JP2005059353A - Method of controlling on-vehicle printer and on-vehicle printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable on-vehicle printer capable of performing efficient printing by adequately considering a difference in influence of vibration to the on-vehicle printer in different directions. <P>SOLUTION: This on-vehicle printer used on a vehicle comprises a means for measuring an acceleration of a vibration acting on the printer body in one or more directions, and a means for switching a printing control mode corresponding to the magnitude of the measured acceleration of the vibration in each direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle-mounted printer, and more particularly to a vehicle-mounted printer control method and a vehicle-mounted printer that take into account the difference in the degree of influence in each direction with respect to vibration applied to the vehicle-mounted printer.

  When the car is running, the in-vehicle printer is constantly receiving vibrations, which causes air bubbles to flow from the nozzle outlet, causing the nozzles to become clogged, causing dot dropouts, and printing quality due to landing position misalignment. Cause deterioration.

  With respect to this problem, in a conventional in-vehicle printer, if vibration, impact, roll, or lateral G exceeds a set value based on signals from various sensors connected to the in-vehicle computer unit that detects the running state of the vehicle. Printing was stopped. In this way, it is possible to obtain a stable recorded image (see, for example, Patent Document 1).

However, in the conventional example, there is a case where the measured vibration is not necessarily the vibration acting on the printer body, and no consideration is given to the vibration corresponding to the characteristics of the printer vibration and the printer installation method.
JP 2001-322266 A

  The present invention has been made to solve such a problem, and its purpose is to appropriately consider the difference in the degree of influence in each direction with respect to vibration applied to the in-vehicle printer, and to be highly reliable and efficient. An in-vehicle printer control method and an in-vehicle printer capable of performing simple printing are provided.

The present invention has been made to solve the above-described problems, and the control method for an in-vehicle printer according to the present invention is a control method for an in-vehicle printer that is used by being mounted on a vehicle. The method includes a procedure of measuring acceleration of vibrations in two or more directions and a procedure of switching a print control mode according to the magnitude of the measured acceleration of vibrations in each direction.
In such a procedure, for example, an in-vehicle printer main body is equipped with an acceleration sensor that measures vibration acceleration in the front-rear direction, the left-right direction, and the up-down direction, and the acceleration of vibration in each direction is measured. The print control mode of the printer is switched according to the magnitude of the influence of the vibration on the in-vehicle printer.
As a result, it is possible to provide an in-vehicle printer that is highly reliable and capable of efficient printing by appropriately considering the difference in the degree of influence in each direction with respect to vibration exerted on the in-vehicle printer. For example, by setting the threshold value in the direction strong against vibrations (threshold value for changing the print control mode) to be high, the frequency of stopping the printing operation can be reduced, and the threshold value in the direction in which the printers are weak against vibrations is set. By setting the value low, the printing operation can be performed without impairing the printing quality.

In the on-vehicle printer control method of the present invention, at least one of the accelerations of vibrations in each direction is greater than or equal to a first threshold set for each direction and less than or equal to a second threshold (first threshold <second threshold If the threshold value is less than the first threshold value, the print control mode is changed to the normal print mode after the automatic nozzle cleaning is performed. And a procedure for restarting the printing operation.
In such a procedure, for example, an in-vehicle printer main body is equipped with an acceleration sensor that measures vibration acceleration in the front-rear direction, the left-right direction, and the up-down direction, and the acceleration of vibration in each direction is measured. When at least one value of the vibrations is greater than or equal to the first threshold value and less than or equal to the second threshold value, printing is not performed as the idle mode. When the acceleration of vibration becomes equal to or less than the first threshold, the printer restarts the printing operation again after executing automatic nozzle cleaning.
As a result, when the vibration is of a certain magnitude, the carriage continues to scan even if ink ejection is stopped. Therefore, when the vibration is stopped, the printing operation can be resumed immediately after the head cleaning is completed.

The on-vehicle printer control method of the present invention includes a procedure for stopping a printing operation when at least one of accelerations of vibrations in each direction is equal to or greater than a second threshold value.
With such a method, for example, when at least one value among vibration accelerations in the front-rear direction, the left-right direction, and the up-down direction becomes equal to or greater than the second threshold value, for example, the motor input line is short-circuited. Etc. to stop the printing operation.
As a result, the driving body such as the carriage is firmly held at the stop position, thereby preventing damage due to collision with the casing.

