CN110757954A - Spray head, ink jet printer and ink jet printing method - Google Patents
Spray head, ink jet printer and ink jet printing method Download PDFInfo
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- CN110757954A CN110757954A CN201911054621.7A CN201911054621A CN110757954A CN 110757954 A CN110757954 A CN 110757954A CN 201911054621 A CN201911054621 A CN 201911054621A CN 110757954 A CN110757954 A CN 110757954A
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- 239000007921 spray Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007641 inkjet printing Methods 0.000 title claims description 16
- 238000007639 printing Methods 0.000 claims abstract description 43
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000013078 crystal Substances 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 abstract description 15
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 239000000976 ink Substances 0.000 description 220
- 230000005684 electric field Effects 0.000 description 12
- 230000010355 oscillation Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
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- 238000004064 recycling Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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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
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
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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
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
Abstract
The invention relates to a spray head, an ink-jet printer and an ink-jet method. The charging voltage of the charging plate is a fixed value, and a first ink line channel for ink droplets to pass through is formed in the charging plate. Each set of deflection plates includes a positive plate and a negative plate disposed face-to-face with a gap therebetween for forming a second ink line through which ink drops pass. The second ink lines of the deflection plates are communicated. The deflection plate is disposed adjacent to the charging plate, and the second ink line and the first ink line communicate with a movement passage for forming ink droplets. The charging voltage of the charging plate is a fixed value, so that the charged quantity of all the single ink drops passing through the charging plate has the same electric charge quantity, the charging plate can be always in a power-on state in the code spraying process, and the ink drops are continuously charged, so that the spraying and printing speed of the code spraying machine is not limited, and the service life of the charging plate is prolonged.
Description
Technical Field
The invention relates to the technical field of code spraying, in particular to a spray head, an ink-jet printer and a code spraying method.
Background
The code spraying machine is one non-contact product marking apparatus, and includes nozzle, ink path system, electronic system, casing and other structure. The nozzle prints high-quality characters in a dot matrix mode, is a main part for printing information, and can meet special requirements of different industries. The shower nozzle of prior art forms the ink droplet through the china ink chamber with the ink line split, and the ink droplet takes the electric quantity through the charging panel, and electrified ink droplet gets into between two deflection plates that set up relatively, takes place to deflect under the effect of electric field power, passes on the ink outlet falls into the product, and the required sign of printing out is removed to the cooperation product, and uncharged ink droplet gets into the recovery tube and recycles.
The traditional spray head of the ink-jet printer has the following defects: when the ink drops are charged by the charging plate, the falling interval of each ink drop is required to be larger than or equal to the charging time for the charging plate to charge the ink drop to the maximum charging amount, so that the jet printing speed of the ink jet printing machine is limited. Secondly, in the process of jet printing, the charging plate needs to be continuously subjected to the process of 'opening → charging → closing' for different time lengths, and the operation is harmful to the workload and the service life of the charging plate.
Disclosure of Invention
Therefore, it is necessary to provide a spray head and an inkjet printer for solving the above technical problems, so as to reduce the limitation on the spray printing speed of the inkjet printer, reduce the workload of the charging plate, and prolong the service life of the charging plate.
A spray head, comprising:
a charging plate provided with a first ink line for passage of an ink droplet;
the deflection plates in each group comprise a positive plate and a negative plate, the positive plate and the negative plate are arranged in a face-to-face mode, a gap is reserved between the positive plate and the negative plate, and the gap is used for forming a second ink line for ink droplets to pass through; the second ink lines of the deflection plates of the plurality of groups are communicated; the deflection plate is disposed adjacent to the charging plate, and the second ink line and the first ink line communicate with a movement passage for forming the ink droplets.
The technical solution is further explained below:
in one embodiment, the first ink line and the second ink line communicate to form a straight line type channel.
In one embodiment, the number of groups of the deflection plates is equal to the number of dot matrixes of the ink-jet printer.
In one embodiment, the positive electrode plate and the negative electrode plate are arranged in parallel, the positive electrode plate is arranged on one side of the second ink line, and the negative electrode plate is arranged on the other side of the second ink line.
