CN110733265B - Nozzle protecting device and nozzle protecting method for ink-jet printer - Google Patents
Nozzle protecting device and nozzle protecting method for ink-jet printer Download PDFInfo
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- CN110733265B CN110733265B CN201911060205.8A CN201911060205A CN110733265B CN 110733265 B CN110733265 B CN 110733265B CN 201911060205 A CN201911060205 A CN 201911060205A CN 110733265 B CN110733265 B CN 110733265B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007639 printing Methods 0.000 claims abstract description 105
- 239000007921 spray Substances 0.000 claims abstract description 101
- 238000001514 detection method Methods 0.000 claims description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000003313 weakening effect Effects 0.000 claims description 2
- 239000000976 ink Substances 0.000 description 35
- 238000007641 inkjet printing Methods 0.000 description 15
- 230000003287 optical effect Effects 0.000 description 14
- 230000033001 locomotion Effects 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 7
- 230000005855 radiation Effects 0.000 description 7
- 238000005507 spraying Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000007790 scraping Methods 0.000 description 4
- 238000003854 Surface Print Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
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- 230000003796 beauty Effects 0.000 description 1
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- 238000002508 contact lithography Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/46—Applications of alarms, e.g. responsive to approach of end of line
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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
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
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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
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16502—Printhead constructions to prevent nozzle clogging or facilitate nozzle cleaning
Landscapes
- Ink Jet (AREA)
Abstract
The invention provides a spray head protection device and a spray head protection method for an ink-jet printer, which are used for detecting the intensity of ultraviolet light irradiated upwards onto a printing trolley by a lower curing device. The invention can ensure the safety of the spray holes of the spray heads through the spray head protection device, and can prevent the spray heads from being damaged due to the fact that the curing device is cured to the spray holes of the spray heads when curing the object to be printed on the curing device.
Description
Technical Field
The invention relates to a spray head protection device and a spray head protection method for an ink-jet printer, in particular to a spray head protection device and a spray head protection method for an ink-jet printer, wherein a printing cylinder, a cone or a printing area is a cylinder/cone object.
Background
The inkjet printing technology refers to a technology of ejecting ink droplets onto an object to be printed through a head to obtain a printed image or text. The technology is non-contact printing, has the advantages of high printing speed, small pollution, suitability for various media to be printed and the like, and is widely applied to the field of industrial application. The ink-jet printing is divided into Scanning type (Scanning) ink-jet printing and one-time paper feeding imaging (Onepass) ink-jet printing according to the movement modes of the printing trolley and the object to be printed, wherein the Scanning type ink-jet printing comprises two types of roll-to-roll type ink-jet printing and platform type ink-jet printing, the printing trolley moves back and forth along the guide rail beam relative to the object to be printed in the ink-jet printing process, the object to be printed moves relatively along the direction perpendicular to the movement direction of the printing trolley, and the guide rail beam on which the printing trolley is arranged is stationary; while flatbed inkjet printing has two cases in inkjet printing applications: one is that the guide rail beam is not moved in the ink jet printing process, the printing trolley moves back and forth along the guide rail beam, and the printing platform moves relatively along the direction perpendicular to the moving direction of the printing trolley; the other is that the printing platform is stationary, the printing trolley moves back and forth along the guide rail beam relative to the object to be printed, and the printing trolley moves relatively along the direction perpendicular to the guide rail beam. And the printing trolley is stationary in the process of ink jet printing by one-time paper feeding imaging, and the object to be printed moves unidirectionally at high speed. The printing precision and the printing width of the spray head are required to be high by adopting one-time paper feeding imaging ink-jet printing, the printing precision of the spray head is required to be the printing precision of an image, and the printing width of the spray head is required to be the printing width of the image, so that the high precision is obtained in a mode of splicing the spray heads and the wider printing width is obtained in a mode of connecting the spray heads in series.
The method is generally used for printing planar objects, along with the enhancement of individuation requirements, more and more curved-surface objects also need digital printing, when the objects are cylinders, cones or areas to be printed are cylinders or cones, the conventional printing cannot be used, but an inkjet printing device special for curved-surface printing is needed, the patent 201811577354.7 discloses a curved-surface printing device, a print trolley can reciprocate along a guide rail beam, the objects to be printed are fixed on a jig below the guide rail beam to perform rotary motion around a central axis of the print trolley, a spray head on the print trolley sprays ink drops to form images and texts when the spray head passes through the areas to be printed of the objects to be printed, a curing device is arranged below the objects to be printed, the curing device irradiates the ink drops on the objects to be printed above while the spray head sprays ink, however, once the spray head is irradiated with ultraviolet rays of the ultraviolet lamp, the spray head can cause the dry ink at the positions to cause the spray hole to be blocked, and the spray head cannot normally work, and serious consequences are caused. And the printing device can be applied to printing of objects to be printed with different diameters, and the risk of collision with a spray head caused by the overhigh upper surface of the objects to be printed is prevented after the objects to be printed are firstly installed or replaced and in the printing process of the objects to be printed with the same diameter. Based on the above situation, a series of nozzle protection devices are also needed to be matched with the curved surface printing device to ensure the safe operation of the nozzle.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a nozzle protection device and a nozzle protection method for an inkjet printer, which can ensure that nozzle holes of the nozzle are not irradiated by ultraviolet light emitted by a curing device.
