CN110614849A - Improved ink droplet charging-based small character spray head jet printing method - Google Patents
Improved ink droplet charging-based small character spray head jet printing method Download PDFInfo
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- CN110614849A CN110614849A CN201910869022.4A CN201910869022A CN110614849A CN 110614849 A CN110614849 A CN 110614849A CN 201910869022 A CN201910869022 A CN 201910869022A CN 110614849 A CN110614849 A CN 110614849A
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- Prior art keywords
- ink
- charging
- small character
- ink drops
- drops
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/11—Ink jet characterised by jet control for ink spray
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
- B41J2/185—Ink-collectors; Ink-catchers
Abstract
The invention relates to the technical field of small character code spraying machines, in particular to a small character spray head spray printing method based on improved ink droplet charging; the method comprises the following steps: s1, electrifying and initializing the ink jet printer, ejecting ink drops through the small character nozzle, and charging the ink drops; s2 arranging the charged ink drops according to the required sequence; s3, judging whether the charge quantity of the charged ink drop meets the preset requirement; s4, if the charge quantity in S3 does not meet the requirement, returning to S1 for recharging; if the requirement is met, the step is S5; and S5, enabling the ink drops to participate in jet printing, splicing the landing positions of the ink drops to enable the landing positions of the ink drops to reach the expected positions, and finishing the jet printing. The invention solves the problems that ink drops are difficult to be printed on a straight line and the deviation of the ink drops causes the typing skew in the prior art, and improves the accuracy; the ink drop which does not satisfy the charge quantity is recovered and injected into the ink tank again to participate in the printing operation process again, so that the ink loss can be reduced, and the ink utilization rate is improved.
Description
Technical Field
The invention relates to the technical field of small character code spraying machines, in particular to a small character spray head spray printing method based on improved ink droplet charging.
Background
At present, the charging end of the small character code spraying machine mainly applies certain pressure to ink in a system by controlling an internal gear pump or supplying compressed gas from the outside of the machine, so that the ink is ejected through a nozzle with the aperture of dozens of microns. The continuous ink line formed by jetting from the nozzle is split into ink drops with equal size and certain spacing under the action of the vertical vibration of the crystal driving rod in the spraying cavity, and then the ink drops are respectively electrified by induction when passing through the charging electrode; detecting whether the actually charged quantity of the ink drops is correct or not by the electrostatic ink drops through the detection electrode; finally, the charged ink drops are deflected in a high-voltage deflection electric field, are ejected from a spray head and are respectively sprayed on different positions of the surface of a product to form various required marks such as characters, patterns and the like. And the ink drops which are not charged are driven into the recovery tank and enter an ink circulation system in the machine again. Fig. 2 is a schematic structural diagram of a nozzle in a continuous inkjet printer system, and the principle of the inkjet printer can be fully seen through the structure of the nozzle.
As shown in fig. 3, when the gravity mg of the charged ink droplet is neglected, and v ≠ E, the motion trajectory of the ink droplet in the high-voltage deflection field makes a cumulative-horizontal-throw motion in the electric field. The charged particles are acted on by coulomb force only in the horizontal direction and move with a uniform velocity at an acceleration of a = Eq/m.
The charged ink drop does uniform linear motion in the direction vertical to the direction of the electric field, and then corresponds to displacement in the vertical direction: x = vt; and (3) making a uniform addition linear motion with an initial speed of 0 in the horizontal direction, and corresponding to the displacement in the horizontal direction: y = at/2, called side-shifting. Due to the influence of coulomb force between two adjacent charged particles. The specific direction is shown in FIG. 4, and the size is
Wherein: is a constant number q1And q is2Respectively, the amount of charge carried by the ink droplets, d the distance between two ink droplets, and F the magnitude of the coulomb force, i.e., the magnitude of the repulsive force, and thusThe cause and magnitude of the lateral shift are reflected.
Because all the ink drops have the same charge, two ink drops have repulsive force, the ink drops at the back can deviate from the original track and cannot land at a specified place, and according to a formula, the larger the charge quantity of two adjacent ink drop strips is, the larger the repulsive force (coulomb force) is, and the larger the position deviation is. It is easier to deform the font.
As shown in fig. 5, the left blank circle is the position of the ink drop jet printing of the second period, but in order to be spliced with the first period, the ink drop in the second period is recovered, and the ink drop in the third period participates in the jet printing, so that the splicing is completed.
In view of the above technical drawbacks, the present application provides a method for inkjet printing with a small character nozzle based on improved ink droplet charging.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses an improved ink droplet charging small character spray head jet printing method, aiming at reducing the influence of coulomb force on adjacent ink droplets so that the ink droplets can be jet printed on a preset position with as little or no deviation as possible. Thereby further improving the jet printing effect and improving the jet printing quality.
The invention is realized by the following technical scheme:
a method for small character spray printing based on improved ink droplet charging, the method comprising the steps of:
s1, electrifying and initializing the ink jet printer, ejecting ink drops through the small character nozzle, and charging the ink drops;
s2 arranging the charged ink drops according to the required sequence;
s3, judging whether the charge quantity of the charged ink drop meets the preset requirement;
s4, if the charge quantity in S3 does not meet the requirement, returning to S1 for recharging; if the requirement is met, the step is S5;
and S5, enabling the ink drops to participate in jet printing, splicing the landing positions of the ink drops to enable the landing positions of the ink drops to reach the expected positions, and finishing the jet printing.
