CN114474995A

CN114474995A - Printing device for testing liquid performance by time-delay switching between nozzles and control method thereof

Info

Publication number: CN114474995A
Application number: CN202111665596.3A
Authority: CN
Inventors: 徐四喜; 黄海泉; 杨清华; 瞿卫超
Original assignee: Dongguan Tuchuang Intelligent Manufacturing Co Ltd
Current assignee: Dongguan Tuchuang Intelligent Manufacturing Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-05-13
Anticipated expiration: 2041-12-30
Also published as: CN114474995B

Abstract

The invention belongs to the technical field of printing, solves the problems of small volume range and large limitation of tested liquid in a printing device, and provides a printing device for testing liquid performance by time-delay switching between spray heads and a control method thereof. Wherein, the printing device is used for switching at least two kinds of spray heads with different liquid spraying amount ranges to spray liquid according to preset time sequence so as to test the liquid performance, and the printing device comprises: the number of the nozzle driving plates is consistent with the type of the nozzles, and each nozzle driving plate is used for correspondingly driving one nozzle to spray liquid; a main control panel; and one end of the delay switching circuit is connected with the main control board, and the other end of the delay switching circuit is connected with one of the at least two sprayer drive boards. The invention has the advantages of capability of simultaneously driving two or more than two nozzles, wide spraying volume range, high applicability, accurate liquid performance test and the like.

Description

Printing device for testing liquid performance by time-delay switching between nozzles and control method thereof

Technical Field

The invention relates to the technical field of printing, in particular to a printing device for testing liquid performance by time-delay switching between spray heads and a control method thereof.

Background

Printing is a technology of spraying liquid (such as ink, coating, processing liquid, etc.) on a printing medium by means of spraying, and patterns, characters, etc. are formed on the printing medium to play a role in decorating and marking the printing medium. During the printing process, it is necessary to set appropriate ejection parameters (such as waveforms) so that the liquid forms a precise and stable printing pattern on the surface of the printing medium. When appropriate ejection parameters are set, the performance of the liquid (such as performance tests of ink precision, ink flying, fluency and the like) is usually required to be tested, and the appropriate ejection parameters are set according to the performance of the liquid, so that a printing pattern with higher precision and better performance can be formed in the printing process.

The liquid performance test is generally to eject printing liquid on a printing medium by using a printing apparatus to form a test pattern on the printing medium, and compare the test pattern with a reference pattern to obtain the liquid performance, thereby providing a basis for setting ejection parameters.

In order to obtain more accurate liquid performance and meet the ejection parameters of various devices, if the liquid performance corresponding to different ejection volumes needs to be tested, the liquid is generally required to be ejected and printed by a plurality of printing devices so as to test the liquid performance corresponding to the different ejection volumes. This test method is capable of testing the corresponding fluid performance for different ejection volumes, but requires multiple printing devices when the range of variation of the ejection volumes needs to be tested is wide. Therefore, the existing single printing device has the problems of small volume range of the tested liquid and large limitation.

Disclosure of Invention

In view of this, the embodiment of the present invention provides a printing apparatus for testing liquid performance by time-delay switching between nozzles and a control method thereof; the problems that the volume range of tested liquid is small and limitation is large in the existing printing device are solved.

A first aspect of the present invention provides a printing apparatus for testing liquid performance by switching at least two kinds of heads different in liquid ejecting amount range to eject liquid at a predetermined timing, the printing apparatus comprising: the number of the nozzle driving plates is consistent with the type of the nozzles, and each nozzle driving plate is used for correspondingly driving one nozzle to spray liquid; a main control panel; one end of the delay switching circuit is connected with the main control board, and the other end of the delay switching circuit is connected with one of the at least two sprayer drive boards; when the main control board controls a first sprayer drive board in the at least two sprayer drive boards to drive a corresponding first sprayer in the at least two sprayers to spray a specified amount of liquid through the delay switching circuit, stopping spraying the liquid; after the time delay switching circuit times to a preset time, the time delay switching circuit switches and is connected to a second spray head drive plate corresponding to a second spray head of at least two spray heads so as to establish connection between the main control board and the second spray head drive plate, and the main control board controls the second spray head drive plate to drive the second spray head to spray liquid through the time delay switching circuit.

Further, before the time delay switching circuit is connected with the second sprayer driving plate and after the main control board is disconnected with the first sprayer driving plate corresponding to the first sprayer, the main control board zeroes and resets the second sprayer.

Further, the printing apparatus further includes: the liquid observation mechanism comprises a liquid observation mechanism and an observation control plate connected with the main control plate, wherein the observation control plate controls the liquid observation mechanism to observe liquid sprayed by various spray heads.

Further, the delay switching circuit includes: a first switching sub-circuit and a second switching sub-circuit; the first switching sub-circuit is connected with the first nozzle driving plate, and the second switching sub-circuit is connected with the second nozzle driving plate.

Further, the first switching sub-circuit comprises: the first time relay is used for controlling the first spray head to start after first preset time; the second switching sub-circuit comprises: and the second time relay is used for controlling the second spray head to start after second preset time.

Further, the first switching sub-circuit further comprises a first intermediate relay; the second switching sub-circuit comprises: and a second intermediate relay.

A second aspect of the present invention provides a method for controlling a printing apparatus for testing liquid performance by time-lapse switching between heads, the printing apparatus comprising: at least two kinds of spray heads capable of spraying different amounts of liquid, wherein the at least two kinds of spray heads comprise: a first type of spray head and a second type of spray head; a first nozzle driving plate corresponding to the first type of nozzle; a second nozzle driving plate corresponding to the second type of nozzle; a main control panel; the control method comprises the following steps: after the main control board controls the first nozzle driving board to drive a first type of nozzle to spray liquid, the first nozzle driving board is controlled to send a feedback signal to the main control board; after the main control board receives the feedback signal, the main control board controls the main control board to be disconnected with the first sprayer driving board; and the main control board sends a delay driving signal to the second sprayer driving board to control the second sprayer driving board to delay for a preset time and then drive the second sprayer to spray liquid.

Further, before the main control board controls the second nozzle driving board to drive the second nozzle to spray liquid, and after the main control board is disconnected from the first nozzle driving board, the method further includes: and the main control board is used for zeroing and resetting the second spray head.

Further, the main control board zeroing and homing the second type of spray heads comprises: the main control board controls the sprayer driving board to pre-zero the second sprayer in a first time; after the sprayer driving plate pre-zeros the second sprayer; and the main control board controls the second type of spray head to carry out final zero setting on the second type of spray head.

Further, the printing apparatus further includes: the liquid observation mechanism and the observation control plate are connected with the main control plate; before the main control board zeroes and resets the second sprayer, the method further comprises the following steps: the main control board controls the first spray head driving board to drive a first spray head to spray liquid towards the liquid observation mechanism; and meanwhile, the main control board controls the observation control board to drive the liquid observation mechanism to observe the liquid sprayed by the first spray head.

