WO2009117947A1 - 一种喷墨印刷机清洗压力控制的方法及装置 - Google Patents

一种喷墨印刷机清洗压力控制的方法及装置 Download PDF

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Publication number
WO2009117947A1
WO2009117947A1 PCT/CN2009/070983 CN2009070983W WO2009117947A1 WO 2009117947 A1 WO2009117947 A1 WO 2009117947A1 CN 2009070983 W CN2009070983 W CN 2009070983W WO 2009117947 A1 WO2009117947 A1 WO 2009117947A1
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WIPO (PCT)
Prior art keywords
port
ink cartridge
pressure
air pressure
solenoid valve
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PCT/CN2009/070983
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English (en)
French (fr)
Inventor
邢笑笑
郭涛
刘志红
陈�峰
Original Assignee
北大方正集团有限公司
北京大学
北京北大方正电子有限公司
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Application filed by 北大方正集团有限公司, 北京大学, 北京北大方正电子有限公司 filed Critical 北大方正集团有限公司
Publication of WO2009117947A1 publication Critical patent/WO2009117947A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head

Definitions

  • the present invention relates to the technical field of gas pressure control, and more particularly to a method and apparatus for cleaning pressure control of an ink jet printer. Background technique
  • a common cleaning method is to apply a positive pressure in the ink cartridge above the nozzle to squeeze the ink out of the nozzle of the nozzle, and at the same time bring dust or air bubbles out of the nozzle to achieve the purpose of cleaning the nozzle.
  • a typical ink jet printer has a plurality of ink cartridges. There are currently two options for cleaning such an ink jet printer having a plurality of ink cartridges.
  • the first solution The air pressures in the multiple ink cartridges are connected together, and all the ink cartridges can be positively pressed for overall cleaning, but it is not possible to apply a positive pressure to a single ink cartridge for cleaning.
  • the second option Install a two-position two-way solenoid valve above each cartridge to close the solenoid valve above the cartridge that does not need to be cleaned during cleaning.
  • This solution requires a two-way solenoid valve, an ink cartridge, and a gas path between the two to be well sealed. Otherwise, when the solenoid valve is closed, the negative pressure inside the ink cartridge will be lost, causing the ink to flow out of the ink cartridge itself, resulting in no The necessary loss.
  • the main object of embodiments of the present invention is to provide a method and apparatus for cleaning pressure control of an ink jet printer for reducing the complexity of cleaning pressure control of an ink jet printer when independently cleaning a nozzle of a single nozzle. .
  • Embodiments of the present invention provide an ink jet printer cleaning pressure control apparatus, including: at least one ink cartridge with a gas passage, at least two solenoid valves, a negative air pressure port, a positive air pressure circuit a port and an atmospheric port; the solenoid valve includes at least three ports;
  • each ink cartridge is connected to a first port of a solenoid valve
  • the second port of each of the solenoid valves is connected in parallel to the negative pressure port, and the third port of each of the solenoid valves is connected in parallel to the first end ⁇ of the solenoid valve connected to the positive air pressure;
  • the second port of the other solenoid valve connected to the positive air pressure is connected to the positive air pressure port, and the other third port of the solenoid valve connected to the positive air pressure is connected to the atmospheric port.
  • An embodiment of the present invention provides a method for cleaning pressure control of an inkjet printer, comprising: switching a gas path port connected to a gas path of an ink cartridge according to an operating state of two electromagnetic valves; and when a gas path of the ink cartridge is connected to a positive air pressure port, Positive pressure squeezes ink out of the ink cartridge to clean the nozzle of the ink jet printer.
  • Embodiments of the present invention provide a device for controlling airway of an inkjet printer, at least one ink cartridge with a gas passage, at least two electromagnetic valves, a negative air pressure port, a positive air pressure port, and an atmospheric port;
  • the gas passage is connected to the first port of a solenoid valve; the second port of each solenoid valve is connected in parallel to the negative pressure port, and the third port is connected in parallel to another solenoid valve connected to the positive air pressure
  • the first port on the upper; the second port of the other solenoid valve connected to the positive air pressure is connected to the positive air pressure port, and the third port is connected to the atmospheric port.
  • Figure 1 is a block diagram showing an apparatus for controlling the cleaning pressure of an ink jet printer having four ink cartridges according to an embodiment of the present invention
  • Fig. 2 is a flow chart showing the control of cleaning the nozzles of the corresponding nozzles of the single ink cartridge in the embodiment. detailed description
  • Embodiments of the present invention provide an apparatus for cleaning pressure control of an ink jet printer.
