CN211280306U

CN211280306U - Spray head protection device for ink-jet printer

Info

Publication number: CN211280306U
Application number: CN201921869395.3U
Authority: CN
Inventors: 张原�; 张征宇
Original assignee: Beijing Yameike Software Co ltd
Current assignee: Beijing Yameike Software Co ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-08-18
Anticipated expiration: 2029-11-01

Abstract

The utility model provides a shower nozzle protection device for ink jet printer, the setting is in solidification equipment top, shower nozzle protection device includes the sliding block, the shading apron, first optical axis, second optical axis and ultraviolet ray safety inspection sensor, set up first optical axis and second optical axis along the first direction in solidification equipment top, first optical axis and second optical axis cover solidification equipment's length direction and fixed at the width direction of solidification equipment both sides respectively, pass a sliding block on first optical axis and second optical axis, first optical axis and second optical axis slip can be followed to the sliding block, an installation shading apron can remove along with the sliding block on the sliding block, an ultraviolet ray safety inspection sensor is installed to the top of sliding block, thereby be used for detecting the top and treat that the printing object shelters from and ensure that the shower nozzle avoids being shone. The utility model discloses a shower nozzle protection device can ensure the safety of shower nozzle orifice, can prevent that solidification equipment from solidifying the shower nozzle orifice and then causing the shower nozzle to damage when treating the printing object on it.

Description

Spray head protection device for ink-jet printer

Technical Field

The utility model relates to a shower nozzle protection device for ink jet printer, concretely says so and relates to print cylinder, cone or print regional for cylinder/for the ink jet printer shower nozzle protection device of circular cone object.

Background

The ink jet printing technology is a technology of obtaining a printed image or text by ejecting ink droplets onto an object to be printed through an ejection head. The technology is non-contact printing, has the advantages of high printing speed, small pollution, adaptability to 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 (One-pass) 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 roll-to-roll 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 vertical to the movement direction of the printing trolley, and the guide rail beam provided with the printing trolley is static; whereas flatbed inkjet printing has two cases in inkjet printing applications: one is that the guide rail beam is fixed 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 vertical 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 in a direction perpendicular to the guide rail beam. And the printing trolley is still during the ink-jet process of the one-time paper feeding imaging ink-jet printing, and the object to be printed moves in a unidirectional high speed. The requirement on the printing precision and the printing width of the spray head is high by adopting one-time paper feeding imaging ink-jet printing, the printing precision of the spray head needs to be the printing precision of an image, the printing width of the spray head needs to be the printing width of the image, and the high precision is obtained by splicing the spray heads and the wider printing width is obtained by connecting the spray heads in series.

The method is generally used for printing plane objects, more and more curved objects need digital printing along with the enhancement of personalized requirements, when the objects are cylinders, cones or the areas to be printed are cylinders or cones, the objects cannot be printed by using the conventional mode, but an ink-jet printing device special for curved surface printing is needed, the invention patent 201811577354.7 discloses a curved surface printing device, a printing trolley can reciprocate along a guide rail beam, the objects to be printed are fixed on a jig below the guide rail beam to rotate around a central shaft of the printing trolley, a nozzle on the printing trolley sprays ink droplets to form images and texts when passing through the areas to be printed of the objects to be printed, a curing device is arranged below the objects to be printed, and the curing device irradiates the ink droplets on the objects to be printed above the nozzle with an ultraviolet lamp while the nozzle sprays ink, however, ultraviolet light of the ultraviolet lamp cannot irradiate the nozzle hole of the nozzle, and once the nozzle hole of the nozzle is irradiated, ink at the nozzle hole may be dried to block the nozzle hole, so that the nozzle is damaged, the printing device cannot work normally, and serious consequences are caused. Moreover, the printing device can be applied to printing of objects to be printed with different diameters, and after the objects to be printed are installed for the first time or the objects to be printed with different diameters are replaced, and in the printing process of each object to be printed with the same diameter, the danger that the upper surface of the object to be printed is too high to cause collision with the spray head is prevented. Based on the above situation, a series of nozzle protection devices are required to be matched with the curved surface printing device to ensure the safe operation of the nozzles.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model aims to provide a can ensure that the shower nozzle orifice avoids the ultraviolet irradiation's that the solidification equipment sent shower nozzle protection device for inkjet printer.

