CN1221397C - Printing apparatus - Google Patents

Abstract

This invention relates to a printer comprising a linear driving member for reciprocally moving a printing unit along a constant direction, and an reversal energizing force unit for exerting reversal energizing force on the printing unit in the vicinity of both ends of a reciprocally moving section when the printing unit is reciprocally moved and a detection member for detecting the position of the printing unit and performing the following operation: a reversal control in an end section of the reciprocating zone, a stop control and a restart control. The printer comprises a current control member for variably controlling supply of electrical current to the linear driving member based on the position of the printing head unit in the reciprocating zone detected by the detection member.

Description

Printing equipment

Technical field

The driving force that for example the present invention relates to linear electric machine is that active force makes print head assembly move back and forth the printing equipment that prints along certain direction.

Background technology

For example, as impacting mode to the printing equipment that continuous bill etc. carries out flying print, possess: be used to linear electric machine that print head assembly is moved back and forth along certain orientation with point; When on one side constant speed/return motion on one side moves back and forth by the driving force print head assembly of this linear electric machine, near the spring that moves back and forth the interval two ends print head assembly effect counter-rotating potential energy power; The linear encoder of the displacement when the detection print head assembly moves back and forth etc.

Its formation is in this printing equipment, and print head assembly is connected on the linear electric machine through belt pulley mechanism, and the instruction starting linear electric machine according to the control section of microcomputer etc. sends moves back and forth by this driving force print head assembly thus.This linear electric machine is configured to, and the movable member that motor coil is installed moves the double effect of playing as balance weight of this movable member in the opposite direction through belt pulley mechanism and print head assembly.And then, near the two ends in the interval that print head assembly moves back and forth, be provided with spring, be used for print head assembly effect counter-rotating potential energy power, the power of the counter-rotating potential energy power that produces with this spring of combination and the driving force of linear electric machine, print head assembly is switched to return motion from movement at the uniform velocity, perhaps carries out the phase anti-switching.

Position when print head assembly moves back and forth and speed, according to calculating by control section from the detection signal that with the linear-scale is the linear encoder of detected object, print head assembly is fed control thus, moves back and forth with the translational speed along predefined rate curve.This FEEDBACK CONTROL, by changing the direction and the current value of drive current that is offered the motor coil of linear electric machine by control section, perhaps the energising of drive current moment of beginning/finishing carries out.When printing action, when print head assembly moves back and forth, along sending print paper to this direction that moves back and forth the direction quadrature, at the print head assembly that colour band is positioned under the state on the printing paper from it printing paper is got syringe needle, printing ink is transferred on the print paper thus, prints.

In a word, the interval that print head assembly moves back and forth is divided into occupying between its middle body prints action in constant speed movement print zone and occupying and moves back and forth interval two end portions is carried out the paper feeding action in the counter-rotating action paper feeding interval.On the other hand, between the reversal zone of the counter-rotating potential energy power effect that spring produces, occupy near the two ends that move back and forth the interval that comprise the paper feeding interval, but because the counter-rotating active force that spring produces, between print zone, also work, thus between the reversal zone with print zone between mutual interference part superposition mutually is set.

That is, the control of print head assembly is as follows.When carrying out continuous every line printing action, print head assembly between print zone to moving between the reversal zone after the direction conversion, between the reversal zone once more through between another reversal zone, moving between print zone, such action is carried out repeatedly.At this moment, even also be that print head assembly carries out the paper feeding action in counter-rotating near the paper feeding interval of two end portions between the reversal zone.On the other hand, when print head assembly reverses, always be not limited to, also have situation, perhaps do not send the situation of the order of printing next line here than longer usually paper feeding with the certain-length paper feeding.At this moment, print head assembly is kept out of the way on the inoperative position of counter-rotating potential energy power owing to send the driving force opposite with the counter-rotating potential energy power of spring to linear electric machine, is in temporary transient halted state.Thereafter, according to the end of paper feeding action with receive print command, print head assembly moves back and forth action once more, thus, even owing to also can promptly move than the longer usually paper feeding and the delay of print command.

But, make print head assembly reverse continuously, keep out of the way, stop, when starting, because relevant with the dynamic characteristic of spring is discrete, and the variation that depends on the linear electric motor power of variations in temperature, the problem that exists print head assembly not move along predetermined rate curve all the time.

For example, Fig. 8 is the key diagram that is used to illustrate in the past counter-rotating, keeps out of the way, stops, starting control, but shown in the part of representing with symbol C of this figure, if the driving force Yin Wendu of linear electric machine rises and descends, print head assembly to keep out of the way action (E) insufficient, print head assembly is moved beyond usually should begin to move back and forth action owing to can not begin to restart (G) from regular stop position once more as the position (F) of halted state, thereby the translational speed disorder.In addition, under the situation of the part of representing with symbol D,,, produce stroke defect so can not break away between print zone because print head assembly starts once more under non-stop state almost.

