JP2004098617A - Dot impact printer, control method therefor, program for performing control method and recording medium on which program is recorded - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the voltage drop of a drive power source even at the time of high density printing becoming large in power consumption without applying large operation load to a CPU. <P>SOLUTION: A dot impact printer is equipped with an impact head provided on a carriage to move along the carriage to perform printing at every one line and a receiving buffer for storing the printing data received from the outside. It is detected whether printing data controlled by a predetermined character code or a predetermined control code is present in the printing data corresponding to one line of the carriage among the printing data stored in the receiving buffer (S103-105) and, even when one printing data is detected, the printing moving speed of the carriage of the line is set so as to become slower than a predetermined standard speed (S106). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dot impact printer, a method for controlling a dot impact printer, a program for causing a computer to execute the control method, and a recording medium on which the program is recorded.
[0002]
[Prior art]
The dot impact printer has an impact head including a large number of pins constituting an impact head and a solenoid coil for individually driving each pin.Electric current is supplied to the solenoid coil to pass each pin through an ink ribbon. Printing is performed by hitting the printing paper. For this reason, when performing high-density printing in which a large number of pins are driven in a short time, it is necessary to energize a large number of solenoid coils at the same time, and a large power consumption causes a voltage drop of a driving power supply. Sometimes. When such a voltage drop occurs, the driving force of the pins is weakened, causing problems such as blurred or missing printed characters. Therefore, conventionally, for example, a circuit for detecting a voltage drop is provided, and when the drive power supply drops below a predetermined voltage, printing is stopped and the power supply voltage is waited until the power supply voltage is recovered (Japanese Patent Application Laid-Open No. H10-157210). 1). However, in this method, even if the power supply voltage is recovered once, a voltage drop may occur again when printing is restarted. In such a case, the stop and restart of the printing operation are repeated. For this reason, the printing efficiency may be deteriorated as a whole, and the throughput may be reduced.
[0003]
In order to solve such a problem, before printing, the number of dots of characters and images to be printed is counted, and when the counted value exceeds a predetermined value, the printing speed is set lower than the standard speed. Has been proposed (see Patent Document 2). According to this method, when printing a character or an image having a large number of dots, the number of pin drives per unit time can be reduced to prevent a sudden increase in power consumption, thereby suppressing a voltage drop. . For this reason, the stop and restart of the printing operation do not have to be repeated, and printing with high overall throughput can be performed.
[0004]
[Patent Document 1]
JP-A-60-21265
[0005]
[Patent Document 2]
JP-A-6-977
[0006]
[Problems to be solved by the invention]
However, the counting of the number of dots must be performed for each predetermined printing range (for example, for each line), and the CPU requires a considerable computational load to perform the process of counting the number of dots. For this reason, when a CPU that does not have an arithmetic processing unit using hardware such as an ASIC or a CPU that has a low processing speed is mounted on a printer, it takes a long time to perform the process of counting the number of dots each time. The printer throughput may be reduced.
[0007]
The present invention has been made in view of such circumstances, and in a dot impact printer, it is possible to prevent a voltage drop of a driving power supply even during high-density printing in which power consumption increases without applying a large calculation load to a CPU. The purpose is to be.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a dot impact printer according to the present invention is provided.
An impact head that is on the carriage, moves together with the carriage, and prints one line at a time;
A reception buffer for storing print data received from outside;
When all the character codes included in the one-line print data of the carriage among the print data stored in the reception buffer are one-byte code characters, a predetermined character code is included in the one-line character code. Detecting means for detecting whether or not is present;
When the detecting means detects at least one of the predetermined character codes in the character codes of the one line, a control for setting a printing movement speed of the carriage on the line lower than a predetermined standard speed. Means.