In conclusion, the beneficial effects of the invention are as follows:

according to the first aspect of the invention, as the two different nozzles are arranged, liquid drops with a wider volume range can be obtained, and the two sets of nozzle driving plates are arranged simultaneously, wherein the nozzle driving plates correspond to each nozzle one by one; each spray head is independently controlled, so that the spray range is widened, the spray is accurately controlled, and the printing precision is improved; the problems that the printing equipment in the prior art is small in liquid volume range and large in limitation in testing are solved. In the second aspect, a delay switching circuit is arranged between two sprayer driving plates, and the delay switching circuit can realize delayed power-off when being disconnected with the first sprayer in the switching process; and when the main control board is connected with the second nozzle drive board, the second nozzle drive board is conducted in a delayed manner. Therefore, when two different types of spray heads are switched, due to the fact that time delay exists before connection, the various spray heads are stabilized within the time delay, and ink splashing and the like caused by instability of the spray heads when the first type of spray head sprays liquid are avoided; in addition, the second type of nozzle does not return to the initial position, so that the ink jetting state of the second type of nozzle is not in the optimal state, the jetting effect is not ideal, and the testing performance of the liquid is affected. Therefore, compared with the prior art, the invention is provided with two different types of spray heads and the time delay switching circuit, thereby ensuring that the liquid performance in a larger range can be tested, improving the applicability of the printing device and ensuring the test effect of the liquid performance; when the ink is used for printing, better printing effect can be ensured. Therefore, the invention has the advantages of capability of simultaneously driving two or more than two nozzles, wide spraying volume range, high applicability, accurate liquid performance test and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.

FIG. 1 is a schematic diagram of a printing apparatus according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a printing apparatus according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of a delay switching circuit according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a printing apparatus according to a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a printing apparatus with a housing removed according to an embodiment of the present invention;

FIG. 6 is an exploded view of a printing cart according to an embodiment of the present invention;

FIG. 7 is a front view of a printing apparatus with a housing removed in accordance with one embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a printing apparatus with a housing removed according to an embodiment of the present invention;

FIG. 9 is a schematic view of a printing apparatus with a housing removed according to an embodiment of the present invention;

FIG. 10 is a schematic view of fluid observation according to one embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a fluid observing mechanism according to an embodiment of the present invention;

FIG. 12 is an exploded view of a fluid observation mechanism according to an embodiment of the present invention;

FIG. 13 is a schematic view of another perspective of the liquid observing mechanism according to the first embodiment of the present invention;

FIG. 14 is a flowchart of a method according to a second embodiment of the present invention.

In the figure:

1. a working platform; 11. a support frame; 110. an accommodating chamber; 2. printing the trolley; 21. a first type of spray head; 22. a second type of spray head; 23. a carrier; 24. a zero setting mechanism; 241. a force application part; 242. a screw rod; 25. a frame body; 3. a second drive mechanism; 4. A first drive mechanism; 41. a cross beam; 5. a liquid observation mechanism; 51. an observation space; 52. a housing; 53. a collecting part; 54. A cover body; 55. a waste liquid collection mechanism; 56. a leak portion; 57. mounting a plate; 58. an adjustment assembly; 6. a liquid scraping mechanism; 61. a liquid receiving tank; 62. a drainage structure; 7. a carrying mechanism; 8. placing a rack; 9. a housing; 10. and (5) original liquid bottles.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In case of conflict, the embodiments and features of the embodiments of the present application may be combined with each other and are within the scope of the present application.

The printing device provided by the invention relates to liquid performance test, and the liquid comprises one or more of white ink, color ink, gloss oil, coating and the like for printing. The present invention will be described in detail below with reference to ink as the liquid. Other liquids are consistent in principle in performance testing, with the specific difference that the printing material is different, the liquid used is different, and thus the ejection parameters required to be set are different.

The present invention is described in further detail below with reference to fig. 1-14.

Example one

The embodiment of the invention provides a printing device for testing liquid performance by time-delay switching among spray heads, solves the technical problem of instability of a multi-spray-head switching system in the prior art, is used for switching at least two spray heads with different liquid spraying amount ranges to spray liquid according to a preset time sequence so as to test the liquid performance, and has the advantages of stably spraying the liquid and accurately testing the liquid performance. Wherein the tested liquid properties include: at least one of the satellite number of the ink dots, the printing straightness of the ink dots and the uniformity of the size of the ink dots can be obtained, and certainly, in order to obtain more accurate liquid performance, other liquid testing performances such as fluency can also be included, and the specific test to be applied is not limited herein, and all parameters capable of representing the printing liquid performance are within the protection scope of the invention. Specifically, the liquid performance test is to control a single-row nozzle to spray dot images formed once on a printing medium, and observe the characteristics corresponding to each dot image to obtain the performance of the ink. In order to verify the corresponding performance of the ink under various jetting volumes, different jetting amounts are jetted by the jet heads to form three points, namely a large point, a middle point and a small point, and then the point image characteristics of each point are observed. In addition to this, the apparatus method can be used to detect nozzle abnormalities.

It is noted that, in order to facilitate the explanation of the present invention, the present invention is explained with reference to two different kinds of nozzles; in actual use, the number of the spray heads is not limited by the application, and the switching principles of the various spray heads are consistent.

As shown in fig. 1, the printing apparatus includes: the number of the nozzle driving plates is consistent with the type of the nozzles, each nozzle driving plate is used for correspondingly driving one nozzle to spray liquid, and a waveform for controlling the corresponding nozzle to spray ink is integrated in each nozzle driving plate; and a main control panel controlling the operation of the entire printing apparatus. The main control board controls the start of each nozzle driving board and controls the nozzles to spray liquid; one end of the delay switching circuit is connected with the main control board, and the other end of the delay switching circuit is connected with one of the at least two nozzle drive boards; when the main control board controls a first sprayer drive plate in the at least two sprayer drive plates to drive a corresponding first sprayer 21 in the at least two sprayers to spray a specified amount of liquid through the delay switching circuit, stopping spraying the liquid; and after the time delay switching circuit times to preset time, the time delay switching circuit is switched and connected to a second sprayer drive plate corresponding to a second sprayer 22 in the at least two sprayers so as to establish connection between the main control board and the second sprayer drive plate, and the main control board controls the second sprayer drive plate to drive the second sprayer 22 to spray liquid through the time delay switching circuit.

