JP3455835B2 - Serial printer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial printer, and more particularly to a gap position adjusting device between a print head and a platen.

[0002]

2. Description of the Related Art Some serial printers are provided with a mechanism capable of automatically adjusting a gap between a print head and a platen. This platen gap adjustment mechanism is provided with a mechanism that moves the platen toward and away from the carriage, and a sensor that detects that the platen is in contact with the protector on the print head side or the medium, and the platen is attached to the medium. After detecting the contact, the platen is moved by a predetermined amount in the direction of separating the platen, so that a desired gap can be formed.

[0003]

In a serial printer provided with a platen gap adjusting mechanism, if the parallelism between the platen side and the print head side is incorrect, a desired gap can be formed at one place on the platen. However, there is a problem that the desired gap cannot be obtained because the gap changes as the print head moves.

[0004]

To solve the problems described above SUMMARY OF THE INVENTION The present invention provides a Shiruaru printer having a gap adjusting means for adjusting a gap formed between the platen and the print head, the gap adjustment direction Against
One of the print head side and platen side is movable, the other is fixed
When the movable side and the fixed side are in contact with each other,
The contacts provided on each of the fixed sides come into contact with each other for electrical conduction.
Detecting contact between the movable side and the fixed side by obtaining communication
The contact detection means is activated after the movable side and the fixed side are in contact with each other.
Pressure to detect contact between movable side and fixed side due to generated pressure
And a plurality of detection points on the platen provided with force detection means.
With the use of the contact detection means and the pressure detection means
Distance from the initial position on the movable side to the contact position on the fixed side
When each contact is detected by detecting the separation
The distance detected by the
The difference between the measured distance and
Obtained as the deflection correction amount that occurs when contact is detected,
At the time of initial operation, the pressure detection hand is
Connection of the movable side from the initial position to the fixed side by using a step
Each distance to the touch is detected and
The value obtained by subtracting the value of the deflection correction amount from the value of the detection distance
Originally, the inclination of the movable side with respect to the fixed side and its direction
Orientation, and based on the result of the identification, mark the platen
To correct the gap formed between the
Characterize.

[0005]

1 is a control block diagram showing an example of an embodiment of a serial printer of the present invention, and FIG. 2 is a side view showing a platen up / down mechanism mounted on the serial printer of the present embodiment. First, the structure of the platen up / down mechanism will be described with reference to FIG.

In the figure, 11 is an up / down (hereinafter referred to as U / D) motor, and a motor gear 12 and a slit disk 13 are fixed to the shaft of this U / D motor 11. Reference numeral 14 denotes a rack to which the platen 2 is attached. The rack 14 supports the platen 2 so that the platen 2 can move toward and away from the print head 1 and can move in the vertical direction. A rack gear portion 14a extending along is provided. The racks 14 are attached to both ends of the platen 2 in the extending direction.

Reference numeral 15a denotes a motor gear 1 of the U / D motor 11.
2 is a large gear that meshes with 2; 15b is a small gear that is coaxial with this large gear 15a; 15c is a large gear that meshes with this small gear 15b; 15d is a small gear that is coaxial with this large gear and that meshes with the rack gear portion 14a of the rack 14; The driving force generated by the U / D motor 11 is transmitted to the rack 14 by these gear groups, and the rotational movement of the U / D motor 11 is converted into the vertical movement of the rack 14. The rack 14 is the platen 2
Since they are attached to both ends of the gear 15c, 1g in order to transmit the driving force to the other rack 14,
A shaft extends from 5d along the platen 2, and a small gear is attached to the shaft so that the gear is attached to the rack 14
Is engaged with the rack gear portion 14a. This allows
The driving force is simultaneously transmitted to the racks 14 on both the left and right sides, and the platen 2 can be moved up and down while maintaining the parallel state.

Reference numeral 16 is a photosensor for detecting the rotation amount of the slit disk 13,
3 is provided with a plurality of slits along the circumferential direction, and the U / D motor 1 is provided by detecting the slits with the photosensor 16 and counting the number of the slits.
The rotation amount of 1 can be recognized, whereby the position of the platen 2 that moves up and down by rotating the U / D motor 11 can be managed.