[0009]
Further, the dot impact printer according to the present invention,
An impact dot head that is on the carriage, moves with the carriage, and prints one line at a time;
A reception buffer for storing print data including a control code and print data received from outside,
Detecting means for detecting whether print data of one line of the carriage among print data stored in the reception buffer includes print data controlled by a predetermined control code,
When the detecting means detects at least one piece of print data controlled by the predetermined control code in the print data for one line, the print moving speed of the line of the carriage for the line is set to a predetermined value. Control means for setting a speed lower than the standard speed of
Is provided.
[0010]
According to the present invention, when a character code of a character having a large number of dots causing a drop in the power supply voltage or print data subjected to control that may cause an increase in the number of dots is detected, the carriage printing is performed. By reducing the moving speed, a voltage drop of the driving power supply can be avoided. Further, the processing for detecting a preset character code or control code from the print data requires a smaller calculation load than the conventional processing for counting the number of dots. Therefore, the print moving speed setting process does not take much time, and printing can be performed smoothly.
[0011]
Further, in the present invention, the predetermined control code includes at least one of a code for decorating characters, a code for designating a download character set from outside, and a code for instructing printing of a bit image. It may be.
[0012]
Further, according to the present invention, there is provided a temperature detecting means provided in the vicinity of the impact head, wherein the control means controls a printing movement speed of the carriage and a pause between lines of the carriage according to a temperature detected by the temperature detecting means. Means for setting at least one of the times may be included. With this configuration, it is possible to set the printing speed in consideration of the temperature of the impact head, and it is possible to more reliably prevent a voltage drop of the driving power supply.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a block diagram showing a system configuration of a dot impact printer (hereinafter, simply referred to as a printer) 10 according to an embodiment of the present invention. The printer 10 includes a CPU (central control unit) 12, an interface 14, a ROM 16, a RAM 18, an impact head 20, a head control unit 22, a carriage 24, a carriage motor 26, a carriage motor control unit 28, a temperature sensor 30, a sensor signal processing unit 32 , A paper feed control unit 34, a drive power supply 50, and the like.
[0014]
The ROM 16 stores a control program for controlling the printer 10 and various data such as bit pattern data of print characters. The CPU 12 controls each unit of the printer 10 by reading out and executing the control program from the ROM 16. A host computer 36 is connected to the interface 14, and the printer 10 receives various data such as print data and commands from the host computer 36 through the interface 14. The RAM 18 includes a reception buffer 18a for storing print data such as control codes and print data received from the host computer 36, and bit image data obtained by expanding print data for one line to be printed from now on. A print buffer 18b for storing is provided.
[0015]
The CPU 12 sequentially reads out the print data stored in the reception buffer 18a, and performs a printing process according to the print data and the control code included in the print data. Specifically, the CPU 12 develops one line of print data into bit image data by referring to the bit pattern data of the character stored in the ROM 16 and stores it in the print buffer 18b. Then, based on the bit image data in the print buffer 18b, a command is issued to the head control unit 22, the carriage motor control unit 28, and the paper feed control unit 34 to execute the printing process.
[0016]
The head control unit 22 controls the drive of the impact head 20 based on the bit image data stored in the print buffer 18b and prints on the printing paper 38 according to a command from the CPU 12.
[0017]
The impact head 20 is a head including a plurality of pins each driven by a solenoid, and each pin corresponds to one dot of printing. Therefore, according to the bit image data, the solenoid coil corresponding to the pin to be driven is energized, and the pin is hit on the printing paper 38 via the ink ribbon 40 to perform printing.
[0018]
The carriage motor 26 is connected via a pulley 42 and a timing belt 44 to the carriage 24 on which the impact head 20 is mounted. The carriage 24 is configured to move in the width direction of the printing paper 38 according to the rotation of the carriage motor 26. The carriage motor control unit 28 drives and controls the carriage motor 26 in accordance with an instruction from the CPU 12 to move the carriage 24 in the width direction of the printing paper 38 in synchronization with the printing operation of the impact head 20.
[0019]
The paper feed controller 34 drives the paper feed roller 46 constituting the paper feed mechanism to rotate, and conveys the printing paper 38 in synchronization with the printing operation by the impact head 20.