In this embodiment, in the first aspect of the present invention, two different nozzles are provided, so that droplets in a wider volume range can be obtained, and two sets of nozzle drive plates are provided simultaneously, wherein the nozzle drive plates correspond to each of the nozzles one to one; each spray head is independently controlled, so that the spray range is widened, the spray is accurately controlled, and the printing precision is improved; the problems that the printing equipment in the prior art is small in liquid volume range and large in limitation in testing are solved. In the second aspect, a delay switching circuit is arranged between two sprayer driving plates, and the delay switching circuit can realize delayed power-off when being disconnected with the first sprayer in the switching process; and when the main control board is connected with the second nozzle drive board, the second nozzle drive board is conducted in a delayed manner. Therefore, when two different types of nozzles are switched, because the time delay is provided before the nozzles are switched on, the various nozzles are stabilized within the time delay, and the unstable ink flying of the nozzles and the like when the first type of nozzles 21 jet liquid are avoided; in addition, the second ejection head 22 does not return to the initial position, resulting in that the ink ejection state of the second ejection head 22 is not in the optimal state, resulting in that the ejection effect is not ideal, thereby affecting the test performance of the liquid. Therefore, compared with the prior art, the invention is provided with two different types of spray heads and the time delay switching circuit, thereby ensuring that the liquid performance in a larger range can be tested, improving the applicability of the printing device and ensuring the test effect of the liquid performance; when the ink is used for printing, better printing effect can be ensured. Therefore, the invention has the advantages of capability of simultaneously driving two or more than two nozzles, wide spraying volume range, high applicability, accurate liquid performance test and the like.

As shown in fig. 1 and 4, the printing apparatus further includes: and the change-over switch is connected between each sprayer drive plate and the main control plate and is used for communicating the main control plate with one sprayer drive plate.

In this embodiment, the switch is a manual knob switch, and the first head driving plate or the second head driving plate is switched by rotating the switch. Specifically, the knob switch is disposed outside the housing 9, specifically at the position of the operation assembly, so as to facilitate the operation of a worker.

In other embodiments, the selector switch is a circuit board switch, and the conduction of the selection circuit controls the conduction between the main control board and the nozzle drive board, so that the selection of each nozzle drive board is switched. In other embodiments, the switch may be a component switch, or may be a control system port manual switch, which is not limited herein.

Further, before the time-delay switching circuit is connected to the second head drive plate, and after the main control board is disconnected from the first head drive plate corresponding to the first type of head 21, the main control board resets the second type of head 22.

In this embodiment, referring to fig. 5 and fig. 6, the main control board directly performs the zeroing and homing on the second nozzle 22, and specifically, the main control board can control the two nozzles to move along the X-axis, drive the nozzles to move up and down along the Z-axis, and control the zeroing of the nozzles. The main control board zeroing and resetting the second nozzle 22 includes: the second spray head 22 is driven to move to the initial position along the X axis, and meanwhile, the relative position relation of the second spray head 22 on the Z axis is controlled and adjusted. The second spray head 22 is directly controlled by the main control board, so that the time delay of signal transmission is reduced, and the control speed is accelerated.

Further, with reference to fig. 5 and 7, the printing apparatus further includes a cross beam, and the printing apparatus is at least provided with a zeroing area 500 and a printing area 600 that are independent of each other along a length direction of the cross beam 41, when the printing cart 2 is located in the printing area 600, the nozzles eject liquid onto the printing medium, and when the printing cart 2 is located in the zeroing area 500, the nozzles to be ejected in the printing cart 2 are zeroed and returned; the cross beam 41 is connected with the printing trolley 2, the zeroing area 500 is arranged adjacent to the printing area 600, and zeroing means the printing position of the corresponding sprayer at the beginning of returning; which is equivalent to the initialization of the spray head to be sprayed. The first aspect of zero setting of the spray head is to ensure that the relative position of the spray head in the Z-axis direction is determined, namely the height position of the corresponding spray head is fixed. The second aspect is to ensure that the liquid corresponding to the nozzles of the nozzles is in an initialized state, so as to avoid idle printing caused by the liquid of the nozzles being influenced and dropped during the last printing process of the nozzle to be sprayed.

The printing apparatus provided by the present embodiment includes: the main control board controls the first driving mechanism 4 to drive the printing trolley 2 to reciprocate between the zeroing area 500 and the printing area 600 along the cross beam 41; the first driving mechanism 4 is installed on the cross beam 41, and the output end of the first driving mechanism 4 is connected with the printing trolley 2. After the current liquid spraying nozzle is located in the printing area 600 and sprays liquid to the printing medium, the first driving mechanism 4 drives the printing trolley 2 to the zeroing area 500, and the next liquid spraying nozzle to be sprayed is zeroed.

The zeroing region 500 includes: a pre-zeroing zone and a final zeroing zone; when the printing trolley 2 is positioned in the pre-zero area, the nozzle of the liquid to be sprayed in the printing trolley 2 is pre-zero and reset, and when the printing trolley 2 is positioned in the final zero area, the nozzle of the liquid to be sprayed in the printing trolley 2 is finally zero and reset.

In this embodiment, the pre-zeroing comprises: the main control board controls the lifting of the spray head to be sprayed and adjusts the relative position of the corresponding spray head Z axis. After entering the final zero setting area, the printing trolley 2 is stable, and finally the spray head to be sprayed is subjected to final zero setting. Because the pre-zeroing area is arranged and the pre-zeroing of the nozzle to be printed is carried out, the printing trolley 2 is pre-zeroed within the time of the returning process, the zeroing speed is increased, and the speed for testing the performance of the liquid is facilitated. And a final zero setting area is also arranged, zero setting is carried out after the printing trolley 2, the position of the spray head in the Z-axis direction is determined at the pre-zero setting position, and zero setting is carried out on the liquid of the spray head in the liquid to be sprayed at the final zero setting position, namely, the liquid of the spray head nozzle is zero set, so that the spray head of the liquid to be sprayed can be ensured to return to the optimal state. The zero setting speed is accelerated, the zero setting effect is guaranteed, and the liquid performance testing effect is further guaranteed.

Further, the first driving mechanism 4 drives the printing trolley 2 to move from the printing area 600 to the pre-zeroing area at a first speed, and the first driving mechanism 4 drives the printing trolley 2 to move from the pre-zeroing area to the final zeroing area at a second speed; wherein the first speed is greater than the second speed.

In this embodiment, after the first type of nozzles 21 finish ejecting liquid, the printing cart 2 is controlled to move, and at this time, the printing cart 2 is in an accelerated state; when the printing trolley 2 enters the pre-zero area, the printing trolley 2 starts to decelerate, and at the moment, the pre-zero setting is started for the next nozzle to be printed. Furthermore, the first driving mechanism 4 drives the printing trolley 2 to enter the final zero setting area from the pre-zero setting area in an acceleration mode; where the acceleration is negative.