Summary of the invention

The present invention proposes having considered the problems referred to above, and is a kind of under the situation that makes print head assembly reverse continuously, keep out of the way, stop, starting even its problem provides, and also can not reduce print processing ability, the printing equipment that stably moves.

In order to solve above-mentioned problem, in the present invention, taked following technical scheme.

That is, the 1st scheme of the present invention is the printing equipment that has with lower unit: linear drive unit is used to make print unit to move back and forth along certain orientation; Afterburning unit reverses, when print unit leans on the driving force of linear drive unit to move back and forth, near moving back and forth interval two ends, print unit is applied counter-rotating potential energy power, and has a control module, when the opposite driving force of counter-rotating potential energy power that makes the linear drive unit generation with the afterburning unit of counter-rotating, print unit is temporarily kept out of the way be not subjected to and reversed on the position of effect of potential energy power, start once more after this is kept out of the way under the situation of print unit, variable control applies moment of the interval foldback of counter-rotating potential energy power to this print unit from keeping out of the way stop position to the afterburning unit of counter-rotating.

In addition, the 2nd scheme of the present invention is the printing equipment that has with lower unit, and linear drive unit is used to make print unit to move back and forth along certain orientation; Afterburning unit reverses, when print unit leans on the driving force of linear drive unit to move back and forth, near moving back and forth interval two ends, print unit is applied counter-rotating potential energy power, and has a control module, when the opposite driving force of counter-rotating potential energy power that makes the linear drive unit generation with the afterburning unit of counter-rotating, print unit is temporarily kept out of the way be not subjected to and reversed on the position of effect of potential energy power, start under the situation of print unit after this is kept out of the way once more, make this print unit from keeping out of the way stop position when the afterburning unit of counter-rotating applies the regional foldback of counter-rotating potential energy power, control should offer the drive current of linear drive unit changeably.

In addition, the 3rd scheme of the present invention is the printing equipment that has with lower unit, and linear drive unit is used to make print unit to move back and forth along certain orientation; Afterburning unit reverses, when print unit leans on the driving force of linear drive unit to move back and forth, near moving back and forth interval two ends, print unit is applied counter-rotating potential energy power, and has a control module, when the opposite driving force of counter-rotating potential energy power that makes the linear drive unit generation with the afterburning unit of counter-rotating, print unit is temporarily kept out of the way be not subjected to and reversed on the position of effect of potential energy power, thereafter, start under the situation of the print unit that is in halted state once more, when making this print unit keep out of the way stop position, variable control should offer the dutycycle of the drive current of linear drive unit.

In addition, the 4th scheme of the present invention is the printing equipment that has with lower unit, and linear drive unit is used to make print unit to move back and forth along certain orientation; Afterburning unit reverses, when print unit leans on the driving force of linear drive unit to move back and forth, near moving back and forth interval two ends, print unit is applied counter-rotating potential energy power, and has a control device, when the opposite driving force of counter-rotating potential energy power that makes the linear drive unit generation with the afterburning unit of counter-rotating, print unit is temporarily kept out of the way be not subjected to and reversed on the position of potential energy power effect, thereafter, start under the situation of the print unit that is in halted state once more, when making this print unit keep out of the way stop position, variable control should offer the value of the drive current of linear drive unit.

According to the example of the best, control module does not satisfy under the situation of ormal weight at the shift amount of print unit, carries out restarting of this print unit repeatedly.

According to another best example, control module is judged as stroke defect when the driving again of the print unit of stipulated number still gets nowhere repeatedly.

If adopt the of the present invention the 1st and the 2nd scheme, then make print unit keeping out of the way after once more under the situation of starting, make linear drive unit produce driving force print unit sent between the reversal zone that applies counter-rotating potential energy power from keeping out of the way stop position.At this moment, can change to linear drive unit input drive current according to running-active status and begin starting, or finish the moment of starting, perhaps, can change the value of the starting current that offer linear drive unit according to running-active status.Thereby, under the situation that makes print unit reverse continuously, keep out of the way, stop, starting, even because disperse relevant with the dynamic characteristic of the afterburning unit of counter-rotating, perhaps because the situation that the driving force of variations in temperature linear drive unit changes, also can carry out suitable control to linear drive unit according to that situation constantly, can begin to follow the printing that the moves back and forth action of print unit apace once more, can action stably under the state that does not reduce the print processing ability.

In addition,, then when print unit is temporarily kept out of the way, can change the dutycycle of the drive current that offer linear drive unit, perhaps can change the value of drive current according to running-active status according to running-active status if adopt the of the present invention the 3rd and the 4th scheme.Thereby, under the situation that makes print unit reverse continuously, keep out of the way, stop, starting, even because disperse relevant with the dynamic characteristic of the afterburning unit of counter-rotating, perhaps because the situation that the driving force of variations in temperature linear drive unit changes, also can carry out suitable control to linear drive unit according to that situation constantly, can begin to follow the printing that the moves back and forth action of print unit apace once more, can action stably under the state that does not reduce the print processing ability.

