JPS6129272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to inkjet printers, impact dot printers, etc., which can print characters and characters by dot printing.
In particular, regarding recording devices that display figures, symbols, etc.
The present invention relates to a recording dot misalignment correction device.

An example configuration of this type of recording device is shown in FIG.
In this example, an ink-on-demand type ink ejecting head (recording head) 2 (Fig. 2) having seven nozzles and an ink tank 3 are installed in the carriage 1, and the main scanning mechanism scans the carriage 1 in the left and right direction. Ink droplets are ejected from the head 2, and the carriage 1 is scanned in the vertical direction by a sub-scanning mechanism for each main scanning line to form a desired record. Ink-on-demand type ink ejecting heads and inkjet printers using the same are already known (see, for example, Japanese Patent Laid-Open No. 55239/1983).

In the inkjet printer shown in FIG. 1, a carriage 1 is driven for main scanning by a motor 8 via an endless wire 4, a roller 5, a guide bar 6, and a wire 7 that constitute a main scanning mechanism.
Further, the sub-scanning mechanism is driven by a motor 11 via a holding frame 9 and a wire 10 that constitute a sub-scanning mechanism.
Note that the holding frame 9 is slidably guided by a guide bar 6, and the roller 5 is slidable on the guide bar 6 and is rotationally driven by the rotation of the guide bar 6. 12 is a recording paper mounting table, and 13 is a recording paper.

In the recording apparatus shown in FIG. 1, photo sensors 14 are installed at the start and end ends of the main scanning recording area, respectively, so that the recording operation is performed within a desired section of the main scanning (direction perpendicular to the guide bar 6). ₁ and 14
₂ is installed slidably (in the case of an embodiment in which the width of the main scanning recording area is adjustable) or fixedly (in the case of an embodiment in which the width of the main scanning recording area is fixed), and the inkjet recording head The arrival of the light shielding plate 15 (FIG. 2) fixed to the carriage 1 carrying the is detected. In FIG. 1, a photo sensor ₁₄₁ is provided as a start signal generating means.

In the recording apparatus shown in FIG. 1, a slit plate 16 is fixed to the guide bar 6, and an electric pulse is obtained from a photo sensor 17 in synchronization with the rotation of the slit plate 16. That is, the slit plate 16 and the photo sensor 17 constitute an encoder, which outputs pulses whose frequency changes according to the rotation of the guide bar 6. In this example, the slit plate 16 and photo sensor 17 are used as dot synchronization pulse generating means. One of the pulses generated by the photo sensor 17 indicates that the carriage 1 has moved dot by dot in the main scanning direction.

In the inkjet printer shown in FIG. 1, the inkjet recording head 2 (FIG. 2) mounted on the carriage ₁ has seven ink jet nozzles arranged in the sub-scanning direction, and the carriage During one main scan of moving to ₁₄₂ , printing of seven dot widths (vertical width of one line) in the sub-scanning direction, that is, printing of one line, is performed.

The contents of this one line record are as follows. That is, the recording operation is started when the output of the photo sensor ₁₄₁ changes from a low level to a high level (or vice versa) (printing start signal), and is synchronized with the output pulse of the photo sensor 17 (dot printing synchronization pulse). Then, each pulse produces 1 dot in the main scanning direction (7 dots simultaneously in the sub-scanning direction; however, more precisely, during the main scanning movement of 1 dot pitch, 7 dots are produced in the sub-scanning direction one by one, or There is also a mode of time-sharing recording by group division). That is, when the output of the photo sensor ₁₄₁ changes from a low level to a high level, a known recording head driver (not shown) drives the recording head based on the print data, timed with the dot print synchronization pulse. and perform inkjet recording.