Referring to fig. 5 and fig. 6, the two nozzles of the present embodiment are disposed on the print carriage 2, and each of the nozzles sequentially ejects liquid toward the print medium, and the range of the amount of liquid ejected by each of the nozzles is at least partially not overlapped; at least two different kinds of heads, the kinds of heads involved in the present invention are classified according to the range of the amount of ink that can be ejected; referring to FIG. 6, for example, the first nozzle 21 can eject ink in an amount ranging from 1p l to 3p l; the second type of head 22 can eject ink in an amount ranging from 5p l to 7p l (of course, the amount of ink ejected from the head is not limited to this range). The fact that the ranges of the amounts of the sprays that can be ejected by the heads are at least partially misaligned means that the three points, large, medium and small, of the amounts of the sprays can be such that the large point in one head is the same as the small point in the other head. Of course, may be different. In addition, in this embodiment, two different types of nozzles are preferably provided, including two types of nozzles G5I and G5, in other embodiments, multiple types of nozzles may be provided, and the number of each type of nozzle is not limited. It is noted that three different volumes of droplets may be ejected from each ejection head. And a plurality of different spray heads are arranged, so that the range of the liquid which is sprayed by the corresponding spray head in a single time in the whole printing equipment can be wider.

Further, as shown in fig. 6, at least two kinds of nozzles include: a first type of head 21 and a second type of head 22; the first nozzle is positioned in the printing area 600 and sprays first liquid towards a first area of the printing medium to form a first test image; the second type of nozzles 22 are positioned in the print zone 600 to eject a second liquid toward a second area of the print medium to form a second test image; the first detection image and the second detection image are not coincident at all.

In this embodiment, the first liquid is different from the second liquid; the judgment of whether the liquids are the same is based on the requirement of the test liquid for liquid drops. The performance of the liquid as a requires the ejection amount to be 7p l; but the injection quantity demand of the B liquid is 2.5p l; generally, different kinds of liquid, gloss oil, white ink, color ink, and coating require different ejection amounts. The two liquids are defined as different liquids. Of course, in other embodiments, the first liquid and the second liquid may be the same liquid. The first area and the second area can be partially overlapped or partially not overlapped, and the first test image and the second test image are completely not overlapped, so that the first test image and the second test image can independently exist, the first test image and the second test image are prevented from being interfered with each other, the test images can be conveniently identified, and the test precision of the liquid performance is improved.

As shown in connection with fig. 5, the printing apparatus further includes: a liquid receiving tank 61; the liquid receiving tank 61 is correspondingly arranged below the zero adjustment area 500; the working platform 1 is used for installing the liquid receiving tank 61; and the cross beam 41 is erected on the working platform 1.

In the present embodiment, the work table 1 divides the entire printing apparatus into upper and lower halves. The upper half part is a common operation area, and the lower half part is a placement area; the whole printing equipment is reasonable in partition and compact in structure.

In this embodiment, the sprayer can produce the waste liquid in the zero setting process, and the waste liquid that produces when setting up and connect cistern 61 to accept the regulation sprayer avoids polluting operational environment. The upper end surface of the liquid receiving groove 61 is higher than or equal to the upper end surface of the bearing mechanism 7. In the present embodiment, the upper end surface of the liquid receiving groove 61 is selected to be flush with the upper end surface of the bearing mechanism 7. The liquid in the liquid receiving tank 61 is prevented from splashing out of the printing medium carried by the carrying mechanism 7, so that the test image is prevented from being influenced, and the liquid performance test effect is prevented from being influenced.

Further, with reference to fig. 5 and 6, the printing apparatus further includes: the zero setting mechanism 24 is arranged between the first driving mechanism 4 and the printing trolley 2, and is used for setting zero of each spray head; the first driving mechanism 4 drives the printing trolley 2 to move from the printing area 600 to the zeroing area 500, and meanwhile, the main control board controls the zeroing mechanism 24 to pre-zero the next printing nozzle.

In the present embodiment, in conjunction with fig. 6, the zero setting mechanism 24 includes: zero set motor and lead screw 242, lead screw 242 are connected with the support body 25 of installation shower nozzle, rotate lead screw 242 and make support body 25 lifting support body 25 go up and down in order to drive the shower nozzle, realize tentatively zero set.

In other modified embodiments, as shown in fig. 2, the printing apparatus further includes: spout the car control panel, spout the car and be used for controlling to print 2 movements of dolly, spout the car control panel and directly be connected with the master control board, the control of this embodiment control shower nozzle spouts car control panel lug connection master control board, and master control board lug control prints the motion of dolly 2, has saved the control and has spouted the space of installing at printing dolly 2 of car control panel. In addition, the main control board directly controls the printing trolley 2 and the like, so that the time for the main control board to send signals is directly reduced, the time delay of the reaction of the printing trolley 2 is reduced, and the printing efficiency is improved.

Further, as shown in fig. 7, the device is further provided with an observation area 700 along the length direction of the cross beam 41; the zeroing zone 500, the printing zone 600, and the observation zone 700 cover partial areas below and above the cross beam 41; specifically, the cross beam 41 is divided into several regions along the length direction thereof, wherein each region corresponds to the zero region 500, the printing region 600 and the observation region 700. The printing apparatus further includes: the liquid observation mechanism 5 and an observation control board connected with the main control board, wherein the observation control board controls the liquid observation mechanism 5 to observe the liquid sprayed by various spray heads.

In the present embodiment, the liquid observing mechanism 5 observes the ejection condition of the head, feeds back the observed result to the main control board, and then the main control board controls the operation of the head driving board according to the feedback result to adjust the waveform control and the like of the head driving board. The observation control panel is connected with the main control panel, and the main control panel controls the operation of the observation control panel. The observation control panel is directly controlled by the main control board card, so that the whole printing equipment is controlled by a program conveniently, and the liquid observation mechanism 5 and the spray head can be well controlled to be matched with each other.

With reference to fig. 7 and 9, the liquid observing mechanism 5 includes a collecting portion 53 and an observing space 51 for the printing cart 2 to pass through, and two opposite sides of the observing space 51 have openings, and one of the openings is located at a side of the observing mechanism close to the printing area 600; the driving mechanism drives the printing cart 2 to enter or leave the observation space 51 through the two openings, respectively, so that the liquid is ejected from the observation space 51, and the liquid droplet image is collected by the collecting unit 53.