According to the 5th scheme of the present invention, can provide another printing equipment.This printing equipment comprises: linear drive unit is used to make print unit to move back and forth along certain orientation; The afterburning unit that reverses, above-mentioned print unit move back and forth interval two ends near print unit is applied counter-rotating potential energy power; Detecting unit is used to detect the position of above-mentioned print unit; Carry out following control above-mentioned near moving back and forth an interval end: counter-rotating control makes the moving direction counter-rotating of above-mentioned print unit by above-mentioned counter-rotating potential energy power; Keep out of the way control,, above-mentioned print unit is temporarily stopped near the target stop position by after above-mentioned counter-rotating, above-mentioned print unit being produced and the opposite brake force of above-mentioned counter-rotating potential energy power; Restart control, on an above-mentioned extreme direction, drive above-mentioned print unit in the above-mentioned control back of keeping out of the way.And, comprising current control unit, it is according to detected in the above-mentioned above-mentioned print unit position that moves back and forth in the interval by above-mentioned detecting unit, and variable control offers the electric current of above-mentioned linear drive unit.

It is desirable to, above-mentioned current control unit comprises the dutycycle control module, and it keeps out of the way the dutycycle that variable control in the control offers the electric current of above-mentioned linear drive unit above-mentioned.

It is desirable to, above-mentioned current control unit comprises the current value control module, and it keeps out of the way the value that variable control in the control offers the electric current of above-mentioned linear drive unit above-mentioned.

It is desirable to, above-mentioned current control unit comprises the dutycycle control module, and it restarts the dutycycle that variable control in the control offers the electric current of above-mentioned linear drive unit above-mentioned.

It is desirable to, above-mentioned current control unit comprises the current value control module, and it restarts the value that variable control in the control offers the electric current of above-mentioned linear drive unit above-mentioned.

It is desirable to, above-mentioned current control unit comprises control module constantly, and it is restarted the moment that variable control in the control finishes to provide to above-mentioned linear drive unit electric current above-mentioned.

It is desirable to, further comprise stop control unit, above-mentioned keep out of the way control after, before receiving print start signal, above-mentioned print unit is maintained near the above-mentioned target stop position.

It is desirable to, further comprise temperature measuring apparatus, above-mentioned current control unit is according to the environment temperature of being measured by temperature measuring apparatus, and variable control offers the electric current of above-mentioned linear drive unit.

As mentioned above, under the situation that makes print unit reverse continuously, keep out of the way, stop, starting to the control of linear drive unit, can not satisfy the number of times that puts rules into practice repeatedly under the situation of ormal weight at the shift amount of print unit, under can be in stipulated number, do not think malfunction and begin to follow the printing that the moves back and forth action of print unit as regular event once more the situation of print unit foldback ormal weight.

Other features and advantages of the present invention, the explanation of carrying out following embodiment by the reference accompanying drawing is just clearer.

Description of drawings

Fig. 1 as an embodiment of printing equipment of the present invention, is a skeleton diagram of showing its general structure.

Fig. 2 is a side view of seeing the state of linear electric machine from the side.

Fig. 3 is the top figure of state that sees the movable member of linear electric machine from above.

Fig. 4 is the block diagram that is built in the microcomputer in the printing equipment of the present embodiment.

Fig. 5 is the counter-rotating that is used to illustrate the present embodiment, the key diagram of keeping out of the way, stop, starting control.

Fig. 6 be show make print head assembly reverse, keep out of the way, stop, flow chart that an example of processing is controlled in the interruption when start.

Fig. 7 be show make print head assembly reverse, keep out of the way, stop, another routine flow chart that processing is controlled in the interruption when start.

Fig. 8 is used for illustrating the counter-rotating of in the past installing, the key diagram of keeping out of the way, stop, starting control.

Fig. 9 is the key diagram that is used to illustrate the action of the C part that is applicable to Fig. 8.

Figure 10 is the key diagram that is used to illustrate the action of the D part that is applicable to Fig. 8.

The specific embodiment

Below, specifically describe the embodiment of the best of the present invention with reference to accompanying drawing.

Fig. 1 as an embodiment of printing equipment of the present invention, is a skeleton diagram of showing its general structure.The invention is characterized in, under the situation that the print head assembly that makes in moving back and forth reverses, keeps out of the way, stops, starting,,, illustrate so omit aptly because machinery constitutes with identical in the past to the control of linear electric machine.

As shown in Figure 1, the formation of printing equipment possesses: move back and forth the print head assembly 1 as print unit that prints along Print direction S; Linear electric machine 2 as linear drive unit from driving force to print head assembly 1 that pay; In the driving force counter-rotating that makes linear electric machine 2, it is delivered to the belt pulley mechanism 3 of print head assembly 1; The fixed axis 4 that printhead support assembly 1 moves freely along print line direction S; Be directed inserting in this fixed axis 4, conduct applies a pair of elastomeric spring 5A, the 5B of the afterburning unit of counter-rotating of counter-rotating potential energy power when print head assembly 1 moves back and forth; The linear encoder 6 of detection position of print head assembly 1 in moving back and forth the interval etc.Have again, in printing equipment, except the mechanicalness composed component, be built-in with and be used for the microcomputer described later that ON/OFF control offers the drive current of linear electric machine 2, control the action of printing equipment integral body with this microcomputer.In addition, in printing equipment, be built-in with thermistor as inscape not shown in Fig. 1.

