阅读说明：本技术 喷墨打印机用喷头保护装置及喷头保护方法 (Nozzle protection device and nozzle protection method for ink-jet printer ) 是由 张原� 张征宇 于 2019-11-01 设计创作，主要内容包括：本发明提供一种喷墨打印机用喷头保护装置及喷头保护方法,用来检测下方固化装置向上照射至打印小车上的紫外光强度,其特征在于,喷头保护装置包括紫外线传感器控制板和紫外线传感器,紫外线传感器通过传感器固定块安装在打印小车的侧壁上,在紫外线传感器上方、打印小车的侧壁上安装一紫外线传感器控制板,紫外线传感器控制板用来控制紫外线传感器的工作,当检测的紫外线强度达到设定的触发阈值时,控制系统控制紫外灯关闭,并取消打印,从而保护喷头免被紫外灯照射喷孔。本发明通过喷头保护装置,能够确保喷头喷孔的安全,可防止固化装置在固化其上待打印物体时固化到喷头喷孔进而造成喷头损坏。(The invention provides spray head protection devices and spray head protection methods for inkjet printers, which are used for detecting the intensity of ultraviolet light irradiated upwards from a curing device below onto a printing trolley, and are characterized in that the spray head protection devices comprise ultraviolet sensor control panels and ultraviolet sensors, the ultraviolet sensors are installed on the side wall of the printing trolley through sensor fixing blocks, ultraviolet sensor control panels are installed above the ultraviolet sensors and on the side wall of the printing trolley, the ultraviolet sensor control panels are used for controlling the work of the ultraviolet sensors, and when the detected ultraviolet intensity reaches a set trigger threshold, a control system controls the ultraviolet lamps to be turned off and cancels printing, so as to protect spray heads from being irradiated by the ultraviolet lamps.)

The utility model provides a shower nozzle protection device for kinds of inkjet printer, be used for detecting the below solidification equipment and upwards shine the ultraviolet intensity of shower nozzle on printing the dolly, a serial communication port, shower nozzle protection device includes ultraviolet sensor control panel and ultraviolet sensor, ultraviolet sensor passes through the sensor fixed block and installs on the lateral wall of printing the dolly, in ultraviolet sensor top, the lateral wall installation ultraviolet sensor control panel of printing the dolly, the ultraviolet sensor control panel is used for controlling ultraviolet sensor's work, when the ultraviolet intensity who detects reaches the trigger threshold value of settlement, control system control ultraviolet lamp is closed, and cancel printing, thereby the protection shower nozzle avoids being shone the orifice by the ultraviolet lamp.

2. The showerhead protection device of claim 1, wherein quartz glass is disposed below the ultraviolet sensor, the quartz glass being configured to filter out other visible light while attenuating the intensity of the ultraviolet light to prevent illumination of the sensing window.

3. The spray head protection device of claim 1, wherein light source is further disposed below the ultraviolet sensor for self-checking of the spray head protection device.

4. The head protection device as claimed in claim 1, wherein the uv sensor control board and the uv sensor are provided on any sides of the printing carriage, or the uv sensor control board and the uv sensor are provided on each of the left and right side walls of the printing carriage in groups, respectively.

5. The spray head protection device of claim 1, wherein the sensor fixing block is adjustable back and forth in the Y-axis direction, i.e., the second direction, such that a center line of a sensing window of the ultraviolet sensor in the X-axis direction, i.e., th direction, coincides with a center line of the spray head in the X-axis direction, i.e., th direction.

6. The spray head protection device of claim 1, wherein the ultraviolet sensor is mounted with a sensor fixing block by screws, and the ultraviolet sensor control board is fixed with the side wall of the trolley by screws.

7. The head protection device as claimed in claim 1, wherein insulating film is provided above said ultraviolet sensor, the insulating film being used to prevent conduction with a screw for fixing the ultraviolet sensor.

8, A head protection method for the head protection device of claim 1, comprising the steps of:

a) installing a spray head protection device on the side wall of the printing trolley and adjusting the position of a sensing window on the ultraviolet sensor;

b) pressing a printer starting button, and feeding back whether the ultraviolet sensor is in a normal working state or not by self-checking;

c) after the self-checking is normal, the ultraviolet sensor starts to detect the intensity of the ultraviolet light below the ultraviolet sensor;

d) the ultraviolet sensor judges and feeds back the detection result to the sensor control panel: if the intensity of the ultraviolet rays received by the induction window of the ultraviolet ray sensor reaches a preset threshold value, the ultraviolet lamp is turned off, and printing is cancelled; 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.