Reference numeral 17 is a pressure detecting sensor, and when the platen 2 is raised and the platen 2 or a medium (not shown) comes into contact with the lower surface of the ribbon protector bracket 3, the pressure detecting sensor 17 is actuated by the pressing force, and the ribbon protector is activated. The contact between the bracket 3 and the platen 2 or a medium (not shown) is detected. Reference numeral 6 denotes a contact detection circuit, which detects the contact between the platen 2 and the ribbon protector bracket 3 by electrical conduction. For this reason, the platen 2 is provided with a contact 6a electrically isolated from other parts by the insulating material 5, and a contact not shown is provided at a position facing the contact 6a of the ribbon protector bracket 3. , The platen 2 is raised to approach the ribbon protector bracket 3, and when both contacts come into contact and electrical conduction is obtained, the contact detection circuit 6 detects the contact between the platen 2 and the ribbon protector bracket 3. Has become.

The position detected by the pressure detection sensor 17 and the position detected by the contact of the contact detection circuit 6 should be as close as possible to reduce the error. Next, the operation of the up / down mechanism of the platen 2 having the above configuration will be described. As an initial operation of the auto gap type printer, an operation for storing the distance from the initial position of the platen 2 to the ribbon protector bracket 3 as basic data for the subsequent medium thickness measurement is performed.

That is, by sending a forward signal to the U / D motor 11, the U / D motor 11 is rotated in a predetermined direction, and the platen 2 in the initial position is moved in the ribbon protector bracket 3 direction. When the forward signal is continuously sent to the U / D motor 11, the space between the platen 2 and the ribbon protector bracket 3 becomes narrower, and finally the platen 2 and the ribbon protector bracket 3 come into contact with each other. The contact between the platen 2 and the ribbon protector bracket 3 is detected by the pressure detection sensor 17, and the rotation of the U / D motor 11 is stopped.

At this time, the feedback pulse from the photo sensor 16 counts the number of slits detected until the U / D motor 11 starts rotating and the platen 2 comes into contact with the ribbon protector bracket 3, and this count number is counted. Is stored as the distance from the initial position of the platen 2 to the ribbon protector bracket 3, and then,
The U / D motor 11 is rotated in the opposite direction to return the platen 2 to the initial position.

Next, when the medium is conveyed by the feed roller 4 and positioned between the print head 1 and the platen 2,
The thickness of this medium is detected. That is, the U / D motor 1
By sending a forward signal to 1, the U / D motor 11 is rotated in a predetermined direction, and the platen 2 at the initial position is moved in a direction approaching the medium.

When the forward signal is continuously sent to the U / D motor 11, the medium is pushed up by the platen 2 and comes into contact with the ribbon protector bracket 3, which is detected by the pressure detection sensor 17 to rotate the U / D motor 11. Stopped. At this time, the feedback pulse from the photo sensor 16 counts the number of slits detected until the U / D motor 11 starts rotating and the medium comes into contact with the ribbon protector bracket 3. As described above, the distance between the initial position of the platen 2 and the ribbon protector bracket 3 is stored, and the slit detected before the U / D motor 11 starts rotating and the platen 2 contacts the ribbon protector bracket 3 is detected. The difference from the counted number when the number is counted is obtained, and this difference is stored as the thickness of the medium.

Then, an optimum gap g is set according to the medium thickness, the U / D motor 11 is rotated by a predetermined amount in the opposite direction to the above, and the platen 2 is moved in a direction away from the ribbon protector 3. After the gap g is provided between the medium and the ribbon protector bracket 3, the U / D motor 1
Stop 1 FIG. 3 is a perspective view showing the main configuration of the serial printer.

In the drawing, reference numeral 18 is a carriage unit on which the print head 1 is mounted. 19 is a belt for moving the carriage unit 18 in the spacing direction, 2
0 is a DC motor that drives the belt 19, 21 is a main shaft that supports the carriage unit 18, 2
Reference numeral 2 is a sub-shaft for guiding the movement of the carriage unit 18.

Reference numeral 23 is a slit disk fixed on the shaft of the DC motor 20, and is provided with a plurality of slits in the circumferential direction. Reference numeral 24 is a photosensor for detecting the slits of the slit disk 23. By counting the number of slits, the rotation amount of the DC motor 20 can be recognized, and by this, the carriage unit that moves by the rotation of the DC motor 20. It is possible to manage 18 positions, moving distances, moving speeds, and the like.

Next, the control block diagram of FIG. 1 will be described. In the figure, reference numeral 30 denotes a platen moving unit, which is composed of the U / D motor 11, the slit disk 13, the photo sensor 16, the pressure detecting sensor 17, and the contact detecting circuit 6 described in FIG. Reference numeral 31 is a platen position management control unit, and this platen position management control unit 31 controls the photo sensor 16 of the platen moving unit 30.
The U / D motor 11 is controlled based on the detection information from the pressure detection sensor 17 and the contact detection circuit 6.