A specific example has been shown above, but in addition to this, recording devices that display characters, figures, symbols, etc. by dot printing have recording paper wound around a platen or drum and arranged parallel to the platen axis. When a recording head is mounted on a carriage that has a 100mm recording head, and the carriage is driven one main scan to record one line or line, the platen is moved one line width (line width; not line length) or one line width (for example, character vertically). The recording head rotates (sub-scanning) by the length of the drum (hereinafter referred to as the recording head main scanning type), and the drum rotates continuously and the recording head is activated for recording (main scanning) during one drum rotation (main scanning). 1
line or one line), drive (sub-scan) the carriage by one line width (line width; not line length) or one line width (e.g. character vertical width), or
There is a type of recording head that is continuously driven by one line width or one line width during rotation (hereinafter referred to as a recording head sub-scanning type). The recording head main scanning type described above includes a start signal generating means similar to the photo sensor ₁₄₁ shown in FIG. 1, and a slit plate 1.
In many embodiments, a dot synchronization pulse generating means consisting of a photo sensor 6 and a photo sensor 17 is provided. In addition, in the sub-scanning type of recording head mentioned above, a pulse generator (start signal generating means) generates one drum synchronizing pulse (printing start signal) to the drum for one rotation of the drum.
In many cases, a rotary encoder (dot synchronization pulse generation means) coupled to the drum is also provided, which generates one pulse (dot printing synchronization pulse) every time the drum rotates corresponding to one dot recording pitch.

In both the recording device shown in FIG. 1 and the two types of recording devices mentioned above, after a printing start signal is generated, the recording head is timed with a dot printing synchronization pulse to perform printing based on the printing data. However, as the start signal generating means, there is an embodiment in which a carriage home position sensor and a counter that detect that the carriage is in a standby position (for example, a position immediately adjacent to the frame 9 in FIG. 1) are used. In this embodiment, the sensor outputs, for example, a low level signal when the carriage is in the home position, and a high level signal when the carriage moves from the home position toward the recording area and leaves the home position. When the output of the sensor changes from a low level to a high level, the counter starts counting up the dot printing synchronization pulse, and when the set number is counted, that is, the record for which the carriage has been set is reached. When reaching the starting end of the area, a printing start signal is generated. Instead of returning the carriage to the home position after each scan, when the first printing start signal is generated, clear the counter, set the up count, and start counting up again from there. When the value reaches the value equivalent to the end point of the main scan, the carriage is driven in reverse (return) and the counter is switched to down-count, the carriage is driven until the count value passes 0 and becomes a negative value, and then stopped. There is also a mode in which the main scanning drive is started, the counter is switched to up-counting, and when the count value reaches 0, a printing start signal is generated.

Furthermore, in both the recording device shown in FIG. 1 and the above two types of recording devices, a rotary encoder (16+17 in FIG. 1) generates a dot printing synchronization pulse mechanically linked to the carriage drive. There is also an embodiment in which an oscillation circuit is used to generate an electric pulse of a constant frequency, and this is frequency-divided and used as a dot printing synchronization pulse. In this embodiment, the pulse oscillation circuit is a dot synchronization pulse generating means, and the recording head is activated for recording at the timing of this dot imprint synchronization pulse, and the constant frequency electric pulse or dot imprint synchronization pulse of the oscillation circuit is activated. The main scanning drive motor is energized to rotate at a constant speed based on the pulse. For example, the main scanning drive motor is driven to rotate under PLL (phase locked loop) control so that the dot printing synchronization pulse and the pulse generated by motor rotation are synchronized. Alternatively, the main scanning drive motor is a pulse motor, and the pulse motor is rotationally energized in time with the dot printing synchronization pulse.

In this type of printing apparatus, the starting point of one scan printing may shift, resulting in dot misalignment between different scan printing lines or between lines. It has been found that the cause of this is a variation in the relative phase difference between the printing start signal and the dot printing synchronization pulse when starting one scan recording.

To explain this, when the print data indicates recording, the recording head installed in the carriage 1 will output 1 when the dot print synchronization pulse rises to a high level.
Assume that the dot recording energization is started, and now the printing start signal 1 is activated as shown by the solid line in FIG.
4 ₁ S (output of sensor 14 ₁ ) appears and the dot printing synchronization pulse (output of sensor 17) appears as shown in 17S-1 in the first row recording scan. The first dot record is P ₁
Starts at point. Assuming that the dot printing synchronizing pulse appears as shown in 17S-2 in the second line recording scan, the first dot recording of the second line starts at point _P2 , and in the third line recording scanning, the dot printing synchronizing pulse appears. If it appears as shown in 17S-3, then the third
The first dot recording of the row begins at point _P3 . In this case, the maximum difference between the start of each row of recording is te, which is smaller than one dot pitch (one cycle of dot printing synchronization pulse), so the dot shift between each row is extremely small and unnoticeable.