9. The nozzle protection method of the nozzle protection device according to claim 8, wherein the adjusting of the position of the sensing window of the ultraviolet sensor in the step a) is specifically to adjust the sensor fixing block along the Y-axis direction, i.e. the second direction, so that the center line of the sensing window of the ultraviolet sensor in the X-axis direction, i.e. , coincides with the center line of the nozzle in the X-axis direction, i.e. .

10, A nozzle protection method for nozzle protection device according to claim 8, wherein the process of detecting the intensity of the ultraviolet light below in step c) includes the stage of the print carriage before printing approaching the curing device below, the stage of the print carriage during printing and the stage of the print carriage after printing departing from the curing device, and the preset threshold value in step d) can be changed according to the actual situation.

Technical Field

The invention relates to a spray head protection device and a spray head protection method for ink-jet printers, in particular to a spray head protection device and a spray head protection method for ink-jet printers with printing cylinders, cones or printing areas being cylindrical/conical objects.

Background

The ink-jet printing is divided into Scanning ink-jet printing and -time paper-feeding imaging (Onepass) ink-jet printing according to the moving modes of a printing trolley and an object to be printed, wherein the printing trolley moves back and forth along a 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 moving direction of the printing trolley, the guide rail beam on which the printing trolley is mounted is stationary, and platform ink-jet printing has two conditions in the ink-jet printing application, namely that the guide rail beam is stationary in the ink-jet printing process, the printing trolley moves back and forth along the guide rail beam, the printing platform moves relatively along the direction perpendicular to the moving direction of the printing trolley, that the printing platform is stationary, the nozzle moves relatively along the direction perpendicular to the moving direction of the printing trolley, and that the width of the printing trolley is relatively wide when the ink-jet printing trolley moves back and forth, and the width of the printing trolley is relatively wide when the ink-jet printing trolley moves back and the nozzle moves back and the printing trolley is used for printing.

The method is generally used for printing plane objects, more and more curved objects need digital printing with the increase 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 method, ink jet printing devices special for curved printing are needed, the invention patent 201811577354.7 discloses a curved 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, the curing device irradiates the ink droplets on the objects to be printed above while the nozzle sprays ink, however, ultraviolet rays of the ultraviolet lamps cannot irradiate the nozzle, irradiate the nozzle orifices of the nozzle, the ink at the nozzle orifices can dry and block the nozzle orifices, further damage the nozzle, the printing device cannot normally work, serious consequences are caused, and the printing device can be applied to the nozzles to be replaced, and the objects to be used for preventing the objects to be printed after primary printing on the surfaces of the objects to be printed and the objects to be printed are high-required to be printed, the objects to be printed, the objects to prevent the problems of the objects to be printed, such as 4625.

Disclosure of Invention

In view of the problems of the prior art, the present invention aims to provide head protection devices and head protection methods for inkjet printers, which can prevent the nozzle holes of the heads from being irradiated by ultraviolet light emitted by a curing device.

In order to achieve the purpose, the invention provides spray head protection devices for an ink-jet printer, which are used for detecting the intensity of ultraviolet light irradiated upwards from a curing device below to a printing trolley, and are characterized in that the spray head protection devices comprise ultraviolet sensor control panels and ultraviolet sensors, the ultraviolet sensors are installed on the side wall of the printing trolley through sensor fixing blocks, ultraviolet sensor control panels are installed above the ultraviolet sensors and on the side wall of the printing trolley, the ultraviolet sensor control panels are used for controlling the work of the ultraviolet sensors, and 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 cancelled, so that spray orifices are protected from being irradiated by the ultraviolet lamps.

In the sprayer protection device, quartz glass is arranged below the ultraviolet sensor and used for filtering out other visible light and simultaneously weakening the intensity of ultraviolet light to prevent the induction window from being damaged.

In the spray head protection device, light source is arranged below the ultraviolet sensor for self-checking of the spray head protection device.

In the spray head protection device, the ultraviolet sensor control board and the ultraviolet sensor are arranged at any side of the printing trolley, or the ultraviolet sensor control board and the ultraviolet sensor are respectively provided with groups on the left side wall and the right side wall of the printing trolley.