In one embodiment, the positive and negative plates of each set of deflection plates are all equidistant from each other.
In one embodiment, the charging plate comprises two metal plates which are arranged in a face-to-face manner, and the first ink line channel is formed between the two metal plates.
In one embodiment, the nozzle further comprises a crystal oscillator module, the crystal oscillator module is arranged on one side of the charging plate far away from the deflection plate, the crystal oscillator module is provided with a nozzle and an ink outlet pipeline, the ink outlet pipeline is used for inputting ink into the crystal oscillator module, and the nozzle is used for ejecting the ink into the first ink line channel of the charging plate.
In one embodiment, the head further comprises a recovery duct, one end of which is disposed toward the second ink line, for receiving ink droplets from within the deflection plate; the other end of the recovery pipeline is communicated with the ink outlet pipeline.
In one embodiment, the nozzle further comprises an observation lamp disposed between the charging plate and the deflection plate, the observation lamp having an opening therein through which the ink droplets pass from the charging plate into the deflection plate.
In one embodiment, the showerhead further comprises a housing, and the charging plate, the deflection plate, and the observation lamp are disposed within the housing.
In one embodiment, an ink jet printer includes a nozzle as described above.
In one embodiment, an inkjet printing method of the inkjet printing machine includes the following steps:
supplying power to the charging plate, wherein the charging voltage of the charging plate in the spray head is kept constant in the charging process;
supplying power to a crystal oscillator module in the spray head, opening an ink outlet pipeline of the crystal oscillator module and supplying ink to the crystal oscillator module;
and electrifying the deflection plates of the corresponding group according to the jet printing position of the object to be jet printed, and keeping the deflection plates of the corresponding group in an electrified state when ink drops pass through the deflection plates of the corresponding group.
In one embodiment, in the step of energizing the deflection plates of the corresponding group according to the jet printing position of the object to be jet printed, the jet printing position includes a blank area and a jet printing area, and the step specifically includes:
judging that the spray printing position is in a blank area or a spray printing area;
for blank areas, none of the deflection plates of each group is energized;
for the jet printing area, the relationship between the jet printing area and each group of deflection plates is as follows:
when the deflection plate closest to the object to be printed is electrified, the ink point falls to the first position; when the deflection plate farthest away from the object to be printed is electrified, the ink point falls to the second position; in the same row of ink dots on the jet printing object, the Xth ink dot is used for indicating the Xth ink dot from the first position to the second position, and the ink dot at the first position is used as the first ink dot; the Nth group of deflection plates are counted from the direction close to the object to be printed to the direction far away from the object to be printed, the deflection plate closest to the object to be printed is taken as the first group of deflection plates, and the deflection plate farthest from the object to be printed is taken as the last group of deflection plates; the Xth ink dot is charged corresponding to the Nth group of deflection plates, wherein X is N, and when the Xth ink dot passes through the Nth group of deflection plates, the Nth group of deflection plates keep the electrified state.
The spray head, the ink-jet printer and the ink-jet printing method at least have the following beneficial effects:
the embodiment provides a spray head which comprises a charging plate and a deflection plate. In the embodiment, a plurality of groups of deflection plates are arranged at the positions adjacent to the charging plates, the second ink line channel and the first ink line channel of each group of deflection plates are communicated, and ink drops enter the second ink line channel from the first ink line channel. The multiple groups of deflection plates intermittently charge the ink drops, so that the drop tracks of the charged ink drops are deflected and fall to a specified place. In the above process, the charging plate may be charged with a fixed voltage, so that all the individual droplets passing through the charging plate are charged with the same amount of charge, and so that the amount of charge per droplet is the same. The charging panel can be always in a power-on state and continuously charges the ink drops, namely the charging panel does not need to be cycled through the steps of opening, charging, closing and the like, so that the jet printing speed of the ink jet printer is not limited, and the service life of the charging panel is prolonged. In addition, the charged ink drops are intermittently charged by the deflection plates, the falling tracks of the charged ink drops are changed, the charged ink drops fall to a specified place, and accurate code spraying is realized.