In order to achieve the above object, the present invention provides a nozzle protector for an inkjet printer, for detecting the intensity of ultraviolet light irradiated upward onto a print carriage by a lower curing device, wherein the nozzle protector comprises an ultraviolet sensor control board and an ultraviolet sensor, the ultraviolet sensor is mounted on the side wall of the print carriage through a sensor fixing block, an ultraviolet sensor control board is mounted above the ultraviolet sensor and on the side wall of the print carriage, the ultraviolet sensor control board is used for controlling the operation of the ultraviolet sensor, and when the detected ultraviolet intensity reaches a set trigger threshold, a control system controls the ultraviolet lamp to be turned off and printing is canceled, thereby protecting the nozzle from being irradiated by the ultraviolet lamp nozzle.
In the spray head protection device, a piece of quartz glass is arranged below the ultraviolet sensor and is used for filtering out other visible light, and meanwhile, the intensity of ultraviolet light can be weakened and used for preventing the sensing window from being damaged.
In the spray head protection device, a light source is further arranged below the ultraviolet sensor and used for self-checking of the spray head protection device.
In the above-mentioned shower nozzle protection device, ultraviolet sensor control panel and ultraviolet sensor set up in arbitrary one side of print dolly, perhaps ultraviolet sensor control panel and ultraviolet sensor set up a set of respectively on print dolly left and right sides wall.
In the above-mentioned shower nozzle protection device, the sensor fixed block can be adjusted back and forth along the Y-axis direction, namely the second direction, so that the central line of the sensing window of the ultraviolet sensor in the X-axis direction, namely the first direction, coincides with the central line of the shower nozzle in the X-axis direction, namely the first direction.
In the spray head protection device, the ultraviolet sensor is mounted on the sensor fixing block through a screw, and the ultraviolet sensor control plate is fixed on the side wall of the trolley through a screw.
In the above-mentioned shower nozzle protection device, an insulating film is arranged above the ultraviolet sensor, and the insulating film is used for preventing the screw for fixing the ultraviolet sensor from conducting electricity.
The invention provides a spray head protection method of the spray head protection device, which is characterized by comprising the following steps:
a) A nozzle protection device is arranged on the side wall of the printing trolley and the position of an induction window on the ultraviolet sensor is adjusted;
b) Pressing a printer starting button, and automatically checking whether the feedback of the ultraviolet sensor is in a normal working state or not by the ultraviolet sensor;
c) After the self-test is normal, the ultraviolet sensor starts to detect the intensity of ultraviolet light below;
d) The ultraviolet sensor judges and feeds back the detection result to the sensor control board: if the intensity of the ultraviolet rays received by the sensing window of the ultraviolet sensor reaches a preset threshold value, the ultraviolet lamp is turned off, and printing is canceled; if the intensity of the ultraviolet light received by the sensing window of the ultraviolet light sensor does not reach a preset threshold value, the ink-jet printer works normally.
In the above-mentioned spray head protection method, the adjusting the position of the sensing window of the ultraviolet sensor in step a) specifically includes: the sensor fixing block is adjusted along the Y-axis direction, namely the second direction, so that the central line of the sensing window of the ultraviolet sensor in the X-axis direction, namely the first direction, is overlapped with the central line of the spray head in the X-axis direction, namely the first direction.
In the above-mentioned spray head protection method, the step c) of detecting the intensity of the ultraviolet light below includes a stage of approaching the print carriage to the curing device below before printing, a stage of separating the print carriage from the curing device during printing and after printing.
In the above-mentioned spray head protection method, the preset threshold value in step d) may be changed according to actual situations.
The invention uses the spray head protection device, can prevent the ultraviolet rays emitted or reflected upwards by the curing device from accumulating to a certain intensity and then irradiating the spray head spray holes in the process of curing the object to be printed above by the curing device, prevent the spray head spray holes from being blocked due to the accumulation of ultraviolet light rays, and ensure the safe operation of the spray head.
Drawings
FIG. 1 is a schematic perspective view of an ink jet printer according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the internal structure of the ink-jet printer of FIG. 1 after the cover 7 is hidden;
FIG. 3 is a schematic perspective view of a core portion of an embodiment of the present invention;
FIG. 4 is a schematic perspective view of an ultraviolet light safety inspection device in a curing apparatus according to an embodiment of the invention;
FIG. 5 is a schematic perspective view of a print carriage according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of the hidden sensor cover 11 of FIG. 5 according to the present invention;
FIG. 7 is a schematic perspective view of the hidden sensor block 20 of FIG. 6 according to the present invention;
FIG. 8 is a bottom view of a print carriage in one embodiment of the invention;
FIG. 9 is a schematic view showing a mounting structure of a head protection device according to another embodiment of the present invention;
fig. 10 is a schematic view showing the internal structure of the core part of the ink jet protection device of fig. 9 according to the present invention.