The on-vehicle printer control method of the present invention includes a procedure for changing the values of the first threshold value and the second threshold value corresponding to each acceleration sensor according to the support direction of the printer.
With such a procedure, the values of “first threshold value and second threshold value” corresponding to each acceleration sensor are changed according to the support direction (mounting direction) of the printer in the vehicle.
Thereby, even if the usage (support method) of the printer is changed, the print mode can be appropriately controlled with respect to the acceleration of vibration in each direction.

In the on-board printer control method of the present invention, the on-board printer is installed so that the ink ejection direction is the front-rear direction of the vehicle, and the first threshold value and the second threshold value corresponding to the acceleration of the vibration in the front-rear direction are set. It includes a procedure for setting lower than the other directions.
In such a procedure, the in-vehicle printer is installed so that the ink discharge direction is the front-rear direction of the vehicle, and the “first threshold and second threshold” in the front-rear direction of the vehicle are set smaller than the other directions. To do.
As a result, even when the printer is used upright, it is possible to appropriately control the print mode with respect to the acceleration of vibration in each direction.

The in-vehicle printer of the present invention is an in-vehicle printer that is used by being mounted on a vehicle, and includes means for measuring acceleration of vibration in one or more directions acting on the printer body, and each of the measured directions. Means for switching a print control mode according to the magnitude of vibration acceleration.
In such a configuration, the in-vehicle printer body is equipped with, for example, an acceleration sensor that measures vibration acceleration in the front-rear direction, the left-right direction, and the up-down direction, measures the acceleration of vibration in each direction, and measures each direction The print control mode of the printer is switched according to the magnitude of the influence of the vibration on the in-vehicle printer.
As a result, it is possible to provide an in-vehicle printer that is highly reliable and capable of efficient printing by appropriately considering the difference in the degree of influence in each direction with respect to vibration exerted on the in-vehicle printer. For example, by setting the threshold value in the direction strong against vibrations (threshold value for changing the print control mode) to be high, the frequency of stopping the printing operation can be reduced, and the threshold value in the direction in which the printers are weak against vibrations is set. By setting the value low, the printing operation can be performed without impairing the printing quality.

In the in-vehicle printer of the present invention, at least one of the accelerations of vibrations in each direction is greater than or equal to a first threshold value set for each direction and less than or equal to a second threshold value (first threshold value <second threshold value). If it is, the print control mode is set to the empty mode in which ink is not ejected, and when it falls below the first threshold value, the nozzle is automatically cleaned and then returned to the normal print mode to perform the printing operation. It is characterized by comprising means for resuming.
In such a configuration, the in-vehicle printer body is equipped with, for example, an acceleration sensor that measures vibration acceleration in the front-rear direction, the left-right direction, and the up-down direction, measures the acceleration of vibration in each direction, and measures each direction When at least one value of the vibrations is greater than or equal to the first threshold value and less than or equal to the second threshold value, printing is not performed as the idle mode. When the acceleration of vibration becomes equal to or less than the first threshold, the printer restarts the printing operation again after executing automatic nozzle cleaning.
As a result, when the vibration is of a certain magnitude, the carriage continues to scan even if ink ejection is stopped. Therefore, when the vibration is stopped, the printing operation can be resumed immediately after the head cleaning is completed.

The in-vehicle printer according to the present invention is characterized by comprising means for stopping the printing operation when at least one of the accelerations of vibrations in the respective directions is equal to or greater than a second threshold value.
With such a configuration, for example, when at least one value among accelerations of vibrations in the front-rear direction, the left-right direction, and the up-down direction is equal to or greater than the second threshold value, for example, the motor input line is short-circuited. Etc. to stop the printing operation.
As a result, the driving body such as the carriage is firmly held at the stop position, thereby preventing damage due to collision with the casing.

The in-vehicle printer of the present invention is characterized by comprising means for changing the values of the first threshold value and the second threshold value corresponding to each acceleration sensor according to the support direction of the printer.
With such a configuration, the values of the “first threshold value and second threshold value” corresponding to each acceleration sensor are automatically changed according to the support direction (mounting direction) of the printer in the vehicle.
Thereby, even if the usage (support method) of the printer is changed, the print mode can be appropriately controlled with respect to the acceleration of vibration in each direction.