Reference numeral 32 denotes a carriage moving unit, which is composed of the DC motor 20, the slit disk 23 and the photo sensor 24 described with reference to FIG. Reference numeral 33 denotes a carriage position management control unit, and this carriage position management control unit 33 uses the D / C motor 2 based on detection information from the photo sensor 24 of the carriage moving unit 32.
Control 0.

Reference numeral 34 denotes a platen-ribbon protector bracket distance storage unit. In the platen-ribbon protector bracket distance storage unit 34, the distance from the initial position of the platen 2 to the ribbon protector bracket 3 is obtained at different points. At least two are stored. 35
Is a platen gap storage unit, and the platen gap storage unit 35 stores a gap set according to the medium thickness by the operation described in FIG.

Reference numeral 36 denotes a platen basic movement amount storage unit. The platen basic movement amount storage unit 36 obtains the medium thickness of the medium in advance as described in FIG. In order to provide a gap between the medium and the ribbon protector bracket 3, data or the like indicating the amount of movement of the platen 2 according to the medium thickness is stored. Reference numeral 39 denotes a deflection correction storage unit, which indicates the deflection of the platen 2 and the like, which is represented by the difference between the distance between the platen 2 at the initial position and the ribbon protector bracket 3 obtained by the contact detection circuit 6 and that obtained by the pressure detection sensor 17. The amount is stored as a correction amount.

Reference numeral 37 denotes a microprocessor for controlling each of the above-mentioned components, which controls the serial printer by exchanging data between the above-mentioned units and executing arithmetic processing in the arithmetic unit 38. FIG. 4 is a front view of the serial printer showing the measurement position. The operation of the serial printer of the present embodiment having the above-mentioned configuration will be described below. Here, the operation of performing the platen parallelism correction based on the difference between the two distances shown in FIG. 4 will be described.

First, at the time of shipping or maintenance, the deflection correction amount is determined and stored in the deflection correction storage section 39. To determine the deflection correction amount, the microprocessor 37 causes the carriage moving unit 32 to move the carriage unit 18 to the position 1 shown in FIG. That is, the position of the carriage unit 18 is monitored by sending a signal for rotating the D / C motor 20 and the rotation of the slit disk 23 is detected by the photo sensor 24, and the print head 1 is positioned at position 1.

Next, the microprocessor 37 controls the platen moving part 30 to move the platen 2 so that the platen 2 in the initial position moves from the ribbon protector bracket 3 to the ribbon protector bracket 3.
The distance up to is obtained by each of the contact detection circuit 6 and the pressure detection sensor 17. That is, a forward signal is sent to the U / D motor 11 to rotate it, and the platen 2 at the initial position is moved toward the ribbon protector bracket 3.

When a forward signal is continuously sent to the U / D motor 11, the platen 2 and the ribbon protector bracket 3 are
The distance between the platen 2 and the ribbon protector bracket 3 finally comes into contact with each other. The contact between the platen 2 and the ribbon protector bracket 3 is detected by the electrical conduction in the contact detection circuit 6, and at this time, the microprocessor 37 causes the U / D motor 11 to receive the feedback pulse from the photo sensor 16. The number of slits detected by the start of rotation until the contact detection circuit 6 detects contact is counted, and the detection position by the contact detection circuit 6 is confirmed.

When the U / D motor 11 continues to rotate in the forward direction, the pressure detection sensor 17 operates.
The microprocessor 37 stops the rotation of the U / D motor 11 when the pressure detection sensor 17 operates, and
By the feedback pulse from the photo sensor 16,
The U / D motor 11 starts rotating and the pressure detection sensor 17
Counts the number of slits detected before the
The detection position by the pressure detection sensor 17 is confirmed.
Then, the U / D motor 11 is rotated in the opposite direction to return the platen 2 to the initial position.

The microprocessor 37 stores the difference between the detection position by the contact detection circuit 6 and the detection position by the pressure detection sensor 17 in the deflection correction memory 38 as the deflection correction amount T1 at the position 1. Next, after the carriage unit 18 is moved to the position 2 by the same processing as described above, the detection position by the contact detection circuit 6 and the detection position by the pressure detection sensor 17 are confirmed, and the difference between these positions is deflected at the position 2. It is stored in the deflection correction storage unit 38 as the correction amount T2. The operation of detecting and storing the deflection correction amount is
The operation is performed only when there is a registration instruction, and is not updated at the time of initials. That is, the contact detection circuit 6 is
Since electrical continuity is obtained by the contact between the contacts provided on the platen 2 and the ribbon protector bracket 3, the presence or absence of contact can be detected with high accuracy, but erroneous detection is likely to occur due to the influence of dust or the like. Therefore, the correction amount is determined when the condition for normally operating the contact detection circuit 6 is satisfied, such as at the time of shipping or maintenance.