In the figure: the printing carriage 1, the printing beam 2, the wiping maintenance device 3, the object to be printed mounting mechanism 4, the curing device 5, the base portion 6, the housing 7, the elevating device 8, the object to be printed 0, the head 10, the sensor cover plate 11, the ultraviolet sensor control board 12, the ultraviolet sensor 13, the quartz glass 14, the ultraviolet 15, the emission signal 16, the receiving signal 17, the object to be printed initial position sensor 18, the initial position sensor moving block 19, the sensor fixing block 20, the altimeter sensor emission end 21, the slide table 22, the aluminum profile 23, the insulating film 130, the slide block 50, the first ultraviolet lamp 51, the second ultraviolet lamp 52, the ultraviolet lamp connecting plate 53, the light shielding side plate 54, the light shielding cover plate 55, the first optical axis 56, the second optical axis 57, the ultraviolet light safety detection sensor 58, the signal 580, the side shutter 59, the transparent object detection sensor receiving end 61, the head protection mechanism 9, the sensor 91, the sensor reflection end 92, the lead screw motor 93, the first limit switch 94, the second limit switch 95, the slide block 96, the guide rail 97, and the sensor cover plate 98 and the sensor 99.
Detailed Description
The head protection device and the head protection method for an inkjet printer according to the present invention will be described in detail with reference to the accompanying drawings.
First, an inkjet printer of the present invention is described, and as shown in fig. 1 and 2, the inkjet printer of the present invention includes a print carriage 1, a print beam 2, a wiping maintenance device 3, an object to be printed mounting mechanism 4, a curing device 5, a base portion 6, a housing 7, and a control system (not shown in the drawings). An object mounting mechanism 4 to be printed is arranged above the middle of the base part 6, the object mounting mechanism 4 to be printed is used for fixedly mounting an object to be printed, a curing device 5 is arranged below the object mounting mechanism 4 to be printed, the curing device 5 is used for carrying out irradiation curing treatment on ink drops sprayed on the object to be printed, a printing cross beam 2 is arranged above the object mounting mechanism 4 to be printed, a printing trolley 1 is arranged on the printing cross beam 2, the printing trolley 1 can reciprocate along the printing cross beam 2, namely the X-axis direction (first direction), an ink scraping maintenance device 3 is arranged below the initial position of the printing trolley, the ink scraping maintenance device 3 is used for carrying out ink scraping operation or moisturizing maintenance operation on a spray head on the printing trolley 1, and the components are covered by an outer cover 7, so that the machine is attractive. The control system is used for controlling the normal and orderly work of the ink-jet printer, and the specific working process of the ink-jet printer is as follows: the operator firstly fixedly installs an object to be printed on the object mounting mechanism 4 to be printed, wherein the object to be printed can be a cylinder or a cone, and can also be an object with a printing area of a cylinder or a cone. It should be noted that the diameter of the object to be printed can be changed, and the design of the jig can not only mount objects to be printed with different lengths and diameters, but also adjust the parallelism of the upper surface of the object to be printed for printing objects to be printed with different conicity; then adjusting the distance between the upper surface of the object to be printed and the plane of the spray hole of the spray head to be the optimal printing distance, and adjusting the distance between the upper surface of the object to be printed and the plane of the spray hole of the spray head to be the optimal printing distance, wherein the distance between the upper surface of the object to be printed and the plane of the spray hole of the spray head is usually 1-3 mm; then, the operator presses the start button, the print carriage 1 starts to move from the initial position along the X-axis direction, i.e., the first direction, toward the opposite side, the object to be printed rotates around the central axis of the print carriage, when the print carriage 1 passes over the image-text area to be printed on the object to be printed, ink drops are ejected to the object to be printed to form images and texts, and simultaneously, the curing device 5 below the object to be printed irradiates ultraviolet rays upwards, and curing treatment is performed on the ejected ink drops. After passing through the object to be printed for one pass, the printing trolley 1 finishes all the printing of the graphics context; finally, the carriage returns from the end position to the initial position along the X-axis direction, i.e. the first direction. After waiting for the next object to be printed to be replaced, the operator presses the start button again, and the inkjet printer continues to repeat the above-described working process to print the object to be printed.
In this embodiment, as shown in fig. 8, four nozzles 10 are installed, and the nozzles 10 are sequentially connected in series along their length direction (X-axis direction/first direction), that is, the connecting line direction of the four nozzles connected in series is parallel to the rotation center axis direction of the object to be printed, each nozzle can print two colors, the first nozzle on the left is used for spraying coating ink such as white (W) ink or pre-treated viscous ink (P), or spraying coating ink according to actual needs, the middle two nozzles are used for spraying magenta (M), yellow (Y), cyan (C) ink and black (K) ink, and the right nozzle is used as a spare nozzle, and can be used for spraying transparent (V) ink, or spraying other colored ink or non-spraying ink. The spray head arrangement mode is matched with motion control and software control, so that the spray painting of all pictures and texts can be completed after the printing trolley passes through the area to be printed once along the X-axis direction in the process of uniformly rotating the object to be printed around the central axis of the object to be printed, and the printing efficiency is improved. An ink cartridge for containing ink and a corresponding negative pressure control system may be provided on the carriage 1. The ink used by the spray head of the invention is Ultraviolet (UV) ink, and the ultraviolet curing lamp is arranged below the object to be printed to dry and cure the ink. The invention can also be provided with other numbers of spray heads, and the arrangement sequence of the inks with different colors can be determined according to actual requirements, and the application is not particularly limited.