In this embodiment, the printing cart 2 ejects liquid corresponding to the observation space 51, so that the observation space 51 in the observation mechanism can just collect the flying condition of the liquid. The observation space 51 means that the carriage 2 ejects the liquid corresponding to the observation space 51 at a predetermined position. The size of the observation space 51 corresponds to the width of the carriage 2 and is slightly larger than the width of the carriage 2. And the specific position of the observation space 51 is set corresponding to the position of the cross beam 41; the printing trolley 2 can spray liquid to the observation space 51 by moving to the observation space 51 along the cross beam 41, the structure is ingenious, and the movement control program is simple. Furthermore, the two ends of the observation space 51 are opened, and the opening is close to the printing area 600, and there are two possibilities in the implementation process of the present invention: one is that after the printing trolley 2 is positioned in the printing area 600 and printing is finished, the first driving framework drives the printing trolley 2 to enter the observation space 51 from an opening at one side; alternatively, after the printing cart 2 is located in the observation area 700 to eject the liquid, the first driving structure drives the printing cart 2 to leave the observation space 51 from an opening on one side to move to the printing area 600 to realize the printing function. Therefore, the liquid observation mechanism 5 arranged in this way enables the printing trolley 2 to move along the cross beam 41, and the switching between the printing area 600 and the observation area 700 can be realized without lifting the printing trolley 2, and in addition, because the spray head can be influenced to a certain extent in the lifting process of the zero point of the spray point, the printing trolley 2 moves along a straight line, and two functions can be directly switched without resetting the zero point, so that the liquid observation mechanism has the advantages of simple operation, ingenious structure and high test speed.

Further, referring to fig. 12 and 13, the liquid observing mechanism 5 includes a housing 52, and the housing 52 forms an observing space 51.

In the present embodiment, the liquid observing mechanism 5 includes a main unit, which is accommodated inside the casing 52, and the casing 52 is substantially a hollow rectangular parallelepiped; and the longitudinal direction of the housing 52 coincides with the observation direction of the acquisition part 53. The shell 52 wraps the host to achieve the function of protecting the host; an observation space 51 is formed on the housing 52 so that the printing mechanism ejects liquid to the observation space 51.

Preferably, the liquid observing mechanism 5 further includes a collecting portion 53, the observing space 51 is formed in a notch shape, and the collecting portion 53 is provided on a side wall of the observing space 51.

In this embodiment, the observation space 51 is in a notch shape, and after the print carriage 2 is clamped above the notch, the opposite surface of the collecting part 53 blocks light to directly irradiate the collecting part 53, so that the pollution of ambient light is reduced, and the test result of liquid flight is further improved.

Referring to fig. 9 and 10, the bottom of the observation space 51 is lower than or flush with the upper end surface of the printing medium carried by the carrying mechanism 7. The distance h from the upper end surface of the bearing mechanism 7 to the spraying surface of the spraying head for spraying liquid₁(ii) a The height from the bottom of the observation space to the ejection surface is h₂(ii) a Wherein h is₂Greater than h₁. The bottom of observing space 51 is less than the up end of print medium, consequently, observes the motion space that space 51 provided for the motion of printing dolly 2, is convenient for print dolly 2 along a rectilinear motion to observing space 51, realizes not needing to zero again just can directly switch over two functions, consequently, has easy operation, the ingenious and fast advantage of test speed of structure.

Further, referring to fig. 10, the collection range of the collection unit 53 covers the height from the upper end surface of the support mechanism 7 to the ejection surface of the ejection head that ejects the liquid.

In the embodiment, the acquisition range can acquire all movement paths of the liquid ejected by the ejection head in the process of moving away from the nozzle until the liquid is landed on the printing medium, so that all changes of the whole liquid drop in the printing process can be observed and obtained.

Further, referring to fig. 12 and 13, the liquid observing mechanism 5 further includes a cover 54, and the cover 54 is provided in the observation space 51.

In this embodiment, the cover 54 is adapted to the observation space 51 to cover the observation space 51, so as to avoid polluting the lens of the collecting unit 53 in idle time and affecting the next observation quality.

The liquid observation mechanism 5 is provided with a leak portion 56, the leak portion 56 communicates with the observation space 51, and the liquid ejected from the head enters the waste liquid collection mechanism 55 from the leak portion 56.

In this embodiment, the leakage part 56 is disposed at the bottom of the observation space 51, and after the printing trolley 2 ejects liquid corresponding to the observation space 51, the collection part 53 directly observes the flying condition of the liquid, and then the liquid ejected from the printing trolley 2 directly falls into the waste liquid collection mechanism 55, and the waste liquid collection mechanism 55 receives the liquid, so as to avoid splashing of the liquid all around and cause environmental pollution.

In addition, the axis of the collecting part 53 is higher than the upper end surface of the bearing mechanism 7, and at this time, the collecting range of the collecting part 53 covers the spraying surface of the liquid sprayed by the spraying head and the hollow part 56; specifically, the upper end of the leak portion 56 is covered. The liquid is ejected from the nozzle of the nozzle, passes through the observation space 51 and enters the leaking portion 56, and the collecting portion 53 can collect the movement path of the liquid drop in the whole process to observe the flying condition of the liquid drop in the whole process. Therefore, the provision of the leak portion 56 also has an increased range of observation, and therefore, an increase in the height of the ejected nozzle to the surface of the printing medium can also be observed by the apparatus, and thus, the liquid observation performance can also be measured at the same time for the flying of the liquid in the printing method of high head, which makes the application range of the entire apparatus wider.

Further, with reference to fig. 11 to 13, the liquid observing mechanism 5 further includes: and the adjusting assembly 58 is used for adjusting the relative position of the collecting part 53 and the printing trolley 2, so that the ejection surface of the ejection head is in the collecting range of the collecting part 53.

In the present embodiment, the liquid observing mechanism 5 further includes an adjusting component 58, and the adjusting component 58 is used for adjusting the relative position of the collecting part 53 and the printing trolley 2.

Specifically, the liquid observing mechanism 5 further includes: and the mounting plate 57 is used for mounting the shell 52 of the liquid observation mechanism 5, and the screw rod is connected with the shell 52 and drives the shell 52 to reciprocate. The adjusting assembly 58 is disposed on one side of the housing 52 in the length direction, and the housing 52 of the adjusting assembly liquid observing mechanism 5 moves along the direction of the arrow X, so that the observing space 51 corresponds to a specific ink jet head, and therefore, the specific ink jet head can be observed without providing an excessively wide observing space 51.

In other embodiments, the distance of the acquisition part 53 from the nozzle row corresponding to the ejection liquid can be adjusted by the adjustment assembly 58.

Preferably, the adjusting assembly 58 is connected to the housing 52 for adjusting the distance from the collecting part 53 to the nozzle row for ejecting the liquid within a preset range according to the position of the nozzle row for ejecting the liquid. So as to ensure that the flight condition of the liquid drop can be accurately observed by the acquisition part 53.

If the preset range of the distance from the pickup unit 53 to the nozzle row for ejecting the liquid is 10 mm, the distance between the observation space 51 of the pickup unit 53 and the nozzle row in the first row is 10 mm when the nozzle row in the first row is observed, and the pickup unit 53 observes the state of the liquid droplets ejected from the corresponding nozzle row after the nozzle row in the first row is ejected. Then, the second row of nozzles is controlled to spray, the shell 52 is controlled to drive the collecting part 53 to move 1 mm according to the distance 1 mm between each row of nozzle rows, the distance from the observation space 51 position established for observation to the second row of nozzles is kept at 10 mm, the distance of each observation is consistent, and therefore the error of the observation result is small. Since the distance between the nozzle rows is small, the adjustment accuracy of the adjustment assembly 58 is high, and the adjustment assembly 58 is set in a motor-driven screw manner.