Next, a normal initial operation will be described.
As an initial operation when the power is turned on, the microprocessor 3
Reference numeral 7 controls the carriage moving unit 32 to move the carriage unit 18 to move the print head 1 to the position 1. That is, a signal for rotating the D / C motor 20 is sent, and the rotation of the slit disk 23 is detected by the photo sensor 24, whereby the carriage unit 18 is detected.
Position the print head at position 1.

Next, the microprocessor 37 controls the platen moving unit 30 to move the platen 2 so that the platen 2 in the initial position moves from the ribbon protector bracket 3 to the ribbon protector bracket 3.
The pressure detection sensor 17 finds the distance to. That is, a forward signal is sent to the U / D motor 11 to rotate it, and the platen 2 at the initial position is moved toward the ribbon protector bracket 3.

When the forward signal is continuously sent to the U / D motor 11, the platen 2 and the ribbon protector bracket 3
The distance between the platen 2 and the ribbon protector bracket 3 finally comes into contact, and then the pressure detection sensor 17 operates. When the pressure detection sensor 17 operates, the microprocessor 37 stops the rotation of the U / D motor 11, and the feedback pulse from the photo sensor 16 causes the U / D motor 11 to start rotation, so that the platen 2 causes the ribbon protector bracket to move. The number of slits detected until the contact with 3 is counted, and the counted number is set as a value g1 obtained by the pressure detection sensor 17 for the distance from the initial position of the platen 2 to the ribbon protector bracket 3 at position 1, and A value obtained by subtracting the deflection correction value T1 at the position 1 stored in the deflection correction storage unit 39 from the value g1 is stored as the platen-ribbon protector distance S1 in the platen-ribbon protector bracket distance storage unit 34, and then U / Rotate the D motor 11 in the opposite direction, Return the Latin 2 to the initial position.

Next, the microprocessor 37 controls the carriage moving unit 32 to move the carriage unit 18 to move the print head 1 from the position 1 to the position 2 on the opposite side. As described above, the platen moving unit 30 is controlled to move the platen 2, and the distance from the platen 2 at the initial position in the position 2 to the ribbon protector bracket 3 is obtained by the pressure detection sensor 17. The microprocessor 37 sets the value from the initial position of the platen 2 at position 2 to the ribbon protector bracket 3 obtained by the pressure detection sensor 17 to g2, and this value g
The value obtained by subtracting the deflection correction value T2 at the position 2 stored in the deflection correction storage unit 39 from the platen-
The ribbon protector distance S2 is stored in the ribbon protector bracket distance storage unit 34, and the platen 2 is returned to the initial position.

Then, the microprocessor 37 can determine how much the parallelism of the platen 2 is deviated from the difference between S1 and S2 stored in the platen-ribbon protector bracket distance storage section 34 as described above. it can. That is, the distance between the platen 2 and the ribbon protector bracket 3 at the position 1 is S1 mm, the distance between the platen 2 and the ribbon protector bracket 3 at the position 2 is S2 mm, the distance between the position 1 and the position 2 is L mm, and the platen 2 is operated U If the resolution of the / D motor 11 is Amm and the resolution of the D / C motor 20 that operates the carriage unit 18 is Bmm,
The difference H in height between the platen 2 on the left and right is obtained by the following equation (1).

[0033]

## EQU1 ## H = S1-S2 (1) In addition, since S1> S2 when H is plus in the formula (1) and S1 <S2 when H is minus, the platen 2 of It is possible to determine the direction of inclination. Then U
Since the resolution of the / D motor 11 is Amm, the difference between the heights of the platen 2 on the left and right sides is represented by the number of pulses P1 as shown in the following equation (2).

[0034]

## EQU2 ## P1 = H / A (2) If the distance L between position 1 and position 2 is represented by the number of pulses P2 in accordance with the resolution of the DC motor 20, the resolution of this DC motor 20 is Bmm. Therefore, P2 is expressed by the following equation (3).