Since the curing device 5 is disposed below the object to be printed, the print nozzle is disposed above the object to be printed to eject ink, and the ink drops are cured in real time while ejecting ink, it is necessary to ensure that the ultraviolet light emitted by the curing device 5 is completely blocked and cannot irradiate the nozzle holes of the nozzle, otherwise, the nozzle holes are blocked by drying, and the nozzle is damaged. The invention installs two sets of devices for protecting spray heads at the curing device 5 for avoiding the irradiation of the spray heads:
one set is an ultraviolet light safety detection device. As shown in fig. 3 to 4, the curing device 5 of the present invention includes a first ultraviolet lamp 51 and a second ultraviolet lamp 52, the first ultraviolet lamp 51 and the second ultraviolet lamp 52 are arranged side by side in the X-axis direction, i.e., the first direction, below the object 0 to be printed, the first ultraviolet lamp 51 and the second ultraviolet lamp 52 are connected by an ultraviolet lamp connecting plate 53, a side shield 59 is provided on the outside of the broad side of the first ultraviolet lamp 51, and a light shielding side plate 54 is provided on the outside of the broad side of the second ultraviolet lamp 52. An ultraviolet light safety detection device is arranged on the curing device 5, the ultraviolet light safety detection device comprises a sliding block 50, a shading cover plate 55, a first optical axis 56, a second optical axis 57 and an ultraviolet light safety detection sensor 58, the first optical axis 56 and the second optical axis 57 are arranged above the first ultraviolet lamp 51 and the second ultraviolet lamp 52 along the long side direction (first direction), one end of the first optical axis 56 and one end of the second optical axis 57 are arranged in a side baffle 59, the other end of the first optical axis 56 and the second optical axis 57 are arranged in a shading side plate 54, the sliding block 50 penetrates through the first optical axis 56 and the second optical axis 57, the sliding block 50 can slide along the first optical axis 56 and the second optical axis 57, the shading cover plate 55 is arranged on the sliding block 50, the other end of the shading cover plate 55 is arranged at the shading side plate 54, the light shielding cover plate 55 is a flexible light-tight strip coiled material, and can move along the upper parts of the first ultraviolet lamp 51 and the second ultraviolet lamp 52 along with the movement of the sliding block 50, when the sliding block 50 is pulled from a starting end (one end of the light shielding side plate 54 in the figure) to a final end (one end of the side baffle plate 59 in the figure), the light shielding cover plate 55 completely shields the lamp beads of the two ultraviolet lamps, when the sliding block 50 is pulled from the final end (one end of the side baffle plate 59 in the figure) to the starting end (one end of the light shielding side plate 54 in the figure), the light shielding cover plate 55 is gradually opened and gradually leaks out of the ultraviolet lamps below, and the sliding position of the sliding block 50/the light shielding cover plate 55 is adjusted according to the length to be cured of the image to be printed before ink-jet printing, so that the curing range exposed upwards by the curing device is the spray pattern area on the object to be printed. An ultraviolet light safety detection sensor 58 is mounted above the slider 50, and the ultraviolet light safety detection sensor 58 of the present embodiment emits a signal 580 upward. The ultraviolet light safety detection device is applied to the printing process, when the ultraviolet light safety detection sensor 58 detects that the signal 580 is blocked, the object 0 to be printed is positioned above the irradiation area of the ultraviolet lamp, ultraviolet light emitted by the ultraviolet lamp is effectively blocked, and at the moment, the spray head of the printing trolley is in a safe state, so that other operations can be performed; when the ultraviolet light safety detection sensor 58 detects that the signal 580 is not shielded, it indicates that the object 0 to be printed does not completely shield the area irradiated by the ultraviolet light, at this time, ultraviolet light irradiates upwards, if the print trolley passes through the area, the spray hole is directly irradiated, and there is a risk of being damaged by drying, so that the spray head of the print trolley is in an unsafe state, the control system controls the ultraviolet light to be turned off, printing is canceled, the print trolley returns to the initial position of printing, and meanwhile, the screen of the printer alarms to prompt that the position of the ultraviolet light shielding cover plate is wrong, and correction is requested, otherwise, the spray head is damaged.