If the rising of the printing start signal to a high level (the starting point of the printing start signal) is delayed and shifts to the right in _FIG . Therefore, from the start of recording of the first and second rows, there is a deviation of approximately one dot pitch (one cycle of the printing dot synchronization pulse), and the generation of the printing start signal 14 ₁ S is further delayed, causing the signal to reach a high level. When the rising edge reaches the _P1 point, the pulse 17S-1 is activated in the first row.
Recording starts at the next rising point of point P ₁ (point delayed by one cycle), but the recording of the third row starts at point P ₃ , and the first and second rows (P ₂ ′) The discrepancy in the start of recording is
te, but start recording them and the third line (P ₃ )
The deviation is close to one dot pitch.

The generation of printing start signal 14 ₁ S is further delayed and P ₃
When the point is exceeded, the recording start point is P ₁ , as shown in Figure 4.
There will be ₃ points P ₂ and P, and the recording start deviation will be within te.

This phenomenon will be explained in more detail with reference to FIG. When the relationship between the rise of the printing start signal _141S and the dot printing synchronization pulse 17S (output of the sensor 17) is the timing relationship shown by the solid line in FIG. 7, recording starts from the printing synchronization pulse PS2. . This is because the pulse PS2 rises to a high level for the first time after the printing start signal 14 ₁ S rises. Even if the rise of printing start signal 14 ₁ S progresses (even if it shifts to the left in Figure 7)
Recording starts from pulse PS2 unless it advances beyond the rising point _t1 of pulse PS2. i.e. pulse
When there is a rising edge of signal 14 ₁ S from the rising point t ₁ of PS1 to the rising point t ₂ of pulse PS2, the pulse
Recording of one line starts from PS2. When the rising edge of the printing start signal 14 ₁ S is delayed and rises after the rising edge of the pulse PS2 (shifting to the right after the rising edge of 14 ₁ S in Fig. 7), the dot printing synchronizing pulse is generated for the first time after the rising edge of 14 ₁ S. Since 17S rises at point _t3 , recording of one line starts from pulse PS3. In other words, from the rising point _t2 of pulse PS1, the pulse
When the signal 14 ₁ S rises by the rising point t ₃ of PS2, recording of one line is started from pulse PS3. Will recording start from pulse PS2?
Printing start signal 1 determines whether recording starts from 3.
4 ₁ It depends on whether the rise of S is before or after 1 point t ₂ .

That is, roughly speaking, the dot printing synchronization pulse 17
When the printing start signal 14 ₁ S rises near the rising point of S, a slight deviation of at least one of the printing start signal 14 ₁ S and the dot printing synchronization pulse 17S causes the recording start point to be t ₂ or t. ₃ , resulting in a dot shift of nearly one dot pitch between recorded lines. Referring to FIG. 1, when the frame body 9 vibrates, the sensor ₁₄₁ vibrates, and the rise of the printing start signal _141S may vary from scan to record line to scan line. The rising timing of the printing start signal 14 ₁ S may also vary due to vibrations and vibrations of the carriage 3. Furthermore, the above description also applies to the printing start signal 14.
_1S has been explained, but a similar dot shift also occurs due to a phase shift in the dot printing synchronization pulse 17S. Also, in the rotary encoder consisting of the slit plate 16 and the photo sensor 17, the phase of the generated pulse, that is, the dot printing synchronization pulse 17S, varies due to the vibration of the slit plate 16, the dimensional error of the transparent slit, the vibration of the photo sensor 17, etc. .

Similar dot misalignment can occur even in a mode in which the recording head starts recording at the falling point of the dot printing synchronization pulse 17S. As shown in FIG. 7, the dot shift at the recording start point close to one dot pitch as described above is caused by the rising timing of the printing start signal 14 ₁ S and the rising timing of the dot printing synchronizing pulse (recording at the falling point). In the starting mode, the fall timing) is very close to each other, and this tends to occur when the phase of at least one of the printing start signal and the dot printing synchronizing pulse varies even slightly for each scan recording.