Fig. 2 is a side view of seeing the state of linear electric machine from the side, Fig. 3 is the top figure of state that sees the movable member of linear electric machine 2 from above, as shown in these figures, linear electric machine 2, roughly possess following formation: a pair of nonadjustable signal 2A, 2B, it is also integrated that a plurality of permanent magnet G... are arranged in a straight line; Movable member 2C is inserted between these nonadjustable signals 2A, the 2B, and a plurality of coil C... are installed.Movable member 2C, owing to generate the shifting magnetic field according to the drive current that flows through coil C..., this shifting magnetic field acts on the permanent magnet G on nonadjustable signal 2A, the 2B, thereby straight line moves between these nonadjustable signals 2A, 2B.In addition, on movable member 2C, particularly as shown in Figure 3, be provided with constant speed coil C1 that mainly when constant speed movement, is in "on" position and the counter-rotating coil C2 that mainly when changing moving direction, is in "on" position.The drive current that offers these coils C1, C2 is carried out FEEDBACK CONTROL as controlled quentity controlled variable, thus, and meanwhile movable member 2C repeatedly constant speed/return motion move back and forth.

Returning Fig. 1 again sees, such movable member 2C connects on the position through the close linear electric machine 2 of connecting rod 3B in the belt of belt pulley 3 mechanisms, on the other hand, print head assembly 1 is through connecting on the position of leaving linear electric machine 2 of connecting rod 3C in the belt of belt pulley 3.In addition, movable member 2C also directly is bound up on to be directed inserting through connecting rod 3A and is used for movable limit block 5C, 5D that elastomeric spring 5A, 5B are pushed or leave in the fixed axis 4.Thereby its formation is, print head assembly 1 is moving back and forth in the opposite direction with the side that moves back and forth of movable member 2C, and on the other hand, meanwhile movable limit block 5C, 5D move back and forth on equidirectional with movable member 2C.Therefore, movable member 2C has played the effect as balance weight of the print head assembly 1 that moves back and forth relatively.

And if then specifically describe, the printing equipment of the present embodiment then, be adopt point impact mode to the print paper (not shown) of continuous bill etc. implement to print device, in print head assembly 1, being that the state of matrix carries a plurality of syringe needles (not shown) along direction proper alignment with the paper feeding direction F quadrature of print paper.The formation of this print head assembly 1 is, when the print line direction S with the paper feeding direction F quadrature of print paper moves back and forth, carry out selectively going up the action that impacts out syringe needle to print paper from colour band (not shown), its result concentrates the printing of carrying out 1 row size.Such printing action is carried out when print head assembly 1 constant speed movement is moving back and forth in the interval, when print head assembly 1 counter-rotating is mobile, prints the paper feeding with paper.

That is to say that the interval that print head assembly 1 moves back and forth is divided into and occupies between its middle body prints action in constant speed movement print zone, and occupy and move back and forth interval two end portions is carried out the paper feeding action in the counter-rotating action paper feeding interval.On the other hand, between the reversal zone of the counter-rotating potential energy power effect that elastomeric spring 5A, 5B produce, occupy near the band interval two ends that moves back and forth that comprises the paper feeding interval, but because the counter-rotating potential energy power that these elastomeric springs 5A, 5B produce, even between print zone, also work, so be configured to interfere mutually part superposition between the reversal zone and between print zone.In such action that moves back and forth the print head assembly 1 in the interval, in the detailed action specification of back, narrate.

Fig. 4 is the block diagram that is built in the microcomputer in the printing equipment of the present embodiment, and as shown in this figure, microcomputer interconnects MPU10, ROM11, RAM12 with bus, and interface 13 and constituting.On interface 13, be connected with linear electric machine 2, linear encoder 6, and thermistor 7 etc.

MPU10 except the printing action undertaken by print head assembly 1 and paper feeding action etc., should offer the reciprocating action of drive current control print head assembly 1 of coil C1, the C2 of linear electric machine 2 by control.In MPU10, include: the current value control module of controlling the value of electric current changeably as this drive current control module; Control the dutycycle control module of the dutycycle of electric current changeably; Control the moment control module that be provided to coil C1, C2 the finish time of electric current changeably.In particular, MPU10, on the one hand drive current as controlled quentity controlled variable linear electric machine 2 as controlling object, on the other hand when print head assembly 1 moves back and forth, according to calculating the translational speed of print head assembly 1, carry out FEEDBACK CONTROL as the object variations amount with this translational speed by the detected one by one displacement of linear encoder 6.At this moment, MPU10, even when also in paper feeding interval, making print head assembly 1 counter-rotating between the reversal zone near two end portions and counter-rotating control the paper feeding action simultaneously.

