CN1163357C - printer - Google Patents

Abstract

The present invention provides a printer capable of improving a print quality by preventing damping of a print head. This printer comprises a linear motor 2 that has a driving current controlled by a microcomputer and reciprocally moves the print head 1 along each line, elastic springs 5A, 5B each of which applies a reverse urging force to the print head 1 at a time when the print head 1 moves in the reverse zones each being positioned in the vicinity of each of both ends of a reciprocal movement interval of the print head 1 and a linear encoder 6 for detecting the moving position of the print head 1. The microcomputer applies a driving current to the linear motor 2 through a switching circuit in order to generate a force for canceling the reverse urging forces by virtue of the elastic springs 5A, 5B during the movement of the print head 1 in the reverse zones. The microcomputer controls the driving current based on a predetermined pulse signal pattern such that the driving current is gradually varied in a pulsating manner.

Description

Printer

The present invention relates to one side and make printhead move back and forth the printer of the click type printed line by line of one side etc., particularly relate to the printer that the reciprocating motion of printhead is controlled well.

The click type printer is that a kind of printhead that many pins are aligned along the direction vertical with used printing paper throughput direction that utilizes is concentrated the printer of getting a typewriting row.In this printer, one side makes printhead move back and forth along the direction vertical with print paper, and one side optionally makes pin be with to the typewriting paper flank attack from China ink and throws line printing into.

As the mechanism that printhead is moved back and forth,, generally adopt linear motor and linear encoder etc. for moving back and forth zone line in interval with certain basically speed mobile print head.In addition, in order near moving back and forth interval two ends, to make the printhead counter-rotating, utilize the compression of spring to extend the counter-rotating loading force that is produced.Adopt this spring, when arriving when moving back and forth near the reversal zone that sets the interval two ends with the printhead of constant speed movement, because the counter-rotating loading force of this spring and slowing down gradually at zone line.And then last when the counter-rotating loading force along with further retarding spring increases gradually, the unexpected change of printhead is quickened in the opposite direction.And then, quicken one side when the reversal zone enters zone line when one side, on printhead, there has not been the effect of the loading force that reverses, once more with the constant speed movement printhead.Control the printhead that this repeatedly action moves back and forth, make it during promptly with constant speed movement, to print with certain speed.

But, make in the printer that printhead moves back and forth,, need and printing model can be switched in for example multiple grades such as low speed, usual speed, high speed in order to satisfy user's multiple needs above-mentioned.The translational speed of printhead can change according to printing model, but the occasion that moves back and forth at a high speed at printhead, spring needs sizable counter-rotating loading force.Therefore, as non-print zone, just, the part of zone line and the reversal zone that is attached thereto is arranged between print zone regularly from the way of the reversal zone of counter-rotating loading force that size is arranged in the printhead effect to a certain degree.

Here, when consider switching printing model and make the occasion that printhead low speed moves, preceding portion and the later half portion that withdraws from of partly entering in the reversal zone, for making it to coincide with print zone, even also exist the effect of the counter-rotating loading force of spring, printhead is entered with constant speed move or withdraw from mobile.Therefore, need be by means of counter-rotating drive current control linear motor, so that produce the driving force of eliminating the counter-rotating loading force, but only pass to constant counter-rotating drive current, can not make the driving force that produced follow the tracks of the counter-rotating loading force that elastic deformation produced, thereby exist the problem that vibration takes place printhead because of spring.

On the other hand, zone line in the counter-rotating loading force effect that does not have spring, can make printhead in constant speed movement in the gamut of low speed～high speed, at this moment for producing suitable driving force, drive linear motor by the constant speed drive current, but when low speed, because the driving force of linear motor is strong, printhead low speed is moved and when keeping certain speed,, also exist the problem that vibration takes place on printhead when controlling one side in this occasion.

Above-mentioned variety of issue is not limited only to the machine of changeable printing model, all has these problems for all printers that printhead is moved back and forth, and the vibration that takes place on the printhead of print area constant speed movement directly causes the deterioration of print quality.

The present invention considers the problems referred to above and makes, its objective is provides a kind of printer, described printer makes printhead move back and forth with stable certain speed whole will printing in action interval, prevents from that printhead from producing to vibrate, and can improve print quality.

For achieving the above object, the present invention takes following technical measures.