  • the ink jet printer having a plurality of ink cartridges and a head includes: at least one ink cartridge with a gas passage, at least two solenoid valves, and a negative air pressure passage Port, positive air pressure port, atmospheric port.
  • the gas path of each of the ink cartridges is connected to a first port of a solenoid valve.
  • the second ports of each of the solenoid valves are connected in parallel to the negative pressure port, and the third port of each of the solenoid valves is connected in parallel to the first port of the solenoid valve connected to the positive air pressure.
  • the second port of the other solenoid valve connected to the positive air pressure is connected to the positive air pressure port, and the other third port of the solenoid valve connected to the positive air pressure is connected to the atmospheric port.
  • Embodiments of the present invention include, when each of the solenoid valves is de-energized, a first port of each solenoid valve is in communication with a second port; and when each of the solenoid valves is energized, the first of each solenoid valve The ports are connected to the third port.
  • Embodiments of the present invention further include: when each of the solenoid valves is energized, a first port and a second port of each solenoid valve are in communication; when each of the solenoid valves is powered off, each of the solenoid valves One port is connected to the third port.
  • the first port and the second port of the electromagnetic valve connected to the positive air pressure are connected; when the other one is When the solenoid valve connected to the positive air pressure is energized, the first port and the third port of the solenoid valve connected to the positive air pressure are in communication.
  • the embodiment of the present invention further includes: when the another electromagnetic valve connected to the positive air pressure is energized, the first port and the second port of the electromagnetic valve connected to the positive air pressure are connected; when the other one is positive When the pneumatically connected solenoid valve is de-energized, another first port and a third port of the solenoid valve connected to the positive air pressure are in communication.
  • the device provided by the embodiment of the invention may further comprise a pressure detecting device, wherein the pressure detecting device is configured to detect the magnitude of the pressure in the airway.
  • a pressure detecting device configured to detect the magnitude of the pressure in the airway.
  • the method of the embodiment of the present invention further includes: when the electromagnetic valve connected to the airway port of the ink cartridge is energized, the airway port of the ink cartridge is connected to the negative air pressure port;
  • the ink cartridge air passage port communicates with the positive air pressure port.
  • the gas path port connected to the gas path of the ink cartridge according to the state of the other solenoid valve connected to the positive air pressure further includes:
  • the positive pressure squeezes the ink out of the ink cartridge to clean the nozzle of the nozzle;
  • the cleaning pressure is maintained at a constant value.
  • the cleaning time reaches the set value, the cleaning is completed and the cleaning is completed.
  • the pressure detecting device detects the magnitude of the pressure in the airway.
  • the airway of the ink cartridge is connected to the atmospheric port through a solenoid valve and another electromagnetic valve connected to the positive air pressure to release the positive pressure in the gas path of the ink cartridge;
  • the pressure detecting device detects that the positive pressure in the air passage of the ink cartridge is less than or equal to the lower limit value, the air passage port of the ink cartridge is directly connected to the negative air pressure port through the electromagnetic valve, and the nozzle is in the working state.
  • a solenoid valve is used as a two-position three-way solenoid valve
  • the pressure detecting device is a pressure sensor.
  • the device of this embodiment comprises ink cartridges 1, 2, 3, 4; two-position three-way solenoid valves 5, 6, 7 , 8, 9; pressure sensor 10; negative pressure gas path port 11; atmospheric port 12; positive pressure gas path Port 13.
  • the ink cartridges 1, 2, 3, 4 and the corresponding two-position three-way solenoid valves 5, 6, 7, 8 form four control branches; four control branches are connected in parallel with the two-position three-way solenoid valve 9, pressure sensor 10
  • the negative pressure airway port 11, the atmospheric port 12, and the positive pressure airway port 13 constitute a control main path.
  • the specific connections are as follows:
  • the air ports of the ink cartridges 1, 2, 3, and 4 are connected to a public port 501, 601, 701, and 801 of a two-position three-way solenoid valve 5, 6, 7, and 8.
  • the normally open ports 502, 602, 702, and 802 of the three-way solenoid valves 5, 6, 7, and 8 are connected to the negative pressure air port 11.
  • the normally closed ports 503, 603, 703, and 803 of the three-way solenoid valves 5, 6, 7, and 8 are connected to the common port 901 of the two-position three-way solenoid valve 9.