[0020]
Further, the temperature sensor 30 is a temperature detecting element such as a thermistor disposed near the impact head 20. The temperature sensor 30 outputs a detection signal corresponding to the temperature of the solenoid coil of the impact head 20 to the sensor signal processing unit 32. The sensor signal processing unit 32 A / D converts a detection signal from the temperature sensor 30 and supplies the signal to the CPU 12.
[0021]
The drive power supply 50 supplies a power supply necessary for the operations of the above-described units. Among them, the power consumption of the head control unit 22 is particularly large because the solenoid coil provided in the impact head 20 is energized, and the power consumption of the head control unit 22 is reduced when the printing with a high dot density is performed. There is a possibility that the capacity of the power supply will exceed 50 and the power supply voltage will drop.
[0022]
On the other hand, in the printer 10 of the present embodiment, in order to prevent a voltage drop of the driving power supply 50, when printing a character having a large number of dots, a character having an unknown number of dots, a bit image, or the like, the printing speed is reduced. I try to restrict. That is, when the number of dots of the character is large, the number of pins to be driven by the impact head 20 is increased, and accordingly, the amount of power to the solenoid is also increased. By limiting the speed, a voltage drop of the driving power supply 50 is avoided.
[0023]
In this embodiment, three types of printing speeds are set as (1) characters having a large number of dots, (2) decorative characters, and (3) download characters, bit images, and NV bit images.
[0024]
(1) Characters with many dots
In the present embodiment, a character whose number of dots of one character is, for example, 25 dots or more is set as a print speed restriction target.
FIG. 2 shows a part of a character code table of characters that can be printed by the printer. As an example, a character code table corresponding to a character code page number “0” (PC437 (USA: Standard Europe)) Is shown. In this character code table, the characters indicated by the circles in the figure, that is, the characters of the character codes “B2h”, “DBh”, “DCh” and “DEh” are characters having a dot number of 25 dots or more. Characters are set as print speed restriction targets.
[0025]
Here, the printing speed is limited for characters of 25 dots or more for the following reasons. That is, in the printer 10 of the present embodiment, the impact head 20 has nine pins provided in a line in a vertical direction, and one character is constituted by a dot matrix of seven dots in the horizontal direction. Also, three dots are taken as spaces between each character. Further, even if the same pin is driven immediately after driving the pin to print one dot, the adjacent dot cannot be continuously printed because the carriage moves by one dot or more during that time. That is, printing can be performed only every other dot at the maximum in the horizontal direction. Therefore, when performing full solid printing, one character is composed of 9 × (7 + 3) / 2 = 45 dots. (When performing full solid printing, the space between characters is also printed. The number of dots is (7 + 3) dots.) Therefore, the printing speed is limited for characters of 25 dots or more, using approximately 60% of the number of dots 45 in full solid printing as a guide.
[0026]
Note that the character codes “20h” to “7Fh” are common to all pages, but in this range, there are no characters with a dot number of 25 or more, so they are not set as print speed restriction targets.
[0027]
FIG. 3 is a list showing a list of character codes of characters having a dot number of 25 dots or more for all pages of the character code. In FIG. 3, the pages with the page numbers “254” and “255” are pages that are individually customized and defined for each user. Therefore, all the characters on these pages have an undetermined number of dots. Therefore, in this embodiment, all the characters on both pages are set as print speed restriction targets. Note that which page's character code is used is set, for example, in response to a command from the host computer 36.
[0028]
The printer 10 of the present embodiment stores information indicating whether or not each character code corresponds to a print speed restriction target as a code table TBL as shown in FIG. 4 in a storage unit such as the ROM 16, for example. . The code table TBL is provided corresponding to each page number “0” to “255” of the character code table. For example, the code table TBL0 corresponds to the page number “0”, and the code table TBL1 corresponds to the page number “1”.