In order to realize the purpose, the utility model provides a spray head protection device for an ink-jet printer, which is arranged above a curing device, it is characterized in that the spray head protection device comprises a sliding block, a shading cover plate, a first optical axis, a second optical axis and an ultraviolet light safety detection sensor, arranging a first optical axis and a second optical axis along a first direction above the curing device, covering the length direction of the curing device and fixing the end parts, pass a sliding block on first optical axis and second optical axis, the sliding block can be followed first optical axis and second optical axis and slided, installs a shading apron on the sliding block, and shading apron can carry out the sheltering from of different distances to solidification equipment along with the sliding block removes, and an ultraviolet ray safety inspection sensor is installed to the top of sliding block for it has to wait to print the object and shelters from thereby ensures that the shower nozzle avoids being shone to detect the top.

In the spray head protection device, the curing device is composed of an ultraviolet lamp and is used for curing an object to be printed above.

In the spray head protection device, the printing cross beam is arranged above the object to be printed, and the printing trolley on the printing cross beam performs image-text spray painting on the object to be printed when passing above the object to be printed.

In the spray head protection device, the ultraviolet lamps comprise a first ultraviolet lamp and a second ultraviolet lamp, and the first ultraviolet lamp and the second ultraviolet lamp are connected through an ultraviolet lamp connecting plate.

In the spray head protection device, the side baffle is arranged on the outer side of the wide edge of the first ultraviolet lamp, and the shading side plate is arranged on the outer side of the wide edge of the second ultraviolet lamp.

In the spray head protection device, one end of the shading cover plate is connected with the sliding block, and the other end of the shading cover plate is arranged at the starting end of the curing device.

Among the above-mentioned shower nozzle protection device, the shading apron is a flexible light-tight banded coiled material, can follow the removal of sliding block and move along solidification equipment top, and when the sliding block pulled to the terminal point end from the initiating terminal, the shading apron sheltered from solidification equipment's lamp pearl completely, and when the sliding block pulled to the initiating terminal from the terminal point end, the shading apron was opened gradually, spills the solidification equipment of below gradually.

In the spray head protection device, the ultraviolet light safety detection sensor upwards transmits signals.

The utility model discloses use shower nozzle protection device, treat the in-process of printing the solidification of object to the top at solidification equipment, can avoid the ultraviolet ray direct irradiation that solidification equipment upwards jetted out to the shower nozzle, prevent to block up because of the shower nozzle orifice that the ultraviolet lamp shines and leads to, ensure shower nozzle safety work.

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 of the internal structure of the ink jet printer shown in FIG. 1 with the cover 7 hidden according to the present invention;

fig. 3 is a schematic perspective view of a core part according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of an ultraviolet light safety detection device in a curing device according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of the printing cart according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of the sensor cover plate 11 hidden in fig. 5 according to the present invention;

fig. 7 is a schematic perspective view of the sensor fixing block 20 hidden in fig. 6 according to the present invention;

fig. 8 is a bottom view of the print carriage in an embodiment of the present invention;

fig. 9 is a schematic view of an installation structure of a sprinkler head protection device according to another embodiment of the present invention;

FIG. 10 is a schematic diagram of the internal structure of the core portion of the inkjet protection device of FIG. 9 according to the present invention.