In the spray head protection device, the sensor fixing 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 th direction is overlapped with the central line of the spray head in the X-axis direction, namely the th direction.

In the spray head protection device, the ultraviolet sensor is installed with the sensor fixing block through the screw, and the ultraviolet sensor control plate is fixed with the side wall of the trolley through the screw.

In the head protection device, insulating film is arranged above the ultraviolet sensor, and the insulating film is used for preventing the ultraviolet sensor from being conductive with the screw for fixing the ultraviolet sensor.

The invention provides spray head protection methods of the spray head protection device, which is characterized by comprising the following steps:

a) installing a spray head protection device on the side wall of the printing trolley and adjusting the position of a sensing window on the ultraviolet sensor;

b) pressing a printer starting button, and feeding back whether the ultraviolet sensor is in a normal working state or not by self-checking;

c) after the self-checking is normal, the ultraviolet sensor starts to detect the intensity of the ultraviolet light below the ultraviolet sensor;

d) the ultraviolet sensor judges and feeds back the detection result to the sensor control panel: if the intensity of the ultraviolet rays received by the induction window of the ultraviolet ray sensor reaches a preset threshold value, the ultraviolet lamp is turned off, and printing is cancelled; 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.

In the method for protecting the nozzle, the step a) of adjusting the position of the sensing window of the ultraviolet sensor is to adjust the sensor fixing block 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 th direction, is overlapped with the central line of the nozzle in the X-axis direction, namely the th direction.

In the method for protecting the spray head, the process of detecting the intensity of the ultraviolet light below in the step c) comprises a stage of the printing trolley before printing approaching to a curing device below, a stage of the printing trolley during printing and a stage of the printing trolley after printing departing from the curing device.

In the method for protecting the nozzle, the preset threshold value in the step d) can be changed according to the actual situation.

The invention uses the spray head protection device, and can prevent ultraviolet rays emitted or reflected upwards by the curing device from irradiating spray orifices of the spray head after the ultraviolet rays are accumulated to constant intensity in the process of curing an object to be printed above by the curing device, thereby preventing the spray orifices of the spray head from being blocked due to the accumulation of ultraviolet rays and ensuring the safe operation of the spray head.

Drawings

FIG. 1 is a schematic perspective view of an ink jet printer according to embodiments 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;

FIG. 3 is a perspective view of the core of embodiments of the present invention;

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

FIG. 5 is a schematic perspective view of an example print carriage according to the present invention;

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

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

FIG. 8 is a bottom view of an example print cart according to the present invention;

FIG. 9 is a schematic view of the mounting structure of another embodiments of the sprinkler head protection device according to the present invention;

FIG. 10 is a schematic diagram of the internal structure of the core portion of the ink-jet protection device shown in FIG. 9 according to the present invention.

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

Detailed Description

The following describes the protection apparatus and protection method of the head for an inkjet printer according to the present invention in detail with reference to the accompanying drawings.

Firstly, the ink-jet printer is introduced, as shown in fig. 1 and 2, the ink-jet printer comprises a printing trolley 1, a printing cross beam 2, an ink scraping 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 in the figures), wherein the object to be printed mounting mechanism 4 is arranged above the middle part of the base part 6, the object to be printed mounting mechanism 4 is used for fixedly mounting an object to be printed, an curing device 5 is arranged below the object to be printed mounting mechanism 4, the curing device 5 is used for carrying out irradiation curing treatment on ink droplets sprayed on the object to be printed, a printing cross beam 2 is arranged above the object to be printed mounting mechanism 4, a printing trolley 1 is arranged on the printing cross beam 2, the printing trolley 1 can reciprocate along the direction of the X axis (direction of the X axis), the ink scraping maintenance device 3 is arranged below the initial position of the printing trolley 1, the printing trolley is used for carrying out ink scraping operation or maintenance operation on a nozzle head on the printing trolley 1, the printing trolley can be conveniently adjusted along the direction of the printing cone of the printing trolley, the printing trolley 1, the printing trolley can be printed object to be printed, the printing trolley can be conveniently, the printing trolley can be adjusted by the printing trolley, the printing trolley can be adjusted by the printing trolley, the printing trolley 1, the printing trolley can be adjusted by the printing trolley, the.

