[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention, the technical solution in the embodiments of the present invention will be described clearly and completely, it is clear that the embodiments described are only a part of the embodiment of the present invention, not all embodiments. Based on embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, are within the scope of protection of the present invention.
[0022] In order to enable those skilled in the art to better understand the present invention, the present invention will be further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Please refer to Figure 1 ， Figure 1 Schematic diagram of a double negative pressure ink circulation printer provided for an embodiment of the present invention.
[0024] The present invention provides a double negative pressure ink circulation printer comprising a first-class ink barrel 1, a secondary ink cartridge 4 and a circulating ink cartridge 8, a first-class ink barrel 1 as an ink source, insufficient ink, the need to fill ink into the first-level ink barrel 1 to ensure the ink cycle of the printer, the ink in the first-level ink barrel 1 is transported to the second-level ink cartridge 4 through the first ink transfer mechanism 3, the second-stage ink cartridge 4 is set above the nozzle 7, and the ink is transported to the nozzle 7 under gravity for printing, The ink flowing through the nozzle 7 is conveyed to the circulating cartridge 8 under the action of the second negative pressure mechanism, and then transported by the second inking mechanism 9 to the first stage ink drum 1.
[0025]Secondary ink cartridge 4 is set up with the first negative pressure mechanism, with the help of the first negative pressure mechanism to balance the gravity of the ink, adjust the speed of ink flowing out from the nozzle 7; Circulating ink cartridge 8 is used to recover the ink flowing through the nozzle 7, with the help of the differential pressure generated by the second negative pressure mechanism, the ink flowing through the nozzle 7 is steadily withdrawn back to the circulating cartridge 8, reducing the disturbance of the work of the nozzle 7. The ink in the circulating cartridge 8 is transported to the first stage ink barrel 1 by the second inking mechanism 9, and the setting of the circulating cartridge 8 alleviates the disturbance of the second inking mechanism 9 to the nozzle 7. Even if the environmental problems change, you can adjust the vacuum degree of the first negative pressure mechanism and the second negative pressure mechanism to meet the ink cycle requirements, and through the negative pressure to drive the ink cycle, to avoid the generation of waste ink and bubbles, the first negative pressure mechanism and the second negative pressure mechanism can timely discharge the air bubbles in the secondary ink cartridge 4 and the circulating ink cartridge 8, reduce the bubbles in the circulating ink, and avoid the printer needle break.
[0026] In a specific embodiment provided in the present invention, the first negative pressure mechanism comprises a first negative pressure source 41 communicated with the secondary ink cartridge 4 through the pipeline, the first negative pressure source 41 may specifically employ a vacuum pump. Pipeline is provided with a first regulator 42 and a first negative pressure gauge 43, when the ambient temperature changes caused by changes in ink density, by adjusting the vacuum degree of the first negative pressure source 41 and the opening of the first regulator 42 to regulate the speed of ink flow to the nozzle 7, the first negative pressure gauge 43 settings can observe the vacuum degree of the secondary ink cartridge 4 in real time, the first regulator 42 uses a precision regulator valve, which can be regulated within the range of ±0.1KPa.
[0027] Correspondingly, the second negative pressure mechanism comprises a second negative pressure source 81 communicated with the circulating cartridge 8 through the pipeline, the second negative pressure source 81 using a vacuum pump or other vacuum equipment, the second negative pressure source 81 and the pipe of the circulating cartridge 8 are provided with a second regulator valve 82, while providing a second negative pressure gauge 83. By changing the vacuum degree of the second negative pressure source 81 and the opening degree of the second regulator 82 to adjust the vacuum degree of the circulating cartridge 8, change the pressure difference between the circulating cartridge 8 and the nozzle 7, to achieve a smooth suction of the ink after printing, the nozzle 7 will be disturbed, to avoid the generation of bubbles.
[0028] In the above embodiment, the first ink transmission mechanism 3 and the second ink transmission mechanism 9 are using an ink supply pump, the first ink transmission mechanism 3 will be the ink in the first stage ink barrel 1 to the secondary ink cartridge 4, the first negative pressure mechanism is not only able to adjust the speed of ink flow to the nozzle 7, but also conducive to the air bubble escape delivered to the secondary ink cartridge 4, reducing the bubble content in the circulating ink. Since the installation position of the secondary ink cartridge 4 in the printer is higher than that of the first stage ink barrel 1, in order to avoid the first ink transmission mechanism 3 does not run the ink in the secondary ink cartridge 4 backflow to the first stage ink bucket 1, there is also a check valve 2 between the first stage ink drum 1 and the secondary ink cartridge 4, the check valve 2 only allows the ink in the first stage ink drum 1 to flow in one direction to the secondary ink cartridge 4. The check valve 2 may be specifically disposed between the first inking mechanism 3 and the first stage ink barrel 1.