In the figure: printing trolley 1, printing cross beam 2, ink scraping maintenance device 3, object to be printed mounting mechanism 4, curing device 5, base part 6, outer cover 7, lifting device 8, object to be printed 0, spray head 10, sensor cover plate 11, ultraviolet sensor control plate 12, ultraviolet sensor 13, quartz glass 14, ultraviolet rays 15, emission signal 16, received signal 17, object to be printed initial position sensor 18, initial position sensor moving block 19, sensor fixing block 20, height measuring sensor emission end 21, sliding table 22, aluminum profile 23, insulating film 130, sliding block 50, first ultraviolet lamp 51, second ultraviolet lamp 52, ultraviolet lamp connecting plate 53, shading side plate 54, shading cover plate 55, first optical axis 56, second optical axis 57, ultraviolet light safety detection sensor 58, signal 580, side baffle 59, transparent object detection sensor receiving end 61, The sprayer protection mechanism 9, the sensor 91, the sensor reflection end 92, the screw motor 93, the first limit switch 94, the second limit switch 95, the slider 96, the guide rail 97, the sensor cover plate 98 and the emission hole 99.

Detailed Description

The following describes the protection device and protection method of the inkjet head for the inkjet printer in detail with reference to the drawings.

First, the present invention is described, as shown in fig. 1 and 2, the present invention provides an ink jet printer, which includes a printing cart 1, a printing beam 2, a wiping maintenance device 3, an object to be printed mounting mechanism 4, a curing device 5, a base part 6, an outer cover 7, and a control system (not shown). The printing device comprises a base part 6, a to-be-printed object mounting mechanism 4 is arranged above the middle of the base part 6, the to-be-printed object mounting mechanism 4 is used for fixedly mounting an to-be-printed object, a curing device 5 is arranged below the to-be-printed object mounting mechanism 4, the curing device 5 is used for irradiating and curing ink drops sprayed on the to-be-printed object, a printing cross beam 2 is arranged above the to-be-printed object mounting mechanism 4, a printing trolley 1 is mounted on the printing cross beam 2, the printing trolley 1 can move back and forth along the printing cross beam 2, namely the X-axis direction (first direction), a wiping maintenance device 3 is arranged below the initial position of the printing trolley, the wiping maintenance device 3 is used for wiping ink or moisturizing maintenance operation of a spray head on the printing trolley 1, and the ink or moisturizing maintenance operation is covered by an. 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: an operator firstly fixes and installs an object to be printed on the object to be printed installation mechanism 4, wherein the object to be printed can be a cylinder or a cone, and can also be an object with a printing area being 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 should meet the requirements of not only installing objects to be printed with different lengths and diameters, but also adjusting the parallelism of the upper surface of the object to be printed for printing the objects to be printed with different tapers; then, adjusting the distance between the upper surface of the object to be printed and the plane where the spray holes of the spray head are located to be the optimal printing distance, wherein the distance between the upper surface of the object to be printed and the plane where the spray holes of the spray head are located is usually adjusted to be 1-3 mm; then an operator presses a start button, the printing trolley 1 moves from an initial position along the X-axis direction, namely the first direction, towards the opposite side, the object to be printed rotates around the central axis of the printing trolley, when the printing trolley 1 passes over an image-text area needing to be printed on the object to be printed, ink drops are sprayed to the object to be printed to form images and texts, meanwhile, ultraviolet rays are upwards irradiated by a curing device 5 below the object to be printed, and curing treatment is carried out on the sprayed ink drops. After the printing trolley 1 passes the position above the object to be printed in one pass, the whole printing of the pictures and texts is finished; finally, the printing trolley returns to the initial position from the final position along the X-axis direction, namely the first direction. After waiting for the next object to be printed to be replaced, the operator presses the start button again, and the ink jet printer continues to repeat the above-described operation process to print the object to be printed.

