JP3613029B2 - Printer and printing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printer and a printing method for printing on a printing object such as glass or plastic.
[0002]
[Prior art]
Printers are used for printing (or drawing) on industrial parts such as glass and plastic. When printing on an industrial part with this type of printer, the surface state of the industrial part is not necessarily clean, the surface state cannot be defined, and the surface tends to be dirty.
[0003]
[Problems to be solved by the invention]
When the surface condition of industrial parts cannot be specified or the surface is dirty, the ink characteristics and the object to be drawn when printing by supplying ink to the surface of the industrial parts by the printer Alternatively, if the print object does not match, the ink may be repelled or the ink may flow on the surface of the industrial part. If the ink is thus repelled or flows backward, there is a problem that good print quality or drawing quality cannot be obtained on the surface of the industrial part. An object of the present invention is to provide a printer and a printing method capable of solving the above problems and obtaining good print quality or drawing quality.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a printing object mounting means for placing a printing object, a printing means for printing by supplying ink to the printing object mounted on the printing object mounting means, and the printing Corona discharge having a moving means for relatively changing the positions of the printing means and the printing object when the means prints on the printing object, and a corona discharge electrode for performing corona discharge on the printing object. And a generating unit.
[0005]
According to the first aspect of the present invention, the corona discharge electrode of the corona discharge generating means performs corona discharge on the print object, so that the wettability of ink on the print object to be printed by the printing means can be improved. In addition, the ink can be cured (cured) after the ink is printed. Since the wettability of the printing object with respect to the ink can be improved, the ink does not bounce or flow like a ball, and printing with good printing quality can be performed on the printing object. Further, since the ink can be cured, it is possible to prevent the ink from flowing even if the printing object is moved.
[0006]
According to a second aspect of the present invention, in the configuration according to the first aspect, the corona discharge electrode is in a direction perpendicular to a first direction that is a feeding direction of the printing object and is a traveling direction of the printing unit. The second direction is arranged in parallel.
[0007]
According to the second aspect of the present invention, the corona discharge electrode is disposed in a direction perpendicular to the first direction and parallel to the second direction which is the traveling direction of the printing means. For this reason, the corona discharge electrode does not obstruct the progress of the printing means, and can discharge in the direction perpendicular to the first direction which is the feeding direction of the printing object.
[0008]
According to a third aspect of the present invention, in the configuration according to the second aspect, before the printing means performs printing on the print object, the corona discharge electrode causes a corona discharge to a print target position of the print object. It has a control part.
[0009]
In the invention of claim 3, the corona discharge electrode performs corona discharge at the planned printing position before the printing means performs printing on the printing object. For this reason, the wettability with respect to the ink of the printing planned position can be improved before printing on the printing object.
[0010]
According to a fourth aspect of the present invention, in the configuration according to the second aspect, the corona discharge electrode causes the corona discharge electrode to perform corona discharge to a print completion position after the printing unit has printed the print target. It has a control part.
[0011]
In the invention of claim 4, after the printing means performs printing on the printing object, the corona discharge electrode performs corona discharge at the printing completion position. For this reason, the ink of the printed object which has been printed can be cured by corona discharge.
[0012]
According to a fifth aspect of the present invention, in the configuration according to the second, third, or fourth aspect, the moving unit is a first driving unit that sends the print object mounting unit in the feeding direction of the print object in the first direction. And second driving means for sending the printing means in the traveling direction of the printing means, which is the second direction.
[0013]
In the invention of claim 5, the first moving means sends the printing object mounting means in the first direction of feeding the printing object, and the second driving means moves the printing means in the second direction. Send in the direction.
[0014]
According to a sixth aspect of the present invention, in the configuration according to the first aspect, the corona discharge electrode performs a corona discharge to a print target position of the print object before the printing unit performs printing on the print object. And a second electrode portion that corona discharges to a print completion position of the print object after the printing means performs printing on the print object.
[0015]
According to the sixth aspect of the present invention, the first electrode portion of the corona discharge electrode performs corona discharge at the planned printing position of the print object, so that the wettability with respect to the ink at the planned printing position can be improved. The second electrode portion of the corona discharge electrode can cure the ink at the print completion position by causing the print object to corona discharge to the print completion position.