  • the normally open port 902 of the two three-way solenoid valve 9 is connected to the atmospheric port 12.
  • the normally closed port 903 of the two-position three-way solenoid valve 9 is connected to the positive pressure air port 13.
  • the common port 901 of the two-position three-way solenoid valve 9 is connected to a pressure sensor 10 for detecting the magnitude of the pressure.
  • FIG. 2 is a control flow chart of cleaning the nozzles of the nozzles corresponding to the single ink cartridges in the embodiment.
  • the specific working steps of the embodiment are as follows:
  • Step 201 when the cleaning starts, energizing the two-position three-way solenoid valve 9 on the control main road, so that The common port 901 of the two-position three-way solenoid valve 9 is in communication with the normally closed port 903.
  • Step 202 The two-position three-way solenoid valve 5 on the control branch is energized such that the common port 501 of the two-position three-way solenoid valve 5 communicates with the normally closed port 503.
  • the positive pressure enters the ink cartridge 1 from the positive pressure air passage port 13 via the two-position three-way solenoid valves 9, 5.
  • the air pressure in the ink cartridge 1 is a positive pressure, and the ink is squeezed out of the ink cartridge 1 to clean the nozzles of the connected nozzles.
  • the ink cartridges 2, 3, and 4 are still connected to the negative pressure gas path port 11 and are not affected by the positive pressure gas path.
  • Step 203 During the cleaning process, the pressure sensor 10 on the control main road always detects the pressure in the cleaning gas path. Once the pressure is greater than the upper limit value, the cleaning process is faulty. At this time, whether or not the time required for cleaning is reached, directly enter. Step 205, releasing the pressure in the ink cartridge 1 to protect the nozzle from being crushed by excessive pressure. If the pressure sensor 10 detects that the pressure in the purge circuit is normal and remains at a reasonable value, then step 204 is entered.
  • Step 204 preset a time, after the cleaning time reaches the set time, perform step 205; when the cleaning time has not reached the set time, continue to step 203, continue to determine the pressure in the cleaning gas path If it is normal, continue to clean the nozzle nozzle under normal pressure conditions until the set time is reached.
  • Step 205 During the cleaning process, the two-position three-way solenoid valve 9 on the control main road is first powered off, so that the common port 901 of the two-position three-way solenoid valve 9 is connected to the normally open port 902. The residual positive pressure in the ink cartridge 1 is discharged to the atmosphere through the two-position three-way solenoid valves 5, 9.
  • Step 206 the pressure sensor 10 on the main road is controlled to detect the pressure in the cleaning gas path.
  • the positive pressure is less than the lower limit value, when the positive pressure in the cleaning gas path is completely disappeared, the two-way three-way on the control branch is detected.
  • the solenoid valve 5 is de-energized.
  • Step 207 After the two-position three-way solenoid valve 5 on the control branch is powered off, the ink cartridge 1 is connected to the negative pressure air passage port 11 via the two-position three-way solenoid valve 5. Before the two-way three-way solenoid valve 5 is powered off, the inside of the ink cartridge 1 is at normal atmospheric pressure. When the two-way three-way solenoid valve 5 is powered off, the normal atmospheric pressure in the ink cartridge 1 has a certain influence on the negative pressure airway port 11 . But this effect is within the acceptable range of the system.
  • the two-way three-way electromagnetic on the main road is first controlled.
  • the valve 9 is energized, and then the two-way three-way solenoid valves 5, 6, 7 corresponding to the control branch are energized to the nozzles to be cleaned, and the positive pressure enters the ink cartridge 1 from the positive pressure air passage port 13 via the two-position three-way solenoid valves 9, 5. Entering the ink cartridge 2 through the two-position three-way solenoid valves 9, 6; entering the ink cartridge 3 via the two-position three-way solenoid valves 9, 7.
  • the air pressure in the ink cartridges 1, 2, and 3 is a positive pressure, and the ink is squeezed out from the ink cartridges 1, 2, and 3, and the nozzles of the nozzles connected to the ink cartridges 1, 2, and 3 are cleaned.
  • the ink cartridge 4 is still connected to the negative pressure gas path port 11 and is not affected by the positive pressure gas path.
  • the cleaning pressure is maintained at a constant value.
  • the cleaning time reaches the set value, the cleaning ends and the cleaning end is entered.
  • the pressure in the cleaning gas path detected by the pressure sensor 10 on the main road is greater than the upper limit, the cleaning process is broken and directly enters the cleaning end stage.