The utility model discloses so just accomplish the printing of all pictures and texts after passing through once, except that the special algorithm control spiral of software sprays the ink droplet, also closely relevant with the arrangement of shower nozzle on the bottom plate, as shown in figure 8, this embodiment installs four shower nozzles 10, shower nozzle 10 concatenates at intervals along self length direction (X axle direction/first direction) in proper order, the line direction that four shower nozzles concatenated is parallel with the rotation center axis direction of waiting to print the object, every shower nozzle printable two kinds of colours, the first shower nozzle in the left side is used for spraying coating ink such as white (W) ink or preliminary treatment viscidity ink (P), also can not carry out the spraying of coating ink according to actual need, two shower nozzles in the middle are used for spraying magenta (M), yellow (Y), cyan (C) and black (K) ink, the shower nozzle in the right side is as reserve shower nozzle, can be used to eject transparent (V) ink, and can also be used to eject other colored or non-ejecting ink. The spray head arrangement mode is matched with motion control and software control, so that all pictures and texts can be sprayed and printed after the printing trolley passes through the area to be printed once along the X-axis direction in the process that the object to be printed rotates around the central axis of the printing trolley at a constant speed, and the printing efficiency is improved. An ink box for containing ink and a corresponding negative pressure control system can be arranged on the printing trolley 1. The utility model discloses an ink that the shower nozzle used is ultraviolet ray (UV) curable ink, carries out drying and solidification to it through setting up the ultraviolet curing lamp waiting to print the object below. The utility model discloses also can set up the shower nozzle of other quantity, confirm the order of arranging that sets up different colour inks according to the actual demand, this application does not specifically prescribe a limit to this.

Because solidification equipment 5 sets up in waiting to print the object below, and the printing shower nozzle is located and waits to print the object top and carry out the inkjet to it, carries out real-time solidification processing to the ink droplet in addition when the inkjet, consequently must ensure that solidification equipment 5 launches the ultraviolet ray light completely by sheltering from and can not shine to the shower nozzle orifice, otherwise can dry the orifice and make the orifice block up, and then damage the shower nozzle. The utility model discloses be used for avoiding shining dry shower nozzle at the device of two sets of protection shower nozzles of solidification equipment 5 department installation:

one set is an ultraviolet light safety detection device. As shown in fig. 3-4, the curing device 5 of the present invention comprises a first ultraviolet lamp 51 and a second ultraviolet lamp 52, wherein the first ultraviolet lamp 51 and the second ultraviolet lamp 52 are arranged side by side along the X-axis direction, i.e. the first direction, below the object to be printed 0, the first ultraviolet lamp 51 and the second ultraviolet lamp 52 are connected by an ultraviolet lamp connecting plate 53, a side baffle 59 is disposed outside the wide side of the first ultraviolet lamp 51, and a shading side plate 54 is disposed outside the wide 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 (the 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 other end of 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 shading cover plate 55 is a flexible and lighttight strip-shaped coiled material, and can move along the first optical axis 51, The second ultraviolet lamp 52 moves upwards, when the sliding block 50 is pulled to the end point end (one end of the side baffle plate 59 in the figure) from the starting end (one end of the shading side plate 54 in the figure), the shading cover plate 55 completely shades the lamp beads of the two ultraviolet lamps, when the sliding block 50 is pulled to the starting end (one end of the shading side plate 54 in the figure) from the end point end (one end of the side baffle plate 59 in the figure) in the figure, the shading cover plate 55 is gradually opened, the ultraviolet lamps below are gradually leaked, the sliding position of the sliding block 50/the shading cover plate 55 is adjusted according to the length of the image to be printed to be solidified before ink-jet printing, and the solidification range of the upward exposure of the solidification device is the. An ultraviolet light safety detection sensor 58 is installed above the sliding block 50, and the ultraviolet light safety detection sensor 58 of the present embodiment emits a signal 580 upward. When the ultraviolet safety detection device is applied to the printing process, and the ultraviolet safety detection sensor 58 detects that the signal 580 is blocked, the ultraviolet safety detection device indicates that the object 0 to be printed is positioned above an ultraviolet lamp irradiation area and effectively blocks ultraviolet light emitted by the ultraviolet lamp, and at the moment, a spray head of the printing trolley is in a safe state, and other operations can be performed; when the ultraviolet light safety detection sensor 58 detects that the signal 580 is not blocked, it indicates that the object 0 to be printed does not completely block the area irradiated by the ultraviolet light, at this time, the ultraviolet light is irradiated upwards, if the printing trolley passes through the area, the spray holes are directly irradiated, and the risk of being damaged by illumination exists, so that the spray head of the printing trolley is in an unsafe state, the control system controls the ultraviolet lamp to be turned off, printing is cancelled, the printing trolley returns to the printing starting position, and meanwhile, the printer screen gives an alarm to prompt that the position of the ultraviolet lamp shading cover plate is wrong, the ultraviolet lamp shading cover plate is corrected, and otherwise, the spray head is damaged by printing.