Promptly, according to the first string of the present invention, a kind of printer is provided, have: the printhead of printing action line by line, by provide drive current to make above-mentioned printhead via switching device along the reciprocating reciprocator of each row, with near the two ends in the reciprocating motion interval of above-mentioned printhead as the reversal zone, apply the charger of counter-rotating loading force with respect to the above-mentioned printhead that moves in this reversal zone, and detect in the printer of checkout gear of the position of above-mentioned printhead in above-mentioned reciprocating motion interval, be equipped with the drive current control device, described control device at above-mentioned printhead during moving between above-mentioned reversal zone, in order to produce the power that counter-rotating loading force that above-mentioned charger produces offsets, supply drive current via above-mentioned switching device to above-mentioned reciprocating apparatus, and, control above-mentioned switching device according to the signal that detects by above-mentioned detection device on the other hand for making this drive current pulsating and changing by stages.

Adopt this printer, make the part of reversal zone become a part between print zone, on this part of reversal zone, though the effect printhead of counter-rotating loading force that still has charger is still with constant speed movement, to the reciprocating moving device drive current, to offset the counter-rotating loading force.At this moment,, thereby the power of this counter-rotating loading force of the good counteracting of tracing property can be produced, the vibration of printhead can be prevented effectively in the reversal zone owing to drive current changes with pulsation and mode stage by stage according to the counter-rotating loading force that changes.Thereby, can be between print zone in one side make printhead move one side with certain speed to print action, improve print quality.

According to second scheme of the present invention, a kind of printer is provided, have: the printhead of printing action line by line, by the mobile device that provides drive current that above-mentioned printhead is moved back and forth along each row via switching device, near the two ends with moving back and forth of above-mentioned printhead in interval as the reversal zone, above-mentioned printhead when moving in this reversal zone applies the charger of counter-rotating loading force, and detect above-mentioned printhead in the printer of the above-mentioned detection means that moves back and forth the position in interval, the drive current control device is equipped with, described drive current control device, above-mentioned printhead except that above-mentioned reversal zone in the above-mentioned mesozone that moves back and forth in interval move during in, for certain speed of keeping this printhead via above-mentioned switching device to above-mentioned reciprocating moving device input drive current, make this drive current in the mode of pulsation and change minutely according to control above-mentioned switching device by the detection signal of above-mentioned detection device on the other hand.

Adopt this printer, as between print zone,, reciprocating moving device is imported drive current, to obtain certain speed for making printhead constant speed movement in this mesozone with the mesozone.At this moment,, can not change significantly by the speed that reciprocating moving device produced owing to drive current is pulsating and carries out minor variations, very stable, can prevent the vibration of printhead effectively in the mesozone.Thereby can simultaneously make printhead move back and forth one side with stable certain speed and print action, improve print quality at print zone.

Other features and advantages of the present invention, will become apparent the explanation of embodiments of the invention by with reference to the accompanying drawings.

Fig. 1 is the sketch of schematic configuration of an embodiment of expression printer of the present invention.

Fig. 2 is that expression is built in the block diagram according to the structure of the microcomputer in the printer of present embodiment.

Fig. 3 is the speed of expression explanation printhead when moving back and forth with low speed and the key diagram of the relation between displacement and the power that is applied to it.

Fig. 4 represents the curve map of the velocity variations of printhead when high speed and low speed respectively.

Fig. 5 is the key diagram that expression illustrates the waveform of the drive current of being controlled according to the pulse signal figure.

Fig. 6 key diagram that to be expression compare according to the example of the speed shake waveform of the printhead of present embodiment and prior art.

With reference to the accompanying drawings the preferred embodiments of the present invention are specifically described.

Fig. 1 is the embodiment of expression conduct according to printer of the present invention, the sketch of its rough structure.In addition, the present invention has the feature that the reciprocating motion of printhead is controlled, and its basic structure is same as the prior art, thereby has suitably omitted illustrating that it is carried out.

As shown in Figure 1, printer has the printhead 1 of printing action line by line, produce the linear motor 2 of driving force by the interaction of magnetic field and electric current, support the fixed axis 4 of printhead 1 can move freely the ground mode along reciprocating direction S, be arranged near a pair of spring 5A that on this fixed axis 4, when printhead 1 is mobile back and forth interval two ends, gives elasticity loading force (counter-rotating loading force), 5B, and be used to detect printhead at the linear encoder 6 that moves back and forth the position in interval etc.In addition, in this printer, built-in the drive current of providing for linear motor 2 is carried out the microcomputer that on-off circuit (switching device) that ON/OFF uses and back will be described, utilize this microcomputer that exercises are controlled.