In the invention, printing of all images and texts is completed after passes, except that special algorithms of software control spiral ink drop spraying, the arrangement mode of the nozzles on a bottom plate is closely related, as shown in fig. 8, four nozzles 10 are installed in the embodiment, the nozzles 10 are sequentially connected in series at intervals along the length direction (X axis direction/ th direction) of the nozzles, namely the connecting line direction of the four nozzles connected in series is parallel to the rotation central axis direction of an object to be printed, each nozzle can print two colors, the th nozzle on the left side is used for spraying coating ink such as white (W) ink or pretreated viscous ink (P), and the coating ink can be not sprayed according to actual needs, the middle two nozzles are used for spraying magenta (M), yellow (Y), cyan (C) and black (K) ink, the right nozzle is used as a spare nozzle, can be used for spraying transparent (V) ink, and can also be used for spraying other color ink or not spraying ink.

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 invention installs two sets of devices for protecting the spray head at the curing device 5 to avoid drying the spray head:

when the ink jet printer is in the printing process, the curing device 5 of the present invention includes the first uv lamp 51 and the second uv lamp 52, the first 0 uv lamp 51 and the second uv lamp 52 are arranged side by side under the object to be printed 0 in the X-axis direction, i.e., the -th direction, as shown in fig. 3-4, the third uv lamp 51 and the second uv lamp 52 are connected by the uv lamp connecting plate 53, the side shutter 59 is disposed outside the wide side of the uv lamp 51, the shading side plate 54 is disposed outside the wide side of the second uv lamp 52, the uv light safety detection device is disposed on the curing device 5, the uv light safety detection device includes the slider 50, the shading cover 55, the optical axis 56 of the first uv lamp 24 5, the second optical axis 57 and the uv light safety detection sensor 58, the optical axis 56 and the second optical axis 57 are disposed above the uv lamp 51 and the second uv lamp 52 in the long-side direction (direction, i.e., direction of the -7-when the slider 5 slider is moved to the printing head 54, the slider 54 is moved to the printing head 54, the printing head 54 is moved to the printing head 54, the printing head is moved to the printing head 54, the printing head is moved to the printing head 54, the printing head is moved to the printing head 54, the printing head is moved to the printing head 54, the printing head is moved to the printing head 54, the printing head is moved to the printing head 54, the printing head 54.

The transparent object detection device comprises a transparent object detection sensor transmitting end and a transparent object detection sensor receiving end 61 (shown in figure 2), the transparent object detection sensor transmitting end is arranged on a support plate (not shown) below the to-be-printed object mounting mechanism 4 and is positioned below the to-be-printed object, the transparent object detection sensor transmitting end emits light beams upwards, the transparent object detection sensor transmitting end corresponds to the transparent object detection sensor transmitting end and is arranged on the inner side of the top end outer cover of the printer outer cover 7, the transparent object detection sensor receiving end 61 is arranged for receiving light beams emitted by the sensor transmitting end below the to-be-printed object, if the to-be-printed object is a non-transparent object, or if the to-be-printed object is a transparent object but is subjected to shielding treatment (for example, a non-transparent substance is plugged into the transparent object), the printing system can print the to-print the printing operation of the to-be-carried out, and the printer can not print the ink jet orifice, and the printer can print the ink jet orifice, the ink jet orifice can be printed, and the ink jet can be printed, the ink jet orifice can be printed, the printer can be used for printing operation of the ink jet orifice can be printed, the printer can be used for printing operation of a printing system can be controlled, the printer can be used for printing operation of a printer, the printer can be controlled, the printer can be used for printing system, the printer can be used for printing operation of a printer, the printer can be.

In addition to the two sets of devices for protecting the nozzles installed on the curing device 5, the printing trolley 1 is further provided with an ultraviolet radiation prevention device, and the ultraviolet radiation prevention device installed on the printing trolley 1 is described below, as shown in fig. 5, the ultraviolet radiation prevention device is installed on the left side of the printing trolley and is covered by the outer cover 7, so that the appearance is attractive, as shown in fig. 6-8, the ultraviolet radiation prevention device comprises an ultraviolet sensor control board 12 and an ultraviolet sensor 13, the ultraviolet sensor 13 is installed on the side wall of the printing trolley 1 through a sensor fixing block 20, 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 ( direction) coincides with the center line of the nozzle in the X-axis direction ( direction), the ultraviolet sensor control board 12 is further installed on the side wall of the printing trolley 1 above the ultraviolet sensor 13, the ultraviolet sensor control board 12 is used for controlling the operation of the ultraviolet sensor 13, quartz glass 14 is arranged below the ultraviolet sensor 13, the quartz glass is used for filtering out other visible light, and can be used for preventing the ultraviolet radiation of the conductive screw 130 when the ultraviolet sensor 130, and the ultraviolet sensor 13 is arranged.