In the in-vehicle printer of the present invention, the in-vehicle printer is installed so that the ink ejection direction is the front-rear direction of the vehicle, and the first threshold value and the second threshold value corresponding to the acceleration of the vibration in the front-rear direction are set in other directions. It is characterized by comprising means for setting lower.
With such a configuration, the in-vehicle printer is installed so that the ink ejection direction is the front-rear direction of the vehicle, and the “first threshold value and second threshold value” in the front-rear direction of the vehicle are set smaller than other directions. To do.
As a result, even when the printer is used upright, it is possible to appropriately control the print mode with respect to vibration acceleration.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an in-vehicle printer of the present invention, where (a) is a top view, (b) is a front view, and (c) is a perspective view from the side. The in-vehicle printer of the present invention includes a carriage 3, a paper feed port 4, a paper feed roller 5, a paper discharge roller 6, a paper discharge port 7, which are provided with a nozzle head portion 1 and reciprocate along a carriage scanning axis 2, and a printer main body. It consists of acceleration sensors 8a, 8b, 8c provided to measure the acceleration in three directions acting on itself. The carriage 3 is scanned by a motor via a timing belt or the like. Further, a piezo element is used as the ink discharge means.

  This in-vehicle printer is normally used in a state where the nozzle head portion 1 is directed downward (toward the ground surface), so that the acceleration sensor 8a is the front-rear direction of the vehicle, the acceleration sensor 8b is the left-right direction, and the acceleration sensor 8c. Detects the acceleration of vibration acting in the vertical direction.

Here, the vibration characteristics in the forward / backward direction (front and rear) of the vehicle, the lateral direction (left and right) of the vehicle, and the vertical direction (up and down) are shown in the vertical direction. In the order. The vertical vibration is approximately 5 m / S ² or less during normal traveling, and may exceed 10 m / S ² when traveling at a high speed on a rough road surface or overcoming a step.

  On the other hand, in each direction of the printer, the main influence of vibration is the carriage main scanning direction and the ink ejection direction (the vertical direction of the vehicle), and the sub-scanning direction is relatively less susceptible to vibration. When the printer is used with the main scanning direction of the carriage 3 aligned with the left-right direction of the vehicle and the ink discharge direction aligned with the vertical direction of the vehicle, as described above, the acceleration sensor 8a is the front-rear direction, the acceleration sensor 8b is the left-right direction, and the acceleration sensor 8c. Will measure the vibration component in the vertical direction.

  In this case, since the threshold value of the acceleration sensor 8b and the vertical direction with the largest vehicle vibration are the ink ejection direction, the threshold value of the acceleration sensor 8c is set low.

An example of the setting value of the 1st threshold value and the 2nd threshold value in each acceleration sensor is shown.
“Acceleration sensor (front / rear) 8a—first threshold: 10 m / S ² , second threshold: 30 m / S ² ”, “Acceleration sensor (left / right) 8b—first threshold: 5 m / S ² , second Threshold value: 30 m / S ² ”,“ Acceleration sensor (up / down) 8 c −first threshold value: 5 m / S ² , second threshold value: 30 m / S ² ”.

  Here, the first threshold value is set to a lower limit value of vibration that may cause the impact of vibrations and cannot guarantee the landing accuracy of ejected ink, or that may cause bubbles to enter from the nozzle opening and cause missing dots. . As described above, the frequency at which the printing operation is stopped can be lowered by setting the threshold value in the direction in which the printer is strong against vibration (acceleration sensor 8a, vehicle front-rear direction) to be high. On the other hand, by setting the threshold value in the direction in which the printer is weak against vibration (acceleration sensor 8b, left-right direction, and acceleration sensor 8c, up-down direction), a printing operation can be performed without impairing the printing quality.

  In addition, the lower threshold value of the second threshold is a lower limit value of vibration that may cause damage to the nozzle head unit 1 when it collides with an opposing object or when the carriage crosses the stopper and collides with the housing. It is set.

FIG. 2 is a diagram for explaining the operation of the in-vehicle printer of the present invention. Hereinafter, the print mode control of the in-vehicle printer of the present invention will be described with reference to FIG.
Until the printer starts the printing operation and ends, the encoder pulse that is always the position information of the carriage 3 is measured (step S11). At the same time, accelerations of vibrations in three directions are measured by the acceleration sensors 8a, 8b, and 8c in a time period shorter than one pulse of the encoder (encoder of the carriage motor (see FIG. 5)) (step S12).

  The measurement value of the vibration acceleration measured in this way is compared with the first threshold as exemplified above (step S13). As a result of the comparison, if the vibration acceleration is less than the first threshold value, the stored value of the encoder pulse (number of pulses indicating the position from the reference point when vibration has occurred in the past and driving of the carriage 3 was stopped) (Step S14), if there is no stored value, the printing operation (ink ejection mode) is continued (step S17), and the stored value of the encoder pulse (regardless of the presence or absence) is reset ( Step S18), the print mode control process is repeated.