In brief, printer according to present embodiment, be the printer that a kind of mode of utilizing click prints to continuous paper (omitting among the figure), a plurality of print needles (omitting among the figure) along the direction vertical with the throughput direction F of continuous paper with the state device of proper alignment on printhead 1.The structure of this printhead 1 is when it moves back and forth along the throughput direction F perpendicular to continuous form, optionally carry out pin is moved from the printing that China ink band (omitting the figure) impacts the continuous form side, thereby the printing of delegation's word to be carried out in the concentrated area.

When printhead 1 is moved back and forth, in order to make it to have good print quality as much as possible, must printhead be moved, for realizing this reciprocating motion, adopt linear motor and linear encoder etc.Linear motor 2 has permanent magnet and solenoid as reciprocating moving device not shown but that the back will be described, and by controlling the drive current that leads to this coil through on-off circuit, generation is carried out linear reciprocation and moved necessary driving force.Pass to printhead 1 by the rectilinear motion with linear motor 2, printhead 1 moves along reciprocating direction S.

Here, constant speed coil and counter-rotating coil are arranged in the solenoid, the constant speed coil mainly produces and is used for the motive force that printhead 1 moved with certain speed, the counter-rotating coil then mainly produces necessary motive force when making printhead 1 counter-rotating, and make these coils be in the drive current of "on" position, then based on the figure of pulse signal described later, be controlled according to timing by the detection signal of linear encoder 6 outputs.Utilize this linear encoder 6, shift position detection signal according to the shift position output pulse form in moving back and forth of printhead 1 is interval, on the other hand, when printhead 1 arrives when being set in the reversal zone that the back that moves back and forth the vicinity, two ends, the left and right sides in interval will describe, export the backward position detection signal.In other words, linear encoder 6 is used as the checkout gear that detects the position of printhead 1 in moving back and forth the interval.

On the other hand, make printhead 1 counter-rotating, utilize spring 5A, the counter-rotating loading force that the compression elongation of 5B is produced in order to be accompanied by to move back and forth.This spring 5A, 5B is collected in the movable limit block 4A that is separately positioned on the fixed axis 4 respectively, and 4B and end 1A towards the reciprocating direction S of printhead 1 are in the gap between the 1B.With respect to printhead 1 each movable limit block 4A, 4B particularly is connected on the linear motor 2 in the mode towards the opposite direction motion of the not shown moving direction with printhead 1.For example, when printhead 1 was positioned near the position that moves back and forth the interval right-hand member, the spring 5B in left side was in the state that is compressed between end 1B and the movable limit block 4B, produced the loading force that reverses by the compression of this spring 5B and acted on left with respect to printhead 1.Otherwise when printhead 1 was positioned near the position that moves back and forth the interval left end, the spring 5A on right side was in the state that is compressed between end 1A and the movable limit block 4A, was acted on to the right with respect to printhead 1 by the counter-rotating loading force of the compression generation of this spring 5A.By spring 5A, the zone of the counter-rotating loading force effect that 5B produces is called " reversal zone " by this.On the other hand, spring 5A in the left and right sides, 5B is in end 1A, 1B and movable limit block 4A, the occasion of freely-movable state between the 4B does not exist by two spring 5A, and the counter-rotating loading force that 5B produces is to the effect of printhead 1, do not have a spring 5A with this, the zone of the counter-rotating loading force effect that 5B produces is called " mesozone ".Generally speaking, spring 5A, 5B are used as printhead and when mobile, printhead 1 are applied the charger of counter-rotating loading force in the reversal zones.

Here, the interval that moves back and forth of printhead is divided near be set in the two ends, the left and right sides reversal zone and mesozone betwixt, import the constant speed drive current in the mode that certain basically speed makes printhead 1 move in this mesozone to the constant speed coil of linear motor, meanwhile control printhead 1 and print action.In addition, in the present embodiment, the part place in the reversal zone that is connected with the mesozone also controls the action of printhead 1, will be illustrated in the back about this point.