[0016]
According to a seventh aspect of the present invention, in the configuration according to the first aspect, the corona discharge electrode is fixed to the printing unit and moves in synchronization with the movement of the printing unit.
[0017]
According to the seventh aspect of the present invention, the corona discharge electrode is moved in synchronization with the printing means.
[0018]
According to an eighth aspect of the present invention, in the configuration of the first aspect, the corona discharge generating means includes a gap adjusting device that adjusts a gap between the corona discharge electrode and the printing object.
[0019]
In the invention of claim 8, by using this gap adjusting device, it is possible to optimize the discharge by the corona discharge electrode in accordance with the change in the height of the printing object.
[0020]
According to a ninth aspect of the present invention, in a printing method for printing on a printing object by printing means, corona discharge is performed on the printing object when printing is performed by supplying ink to the printing object. Is the printing method.
[0021]
According to the ninth aspect of the present invention, corona discharge can improve ink wettability on a printing object and cure ink after printing.
[0022]
According to a tenth aspect of the present invention, in the configuration according to the ninth aspect, the corona discharge electrode corona discharges to a scheduled print position of the print object before the printing means prints on the print object.
[0023]
According to the tenth aspect of the present invention, the ink wettability at the planned printing position can be improved by performing corona discharge at the planned printing position.
[0024]
According to an eleventh aspect of the present invention, in the configuration according to the ninth aspect, the corona discharge electrode corona discharges to a print completion position of the print object after the printing means performs printing on the print object. .
[0025]
In the eleventh aspect of the invention, the ink can be cured at the print completion position by performing corona discharge to the print completion position of the print object.
[0026]
According to a twelfth aspect of the present invention, in the configuration according to the ninth aspect, the first electrode portion of the corona discharge electrode has a scheduled print position of the print object before the printing means prints on the print object. The second electrode portion of the corona discharge electrode corona discharges to the print completion position of the print object after the printing means prints on the print object.
[0027]
In the twelfth aspect of the invention, the first electrode portion corona discharges to the planned printing position, so that the ink wettability at the planned printing position can be improved, and the second electrode portion corona discharges to the printing completion position. By doing so, the ink can be cured at the print completion position.
[0028]
According to a thirteenth aspect of the present invention, there is provided a printing method for printing an object to be printed by printing means, at least one of before and after printing by supplying ink to the object to be printed. Is a printing method characterized by performing ultraviolet irradiation.
[0029]
In the thirteenth aspect of the invention, the ink wettability can be improved and the ink can be cured by irradiating the print target with ultraviolet rays.
[0030]
According to a fourteenth aspect of the present invention, there is provided a printing method for printing an object to be printed by printing means, at least one of before and after printing by supplying ink to the object to be printed. The printing method is characterized in that electron beam irradiation is performed.
[0031]
In the invention of claim 14, by irradiating the print object with an electron beam, the ink wettability on the print object can be improved and the ink can be cured.
[0032]
According to a fifteenth aspect of the present invention, there is provided a printing method for printing an object to be printed by printing means, at least one of before and after printing by supplying ink to the object to be printed. This is a printing method characterized by spraying ozone on the surface.
[0033]
According to the fifteenth aspect of the present invention, by spraying ozone onto the print object, the ink wettability with respect to the print object can be improved and the ink can be cured.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0035]
FIG. 1 is a perspective view showing an embodiment of a printer of the present invention.
[0036]
1, the printer 10 generally includes a base 12, a moving unit 15, a table 46 that is a printing object mounting unit, an inkjet head 20 that is a printing unit, a corona discharge generating unit 100, and the like. The base 12 supports the first driving means 14 and the second driving means 16 of the moving means 15.
[0037]
The moving unit 15 includes the first driving unit 14 and the second driving unit 16 described above. The first driving means 14 is directly mounted on the base 12, and the first driving means 14 can position the table 46 by moving it in the Y axis (first direction). The first drive unit 14 includes a table 46, a slider 42, and a guide 41. The rails 40 and 40 of the guide 41 guide the slider 42 in the Y-axis direction. A table 46 is mounted on the slider 42 via a θ-axis motor 44. When the motor 44 is actuated, the table 46 can be indexed with respect to the slider 42 in the θ direction (rotational direction with respect to the vertical axis).
