JPS59224973A - Printer controller for facsimile - Google Patents

Abstract

PURPOSE:To prevent the image resolution of a picture from being deteriorated by allowing the print operation to be avoided over a prescribed length at the start and end of a write line when a temperatue rise reaches a prescribed value. CONSTITUTION:A temperature signal (d) from a temperature sensor 3, a line synchronizing signal (e), a control signal (g) to a decoding section 2, control signals (h), (i) to a write section 6 and a printer section 7, and a clock signal (j) or the like are outputted from a control section 4 so as to control the entire facsimile. Further, based on each of the signals (b), (d), (e) and (j), both ends inhibiting section 5 decides write inhibition at both ends of a line, and the write section writes information in a shift register incorporated therein based on an inhibiting signal (c) of the inhibiting section 5. Then an output signal of the write section 6 is applied to a prescribed thermal head and printed by the printer section 7.

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides facsimile printer control that suppresses the temperature rise of the power supply or printer to prevent failures or malfunctions when black information continues without reducing the resolution of the printed image. Regarding equipment.

[Prior art]

As a conventional facsimile printer control device, for example, a temperature detector is installed in the printer to detect the temperature rise of the power supply etc. caused by printing a length of black, and a detection signal output from this detector is installed. On the basis of the,(
,) Stop writing (black printing) within a certain period of time after detecting a temperature rise, (b) Print every other line after detecting a temperature rise, (C) Set bits in the main scanning direction to 1 after detecting a temperature rise. There is a method that performs control such as thinning out and printing every other bit.

According to this control device, the printing operation is controlled to stop or slow down when the temperature of the printer or power supply unit reaches a temperature that increases, so the amount of heat generated by the thermal head is reduced, and , the load on the power supply becomes lighter and temperature rises are suppressed. As a result, it is possible to prevent power supply failures and machine malfunctions from occurring.

However, in conventional facsimile printer control devices, information is lost during write-protection in the controls (,) above, and in the controls (b) and (C) above, information is lost. There is a risk that the resolution of the printed image will decrease after the temperature rise is detected.

[Object and structure of the invention]

The present invention has been made in view of the above-mentioned problems, and in order to suppress the temperature rise of the power supply or printer and prevent malfunctions or malfunctions without causing loss of printed images or deterioration of resolution when black information continues, it is possible to reduce the temperature rise. To provide a printer control device for facsimile, which prevents printing over a predetermined length at the beginning and end of a writing line when the number reaches a predetermined value.

〔Example〕

Hereinafter, the facsimile printer control device according to the present invention will be explained in detail.

FIG. 1 shows an embodiment of the present invention, which includes a demodulating section 1 that demodulates a signal received from a line a, and a decoding section that decodes the demodulated signal by the demodulating section 1 and outputs a print signal. temperature sensor 3 that detects a temperature rise inside the power supply section or the printer, and a temperature signal d from the temperature sensor 3.
1 line synchronization signal e1 control signal g1 for decoding unit 2
A control section 4 that controls the entire facsimile machine by outputting control signals RI, t, clock signal j, etc. to the writing section 6 and printer section 7, which will be described later, and a print signal b1 line synchronization signal e1 temperature signal d and clock signal j, respectively. A both-end prohibition section 5 determines whether or not writing is prohibited at both ends of the line (start and end) based on a writing unit 6 that writes information to the built-in shift register based on the signal);
The output signal (the contents stored in the shift register) is applied to a predetermined thermal head (not shown) for printing.

The both-end prohibition unit 5 receives a temperature signal d, a line synchronization signal e generated for every l line in the main scanning direction, and a clock signal j as input signals, and outputs a signal that stops when the temperature rises. It is comprised of a counter section 51 which outputs a signal f which becomes low level after a predetermined number of occurrences of black and red, and a gate 52 which ANDs the signal f and the print signal C and outputs an inhibition signal C.

In the above configuration, the operation will be explained based on the time chart in FIG. 2. The print signal b (image information) is outputted from the decoding unit 2 in synchronization with the line synchronization signal
Normally, the temperature signal d is at a low level (temperature is below the set value), so the counter signal f is at a high level, the gate 52 is turned on, and the print signal is sent to the writing unit 6 without being inhibited. , normal printing operations are performed. On the other hand, when black is printed continuously and the temperature of the power supply unit or printer unit rises and exceeds the set value and the temperature signal d appears at no repeat, the next line is determined based on the count value of the clock signal j of the counter 51. The counter signal f is converted from a high level to a low level signal for a predetermined period of time before and after the synchronization signal e.

In this case, the count setting value (corresponding to the low level time of the counter signal f) is set in advance so as to hit the two ends of the document, for example. This length was selected based on the fact that both ends of the manuscript are infrequently filled in and have little impact on visual recognition, and the length can be chosen by the individual depending on the manuscript size. can. When the counter signal f becomes a low level, the AND condition for the print signal is not satisfied, and the output signal C from the both-end prohibition section 5 is interrupted for a time 21 (1 corresponds to 2 m). Therefore, writing to the writing section 6 does not appear on the line for a period of time 2t, and white is printed. After the time 2t ends, the counter signal f becomes a no-level again, and printing is continued in accordance with the print signal.When the count during this period reaches a position 2QII before the end of the l line, the counter signal f is set to a low level again. Print white on top.

In the above explanation, the both-end prohibition portion 5 is
In addition to the temperature, for example, it counts the number of black lines from the beginning of the page, and outputs a signal when this count exceeds a certain number (selected according to the temperature rise). This may be used instead of the temperature signal d.

〔Effect of the invention〕

As explained above, according to the facsimile printer control device of the present invention, when black information is continuously printed over a predetermined length at the beginning and end of the writing line when the temperature rise in the power supply section or the printer section reaches a predetermined temperature, This makes it easy to operate, so you can suppress temperature rises without missing printed images or lowering resolution, and prevent malfunctions or malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a time chart of the embodiment of FIG. Explanation of symbols 1... Demodulation section, 2... Decoding section, 3... Temperature sensor, 4... Control section, 5... Both ends prohibition section, 6... Writing section, 7.・・Printer section,
51...Counter section, 52...Gate. Patent applicant Fuji Xerox Co., Ltd. Agent Patent attorney Shin Matsubara 2

Claims (1)

[Scope of Claims] A facsimile apparatus that demodulates a received signal and prints it based on a line signal obtained by encoding the received signal, comprising: means for outputting a temperature signal corresponding to the temperature of the power supply section of the facsimile machine or the printer; The present invention is characterized by providing means for prohibiting printing operations for a predetermined length at the beginning or end of a writing line when it is determined that the temperature of the power supply unit or the printer has reached a predetermined temperature based on a temperature signal. facsimile printer control device.