Fig. 2 is that expression is built in block diagram according to the structure of the microcomputer in the printer of present embodiment, and is as shown in the drawing, and microcomputer is by utilizing bus with MPU10, ROM11, RAM12 and interface 13 formation that is connected with each other.Linear motor 2 and linear encoder 6 are connected on the interface 13.MPU10 also controls the reciprocating action of printhead 1 for the drive current of linear motor 2 by control except that control is moved by the printing that printhead carried out.ROM11 storage should be by data such as control program that MPU10 carried out and setting values.RAM12 is used to the operating area of MPU10 etc.13 input and output contacts that play a part for MPU10 of interface.Linear encoder 6, as previously described, except that the shift position detection signal S1 of output according to the position of printhead 1, the backward position detection signal S2 of each side reversal zone about also output expression printhead 1 arrives, S3 is for the constant speed coil 2A input constant speed drive current D1 of linear motor 2, on the other hand, for counter-rotating coil 2B, input counter-rotating drive current D2.Microcomputer with this structure, the back will be elaborated to its action, constituted a kind of drive current control device, this drive current control device at printhead 1 during the reversal zone moves, offset by spring (charger) 5A for producing, the required power of counter-rotating loading force that 5B produces, on linear motor (reciprocating moving device) 2, import drive current via on-off circuit, on the other hand, for this drive current being pulsedly and changing by stages, according to on-off circuit being controlled by linear encoder (checkout gear) 6 detected detection signals.

And then Fig. 3 is an expression explanation printhead when moving back and forth with low speed, and speed and displacement and the key diagram that acts on the relation of the power on them, Fig. 4 are to represent respectively when high speed and print head speed changes during low speed speed curve diagram.In addition, in the printer of present embodiment, typewriter mode can be at low speed, and common, a plurality of ranks such as high speed are switched, and the translational speed of printhead 1 also changes according to printing model.Particularly, as shown in Figure 4, for example when printhead 1 moves back and forth with high speed, its control mode is, by spring 5A, 5B has the reversal zone of the effect of counter-rotating loading force to a certain degree, and printhead 1 little by little slows down or quickens, then as state, make printhead 1 keep constant speed in the mesozone of the loading force that do not reverse to constant speed coil 2A energising.In addition, in this case,,, utilize the printhead 1 that quickens and slow down also in a certain period, to print action even in the reversal zone because what problem is the typewriting quality do not have.

On the other hand, as shown in Figure 3 and Figure 4,,,, in the part of the reversal zone of the counter-rotating loading force effect of 5B, also control printhead 1 and move with certain speed at spring 5A for obtaining good print quality in the occasion that printhead 1 moves back and forth with low speed.Specifically, as Fig. 3 was clearly represented, when moved the mesozone of X1 to X2, MPU10 imported the constant speed drive current in the constant speed coil 2A of linear electric machine 2, only utilize the motive force of this constant speed coil 2A to make printhead 1 constant speed movement at printhead 1.At this moment, be input to the constant speed drive current of constant speed coil 2A, controlled must be according to pulsing and minor variations by the timing of the shift position detection signal S1 of linear encoder 6 output, this constant speed drive current is according to being set in advance in constant speed in the ROM11 etc. and driving and control with the pulse signal figure for making printhead 1 become certain speed.

Arrive from the reversal zone between the X2 to X3 (right side) and when exporting right side backward position detection signal S3 when detected printhead 1 by linear encoder 6, the counter-rotating loading force that becomes spring 5B acts on the state on the printhead 1.At this moment, for produce the motive force of offsetting the counter-rotating loading force on linear electric machine 2, MPU10 is not only to constant speed coil 2A input constant speed drive current, also to counter-rotating coil 2B input counter-rotating drive current.Thereby, by spring 5A, the counter-rotating loading force that 5B produces with by constant speed and counter-rotating coil 2A, the motive force that 2B produces offsets, printhead 1 one side continues to keep constant speed simultaneously to move.In addition, at this moment be input to the constant speed drive current among the constant speed coil 2A, different with occasion in the mesozone of X1 to X2, be controlled so as to corresponding to the motive force of pointing to certain orientation (right-hand).

And then, when printhead 1 moves from X3 to X4, also as before, to constant speed and counter-rotating coil 2A, 2B imports constant speed drive current and counter-rotating drive current to MPU10, controls to make printhead 1 keep constant speed by respectively, but because spring 5B compression, the counter-rotating loading force increases gradually.Maximum feature part as present embodiment is, along with the counter-rotating loading force of this variation on constant speed coil 2A and counter-rotating coil 2B motive force takes place, therefore, MPU10 controls constant speed drive current and counter-rotating drive current according to the pulse signal figure that is set in advance on the ROM11 etc.