[0038]
The table 46 can accurately position the print object 48 using the positioning member 46B. The suction holding unit 50 sucks and holds the print object 48 on the table 46 by vacuum suction through the hole 46A of the table 46.
[0039]
The print object 48 is, for example, a flat industrial part. The print object 48 is made of, for example, plastic or glass. The slider 42 can be moved and positioned in the Y-axis direction by the operation of the motor 14. This motor 14 is, for example, a linear motor.
[0040]
The second driving means 16 of the moving means 15 includes supports 16A and 16A, a column 16B, a slider 60, and the like. The column 16B is supported horizontally by the supports 16A and 16A with a space from the base 12. The slider 60 can be moved and positioned by the rails 62A and 62A along the X axis (second direction) by operating the motor 17. This motor 17 is, for example, a linear motor.
[0041]
The slider 60 has motors 62, 64, 66, and 68 for moving and positioning the inkjet head 20 in various directions, for example. If the motor 62 is operated, the inkjet head 20 can be positioned by moving up and down along the Z-axis direction (up and down direction). The Z axis is a direction orthogonal to the X axis.
[0042]
When the motor 64 is operated, the inkjet head 20 can be positioned by swinging along the β direction. When the motor 66 is operated, the inkjet head 20 can be positioned by swinging in the γ direction. When the motor 68 is operated, the inkjet head 20 can be positioned by swinging in the α direction.
[0043]
As described above, the inkjet head 20 can be positioned by linearly moving in the Z-axis direction on the slider 60 and can be positioned by swinging along α, β, and γ. From this, the position or posture of the ink ejection surface 20p of the inkjet head 20 can be accurately controlled in response to a change in the shape and height of the print object 48 of the table 46.
[0044]
FIG. 2 shows an example of an object controlled by the control unit 80. The control unit 80 performs various controls of the motors 44, 14, 17, 62, 68, 64, 66 described above.
[0045]
The control unit 80 supplies a piezo element drive signal S3 to the piezo element drive circuit 101. This piezo element drive signal S3 drives the piezo elements of the inkjet head 20 based on the ink management information sent from the ink management controller 98 via the computer 34, and applies an appropriate amount of ink to the inkjet head 20. Is supplied to the print object 40 from the printer.
[0046]
The ink jet head 20 is connected to an ink supply unit 97, and the viscosity and temperature of the ink supply unit 97 are controlled by a viscometer 95 and a thermometer 96. A feedback signal S 2 is sent from the viscometer 95 to the ink management controller 98, and a feedback signal S 1 of ink status is sent from the thermometer 96 to the ink management controller 98.
[0047]
As a result, the ink management controller 98 determines the state of the ink in the ink supply unit 97 and sends a piezo element drive signal S3 corresponding to the state to the piezo element drive circuit 101 via the computer 34. The piezo element driving circuit 101 operates the inkjet head 20 in accordance with the state of such ink, and supplies an appropriate amount of ink to the print object 48.
[0048]
Next, the corona discharge generating means 100 in FIG. 1 includes an operation unit 120, an AC power supply 121, and a corona discharge electrode 122. The AC power supply 121 is electrically connected to the corona discharge electrode 122 and the table 46. Thereby, corona discharge can be caused between the corona discharge electrode 122 and the table 46, that is, the printing object 48.
[0049]
This AC power supply 121 is, for example,
Frequency: About 15KHz
Output voltage: 0 to 14,000 V (variable and adjusted according to the gap, material, etc. with the object)
Power consumption: 80VA at startup, 350VA at discharge
It is.
[0050]
The operation unit 120 can bring the corona discharge electrode 122 closer to or away from the print object 48 mounted on the table 46 with a predetermined gap. The operation unit 120 is configured so that the corona discharge electrode 122 is brought closer to the printing object 48 in synchronization with the operation in which the inkjet head 20 approaches the printing object 48, and when the inkjet head 20 is far from the printing object 48, The corona discharge electrode 122 is also an actuator that can be separated from the printing object 48.
[0051]
However, as the operation unit 120, the motors 62, 64, 66, 68 for the inkjet head 20 and the slider 60 may be combined. Thereby, the corona discharge electrode 122 can be moved and positioned in synchronization with the movement and positioning of the inkjet head 20.