  • the two-way three-way solenoid valve 9 on the control main road is closed, and the residual positive pressure in the ink cartridge 1 is discharged to the atmosphere through the two-way three-way solenoid valves 5, 9; the residual positive pressure in the ink cartridge 2
  • the two three-way solenoid valves 6, 9 are discharged into the atmosphere; the residual positive pressure in the ink cartridge 3 is discharged to the atmosphere through the two-way three-way solenoid valves 7, 9.
  • the pressure sensor 10 detects that the positive pressure is less than the lower limit value, it is considered that when the positive pressure in the cleaning gas path completely disappears, the corresponding two-position three-way solenoid valves 5, 6, 7 are powered off, so that the ink cartridges 1, 2, 3 pass The two-position three-way solenoid valves 5, 6, 7 are connected to the negative air pressure port 11.
  • the apparatus for cleaning pressure control of the ink jet printer provided in this embodiment can independently clean the nozzles of the nozzles corresponding to the single ink cartridges, and can also collectively clean the nozzles of the nozzles corresponding to the plurality of ink cartridges.
  • the device only needs to control the two two-position three-way solenoid valves in this embodiment, which greatly reduces the complexity of the control. Since the ink cartridge corresponding to the nozzle that does not need to be cleaned is still connected to the negative pressure air passage port during the cleaning process, the ink does not flow out of the ink cartridge and causes a loss, thereby improving the reliability of the device. Since the pressure sensor always detects the positive air pressure value in the cleaning air circuit, and the two-way three-way solenoid valve on the main road is controlled to be connected to the atmospheric port in the power-off state, the safety of the device is also effectively guaranteed.