When considering a method to prevent such a recording start deviation close to one dot pitch, as explained earlier, when the rising edge of the printing start signal 14 ₁ S is located between t ₁ and t ₂ , t ₂ When the rising edge of 14 ₁ S is located between t ₂ and t ₃ , the recording starts from point t ₃ , and since t ₂ is the division point, roughly speaking, t ₁ and t sensor 1 so that the rising edge of 14 ₁ S is between t ₂ and t ₃ , or between t ₂ and t 3.
It has been found that it is sufficient to perform the following steps: _4.1 positioning, setting the attachment angle of the slit plate 16 to the guide bar 6, and/or positioning the sensor 17. In this way, for example, if the time between _t1 and _t2 (dot printing synchronization pulse period) is T, then the rising edge of the printing start signal _141S and the dot printing synchronization pulse 17S
Even if the rising edge of the printing synchronization pulse 17S deviates within a relative range of less than T/2, the deviation in the start of recording will be much smaller than one dot pitch (for example, te), and this deviation is due to the deviation of the printing synchronization pulse 17S. (te), and the probability of causing a large recording start shift close to one dot pitch is the lowest. By the way, if the rising edge of 14 ₁ S is set close to point t ₂ , the recording start point will shift to t ₂ or t ₃ with a very slight phase shift of 14 ₁ S and/or 17 S, so it will be close to 1 dot pitch. , the probability of causing a large recording start shift becomes extremely high.

Therefore, in the design or when assembling the recording device,
Roughly, between t ₁ and t ₂ , or between t ₂ and t ₃ , 1
The sensor 14 ₁ may be positioned, the mounting angle of the slit plate 16 relative to the guide bar 6 may be set, and/or the sensor 17 may be positioned so that the rising edge of 4 ₁ S occurs.

However, the dot recording pitch in this type of recording device is extremely small, such as 1/4 to 1/8 mm or 1/16 mm (this value corresponds to T), so the mechanical setting described above is easy. Not. Also,
Even if the settings are set accurately, mechanical deviations of about these values (the problem is half the value:
(corresponding to the above-mentioned T/2), but it is not easy to mechanically reset the timing to correct it, that is, adjust the timing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dot misalignment correcting device that can reduce dot misalignment at the scan recording start end near one dot pitch as described above, and allows relatively easy dot misalignment adjustment.

In order to achieve the above object, the present invention:
As mentioned above, the start signal generating means generates a printing start signal at the recording start position in one scanning recording length of the recording head; and the scanning of the dot recording pitch in the scanning recording direction during scanning driving of the recording head. A recording apparatus comprising a dot synchronization pulse generating means for generating a dot imprint synchronization pulse synchronized with the dot progression, and starts recording in one scan in synchronization with the dot imprint synchronization pulse after a printing start signal is generated: The apparatus includes adjustable delay means whose delay time is adjustable and which delays at least one of the printing start signal and the dot printing synchronization pulse to set the relative phase of the printing start signal and the dot printing synchronization pulse.

If _the adjustable delay _means is provided in this way, for example in the example shown in _{FIG .} , 14 _1Sensor 1 so that the rising edge of S occurs.
_4. Adjusting the delay time of the adjustable delay means without mechanically setting or adjusting the positioning of the slit plate 16, the mounting angle of the slit plate 16 with respect to the guide bar 6, and/or the positioning of the sensor 17,
Relatively, the rising point of the printing start signal 14 ₁ S and the rising point of the dot printing synchronizing pulse are set between t ₁ and t ₂ or between _{t 2} and t ₃ . You can adjust it to suit your needs. For example, if no recording start shift appears when recording is performed without adjustment, it may be left as is without adjustment. If a start shift occurs between recordings, the delay time of the adjustable delay means may be reset to a value T/2 longer or shorter than the current value. When using an adjustable delay means that makes it difficult to check T/2, operate the delay time setter of the adjustable delay means while recording to sequentially lengthen or shorten the delay time and record. You can stop the operation when the start deviation disappears,
Also, check the setter position or delay time setting value of the two points where the recording start deviation occurs most frequently (for example, corresponding to t ₁ and t ₂ ) by actually recording, and set the setter or delay time at the midpoint between the two points. Just set the value. The same applies to adjustment of the recording start deviation after the recording device is handed over to the user.