[0029]
Each code table TBL is composed of 16 elements [0] to [15], and each element is represented by 8 bits. Therefore, each code table TBL is represented by 128 bits, and each bit corresponds to each character code of “80h to FFh” in the character code table. That is, taking TBL0 corresponding to page number "0" as an example, 8 bits of TBL0 [0] correspond to character codes "80h" to "87h" in order from the upper bit side, and 8 bits of TBL0 [1]. Correspond to the character codes "88h" to "8Fh" in order from the upper bit, and the eight bits of TBL0 [2] correspond to the character codes "90h" to "97h" in order from the higher bit. If the value of the bit corresponding to a certain character code is “1”, it indicates that the character code is subject to printing speed limitation, and if “0”, the character code is not subject to printing speed limitation. Show.
[0030]
For example, in the character code table for the page number “0” shown in FIG. 2, the printing speed restriction target characters are the character codes “B2h”, “DBh”, “DCh”, and “DEh”. A code table TBL0 [6] corresponding to a range of "B0h" to "B7h" including "B2h" and a range of "D8h" to "DFh" including character codes "DBh", "DCh" and "DEh". Corresponding code table TBL0 [11] stores data "20h" and data "1Ah", respectively (a rectangular frame in the figure). In other elements of the code table TBL0, data “00h” indicating that there is no printing speed limit setting character is stored.
[0031]
The meaning represented by data "20h" and data "1Ah" will be described with reference to FIG. As shown in the figure, in the code table TBL0 [6] (“B0h” to “B7h”), the character “B2h” to be subjected to the printing speed limitation corresponds to the third bit from the highest order. If this bit is “1”, it becomes “00100000”, which is “20” when expressed in hexadecimal. Similarly, in the code table TBL0 [11] (“D8h” to “D7h”), the fourth to fifth bits and the fifth to fifth bits corresponding to the characters “DBh”, “DCh”, and “DEh” to be subjected to character printing speed restriction When the first and seventh bits are represented by a hexadecimal number with “1”, “1Ah” is obtained.
[0032]
By storing the characters to be subjected to the printing speed limitation in the bitmap data format in this way, it is possible to store which character corresponds to the object to be subjected to the printing speed with a minimum necessary data amount, and the memory capacity is reduced. Can be saved.
[0033]
In the present embodiment, a character having a dot number of 25 or more is set as a print speed restriction target. However, the reference dot number is not limited to 25 dots, and may be appropriately selected. In the present embodiment, as described above, one character is assumed to be 9 × 7 dots and the space between characters is three dots, and 25 dots are used as a reference according to the number of dots 45 in full solid printing. The present invention is not limited to this. For example, the number of dots per character may be 9 × 9, and the number of dots between characters may be two in addition to three. Therefore, even in the case of these dot configurations, the number of dots serving as a reference for limiting the printing speed may be determined according to the number of dots in full solid printing. Further, for example, if the capacity of the driving power supply 50 is large, the capacity will not be insufficient even when printing at a higher density, so that even with the same dot configuration, a larger number of dots (for example, 30 dots) or more is printed. The speed can be limited.
[0034]
▲ 2 ▼ Decorative characters
Decorative characters include underlined characters and double-width characters such as double-width characters and double-width characters. When such decoration is applied, there is a possibility that the print duty may increase due to the decoration. The decorative character is specified by a predetermined control code (character decoration code) representing the decoration content. In other words, when a certain character decoration code is sent from the host computer 36, the character code until the control code designating the decoration release appears thereafter is printed with decoration according to the character decoration code. . Therefore, when the character decoration code is detected in the print data of one line, the CPU 12 can determine that the decoration line is included in the current print line, and the character decoration of the previous line is performed. Even when the process proceeds to the current line as it is, it can be determined that the decoration line is included in the current print line. The decorative character code and the control code for canceling it are stored in a storage unit such as the ROM 16.
