JPS5987191A - Serial printer - Google Patents

Abstract

PURPOSE:To prevent the burning of an exciting coil and deterioration of drive characteristics due to the temperature rise of a motor by adding a dummy printing position to at least one of actual printing positions on a printing line when short-line printing is continously made over several lines. CONSTITUTION:In the case of usual short-line printing, a carriage is risen at a given speed V1 for a rise time tr by a controller and run in blank for a time period t0, and then actual printing positions are moved at a fixed speed for a printing time period tP2 corresponding to the number of printing letters. After the blank running, the drive motor is inversely excited and stopped. The short- line printing is continously made ver several lines, and the arrival of a given temperature is indicated by a detection signal from a temperature sensor attached to the drive motor. In the case of short lines, a dummy printing position corresponding to a dummy time td previously set is added to both sides of the actual printing position in the printing line to move the carriage and the moving time is lengthened also by the following printing data.

Description

[Detailed description of the invention] Technical field The present invention relates to serial printers.

Conventional technology Conventionally, in the above-mentioned type of serial printer, a drive motor moves a carriage to print lines on printing paper and reciprocates in both directions. It is a method of printing characters in a dot matrix format using a printing wire by selectively driving a solenoid, and - short line printing in which characters less than the fixed number of 19i characters are printed over several lines in a row. In this case, the drive motor described in +iii is supplied with a large current necessary for braking and stopping the motor in a short period of time. In addition to being unable to move to the desired printing position, the moving coil was also burnt out.

OBJECTS OF THE INVENTION In view of the above-mentioned conventional drawbacks, the object of the present invention is to enable short line printing to be performed over several lines using a simple configuration. It is possible to prevent deterioration of drive performance due to the temperature 11 of the drive motor when printing is continued, and to move the printer to the desired printing position.
The object of the present invention is to provide a serial printer that can prevent burnout of the Inm coil.

Composition of the invention The present invention will now be described according to one embodiment.

FIG. 1 is an explanatory diagram showing an outline of a serial printer according to the present invention.

In the figure, a carriage 1 is inserted and fitted so as to be reciprocally movable on a guide rod 2 fixed to a main body frame (IIiT, both not shown) parallel to the axis of the platen.

The drive motor 3 is connected to a drive pulley 5 which is rotated via a gear 4 having an appropriate reduction ratio, and a driven pulley 6 which is connected to the main body frame, and both ends of the drive motor 3 are fixed to the carriage 1. A wire 7 causes the carriage 1 to move back and forth in both directions along the printing lines of the printing paper 8.

The printing spatula 1<9 is placed and fixed on the mI carriage l, and a number of F4k solenoids selectively drive printing wires (none of which are shown) to print characters in a dot matrix format.

Figure 2 is an electrical block diagram of the serial printer, Figure 3 is a flowchart showing the operating status, and Figure 4 (A) and C.
B) is an explanatory diagram showing the moving state of the carriage in normal printing form f island, Fig. 5 (A), CB) is an explanatory drawing showing the moving state of the carriage during short line printing, Fig. 6 (A, )・(B) is an explanatory diagram showing the moving state of the carriage during short line printing with increasing tummy printing position, and FIG. 7 is an explanatory diagram showing the temperature state of the drive motor.

In the figure, the control device 10 stores 11 print data PD input manually from an external device 11 such as a keyboard or a host computer in a buffer memory 12, and print data PD for printability is stored in the buffer memory 12. When the data is written, a command signal DS is output to the drive circuit 3 based on the print data PD for one print line accessed from the buffer memory 12 to rotationally drive the drive motor 3, and the carriage 1 is moved to the printing paper. At the same time, the dot pattern data DPD corresponding to the print data PD is accessed from the pattern memory 10a and outputted to the print γ head 9, and the print wire M l<open. Characters are printed by driving. Note that 1) the control device 10 stores the print data FD of the next print line input from the external device 11 during the printing operation in the buffer memory 12;

” - When the number of printed characters in one printing line is greater than or equal to a predetermined number when the carriage 1 moves, the control device 10 operates as shown in FIG.
A) - Rising time trt shown in (B) After the iron carriage 1 is started up to a predetermined speed V1 and run idle at the predetermined speed V1 for a idle running time to, a printing time corresponding to the number of characters to be printed is determined. During tpl, the carriage l is moved at a constant speed at the actual printing position. After the carriage 1 is run idle at a predetermined speed v1 for a idle running time to of 111 seconds, the drive motor 3 is reverse excited and stopped at a braking time tf.

