuit and the control unit base, lO! 106 is a preheating determination signal, 106 is data outputted from the control unit 6 and inputted to the data transfer control circuit 7, IO is the recording data outputted from the data transfer control circuit to the thermal head and its control line;
1 is print control information output from the control unit 6 to the drive control unit g, IO? is a print control signal passed to the thermal head l.

FIG. 1 is a structural diagram of the thermal head l shown in FIG. In FIG. 1, numeral 10 is a shift register into which data is input, and has a function of converting serial data into parallel data (hereinafter referred to as ≠ conversion). /10 is Sρ-converted data, and this data /10 is //
The signal is input to the latch section of the control signal io, and is latched by the control signal io. Elements 10 and /l exist for the number of data in the l line.

For example, if the resolution is usually 5 dots)/m and A4 size, /? This is the number of bit elements.

Furthermore, l in FIG. 1 is a heating element corresponding to each data, and l line is divided into n blocks of 5m bits. Signals 31, 32...Sn are print control signals for controlling printing of each block, and %109 in FIG.
is equivalent to

Figure 3 is a diagram showing the operation of the print control signals 81, 32..., Sn, and shows the printing time of the block. t1 must be made longer. Therefore, at low temperatures,
This means that it takes a lot of time to print the l line. This is the time for adjusting the printing density by t2, and the drive control unit S in the figure g/figure controls the time in response to a command from the control unit.

FIG. 4 is a diagram showing print control signals for preheating control performed by the drive control section t in FIG. 7 in response to instructions from the control section base. t3 is the print drive time notified by the control section 6, but in this control, the recording paper is not printed and the heating element shown in FIG. 2 is only preheated.

FIG. 3 is a diagram showing an example of operation when performing preheating control.

The horizontal axis t represents time. /3 is the section where print recording is performed. /da is a period where data from the data source is stopped and printing is not performed. /3 is the preheating operation section. t4 is a time when the preheating determination circuit S in FIG. 1 monitors the print cycle signal 102, stops the recording operation, and determines whether or not to perform preheating based on the temperature information 104I.

The control unit 6 receives data and a recording start command from the system bus 104, determines the print control time t1 in FIG. 3 based on the print cycle of io- and the temperature information of 10u, and transfers the data to the data transfer unit 7. , and informs the drive control section j of the printing control time t1, and each section 7. By operating r, printing operation and printing density are controlled.

Now, if a data error occurs on the line, and we are busy recovering the error and perform data retransmission control, from the perspective of the thermal head, data generation will stop.
As shown in FIG. S, the allocation operation stops. The preheating determination circuit j looks at the 10 printing cycles, and when time t4 has elapsed, determines whether preheating is necessary by checking the temperature information of IO't at that time. If the temperature information is below a certain temperature, the preheating control is performed by the control unit 6 using the signal 101.
tell to.

Yu11 @ unit 6 generates data according to this command, transfers the data to the data transfer control unit 7, informs the drive unit control unit of the preheating time t5, and instructs each unit? , tt-drive.

Therefore, since the heating element is preheated before the next data is to be recorded, the necessary density can be generated in a short time t1, and the recording operation can be performed without decreasing the speed.

As described in detail, according to the present invention, when the recording operation is stopped for a long time, the % temperature information is checked and preheating control is performed to eliminate density unevenness or the total recording speed. can be raised.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. ! ...Thermal head, K...Temperature sensor, J...
・Temperature detection section, DA... Print cycle detection section %j... Preheating judgment circuit, 6... Control section, ri... Data transfer control section, t... Drive fftlJ n section, v...・CPU
, 100...System bus, 10/...Print start signal, 10Co...Print cycle information, 103...Temperature information (Senna output) %10 River temperature change temperature information, i0!
f... Preheating determination signal, 101. ...data signal,
101...Data and control signal, /It...Print control signal, toq...Print drive signal Figure 1 shows the structure of the thermal head. 10...shift register, //...data latch circuit, lco...heating element, /10...recording data, St...Sn...print control signal Figure 3 shows the print control signal S1.32... is a diagram showing the operation of Sn. tl...Printing time, t2...Control time for temperature control Fig. 2 shows the operation of Sl, 52...Sn during preheating control. t5...Preheating drive time FIG. 5 is a diagram showing an example of the preheating operation.

Claims (1)

[Claims] A thermal facsimile receiver that performs error retransmission control includes a temperature detection section that detects the temperature of the thermal head, a cycle detection section that detects line recording and the printing cycle that performs line recording, and a drive that controls the print density of the thermal head. a control unit, a preheating determination circuit that determines whether or not to preheat the thermal head based on information from the temperature detection unit and the print cycle detection unit, and performs preheating control and normal recording based on the output from the preheating determination circuit. A facsimile receiver comprising a control section.