[0035]
(3) Downloaded character, bit image, NV bit image
The download character is a character set by a user or the like, that is, an external character, and is registered in the printer by a command from the host computer 36 or the like. The bit image is print data transmitted from the host computer 36 in the bit image format. Further, the NV bit image is image data recorded in a nonvolatile memory in the printer 10. Regarding these downloaded characters, bit images, and NV bit images, the number of dots is unknown from the print data, and the number of printed dots may increase. Therefore, these are set as print speed restriction targets.
[0036]
The download character is specified by a predetermined control code. That is, similarly to the case of the decorative character, when the control code for designating the download is sent from the host computer 36, the print data until the code for designating the release of the download character is sent thereafter is the downloaded character. Printed as Similarly, the printing of the bit image and the NV bit image is designated by the corresponding control code, and when these control codes are sent from the host computer 36, a code for canceling the bit image printing is then sent. The print data until it is read is printed as a bit image. Therefore, when a control code designating printing of a download character or a bit image / NV bit image is detected in one line of print data, the CPU 12 outputs the download character or the bit image / NV bit image to the current print line. It can be determined that an image is included, and even if the previous line moves to the current line with the download character or bit image specified, the download character or bit image / NV bit image Can be determined to be included. A control code for designating a download character, a bit image, and an NV bit image, respectively, and a control code for canceling them are also stored in the storage unit such as the ROM 16.
[0037]
In the present embodiment, it is assumed that print data transmitted to the printer 10 includes only an ANK character code (one-byte character code) as a character code, and when printing a kanji code other than the ANK character code, The above printing speed limitation is not performed.
[0038]
FIG. 6 is a flowchart illustrating an example of a process executed by the CPU 12 to determine whether or not to limit the printing speed in the printer 10. This routine is executed every time one line of print data is printed. First, the CPU 12 sets the printing speed to a predetermined standard speed (S100). Then, the print data of the first character of one line is obtained from the print buffer (S101), and it is determined whether the speed limit is set to be valid (S102). As a result, if the speed limit is set to be valid, the process proceeds to S107 described below. On the other hand, if the speed limit is not set to be valid, it is determined whether or not the print data is a decorative character (S103). Here, whether or not a character is a decorative character is determined based on whether or not a character decoration code appears and before a code for releasing the character decoration appears. Specifically, a flag indicating whether the character is a decorative character is prepared. In step S103, if the print data is a decoration character code, a flag is set. If the print data is a code for releasing character decoration, the flag F1 is reset. Is set as a decorative character. As a result, it is possible to determine that a decorative character is included not only when the current line includes the decorative character code but also when moving to the current line with the character decoration specified in the previous line. As a result of the determination processing in S103, if the character is a decorative character, the speed limit is set to valid (S106). On the other hand, if it is not a decorative character, it is next determined whether or not the character is a download character, a bit image, or an NV bit image (S104). Here, for the determination as to whether or not the character is a download character, a bit image, or an NV bit image, similarly to the case of the decorative character determination in S103, corresponding flags are prepared, and the setting of each flag is performed. This can be performed based on a reset process. As a result, if it corresponds to any of the download character, the bit image, and the NV bit image, the speed limit is set to be valid (S106). On the other hand, if none of the above applies, it is next determined whether or not it corresponds to a print speed limited character (S105).
[0039]
FIG. 7 is a flowchart illustrating an example of a process for determining whether a character corresponds to a print speed limited character. As shown in the figure, first, a value obtained by subtracting “80h” from the character code is shifted right by 3 bits (S150). As described above, in the code table TBL, information on each character whose character code starts with “80h” is stored corresponding to each bit of 8 bits per element. Shifting to the right by 8 bits means dividing by "8". Therefore, by the processing of S150, the element number of the element in the code table TBL that contains the character code to be determined is obtained.
[0040]
Next, the remainder obtained by dividing the value obtained by subtracting "80h" from the character code and "07h" by "8" is obtained (S152). This surplus value indicates which bit in the element of the code table TBL obtained in S150 the character code corresponds to.