On the other hand, when print head assembly 1 counter-rotating, be not limited to usually, have than the long paper feeding of common paper feeding length and do not send the situation of descending print order here with the certain-length paper feeding.At this moment, MPU10, make linear electric machine 2 produce the opposite driving force of counter-rotating potential energy power with elastomeric spring 5A, 5B, print head assembly 1 is kept out of the way reverse the inoperative position of potential energy power (this hereinafter referred to as " keeping out of the way stop position "), the state of being arranged to temporarily stop.Thereafter, the action that moves back and forth of starting print head assembly 1 once more according to the reception of the end of paper feeding action and print order, thus, MPU10 is even owing to also can begin to move back and forth action rapidly once more than the paper feeding of common paper feeding length length and the delay of print order.

ROM11, control program that store M PU10 should carry out and parameter etc.RAM12 is used as the uses such as operation area of MPU12.Interface 13 works as the input and output contact to MPU10.Linear encoder 6, except the output detection signal S1 corresponding with the displacement of print head assembly 1, also backward position detection signal S2, the S3 that print head assembly 1 arrives between the reversal zone represented in output.To the constant speed coil C1 of linear electric machine 2, provide constant speed drive current D1 on the one hand,, provide counter-rotating drive current D2 on the other hand to counter-rotating coil C2.The environment temperature of thermistor 7 checkout gear inside transmits it to MPU10.

Microcomputer with this formation, it moves in detail and narrates in the explanation of back, but paper feeding and the print order longer than common paper feeding in correspondence postpone, make under the situation that print head assembly 1 reverses, keeps out of the way, stops, starting, even if disperse relevant with the dynamic characteristic of elastomeric spring 5A, 5B arranged, and the driving force that depends on the linear electric machine 2 of variations in temperature changes, also can print head assembly 1 accurately be moved according to that situation constantly suitably changing constantly and controlling linear electric machine 2 in the controlled quentity controlled variable.

Fig. 5 is the counter-rotating that is used for illustrating the present embodiment, the key diagram of keeping out of the way, stop, starting control.Part shown in the symbol A of this figure is such, under the situation of carrying out every line printing action continuously, print head assembly 1 between print zone to move between the reversal zone and conversion direction after, from between another reversal zone, moving between the process print zone once more between the reversal zone, print action by so repeatedly action while moving back and forth, at this moment, even also be to enter in the paper feeding interval of acceleration and deceleration state between the reversal zone, among being in counter-rotating, print head assembly 1 carries out the paper feeding action in counter-rotating potential energy power according to elastomeric spring 5A, 5B.

On the other hand, part shown in the symbol B of Fig. 5 is such, under the situation that the print head assembly 1 that makes in moving back and forth reverses, keeps out of the way, stops, starting, MPU10, the inoperative retreating position of counter-rotating potential energy power that stops at elastomeric spring 5A, 5B for print head assembly 1 is temporarily kept out of the way, linear electric machine 2 is produced and the opposite driving force of counter-rotating potential energy power, and the print head assembly 1 in reversing is with brake force (E).So print head assembly 1 is in the state (F) of keeping out of the way stop position that rests in the paper feeding action with before receiving the next line print order.Thereafter, if paper feeding release and receive print order, that then starts print head assembly once more moves back and forth action (G).At this moment, linear electric machine 2, in order to produce therewith corresponding driving force, make print head assembly 1 is returned to elastomeric spring 5A, 5B to apply the paper feeding of strong relatively counter-rotating potential energy power interval and control the drive current that offer coil C1, C2 from keeping out of the way stop position.

If adopt above-mentioned a series of control sequence, can stably reverse, keep out of the way, stop, starting print head assembly 1, can make it carry out regular event.,, perhaps cause heating to install the temperature inside rising, cause under the driving force variation state greatly of linear electric machine 2, produce bad phenomenon shown in Figure 8 as mentioned above owing to turning round continuously because the dynamic characteristic existence of elastomeric spring 5A, 5B is dispersed.In the present embodiment, it is the situation that makes print head assembly 1 reverse continuously, keep out of the way, stop, starting, make print head assembly 1 in moving back and forth keep out of the way after paper feeding release and receive print order, when starting once more in view of the above, change the moment of linear electric machine 2 input drive currents being started beginning according to situation, perhaps moment of proceed-to-send, variable control is returned to moment in paper feeding interval to print head assembly 1 from keeping out of the way halted state.In addition, with variable control constantly in, perhaps as independently controlling, print head assembly is returned to paper feeding when interval from keeping out of the way stop position with it, should offer the value of the drive current of linear electric machine 2 according to the situation control break.

In addition, even when print head assembly 1 in moving back and forth is temporarily kept out of the way, by change the dutycycle of the drive current offer linear electric machine 2 according to situation, the perhaps value of this drive current, the stop position This move of keeping out of the way that makes print head assembly 1 rest on regulation becomes stable.

