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,设置在固化装置上方,喷头保护装置包括滑动块、遮光盖板、第一光轴、第二光轴和紫外光安全检测传感器,在固化装置上方沿第一方向设置第一光轴和第二光轴,第一光轴和第二光轴覆盖固化装置的长度方向并分别在固化装置两侧的宽度方向固定,在第一光轴和第二光轴上穿过一滑动块,滑动块可沿第一光轴和第二光轴滑动,滑动块上安装一遮光盖板可随滑动块移动,滑动块的上方安装一紫外光安全检测传感器,用来检测上方是否有待打印物体遮挡从而确保喷头免被照射。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 a spray head protection device and a spray head protection method for an ink-jet printer, which are arranged above a curing device, wherein the spray head protection device comprises a sliding block, a shading cover plate, a optical axis, a second optical axis and an ultraviolet light safety detection sensor, the optical axis and the second optical axis are arranged above the curing device along the direction, the optical axis and the second optical axis cover the length direction of the curing device and are respectively fixed in the width directions of two sides of the curing device, sliding blocks penetrate through the optical axis and the second optical axis, the sliding block can slide along the optical axis and the second optical axis, the shading cover plate is arranged on the sliding block and can move along with the sliding block, and an ultraviolet light safety detection sensor is arranged above the sliding block and is used for detecting whether an object to be printed above is shaded so as to ensure that the spray head is not irradiated.)

The utility model provides a kind of shower nozzle protection device for inkjet printer, set up in solidification equipment top, be used for preventing solidification equipment from curing to the shower nozzle orifice when solidifying the object of waiting to print on it, a serial communication port, shower nozzle protection device includes the sliding block, the shading apron, optical axis, second optical axis and ultraviolet ray safety inspection sensor, set up optical axis and second optical axis along 0 direction above solidification equipment, optical axis and second optical axis cover the length direction of solidification equipment and fix in the width direction of solidification equipment both sides respectively, pass sliding block on optical axis and second optical axis, the sliding block can slide along optical axis and second optical axis, install shading apron on the sliding block and can follow the sliding block and remove, another end of shading apron sets up the initiating terminal at solidification equipment, install ultraviolet ray safety inspection sensor above the sliding block, be used for detecting whether there is the object of waiting to print in the top and shelter from the assurance shower nozzle is protected from shining.

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 1, wherein a printing cross beam is arranged above the object to be printed, and when a printing trolley on the printing cross beam passes above the object to be printed, image-text painting is performed on the object to be printed.

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

5. The showerhead protection device of claim 4, wherein a side baffle is provided outside the broadside of the UV lamp, and a shading side plate is provided outside the broadside of the second UV lamp.

6. The spray head protection device of claim 1, wherein the light blocking cover is flexible opaque strip-shaped web material, which moves along the upper side of the curing device with the movement of the slider, and when the slider is pulled from the starting end to the ending end, the light blocking cover completely blocks the beads of the curing device, and when the slider is pulled from the ending end to the starting end, the light blocking cover gradually opens to gradually leak out of the curing device below.

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

8. The head protection device as claimed in claim 1, further comprising an ultraviolet radiation protection device disposed on the printing cart, wherein the ultraviolet radiation protection device comprises an ultraviolet sensor, a sensing window at the lower end of the ultraviolet sensor receives radiation from the curing device below, is fed back by the ultraviolet sensor when ultraviolet radiation leaks upwards and reaches a trigger threshold set by the ultraviolet sensor, and the system controls the curing device to close and cancel printing.

9, A sprinkler head protection method for the sprinkler head protection device of claim 1, wherein the working process of the sprinkler head protection device is as follows:

a) adjusting the position of a shading cover plate in the spray head protection device to ensure that the curing range exposed upwards by the curing device is an inkjet image-text area on an object to be printed;

b) in the printing process, the spray head protection device detects whether the spray head is in a safe state relative to the curing device:

when the ultraviolet light safety detection sensor detects that the signal is blocked, the object to be printed is positioned above the irradiation area of the curing device and effectively blocks the light emitted by the curing device, and the nozzle of the printing trolley is in a safe state, so that other operations can be performed;

when the ultraviolet light safety detection sensor detects that the signal is not shielded, the ultraviolet light safety detection sensor indicates that the object to be printed is not completely shielded from the area irradiated by the curing device, light rays are irradiated upwards at the moment, if the printing trolley passes through the area, the spray hole of the spray head is damaged by being irradiated, namely the spray head of the printing trolley is in an unsafe state at the moment, the control system controls the curing device to close irradiation, printing is cancelled, and the printing trolley returns to the printing starting position.

10. The nozzle protection method according to claim 9, wherein in step b), when the uv light safety detection sensor detects that the signal is not blocked, the printer further performs an alarm prompt, such as a screen prompt "the uv lamp shade cover plate is incorrectly positioned, please correct, otherwise the print head will be damaged".

