JPH01258963A - Linear recording head control system - Google Patents

Abstract

PURPOSE:To reduce the capacity of a power supply section and thereby make the drive section of a linear recording head compact by providing a capacitor of large capacity to compensate for a line current. CONSTITUTION:A power supply section 5 which supplies electricity required for printing recorded data using a recording head 3 and a capacitor 8 for accumulation of electricity which has not been consumed for printing the recorded data by the recording head 3 after consumption of the amount of electricity supplied from the electric supply section are provided. Next, if the amount of electricity required for printing a single line of recorded data exceeds that supplied from the power supply section 5, the amount of electricity accumulated in the capacitor 8 is consumed. Consequently, if the printing rate of the single line is '1', adequate printing density can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control system for a line type recording head.

[Prior Art] FIG. 4 shows an electronic control block diagram of the conventionally most commonly known line-type thermal head.

In this example, after recording data for one line is sent from the CPU to the thermal head 3, the CPU 1 sends a strobe clock signal to the decoding circuit 2, and the decoding circuit 2 sends the strobe to the thermal head 3. A signal is sent, and the recorded data is printed on recording paper.

Of course, each time printing for one line is completed, the platen drive motor 4 feeds the recording paper by the amount of printing space for one line, thereby repeating predetermined printing on the recording paper. In this case, the operating sequence in this electronic control system is shown in FIG. The print speed is increased by sending the print data from the printer to the thermal head 3. In addition, all one line is printed, that is, the printing rate (=number of printed dots/number of tods per line) is 100.
It was equipped with a power supply unit with a power supply capacity that could provide sufficient print density even in the case of 100% printing density.

[Problems to be Solved by the Invention] However, the large-capacity power supply section 5 that can obtain sufficient print density even when printing all one line has the drawback of being extremely expensive.

SUMMARY OF THE INVENTION An object of the present invention is to enable the use of a power supply section with a small power supply capacity, thereby achieving downsizing and cost reduction of the device as well as saving energy consumption.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a control method for a line type recording head in which recording data is printed one line at a time on recording paper from the recording head in synchronization with a strobe signal. a power supply unit that supplies electricity necessary for printing data recorded by the recording head; and a capacitor that stores electricity that is not consumed for printing data recorded by the recording head out of the amount of electricity supplied from the power supply unit. and controls so that the electricity stored in the capacitor is consumed when the amount of electricity required to print one line of record data to be printed next exceeds the amount of electricity supplied from the diary power supply unit. It is something. At that time, when the amount of electricity required to print the next line of recorded data mentioned above exceeds the sum of the amount of electricity supplied from the power supply and the amount of electricity stored in the capacitor,
By controlling the output timing of the strobe signal to be delayed until the excess amount of electricity is accumulated in the capacitor from the power supply section, the output voltage of the power supply section will be lower. Enough.

[Function] According to the invention having the above configuration, sufficient print density can be obtained even when the print rate for one line is "1" by supplementing the power supply current with the high capacity capacitor. In addition, if the printing rate of one line of recorded data to be printed next exceeds the power supply capacity of the power supply unit and the amount of electricity stored in the high capacity capacitor, the control unit controls the capacitor according to the degree of exceedance. Control is performed such that the battery is charged and printing of the next line is delayed.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 1 shows an electronic control block diagram of a line type thermal head according to the present invention. In this figure, the same components as the above-mentioned conventional configuration are given the same reference numerals, and detailed explanation thereof is omitted. . In this illustrated embodiment, the current capacity l
A power supply unit that has a current capacity that can compensate for the current consumption at a printing rate of about 30% for one line, and has a current limiting circuit (not shown) that allows the current consumption to flow only at a printing rate of about 30%. 5 is provided, and an AND circuit 6 and a counter 7 are provided as a means for counting the number of printed dots of one line of recorded data sent from the CPU section 1 to the line type thermal head 3, and a power supply current supplement for the line type thermal head 3 is provided. A high-capacity capacitor 8 is separately provided for this purpose.

The counter 7 is reset by a reset signal sent from the CPU section 1.

The AND circuit 6 inputs the data shift clock to the line type thermal head and the recording data, and inputs the data shift clock to the counter 7 only when the recording data is "1".
output to the tarok input.