[0035]

[Equation 3] P2 = L / B (3) Therefore, the pulse number P3 is obtained by the following equation (4), and the U / D motor 11 is driven by one pulse every time the DC motor 20 is driven by P3 pulses. By driving, the distance between the platen 2 and the ribbon protector bracket 3 can be kept constant.

[0036]

## EQU00004 ## P3 = P2 / P1 (4) In the expression (1), when H = 0, it can be determined that the platen 2 is not tilted. In this case, U /
The D motor 11 is not driven. For example, the distance between the platen 2 and the ribbon protector bracket 3 at position 1 is S1 = 5 mm, and the distance between the platen 2 and the ribbon protector bracket 3 at position 2 is S2 = 5.5.
mm, the distance between position 1 and position 2 is L = 200
mm, the resolution of the U / D motor 11 that operates the platen 2 is A = 0.1 mm, and the resolution of the D / C motor 20 that operates the carriage unit 18 is B = 0.2 mm. The difference H is calculated by the above-mentioned formula (1) and becomes H = -0.5 mm. Since H is negative, the platen 2 in FIG.
Can be determined to be in a state of falling to the left.

When the difference H between the left and right heights of the platen 2 is expressed by the pulse number P1 from the above equation (2), the U / D motor 1
Since the resolution of 1 is 0.1 mm, P1 = −5 pulses. Also, the distance L between position 1 and position 2
Is represented by the number of pulses P2 in accordance with the resolution of the DC motor 20, P2 = 1000 pulses from the above equation (3).

Then, from the equation (4), 1000 pulses, which is the distance between the position 1 and the position 2, is divided by -5 pulses, which is the difference in height between the platen 2 on the left and right sides,
The number of pulses P3 = −200 is obtained. Therefore, in FIG. 4, the D / C is set so that the carriage unit 18 moves to the left.
When rotating the motor 20, set the D / C motor 20 to 2
The U / D motor 11 is rotated by 1 pulse so that the platen 2 is moved upward every time it is rotated by 00 pulses, and conversely, the D / D is moved so that the carriage unit 18 is moved rightward.
When the C motor 20 is rotated, every time the D / C motor 20 is rotated by 200 pulses, the U / D motor 11 is rotated by 1 pulse so that the platen 2 moves downward.

Thus, when the carriage unit 18 is moved left and right for printing, the carriage unit 1
Every time 8 moves by 200 pulses of the DC motor 20, the platen 2 is moved up and down by 1 pulse of the U / D motor 11 so that even if the platen 2 is tilted, it is necessary for printing set according to the medium thickness. The large gap g can be kept constant.

The distance S1 between the platen 2 and the ribbon protector bracket 3 at the position 1 and the distance S2 between the platen 2 and the ribbon protector bracket 3 at the position 2 are determined by detecting the slit disk 13 with the photosensor 16. Since this is represented by the number of pulses according to the resolution of the U / D motor 11, the above example is represented by a general formula, the inclination of the platen 2 is: P1 = S1
-S2, distance between position 1 and position 2: P2,
Platen 2 up / down timing: P3 = P2 /
It becomes P1.

As a result, the carriage unit 18 moves to P
The inclination of the platen 2 is moved up and down by one pulse according to the sign of the inclination: P1 of the platen 2 every time it moves by 3 pulses, so that the inclination of the platen 2 peculiar to each machine is smoothly corrected. It is possible to stably set the gap g required for printing, which is set according to the medium thickness, within an appropriate allowable range.

In this embodiment, the platen side is moved in order to make the gap between the print head and the platen variable, but it is also possible to move the carriage unit side. . As described above, even if the mechanism for moving the carriage unit side is used to make the gap between the print head and the platen variable, when the tilt is corrected, the tilt is corrected when the carriage unit moves in the direction along the platen. Accordingly, the carriage unit may be moved toward or away from the platen.

As a method of correcting the inclination at the time of printing, by performing a process of moving the print head side or the platen side toward or away from the other party as the print head moves in the direction along the platen, The inclination can be corrected without providing a special mechanism. In this case, not only the inclination of the platen is obtained based on the difference in height between two places on the left and right sides, but also the difference between the distances is obtained at a plurality of places and the up / down amount of the platen or the carriage unit is obtained for each section. Then, the inclination can be corrected more accurately.

Further, in order to correct the inclination of the platen, a structure for inclining the shaft supporting the entire platen or the carriage unit may be provided. In this case, when the carriage unit is moved in the direction along the platen for printing, the operation for adjusting the gap is not necessary, the control becomes easy, and the speed can be increased.