The other set is a transparent object detection device, if the object to be printed is transparent, the ultraviolet rays irradiated by the curing device 4 below can directly irradiate the spray orifice of the spray head to cause drying and blockage of the spray orifice, 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. Transparent object detection device includes transparent object detection sensor transmitting terminal and transparent object detection sensor receiving terminal 61 (as shown in fig. 2), transparent object detection sensor transmitting terminal sets up in the backup pad (not shown in the figure) of waiting to print object installation mechanism 4 below, be located the below of waiting to print the object, transparent object detection sensor transmitting terminal upwards sends the light beam, correspond transparent object detection sensor transmitting terminal, it is inboard at the top dustcoat of printer dustcoat 7, an installation transparent object detection sensor receiving terminal 61 is used for receiving the above-mentioned light beam of waiting to print object below sensor transmitting terminal transmission. If the object to be printed is a non-transparent object, or is a transparent object but is subjected to shielding treatment (for example, a non-transparent substance is stuffed into the transparent object), at this time, the light beam emitted by the emitting end of the transparent object detection sensor is shielded, the receiving end 61 of the transparent object detection sensor cannot receive a signal, which indicates that the light transmission state of the object to be printed is normal, feedback can be performed for other operations, and the control system controls the curing device to normally work and the printing operation to be normally performed; if the object to be printed is a transparent object, the light beam emitted by the transmitting 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, it is indicated that the object to be printed does not reach the printing position or the object to be printed is transparent and does not undergo light-tight treatment, the nozzle is in a dangerous state, if the printing is continued, ultraviolet light emitted by the curing device 5 can penetrate through the object to be printed and directly irradiate the nozzle hole of the nozzle, so that the nozzle hole is dry and damaged, at the moment, the control system controls the ultraviolet lamp to be closed, the printing is cancelled, the printing trolley returns to the initial printing position, and meanwhile, the printer screen gives an alarm to prompt that the.

In addition to the two sets of devices for protecting the nozzles installed on the curing device 5, an ultraviolet radiation protection device is also installed on the printing cart 1, and the ultraviolet radiation protection device installed on the printing cart 1 is described below. As shown in fig. 5, the ultraviolet irradiation preventing device is disposed on the left side of the printing cart and covered by the cover 7, which is convenient for beauty. As shown in fig. 6 to 8, the ultraviolet irradiation preventing device includes an ultraviolet sensor control board 12 and an ultraviolet sensor 13, the ultraviolet sensor 13 is mounted on the sidewall of the printing cart 1 through a sensor fixing block 20, and the sensor fixing block 20 can be adjusted 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 (the first direction) coincides with the center line of the head in the X-axis direction (the first direction). An ultraviolet sensor control board 12 is further installed on the side wall of the printing cart 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 other visible light and simultaneously 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 for preventing conduction with a screw for fixing the ultraviolet sensor 13.

The ultraviolet sensor 13 converts the ultraviolet signal into an electric signal by using a photosensitive element, the sensing window at the lower end of the ultraviolet sensor receives the irradiation of the ultraviolet lamp in the curing device below, once the ultraviolet ray 15 emitted by the ultraviolet lamp leaks upwards and reaches a triggering threshold set by the ultraviolet sensor 13 (the threshold can be changed according to actual conditions and test results), the ultraviolet ray 15 is fed back to the ultraviolet sensor control board 12 by the ultraviolet sensor 13, the control system controls the ultraviolet lamp to be closed at the moment, printing is cancelled, the printing trolley returns to the initial printing position, and meanwhile, the printer screen gives an alarm and prompts that the ultraviolet ray leakage is detected and the printer is required to be corrected, otherwise, the printer damages the spray head.