Consider printhead 1 below when low speed, the situation when moving from X4 to X5 is in this interval, only there is the counter-rotating loading force of spring 5B to act on the printhead 1, owing to be necessary to make the direct of travel counter-rotating of printhead 1,, interrupt "on" position so do not drive constant speed coil 5A and counter-rotating coil 2B.That is, only, slow down gradually from the constant speed movement state by the printhead 1 of the counter-rotating loading force effect of spring 5B, at last at the low order end of X5, its direct of travel counter-rotating.Then, the printhead 1 that direct of travel has reversed move to from X5 X6 during, for this printhead 1 is fully quickened, have only the counter-rotating loading force of spring 5B to act on the printhead 1.

Then, printhead 1 through X6 to X7 when X8 moves, spring 5B elongation, its counter-rotating loading force reduces gradually, in this interval, for make it to become constant speed the same from the interval of X2 to X4, MPU10 carries out switch control with pulsating and mode stage by stage to drive current as before.Thereby the printhead 1 that moves to X8 from X6 becomes with certain speed and moves.

Fig. 5 is the key diagram that expression illustrates the waveform of the drive current of controlling according to the pulse signal figure, as shown in the drawing, drive current determines its size according to the dutycycle of pulse signal, and the waveform of this pulse signal will be for carrying out waveform after waveform generates according to the rising front by the shift position detection signal S1 of linear encoder 6 outputs by the not shown pulse signal figure that digital numerical value constituted.That is,, control drive current according to predefined pulse signal figure and make it near desirable current curve for the counter-rotating loading force of offsetting at reversal zone spring 5B makes printhead 1 become certain speed.

In addition, the pulse signal figure according to the switching of printing model, as low speed usefulness, different types of figure such as uses at a high speed to be stored among the ROM11 in advance.In addition, though the interval during corresponding to low speed from X6 to X8, the counter-rotating loading force reduces printhead 1 also can constant speed movement, drive current shown in Figure 5 is controlled, is made motive force this drive current be reduced with descending gradually, and when low speed in the interval of X2 to X4, with above-mentioned opposite, when the counter-rotating loading force increased, for making the constant speed movement of printhead 1, the mode that progressively increases motive force with the waveform that will reverse about current waveform shown in Figure 5 was controlled drive current.And then pulse signal waveform shown in Figure 5 is the waveform according to the timing generation of the rising front of the shift position detection signal S1 that is exported by linear encoder 6, but also can make the waveform that generates into the timing by trailing edge.And then, also can be with backward position detection signal S2 by linear encoder 6 output, S3 is as triggering, according to timing production burst signal waveform during preset time of the signal of output periodically such as timer.

Referring again to Fig. 3 below considers by the situation after the X8, at this moment having become the counter-rotating loading force that is produced by spring 5B can not affact by the state on the printhead 1 of X8, then, to control printhead 1 action the X1 ' shown in the parantheses-X8 ' interval in the drawings from the same mode of a series of actions of X1 to X8 with above-mentioned.By carrying out this action repeatedly, printhead 1 moves back and forth from the mesozone to the reversal zone.At then mesozone (X1～of printhead 1 X2) in a part (X2～X4 of reversal zone, among the X6～X7) when mobile, at spring 5A, under the active state of the counter-rotating loading force that 5B produces, because control constant speed and counter-rotating coil 2A changeably in the mode of offsetting the counter-rotating loading force dexterously, the drive current of 2B, printhead 1 can not occur vibrating and move with approximate certain speed, make printhead 1 print action in this case, can guarantee good print quality.

Fig. 6 is the key diagram that the speed of the printhead of embodiment shake waveform and prior art example is compared explanation, as to these figure more as can be seen, utilize the example of prior art, whole by mesozone and the interval that forms by the reversal zone (X6 '～X4) in, electric current becomes labile state, adopt present embodiment, by the mesozone (X1～X2) to reversal zone preceding partly enter portion (X2～X4) and later half withdraw from portion (X6 '～X1) the continual and steady drive current of acquisition.This is owing to be input to constant speed and counter-rotating coil 2A, the result of constant speed drive current among the 2B and counter-rotating drive current according to predefined pulse signal figure control.Promptly, no matter the translational speed of printhead 1 is low speed or high speed, by according to the figure of pulse signal to constant speed and counter-rotating coil 2A, the 2B input is near Utopian drive current, printhead 1 is moved with stable certain speed in printing the interval of action, can prevent the vibration of printhead 1 effectively.Particularly when low speed, by constant speed and counter-rotating coil 2A, the motive force of 2B can be offset spring 5A effectively, and the counter-rotating loading force of 5B can be from the mesozone up to the part of reversal zone, and the printhead 1 in keeping moving is in certain basically speed.