[0041]
Next, with respect to the code table TBL corresponding to the currently set page number, the value of the bit position obtained in S152 of the element number obtained in S150 is referred to (S154). It is determined whether it is "0". As a result, if the value is “1”, it is determined that the character corresponds to the print speed limited character, and if the value is “0”, it is determined that the character does not correspond to the print speed limited character.
[0042]
Returning to the flowchart of FIG. 6 again, if it corresponds to the print speed limit character in S105, the speed limit setting is set to valid (S106). On the other hand, if it does not correspond to the print speed limit character, it is checked whether or not one line has been completed (S106). If not, the next print data is obtained (S108) and the process returns to S102.
[0043]
Next, a procedure for setting the printing speed of the printer 10 will be described.
FIG. 8 is a flowchart illustrating an example of a process executed by the CPU 12 to set a printing speed in the present embodiment. FIG. 9 is a printing speed setting table referred to in the routine of FIG. As shown in FIG. 8, the CPU 12 first confirms whether the printing speed limitation is valid / invalid (S301), and further detects the temperature of the impact head 20 based on the detection signal of the temperature sensor 30 (S302). Then, a print mode according to the temperature of the impact head 20 is selected (S303), and the moving speed of the impact head 20 and the inter-line pause time are set based on the presence or absence of these print speed restriction settings and the selected print mode. (S304).
[0044]
Here, as shown in FIG. 9, the four print modes of “low-temperature mode”, “standard mode”, “high-temperature mode” and “high-temperature / low-temperature mode” are used as the above-described print modes according to the temperature detected by the impact head 20. Modes are prepared, and information indicating the printing speed is set for each mode according to whether or not the printing speed limit is set. In the example of FIG. 9, in the “standard mode”, the moving speed of the impact head 20 is set to about 210 ms / line when the printing speed limit is valid, whereas when the printing speed limit is not valid (normal In the case of print setting), the moving speed is set to about 280 ms / line. In the “high-temperature mode”, the line pause time of the impact head 20 is set to 60 ms when the print speed restriction is valid, whereas the line pause time is set to 400 ms when the print speed restriction is not valid. I do. In the “high-temperature low-speed mode”, the line pause time of the impact head 20 is set to 730 ms when the print speed limit is not set, whereas the line pause time is set when the print speed limit is set. Set the time to 1500 ms. As described above, when the print speed limitation is effective, the print speed is set to be lower than that in the case of the normal print setting (that is, the head moving speed is slowed, or the line pause time is lengthened). I have to. However, in the “low temperature mode”, no difference is made in the set speed depending on whether or not the print speed limit is set.
[0045]
The reason why the printing speed is changed in the printing mode according to the head temperature is to take into consideration that the power consumption of the solenoid also changes due to a change in the resistance value of the solenoid depending on the temperature. In the present embodiment, the table in FIG. 9 is set experimentally, for example, so as to obtain a suitable head moving speed and a suitable inter-row pause time in each temperature section.
[0046]
In step S304, the CPU 12 refers to the table in FIG. 9 to determine the moving speed of the impact head 20 and the pause between lines based on the four print modes and the validity / invalidity of the print speed limitation. Execute.
[0047]
As described above, in the present embodiment, characters having a large number of dots that can cause a drop in the power supply voltage, or characters that have an unknown number of dots and are likely to have a large number of dots are set as print speed restriction targets. When printing these characters, the printing speed is set lower than the standard speed. For this reason, the driving amount of the pin per unit time of the impact head 20, that is, the power consumption of the driving power supply 50 is reduced. Therefore, according to the present embodiment, it is possible to avoid a voltage drop of the driving power supply 50, and thereby it is possible to prevent a problem such as blurring of printing caused by the voltage drop.
[0048]
Further, the process of detecting a preset control code from print data requires a smaller calculation load than the process of counting the number of dots described as the above-described conventional technology. However, the printing speed setting process does not take a long time, and printing can be performed smoothly.
[0049]
Further, in the present embodiment, the printing speed is set according to the temperature of the impact head 20. For this reason, more appropriate printing speed setting can be performed in response to the power consumption of the solenoid changing with the temperature change.