[0052]
2 controls the operation of the AC power supply 121 and the operation unit 120.
[0053]
FIG. 3 shows the corona discharge generating means 100, the table 46, the inkjet head 20, the second driving means 16 and the like in a simplified manner. A printing object 48 is mounted on the table 46.
[0054]
The corona discharge electrode 122 can be made, for example, by bending a rod-shaped body, and the corona discharge electrode 122 can be made of an electrically insulating coating such as fluororesin, silicon rubber, or polypropylene with respect to iron or other conductors. Is given.
[0055]
The corona discharge electrode 122 has a straight portion 122A and a support portion 122B. The length L of the straight portion 122A is preferably set larger than the width W of the print object 48. This is because the discharge from the straight portion 122A of the corona discharge electrode 122 can be discharged over the entire area with respect to the width W of the print object 48 without leakage.
[0056]
The support portion 122B supports the straight portion 122A and is electrically connected to the AC power source 121. The operation unit 120 supports the support portion 122B.
[0057]
The table 46 can be moved and positioned in the first direction + Y and −Y, and the inkjet head 20 can be moved and positioned in the second direction + X and −X.
[0058]
The AC power source 121 supplies a high-frequency voltage to the corona discharge electrode 122 and the table 46, and as a result, corona discharge can be generated between the corona discharge electrode 122 and the table 46, that is, to the print object 48.
[0059]
In the embodiment of FIG. 3, one corona discharge electrode 122 is disposed in the vicinity of the inkjet head 20. Moreover, the direction of the linear portion 122A of the corona discharge electrode 122 is parallel to the X direction (second direction) in which the inkjet head 20 moves, and with respect to the Y-axis direction (first direction) in which the print object 48 moves. Is perpendicular.
[0060]
When the inkjet head 20 prints on the printing object 48, the printing ink 20A is sequentially formed. In this way, when the printing ink 20A is arranged and printed, the corona discharge electrode 122 performs corona discharge on the scheduled printing position P of the printing object to be printed. In this way, by applying corona discharge to the scheduled printing position P of the print object 48, the ink wettability on the print object can be improved or appropriately adjusted. The reason why the wettability can be improved in this way is, for example, that a corona discharge is applied to the surface of the plastic to generate a carbonyl group, a hydroxyl group, and the like, thereby increasing the affinity with the ink.
[0061]
By improving the wettability of the ink at the scheduled printing position P on the print object 48, the ink to be printed will be rebounded or flown on the surface of the print object 48. Absent. Accordingly, the drawing quality or printing quality of the printing ink 20A can be improved. That is, the surface state of the printing object 48 such as an industrial part cannot be defined, and even when the surface is dirty, such wettability can be improved appropriately.
[0062]
The scheduled printing position P is, for example, a position several lines before or one line before the printing ink 20A is printed.
[0063]
4 and 5 show a state in which corona discharge is performed by the corona discharge electrode 122 with respect to the scheduled print position P of the print object 48 as described above.
[0064]
Next, another embodiment of the printer of the present invention will be described. In FIG. 6, the corona discharge electrode 122 is characterized by having a first electrode portion 123 and a second electrode portion 124.
[0065]
The first electrode portion 123 performs corona discharge on the scheduled print position P of the print object 48, while the second electrode portion 124 performs corona discharge on the already printed print completion position P1.
[0066]
The first electrode portion 123 and the second electrode portion 124 have the same shape, and the same shape as the corona discharge electrode 122 of FIG. 3 described above. The 1st electrode part 123 and the 2nd electrode part 124 are connected to AC power supply 121, and are given a high frequency voltage at a certain time as needed, or are always given a high frequency voltage. The operation unit 120 integrally moves the first electrode unit 123 and the second electrode unit 124 in the Z direction, and moves the first electrode unit 123 and the second electrode unit 124 with respect to the print object 48 with a predetermined gap. Place them apart.
[0067]
FIGS. 7 and 8 show a state in which discharge is performed to the scheduled print position P and the print completion position P1 using the two first electrode parts 123 and the second electrode part 124, respectively.
[0068]
The scheduled printing position P can improve the wettability of the printing object 48 with respect to ink by receiving corona discharge by the first electrode portion 123. The second electrode portion 124 can cure (harden) the printing ink 20A at the printing completion position P1.