- In the case of short line printing where the number of printed characters in a printing line is less than a predetermined number (for example, 5 characters or less), the control device 10 operates at the rise time tr shown in FIGS. 5(A) and CB) in the same way as the above operation. After raising the carriage 1 to a predetermined speed v1 and running it idle at the predetermined speed v1 for a idle running time to,
During a printing time tp2 corresponding to the number of printed characters, the actual printing position is moved at a constant speed. After the carriage 1 runs idle at a predetermined speed v1 of 1r+1 for a idle running time to, the drive motor 3 is reverse excited and stopped at a braking time tb.

When the above-mentioned short line printing continues over several lines, a large current is supplied to the drive motor 3 within a short period of time, so the motor temperature of the drive motor 3 changes due to its drive characteristics as shown in FIG. When the control device 1 is near the limit 7B degree TQ which causes deterioration or burnout of the excitation coil, the control device 1
As shown in FIG. 3, 0 means that the motor humidity reaches +ii+recorded limit 1iIA degrees TQ or above 7 points 1 constant temperature T1 based on the detection signal SS from the temperature sensor 14 such as a thermocouple attached to the drive motor 3. I'll determine whether or not the t'l
If the determination is NO, please refer to Figure 4 or 5 mentioned above.
The carriage 1 is moved according to the operation shown in the figure. On the other hand, if the above-mentioned 1st determination is YES, r11 determines whether or not short lines are printed based on the print data PD manually inputted from the first part device 11, and if the I'11 determination is NO,
Move the carriage 1 in the same manner as above. On the other hand, if the determination is YES, the carriage 1 is moved by adding a tamper printing position corresponding to the tamper time tcl set in advance on both sides of the actual 1-II character position in the printing line, and the carriage 1 is moved. Aim to make R time.

+(11) The control device 10 determines the rise time shown in FIG.
After the carriage 1 is set to a predetermined speed v1 at the predetermined speed v1, and the carriage 1 is run free at the predetermined speed v1 for an idle running time, the +i'+j carriage 1 is further moved for a time corresponding to the tummy printing position. Let it run idly and move to the actual printing position. Then, after the printing time tp3 has elapsed, the carriage 1 is run idle for an hour td, and then the carriage 1 is stopped for a braking time tf by reverse excitation of the drive motor 3, and the carriage 1 is stopped for a braking time tf. By lengthening the time by 1 hour td, the effective current supplied to the drive motor 3 is lowered, and the motor temperature is lowered.

As a result of the above operation, the motor 7 quality becomes constant T as shown in Fig. 7.
2, the control-AA direct weight o cancels the addition of dummy printing positions on both sides of the actual printing position, and moves the carriage 1 according to the operation shown in FIG. 4 or 5.

Therefore, in this embodiment, when the motor temperature of the drive motor 3 reaches the first predetermined temperature T1 due to short line printing, the motor temperature decreases to a constant 1 grade. The carriage 1 is moved by adding a corresponding tummy print position to prevent deterioration of the drive characteristics of the drive motor and burnout of the excitation coil.

FIG. 8 is a flowchart showing a second embodiment of the present invention. 11. Control device V: 10 is a first counter N for counting the number of printed lines of short line printing, and a tummy printing (printing line of short line printing with ljR added to ζJ) at least one of the actual printing positions. A second counter M is provided for counting the number.