And then even if control as described above is being arranged, print head assembly 1 does not turn back under the situation in paper feeding interval yet fully, can not make moving the becoming along normal rate curve action that move back and forth thereafter.In this case, have more than with 1 time and just be judged as stroke defect, but as trying to move repeatedly the same control of stipulated number execution again, when making under the situation that print head assembly 1 turns back to the paper feeding interval with interior, can handle as normal action not as stroke defect at stipulated number.If adopt this method, just can avoid the counter-rotating of following print head assembly 1, the stroke defect of keeping out of the way, stop, starting as far as possible.

Below, mainly make that print head assembly 1 reverses, keeps out of the way, stops, control action when starting with reference to flowchart text.

Fig. 6 be show make print head assembly 1 reverse, keep out of the way, stop, flow chart that an example of processing is controlled in the interruption when start.This interrupts control handles, under the situation of paper feeding amount than common paper feeding length length, with carry out under the situation that can not begin to print action in moving back and forth action because the print order of next line postpones, be used for state that print head assembly 1 is arranged to temporarily stop from the state that moves back and forth processing.In addition, the position of the print head assembly 1 in moving back and forth the interval is detected one by one through linear encoder 6.

At first, MPU10 is when accepting interrupt instruction, and the control of reversing makes print head assembly 1 in moving back and forth from moving to the paper feeding interval between print zone, again from the paper feeding interval after the direction conversion towards between print zone (S1).This control of reversing, the drive current that offers linear electric machine 2 by control suitably carries out, and is before the E part shown in Figure 5, preceding half corresponding with the B part.Have again, control paper feeding simultaneously in reverse when control and this control and move.

Thus, if print head assembly 1 moves between print zone from the interval beginning of paper feeding, then MPU10 begins to keep out of the way control (S2).Why carrying out this and keep out of the way control, is for corresponding with the E of Fig. 5 part, makes linear electric machine 2 produce the opposite driving force of counter-rotating potential energy power with elastomeric spring 5A, 5B, to the print head assembly 1 in reversing with brake force.Keep out of the way control if carry out this fully, then print head assembly 1 is in the state that temporarily stops of moment in keeping out of the way on the stop position shown in the chain-dotted line of Fig. 5.This F part with Fig. 5 is corresponding.

Keep out of the way after control just begun from this, MPU10 monitors whether become the paper feeding action that begins to interrupt to control the reason of processing finishes (S3) fully.Have again, when the reason that begins to interrupt to control processing is that MPU10 monitors whether receive this print order under the print order situation about postponing.

Keep out of the way control just begun after in, finish fully if detect paper feeding action, when perhaps receiving the print order of delay (S3:YES), MPU10 begins to restart control (S4) for printhead assembly 1 is moved back and forth once more.Why restart control, be for printhead assembly 1 from keeping out of the way stop position, be returned to the interval of the counter-rotating potential energy power that applies strong elastomeric spring 5A, 5B relatively, while print head assembly 1 constant speed movement is pushed between print zone, this G part with Fig. 5 is corresponding by this reaction force.

At this moment, depend on the state after just keeping out of the way, the state that does not stop fully from print head assembly 1 begins to restart the situation of control in addition, in addition, elastomeric spring 5A, 5B's is discrete, with owing to move back and forth action the device temperature inside risen continuously before this, might produce the situation that can not from linear electric machine 2, obtain sufficient driving force.Therefore, MPU10 is according to the position of passing through the detected one by one print head assembly 1 of linear encoder 6 and pass through thermistor 7 detected temperature etc., controls to change the moment (S5) that finishes to restart control.Restarting control regularly as finishing, for example, is that benchmark changes to 30ms etc. from 20ms with the moment of restarting beginning.Have again, in this case, also can change the current value of the drive current that offers linear electric machine 2.Thus, linear electric machine 2 is produced make to break away between print zone, just in time reach the driving force in paper feeding interval reliably at the print head assembly 1 of keeping out of the way stop position.

After control was restarted in execution as described above, MPU10 confirmed whether print head assembly 1 has broken away from arrival paper feeding interval (S6) between print zone.

When print head assembly 1 has broken away under the situation between print zone (S6:YES), MPU10 finishes this interruption control and handles and turn back to original processing that moves back and forth action.Thus, Yi Bian print head assembly 1 begins to print action once more by driving force one side constant speed movement between print zone that linear electric machine 2 produces.

On the other hand, in S6, restart control print head assembly 1 is broken away under the situation between print zone (S6:NO) when providing, MPU10, reaching stipulated number trying number of times again, for example is (S7:NO) before 4 times in the present embodiment, returns S4 in order to restart control repeatedly.

In S7, reach stipulated number (S7:YES) if try number of times again, MPU10, being judged as is the stroke defect (S8) that can not recover normal action, then finishes this interruption control and handle after the notice of carrying out this meaning.