  On the other hand, in step S13, if any one of the vibration accelerations exceeds the first threshold value in each vibration direction, there is no stored encoder pulse value at the present time (step S19), so the encoder coder pulse is not stored. The measured value is stored (step S20).

  Next, the vibration acceleration is compared with the second darkness value (step S21). As a result, if the vibration acceleration is less than the second threshold value, the ink ejection mode (normal printing mode for performing the printing operation) is changed to the blanking mode. Change (step S22).

  The idle driving mode is a mode in which the paper feed is stopped and the carriage 3 continues scanning the same as in the ink discharge mode, and continues to give a slight vibration to the ink with such a strength that the ink is not discharged by the piezo element. It is possible to prevent the ink from drying out and solidifying in the nozzle, or air from flowing in from the nozzle opening to generate bubbles and prevent missing dots.

  Even after changing to the idle mode, the same measurement (steps S11 and S12) and comparison processing (step S13) are performed, but the vibration acceleration measured in the next time step is also greater than or equal to the first threshold value. Since the encoder pulse measurement value has already been stored, the encoder pulse storage process is not performed, the comparison with the second threshold value is performed (step S21), and the same process is repeated thereafter.

  On the other hand, as a result of repeating the same measurement (steps S11, S12) and comparison processing (steps S13, S19, S21), if the vibration acceleration is less than the first threshold (step S13), the encoder pulse is stored. The presence / absence of a value is determined (step S14), the head cleaning is automatically executed (step S15), the stored value of the encoder pulse is referenced (step S16), and the ink ejection mode is changed (step S17). Is restarted, the stored value of the encoder pulse is reset (step S18), and thereafter the same print mode control process is repeated.

  By such processing, the printing operation can be resumed from the moment when the vibration acceleration returns below the first threshold and the carriage position reaches the position changed to the idle driving mode. In addition, since the printing operation can be easily resumed even when vibration acceleration around the first threshold is intermittently applied, an efficient printing operation can be realized.

  On the other hand, if the vibration acceleration is equal to or greater than the second darkness value, the carriage and paper feed motor input lines (drive input lines) are short-circuited (step S23), and the carriage and paper positions are held. By such processing, it is possible to prevent the nozzle head unit 1 and the carriage 3 from being damaged due to a collision with a housing or the like.

  Even after the motor is short-circuited, the same measurement (steps S11 and S12) and comparison processing (steps S13 and S19) are performed, but the vibration acceleration measured in the next time step is also greater than or equal to the first threshold value. Since the encoder pulse measurement value has already been stored, the encoder pulse storage process is not performed, the comparison with the second threshold value is performed (step S21), and the same process is repeated thereafter.

  On the other hand, as a result of repeating the same measurement (steps S11, S12) and comparison processing (steps S13, S19, S21), when the vibration acceleration becomes less than the second threshold value, the short circuit of the motor is canceled and the empty The hit mode is changed (step S22). Further, when the vibration acceleration is less than the first threshold (step S13), the presence / absence of the stored value of the encoder pulse is determined (step S14), the head cleaning is automatically executed (step S15), and the encoder pulse is detected. (Step S16), the ink ejection mode is changed (step S17), the printing operation is restarted, the encoder pulse storage value is reset (step S18), and the same print mode control processing is performed thereafter. repeat.

  In this way, by executing the print mode switching control according to the durability of the vibration in each direction of the printer, it is possible to prevent the print operation from being stopped unnecessarily. It is possible to prevent the dot from being lost due to solidification or air flowing in from the nozzle opening and generating bubbles.

  In the example described above, the acceleration of vibration is an example of an in-vehicle printer that measures the three directions of “front-rear direction”, “left-right direction”, and “up-down direction” of the vehicle. Alternatively, only the “vertical direction” that is most susceptible to vibration may be measured.

By the way, the on-vehicle printer shown in FIG. 1 is an example in which the main scanning direction of the carriage 3 is used in the left-right direction of the vehicle and the ink discharge direction is matched with the up-down direction of the vehicle.
However, the in-vehicle printer of the present invention is not limited to this. For example, as shown in FIG. 3 showing an example in which the in-vehicle printer is installed on the front dashboard portion, a holder is provided between the dashboard 201 and the steering 202. 203 and the holder fixing unit 204, when the in-vehicle printer 100 is installed upright (the paper feed port faces up), that is, the main scanning direction of the carriage 3 is the left-right direction of the vehicle, and the ink discharge direction is the front-rear direction of the vehicle. It can also be used.