Specifically, the direction of the nozzle row of the head (parallel to the direction of the first drive mechanism, i.e., the direction of arrow X in fig. 3) is perpendicular to the observation direction of the liquid observation mechanism 5.

In this embodiment, the number of rows of nozzle rows of a single head corresponds to K, C, M, Y four-color ink, that is, the head ejects liquid in a single row of nozzle rows and the observation unit observes ejection in a single pass in a single row of nozzle rows. Avoid the observation confusion caused by the one-time injection of a plurality of rows of nozzle rows.

The printing apparatus further includes: a bearing mechanism 7 for bearing the printing medium and a second driving mechanism 3, wherein the bearing mechanism 7 is arranged on the working platform 1, and the bearing mechanism 7 is arranged corresponding to the printing area 600. The main control board controls the second driving mechanism 3 to drive the bearing mechanism 7 to reciprocate along the direction of an arrow Y in fig. 3, and drives the printing medium and the printing trolley 2 to reciprocate to realize reciprocating scanning. In addition, the driving direction of the first driving mechanism 4 is perpendicular to the scanning direction of the second driving mechanism 3, and the scanning direction of the second driving mechanism 3 is parallel to the observation direction of the liquid observation mechanism 5, so that the whole device is more compact. In addition, the first driving mechanism 4 drives the printing trolley 2 to move along the driving direction of the first driving mechanism 4, so that the printing trolley 2 can step relative to a printing medium, and the printing width of the printing medium is increased.

The main control board controls the printing trolley 2 to move on the cross beam 41 along a first direction in a V shape₁Is controlled to drive the printing medium by the second driving mechanism 3 to drive V₂And the printing carriage 2 reciprocates. Wherein V₂Greater than V₁. Because the printing medium is driven to move at a higher speed, when the printing needs to be stopped, the quality of the printing medium is much smaller than that of the printing trolley 2, so that compared with the prior art, the printing trolley is more convenient to control the printing medium to stop, the printing program is convenient to control, and the printing quality is favorably ensured. The technical problems that the printing trolley 2 is difficult to control to stop and even the printing quality is poor due to the fact that the printing trolley 2 is high in mass in the existing printing device are solved; on the other hand, the printing trolley 2 is only driven to move in a stepping mode, excessive power is not needed to drive the printing trolley 2 to move at a high speed, the printing trolley 2 is easy to control to stop, energy consumption for driving the printing trolley 2 is reduced, and an energy-saving effect is achieved; has the advantages ofConvenient control, high-precision printing, energy conservation and the like.

As shown in fig. 5, the printing apparatus further includes: the liquid scraping mechanism 6 comprises a scraper, the length direction of the scraper faces the direction of the nozzle row of the spray head, and the liquid scraping direction is parallel to the scanning direction. A liquid receiving groove 61 is formed below the liquid scraping mechanism 6, a liquid guiding structure 62 is arranged in the liquid receiving groove 61, and the liquid guiding structure 62 is wave-shaped; after the liquid is separated from the spray head, the liquid slides down to the bottom of the liquid receiving tank 61 along the inclined surface of the liquid guiding structure 62. The wiper mechanism 6 may be used to wipe off accumulated ink at the nozzles and receive waste ink. On the other hand, the liquid scraping mechanism 6 is arranged on one side of the second driving mechanism 3, and waste ink generated when the printing trolley 2 is zeroed is received by the ink receiving groove of the liquid scraping mechanism 6, so that one mechanism has multiple purposes, and the use of raw materials is saved; on the basis of ensuring the compact structure of the whole printer, the production cost is reduced.

Further, as shown in fig. 8, the printing apparatus further includes a liquid feeding mechanism, and the liquid feeding mechanism sucks the liquid from the original liquid bottle 10 to the spray head, so that the spray head sprays the liquid. Be provided with support frame 11 under work platform 1, the support frame is formed with the work platform cooperation and holds chamber 110, holds and is provided with rack 8 in the chamber 110, and rack 8 is used for placing the former bottle of ink. Set up rack 8, directly extract liquid from the former bottle 10 of liquid, and the connection can be dismantled with the former bottle 10 of liquid to the inlet liquid mechanism. The liquid does not pass through the primary liquid box, so that when the ink needs to be replaced, the original liquid bottle 10 printed at present is directly taken down, and then the original liquid bottles 10 of other types are replaced, so that the liquid is convenient to replace; the technical problems that the existing printing equipment is complicated in test liquid replacement and complex in operation are solved. The device has the advantages of high-precision liquid performance testing, convenience in liquid replacement, simplicity in operation and the like.

The printing apparatus further includes: and the switch is connected with the main control board to expand the number of the network ports of the main control board.

In this embodiment, the network ports of the main control board are added through the switch, and generally, only two network ports of the main control board need to be additionally expanded, which is relatively troublesome. The invention adopts a mode of adding switches to increase network ports. In the embodiment, two kinds of spray heads are arranged, after the switch is added, the whole main control panel is provided with 3 network ports, and one network port is connected with the observation control panel; the other two are connected with the nozzle driving plate. The main control panel is directly connected with the observation control panel and the nozzle drive plate, so that the whole printing system can be controlled conveniently.

Further, as shown in fig. 1 and fig. 3, the delay switching circuit includes: a first switching sub-circuit and a second switching sub-circuit; the first switching sub-circuit is connected with the first nozzle driving plate, and the second switching sub-circuit is connected with the second nozzle driving plate.

In this embodiment, the first switching sub-circuit structure is the same as the second switching sub-circuit structure, and the first switching sub-circuit and the second switching sub-circuit are mutually exclusive circuits, and when the first switching sub-circuit is connected to the power supply, the second switching sub-circuit is disconnected from the power supply, and vice versa. In the invention, two mutual exclusion circuits are arranged, the first switching sub-circuit has the function of starting the first nozzle driving plate in a delayed mode, the second switching sub-circuit has the function of starting the second nozzle driving plate in a corresponding delayed mode, and when the nozzle circuits need to be switched, one of the first switching sub-circuit and the second switching sub-circuit is selected to be conducted with a power supply. When the shower nozzle is switched on, the control circuits of the two shower nozzles are opened only when a time delay exists, and in this time, the time for returning the corresponding closed shower nozzle is given, and meanwhile, a certain response time is given to the shower nozzle to be started. When the sprayer system is switched, the condition that the closed sprayer is started to be started without returning is avoided, and meanwhile, the condition that the sprayer to be started is started when the sprayer is at the initial position is ensured. The technical problem that when the printing equipment in the prior art is switched to a system, the system is unstable is solved; the switching control system has the advantages of stably switching the spray head system, ensuring that the previous spray head for spraying liquid does not fly ink and the next spray head for spraying liquid stably runs.