Drawings
Fig. 1 is a schematic cross-sectional exploded view of a showerhead according to an embodiment of the present invention;
FIG. 2 is a front view of FIG. 1;
fig. 3 is a schematic structural diagram of a crystal oscillator module according to an embodiment of the present invention.
Description of reference numerals: 100. a spray head; 110. a housing; 120. a charging plate; 121. a first ink line; 130. a deflection plate; 131. a positive plate; 132. a negative plate; 133. a second ink line; 140. a crystal oscillator module; 141. a nozzle; 142. an ink outlet conduit; 143. a crystal oscillation element; 144. a pressurized ink chamber; 145. a one-way valve; 150. a recovery pipeline; 160. an observation lamp; 161. and (4) opening.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The embodiment provides a spray head 100 and an inkjet printer, which have the advantages of reducing the limit on the spray printing speed of the inkjet printer, reducing the workload of the charging plate 120, and prolonging the service life of the charging plate 120, and will be described in detail below with reference to the accompanying drawings.
In one embodiment, referring to fig. 1 to 3, a spray head 100 and an inkjet printer includes a charging plate 120 and a plurality of deflection plates 130. Specifically, the charging voltage of the charging plate 120 may be a fixed voltage value, and the charging plate 120 has a first ink path 121 for ink droplets to pass through. Each set of deflection plates 130 includes a positive plate 131 and a negative plate 132, the positive plate 131 and the negative plate 132 being disposed face to face with a gap therebetween for forming a second ink line 133 through which ink droplets pass. The second ink channels 133 of the sets of deflection plates 130 are through. Deflection plate 130 is disposed adjacent to charging plate 120, and second ink line 133 and first ink line 121 communicate a movement path for forming ink droplets.
This embodiment is configured such that by providing a plurality of sets of deflection plates 130 at positions adjacent to charging plate 120, second ink lane 133 of each set of deflection plates 130 communicates with first ink lane 121, and ink droplets enter second ink lane 133 from first ink lane 121. The multiple deflection plates 130 intermittently charge the ink drops to deflect the falling trajectory of the charged ink drops to a specified location. In the above process, the charging plate 120 may be charged with a fixed voltage, so that all the individual droplets passing through the charging plate 120 are charged with the same charge amount, and the charge amount of each droplet is the same. The charging plate 120 can be always in a power-on state and continuously charge the ink droplets, that is, the charging plate 120 does not need to be cycled through the steps of starting, charging, closing and the like, so that the jet printing speed of the ink jet printer is not limited, and the service life of the charging plate 120 is prolonged. In addition, the multiple groups of deflection plates 130 intermittently charge the charged ink drops, change the falling tracks of the charged ink drops, and fall to a specified place to realize accurate code spraying.
In one embodiment, referring to fig. 1 and 2, the first ink line 121 and the second ink line 133 form a straight channel. Specifically, each set of deflection plates 130 is arranged directly below charging plate 120 in sequence, so that first ink line 121 in charging plate 120 and second ink line 133 of each set of deflection plates 130 are aligned to facilitate smooth entry of ink droplets from first ink line 121 into second ink line 133.
In one embodiment, referring to fig. 1 and 2, the positive electrode plate 131 and the negative electrode plate 132 are disposed in parallel, the positive electrode plate 131 is disposed on one side of the second ink channel 133, and the negative electrode plate 132 is disposed on the other side of the second ink channel 133. Specifically, the positive plates 131 of the sets of deflection plates 130 are all disposed on the same side of the second ink line 133, and the negative plates 132 of the sets of deflection plates 130 are all disposed on the other side of the second ink line 133. Further, the distances between the positive plates 131 and the negative plates 132 of the deflection plates 130 are all equal, so that when the deflection plates 130 are all powered on, the electric field distribution between each group of deflection plates 130 is all the same, that is, the force of the charged ink drops in the electric field of each group of deflection plates 130 is the same. Further, a uniform electric field is formed between the positive electrode plate 131 and the negative electrode plate 132 of each set of deflection plates 130. The setting of the uniform electric field is convenient for deducing the regular motion of the ink drop, and then the motion of the ink drop can be conveniently controlled by adjusting the intensity of the field intensity.