In S3, to keep out of the way after control just begun, the paper feeding action finishes, and does not perhaps also receive under the situation of print order of delay (S3:NO), and MPU10 stops control (S9).This stops control and is meant that as previously mentioned, print head assembly 1 rests on the control of the state of keeping out of the way stop position.

Thereafter, MPU10 is the same with S3, finishes fully if detect paper feeding action, when perhaps receiving the print order of delay (S10:YES), restarts control back (S11) having carried out, and enters S6.

In S10, when paper feeding action finishes, when perhaps also not receiving the print order of delay (S10:NO), MPU10 returns the control that stops of S9.

Fig. 9 is the key diagram that is used to illustrate the action of the C part that is applicable to Fig. 8, if conclude with reference to this Fig. 9, then shown in the C part, if detect the position of R2 then produce the right hand edge signal from linear encoder 6.So MPU10 enters the control of keeping out of the way action (E), only produce reciprocal power at the interval 2 pairs of print head assemblies of linear electric machine 1 that drive of E.Originally, make even in the weighing apparatus at the stop position of keeping out of the way of R3 that print head assembly 1 is stopped is desirable, but since above-mentioned reason break bounds because of the effect of elastomeric spring 5A, 5B sometimes at print head assembly 1 before the position of R4.Distance between R3 and R4, also the environment owing to mechanical condition and temperature etc. changes.

Then, in the stopping period (F) before printing beginning, drive constant speed coil C1, print head assembly 1 is moved towards the R3 position that contact with spring 5A, 5B, but little thereby can not arrive the R3 position because of the thrust of constant speed coil C1 generation at once.If begin to restart (G) when no show R3 position, then print head assembly 1 moves with the such movement locus of curve C r, and the distance (H) that breaks away from from R2-R2 between print zone shortens, and produces print quality and worsen in interval J.

Thereby according to the positional information of the print head assembly 1 that obtains from linear encoder 6, MPU10 prolongs the concluding time of the timing action of restarting (G), this is regularly moved be arranged to (G ') shown in Figure 9.Perhaps, the timing action of restarting is constant as (G), and increases the drive current that offers linear electric machine 2.Perhaps, implement this two aspect.So control linear electric machine 2, make to prolong to break away from distance (H), before the position of R1, print head assembly 1 is returned, so, the track of print head assembly 1 becomes the track shown in double dot dash line Cr ', can prevent the velocity variations of the print head assembly among the R2-R2 1 between print zone.

Thereby, if adopt the printing equipment that reverses, keeps out of the way, stops, starting control according to order shown in Figure 6, even then because relevant with the dynamic characteristic of elastomeric spring 5A, 5B discrete, under the situation about descending with the driving force of reason linear electric machine 2 such as temperature rising, also can carry out suitable control to linear electric machine 2 according to the situation of this moment, can begin to follow the printing that the moves back and forth action of print head assembly 1 apace once more and can not reduce the print processing ability, can stably reverse, keep out of the way, stop, starting this a succession of action.

Below, with reference to flow chart another embodiment is described simply.

Fig. 7 is a flow chart of showing another example make the interruption processing under the situation that print head assembly 1 reverse, keeps out of the way, stops, starting.A series of control sequence shown in Figure 7, except the S21 shown in the flow chart of Fig. 7 and Fig. 6 identical, and with the step number representation identical with Fig. 6.Unique difference is to be provided with S21, and below to put with this be that the center describes.

In step S3, finish fully when keeping out of the way the moment paper feeding action of control after just having begun, when perhaps receiving the print order of delay (S3:YES), in this case, also might produce dispersing owing to elastomeric spring 5A, 5B, with because the continuous before this movement device temperature inside that moves back and forth rises, can not obtain the situation of enough driving forces from linear electric machine 2.Therefore, MPU10 is according to the position through the detected one by one print head assembly 1 of linear encoder 6, with through thermistor 7 detected temperature etc., control and change the dutycycle (S21) that when the beginning that stops to control, offers the drive current of linear electric machine 2.The dutycycle of so-called drive current is the ratio of the number of drive pulses in time per unit, for example changes to 70% from 50%.Have again, in this case, also can change the current value of the drive current that offers linear electric machine 2.Thus, linear electric machine 2 is produced make print head assembly 1 to move closer to and rest on the driving force on the stop position of keeping out of the way of regulation.Thereafter, MPU10 enters S4.

Figure 10 is the key diagram that is used to illustrate the action of the D part that is applicable to Fig. 8, if conclude with reference to this Figure 10, then shown in the D part, when just having moved to when stopping (F) print head assembly 1 having exceeded target stop position (R3) significantly afterwards from keeping out of the way (E), even directly restart (G), also R2-R2 produces mistake between print zone owing to print head assembly 1 can not break away from.

In this case, not only make the moment of restarting end variable, and in order to suppress the overshoot position of print head assembly 1 as far as possible, MPU10 is controlled at changeably and stops the dutycycle that when beginning control (F) offers the drive current of constant speed coil C1, makes to make print head assembly 1 near target stop position (R3) at least.And, by carrying out and the above-mentioned identical control of the content that partly illustrates about C shown in Figure 9, just can avoid can not breaking away from the mistake that produces from R2-R2 between print zone because of print head assembly 1.