It should be noted that the switching manner between the power source and the first switching sub-circuit or the second switching sub-circuit is not unique. The manner in which the delay of the jets is controlled is also not unique. The time delay of the spray head can be controlled by setting a time delay relay to delay the start of the spray head, and software can be set to control the timing start of the first switching sub-circuit or the second switching sub-circuit. Of course, the control of the delay may be to perform the delay according to time, or to start the next head according to the state of the head (for example, whether the previous head is returned, whether ink is accumulated at the head, or whether the next head is at the initial position).

Preferably, as shown in fig. 1 and 3, the circuit further includes: the selection switch Q1 and the selection switch Q1 are arranged among the first switching sub-circuit, the second switching sub-circuit and the power supply, and are used for connecting the power supply with the first switching sub-circuit or communicating the second switching sub-circuit.

In this embodiment, the selector switch Q1 is provided with a manual rotation bidirectional switch, and a control circuit to be turned on can be quickly selected by manually rotating a button. Specifically, in the apparatus, the manual rotation switch is provided outside the housing 9, and the button is manually rotated as required to switch the first switching sub-circuit and the second switching sub-circuit. Simple structure and convenient operation. In this embodiment, a manual knob mode may be selected, in other embodiment modes, a circuit switch may be selected, and a software switch may also be selected, and such switches are common switches in the art and are not described in detail herein.

Further, the first switching sub-circuit includes: the first time relay is used for controlling the first spray head 21 to start after first preset time; the second switching sub-circuit comprises: and a second time relay for controlling the second type of spray head 22 to start after a second preset time.

In this embodiment, select first time relay KT1 and second time relay KT2, first time relay KT1 makes when first switching sub-circuit switches on with the power, can delay the start-up switch-on circuit, also can delay and close first switching sub-circuit when first switching sub-circuit and power disconnection, consequently when opening and closing corresponding shower nozzle, can both delay the time and protect the shower nozzle.

In this embodiment, the placing frame 33 of the first intermediate relay KA4 is connected in parallel with the first time relay KT1, the first switching sub-circuit is also connected in parallel with a first indicator light for indicating the working state of the first nozzle 21, and the placing frame 33 of the first intermediate relay KA4 is connected in series with a first relay switch; a first intermediate relay KA4 is arranged on the frame 33, contact points are increased, and an electric appliance for controlling the spray head is added. In the second switching sub-circuit, the crossbeam 41 of the second intermediate relay KA5 is connected in parallel with the second time relay KT2, the second switching sub-circuit is also connected in parallel with a second indicating lamp for indicating the working state of the second type of spray head 2, and the crossbeam 41 of the second intermediate relay KA5 is connected in series with a second relay switch, so that the principle is consistent, and the details are not repeated herein.

The working principle of the embodiment is as follows: the main control board controls the first nozzle driving board to drive the first nozzle to spray liquid towards the printing medium, and simultaneously controls the second driving mechanism to drive the printing medium to move towards the second direction, so that a test pattern is formed on the surface of the printing medium; the first driving mechanism is controlled to drive the printing trolley to move towards the liquid observation mechanism to correspond to the liquid observation mechanism, and the main control board controls the first spray head driving board to spray liquid towards the liquid observation mechanism; the main control panel simultaneously controls the liquid observation control panel to drive the liquid observation mechanism to observe the liquid performance; the main control board controls the first driving mechanism to drive the printing trolley to return to the zero setting area, meanwhile, the main control board sets zero for the second type of spray head, after the zero setting is finished, the main control board controls the second type of spray head to move to the position above the printing medium, and a new round of liquid performance test is started.

Example two

The second aspect of the present invention provides a method for controlling a printing apparatus for testing liquid performance by time-delay switching between nozzles; in particular for controlling a printing apparatus as in any of the embodiments one. Specifically, with reference to fig. 1, the printing apparatus includes: at least two kinds of spray heads capable of spraying different amounts of liquid, wherein the at least two kinds of spray heads comprise: a first type head 21 and a second type head 22; a first head drive plate corresponding to the first type of head 21; a second head drive plate corresponding to the second type of head 22; a main control panel; referring to fig. 14, the control method includes: s1, after the main control board controls the first nozzle driving board to drive the first nozzle to spray liquid, the first nozzle driving board is controlled to send a feedback signal to the main control board; s2, when the main control board receives the feedback signal, the main control board controls the first nozzle drive board to be disconnected; and S3, the main control board sends a delay driving signal to the second nozzle driving board, and the second nozzle driving board is controlled to delay the preset time and then drives the second nozzle to spray liquid.

In this embodiment, in the first aspect of the method provided in this embodiment, two different nozzles are controlled, so that droplets in a wider volume range can be obtained, and two sets of nozzle drive plates are simultaneously provided, where the nozzle drive plates correspond to each of the nozzles one to one; each spray head is independently controlled, so that the spray range is widened, the spray is accurately controlled, and the printing precision is improved; the problems that the printing equipment in the prior art is small in liquid volume range and large in limitation in testing are solved. In the second aspect, a delay signal is arranged between two driving plates for driving the two nozzles, and the two nozzles are switched in a delayed manner through the delay signal. In the switching process of the delay switching circuit, when the delay switching circuit is disconnected with the first spray head in a driving mode, the delay switching circuit is powered off in a delayed mode; and when the main control board is connected with the second nozzle drive board, the second nozzle drive board is conducted in a delayed manner. Therefore, when two different types of nozzles are switched, because the time delay is provided before the nozzles are switched on, the various nozzles are stabilized within the time delay, and the unstable ink flying of the nozzles and the like when the first type of nozzles 21 jet liquid are avoided; in addition, the second ejection head 22 does not return to the initial position, resulting in that the ink ejection state of the second ejection head 22 is not in the optimal state, resulting in that the ejection effect is not ideal, thereby affecting the test performance of the liquid. Therefore, compared with the prior art, the invention has the advantages that two different types of spray heads are arranged, and meanwhile, the delay signal is sent to play a role in delay switching, so that the liquid performance in a larger range can be tested, the applicability of the printing device is improved, and meanwhile, the test effect of the liquid performance is ensured; when the ink is used for printing, better printing effect can be ensured. Therefore, the invention has the advantages of capability of simultaneously driving two or more than two nozzles, wide spraying volume range, high applicability, accurate liquid performance test and the like.