The other set is a transparent object detection device, if the object to be printed is transparent, ultraviolet rays emitted by the curing device 5 below can directly irradiate the spray holes of the spray heads to cause dry and block of the spray holes, so that the curing device can be in a normal irradiation state only after the object to be printed is a non-transparent object or the transparent object is subjected to shading treatment. The transparent object detection device includes a transparent object detection sensor transmitting end and a transparent object detection sensor receiving end 61 (as shown in fig. 2), the transparent object detection sensor transmitting end is disposed on a supporting plate (not shown in the figure) below the object mounting mechanism 4 to be printed, and is located below the object to be printed, the transparent object detection sensor transmitting end transmits light beams upwards, and a transparent object detection sensor receiving end 61 is installed inside the top end housing of the printer housing 7 corresponding to the transparent object detection sensor transmitting end for receiving the light beams transmitted by the sensor transmitting end below the object to be printed. If the object to be printed is a non-transparent object or is a transparent object but is subjected to shielding treatment (such as a non-transparent substance is plugged into the transparent object), at this time, the light beam emitted by the transmitting end of the transparent object detection sensor is shielded, the receiving end 61 of the transparent object detection sensor cannot receive a signal, so that the light transmission state of the object to be printed is normal, other operations can be performed through feedback, and the control system controls the curing device to work normally and the printing operation to be performed normally; if the object to be printed is a transparent object, the light beam emitted by the emitting end of the transparent object detection sensor is not blocked and is directly received by the receiving end 61 of the transparent object detection sensor, the fact that no object to be printed reaches the printing position or the object to be printed is transparent and is not subjected to light-proof treatment is indicated, the spray nozzle is in a dangerous state, if printing is continued, ultraviolet light emitted by the curing device 5 can penetrate through the object to be printed and directly irradiate the spray nozzle to cause dry and hard damage of the spray nozzle, at the moment, the control system controls the ultraviolet lamp to be closed and cancel printing, the printing trolley returns to the printing starting position, and meanwhile, the screen of the printer alarms to prompt that the bottle is transparent and the printing is dangerous.
In addition to the above-described two sets of devices for protecting the spray heads mounted on the curing device 5, an ultraviolet irradiation device is further provided on the print carriage 1, and the ultraviolet irradiation device provided on the print carriage 1 will be described below. As shown in fig. 5, the ultraviolet irradiation device is provided on the left side of the carriage, and is covered by the outer cover 7, thereby facilitating the beauty. As shown in fig. 6 to 8, the ultraviolet radiation preventing device includes an ultraviolet sensor control board 12 and an ultraviolet sensor 13, the ultraviolet sensor 13 is mounted on the side wall of the carriage 1 through a sensor fixing block 20, and the sensor fixing block 20 is adjustable back and forth along the Y-axis direction, i.e., the second direction, so that the center line of the sensing window of the ultraviolet sensor 13 in the X-axis direction (first direction) coincides with the center line of the head in the X-axis direction (first direction). An ultraviolet sensor control board 12 is also installed on the side wall of the print carriage 1 above the ultraviolet sensor 13, and the ultraviolet sensor control board 12 is used for controlling the operation of the ultraviolet sensor 13. A quartz glass 14 is arranged below the ultraviolet sensor 13, and the quartz glass 14 is used for filtering out other visible light and weakening the intensity of ultraviolet light to prevent the sensing window from being damaged when the light intensity is too high. An insulating film 130 is provided above the ultraviolet sensor 13 to prevent conduction with a screw fixing the ultraviolet sensor 13.
The ultraviolet sensor 13 converts ultraviolet signals into electric signals by using a photosensitive element, a sensing window at the lower end of the ultraviolet sensor receives the irradiation of ultraviolet lamps in a curing device below, once ultraviolet rays 15 emitted by the ultraviolet lamps leak upwards and reach a trigger threshold value (the threshold value can be changed according to actual conditions and test result settings) set by the ultraviolet sensor 13, the trigger threshold value is fed back to the ultraviolet sensor control board 12 by the ultraviolet sensor 13, at the moment, a control system controls the ultraviolet lamps to be closed and cancel printing, a printing trolley returns to a printing starting position, and meanwhile, a printer screen alarms and prompts that the ultraviolet rays are detected to be leaked, correction is requested, or the printing is damaged.
In order to ensure the normal operation of the ultraviolet irradiation prevention device, a self-checking procedure is also arranged after the machine is started. The specific arrangement is as follows: an upward-irradiation light source is arranged at the lower end of the induction window of the ultraviolet sensor 13, after the machine is started, a light beam emitted by the light source irradiates the induction window of the ultraviolet sensor 13 through quartz glass 14, and the light beam can be received and fed back by the ultraviolet sensor 13 and can be ensured that the irradiation intensity can not damage a spray head. If the ultraviolet radiation device works normally, the light source signal is received and the ultraviolet radiation device is fed back to be in a normal working state after self-inspection, so that the printer can continue to work normally; if the ultraviolet radiation device cannot receive the light source signal for feedback, the ultraviolet sensor 13 or the ultraviolet sensor control board 12 may be damaged, or the quartz glass 14 may be blurred to affect the receiving of the sensing window, and at this time, the operation should be restarted after the failure of the ultraviolet radiation device is eliminated.