In addition, the present invention is not limited to the foregoing description.

For example, among the top embodiment, pair of right and left spring 5A is set, 5B, but only also can adopt by the structure of a spring to printhead 1 effect counter-rotating loading force, the number of spring and configuration do not have certain restriction.

As making printhead 1 reciprocating device be not limited to the linear electric machine 2 of linear reciprocating motion, also the mechanism that can be transformed into linear reciprocating motion through rotatablely moving extracts the power of electric rotating machine.

In addition, the interval that makes printhead 1 make constant speed movement not only also can comprise the part of reversal zone when high speed when low speed, as long as can make printhead 1 print action, can not control drive current by the pulse signal figure that is stored among ROM11 etc. with certain speed yet.

In addition, the speed of making to become response printhead 1 is here switched makes the pulse signal graphic change, also can respond the spring 5A that timeliness causes, 5B is lax, and the rise motive force that causes of temperature descends and changes the figure of pulse signal.

As mentioned above, according to the present invention, owing to change drive current by stages according to the counter-rotating loading force pulsation ground that changes, can produce the counteracting power of this counter-rotating loading force of the good counteracting of tracing property, thereby can prevent the vibration of the printhead in the reversal zone effectively.In addition,, can not change significantly, become stable, thereby can prevent vibration effectively at the printhead of mesozone by the driving force that linear electric machine produced owing to making drive current pulsation ground in the mesozone and carrying out small variation.Therefore, between the print zone that the part by mesozone and reversal zone constitutes in, one side makes printhead move back and forth one side with stable certain speed and prints action, can improve print quality.

If at printhead in the way that the reversal zone moves, finish in the acceleration that produces because of the counter-rotating action, in during the constant speed movement, minimizing along with the counter-rotating loading force that produces by spring, little by little reduce drive current, and at printhead in the way that the reversal zone rotates, in during beginning with constant speed movement by the counter-rotating action, little by little increase the words of drive current along with increase by the counter-rotating loading force of spring, can produce the good counteracting power of resisting with the counter-rotating loading force of tracing property according to drive current, can prevent the vibration of printhead effectively.

In addition, if according to timing by the output of linear encoder detection signal, perhaps according to the timing of some cycles, predetermined pulse signal graph based on regulation can be controlled drive current with changing, according to the type of switching multiple pulse signal figure from the input instruction of outside, on the other hand, corresponding this switching and being based upon makes printhead become certain speed between print zone and the pulse signal figure set, control the words of drive current changeably, can be controlled at the power that produces on the linear electric machine best, even switching according to this pulse signal figure, when the translational speed of printhead is low speed, in between the print zone of a part that comprises mesozone and reversal zone, printhead is moved with certain velocity-stabilization ground.

Claims (2)

1, a kind of printer, the reciprocating moving device that includes the printhead that prints action line by line, provides drive current to make above-mentioned printhead to move back and forth via switching device along each row, with above-mentioned printhead move back and forth two ends in district's valve nearby as the reversal zone, above-mentioned printhead when moving in this reversal zone reversed loading force charger and detect above-mentioned printhead at the above-mentioned checkout gear that moves back and forth the position in interval, it is characterized by

This printer has the drive current control device, this device is used for making that to above-mentioned reciprocating moving device input drive current the power of the counter-rotating loading force that above-mentioned charger produced is offset in generation during above-mentioned printhead moves in above-mentioned reversal zone via above-mentioned switching device, on the other hand according to by the detection signal of above-mentioned detection device output above-mentioned switching device being controlled with making above-mentioned drive current pulsation and being changed by stages.

2, printer according to claim 1 is characterized by,

Above-mentioned drive current control device is used for making above-mentioned printhead this printhead during move the above-mentioned mesozone that moves back and forth in the interval except that above-mentioned reversal zone keep certain speed via above-mentioned switching device to above-mentioned reciprocating moving device input drive current, on the other hand according to by the detection signal of above-mentioned detection device output above-mentioned switching device being controlled with making above-mentioned drive current pulsation and being changed by stages.

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