In addition, in order to facilitate adjustment by the user, adjust the adjustable delay means while recording, search for the delay time that causes the most recording start deviation, and calculate the value obtained by adding T/2 to the delay time. Or, it is better to set the value obtained by subtracting T/2 from the delay time as the delay time reference value, and add T/2 to the recording device (display it on the adjustable delay means section or write it in the manual, etc.) . In this case, if the recording start lag occurs, the value obtained by adding T/2 to the currently set delay time, or subtracting T/2 from the delay time,
What is necessary is to update the delay time of the adjustable delay means.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

FIG. 5 shows an embodiment of the present invention. This embodiment is used in the inkjet printer shown in FIG. 1, and an adjustable delay circuit 18 delays the printing start signal _{14 1 S} generated by the photo sensor 141. The adjustable delay circuit 18 is composed of an adjustable mono multivibrator VMM and an AND gate AND2. Photo sensor 14 ₁ ,
The outputs of ₁₄₂ and 17 are pulse-shaped through a waveform shaping circuit, and a printing start signal 14 ₁ S, an end signal 14 ₂ S and a dot printing synchronizing pulse 17S are obtained from the waveform shaping circuit.

The mono-multivibrator MM to which the dot printing synchronization pulse 17S is given is designed to make the pulse width of the dot printing synchronization pulse 17S even shorter than the output pulse width of the photo sensor 17 to reduce dot misalignment at the start of printing. It was established in

FIG. 6 shows signals of various parts of the electric circuit shown in FIG. 5. To explain with reference to FIG. 6, the printing start signal 14 ₁ S and end signal 14 ₂ S are input to the AND gate AND1.
provides a high level output AND1S to the adjustable delay circuit 18 while the carriage 1 is in the recording area. The mono multivibrator VMM of the adjustable delay circuit 18 is triggered when its input rises from a low level to a high level (when the printing start signal 14 ₁ S rises), and its output VMMS changes to a high level. Switch from low level to variable resistor VR
After a delay time Mt determined by the slider setting position, the output VMM is returned from the low level to the high level.
Since the input and output of the mono multivibrator VMM are given to the AND gate AND2, the output AND2S of the AND gate AND2 becomes high level after a delay time Mt from the rise of the printing start signal 14 ₁ S, and the end signal 14 ₂ Returns to low level when S falls. Output of AND gate AND2
AND2S and mono multivibrator MM output
Since MMS is given to the AND gate AND3,
The output AND3S of the AND gate AND3 is the output of the mono multivibrator MM during the time interval from when the printing start signal 14 ₁ S rises until the end signal 14 ₂ S falls after the delay time Mt has elapsed. Outputs MMS (shortened dot printing synchronization pulse).

A recording head driver (not shown) receives the output AND3S of the AND gate AND3 as a dot printing synchronization pulse, and performs dot recording based on this pulse.

The relationship between the scanning movement of the carriage 1 and the start of recording will be explained with reference to FIGS. 1, 5, and 6.
When the carriage 1 is driven in the main scanning direction from the left end position shown in FIG. 1 to the right, the output 14 ₁ S of the photo sensor 14 ₁ changes from a low level to a high level (conventional printing start signal generation). Photo sensor 14 ₂
Since is in the light receiving state, its output 14 ₂ S is at a high level, so the output AND1S of the AND gate AND1 changes in level in synchronization with the printing start signal 14 ₁ S and becomes high level. The rise of this high level triggers the mono multivibrator VMM, and the output VMMS becomes a low level for a time Mt determined by the slider position of the variable resistor VR, and this output VMMS and the output AND1 of the AND gate AND1.
Output AND of AND gate AND2 with S as input
2S is the printing start signal 14 ₁ S of the sensor 14 ₁ S.
It changes to a high level after Mt time from the rise of .
This caused a delay of Mt in the printing start signal.
AND2S is obtained. The AND gate AND3 is supplied with this printing start signal AND2S and the dot printing synchronization pulse MMS, which has a short pulse width with the mono multivibrator MM.
₁ output 14 After a delay time of Mt has elapsed from the rise of ₁ S, the dot printing synchronizing pulse AND3S
is given, and based on this pulse, the recording head driver moves the main scanning direction 1 at the rising point of the pulse.
Start recording dots.