Further, before the main control board controls the second nozzle driving board to drive the second nozzle 22 to spray liquid, and after the main control board is disconnected from the first nozzle driving board, the method further includes: the main control board zeroes and resets the second head 22.

In this embodiment, after the current head ejects liquid, when it is necessary to control the next different head to eject liquid to test other liquid ejection points, the print carriage 2 is driven to return to zero for the next head. Because the initial zero points of different types of spray heads are different, zero is set before each type of spray head is required to be printed, and the spray of each type of spray head is ensured to be in the optimal state. Therefore, the invention can test the performance of the sprayed liquid in different width ranges, and spray test images with different sizes so as to improve the measurement precision; in addition, the first driving mechanism 4 is arranged, zero setting is carried out before each injection, and the accuracy of liquid performance testing is further guaranteed.

Further, the main control board zeroing and returning the second nozzle 22 includes: the main control board controls the spray head control board to pre-zero the second spray head in the first time; after the nozzle control board pre-zeroes the second type of nozzle 22; the main control board controls the second type nozzles 22 to perform final zeroing of the second type nozzles 22.

In this embodiment, a pre-zero step is set, and the nozzle is pre-zeroed in the process of controlling the return of the printing carriage 2. The speed of zeroing can be accelerated.

Further, the printing apparatus further includes: a liquid observation mechanism 5 and an observation control panel connected with the main control panel; before the main control board zeroes and resets the second sprayer 22, the method further comprises the following steps: the main control board controls the first nozzle driving board to drive the first type of nozzle 21 to spray liquid towards the liquid observing mechanism 5; meanwhile, the main control board controls the observation control board to drive the liquid observation mechanism 5 to observe the liquid sprayed by the first spray head 21.

In this embodiment, the method further includes: the main control board controls the first nozzle driving board to drive the first nozzle 21 to spray liquid towards the liquid observing mechanism 5 before or after; the main control board controls the first nozzle driving board to drive the first type of nozzles 21 to eject liquid towards the printing medium to form a test image; after the main control board controls the first nozzle driving board to drive the first nozzle 21 to spray liquid towards the liquid observing mechanism 5 and the printing medium, the first nozzle 21 is considered to finish spraying the liquid; the main control board zeroes and resets the second head 22. In this solution, the first type of head 21 is zeroed, the test image is printed or the head is ejected towards the liquid observation mechanism 5, and in both cases, the second type of head 22 is zeroed; therefore, in the process of testing the performance of the liquid, the first type of nozzle 21 may be zeroed, and after the liquid of the first type of nozzle 21 is printed, the second type of nozzle 22 may be zeroed. Therefore, the step of switching the nozzles can be omitted, thereby reducing the need for zeroing various nozzles and improving the quality of printing.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printing apparatus for testing liquid performance by switching between at least two kinds of ejection heads different in liquid ejection amount range to eject liquid at a predetermined timing, the printing apparatus comprising:

the number of the nozzle driving plates is consistent with the type of the nozzles, and each nozzle driving plate is used for correspondingly driving one nozzle to spray liquid;

a main control panel;

one end of the delay switching circuit is connected with the main control board, and the other end of the delay switching circuit is connected with one of the at least two nozzle drive boards; wherein the content of the first and second substances,

when the main control board controls a first sprayer drive plate in the at least two sprayer drive plates to drive a corresponding first sprayer in the at least two sprayers to spray liquid with a specified amount through the delay switching circuit, stopping spraying the liquid;

after the time delay switching circuit times to a preset time, the time delay switching circuit switches and is connected to a second spray head drive plate corresponding to a second spray head of at least two spray heads so as to establish connection between the main control board and the second spray head drive plate, and the main control board controls the second spray head drive plate to drive the second spray head to spray liquid through the time delay switching circuit.

2. The printing apparatus for testing liquid performance by time-lapse switching between heads according to claim 1, wherein the main control board resets zero and return to the second head after the time-lapse switching circuit is connected to the second head driving board and the main control board is disconnected from the first head driving board corresponding to the first head.

3. The printing apparatus for testing liquid performance by time-lapse switching between heads according to claim 2, further comprising: the observation control panel is connected with the main control panel and controls the liquid observation mechanism to observe liquid sprayed by various spray heads.

4. A printing apparatus for testing liquid properties according to any of claims 1-3, wherein said delay switching circuit comprises: a first switching sub-circuit and a second switching sub-circuit; the first switching sub-circuit is connected with the first spray head drive plate, and the second switching sub-circuit is connected with the second spray head drive plate.

5. The printing apparatus for testing liquid performance by time-lapse switching between heads according to claim 4, wherein the first switching sub-circuit comprises: the first time relay is used for controlling the first spray head to start after first preset time; the second switching sub-circuit comprises: and the second time relay is used for controlling the second spray head to start after second preset time.

6. The inter-nozzle time-lapse switching printing apparatus for testing liquid performance of claim 5, the first switching sub-circuit further comprising a first intermediate relay; the second switching sub-circuit comprises: and a second intermediate relay.

7. A control method of a printing device for testing liquid performance by time-delay switching between spray heads is characterized in that the printing device comprises the following steps: at least two kinds of spray heads capable of spraying different amounts of liquid, wherein the at least two kinds of spray heads comprise: a first type of spray head and a second type of spray head; a first nozzle driving plate corresponding to the first type of nozzle; a second nozzle driving plate corresponding to the second type of nozzle; a main control panel; the control method comprises the following steps:

after the main control board controls the first nozzle driving board to drive a first type of nozzle to spray liquid, the first nozzle driving board is controlled to send a feedback signal to the main control board;

after the main control board receives the feedback signal, the main control board controls the main control board to be disconnected with the first sprayer driving board;

and the main control board sends a delay driving signal to the second sprayer driving board to control the second sprayer driving board to delay for a preset time and then drive the second sprayer to spray liquid.

8. The method as claimed in claim 7, wherein before the main control board controls the second head driving board to drive the second head to eject the liquid, and after the main control board is disconnected from the first head driving board, the method further comprises: and the main control board is used for zeroing and resetting the second spray head.

9. The method of claim 8, wherein the main control board zeroing and resetting the second nozzle comprises: the main control board controls the sprayer driving board to pre-zero the second sprayer in a first time; after the sprayer driving board pre-zeroes the second type of sprayer; and the main control board controls the second type of spray head to carry out final zero setting on the second type of spray head.

10. The method of controlling a printing apparatus for testing liquid performance by time-lapse switching between heads according to claim 7, wherein the printing apparatus further comprises: the liquid observation mechanism and the observation control plate are connected with the main control plate; before the main control board zeroes and resets the second sprayer, the method further comprises the following steps: the main control board controls the first spray head driving board to drive a first spray head to spray liquid towards the liquid observation mechanism; and meanwhile, the main control board controls the observation control board to drive the liquid observation mechanism to observe the liquid sprayed by the first spray head.