[0069]
Since the two electrode parts 123 and 124 are arranged in parallel so as to sandwich the inkjet head 20 in this way, it is possible to improve wettability before printing and cure after printing at the same time. Efficiency can be further increased.
[0070]
By using the rod-shaped corona discharge electrode as described above, the corona discharge electrode can be moved closer to or away from the object to be printed without drawing the wiring between the AC power source and the corona discharge electrode.
[0071]
9 to 12 show still another embodiment of the printer of the present invention.
[0072]
The above-described corona discharge electrodes (the first electrode portion 123 and the second electrode portion 124) can be lowered and positioned or lifted in the Z direction by the operation portion 120. The corona discharge electrode 122 (the first electrode portion 123 and the second electrode portion 124) is supported on the support plate 140 of the operation unit 120 by using a gap adjusting device 170 as shown in FIG. 9 or FIG. Can do.
[0073]
9 includes, for example, a nut 171, a screw 172, a spring 173, and a member 174. A spring 173 is disposed between the member 174 and the support plate 140. By rotating and positioning the nut 171 to an appropriate position, the corona discharge electrode 122 (the first electrode portion 123 and the second electrode portion 124) is positioned with a predetermined gap G with respect to the print object 48. .
[0074]
FIG. 10 shows another example of the gap adjusting device 270. The gap adjusting device 270 also includes a nut 271, a screw 272, a spring 273, and the like with respect to the plate 280 of the operation unit 120. The spring 273 is disposed between the support plate 280 and the corona discharge electrode 122 (the first electrode portion 123 and the second electrode portion 124). If the screw 273 is adjusted to a predetermined position, the corona discharge electrode 122 (the first electrode portion 123 and the second electrode portion 124) can be set to a predetermined gap G.
[0075]
FIG. 11 shows still another embodiment of the printer of the present invention.
[0076]
The general configuration of the printer 310 in FIG. 11 is the same as that of the printer 10 in FIG. 1, but the structure of the corona discharge generating means 400 is different. As shown in FIGS. 11 to 13, the corona discharge generator 400 includes a corona discharge electrode 422, a corona discharge electrode 423, and an AC power source 424. The AC power source 424 is electrically connected to the two corona discharge electrodes 422 and 423 and the table 46.
[0077]
The corona discharge electrodes 422 and 423 have substantially the same structure, but the corona discharge electrode 422 is fixed to one end 20X of the inkjet head 20 as shown in FIG. 423 is fixed to the other end 20Y of the inkjet head 20. That is, the corona discharge electrodes 422 and 423 are fixed in the opposite direction by 180 °.
[0078]
For example, when the inkjet head 20 is moving in the −X direction (leftward in FIG. 12) in FIG. 12, the corona discharge electrode 422 is corona with respect to the scheduled print position P of the print object 48 on the front side in the traveling direction. Discharge. As a result, the print scheduled position P can improve the wettability of the ink.
[0079]
On the other hand, the corona discharge electrode 423 performs a curing process of the printing ink 20A after printing by the inkjet head 20 by discharging.
[0080]
Conversely, as shown in FIG. 14, when the inkjet head 20 is moving and printing in the + X direction, the corona discharge electrodes 422 and 423 produce the opposite effect. That is, the corona discharge electrode 423 improves the wettability of the ink at the scheduled printing position P on the front side in the traveling direction, and the other corona discharge electrode 422 performs the curing process of the printing ink 20A at the rear side printing completion position P1. .
[0081]
As described above, the two corona discharge electrodes 422 and 423 are integrally fixed to the ink jet head 20, so that the moving operability is good, thereby improving the wettability of the printing object and curing the printing ink. Can be performed simultaneously.
[0082]
In the above-described embodiment, when a plurality of corona discharge electrodes (including the first electrode portion and the second electrode portion) are provided, the wettability of the print object is improved and the print ink is cured. I am doing so. However, the present invention is not limited to this, and even when a plurality of corona discharge electrodes are provided, it is a matter of course that only the process of improving the wettability of the print object or the process of only curing the printing ink is performed. I do not care.