In one embodiment, referring to fig. 1 and 2, the number of sets of deflection plates 130 is equal to the dot matrix of the inkjet printer. Specifically, in practical production application, an inkjet printer with a maximum inkjet printing height of 32 dot matrixes (with a maximum inkjet printing height of 32 dot matrixes, that is, a range of inkjet printing heights of 6.5 mm to 27 mm) is provided, and 32 groups of deflection plates 130 are arranged in the nozzle 100; the inkjet printer with the maximum inkjet printing height of 16 dot matrixes (the maximum inkjet printing height is 16 dot matrixes, that is, the range of the inkjet printing height is 6.5-12 mm), 16 groups of deflection plates 130 are arranged in the nozzle 100, and so on in other cases, which is not described herein again.
In one embodiment, referring to fig. 1 and 2, the charging plate 120 includes two metal plates disposed opposite to each other, and a first ink line 121 is formed between the two metal plates. When the charging plate 120 is powered on, the metal plate is positively charged. Specifically, after the charging plate 120 is charged, the two metal plates of the charging plate 120 are both charged with positive charges, and when the ink drop moves into the first ink line 121, the positive charges of the ink drop are repelled by the positive charges of the metal plates of the charging plate 120, so that the ink drop is finally charged with negative charges in the charging plate 120. The charging voltage of the charging plate 120 is set to be constant, and the amount of charge per droplet is the same on the premise that the size of each droplet is the same.
In one embodiment, referring to fig. 1 to 3, the inkjet head 100 further includes a crystal oscillator module 140, the crystal oscillator module 140 is disposed on a side of the charging plate 120 away from the deflection plate 130, the crystal oscillator module 140 is provided with a nozzle 141 and an ink outlet pipe 142, the ink outlet pipe 142 is used for inputting ink into the crystal oscillator module 140, and the nozzle 141 is used for ejecting the ink into the first ink line 121 of the charging plate 120. Further, the crystal oscillation module 140 further includes a crystal oscillation element 143, and the crystal oscillation element 143 is configured to oscillate in the nozzle 141 to separate the ink droplets. The crystal oscillator module 140 has a pressurized ink chamber 144 therein.
Specifically, referring to fig. 1 to 3, the ink outlet pipe 142 communicates with the pressurized ink chamber 144 and transports ink droplets into the pressurized ink chamber 144, and the pressurized ink chamber 144 is filled with ink and has a constant hydraulic pressure. The end of the ink outlet conduit 142 near the pressurized ink chamber 144 is provided with a check valve 145. The check valve 145 allows ink to flow only in one direction from the inside of the ink jet printer to the pressurized ink chamber 144, thereby preventing ink from flowing backwards. In addition, the ink enters the pressurized ink cavity 144 from the inside of the inkjet printer through the ink outlet pipeline 142 and cannot flow back due to the check valve 145, according to bernoulli's law, the flow rate of the ink in the ink outlet pipeline 142 is larger than that in the pressurized ink cavity 144, the pressure in the pressurized ink cavity 144 can be increased, and therefore the effect of increasing the hydraulic pressure in the pressurized ink cavity 144 can be achieved. The nozzle 141 is a small circular hole at the bottom of the pressurized ink chamber 144, and the diameter of the circular hole is 25 μm to 75 μm (different according to the type of the ink jet printer). The crystal oscillator element 143 is a cylindrical crystal made of a special material, and is immersed in the pressurized ink chamber 144 to completely block the nozzle 141 in a static state. When the crystal oscillator 143 is activated, it will vibrate at a high speed with a high frequency (e.g. 62500Hz, the specific vibration frequency depends on the type of the inkjet printer), and the ink in the pressurized ink chamber 144 will intermittently flow out from the nozzle 141 under the action of the hydraulic pressure and will move downward in the shape of an ink droplet under the action of the hydraulic pressure and the gravity. Immediately after the ink droplets leave the nozzle 141, the ink droplets are substantially circular and stick to each other; during the subsequent movement, the ink drops are influenced by air resistance and gravity, the shape of the ink drops generally tends to be a drop shape, and the adjacent ink drops are completely separated and do not stick to each other.