The ultraviolet sensor 13 converts the ultraviolet signal into an electric signal by using a photosensitive element, a 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 sensor 13 feeds back the ultraviolet ray to the ultraviolet sensor control panel 12, the control system controls the ultraviolet lamp to be closed at the moment, printing is cancelled, the printing trolley returns to the printing initial position, and meanwhile, the printer screen gives an alarm and prompts that the ultraviolet ray leakage is detected and the printer is required to correct, otherwise, the printing damages the spray head.

In order to ensure the normal operation of the ultraviolet radiation prevention device, self-checking procedures are set after the device is started, specifically, a light source which irradiates upwards is arranged at the lower end of a sensing window of the ultraviolet sensor 13, after the device is started, light beams emitted by the light source irradiate to the sensing window of the ultraviolet sensor 13 through quartz glass 14, the light beams can be received and fed back by the ultraviolet sensor 13, and the irradiation intensity can not be damaged to a nozzle, if the ultraviolet radiation prevention device works is normal, light source signals are received and fed back to the ultraviolet radiation prevention device to be in a normal working state after self-checking, the printer can continue to work normally, if the ultraviolet radiation prevention device cannot receive light source signals for feedback, the ultraviolet sensor 13 or the ultraviolet sensor control panel 12 can be damaged, the quartz glass 14 can be blurred, the receiving of the sensing window can be influenced, and at this time, the device is started again to work after the fault of the ultraviolet.

When the ultraviolet sensor 13 is installed on the side wall of the printing trolley 1, then the sensor fixing block 20 is adjusted along the Y-axis direction (direction ) so that the center line of the sensing window of the ultraviolet sensor 13 in the X-axis direction (direction ) coincides with the center line of the spray head in the X-axis direction (direction ).

It should be noted that, in addition to the case that the ultraviolet radiation protection device is disposed on the side of the printing cart in the embodiment of the drawings, the ultraviolet radiation protection device may be disposed on each of the two sides of the printing cart in groups, or disposed on the other side of the printing cart, and the operation principle is the same according to the printing mode, without departing from the protection scope of the present invention.

As shown in fig. 6-8, the initial position detection device for the object to be printed comprises an initial position sensor 18 for the object to be printed and a moving block 19 for the initial position sensor, the initial position sensor 18 for the object to be printed is mounted below the moving block 19 for the initial position sensor by screws, the moving block 19 for the initial position sensor is mounted on the fixed block 20 for the sensor, the moving block 19 for the initial position sensor is provided with a long hole with an adjustable position, the moving block 19 for the initial position sensor can drive the initial position sensor 18 for 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 for the object to be printed to correspond to the width direction of the nozzle 10, the initial position sensor 18 for the object to be printed sends a transmission signal 16 during operation, when the printing trolley 1 moves along the X-axis direction (direction ), when the bottom of the object to be printed is met, the transmission signal 16 is reflected by the bottom of the object to be printed, the initial position sensor 18 for the object to be printed receives an image and receives an initial position signal, so as to accurately determine when the ink droplet printing distance is detected, and the ink jet distance of the ink jet head is accurately calculated, and the ink jet area is accurately calculated.