  • the solenoid valve uses a two-position three-way solenoid valve, but is not limited to this type of solenoid valve, and other types of multi-position multi-way solenoid valves, such as two-position four-way solenoid valves, two-position five-way electromagnetic Valves, three-position five-way solenoid valves and the like can also be used in the embodiments of the present invention.
  • the above embodiment describes a method of controlling the cleaning pressure of an ink jet printer having four ink cartridges, which is equally applicable to the control of the cleaning pressure of an ink jet printer containing any plurality of ink cartridges.
  • an embodiment of the present invention provides a device for controlling airway of an inkjet printer, comprising a plurality of ink cartridges, a plurality of solenoid valves, a negative air pressure port, a positive air pressure port, and an atmospheric port;
  • the intersection is connected to the first port of a solenoid valve;
  • the second port of each solenoid valve is connected in parallel to the negative pressure port, and the third port is connected in parallel to another solenoid valve connected to the positive pressure
  • the first port of the electromagnetic valve connected to the positive air pressure is connected to the positive air pressure port, and the third port is connected to the atmospheric port.

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Description

UP-090395-02 一种喷墨印刷机清洗压力控制的方法及装置 技术领域
本发明涉及气体压力控制的技术领域， 尤指一种适用喷墨印刷机清洗压 力控制的方法及装置。 背景技术
在喷墨印刷机中， 为了防止喷头的喷嘴被灰尘或气泡堵塞， 需要对喷头 进行清洗。 常用的清洗方法是在喷头上方的墨盒内施加正压， 将墨水从喷头 的喷嘴内挤压出去， 同时将灰尘或气泡带出喷嘴， 达到清洗喷嘴的目的。 一 般喷墨印刷机有多个墨盒。 目前常用的有两种方案可以清洗这种有多个墨盒 的喷墨印刷机。 第一种方案： 多个墨盒内的气压连通在一起， 可以对所有的 墨盒施加正压进行整体清洗,但是无法单独对某一个墨盒施加正压进行清洗。 第二种方案： 在每个墨盒上方安装了一个两位两通电磁阀， 在清洗时关闭不 需要清洗的墨盒上方的电磁阀。 这种方案要求两位两通电磁阀、 墨盒及两者 之间的气路密封性很好， 否则当电磁阀关闭时， 墨盒内的负压会流失， 导致 墨水自行从墨盒内流出， 造成不必要的损失。 在实际使用中经常只需对一个 特定的墨盒对应喷头的喷嘴进行清洗， 这种情况下， 该方案需要控制的电磁 阀 4艮多， 增加了控制的复杂性， 降低了系统的可靠性。 发明内容
有鉴于此， 本发明实施例的主要目的是提供了喷墨印刷机清洗压力控制 的方法及装置， 用以在对单个喷头的喷嘴进行独立清洗时降低对喷墨印刷机 清洗压力控制的复杂性。
本发明实施例提供了一种喷墨印刷机清洗压力控制的装置， 包括： 至少一个带气路口的墨盒， 至少两个电磁阀， 负气压路端口， 正气压路 端口和大气端口； 所述电磁阀包括至少三个端口；
所述每个墨盒的气路口连接一个电磁阀的第一个端口；
所述每个电磁阀的第二个端口并联后连接到负气压路端口， 所述每个电 磁阀的第三个端口并联后连接另外一个与正气压连接的电磁阀的第一个端 σ；