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 two modes of Scanning ink-jet printing and -time paper-feeding imaging (One-pass) 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 the 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 nozzle is stationary, the nozzle is connected in series with the printing trolley, and the nozzle is inserted in the direction of the printing trolley, and that the nozzle is high in the width of the ink-jet printing trolley and the nozzle is required to be printed in the printing trolley and the printing trolley.

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.

To achieve the above object, the present invention provides a protection device for a nozzle of an inkjet printer, disposed above a curing device, for preventing the curing device from curing to the nozzle hole of the nozzle when curing an object to be printed thereon, wherein the protection device comprises a sliding block, a light-shielding cover plate, a optical axis, a second optical axis and a safety detection sensor for ultraviolet light, a optical axis and the second optical axis are disposed above the curing device along a 0 direction, a optical axis and the second optical axis cover the length direction of the curing device and are fixed in the width direction of both sides of the curing device, the sliding block passes through on the optical axis and the second optical axis, the sliding block can slide along a optical axis and the second optical axis, the light-shielding cover plate is mounted on the sliding block and can move with the sliding block, the other end of the light-shielding cover plate is disposed at the starting end of the curing device, and a safety detection sensor for ultraviolet light is mounted above the sliding block for detecting whether the object to be.

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 lamp comprises an th ultraviolet lamp and a second ultraviolet lamp, and the th ultraviolet lamp is connected with the second ultraviolet lamp through an ultraviolet lamp connecting plate.

In the spray head protection device, the side baffle is arranged outside the width edge of the ultraviolet lamp, and the shading side plate is arranged outside the width edge of the second ultraviolet lamp.

Among the above-mentioned shower nozzle protection device, the shading apron is flexible light-tight banded coiled material, can move along solidification equipment top along with the removal of sliding block, and when the sliding block pulled to the terminal 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, 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.

Among the above-mentioned shower nozzle protection device, still including setting up the ultraviolet irradiation device on printing the dolly, ultraviolet irradiation device includes ultraviolet sensor, and the response window of ultraviolet sensor lower extreme receives the below solidification equipment's irradiation, and has ultraviolet upwards to spill, reaches the trigger threshold value that ultraviolet sensor set for, just is fed back by ultraviolet sensor, and system control solidification equipment closes to cancel printing.

The invention provides spray head protection methods of the spray head protection device, which is characterized in that the working process of the spray head protection device is as follows:

a) adjusting the position of a shading cover plate in the spray head protection device to ensure that the curing range exposed upwards by the curing device is an inkjet image-text area on an object to be printed;

b) in the printing process, the spray head protection device detects whether the spray head is in a safe state relative to the curing device:

when the ultraviolet light safety detection sensor detects that the signal is blocked, the object to be printed is positioned above the irradiation area of the curing device and effectively blocks the light emitted by the curing device, and the nozzle of the printing trolley is in a safe state, so that other operations can be performed;

when the ultraviolet light safety detection sensor detects that the signal is not shielded, the ultraviolet light safety detection sensor indicates that the object to be printed is not completely shielded from the area irradiated by the curing device, light rays are irradiated upwards at the moment, if the printing trolley passes through the area, the spray hole of the spray head is damaged by being irradiated, namely the spray head of the printing trolley is in an unsafe state at the moment, the control system controls the curing device to close irradiation, printing is cancelled, and the printing trolley returns to the printing starting position.

In the method for protecting the spray head, in the step b), when the ultraviolet light safety detection sensor detects that the signal is not blocked, the printer also carries out alarm prompt, for example, a screen prompts that the position of an ultraviolet lamp shading cover plate is wrong, correction is required, or the spray head is damaged by printing.

The invention uses the spray head protection device, can prevent ultraviolet rays emitted upwards by the curing device from directly irradiating the spray head in the process of curing an object to be printed above by the curing device, prevents spray holes of the spray head from being blocked due to the irradiation of the ultraviolet lamp, and ensures 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.

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 (the second direction) to enable the center line of the sensing window of the ultraviolet sensor 13 in the X-axis direction (the th direction) to be overlapped with the center line of the spray head in the X-axis direction (the th 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 an initial position sensor moving block 19, the initial position sensor 18 for the object to be printed is mounted below the initial position sensor moving block 19 by screws, the initial position sensor moving block 19 is mounted on the 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 for the object to be printed to move along the Y-axis direction, so that a detection window of the initial position sensor 18 for the object to be printed is adjusted to correspond to in 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 ), after LXH1, 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 text return signal, when the initial position sensor 18 for the printing is returned, the ink droplet distance of the ink jet head is accurately calculated, and the ink jet distance of the ink jet head is accurately calculated according to the ink jet distance.

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.