[0029] Preferably, in order to ensure the normal ink supply of the nozzle 7 during the ink cycle, the secondary ink cartridge 4 is also equipped with a first liquid level sensor 44, the first liquid level sensor 44 is used to detect the liquid level in the secondary ink cartridge 4 in real time, and the liquid level signal is transmitted to the control mechanism of the first ink transmission mechanism 3, and the control mechanism controls the operation of the first ink delivery mechanism 3 according to the liquid level of the secondary ink cartridge 4, maintaining the liquid level of the secondary ink cartridge 4 within a preset range, ensuring the normal ink supply and relatively stable ink supply speed of the nozzle 7. Specifically, when the first level sensor 44 detects that the liquid level of the secondary ink cartridge 4 is lower than the minimum value of the preset range, the first ink transfer mechanism 3 will be controlled to start running, and the ink in the primary ink drum 1 will be transported to the secondary ink cartridge 4; As the liquid level within the secondary ink cartridge 4 rises and reaches the highest value of the preset range, the first level sensor 44 controls the second ink delivery mechanism 9 to stop running, until the liquid level of the secondary ink cartridge 4 drops again.
[0030] Circulating ink cartridge 8 is provided with a second level sensor 84, the second level sensor 84 is used to control the second ink transfer mechanism 9 to maintain the liquid level in the circulating cartridge 8 is within a preset range, to ensure the smooth suction of ink from the circulating cartridge 8 to the nozzle 7. Specifically, when the liquid level in the circulating ink cartridge 8 exceeds the highest value of the preset range, the second ink transfer mechanism 9 starts to run, the ink in the circulating cartridge 8 is transported to the first stage ink drum 1, the liquid level in the circulating ink cartridge 8 drops to the lowest value below the preset range, and the second ink transfer mechanism 9 stops running.
[0031] As the second negative pressure mechanism sucks the ink from the 7 nozzles, the liquid level in the circulating cartridge 8 rises again, and so on. Circulating cartridge 8 and primary ink drum 1 is provided with a solenoid valve 10, the solenoid valve 10 is opened only when the second ink transfer mechanism 9 is running; In the second ink transfer mechanism 9 stop operation, the solenoid valve 10 closed, is conducive to maintaining the vacuum level in the circulating cartridge 8, to maintain a smooth suction of ink at the nozzle 7, and then reduce the energy consumption of the second negative pressure mechanism.
[0032] In the ink cycle process, the inevitable generation of waste ink and bubbles, to ensure the normal operation of the nozzle 7, the present invention provides a double negative pressure ink circulation printer further comprises a filter device 5 and a degassing device 6. The first inking mechanism 3 and the secondary ink cartridge 4 is provided with a filter device 5 to ensure the purity of the ink entering the secondary ink cartridge 4; The filter device 5 and the degassing device 6 are provided between the secondary ink cartridge 4 and the nozzle 7 to avoid waste ink clogging the nozzle 7, while reducing the needle breaking phenomenon at the nozzle 7. The setting of the filter device 5 and the degassing device 6 may refer to prior art.
[0033]Further, the first-level ink barrel 1 as an ink source, with the increase in the number of cycles and the consumption of ink, while the secondary ink cartridge 4 and the circulating ink cartridge 8 maintain the normal liquid level, the liquid level in the first-level ink barrel 1 will inevitably decline, the liquid level will drop below the warning line If the ink is not replenished in time, the normal operation of the printer will be affected. The present application also provides a level alarm mechanism within the first-class ink drum 1, the level alarm mechanism comprises a third level detector and an alarm module connected to the third level sensor. Detect the level of the first-level ink bucket 1 through the third level sensor, the liquid level is sent to the alarm module when the liquid level is lower than the alert level, and the alarm module prompts the ink, and the alarm module can be the touch operation panel of the printer, or the warning light set on the side of the printer.
[0034] It should be noted that, in the present specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply that there is any such actual relationship or order between these entities.
[0035] The above is a detailed description of the double negative pressure ink cycle printer provided by the present invention. The principles and embodiments of the present invention are elaborated herein, and the description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be noted that, for those of ordinary skill in the art, without departing from the principles of the present invention, the present invention may also be several improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