Further, referring to fig. 1 to 3, the showerhead 100 further includes a ground line (not shown), one end of which is connected to the crystal oscillator module 140, and the other end of which is grounded. The conductive metal plates (e.g., a pair of conductive metal plates of 5mm × 1 mm) of the charging plate 120 are installed right below the crystal oscillator module 140, e.g., the distance from the charging plate 120 to the crystal oscillator module 140 is 10 mm. Due to the influence of gravity, the ink droplets from the nozzles 141 enter the first ink path 121 of the charge plate 120 while still in a partially coherent state, but have been completely broken off into respective completely separated ink droplets upon exiting the first ink path 121 of the charge plate 120. Specifically, when the charging plate 120 is charged, the conductive metal plate of the charging plate 120 is positively charged. Part of positive charges of the ink drops are repelled by the positive charges of the charging plate and are led out along the grounding line, so that the ink drops are charged with negative charges after being completely separated. In the case where the charging voltage of the charging plate 120 is set to be constant and the hydraulic pressure of the pressurized ink chamber 144 and the vibration frequency of the crystal oscillation element 143 are both constant, the size, speed, and amount of carried charge of each droplet will remain the same. Further, deflection plate 130 is disposed directly below charging plate 120, such as deflection plate 130 being disposed directly 10mm below charging plate 120. The ink drops from the first ink line 121 with negative charges enter the second ink line 133 in the deflection plate 130, are deflected under the action of the electric field force of the uniform electric field in the second ink line 133, and finally fall to a designated place, so that accurate code spraying is realized.
In one embodiment, referring to fig. 1-3, the inkjet head 100 further includes a recovery duct 150, one end of the recovery duct 150 being disposed toward the second ink line 133 for receiving ink droplets from the deflection plate 130. The other end of the recovery duct 150 communicates with the ink outlet duct 142. Specifically, the orifice of the recovery duct 150 aligns the travel trajectory of the ink droplets as they exit the nozzle 141 and fall vertically. When the falling ink drop is not needed (i.e. the jet printing information contains blank dots, and no ink drop is needed to be attached), the deflection plate 130 will not be energized during the vertical falling and passing of the ink drop, so the ink drop is not affected by the electric field force, and the ink drop will not be deflected towards the positive plate 131, and will remain in the vertical falling state and finally fall into the orifice of the recycling pipe 150, and then be transported back to the pressurized ink chamber 144 for reuse. The arrangement of the recycling pipeline 150 is beneficial to recycling the ink drops which are not needed to be used into the pressurized ink cavity 144, and effectively avoids the ink drops which are not needed to be used from splashing on the surface of the sprayed printed object to cause the pollution of the sprayed printed information and the waste of the ink.
In one embodiment, referring to fig. 1 and 2, the nozzle 100 further includes a viewing light 160, the viewing light 160 is disposed between the charging plate 120 and the deflection plate 130, an opening 161 is disposed in the viewing light 160, and ink drops enter the deflection plate 130 from the charging plate 120 through the opening 161. The observation lamp 160 is a circular green LED lamp and is installed right under the charging plate 120. The ink drop observing lamp 160 is used as a bottom light source, so that an operator can observe whether the shape of the completely separated ink drops meets the required standard through a handheld magnifying lens. Generally, the ink drops meeting the required standard should be in the form of water drops, and the adjacent ink drops are completely disconnected from each other and are not sticky, and the travel of the ink drops can be obviously observed. If the operator observes that the drop shape does not meet the desired criteria, the operator may attempt to change the drop shape to meet the desired criteria by adjusting the frequency of vibration of crystal element 143 within pressurized ink chamber 144.
Referring to fig. 1, the showerhead 100 further includes a housing 110, and the housing 110 mainly includes a stainless steel outer shell and a plastic fixing member. The stainless steel shell is mainly used for protecting internal components and circuit boards in the using process and preventing the components and the circuit boards from being influenced by external force impact, water vapor and the like. The plastic fixing member is used to fix and seal the internal circuit board, and the crystal oscillator module 140, the charging plate 120, the observation lamp 160, the deflection plate 130, and the recovery duct 150 are installed and fixed in the housing 100.