When the ultraviolet sensor 13 is installed, the ultraviolet sensor 13 is firstly installed on the side wall of the printing trolley 1, and then the sensor fixing block 20 is adjusted along the Y-axis direction, namely the second direction, so that the central line of the sensing window of the ultraviolet sensor 13 in the X-axis direction (the first direction) coincides with the central line of the spray head in the X-axis direction (the first direction). The specific working process is as follows: after a printer start button is pressed, the ultraviolet sensor 13 is powered on, a light source below the ultraviolet sensor 13 is lightened, the ultraviolet sensor 13 feeds back whether the printer is in a normal working state or not through self-checking, if yes, the printer continues to work, and if no, the ultraviolet-proof irradiation device continues to work after the fault is removed; after the self-check is normal, the ultraviolet sensor 13 starts to detect the ultraviolet light intensity below, and the detection process comprises a stage that the printing trolley is close to the curing device below before printing, a stage that the printing trolley is far away from the curing device after printing and a stage that the printing trolley is in the process of printing. The ultraviolet sensor judges the detection result and feeds back the detection result to the sensor control board: if the intensity of ultraviolet rays received by the sensing window of the ultraviolet sensor reaches a preset threshold value, the ultraviolet lamp is turned off, printing is canceled, and the printing trolley returns to the printing starting position; if the intensity of the ultraviolet light received by the sensing window of the ultraviolet light sensor does not reach a preset threshold value, the ink-jet printer works normally. By sensing the intensity of the ultraviolet rays, the phenomenon that the spray nozzle is blocked and damaged due to the fact that the upward leaked light of the curing device irradiates the spray nozzle orifice can be prevented.
It should be noted that, except for the case that the ultraviolet radiation protection device is disposed at one side of the print carriage in the embodiment of the drawings, the ultraviolet radiation protection device may be disposed on two sides of the print carriage, or disposed at the other side of the print carriage, and the working principle is the same according to the print mode without departing from the protection scope of the present invention.
In addition, an object initial position detection device to be printed is further arranged on the left side wall of the printing trolley 1, and as shown in fig. 5, the object initial position detection device to be printed is covered by the outer cover 7, so that the printing trolley is attractive in appearance. As shown in fig. 6 to 8, the device for detecting the initial position of the object to be printed includes an initial position sensor 18 and an initial position sensor moving block 19, the initial position sensor 18 is mounted below the initial position sensor moving block 19 by a screw, the initial position sensor moving block 19 is mounted on the sensor fixed block 20, a slot hole with adjustable position is provided on the initial position sensor moving block 19, the initial position sensor moving block 19 can drive the initial position sensor 18 of the object to be printed to move along the Y axis direction, so as to adjust the detection window of the initial position sensor 18 of the object to be printed to correspond to the width direction of the nozzle 10, the initial position sensor 18 of the object to be printed sends out an emission signal 16 when working, when the print carriage 1 moves along the X axis direction (first direction), after encountering the bottom of the object to be printed below, the emission signal 16 is reflected back by the bottom of the object to be printed, the initial position sensor 18 of the object to be printed receives a receiving signal 17 returned, detects the initial end of the object to be printed, then calculates the distance from the initial end to be printed from the image area to be printed to the initial end to be printed, and sets a preset image-text and text ink jet position to be dispensed from the nozzle, and image and text ink jet can be dispensed, and ink jet can be accurately set.
After the objects to be printed with the same size are installed for the first time, when an operator needs to adjust the distance between the upper surface of the objects to be printed and the plane where the spray holes of the spray heads are located to be the optimal printing distance of 1-3mm, the lifting height of the installation mechanism 4 of the objects to be printed is usually adjusted, so that the optimal printing distance is ensured. Since the height of the object to be printed needs to be lifted and changed, a set of nozzle protection device for ensuring that the nozzle is prevented from being collided by the object to be printed is also needed, which is called a nozzle collision-free protection device, as shown in fig. 2, the nozzle collision-free protection device comprises a height sensor transmitting end 21, a sliding table 22, an aluminum profile 23 and a height sensor receiving end (not shown in the figure), wherein the aluminum profile 23 is arranged on the printing cross beam 2 through an angle joint and is perpendicular to the printing cross beam 2 along the Y axis direction, namely, the second direction, a sliding table 22 is arranged on the aluminum profile 23, the sliding table 22 can adjust along a groove in the aluminum profile 23 along the Y axis direction, namely, the second direction, the height sensor transmitting end 21 is arranged on the sliding table 22, the height sensor transmitting end 21 can perform lifting movement along with the sliding table 22 along the Z axis direction, the other side of the height sensor transmitting end 21 is correspondingly provided with the height sensor receiving end, and the height sensor receiving end is arranged on the inner side wall of the outer cover 7. When the collision-free protection device of the spray head is installed, the height of the light beam emitted by the height measurement sensor is adjusted to be positioned at a position slightly below the plane of the spray hole of the spray head. Then the height of the object to be printed mounting mechanism 4 is adjusted according to the diameter of the object to be printed, and the specific process is as follows: the lifting device below the object to be printed mounting mechanism 4 controls the object to be printed to ascend and shade the light beam emitted by the emission end 21 of the height measurement sensor, then the lifting device controls the object to be printed to descend to a trigger position away from the light beam, and then the object to be printed is controlled to continuously descend for a preset distance to reach the optimal printing height from the plane of the spray hole of the spray head. After the next object to be printed is replaced or in the printing process, when the object to be printed shields rays between the height measuring sensors, the upper surface height of the object to be printed is indicated to form threat to the spray head, at the moment, the movement of the printing trolley is stopped, the screen alarms and prompts that the medium is too high, so that the object to be printed is prevented from colliding with the spray head; when the object to be printed does not shade rays between the height measuring sensors, the upper surface of the object to be printed is lower than the plane where the spray holes of the spray heads are located, the spray heads are safe relative to the object to be printed, and the printing trolley can continue to move to the position above the object to be printed and cannot collide with the spray heads.