所述另外一个与正气压连接的电磁阀的第二个端口连接到正气压路端 口， 所述另外一个与正气压连接的电磁阀的第三个端口连接到大气端口。
本发明实施例提供一种喷墨印刷机清洗压力控制的方法， 包括： 根据两个电磁阀的工作状态切换墨盒的气路口连接的气路端口； 当所述墨盒的气路口连接正气压端口， 正压将墨水从所述墨盒内挤压出 去， 清洗所述喷墨印刷机的喷嘴。
本发明实施例提供一种喷墨印刷机气路控制的装置， 至少一个带气路口 的墨盒， 至少两个电磁阀， 负气压路端口， 正气压路端口， 大气端口； 所述 每个墨盒的气路口连接一个电磁阀的第一个端口； 所述每个电磁阀的第二个 端口并联后连接到负气压路端口上， 第三个端口并联后连接到另外一个与正 气压连接的电磁阀上的第一个端口； 所述另外一个与正气压连接的电磁阀的 第二个端口连接到正气压路端口， 第三个端口连接到大气端口。 这样只需要 根据两个电磁阀的工作状态切换墨盒的气路口连接的气路端口， 在对单个喷 头的喷嘴进行独立清洗时， 只需控制两个电磁阀， 降低对喷墨印刷机清洗压 力控制的复杂性。 附图说明
图 1是本发明实施例有 4个墨盒的喷墨印刷机清洗压力控制的装置的结 构图；
图 2是本实施例清洗单个墨盒对应喷头的喷嘴的控制流程图。 具体实施方式
本发明实施例提供了一种喷墨印刷机清洗压力控制的装置， 对具有若干 个墨盒和喷头的喷墨印刷机， 包括： 至少一个带气路口的墨盒， 至少两个电 磁阀， 负气压路端口， 正气压路端口， 大气端口。
所述每个墨盒的气路口连接一个电磁阀的第一个端口。
所述每个电磁阀的第二个端口并联后连接到负气压路端口上， 所述每个 电磁阀的第三个端口并联后连接另外一个与正气压连接的电磁阀的第一个端 口。
所述另外一个与正气压连接的电磁阀的第二个端口连接到正气压路端 口， 所述另外一个与正气压连接的电磁阀的第三个端口连接到大气端口。
本发明实施例包括， 当所述每个电磁阀断电时， 每个电磁阀的第一个端 口和第二个端口连通； 当所述每个电磁阀通电时， 每个电磁阀的第一个端口 和第三个端口连通。
本发明实施例还包括， 当所述每个电磁阀通电时， 每个电磁阀的第一个 端口和第二个端口连通； 当所述每个电磁阀断电时， 每个电磁阀的第一个端 口和第三个端口连通。
而本发明实施例中， 当所述另外一个与正气压连接的电磁阀断电时， 另 外一个与正气压连接的电磁阀的第一个端口和第二个端口连通； 当所述另外 一个与正气压连接的电磁阀通电时， 另外一个与正气压连接的电磁阀的第一 个端口和第三个端口连通。
本发明实施例还包括， 当所述另外一个与正气压连接的电磁阀通电时， 另外一个与正气压连接的电磁阀的第一个端口和第二个端口连通； 当所述另 外一个与正气压连接的电磁阀断电时， 另外一个与正气压连接的电磁阀的第 一个端口和第三个端口连通。
本发明实施例提供的装置还可以包括压力检测装置， 所述压力检测装置 用于检测气路内压力的大小。 根据上述装置， 本发明实施例提供了一种喷墨印刷机清洗压力控制的方 法， 该方法可以根据两个电磁阀的工作状态切换墨盒的气路口连接的气路端 口， 具体实现过程可以是这样的：
所述墨盒气路口连接的电磁阀断电时， 墨盒的气路口与负气压路端口连 通；
所述墨盒气路口连接的电磁阀通电时， 墨盒的气路口与另外一个与正气 压连接的电磁阀连通。
本发明实施例所述方法还包括， 所述墨盒气路口连接的电磁阀通电时， 墨盒的气路口与负气压路端口连通；
所述墨盒气路口连接的电磁阀断电时， 墨盒的气路口与另外一个与正气 压连接的电磁阀连通。
而当墨盒的气路口与另外一个与正气压连接的电磁阀连通时， 则根据所 述另外一个与正气压连接的电磁阀的状态切换墨盒的气路口所连接的气路端 口具体如下：
所述另外一个与正气压连接的电磁阀断电时， 所述墨盒气路口与大气端 口连通；
所述另外一个与正气压连接的电磁阀通电时， 所述墨盒气路口与正气压 端口连通。
根据所述另外一个与正气压连接的电磁阀的状态切换墨盒的气路口所 连接的气路端口还包括：
所述另外一个与正气压连接的电磁阀通电时， 所述墨盒气路口与大气端 口连通；
所述另外一个与正气压连接的电磁阀断电时， 所述墨盒气路口与正气压 端口连通。
当墨盒的气路口通过一个电磁阀和另外一个与正气压连接的电磁阀连 接到正压气路端口， 正压将墨水从所述墨盒内挤压出去， 清洗喷头的喷嘴； 清洗过程中， 清洗压力保持一个定值， 当清洗时间达到设定值后， 清洗 结束，进入清洗结束阶段。本实施例中压力检测装置检测气路内压力的大小， 当压力检测装置检测到墨盒的气路内的正压大于等于设定的上限值时， 此时 清洗过程出现故障， 可直接进入清洗结束阶段。
清洗结束阶段， 墨盒的气路口通过电磁阀和另外一个与正气压连接的电 磁阀连接到大气端口， 释放所述墨盒气路内的正压；
当压力检测装置检测到墨盒的气路内的正压小于等于下限值时， 墨盒的 气路口通过电磁阀直接连接到负气压路端口， 喷头处于工作状态。
下面结合附图对本发明实施例所述装置进行详细描述。