When an operator needs to adjust the distance between the upper surface of the object to be printed and the plane where the nozzle hole of the nozzle is located to be the optimal printing distance of 1-3mm after the object to be printed with the same size is installed for the first time, the lifting height of the installation mechanism 4 of the object to be printed is generally adjusted so as to ensure the optimal printing distance, since the height of the object to be printed needs to be changed in a lifting manner, a set of nozzle protection device which ensures that the nozzle is not collided by the object to be printed is also needed at this time, which is referred to as a nozzle collision-free protection device, as shown in fig. 2, the nozzle collision-free protection device comprises a height measurement sensor emission end 21, a sliding table 22, an aluminum profile 23 and a height measurement sensor receiving end (not shown in the drawing), the aluminum profile 23 is installed on the printing cross beam 2 through an angle joint block and is set in the Y-axis direction, i.e., the second direction, the sliding table 22 is installed on the aluminum profile 23, the sliding table 22 can adjust the Y-axis direction, i.e., the second direction, the Y-axis direction, the height of the sliding table 22 is adjusted, the emission end 21 of the sliding table 22, the emission end of the emission sensor is installed, the emission end 21 of the height measurement sensor, the emission end 21 of the emission of the printing head is adjusted so as to be adjusted, the emission of the printing medium, the printing cross-axis direction, the emission of the printing head is adjusted, the emission of the printing medium to be-axis is adjusted, the printing cross-axis direction, the emission end of the printing cross-axis direction, the emission of the printing trolley 22, the printing trolley is adjusted, the printing trolley 22, the emission trolley is adjusted, the emission of the printing trolley is adjusted, the emission trolley 21, the emission of the emission trolley is adjusted, the emission trolley is adjusted to be-axis of the emission trolley 22, the printing trolley is adjusted, the emission trolley, the printing trolley is adjusted, the printing trolley, the emission trolley is adjusted to be adjusted, the emission trolley, the printing trolley, the emission trolley is adjusted.

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 hole of the head is located can be adjusted to the optimal printing distance by adjusting the lifting of the printing trolley 1, as shown in fig. 9-10, when the object to be printed is not lifted adjustably and the printing trolley 1 is designed to be lifted adjustably, since the diameter of each batch of the object to be printed may vary when the object to be printed 0 of a certain size is initially installed or replaced, sets of the head protection mechanism 9 that can be lifted and lowered with the printing trolley 1 are required to ensure that the bottom surface of the head is not scratched by the object to be printed 0, the head protection mechanism 9 includes the sensor 91, the sensor reflection end 92, the lead screw motor 93, the limit switch 94, the second limit switch 95, the slider 96, the guide rail 97 and the sensor cover plate 98, in this embodiment, the sensor 91 is described by taking the laser ranging sensor as an example, or may be other sensors, if the sensor 91 is installed on the support (not shown in the support) (not shown in the drawings), the support) and the guide rail 91 is installed on the support (not installed on the support) and the support (shown in the support), the support) and the vertical guide rail 90, the lift sensor 90 is installed, the lift sensor 90, if the lift sensor 90, the lift sensor 90 is installed in the lift end of the lift guide rail 91, the lift rail.

It should be noted that the sensor 91 may also be an ordinary laser sensor, and in this case, the sensor reflection end 92 is set as a receiving light beam end, in this case, it may be receiving boards covering the lifting range of the light beam emitted by the sensor emission end 91, or it may be receiving devices that lift synchronously with the lifting of the sensor emission end 91, which is not limited by the present invention.

The function of the nozzle protection mechanism 9 includes measuring and calculating the distance of the printing trolley descending to the printing position after batches of objects to be printed are installed and before printing operation, and preventing the upper surface of the objects to be printed from exceeding the safe height to collide with the nozzle during the printing operation.

After the object to be printed is installed and before the printing operation, the head protection mechanism 9 performs detection operation in a manner that , the printing trolley 1 and the sensor 91 are both raised to a highest initial position along the vertical direction, then the sensor 91 detects a distance difference in the vertical direction between the height of a plane where the nozzle hole is located when the printing trolley 1 is at the highest position and the height of a light beam emitted when the sensor 91 is at the highest position through movement, which is denoted as H, in a manner that the control system controls the sensor 91 to move downward along the vertical direction, and after the emitted light beam 90 is blocked by the object to be printed, the control system controls the sensor 91 to stop moving, and then controls the sensor 91 to move upward to a detection position suitable for printing safety (the detection position suitable for printing safety is related to sensor characteristics, such as the width of a light spot), in a manner that the distance from the highest position to the detection position is denoted as H, in a manner that the sensor 91 moves downward to the detection position is denoted as H, in a manner that the distance from the highest position to the detection position is denoted as H, in a third step, in a manner that the distance between the plane where the nozzle hole is located on the nozzle hole of the upper surface of the object to be printed and the upper surface of the object to be printed is denoted as 362 mm, is calculated by software, in a region where the upper detection region of the upper detection region 366 mm of the upper portion of the print area (36.

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 changes may be made in the particular embodiments of the invention described herein without departing from the spirit and scope of the invention as defined in the appended claims.