In one embodiment, an inkjet printer includes the inkjet head 100 according to any of the above embodiments. Since the inkjet printer includes the nozzle 100, the technical effects are brought by the nozzle 100, and the beneficial effects already include the beneficial effects of the nozzle 100, which is not described herein again.
In one embodiment, referring to fig. 1 to 3, the method for code spraying of the code spraying machine specifically includes:
in step S1, power is supplied to the charging plate 120, and the charging voltage of the charging plate 120 in the head 100 is kept constant during the charging process. In this step, the charging plate 120 is charged with a constant voltage so that all the individual droplets passing through the charging plate 120 are charged with the same amount of charge so that the amount of charge per droplet is the same. The charging plate 120 can be always in a power-on state and continuously charge the ink droplets, that is, the charging plate 120 does not need to be cycled through the steps of starting, charging, closing and the like, so that the jet printing speed of the ink jet printer is not limited, and the service life of the charging plate 120 is prolonged.
And step S2, supplying power to the crystal oscillator module in the spray head, opening an ink outlet pipeline of the crystal oscillator module and supplying ink to the crystal oscillator module. In this step, the ink outlet pipe 142 is used to input ink into the crystal oscillator module 140, and the nozzle 141 is used to eject ink into the first ink line 121 of the charging plate 120. Further, the crystal oscillator module 140 further includes a crystal oscillator element 143, and the crystal oscillator element 143 vibrates in the nozzle 141 after the crystal oscillator module is powered on, so as to separate the ink droplets.
Step S3, energizing the corresponding set of deflection plates 130 according to the printing position of the object to be printed, and maintaining the energized state of the corresponding set of deflection plates 130 when the ink drops pass through the corresponding set of deflection plates 130.
Wherein, the jet printing position comprises a blank area and a jet printing area. The blank area refers to an area where code spraying is not needed, and the spray printing area refers to an area where ink spraying is needed.
In this step, it is first determined whether the inkjet printing position is in a blank area or an inkjet printing area. For blank areas, none of the sets of deflection plates 130 are energized. For the jet printing area, the final jet printing position of the ink dot and the electrification of the deflection plate 130 are in the following relation: when the deflection plate 130 closest to the object to be printed is energized, the ink dots fall to the first position; when the deflection plate 130 farthest away from the object to be printed is electrified, the ink dots fall to the second position; in the same row of ink dots on the jet printing object, the Xth ink dot is represented from the first position to the second position, the ink dot at the first position is taken as the first ink dot, and the Nth group of deflection plates 130 is represented from the direction close to the object to be jet printed to the direction far away from the jet printing object; the deflection plate 130 closest to the object to be printed is taken as a first group of deflection plates 130, and the deflection plate 130 farthest from the object to be printed is taken as a last group of deflection plates 130; the X-th dot corresponds to the N-th set of deflection plates 130 being charged, where X is N. And, when the Xth dot passes through the Nth group of deflection plates, the Nth group of deflection plates are kept in the energized state.