[0083]
FIG. 15 shows still another embodiment of the present invention. In the power source 521, an ultraviolet irradiation lamp 560 for ultraviolet irradiation is disposed in the vicinity of the inkjet head 20. Such an ultraviolet irradiation lamp 560 is supplied with power from the power source 521, and the operation unit 520 brings the ultraviolet irradiation lamp 560 close to the printing object 48 so that the printing object 48 is wetted at the planned printing position. It is possible to improve the property or to perform a curing process on the printing ink after printing.
[0084]
FIGS. 16 and 17 show still another embodiment of the present invention, in which, for example, electron beam generators 700 and 700 are provided for the power source. By using the electron beam generator 700 as described above, it is possible to improve the wettability of the ink at the print scheduled position of the print object 48 and cure the print ink at the print completion position.
[0085]
Further, instead of such an electron beam generator 700, an ozone generator may be arranged as shown in FIGS. Even in this case, by generating ozone, it is possible to improve the wettability of ink at the scheduled printing position and cure the printing ink at the printing completion position.
[0086]
In the embodiment described above, for example, in the embodiment of FIG. 11, the corona discharge electrodes 422 and 423 are directly fixed to the inkjet head 20, but not limited to this, two corona discharge electrodes are connected to the inkjet head 20. As a separate body, it is of course possible to use other driving means to move in synchronization with the inkjet head 20.
[0087]
The embodiment of the present invention can be applied to both the case where both the improvement of wettability in the printing object and the curing of the printing ink are performed, and the case where either one is performed.
[0088]
In the embodiment described above, the inkjet head can be linearly moved in the X-axis direction (second direction) and positioned, and the table can be moved and positioned in the Y-axis direction (first direction).
[0089]
However, the moving means 15 in FIG. 1 is not limited to this, and the table 46 on the printing object side remains fixed while the ink-jet head and the corona discharge means have movement capabilities in the X-axis and Y-axis directions. But of course. Conversely, the inkjet head and the corona discharge means may of course be fixed by giving the table side the ability to move in the X-axis, Y-axis and Z-axis directions.
[0090]
As a print head unit, it is of course possible to adopt other methods besides the ink jet head.
[0091]
【The invention's effect】
As described above, in the first aspect of the invention, since the corona discharge electrode of the corona discharge generating means performs corona discharge on the print object, the ink wettability of the print object to be printed by the printing means is determined. Improvements can be made and the ink can be cured (cured) after the ink has been printed. Since the wettability of the printing object with respect to the ink can be improved, the ink does not bounce or flow like a ball, and printing with good printing quality can be performed on the printing object. Further, since the ink can be cured, it is possible to prevent the ink from flowing even if the printing object is moved.
[0092]
According to a second aspect of the present invention, the corona discharge electrode is disposed in a direction perpendicular to the first direction and parallel to the second direction which is the traveling direction of the printing means. For this reason, the corona discharge electrode does not obstruct the progress of the printing means, and can discharge in the direction perpendicular to the first direction which is the feeding direction of the printing object.
[0093]
In the invention of claim 3, the corona discharge electrode performs corona discharge at the planned printing position before the printing means performs printing on the printing object. For this reason, the wettability with respect to the ink of the printing planned position can be improved before printing on the printing object.
[0094]
In the invention of claim 4, the corona discharge electrode performs corona discharge at the print completion position after the printing means performs printing on the printing object. For this reason, the ink of the printed object which has been printed can be cured by corona discharge.
[0095]
In the invention of claim 5, the first moving means sends the printing object mounting means in the feeding direction of the printing object in the first direction, and the second driving means moves the printing means in the second direction. To send to.
[0096]
According to the sixth aspect of the invention, the first electrode portion of the corona discharge electrode performs corona discharge at the scheduled print position of the print object, whereby the wettability with respect to the ink at the planned print position can be improved. The second electrode portion of the corona discharge electrode can cure the ink at the print completion position by causing the print object to corona discharge to the print completion position.
[0097]
According to the seventh aspect of the present invention, the corona discharge electrode moves in synchronization with the printing means.
[0098]
In the invention of claim 8, by using the gap adjusting device, it is possible to optimize the discharge by the corona discharge electrode corresponding to the change in the height of the printing object.
[0099]
In the ninth aspect of the invention, corona discharge can improve the wettability of the ink on the printing object and cure the ink after printing.