参见图 1 , 为本发明实施例有 4个墨盒喷墨印刷机清洗压力控制的装置 的结构图， 本实施例中电磁阀使用的是两位三通电磁阀， 压力检测装置为压 力传感器。 本实施例所述装置包括墨盒 1 , 2, 3 , 4; 两位三通电磁阀 5 , 6, 7 , 8, 9; 压力传感器 10; 负压气路端口 11 ; 大气端口 12; 正压气路端口 13。 其中墨盒 1、 2、 3、 4与对应的两位三通电磁阀 5、 6、 7、 8组成了四条控制 支路； 四条控制支路并联后与两位三通电磁阀 9, 压力传感器 10、 负压气路 端口 11、 大气端口 12、 正压气路端口 13组成了控制主路。 具体连接如下： 墨盒 1、 2、 3、 4的气路口各连接一个两位三通电磁阀 5、 6、 7、 8的公 共端口 501、 601、 701、 801。 两位三通电磁阀 5、 6、 7、 8的常开端口 502、 602、 702、 802连接负压气路端口 11。 两位三通电磁阀 5、 6、 7、 8的常闭端 口 503、 603、 703、 803连接两位三通电磁阀 9的公共端口 901。 两位三通电 磁阀 9的常开端口 902连接大气端口 12。 两位三通电磁阀 9的常闭端口 903 连接正压气路端口 13。 两位三通电磁阀 9的公共端口 901连接一个压力传感 器 10用于检测压力大小。
图 2为本实施例清洗单个墨盒对应的喷头的喷嘴的控制流程图， 以需要 清洗墨盒 1对应的喷头为例， 本实施例的具体工作步骤如下：
步骤 201 , 清洗开始时， 对控制主路上的两位三通电磁阀 9通电， 使得 两位三通电磁阀 9的公共端口 901与常闭端口 903连通。
步骤 202 , 对控制支路上的两位三通电磁阀 5通电， 使得两位三通电磁 阀 5的公共端口 501与常闭端口 503连通。正压从正压气路端口 13经两位三 通电磁阀 9、 5进入墨盒 1中。 清洗过程中， 墨盒 1内气压为正压， 墨水从墨 盒 1中被挤压出去， 清洗相连的喷头的喷嘴。 墨盒 2、 3、 4仍然与负压气路 端口 11相连， 不会被正压气路影响。
步骤 203 , 清洗过程中，控制主路上的压力传感器 10始终检测清洗气路 内的压力大小， 一旦压力大于上限值， 则清洗过程出现故障， 此时无论是否 达到清洗所需要的时间， 直接进入步骤 205 , 释放墨盒 1 中的压力， 保护喷 头不会被过大的压力压坏。 如果压力传感器 10检测清洗气路内的压力正常， 保持在一个合理的值上， 则进入步骤 204。
步骤 204, 预先设定一个时间， 当清洗时间达到所设定的时间后， 执行 步骤 205; 当清洗时间还未达到所设定的时间， 则继续执行步骤 203 , 继续判 断清洗气路内的压力是否正常， 继续在压力正常的条件下清洗喷头喷嘴， 直 至达到设定的时间。
步骤 205 , 清洗结束过程中， 首先对控制主路上的两位三通电磁阀 9断 电， 使得两位三通电磁阀 9的公共端口 901与常开端口 902连接。 墨盒 1内 残余的正压经过两位三通电磁阀 5、 9排放到大气中去。
步骤 206,控制主路上的压力传感器 10检测清洗气路内的压力， 当检测 到正压小于下限值时， 认为清洗气路内的正压完全消失时， 对控制支路上的 两位三通电磁阀 5断电。
步骤 207 , 控制支路上的两位三通电磁阀 5断电后， 使得墨盒 1经过两 位三通电磁阀 5连接负压气路端口 11。 在两位三通电磁阀 5断电前， 墨盒 1 内为正常大气压， 当在两位三通电磁阀 5断电后， 墨盒 1内的正常大气压对 负压气路端口 11有一定的影响， 但是这个影响在系统可以接受的范围内。
本实施例中对 1、 2、 3集体清洗时， 首先给控制主路上的两位三通电磁 阀 9通电， 然后给所需清洗的喷头对应控制支路上的两位三通电磁阀 5、 6、 7通电， 正压从正压气路端口 13经两位三通电磁阀 9、 5进入墨盒 1 ; 经两位 三通电磁阀 9、 6进入墨盒 2; 经两位三通电磁阀 9、 7进入墨盒 3中。 清洗 过程中， 墨盒 1、 2、 3内气压为正压， 墨水从墨盒 1、 2、 3中被挤压出去， 清洗与墨盒 1、 2、 3相连的喷头的喷嘴。墨盒 4仍然与负压气路端口 11相连， 不会被正压气路影响。 此时清洗压力保持一个定值， 当清洗时间达到设定值 后， 清洗结束， 进入清洗结束阶段。 同样当控制主路上的压力传感器 10检测 到的清洗气路内的压力大于上限制时， 则清洗过程出现故障， 直接进入清洗 结束阶段。 进入清洗结束阶段后， 首先关闭控制主路上的两位三通电磁阀 9, 墨盒 1内残余的正压经过两位三通电磁阀 5、 9排放到大气中去； 墨盒 2内残 余的正压经过两位三通电磁阀 6、 9排放到大气中去； 墨盒 3内残余的正压经 过两位三通电磁阀 7、 9排放到大气中去。 当压力传感器 10检测到正压小于 下限值时，认为清洗气路内的正压完全消失时，对应的两位三通电磁阀 5、 6、 7断电， 使得墨盒 1、 2、 3经过两位三通电磁阀 5、 6、 7连接到负气压路端 口 11。