In addition to the above-described embodiments, the lifting of the object to be printed mounting mechanism 4 is adjusted, and the distance between the upper surface of the object to be printed and the plane of the nozzle hole of the nozzle can be adjusted to be the optimal printing distance by adjusting the lifting of the print carriage 1. As shown in fig. 9 to 10, when the height of the object to be printed is not adjustable and the print carriage 1 is designed to be adjustable and raised, since the diameter of each batch of the object to be printed may vary, a set of nozzle protection mechanism 9 which can be raised and lowered with the print carriage 1 is required to ensure that the bottom surface of the nozzle is not scratched by the object to be printed 0 when the object to be printed 0 of a certain size is first installed or replaced. The nozzle protection mechanism 9 includes a sensor 91, a sensor reflecting end 92, a screw motor 93, a first limit switch 94, a second limit switch 95, a slider 96, a guide rail 97, and a sensor cover 98, where the sensor 91 in this embodiment is illustrated as a laser ranging sensor, and may be any other sensor, which is not limited in this invention. The sensor 91 is mounted on a screw rod of the screw rod motor 93 through a bracket (not shown in the figure), the screw rod motor 93 can drive the sensor 91 to move up and down along the vertical direction, namely the Z-axis direction, the lowest end of the lifting range is provided with the first limit switch 94 for limiting, the highest end of the lifting range is provided with the second limit switch 95 for limiting, the bracket connected with the sensor 91 is also connected with a sliding block 96, the sliding block 96 moves along a guide rail 97, the guide rail 97 is arranged along the vertical direction, namely the Z-axis direction, a guide effect is achieved, a transmitting hole 99 is formed in the sensor cover plate 98, the transmitting hole 99 is a vertically arranged long hole, and a light beam 90 emitted by the transmitting end of the sensor 91 can irradiate the opposite sensor reflecting end 92 through the transmitting hole 99. If the object to be printed is higher than the light beam 90, i.e. the object to be printed is blocked between the sensor 91 and the sensor reflecting end 92, the sensor 91 is triggered; if there is no occlusion of the object to be printed between the sensor 91 and the sensor reflective end 92, the sensor 91 is not triggered. There is also an advantage in using a laser ranging sensor: according to the principle of the laser ranging sensor and the arrangement of software, information false alarm generated by shielding the light beam 90 when the ink scraping maintenance operation is carried out on the spray head can be shielded, and even if the spray head is manually wiped or automatically scraped for maintenance after the spray head is started, alarm can not be generated due to shielding the light beam 90.
It should be noted that, the sensor 91 may also be a common laser sensor, where the sensor reflecting end 92 is configured to receive the light beam, and may be a receiving board covering the lifting range of the light beam emitted by the sensor emitting end 91, or may be a receiving device that lifts and lowers synchronously along with the lifting of the sensor emitting end 91, which is not limited in this aspect of the invention.
The function of the head protection mechanism 9 includes two aspects: on the one hand, after a batch of objects to be printed are installed and before a printing job, measuring and calculating the distance from the printing trolley to the printing position; on the other hand, during the printing operation, the upper surface of the object to be printed is prevented from exceeding the safety height to collide with the spray head.
The detection working process of the nozzle protection mechanism 9 after the object to be printed is installed and before the printing operation is as follows: firstly, the print carriage 1 and the sensor 91 are lifted to the highest initial position along the vertical direction, and then the sensor 91 detects the distance difference in the vertical direction between the plane height of the spray hole when the print carriage 1 is at the highest position and the height of the light beam emitted when the sensor 91 is at the highest position through movement, wherein the distance difference is denoted as h; secondly, the control system controls the sensor 91 to move downwards in the vertical direction, after the emitted light beam 90 is blocked by an object to be printed, the control system controls the sensor 91 to stop moving, and then controls the sensor 91 to move upwards to a detection position suitable for printing safety (the detection position suitable for printing safety is related to the characteristics of the sensor, such as the width of a light spot), and the distance from the highest position to the detection position of the sensor 91 is recorded as H; third, according to the distances H and H detected by the sensor 91 and the optimal printing distance between the plane of the nozzle hole of the nozzle and the upper surface of the object to be printed, the software calculates the height of the print carriage 1 to be lowered, and the control system controls the print carriage 1 to be lowered from the highest position along the vertical direction. In this embodiment, the light beam 90 emitted by the sensor 91 is a light spot with a height of 6mm, the 1/3 area at the upper part of the light spot (i.e. the upper 2mm area) is higher than the plane of the nozzle hole of the nozzle, the 1/3 area at the lower part of the light spot (i.e. the lower 2mm area) is lower than the upper surface of the object to be printed, and the 1/3 area at the middle part of the light spot (i.e. the middle 2mm area) is an effective detection light beam.