[0100]
According to the tenth aspect of the present invention, the ink wettability at the planned printing position can be improved by performing corona discharge at the planned printing position.
[0101]
According to the eleventh aspect of the invention, the ink can be cured at the print completion position by performing corona discharge to the print completion position of the print object.
[0102]
According to the twelfth aspect of the invention, the first electrode portion corona discharges to the planned printing position, so that the ink wettability at the planned printing position can be improved, and the second electrode portion corona discharges to the printing completion position. Thus, the ink can be cured at the print completion position.
[0103]
In the thirteenth aspect of the present invention, the ink wettability can be improved and the ink can be cured by irradiating the print target with ultraviolet rays.
[0104]
In the invention of claim 14, by irradiating the printing object with an electron beam, the ink wettability in the printing object can be improved and the ink can be cured.
[0105]
According to the fifteenth aspect of the present invention, by spraying ozone onto the print object, the ink wettability with respect to the print object can be improved and the ink can be cured.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a preferred embodiment of a printer of the present invention.
FIG. 2 is a diagram illustrating an example of a control system of the printer in FIG.
3 is a diagram illustrating a configuration example of a printing object, a table, and corona discharge generating means in the printer of FIG.
4 is a plan view showing a corona discharge electrode and the like shown in FIG.
FIG. 5 is a side view as seen from an arrow A in FIG.
FIG. 6 is a perspective view showing another embodiment of the printer of the present invention.
7 is a plan view of the printer of FIG. 6. FIG.
8 is a side view as seen from the arrow A in FIG. 7;
FIG. 9 is a perspective view showing still another embodiment of the printer of the present invention.
FIG. 10 is a diagram showing an example of a gap adjusting device for a corona discharge electrode.
FIG. 11 is a diagram showing an example of still another gap adjusting device for a corona discharge electrode.
12 is a plan view of the printer of FIG. 11. FIG.
13 is a side view seen from the arrow A in FIG.
14 is a diagram showing a state opposite to the operation state of FIG.
FIG. 15 is a diagram showing still another embodiment of a printer according to the invention.
16 is a plan view of the printer of FIG.
17 is a side view as seen from the arrow A in FIG.
[Explanation of symbols]
10 ... Printer
14: First driving means
15 ... Moving means
16: Second driving means
20 ... Inkjet head (printing means)
46 ... Table (means for mounting printing object)
48 ... Printed object
100: Corona discharge generating means
122 ... Corona discharge electrode
123 ... 1st electrode part of a corona discharge electrode
124... Second electrode part of corona discharge electrode
170 ... Gap adjusting device
X axis (second direction)
Y axis (first direction)
P ... Expected printing position
P1 ... Printing completion position

Claims (6)

A printing object mounting means for placing a printing object;
Printing means for supplying ink to the printing object mounted on the printing object mounting means for printing;
Moving means for relatively changing the positions of the printing means and the printing object when the printing means prints on the printing object;
Corona discharge generating means having a corona discharge electrode for performing corona discharge on the print object, the corona discharge electrode,
Before the printing means prints on the printing object, the first electrode part that corona discharges to the printing scheduled position of the printing object, and after the printing means prints on the printing object, the printing A printer comprising: a second electrode portion for corona discharge at a printing completion position of an object. 2. The corona discharge electrode according to claim 1, wherein the corona discharge electrode is disposed in a direction perpendicular to a first direction that is a feeding direction of the printing object and parallel to a second direction that is a traveling direction of the printing unit. Printer. The moving means is
First driving means for sending the printing object mounting means in the feeding direction of the printing object in the first direction;
3. The printer according to claim 1, further comprising: a second driving unit configured to send the printing unit in the traveling direction of the printing unit which is the second direction. The printer according to claim 1, wherein the corona discharge electrode is fixed to the printing unit and moves in synchronization with the movement of the printing unit. 5. The printer according to claim 1, wherein the corona discharge generating unit includes a gap adjusting device that adjusts a gap between the corona discharge electrode and the print object. In the printing method for printing on a printing object by printing means, corona discharge is performed on the printing object when ink is supplied to the printing object and printing is performed. And
Before the printing means prints on the printing object, corona discharge occurs at the scheduled printing position of the printing object, and after the printing means prints on the printing object, printing of the printing object is completed. Printing method that corona discharge to the position.

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