JPS62189172A - Printing controlling system - Google Patents

Abstract

PURPOSE:To securely prevent a coil from being burned and contrive a higher printing speed, by correcting a reference temperature according to a driving density and the position relative to a temperature sensor for each of magnet coils, comparing the reference temperature with a detected temperature and controlling a printing operation. CONSTITUTION:Memories 302-324 store the numbers of times P2-P24 magnet coils 202-224 are driven in printing one line, respectively. A memory 14 stores the total number of times N the magnet coils can be driven in printing one line. Memories 402-424 store reference temperatures TM according to the positions of the magnet coils 202-224 relative to a thermistor 3 and driving densities (m), respectively. When printing in the preceding line is finished, a detected temperature TH is compared with a standard reference temperature T0, and when TH>T0, a printing operaton is suspended until TH is lowered to T0. When TH<=T0, the driving density P2/N of the magnet coil is first calculated from P2 for pin-2 and N, and a corresponding reference temperature T2 is read from a table 402. When TH>T2, printing is suspended for a predetermined period of time, and then printing in the next line is performed. When T2>=TH, the same processing is performed for pin-3, and so on.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Minute Hand The present invention relates to a dot impact printer equipped with a magnetic coil in the print head, and a print control system that controls printing operation according to the detected temperature of the print and rad. Regarding the method.

(b) Conventional technology As disclosed in Japanese Utility Model Application Publication No. 58-136339, in conventional dot impact printers, a thermistor is attached as a temperature sensor to the print head in order to prevent the print head's magnetic coil from burning out. When the temperature detected by this thermistor is lower than a fixed reference mL degree, the printing operation is continued, and when it is higher, the printing operation is stopped.

(Problem to be solved by the Know invention Generally, a plurality of magnet coils are arranged in a ring, but the thermistor as a temperature sensor is only visible in a part of the print head.

For this reason, even if the temperature of a magnet coil that is far away from the thermistor increases, the temperature detected by the thermistor does not reflect the temperature increase very much.Furthermore, because the heat capacity of the print head is large, there is a delay before detection. Therefore, the reference temperature had to be set much lower than the heat resistance longitude of the coil.Therefore, there was a problem that the printing speed decreased.

B) Means for Solving the Problems The present invention provides a dot impact printer in which a print head is equipped with a plurality of magnetic coils corresponding to a plurality of printing pins, and a temperature sensor is attached to a part of the print head. means for calculating a drive density for each of the plurality of magnet coils; a correction means for correcting a reference temperature according to the drive density and the position of each magnet coil with respect to the temperature sensor; The apparatus includes a comparison means for comparing the reference temperature and the temperature detected by the temperature sensor, and the printing operation is controlled based on the comparison result.

(E)) Effect In the present invention, a reference temperature is set for each magnet coil according to its driving density and its position with respect to the temperature sensor, and the detection is performed by comparing i with each reference temperature, so that the flexibility can be controlled. The control point can be set high, which increases the printing speed.

(f) Embodiment FIG. 1 is a block diagram showing the configuration of a serial type dot impact printer as an embodiment of the present invention.
) is the magnetic coil (2) corresponding to the 1st printing pin.
01) is placed at the top, and in a clockwise direction, the magnetic coils (203), (205), (2
23), and counterclockwise, pin 2, pin 4.

...... Magnet coils (202) (204) ... (22) corresponding to 24 pins and even numbered printing pins
4) is a print head arranged in an annular shape, (3) is a thermistor as a temperature sensor installed near the magnet coil (201) of the print head 11), (4)
is an A/D converter that converts the voltage change of the thermistor (3) into a digital quantity, and (5) is a C P that controls the printing operation.
U, t6) is a print buffer that stores print data;
(7) is the magnetic coil (201) of the print head (1).
) to (224), (8) and \9) are CR motor drive circuits and LF motor drive circuits that drive the CR motor and LF motor, respectively; [101 (11) α2 is This is an interface, and current is passed through the thermistor (3) from the power supply voltage v0 through the resistor (1j), and the temperature T of the print head (1) is detected from the voltage change due to the change in resistance of the thermistor (3).

Furthermore, in FIG. 1, (302) (303)...
...(324) is each magnet coil (202X203) except magnet coil (201)...
224), a memory for storing the number of times each magnet coil can be driven in one row Pt+P3q...PH1, a memory for storing the total number of times N that the magnet coils in 11 rows can be driven in 04, (402) (403)・
...(424) is the magnet coil (202) (
203')... (224), and is a table in which a reference diopter TM corresponding to the position of the magnet coil with respect to the thermistor (3) and the driving density m is stored in advance.