本实施例提供的喷墨印刷机清洗压力控制的装置可以对单个墨盒对应 的喷头的喷嘴进行独立清洗， 同时也可以对多个墨盒对应的喷头的喷嘴进行 集体清洗。 在对单个喷嘴进行清洗的过程中， 该装置只需要对本实施例中的 两个两位三通电磁阀进行控制， 大大降低了控制的复杂性。 由于在清洗过程 中， 不需要清洗的喷嘴对应的墨盒仍然连接负压气路端口， 不会导致墨水自 行从墨盒内流出， 造成损失， 因此提高了装置的可靠性。 由于压力传感器始 终检测清洗气路内的正气压值， 并且控制主路上的两位三通电磁阀在断电状 态下常开端口连接大气端口， 装置的安全性也得到了有效的保证。
本发明实施例中电磁阀使用的是两位三通电磁阀， 但不仅仅限于此类型 的电磁阀， 其他类型的多位多通电磁阀， 例如两位四通电磁阀、 两位五通电 磁阀、 三位五通电磁阀等也可以用于本发明实施例中。 上述实施例描述了有 4个墨盒的喷墨印刷机清洗压力的控制方法， 该方 法同样适用于包含任意多个墨盒的喷墨印刷机清洗压力的控制。
综上所述， 本发明实施例提供一种喷墨印刷机气路控制的装置， 包括若 干墨盒， 若干电磁阀， 负气压路端口， 正气压路端口， 大气端口； 所述每个 墨盒的气路口连接一个电磁阀的第一个端口； 所述每个电磁阀的第二个端口 并联后连接到负气压路端口上， 第三个端口并联后连接到另外一个与正气压 连接的电磁阀上的第一端口； 所述另外一个与正气压连接的电磁阀的第二个 端口连接到正气压路端口， 第三个端口连接到大气端口。 这样只需要根据两 个电磁阀的工作状态切换墨盒的气路口连接的气路端口， 在对单个喷头的喷 嘴进行独立清洗时， 只需控制两个电磁阀， 降低对喷墨印刷机清洗压力控制 的复杂性。 由于在清洗过程中， 不需要清洗的喷嘴对应的墨盒仍然连接负压 气路端口， 不会导致墨水自行从墨盒内流出， 造成损失， 因此提高了装置的 可靠性。 由于压力传感器始终检测清洗气路内的正气压值， 装置的安全性也 得到了有效的保证。
虽然通过实施例描绘了本发明， 但本领域普通技术人员知道， 在不脱离 本发明的精神和实质的情况下， 就可使本发明有许多变形和变化， 本发明的 范围由所附的权利要求来限定。

Claims

UP-090395-02 利 要 求 书
1、 一种喷墨印刷机清洗压力控制的装置， 包括至少一个带有气路口的 墨盒， 其特征在于， 还包括： 至少两个电磁阀， 负气压路端口， 正气压路端 口和大气端口； 所述电磁阀包括至少三个端口；
所述每个墨盒的气路口连接一个电磁阀的第一个端口；
所述每个电磁阀的第二个端口并联后连接到负气压路端口， 所述每个电 磁阀的第三个端口并联后连接另外一个与正气压连接的电磁阀的第一个端 口；
所述另外一个与正气压连接的电磁阀的第二个端口连接到正气压路端 口， 所述另外一个与正气压连接的电磁阀的第三个端口连接到大气端口。
2、 如权利要求 1所述的装置， 其特征在于， 所述每个电磁阀断电 /通电 时， 所述每个电磁阀的第一个端口和第二个端口连通；
所述每个电磁阀通电 /断电时，所述每个电磁阀的第一个端口和第三个端 口连通。
3、如权利要求 1所述的装置， 其特征在于， 所述另外一个与正气压连接 的电磁阀断电 /通电时，所述另外一个与正气压连接的电磁阀的第一个端口和 第二个端口连通；
所述另外一个与正气压连接的电磁阀通电 /断电时，所述另外一个与正气 压连接的电磁阀的第一个端口和第三个端口连通。
4、 如权利要求 1所述的装置， 其特征在于， 该装置还包括： 压力检测装 置， 所述压力检测装置用于检测气路内压力的大小， 与所述另外一个与正气 压连接的电磁阀的第一端口连接。
5、 一种喷墨印刷机清洗压力控制的方法， 其特征在于， 包括： 根据两个电磁阀的工作状态切换墨盒的气路口连接的气路端口； 当所述墨盒的气路口连接正气压端口时， 正压将墨水从所述墨盒内挤压 出去， 清洗所述喷墨印刷机的喷嘴。
6、如权利要求 5所述的方法， 其特征在于， 所述根据两个电磁阀的工作 状态切换墨盒的气路口连接的气路端口包括：
所述墨盒气路口连接的电磁阀断电 /通电时，墨盒的气路口与负气压路端 口连通；
所述墨盒气路口连接的电磁阀通电 /断电时，墨盒的气路口与另外一个与 正气压连接的电磁阀连通。
7、如权利要求 6所述的方法， 其特征在于， 所述墨盒的气路口与另外一 个与正气压连接的电磁阀连通包括：
所述另外一个与正气压连接的电磁阀断电 /通电时，所述墨盒气路口与大 气端口连通；
所述另外一个与正气压连接的电磁阀通电 /断电时，所述墨盒气路口与正 气压端口连通。
8、 如权利要求 5所述的方法， 其特征在于， 该方法还包括：
当所述墨盒的气路口连接大气端口时， 释放所述墨盒气路内的正压。
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