When the ultraviolet sensor 13 is installed on the side wall of the printing trolley 1, the sensor fixing block 20 is adjusted 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 (the first direction) coincides with the center line of the nozzle in the X-axis direction (the first direction). The specific working process is as follows: after a printer starting button is pressed, the printer starts to work, the ultraviolet sensor 13 is powered on, the ultraviolet light intensity below the printer starts to be detected, and the detection process comprises a stage that the printing trolley before printing is close to a curing device below, a stage that the printing trolley in the printing process and a stage that the printing trolley after printing is far away from the curing device. The ultraviolet sensor judges the detection result and feeds the detection result back to the sensor control panel: if the intensity of the ultraviolet rays received by the sensing window of the ultraviolet ray sensor reaches a preset threshold value, the ultraviolet lamp is turned off, printing is cancelled, and the printing trolley returns to the printing initial position; and if the ultraviolet intensity received by the sensing window of the ultraviolet sensor does not reach the preset threshold value, the ink-jet printer works normally. By sensing the intensity of the ultraviolet rays, the damage of the spray head caused by the fact that the light rays leaked upwards from the curing device irradiate the spray hole of the spray head can be prevented.

It should be noted that except the situation that the ultraviolet radiation prevention device is arranged on one side of the printing trolley in the embodiment of the attached drawings, the ultraviolet radiation prevention device can be respectively arranged on two sides of the printing trolley in a group, or arranged on the other side of the printing trolley, and the ultraviolet radiation prevention device is determined according to the printing mode, has the same working principle and does not depart from the protection scope of the utility model.

In addition, an initial position detection device for the object to be printed is further arranged on the left side wall of the printing trolley 1, and as shown in fig. 5, the initial position detection device for the object to be printed is covered by the outer cover 7, so that the appearance is attractive. As shown in fig. 6-8, the device for detecting the initial position of the object to be printed includes an initial position sensor 18 of the object to be printed and an initial position sensor moving block 19, the initial position sensor 18 of the object to be printed is installed below the initial position sensor moving block 19 by screws, the initial position sensor moving block 19 is installed on a sensor fixing block 20, a long hole with an adjustable position is formed in 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 spray head 10, the initial position sensor 18 of the object to be printed sends a transmission signal 16 during operation, when the printing trolley 1 moves along the X-axis direction (first direction), after LXH1, the transmission signal 16 can be reflected by the bottom, the initial position sensor 18 of the object to be printed receives the returned receiving signal 17, detects the initial end of the object to be printed, and then calculates when the nozzle should jet ink drops to form images and texts according to the distance between the image area to be printed and the initial end of the object to be printed, so that the arrangement of scales and the like can be omitted, the ink jet position can be accurately judged, and the preset images and texts can be printed.

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 object to be printed and the plane where the spray orifices of the spray head are located to be the optimal printing distance of 1-3mm, the lifting height of the installation mechanism 4 of the object to be printed is usually adjusted, so that the optimal printing distance is ensured. Because the height of the object to be printed needs to be changed in a lifting way, at the moment, a set of nozzle protection device for ensuring that the nozzle is prevented from being collided by the object to be printed is needed, which is called as the nozzle collision-free protection device, as shown in fig. 2, the nozzle collision-free protection device comprises a height measurement sensor transmitting end 21, a sliding table 22, an aluminum profile 23 and a height measurement sensor receiving end (not shown in the figure), the aluminum profile 23 is arranged on the printing cross beam 2 through an angle joint block and is perpendicular to the printing cross beam 2 along the Y-axis direction, namely the second direction, the sliding table 22 is arranged on the aluminum profile 23, the sliding table 22 can adjust along the Y-axis direction, namely the second direction, the height measurement sensor transmitting end 21 is arranged on the sliding table 22, the height measurement sensor transmitting end 21 can perform lifting movement along the Z-axis direction with the sliding table 22, and a height measurement sensor receiving end is arranged on the inner side of the, for receiving the light beam emitted by the altimeter sensor emitting end 21. When the collision-proof protection device of the spray head is installed, the height of the light beam emitted by the height measuring sensor is adjusted to be positioned slightly below the plane of the spray hole of the spray head. Then the height of the object fixing device 4 to be printed 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 fixing device 4 controls the object to be printed to ascend and shield the light beam emitted by the emission end 21 of the height measuring sensor, then the lifting device controls the object to be printed to descend to a triggering 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 away from the plane where the spray holes of the spray head are located. After the next object to be printed is replaced or in the printing process, when the object to be printed shields the ray between the height measuring sensors, the fact that the height of the upper surface of the object to be printed threatens the spray head is indicated, at the moment, the printing trolley is stopped to move, the screen gives an alarm 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 shield 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 head are located, the spray head is safe relative to the object to be printed, and the printing trolley can continue to move above the object to be printed without colliding with the spray head.