Here, in the normal initial operation, the pressure detecting sensor 17 measures the distance from the platen 2 at the initial position to the ribbon protector bracket 3 because the pressure detecting sensor 17 is not affected by dust or the like. The error due to the deflection caused by the pressing force applied until the pressure detection sensor 17 operates must be corrected by the correction amount obtained using both the contact detection circuit 6 and the pressure detection sensor 17. Thus, it is possible to accurately correct the platen parallelism.

[0046]

As described above, according to the present invention, when determining the distance between Printout head and the platen at a plurality of positions on the platen, detecting contact between the print head side and the platen side by the presence or absence of electrical conduction Even if a pressure detection sensor is used, it is possible to obtain the distance using both the contact detection circuit and the pressure detection sensor that operates by pressure to detect contact, and correct the difference as an error due to deflection caused by the pressing force. It is possible to find the distance between the print head and the platen.

Therefore, even when the distance between the print head and the platen is measured at the central portion of the platen, particularly at the central portion of the wide printer, the distance can be accurately obtained, and even for a large printer. Therefore, the platen parallelism correction can be accurately performed. As a result, even if the platen parallelism changes due to assembly error or use, a constant gap required for printing can always be maintained, dot dropouts and medium jams can be prevented, and high-quality printing can be provided. You can

Further, since the correction amount for correcting the error due to the deflection caused by the pressing force applied until the pressure detection sensor operates, the correction amount is obtained by using the output of the contact detection circuit which detects the contact depending on the presence or absence of electrical conduction. The correction amount can be accurately obtained, and when correcting the tilt during normal use, the output of the pressure detection sensor is used, so there is no influence of dust, etc. A malfunction can be prevented by using a combination of detection sensors.

[Brief description of drawings]

FIG. 1 is a control block diagram showing an example of an embodiment of a serial printer of the present invention.

FIG. 2 is a side view showing a platen up / down mechanism.

FIG. 3 is a perspective view showing a main configuration of a serial printer.

FIG. 4 is a front view of the serial printer showing a measurement position.

[Explanation of symbols]

1 print head 2 Platen 6 Contact detection circuit 13 slit disc 16 Photo sensor 17 Pressure sensor 37 microprocessors 39 Deflection correction storage unit

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41J 11/20

Claims (7)

(57) [Claims] 1. A serial printer including a gap adjusting means for adjusting a gap formed between a platen and a print head, wherein the print head side and the platen are arranged in the gap adjusting direction.
One of the movable sides is the movable side and the other is the fixed side. When the movable side and the fixed side come into contact,
The contacts provided on each contact each other and electrical conduction is obtained.
Contact detection that detects the contact between the movable side and the fixed side
Means and the pressure generated after the movable side and the fixed side are in contact with each other.
The pressure detection means that detects the contact between the movable side and the fixed side.
The contact detection means is provided at a plurality of detection locations on the platen.
And the use of the pressure detection means, the initial position of the movable side
From the contact position to the fixed side
A distance detected when the contact is detected by the contact detecting means,
The difference from the distance detected at the time of contact detection of the pressure detection means
Occurs when contact is detected by the pressure detection means at each detection location.
Deflection correction amount is obtained in advance , and at the time of initial operation, the pressure detection
Connection of the movable side from the initial position to the fixed side by using a step
Each distance to the touch is detected and
The value obtained by subtracting the value of the deflection correction amount from the value of the detection distance
Originally, the inclination of the movable side with respect to the fixed side and its direction
The orientation of the platen and the print head based on the result of the determination.
A serial printer characterized by compensating for gaps formed between them . 2. The serial printer according to claim 1, wherein the movable side is a print head side . 3. The serial printer according to claim 1 , wherein the movable side is a platen side . 4. A serial printer according to claim 1 or 2 Symbol placement, with the movement direction along the platen of the print head, the printing
How to move the head side toward or away from the platen side
The print head and the platen so that the gap between the print head and the platen is
Serial printer, characterized in that kept constant. 5. A serial printer according to claim 1 or 3, wherein, with the movement direction along the platen of the print head, Pla
How to move the ten side closer to or away from the print head side
The print head and the platen so that the gap between the print head and the platen is
Serial printer, characterized in that kept constant. 6. The serial printer according to claim 1 or 2, wherein the shaft supporting the carriage mounting the print head
A serial printer characterized by having a mechanism for changing the inclination . 7. The serial printer according to claim 1 or 3, further comprising a mechanism for changing the inclination of the platen .