Delay time Mt is mono multivibrator VMM
The delay time Mt can be continuously adjusted by adjusting the variable resistor VR, so when the start of each line recording has a relatively large deviation of about 1 dot, the operator can adjust the delay time Mt with the slider of the variable resistor VR. It can be adjusted so that no deviation occurs. That is, if a relatively large deviation of nearly one dot occurs in the start of each row recording, the slider of the variable resistor VR is moved to lengthen (or shorten) the delay time. If you do this continuously, in the recorded image, the 1
The appearance frequency of relatively large dots near the dot gradually decreases, and even if such a shift no longer occurs, if the delay time is further increased, the appearance frequency gradually increases again, and the appearance frequency becomes approximately a sign with respect to the slider position. It rises and falls in a wavy manner. For example _, when the printing start signal (the rising edge of _AND2S ) is t ₂ as _shown in _FIG . Become. Therefore, the slider position is set so that the printing start signal (rising edge of AND2S) shifts to the position where the appearance frequency is lowest, for example, the midpoint between t ₁ and t ₂ or the midpoint between t ₂ and t ₃ . stipulate. If the amount of slider movement corresponding to the time T/2 described above is already known, when a relatively large shift of nearly one dot appears at the start of recording each line, move the slider accordingly.
It is only necessary to move the delay time Mt in the direction of lengthening or shortening by the amount of movement equivalent to T/2. Therefore, it is preferable to attach an adjustment scale to the knob of the slider, and set this scale to have a movement amount corresponding to T/2 as the minimum unit. In this way, when a relatively large deviation of nearly one dot appears at the start of each line recording, it is sufficient to move the slider by one scale in the direction of lengthening or shortening the delay time Mt.

In the above embodiment, the adjustable delay means 18 is connected to the printing start signal line to adjustably delay the printing start signal. The reason why a relatively large shift of nearly 1 dot appears in
Because of variations in the relative phase difference between the printing start signal and the dot printing synchronization pulse, the same effect as in the above-described embodiment can be obtained even if the dot printing synchronization pulse is adjustable and delayed. That is, the adjustable delay means may be connected to the signal line of the dot printing synchronization pulse. In this case, the entire dot printing synchronization pulse is delayed, so the
Delay means for shifting signals based on clock pulses (in this case, the number of shift stages is adjustable)
Digital clock pulse count-up is started when the dot printing synchronization pulse arrives, and when the count value reaches the set value, an output pulse is generated, such as a count circuit, and the set value is adjustable. Delay means may be used. In this case, the count-up time (set value) becomes the delay time.

As described above, according to the present invention, when a relatively large recording deviation of nearly one dot occurs at the start of recording in each row (or each line) in the main scanning direction, the correction adjustment is extremely simple, and the adjustment scale is also easy. can be attached to

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a general configuration of an example of a recording device to which the present invention is applied. FIG. 2 is an enlarged side view of a portion of the carriage 1 shown in FIG. 1. FIGS. 3 and 4 are time charts showing the relationship between the printing start signal 14 ₁ S of the recording apparatus and the dot printing synchronization pulse (17S-1, etc.). FIG. 5 is an electrical circuit diagram showing the configuration of an embodiment of the present invention. FIG. 6 is a time chart showing signals of various parts of the electric circuit shown in FIG. 7th
The figure is a time chart showing the signals shown in FIGS. 3 and 4 with the time axis enlarged. 1... Carriage, 2... Ink ejection head, 3...
Ink tank, 4, 7, 10... Wire, 5... Roller, 6... Guide bar, 8, 11... Motor, 9... Holding frame, 12... Recording paper mounting table, 13... Recording paper, 14
₁ ...Photo sensor (start signal generation means), 1
4 ₂ ... Photo sensor, 15... Light shielding plate, 16... Slit plate, 17... Photo sensor (dot printing synchronization pulse generating means), 18... Adjustable delay circuit (adjustable delay means).

Claims (1)

[Scope of Claims] 1. Start signal generating means for generating a printing start signal at a printing start position in one scanning printing length of the printing head; and, during scanning driving of the printing head, dot printing in the scanning printing direction. Dot synchronization pulse generating means for generating a dot printing synchronization pulse in synchronization with the scanning progress of the pitch, and recording in one scan is started in synchronization with the dot printing synchronization pulse after the printing start signal is generated. A dot misalignment correction device used in the apparatus, wherein the delay time is adjustable, and at least one of the printing start signal and the dot printing synchronization pulse is delayed to adjust the relative relationship between the printing start signal and the dot printing synchronization pulse. A dot misalignment correction device for a recording device, characterized by comprising an adjustable delay means for setting a phase.