In addition to the above-mentioned embodiment, the distance between the upper surface of the object to be printed and the plane where the nozzle holes of the nozzle are located can be adjusted to the optimal printing distance by adjusting the lifting of the printing trolley 1 in addition to the lifting of the object to be printed mounting mechanism 4. As shown in fig. 9 to 10, when the height of the object to be printed is not adjustable, and the printing cart 1 is designed to be adjustable, since the diameter of each batch of the object to be printed may change, when the object to be printed 0 of a certain size is initially installed or replaced, a set of nozzle protection mechanism 9 that can be lifted along with the printing cart 1 is required to ensure that the bottom surface of the nozzle is not scratched by the object to be printed 0. The nozzle protection mechanism 9 includes sensor 91, sensor reflection end 92, lead screw motor 93, first limit switch 94, second limit switch 95, slider 96, guide rail 97 and sensor cover plate 98, and sensor 91 explains as an example with a laser ranging sensor in this embodiment, also can be other sensors, the utility model discloses do not restrict to this. Sensor 91 installs on the lead screw of lead screw motor 93 through the support (not shown in the figure), lead screw motor 93 can drive sensor 91 and carry out elevating movement along vertical direction Z axle direction promptly, the lower extreme of lifting range sets up first limit switch 94 and carries out spacingly, the highest extreme of lifting range sets up second limit switch 95 and carries out spacingly, a slider 96 is still connected to the support of connecting sensor 91, slider 96 moves along guide rail 97, guide rail 97 sets up along vertical direction Z axle direction promptly, play the guide effect, set up a transmission hole 99 on sensor cover plate 98, transmission hole 99 is the slot hole of a vertical setting, the light beam 90 accessible transmission hole 99 of sensor 91 transmission end shines contralateral sensor reflection end 92. If the object to be printed is higher than the light beam 90, namely the object to be printed is blocked between the sensor 91 and the sensor reflection end 92, the sensor 91 is triggered; if there is no object to be printed between the sensor 91 and the sensor reflection end 92, the sensor 91 is not triggered. There is also an advantage to using a laser range sensor here: according to the principle of the laser ranging sensor and the setting of software, the information misinformation caused by shielding the light beam 90 during the ink scraping maintenance operation of 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, the alarm caused by shielding the light beam 90 can be avoided.

It should be noted that the sensor 91 may also be a common laser sensor, and the sensor reflection end 92 is set as a receiving light beam end at this time, and it may be a receiving board covering the light beam lifting range of the sensor transmission end 91 at this time, and may also be set as a receiving device following the lifting of the sensor transmission end 91 to perform synchronous lifting, which is not limited to this.

The function of the head protection mechanism 9 includes two aspects: on one hand, after a batch of objects to be printed are installed and before printing operation, the distance of the printing trolley descending to the printing position is measured and calculated; on the other hand, during the printing work, the upper surface of the object to be printed is prevented from exceeding the safe height to collide with the spray head.