The use of deflector plate 130 is described in more detail below:
referring to fig. 1 and 2, a plurality of sets of deflection plates 130 are mounted directly below the charge plate 120. Each group of deflection plates 130 consists of a positive plate 131 and a negative plate 132, the positive and negative plates 132 are conductive metal plates, and the distance between each adjacent group of deflection plates 130 can be a fixed value, such as 0.5mm and 0.6 mm; the sets of deflection plates 130 are arranged in sequence directly below the charging plate 120 with their respective positive plates 131 positioned to the left of the second ink line 133 and their respective negative plates 132 positioned to the right of the second ink line 133. Theoretically, the number of groups of the deflection plates 130 is equal to the number of dot matrixes allowed to be printed by the inkjet printer (the number of dot matrixes is the maximum printing height of the inkjet printer), for example: the maximum spray printing height is 32 code spraying machine, the spray head 100 has 32 sections of charged deflection plates 130; the maximum jet printing height is 16 inkjet printing machines, and 16 sections of charged deflection plates 130 are arranged in the jet head 100. After the positive plate 131 and the negative plate 132 are electrified, high voltage is respectively applied to the positive plate 131 and the negative plate 132 (such as +3800V applied to the positive plate 131 and-3800V applied to the negative plate 132); when the positive and negative plates 132 are not energized, no voltage is applied. When the charged ink droplets pass through the middle of the specific charged deflection plate 130 during the falling process, a potential difference exists between the positive electrode plate 131 and the negative electrode plate 132 of the charged deflection plate 130 to form a uniform electric field in the middle region of the charged deflection plate 130. The charged droplets are subjected to an electric field force in a uniform electric field to produce an acceleration in the horizontal direction, and the negatively charged droplets are subjected to an electric field force to have a velocity directed in the horizontal direction (to the left) toward the positive plate 131. While the charged deflection plate 130 is closed or remains open depending on the landing position of the next charged drop. Different sets of deflection plates 130 can be controlled to be in a powered or unpowered state, respectively, so that each charged dot can be given a velocity to the left, respectively. Since each dot travels through the sets of deflection plates 130 in a very short time, the velocity change due to gravity is negligible, and each dot can theoretically be considered to be passing through each set of deflection plates 130 at a uniform velocity. The relationship between the ink dot and whether the sets of deflection plates 130 are energized or not is: if the ink dot is not needed for jet printing, during the process that the ink dot passes through multiple groups of deflection plates 130 at a constant speed, each group of deflection plates 130 keeps an unpowered state, and the ink dot does not have a horizontal speed and finally enters the ink droplet recovery pipeline 150 to return to the pressurized ink cavity 144; if the ink dot needs to be used for jet printing, in the process that the ink dot passes through a plurality of groups of deflection plates 130 at a constant speed, a specific deflection plate 130 is changed into a power-on state, so that the ink dot obtains a speed in the horizontal direction and finally falls to a specified jet printing position. In the above process, the relationship between the final ink dot jet position and the specific deflection plate 130 that is energized is: in the same row of ink dots of the jet printing information, the Xth ink dot counted from right to left is represented by the Xth ink dot. That is, the rightmost end is the first dot and the leftmost end is the last dot. The nth set of deflection plates 130 is shown from bottom to top as the nth set of deflection plates 130. That is, deflection plate 130 farthest from charging plate 120 is referred to as the first set of deflection plates 130, and deflection plate 130 closest to charging plate 120 is referred to as the last set of deflection plates 130. Specifically, the X-th dot corresponds to the N-th group of deflection plates 130 being charged, where X is N. Namely: when X is equal to N is equal to 1, the first ink dot from the right to the left corresponds to the first group of deflection plates 130 counted from the bottom to the top; when X is equal to N, 2, the second ink dot from the right to the left corresponds to the second group of deflection plates 130 counted from the bottom to the top. The other deflection plates 130 corresponding to the ink dots are charged and so on, will not be described herein.
The nozzle 100 provided by the present embodiment includes the charging plate 120, and the charging voltage of the charging plate 120 is a fixed value, so that all the charging amounts of the individual ink drops passing through the charging plate 120 have the same charge amount, and the charge amount of each ink drop is the same. This embodiment is configured such that by providing a plurality of sets of deflection plates 130 at positions adjacent to charging plate 120, second ink lane 133 of each set of deflection plates 130 communicates with first ink lane 121, and ink droplets enter second ink lane 133 from first ink lane 121. The multiple deflection plates 130 intermittently charge the ink drops to deflect the falling trajectory of the charged ink drops to a specified location. In the above process, the charging plate 120 may be always in a power-on state, and the ink droplets are continuously charged, that is, the charging plate 120 does not need to be cycled through the steps of starting, charging, closing, and the like, so that the printing speed of the inkjet printer is not limited, and the service life of the charging plate 120 is prolonged. In addition, the multiple groups of deflection plates 130 intermittently charge the charged ink drops, change the falling tracks of the charged ink drops, and fall to a specified place to realize accurate code spraying.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A spray head, comprising:
a charging plate provided with a first ink line for passage of an ink droplet;
the deflection plates in each group comprise a positive plate and a negative plate, the positive plate and the negative plate are arranged in a face-to-face mode, a gap is reserved between the positive plate and the negative plate, and the gap is used for forming a second ink line for ink droplets to pass through; the second ink lines of the deflection plates of the plurality of groups are communicated; the second ink line and the first ink line communicate with a movement passage for forming the ink droplets.