Next, the operation of this embodiment will be explained.

When printing, the CPU t5) scans the print data in the print buffer (6) and selects it to the interface 01). If the print data is data for driving the magnet coil, for example "1", the memo IJ
The corresponding contents of (302) to (324) are incremented, and each time data is set to interface U, the contents of memo IJ (t41) are incremented.
02) to (324) are P? 5PSs...P
H1 will be stored, and N will be stored in the memory.

When the printing operation of the previous line is completed in this way, the CPU (
5) performs the process shown in the flowchart of FIG. 2 before printing the next line.

That is, the detection severity T and I obtained through the A/D converter (4) are the standard reference temperature T. For example, it is determined whether the temperature is higher than 100° C., and if T, I>To, the printing operation is stopped until the TTI reaches To, as in the conventional case.

However, when T B
Then, calculate the drive density m2=P,/N of the 2-pin magnet coil (202), and then refer to the table (402) corresponding to the 2-pin to find the reference temperature corresponding to the drive density P2/N. Read T2 and find the standard reference temperature T. Correct. Then, this reference product 11T2 and the detected temperature TI
! If T w > T t, then the predetermined time,
For example, printing is paused for about 0.5 seconds, and after the pause, the next line is printed. When starting printing the next line, the process shown in the flowchart of FIG. 2 is performed in exactly the same manner.

If the reference temperature T2 of pin 2 is T2≧TM, then
3-pin memo IJ (303) Based on content P3, 3
Calculate the driving density of the pins m 3 "" P, l/N, read the reference temperature T from the table (403), and set the TI
I>T.

Make a judgment. Similar processing is performed for pins 4 to 24 below μ, and if T≦T0, printing of the next line is executed without pausing for a predetermined time.

By the way, tables (402) (403)...
・The contents of (424) are as shown in the example shown in Figure 3.
As the position of the magnet coil corresponding to each table is farther away from the 1-pin magnet coil (201) to which the thermistor (3) is attached nearby, the reference temperature TM becomes lower and the driving density m becomes higher. The reference temperature T is set to decrease as the temperature increases. For example, even if the drive density am is the same and is 80% to 90% tare, the table (402) corresponding to the magnet coil (202) near the thermistor (3) has "100°C" as T2.
is remembered, but far away from McNett Coil (224)
The corresponding Chiful (424) has "75" as T24.
°C" is memorized. Also, the same table (424
), when the driving density m24 is 50% to 60%, T
24 is r90℃, but at 90% to 100% T2
4 is "75°C".

Therefore, if the number of times the magnet coil that is farther away than the thermistor (3) is driven during one line printing increases, T and T become T.

Even if the temperature is lower than -100° C., the printing operation is stopped and one burnout of the magnet coil is reliably prevented.

By the way, when using a fixed reference temperature as in the past,
The temperature cannot be set as high as 100°C, but must be around 75'C. For this reason, the printing pause period increases, but in this embodiment, if the magnetic coil close to the thermistor is driven or the distant magnetic coil is driven fewer times, the temperature can reach 75°C.
Printing is also performed on μ without any pause period.

In the above embodiment, the reference temperature T of pin 1.

T regardless of the driving density. Since it is closed, the memory and table corresponding to 1 pin are omitted, but they may be provided in the same way as under 2 pin μ. Furthermore, if the magnetic coils are close to each other, the contents of the table may be the same, and in such a case, a plurality of magnetic coils may also serve as a table.

(G) Effects of the Invention According to the present invention, it is possible to reliably prevent burnout of the magnet coil and to improve printing speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a flowchart showing the processing contents of this embodiment, and FIG. 3 is a diagram showing a specific example of a table. (1)...Print head, (201) to (224)
... Magnet coil, (3) ... Thermistor,
(5)...CPU. (1,0) (11) (12... interface,
(302) to (324) (14)...Memory, (
402) to (424)...Table. Applicant Sanyo Electric Co., Ltd. and 1 other agent Patent attorney Shizuo Sano fi, '; 2 1": J Shin 3

Claims (1)

[Claims] (1) In a dot impact printer in which a print head is equipped with a plurality of magnetic coils corresponding to a plurality of printing pins, and a temperature sensor is attached to a part of the print head, for each of the plurality of magnetic coils,
means for calculating a driving density; correction means for correcting a reference temperature according to the driving density and the position of each magnet coil with respect to the temperature sensor; 1. A printing control method characterized by having a comparison means for comparing the detected temperature with the detected temperature, and controlling the printing operation based on the comparison result.