[0050]
Further, in the above embodiment, the printing speed is set to two levels depending on whether or not the print-restricted characters are included. However, the present invention is not limited to this, and the number of print-restricted characters is counted. The printing speed may be set to three or more levels according to the number.
[Brief description of the drawings]
FIG. 1 is a block diagram of a printer according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of a character code table.
FIG. 3 is a list of print speed restriction target character codes of all character code pages.
FIG. 4 is a diagram showing a code table defining print speed restriction targets.
FIG. 5 is a diagram for explaining values stored in a code table.
FIG. 6 is a flowchart of a routine for determining whether to limit the printing speed.
FIG. 7 is a flowchart of a routine for determining whether a character corresponds to a print speed limited character.
FIG. 8 is a flowchart illustrating a print speed setting routine.
FIG. 9 is a table showing print speed setting information for each print mode.
[Explanation of symbols]
Reference Signs List 10 printer, 12 CPU, 16 ROM, 18 RAM, 18a reception buffer, 20 impact head, 22 head control unit, 24 carriage, 30 temperature sensor, 50 drive power supply

Claims (11)

An impact head that is on the carriage, moves together with the carriage, and prints one line at a time;
A reception buffer for storing print data received from outside;
When all the character codes included in the print data for one line of the carriage among the print data stored in the reception buffer are one-byte code characters, a predetermined character is included in the character code for one line. Detection means for detecting the presence of the code;
When the detecting means detects at least one of the predetermined character codes in the character codes of the one line, a control for setting a printing movement speed of the carriage on the line lower than a predetermined standard speed. And a dot impact printer. An impact dot head that is on the carriage, moves with the carriage, and prints one line at a time;
A reception buffer for storing print data including a control code and print data received from outside,
Detecting means for detecting whether print data of one line of the carriage among print data stored in the reception buffer includes print data controlled by a predetermined control code,
When the detecting means detects at least one piece of print data controlled by the predetermined control code in the print data for one line, the printing movement speed of the carriage in the line is set to a predetermined standard speed. Control means for setting later than
Dot impact printer with. 2. The printer according to claim 1, wherein the predetermined character code includes a character code of a character having a predetermined number of dots or more per character. 3. The printer according to claim 2, wherein the predetermined control code includes a code for decorating a character. 5. The printer according to claim 2, wherein the predetermined control code includes a code designating an externally set download character. 6. The printer according to claim 2, wherein the predetermined control code includes a code for instructing printing of a bit image. The dot impact printer according to any one of claims 1 to 6,
A temperature detecting unit provided near the impact head,
A printer according to claim 1, wherein said control means includes means for setting at least one of a printing movement speed of said carriage and a pause time between rows of said carriage according to a temperature detected by said temperature detection means. A method for controlling a dot impact printer, comprising: an impact head that is on a carriage, moves together with the carriage, and prints one line at a time, and a reception buffer that stores print data received from outside,
When all the character codes included in the print data for one line of the carriage among the print data stored in the reception buffer are one-byte code characters, a predetermined character is included in the character code for one line. Detecting whether the code is present;
Setting at least one of the predetermined character codes in the character codes of the one line to a printing movement speed of the carriage lower than a predetermined standard speed; , With the method. Control of a dot impact printer including an impact dot head that is on the carriage and moves together with the carriage and prints each line, and a reception buffer that stores print data including a control code and print data received from outside The method,
Detecting whether the print data for one line of the carriage among the print data stored in the reception buffer includes print data controlled by a predetermined control code;
When the detecting means detects at least one piece of print data controlled by the predetermined control code in the print data for one line, the print moving speed of the line of the carriage for the line is set to a predetermined value. Setting the speed lower than the standard speed of
Method with. 10. A computer mounted on a dot impact printer including an impact head that is on a carriage, moves with the carriage, and prints one line at a time, and a reception buffer that stores print data received from the outside. A program for performing the described method. A recording medium on which the program according to claim 10 is recorded.

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