The counter 7 counts the clock and sends the count value to the CPU section 1. Control unit (program software,
(not shown), the sent count value is sent to the power supply unit 5.
When the reference value T determined by the power supply capacity, printing speed, amount of electricity stored in the high-capacity capacitor 8, etc. is exceeded, the output timing of the strobe signal is controlled depending on the degree of exceedance.

Reference value T+ = f (EI, V, Ex) EI: Amount of electricity supplied from the power supply unit for printing one line ■ = Printing speed of the recording head (also related to the printing time for one line) E,: To the capacitor Amount of Electricity Accumulated To explain this control in detail using the operation sequence shown in Fig. 2, first, while the strobe signal is being output, one line of record data to be printed next is transferred from the CPU to the thermal head 3. and after the strobe signal output ends,
The recording paper is line-fed by one line by the platen drive motor 4. At that time, the number of "1'degrees" of the recording data to be printed on this line is counted by the AND circuit 6 and the carantuff, and both this count value and the count value of the previous line are combined with the power capacity of the power supply unit 5 and the print data. When the reference value T determined by the speed and the storage capacity of the high-capacity capacitor 8 is exceeded, the strobe signal for printing is output with a delay of Δt depending on the degree of exceedance by the control section.

Standard value] ゛ is the current capacity rating of 1 line printing rate 3
The power supply section 5 has a current capacity that can compensate for the current consumption of about 0%, and has a current limiting circuit (not shown) that allows the current consumption to flow only for the printing rate of about 30%, and the printing speed of one line. It is determined by the capacity of the high capacity capacitor 8 for supplementing the power supply current of the line type thermal head 3. In other words,
Reference value Pr.

If the current exceeds the reference value 1゛1, the power supply capacity of the power supply unit 5 is not enough to support the current, and the high capacity capacitor 8 is used to supplement the current. Printing of the next line is delayed by the time Δ until the high capacity capacitor 8 can replenish the power supply current of the thermal head 3.

Note that, unlike this embodiment, the function of detecting recorded data is added to the conventional control system by using program software as shown in FIG. 3, for example, without using the AND circuit 6 and the counter 7. The object of the present invention can also be achieved by this.

Also, under normal usage conditions, the maximum printing rate is approximately 25 to 3
The power supply capacity of the power supply unit 5 can normally be covered by the power supply capacity of the power supply unit 5 by making it slightly larger than this, and only when the printing rate is particularly high can the strobe signal be output. Since the time interval of
This does not extend to the point where the printing speed becomes extremely slow.

[Effects of the Invention] As is clear from the detailed description above, according to the control method of the line type recording head according to the present invention, even when printing all of one line, power output watts ≧ printed dot consumption watts. No power supply is required, and the capacity of the power supply unit can be reduced. Therefore, it is possible to reduce the cost and reduce the cost of the device, and also to save power consumption.

[Brief explanation of the drawing]

1 to 5 show embodiments embodying the present invention. FIG. 1 is an electronic control block diagram of a line type thermal head according to the present invention, and FIG. 2 is an operational sequence diagram thereof. FIG. 3 is an example of a control software program used as another control means according to the present invention, FIG. 4 is an electronic control block diagram of a conventional line type recording head, and FIG. 5 is a sequence diagram thereof. In the figure, 1 is a CPU section, 2 is a decoding circuit, 3 is a line type thermal head, 4 is a platen drive motor, 5 is a power supply section, 6 is an AND circuit, and 7 is a counter. Patent application: Katsuni Kawashima, President and Director of Brother Industries, Ltd. 3 Figure

Claims (1)

[Scope of Claims] 1. A control method for a line-type recording head in which recording data is printed line by line on a recording paper from a print head in synchronization with a strobe signal, wherein the control method for printing the recording data by the recording head It is equipped with a power supply unit that supplies the necessary electricity, and a capacitor that stores the electricity that is not consumed by the recording head to print the recorded data out of the amount of electricity supplied from the power supply unit, and is used for one line to be printed next. A control method for a line type recording head, characterized in that when the amount of electricity required to print the recorded data exceeds the amount of electricity supplied from the power supply section, the electricity stored in the capacitor is controlled to be consumed. . 2. When the amount of electricity required to print one line of recorded data to be printed next exceeds the sum of the amount of electricity supplied from the power supply and the amount of electricity stored in the capacitor, the amount of electricity that exceeds 2. The control method for a line type recording head according to claim 1, wherein the output timing of the strobe signal is controlled to be delayed until the strobe signal is stored in the capacitor from the power supply section.