And; 1. The controller lO determines whether or not short line printing is to be performed based on the print data PD stored in the buffer memory 12, and if the determination is NO, the first counter N is
After resetting the second counter M, the carriage 1 is moved according to the operation shown in FIG. on the other hand"
- If the judgment is YES, 1i! ] After counting up the first counter N, the first counter N
It is determined whether the count number has reached a predetermined temperature T1 which is below the motor limit temperature, and if the determination is NO, after resetting the second counter M, the second counter M is reset. The carriage 1 is moved according to the operation shown in FIG. On the other hand, if the above determination is YES, it is determined whether the count number of the second counter M has reached a predetermined number of rows, and the corresponding I
If the 'll setting is NO, after counting up the second counter M, add a tummy print position (=J) to at least one of the actual print positions, move the carriage 1 as shown in FIG. The effective current supplied to the drive motor 3 is lowered by lengthening the time between the 11 movements of 1, and the motor temperature is lowered.Short line printing is then continued according to the above operation, and the second counter M is When the predetermined row Hb is reached, the first counter N row and the second counter M are reset, respectively, and the carriage 1 is moved according to the operations shown in FIGS. 4 and 5.

Note that the number Q of the first counter N and the second counter M is
The candy suitable for the printer was experimentally determined by considering the drive speed and performance of the drive motor 3, the usage environment of the printer, etc. Furthermore, in the first and second embodiments described above, dummy printing positions are added to both sides of the actual printing position (16 formations), but in the present invention, a dummy printing position is added to at least one of the actual printing positions, and the motor ?i
n! It can also be implemented even if there are preparations to reduce the severity.

In the detailed description of the invention, the present invention moves the carriage on which the print head is mounted reciprocally in the +-u line (71) based on the command signal from the tiυ control AAlffr, while moving the carriage in the - print line (71). In serial printers that are capable of printing less than a predetermined number of characters on a serial printer, one
111. After the temperature of the drive motor rises, if short line printing is to be continued, add 67 positions of tummy 1-11 characters to at least one of the actual printing positions of one printing line, and feed the dummy printing position. Due to the 1m +16 formation which lowers the motor crystallinity, when short line printing continues over several lines, the motor temperature of the drive motor is increased by y1! ! This is a serial printer that can move the carriage to a desired actual printing position while preventing deterioration of dynamic characteristics, and can also prevent burning of the excitation coil.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an outline of a serial printer according to the present invention, FIG. 2 is an electrical block diagram of the serial printer,
Figure 3 is a flowchart showing the operating status, Figure 4 (A)
・(B) is an explanatory diagram showing the moving state of the carriage in a normal printing state, FIG. 5(A) ・(B) is an explanatory diagram showing the moving state of the carriage during short line printing, FIG. 6(A)・(B) is an explanatory diagram showing the moving state of the carriage during short line printing with a dummy printing position added, FIG. 7 is an explanatory diagram showing the temperature state of the drive motor, and FIG. 8 is a second embodiment of the present invention. 77 is a flowchart showing an operation state 773 of FIG. In the figure, 1 is a carriage, 3
is a drive motor, 9 is a print head, 10 is a 1liU controller, 14 is a temperature sensor, T1 is a predetermined deviation, T2 is a constant temperature, N is a counter, and a is a predetermined number. Patent applicant Brother Industries, Ltd. Agent Patent attorney Ito II+ - Figure 3

Claims (1)

[Scope of Claims] 1. A short line in which a carriage on which a print head is mounted is moved back and forth to a print line by a drive motor based on a command signal from a control device, and characters of a predetermined number or less are printed on a print line. In a serial printer that prints in a single line, after the temperature of the drive motor increases due to continuous short line printing over multiple lines, when continuing short line printing, at least one of the actual printing positions of one printing line is A serial printer in which the dummy printing position is set to (4h) by adding J and feeding the tummy printing position to lower the motor temperature. 2, l1iJR's serial printer is II! J
It has a temperature sensor that detects the flatness of the He drive motor, and when the temperature sensor detects a predetermined 1 grade and the subsequent printing line is a short line, the drive motor continues to operate until the 7 grade or less. Claim 1 characterized in that a dummy printing position is added to the printing line.
Serial printer mentioned in section. 3, Ili] The control device sets a counter (1!i) to count the number of consecutive short lines, and when the content of the counter reaches a predetermined value and the subsequent printed line is a short line, 2. The serial printer according to claim 1, wherein: 1) 11 printing positions are added for a plurality of lines.