The detection working process of the nozzle protection mechanism 9 after the installation of the object to be printed and before the printing operation is as follows: firstly, the printing trolley 1 and the sensor 91 both rise to the highest initial position along the vertical direction, and then the sensor 91 detects the distance difference in the vertical direction between the height of the plane where the spray hole is located when the printing trolley 1 is at the highest position and the height of the light beam emitted when the sensor 91 is at the highest position, which is marked as h; secondly, the control system controls the sensor 91 to move downwards along the vertical direction, when the emitted light beam 90 is shielded by an object to be printed, the control system controls the sensor 91 to stop moving, 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 of the sensor 91 to the detection position is recorded as H; thirdly, according to the distances H and H detected by the sensor 91 and the optimal printing distance between the plane where the spray holes of the spray head are located and the upper surface of the object to be printed, software calculates the height of the printing trolley 1 which should be lowered, and the control system controls the printing trolley 1 to be lowered from the highest position along the vertical direction by the height. 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 (i.e. the upper 2mm area) at the upper part of the light spot is higher than the plane of the nozzle hole of the nozzle, the 1/3 area (i.e. the lower 2mm area) at the lower part of the light spot is lower than the upper surface of the object to be printed, and the 1/3 area (i.e. the middle 2mm area) in the middle of the light spot is a valid detection light beam.

In the printing process, the protection operation principle 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 may be collided by the object to be printed, at the moment, the control system controls the printing trolley 1 to suddenly stop, and the screen gives an alarm and prompts that the medium is too high; if the effective detection beam of the sensor 91 is not triggered, it indicates that the height of the object to be printed is safe relative to the nozzle, and the printing carriage 1 continues to operate normally.

When objects to be printed with different diameters are replaced, the sensor 91 in the printing trolley 1 and the nozzle protection mechanism 9 needs to be lifted to the highest initial position, the nozzle protection mechanism 9 needs to repeat the detection working process again, the software calculates the distance that the printing trolley should descend, the control system controls the printing trolley to descend to the proper printing position, and then the nozzle protection mechanism 9 performs protection operation in the printing process.

It is to be understood that various modifications may be made in the details of the embodiments of the invention without departing from the spirit of the invention and the scope of the claims.

Claims

1. The utility model provides a shower nozzle protection device for ink jet printer, the setting is in solidification equipment top, a serial communication port, shower nozzle protection device includes the sliding block, the shading apron, first optical axis, second optical axis and ultraviolet ray safety inspection sensor, set up first optical axis and second optical axis along the first direction in solidification equipment top, first optical axis and second optical axis cover solidification equipment's length direction and carry out the end fixing, pass a sliding block on first optical axis and second optical axis, the sliding block can be followed first optical axis and second optical axis and slided, install a shading apron on the sliding block, the shading apron can carry out the sheltering from of different distances to solidification equipment along with the sliding block removal, an ultraviolet ray safety inspection sensor is installed to the top of sliding block, thereby it shelters from and ensures that the shower nozzle avoids being shone to be used for detecting the top to have the object of waiting to print.

2. The nozzle tip protection device of claim 1, wherein the curing device comprises an ultraviolet lamp, and the curing device cures the object to be printed thereon.

3. The nozzle protection device of claim 2, wherein a printing cross beam is arranged above the object to be printed, and the printing trolley on the printing cross beam performs image-text spray painting on the object to be printed when passing above the object to be printed.

4. The showerhead protection device of claim 2, wherein the ultraviolet lamps comprise a first ultraviolet lamp and a second ultraviolet lamp, the first ultraviolet lamp and the second ultraviolet lamp connected by an ultraviolet lamp connection plate.

5. The showerhead protection device of claim 4, wherein a side baffle is positioned outside the broad edge of the first UV lamp and a shadow side plate is positioned outside the broad edge of the second UV lamp.

6. The head protection device of claim 1, wherein one end of the light shielding cover plate is connected to the sliding block, and the other end is disposed at the starting end of the curing device.

7. The spray head protection device of claim 1, wherein the light shield is a flexible opaque strip of material that moves along the upper side of the curing device with the movement of the slider, wherein the light shield completely shields the beads of the curing device when the slider is pulled from the starting end to the ending end, and wherein the light shield gradually opens to gradually leak out of the underlying curing device when the slider is pulled from the ending end to the starting end.

8. The spray head protection device of claim 1, wherein the ultraviolet light safety detection sensor emits a signal upward.