2. The inkjet head of claim 1, wherein the first ink line and the second ink line communicate to form a straight line type channel.
3. The spray head of claim 1, wherein the number of sets of deflection plates is equal to the number of dots of the inkjet printer.
4. The head as claimed in claim 1, wherein the positive electrode plate and the negative electrode plate are arranged in parallel, the positive electrode plate is provided on one side of the second ink line, and the negative electrode plate is provided on the other side of the second ink line.
5. The showerhead of claim 1, wherein the positive and negative plates of each set of the deflection plates are all equidistant from each other.
6. The head of claim 1, wherein the charging plate comprises two metal plates disposed in a face-to-face relationship, the two metal plates defining the first ink line channel therebetween.
7. The nozzle according to any one of claims 1 to 6, further comprising a crystal oscillator module, wherein the crystal oscillator module is arranged on one side of the charging plate far away from the deflection plate, the crystal oscillator module is provided with a nozzle and an ink outlet pipeline, the ink outlet pipeline is used for inputting ink into the crystal oscillator module, and the nozzle is used for ejecting the ink into the first ink line of the charging plate.
8. The spray head of claim 7, further comprising a recovery conduit, one end of which is disposed toward the second ink line for receiving ink drops from within the deflection plate; the other end of the recovery pipeline is communicated with the ink outlet pipeline.
9. The spray head of claim 1, further comprising a viewing light disposed between the charge plate and the deflection plate, the viewing light having an opening therein through which the ink drops pass from the charge plate into the deflection plate.
10. The spray head of claim 9, further comprising a housing, wherein the charging plate, the deflection plate, and the viewing light are disposed within the housing.
11. An ink jet printer comprising a spray head according to any one of claims 1 to 10.
12. An ink-jet printing method based on the ink-jet printer according to claim 11, characterized by comprising the steps of:
supplying power to the charging plate, wherein the charging voltage of the charging plate in the spray head is kept constant in the charging process;
supplying power to a crystal oscillator module in the spray head, opening an ink outlet pipeline of the crystal oscillator module and supplying ink to the crystal oscillator module;
and electrifying the deflection plates of the corresponding group according to the jet printing position of the object to be jet printed, and keeping the deflection plates of the corresponding group in an electrified state when ink drops pass through the deflection plates of the corresponding group.
13. A method according to claim 12, wherein in the step of energizing the corresponding set of deflection plates according to the position of the object to be printed, the position of the object to be printed includes a blank area and a printing area, and the step specifically includes:
judging that the spray printing position is in a blank area or a spray printing area;
for blank areas, none of the deflection plates of each group is energized;
for the jet printing area, the relationship between the jet printing area and each group of deflection plates is as follows:
when the deflection plate closest to the object to be printed is electrified, the ink point falls to the first position; when the deflection plate farthest away from the object to be printed is electrified, the ink point falls to the second position; in the same row of ink dots on the jet printing object, the Xth ink dot is used for indicating the Xth ink dot from the first position to the second position, and the ink dot at the first position is used as the first ink dot; the Nth group of deflection plates are counted from the direction close to the object to be printed to the direction far away from the object to be printed, the deflection plate closest to the object to be printed is taken as the first group of deflection plates, and the deflection plate farthest from the object to be printed is taken as the last group of deflection plates; the Xth ink dot is charged corresponding to the Nth group of deflection plates, wherein X is N, and when the Xth ink dot passes through the Nth group of deflection plates, the Nth group of deflection plates keep the electrified state.
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| CN201911054621.7A CN110757954A (en) | 2019-10-31 | 2019-10-31 | Spray head, ink jet printer and ink jet printing method |
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| CN201911054621.7A CN110757954A (en) | 2019-10-31 | 2019-10-31 | Spray head, ink jet printer and ink jet printing method |
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