  Further, as shown in FIG. 4 showing an example in which an in-vehicle printer is installed beside the front sheet, a fixing member 301 and a holder 302 are provided beside the front sheet 300, and the in-vehicle printer 100 is installed upright (the paper feed port is up). In other words, the carriage 3 can be used so that the main scanning direction of the carriage 3 is the left-right direction of the vehicle and the ink discharge direction is the backward direction of the vehicle.

  As described above, when the in-vehicle printer is used upright, the threshold value of the acceleration sensor (front-rear direction) 8a and the acceleration sensor (up-down direction) 8c is automatically switched when the changeover switch 9 is pushed. The print mode control similar to that shown in FIG. With such a configuration, the printer's vibration characteristics can be fully taken into consideration regardless of the location of the printer (dashboard, on the seat, seat back, etc.), so stable print quality And printing efficiency, and can be prevented from damage.

  For the determination of the mounting direction (mainly the ink ejection direction) of this in-vehicle printer, a gravity sensor or the like is provided, the mounting direction is automatically determined based on these sensor signals, and the threshold value is automatically set. Also good.

FIG. 5 is a block diagram showing a configuration example of the control circuit of the in-vehicle printer according to the present invention, and shows a portion directly related to the present invention.
In FIG. 5, the threshold value changing unit 111 in the control circuit unit 101 of the in-vehicle printer 100 detects that the changeover switch 9 has been pressed, and performs a process of switching the vertical direction threshold value and the front-rear direction threshold value. This is because, for example, when the in-vehicle printer 100 is used upright, the threshold value of the acceleration of vibration is appropriately set in accordance with the main scanning direction of the carriage 3 being the left-right direction of the vehicle and the ink ejection direction being the front-rear direction of the vehicle. Used to set.

  Further, the print mode control unit 112 sets the printer to one of “normal print mode (ink ejection mode)”, “empty mode”, and “print stop mode” according to the measurement values of the acceleration sensors 8a, 8b, and 8c. Control to become. The paper feed control unit 113 gives an instruction to the paper feed motor control unit 141 to control the drive of the paper feed motor 151. The carriage control unit 114 gives an instruction to the carriage motor control unit 143 to control the carriage motor 152 to control the carriage 3 feed and stop. The head control unit 115 controls ink ejection from the nozzle head unit 1 of the print head.

  Further, in the storage unit 120, “first and second threshold values of acceleration of vibration in the front-rear direction”, “first threshold value and second threshold value of acceleration of vibration in the left-right direction”, “vertical direction "First threshold value and second threshold value" of acceleration of vibration, and "encoder pulse storage value" are recorded.

  The front-rear direction threshold value determination unit 131 receives the acceleration signal from the acceleration sensor (front-rear direction) 8 a, and the magnitude of the acceleration signal is stored in the storage unit 120 as “acceleration of vibration acceleration in the front-rear direction. The first and second threshold values are compared, and the comparison result is output to the print mode control unit 112.

  The threshold determination unit 132 in the left / right direction receives the acceleration signal from the acceleration sensor (left / right direction) 8b, and the magnitude of the acceleration signal is stored in the storage unit 120 as “first acceleration of left-right vibration”. The comparison result is output to the print mode control unit 112.

The vertical threshold determination unit 133 receives the acceleration signal from the acceleration sensor (vertical direction) 8c, and stores the magnitude of the acceleration signal in the storage unit 120 as “first vertical acceleration threshold”. The comparison result is output to the print mode control unit 112.
The print mode control unit 112 receives the comparison results from the front-rear direction threshold determination unit 131, the left-right direction threshold determination unit 132, and the up-down direction threshold determination unit 133, and performs the carriage 3, the nozzle head unit 1, and the like. The process shown in FIG. 2 is performed under control.

  The carriage motor 152 is equipped with an encoder 153, and encoder pulses generated by the rotation of the carriage motor 152 are counted by a pulse measuring unit (carriage position measuring unit) 142 and stored as position information of the carriage 3. . The “carriage position” is stored in the storage unit 120 as “encoder pulse storage value”.

  As described above, the embodiment of the present invention has been described. However, in the in-vehicle printer of the present invention, the frequency of stopping the printing operation can be lowered by setting the threshold value in the direction in which the printer is strong against vibration, so that the printer can be stopped. By setting the threshold value in the direction weak against vibration to a low value, the printing operation can be performed without impairing the printing quality.