In the printing process, the principle of the protection operation of the nozzle protection mechanism 9 is as follows: when the object to be printed triggers the detection light beam of the sensor 91, the spray head is in a dangerous state and possibly is collided by the object to be printed, at the moment, the control system controls the printing trolley 1 to stop suddenly, and the screen alarms and prompts that the medium is too high; if the effective detection beam of the sensor 91 is not triggered, indicating that the height of the object to be printed is safe with respect to the head, the carriage 1 continues to operate normally.
When the objects to be printed with different diameters are replaced, the sensors 91 in the print carriage 1 and the spray head protection mechanism 9 need to be lifted to the highest starting position, the spray head protection mechanism 9 needs to repeat the detection working process again, the software calculates the distance that the print carriage should descend, the control system controls the print carriage to descend to a proper printing position, and then the spray head protection mechanism 9 performs the protection work in the printing process.
It should be noted that any modifications made to the embodiments according to the present invention do not depart from the spirit of the invention and the scope of the present invention as set forth in the appended claims.
Claims (9)
1. A spray head protection device for an ink jet printer is used for detecting ultraviolet intensity of spray heads irradiated upwards to a print trolley by a lower curing device and is characterized by comprising an ultraviolet sensor control board and an ultraviolet sensor, wherein the ultraviolet sensor is arranged on the side wall of the print trolley through a sensor fixing block, the ultraviolet sensor control board is arranged above the ultraviolet sensor and on the side wall of the print trolley and used for controlling the operation of the ultraviolet sensor, when the detected ultraviolet intensity reaches a set trigger threshold value, a control system controls an ultraviolet lamp to be turned off and printing is canceled, so that the spray heads are protected from being irradiated by the ultraviolet lamp to spray holes, and the ultraviolet sensor control board and the ultraviolet sensor are arranged on any side of the print trolley or are respectively arranged on the left side wall and the right side wall of the print trolley.
2. The head protection device of claim 1, wherein a quartz glass is disposed under the ultraviolet sensor, the quartz glass being used to filter out other visible light while weakening the intensity of ultraviolet light to prevent the sensing window from being damaged.
3. The spray head protection device of claim 1, wherein a light source is further disposed below the ultraviolet sensor for self-inspection of the spray head protection device.
4. The head protection device according to claim 1, wherein the sensor fixing block is adjustable back and forth along a Y-axis direction, i.e., a second direction, so that a center line of the sensing window of the ultraviolet sensor in the X-axis direction, i.e., a first direction, coincides with a center line of the head in the X-axis direction, i.e., a first direction.
5. The spray head protection device of claim 1, wherein the ultraviolet sensor is mounted to the sensor fixing block by a screw, and the ultraviolet sensor control board is fixed to the side wall of the trolley by a screw.
6. The head protection device of claim 1, wherein an insulating film is disposed above the ultraviolet sensor, the insulating film being configured to prevent electrical conduction with a screw to which the ultraviolet sensor is fixed.
7. A head protection method of the head protection device according to claim 1, comprising the steps of:
a) A nozzle protection device is arranged on the side wall of the printing trolley and the position of an induction window on the ultraviolet sensor is adjusted;
b) Pressing a printer starting button, and automatically checking whether the feedback of the ultraviolet sensor is in a normal working state or not by the ultraviolet sensor;
c) After the self-test is normal, the ultraviolet sensor starts to detect the intensity of ultraviolet light below;
d) The ultraviolet sensor judges and feeds back the detection result to the sensor control board: if the intensity of the ultraviolet rays received by the sensing window of the ultraviolet sensor reaches a preset threshold value, the ultraviolet lamp is turned off, and printing is canceled; if the intensity of the ultraviolet light received by the sensing window of the ultraviolet light sensor does not reach a preset threshold value, the ink-jet printer works normally.
8. The head protection method of the head protection device according to claim 7, wherein the adjusting the position of the sensing window of the ultraviolet sensor in the step a) is specifically: the sensor fixing block is adjusted along the Y-axis direction, namely the second direction, so that the central line of the sensing window of the ultraviolet sensor in the X-axis direction, namely the first direction, is overlapped with the central line of the spray head in the X-axis direction, namely the first direction.
9. The head protection method of the head protection device according to claim 7, wherein the process of detecting the intensity of the ultraviolet light below in the step c) includes a stage of approaching the print carriage to the curing device below before printing, a stage of separating the print carriage from the curing device during printing, and a stage of separating the print carriage from the curing device after printing; the preset threshold value in step d) may be changed according to actual conditions.
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| CN113199757B (en) * | 2021-05-11 | 2021-12-31 | 广东省珠海市质量计量监督检测所 | 3D printing nozzle capable of detecting and correcting and method for realizing correction printing |
| CN114248567A (en) * | 2021-12-17 | 2022-03-29 | 东莞市启思达智能技术有限公司 | Laser protection device, method and system |
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