In addition, even also be not judged as mistake immediately, but mistake is suppressed at minimum by carrying out retry control once more from the disengaging failure of R2-R2 between print zone.

Thereby, reverse with order shown in Figure 7 if adopt, keep out of the way, stop, the printing equipment of starting, even then be in owing to keeping out of the way when control and elastomeric spring 5A, what the dynamic characteristic of 5B was relevant disperses, and the temperature rising etc., the state that the driving force of linear electric machine 2 descends, also can carry out suitable control to linear electric machine 2 according to the state of this moment, print head assembly 1 follow the printing action that moves back and forth since keep out of the way control stop after, can promptly start working again and do not make the print processing ability drop, can stably reverse, keep out of the way, stop, start this a succession of action.

Have, the present invention has more than and is limited to above-mentioned embodiment again.

For example, as printing type, can also be applicable to the inkjet printing mode that is not limited to click printing type.

Unit as being used to print head assembly is moved back and forth is not limited to linear electric machine, if make the unit of print head assembly linear reciprocating motion by FEEDBACK CONTROL, also can be the motor of common rotating manner.

As mentioned above, if employing the present invention, then for example under the situation that makes print head assembly reverse continuously, keep out of the way, stop, starting, even because disperse relevant with the dynamic characteristic of elastomeric spring, and variations in temperature, under the situation of the driving force change of linear electric machine, also can carry out suitable control to linear electric machine according to the situation of this moment, can promptly begin to follow the printing that the moves back and forth action of print head assembly once more, can make action stable and do not make the print processing ability drop.

Claims (10)

1. printing equipment, comprise the linear electric machine that print unit is moved back and forth along certain orientation, and near the interval two ends of moving back and forth of above-mentioned print unit, print unit applied the afterburning unit of counter-rotating potential energy power and be used to detect the detecting unit of the position of above-mentioned print unit; Move back and forth near the interval end above-mentioned, carry out following control, counter-rotating control makes the moving direction counter-rotating of above-mentioned print unit by above-mentioned counter-rotating potential energy power; Keep out of the way control, by after above-mentioned counter-rotating to above-mentioned print unit effect and the opposite brake force of above-mentioned counter-rotating potential energy power, above-mentioned print unit is temporarily stopped near the target stop position; Restart control, be used for driving above-mentioned print unit in the above-mentioned control back of keeping out of the way to an above-mentioned extreme direction, this printing equipment is characterised in that:

Comprise current control unit, it controls the electric current that offers above-mentioned linear drive unit, wherein changeably according to by the detected above-mentioned position that moves back and forth the above-mentioned print unit in the interval of above-mentioned detecting unit

From the backward position of above-mentioned print unit above-mentioned target stop position is set with leaving.

2. printing equipment as claimed in claim 1 is characterized in that above-mentioned current control unit comprises the dutycycle control module, and it is used for keeping out of the way the dutycycle that the electric current that offers above-mentioned linear drive unit is controlled in control changeably above-mentioned.

3. printing equipment as claimed in claim 1 is characterized in that above-mentioned current control unit comprises the current value control module, and it is used for keeping out of the way the value that the electric current that offers above-mentioned linear drive unit is controlled in control changeably above-mentioned.

4. printing equipment as claimed in claim 1 is characterized in that above-mentioned current control unit comprises the dutycycle control module, and it is used for restarting the dutycycle that the electric current that offers above-mentioned linear drive unit is controlled in control changeably above-mentioned.

5. printing equipment as claimed in claim 1 is characterized in that above-mentioned current control unit comprises the current value control module, and it is used for restarting the value that the electric current that offers above-mentioned linear drive unit is controlled in control changeably above-mentioned.

6. printing equipment as claimed in claim 1 is characterized in that above-mentioned current control unit comprises timing control unit, and it is used for restarting the timing that the electric current that finishes to offer above-mentioned linear drive unit is controlled in control changeably above-mentioned.

7. printing equipment as claimed in claim 1 is characterized in that, further comprises stop control unit, it above-mentioned keep out of the way control after, before receiving print start signal, keep above-mentioned print unit near above-mentioned target stop position.

8. printing equipment as claimed in claim 1 is characterized in that, further comprises temperature measuring apparatus, and above-mentioned current control unit is according to the environment temperature of being measured by this temperature measuring apparatus, and control offers the electric current of above-mentioned linear drive unit changeably.

9. printing equipment as claimed in claim 1 is characterized in that, above-mentioned control module when the shift amount of above-mentioned print unit does not satisfy ormal weight, is carried out restarting of this print unit repeatedly.

10. printing equipment as claimed in claim 9 is characterized in that, above-mentioned control module when restarting still of the above-mentioned print unit of stipulated number repeatedly can not success, is judged as stroke defect.

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