In the case of an empty space, the carriage continues to scan even if ink ejection is stopped. Therefore, when the vibration is stopped, the printing operation can be resumed immediately after the head cleaning is completed. In the stop mode, the motor is short-circuited to hold the drive body firmly at the stop position, thereby preventing damage due to collision or the like. Furthermore, even if the usage (support method) of the printer is changed, the print mode control for each acceleration direction can be appropriately performed.
In addition, with the above operation, it is possible to provide an in-vehicle printer that has high printing efficiency and is easy to use while guaranteeing print quality.

  Although the embodiment of the present invention has been described above, the in-vehicle printer of the present invention is not limited to the above illustrated example, and various modifications can be made without departing from the gist of the present invention. Of course.

  In the in-vehicle printer of the present invention, it is possible to perform highly reliable and efficient printing by appropriately considering the difference in the degree of influence in each direction with respect to the vibration applied to the in-vehicle printer. Therefore, the present invention can be applied to an in-vehicle printer control method, an in-vehicle printer, and the like.

The schematic block diagram of the vehicle-mounted printer of this invention. The figure for demonstrating operation | movement of the vehicle-mounted printer of this invention. The figure which shows the example which installed the vehicle-mounted printer in the dashboard part of the front. The figure which shows the example which installed the vehicle-mounted printer beside a front seat. The block diagram which shows the structural example of the control circuit of the vehicle-mounted printer of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle head part, 2 Carriage scan axis | shaft, 3 Carriage, 4 Paper feed port 5 Paper feed roller, 6 Paper discharge roller, 7 Paper discharge port, 8a Acceleration sensor (front-back direction)
8b Acceleration sensor (horizontal direction), 8c Acceleration sensor (vertical direction)
9 Changeover switch

Claims (10)

A method for controlling an in-vehicle printer used in a vehicle,
A procedure for measuring the acceleration of vibration in one or more directions acting on the printer body;
And a procedure for switching a print control mode according to the measured magnitude of vibration acceleration in each direction. When at least one of vibration accelerations in each direction is not less than a first threshold value set for each direction and not more than a second threshold value (first threshold value <second threshold value), the print control mode Includes a procedure for returning to the normal printing mode and restarting the printing operation after performing automatic cleaning of the nozzle when the air discharge mode does not discharge ink and becomes the first threshold value or less. The method for controlling an in-vehicle printer according to claim 1. The method for controlling an in-vehicle printer according to claim 1, further comprising a step of stopping a printing operation when at least one of vibration accelerations in each direction is equal to or greater than a second threshold value. The in-vehicle printer according to any one of claims 1 to 3, further comprising a step of changing the values of the first threshold value and the second threshold value corresponding to each acceleration sensor in accordance with a support direction of the printer. Control method. Including installing a vehicle-mounted printer so that the ink discharge direction is the front-rear direction of the vehicle, and setting a first threshold value and a second threshold value corresponding to the acceleration of vibration in the front-rear direction lower than the other directions. The method for controlling an in-vehicle printer according to any one of claims 1 to 4. An in-vehicle printer used by being mounted on a vehicle,
Means for measuring acceleration of vibration in one or more directions acting on the printer body;
A vehicle-mounted printer comprising: means for switching a print control mode according to the measured magnitude of vibration acceleration in each direction. When at least one of vibration accelerations in each direction is not less than a first threshold value set for each direction and not more than a second threshold value (first threshold value <second threshold value), the print control mode Is a non-ejection mode in which ink is not ejected, and when it falls below the first threshold, after performing automatic cleaning of the nozzles, it is provided with means for returning to the normal printing mode and restarting the printing operation The in-vehicle printer according to claim 6. The vehicle-mounted printer according to claim 6 or 7, further comprising means for stopping a printing operation when at least one of the accelerations of vibrations in the respective directions is equal to or greater than a second threshold value. The vehicle-mounted printer according to any one of claims 6 to 8, further comprising means for changing the values of the first threshold value and the second threshold value corresponding to each acceleration sensor in accordance with a support direction of the printer. . The vehicle-mounted printer is installed so that the ink discharge direction is the front-rear direction of the vehicle, and includes means for setting the first threshold value and the second threshold value corresponding to the acceleration of the vibration in the front-rear direction lower than the other directions. The in-vehicle printer according to any one of claims 6 to 9, wherein

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