Further, the ink droplets are sequentially charged in a preset charging order.
Further, the first 16 charging sequences are 400mC, 100mC, 380mC, 120mC, 360mC, 140mC, 340mC, 160mC, 320mC, 180mC, 300mC, 200mC, 280mC, 220mC, 260mC, and 240 m.
Further, the first 16 sequential drops enter charging, the entire alignment cycle is complete, and the next print repeats the alignment.
Further, when a cycle is completed, a new drop is entered, and the next cycle is repeated.
Further, in S5, when the ink droplets enter the deflecting electric field during printing, the order of the magnitudes of the deflecting electric fields is modified according to the order of the charging electric fields, so that the ink droplets land on the landing positions one by one.
Furthermore, the actual size of the deflection electric field is calculated as 400mC, and when the second droplet 100mC enters the deflection electric field, the deflection electric field is calculated as 100 mC.
Furthermore, a delay period is set, and 16 drops of ink with unqualified charge amount directly enter a recovery device without participating in jet printing.
The invention has the beneficial effects that:
the invention solves the problems that ink drops are difficult to be printed on a straight line and the deviation of the ink drops causes the typing skew in the prior art, and improves the accuracy; the ink drop which does not satisfy the charge quantity is recovered and injected into the ink tank again, and participates in the printing operation process again, so that the ink loss can be reduced, the ink utilization rate is improved, and the ink tank has a very strong market application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for small character jet printing based on improved ink drop charging;
FIG. 2 is a structural view of a head of the background art of the present invention;
FIG. 3 is a graph of ink droplet motion in a high pressure deflection field according to the background of the invention;
FIG. 4 is a diagram illustrating the coulomb force interaction between charged ink droplets according to the background of the present invention;
FIG. 5 is a comparison of an ink path that is idle for one period (solid) versus not idle for one period (open) in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The present embodiment discloses a flow chart of a method for jet printing based on an improved ink droplet charging small character jet head as shown in fig. 1, and the present embodiment mainly follows two physical laws of universal gravitation law and charged particle deflection in an electric field. Before the invention, the small character code spraying machine nozzles are mainly used for dotting in sequence. The difference between adjacent ink drops and the expected value may be too large, and the software and hardware are difficult to adjust. In order to avoid the drop position of the ink drop from exceeding the expected value. We re-order the drop order of the drops. The mutual interference among the ink drops is small, and the landing positions of the ink drops are in accordance with the expectation.
The embodiment discloses a small character spray printing method based on improved ink droplet charging, which comprises the following steps:
s1, electrifying and initializing the ink jet printer, ejecting ink drops through the small character nozzle, and charging the ink drops;
s2 arranging the charged ink drops according to the required sequence;
s3, judging whether the charge quantity of the charged ink drop meets the preset requirement;
s4, if the charge quantity in S3 does not meet the requirement, returning to S1 for recharging; if the requirement is met, the step is S5;
and S5, enabling the ink drops to participate in jet printing, splicing the landing positions of the ink drops to enable the landing positions of the ink drops to reach the expected positions, and finishing the jet printing.
And sequentially charging the ink drops according to a preset charging sequence. The first 16 charging sequences are 400mC, 100mC, 380mC, 120mC, 360mC, 140mC, 340mC, 160mC, 320mC, 180mC, 300mC, 200mC, 280mC, 220mC, 260mC, and 240 m.
The first 16 sequential drops enter charge, the entire alignment cycle is complete and the next print repeats the alignment. When one cycle is completed, a new drop is entered next, and the next cycle is repeated.
When ink drops enter a deflection electric field during printing, the sequence of the magnitude of the deflection electric field is modified according to the sequence of the charging electric field, so that the ink drops are in one-to-one correspondence to fall on the falling positions. The actual size of the deflection electric field is calculated as 400mC, and when the second droplet 100mC enters the deflection electric field, the deflection electric field is calculated as 100 mC.
And a delay period is set, and 16 drops of ink with unqualified charge amount directly enter a recovery device without participating in jet printing.
The amount of charge charged to each drop is selected to directly affect the amount of coulomb force experienced by the drop. The ordering of the ink drops determines the magnitude of coulomb force between every two ink drops, which is not only guaranteed to be as small as possible, but also guaranteed to be equal to the magnitude of coulomb force between every two ink drops, so that the offset is equal to the magnitude of coulomb force.
Example 2
In the embodiment, the charged ink droplets are mainly rearranged, so that the coulomb force existing between two adjacent ink droplets is reduced, the offset of the charged ink droplets is as small as possible, and the landing precision of the ink droplets is improved. In the conventional scheme, the first 16 ink drops are charged with 400mC, 380mC, 360mC, 340mC, 320mC, 300mC, 280mC, 260mC, 240mC, 220mC, 200mC, 180mC, 160mC, 140mC, 120mC and 100mC (the charging amount of the next ink drop is also arranged). However, this results in a large coulomb force on the front side ink drop and a small coulomb force on the rear side. In this algorithm, we first charge the ink droplets sequentially, but the order of charging (first 16) is 400mC, 100mC, 380mC, 120mC, 360mC, 140mC, 340mC, 160mC, 320mC, 180mC, 300mC, 200mC, 280mC, 220mC, 260mC, 240 m. Since the coulomb force experienced by the individual drops does not differ significantly (compared to the previous arrangement) when arranged in this manner, the impact on the drop entering the deflection field is less, and the jet printing position is more accurate.
When 16 drops enter, at which point the entire alignment cycle is complete, the next print repeats the alignment again. The charging sequence is changed, the interaction force (coulomb) among the ink drops is reduced, and when the ink drops enter the deflection electric field, in order to make the ink drops still hit the original position, the sequence of the deflection electric field is also modified according to the sequence of the charging electric field, so that the ink drops are in one-to-one correspondence, namely fall on the falling position. Specifically, it can be understood that when the first droplet 400mC passes through the charging field and then enters the deflecting field, the actual size of the deflecting field is calculated as 400mC, and when the second droplet 100mC enters the deflecting field, the actual size of the deflecting field should be calculated as 100mC instead of 380mC (the specific size needs to be determined according to the content of the ink jet print)
It is noted that when a cycle is complete (16 drops), a new drop enters immediately. At this time, the ink drop is discontinuous because 400mC is restored to the initial position of the first period, and the actual position is closer to the 1 st ink drop than the required position. In order to ensure the continuity of ink drops, a delay period is set on an algorithm, namely, the next 16 ink drops directly enter a recovery device and do not participate in jet printing, so that the continuity is achieved.
The invention solves the problems that ink drops are difficult to be printed on a straight line and the deviation of the ink drops causes the typing skew in the prior art, and improves the accuracy; the ink drop which does not satisfy the charge quantity is recovered and injected into the ink tank again, and participates in the printing operation process again, so that the ink loss can be reduced, the ink utilization rate is improved, and the ink tank has a very strong market application prospect.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for small character spray printing based on improved ink droplet charging, the method comprising the steps of:
s1, electrifying and initializing the ink jet printer, ejecting ink drops through the small character nozzle, and charging the ink drops;
s2 arranging the charged ink drops according to the required sequence;
s3, judging whether the charge quantity of the charged ink drop meets the preset requirement;
s4, if the charge quantity in S3 does not meet the requirement, returning to S1 for recharging; if the requirement is met, the step is S5;
and S5, enabling the ink drops to participate in jet printing, splicing the landing positions of the ink drops to enable the landing positions of the ink drops to reach the expected positions, and finishing the jet printing.
2. The improved ink droplet charging small character nozzle jet printing method according to claim 1, wherein in the step S1, the ink droplets are sequentially charged according to a preset charging sequence.
3. The improved ink drop charging small character nozzle jet printing method according to claim 2, wherein the first 16 charging orders are 400mC, 100mC, 380mC, 120mC, 360mC, 140mC, 340mC, 160mC, 320mC, 180mC, 300mC, 200mC, 280mC, 220mC, 260mC, 240 m.
4. The improved drop charging small character nozzle printing method according to claim 3, wherein when the first 16 sequential drops enter charging, the whole arranging period is completed, and the next printing is repeated again.
5. The improved drop charging small character spray printing method according to claim 4, wherein when one cycle is completed, the next cycle is repeated immediately after the new ink drop enters.
6. The improved method for ink droplet charging and small character spray printing according to claim 1, wherein in step S5, when the ink droplets enter the deflecting electric field during printing, the order of the deflecting electric field is modified according to the order of the charging electric field, so that the ink droplets land on the landing position.
7. The improved ink drop charging small character nozzle jet printing method according to claim 6, wherein the actual size of the deflection electric field is calculated in a way of 400mC, and when the second drop 100mC enters the deflection electric field, the deflection electric field is calculated in a way of 100 mC.
8. The improved ink droplet charging small character spray printing method according to claim 1, wherein a delay period is set, and 16 ink droplets with unqualified charge amount directly enter a recovery device without participating in spray printing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111791590A (en) * | 2020-07-23 | 2020-10-20 | 武汉先同科技有限公司 | Frequency conversion separation algorithm for small character spray heads |
| CN112319047A (en) * | 2020-09-18 | 2021-02-05 | 季华实验室 | Ink drop landing navigation system and ink-jet printing equipment |
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| CN112319047A (en) * | 2020-09-18 | 2021-02-05 | 季华实验室 | Ink drop landing navigation system and ink-jet printing equipment |
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| CN110614849B (en) | 2020-12-01 |
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Address after: No. 02, 5 / F, block 7, Fenghuang Industrial Park, No. 52, Liufang Avenue, fozuling street, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee after: Wuhan Xiantong Technology Co.,Ltd. Address before: No. 02, 5 / F, block 7, Fenghuang Industrial Park, No. 52, Liufang Avenue, fozuling street, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee before: WUHAN XIANTONG TECHNOLOGY Co.,Ltd. |
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