CN109397881A - 用于恢复有故障喷头的方法和系统 - Google Patents
用于恢复有故障喷头的方法和系统 Download PDFInfo
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Abstract
一种用于恢复打印头中的未命中喷头的方法包含:确定所述打印头中的喷头不喷出油墨;将已除气油墨清除到所述打印头中;调整所述打印头中的压力,使得油墨流出所述打印头的每一喷嘴的孔隙;在所述油墨流出所述打印头的每一喷嘴的所述孔隙的同时,在预定时间量内以一定频率向所述打印头反复地施加非激发波形;以及在所述预定时间量之后,将所述打印头中的所述压力调整成正常打印头压力。
Description
技术领域
本公开涉及恢复喷头打印头的有故障喷头,且更确切地说,涉及恢复未通过清除恢复的喷头打印头的有故障喷头。
背景技术
出于多种原因,喷头打印头可能会发生故障。举例来说,气泡最终出现在喷头打印头中,或水可以从水性油墨蒸发并产生粘滞栓柱,从而引起喷头打印头的喷嘴发生故障。很多时候,气泡或粘滞栓柱的部位使得其可以通过正常清除操作清除出打印头。然而,有时气泡或粘滞栓柱最终出现在清除低效的部位中。
不可清除的气泡和粘滞栓柱通常不会在打印头的正常操作期间出现。相反,这些通常归因于可靠性故障事件而出现,例如用折弯的油墨进料管打印、供应阀被关闭,或允许未使用的打印头中的油墨在长时间段内变干。不可清除的气泡和/或粘滞栓柱可以造成强度变化、液滴位置变化,或仅仅防止喷头喷出墨滴。
传统的解决方案已包含隐藏受气泡或粘滞栓柱影响的未命中喷头。当将新鲜的已除气油墨用于打印头中时,气泡最终溶解和/或水将扩散到油墨的粘滞栓柱中,且未命中喷头将再次作业。然而,这种解决方案仅仅在少数喷头受影响的情况下起作用。如果过多的喷头受影响,那么可以移除并简单地替换打印头。
需要能够恢复在不移除打印头或隐藏受影响喷头的情况下受不可清除的气泡或粘滞栓柱影响的喷头的能力。这可以消除打印头替换并减小打印机停工时间。
发明内容
本公开的一个方面包含一种用于恢复打印头中的未命中喷头的方法,所述方法包含确定位于所述打印头内的不可清除的气泡和/或粘滞栓柱;将已除气油墨清除到所述打印头中;调整所述打印头中的压力使得油墨流出所述打印头的每一喷嘴的孔隙;在所述油墨流出所述打印头的每一喷嘴的所述孔隙的同时,在预定时间量内向所述打印头反复地施加非激发波形;以及在所述预定时间量之后,将所述打印头中的所述压力调整成正常打印头压力。
本公开的另一方面包含一种在其上存储指令的计算机可读存储媒体,所述指令在由打印头的处理器执行时使得:打印机确定不可清除的气泡和/或粘滞栓柱位于打印头内;将已除气油墨清除到所述打印头中;调整所述打印头中的压力使得油墨流出所述打印头的每一喷嘴的孔隙;在所述油墨流出所述打印头的每一喷嘴的所述孔隙的同时,在预定时间量内向所述打印头反复地施加非激发波形;以及在所述预定时间量之后,将所述打印头中的所述压力调整成正常打印头压力。
附图说明
图1展示用于打印机的清除和擦拭系统的实例实施例。
图2展示根据本公开的实施例的用于恢复不可通过清除恢复的喷头的方法的流程图。
图3展示根据本公开的实施例的实例非激发波形。
图4展示根据本公开的一些实施例的细长非激发波形。
图5展示用于恢复打印机的未命中喷头的实例测试。
图6展示图2中所展示的方法的实例测试。
图7也展示图2中所展示的方法的实例测试。
具体实施方式
如本文中所使用,术语“打印机”一般指代向打印介质涂覆油墨的设备,且可以涵盖出于任何目的执行打印输出功能的任何设备(例如数字复印机、制书机器、传真机器、多功能机器等等)。打印机将油墨图像打印到图像接收部件上,且如本文中所使用的术语“图像接收部件”指代打印介质,或携载油墨图像并将油墨图像传送到打印介质的中间部件,例如滚筒或皮带。“打印介质”可以是实体纸张、塑料,或无论是预切割还是对卷都适用于接收油墨图像的其它合适的实体衬底。如在本文件中所使用,“油墨”指代当涂覆到图像接收部件时为液体的着色剂。举例来说,油墨可以是水性油墨、油墨乳液、融化相变油墨,或已被加热到一种温度且接着返回到凝胶状的凝胶油墨,所述温度使得油墨能够为供涂覆或喷出到图像接收部件上的液体。打印机可以包含例如整理器、进纸器等等的多种其它组件,且可以实施为复印机、打印机或多功能机器。图像大体上包含呈电子形式的信息,信息将通过标记引擎呈现在打印介质上且可以包含文字、图形、图片等等。
如本文中所使用的术语“打印头”指代打印机中被配置成将墨滴喷出到图像接收部件上的组件。典型的打印头包含被配置成将具有一种或多种油墨颜色的墨滴喷出到图像接收部件上的多个喷头。喷头以一个或多个排和列的阵列形式布置。在一些实施例中,喷头以跨越打印头的正面呈交错斜排的形式布置。各种打印机实施例包含将油墨图像形成在图像接收部件上的一个或多个打印头。一些打印机实施例包含布置在打印区域中的多个打印头。图像接收部件(例如容纳潜在油墨图像的打印介质或中间部件)在通过打印区域的行进方向上移动经过打印头。打印头中的喷头在横向行进方向上成排地喷出墨滴,横向行进方向垂直于跨越图像接收部件的行进方向。打印头中的个别喷头喷出墨滴,当图像接收表面在行进方向上移动经过打印头时,所喷出墨滴形成在行进方向上延伸的线。
如本文中所使用,术语“电激发信号”、“激发信号”和“电信号”可互换地使用以指代触发喷头中的致动器以喷出墨滴的电能波形。喷头中的致动器的实例包含但不限于压电致动器和静电致动器。压电致动器包含压电换能器,当将激发信号施加到换能器时,压电换能器会改变形状。换能器接近于容纳液体油墨的压力腔室,且换能器形状的改变促使压力腔室中的一些油墨以墨滴的形式通过出口喷嘴,墨滴是从喷头喷出。在静电致动器中,油墨包含带电颗粒。电激发信号在致动器上产生极性与油墨中的静电电荷相同的静电电荷以将油墨排斥离开致动器,从而从喷头喷出墨滴。
如本文中所使用,术语“峰值电压电平”指代电激发信号的最大振幅电平。如下文更详细地描述,一些激发信号包含具有正峰值电压电平和负峰值电压电平的波形。激发信号波形中的正峰值电压电平和负峰值电压电平可以具有相同振幅或不同振幅。在一些喷头实施例中,激发信号的峰值电压电平响应于激发信号而影响从喷头喷出的墨滴的质量和速度。举例来说,激发信号的较高峰值电压电平增大从喷头喷出的墨滴的质量和速度,而较低峰值电压电平减小所喷出墨滴的质量和速度。因为图像接收表面在行进方向上相对于喷头移动且通常保持与喷头相隔固定距离,所以所喷出墨滴的速度的改变会影响墨滴在行进方向上落在图像接收表面上的相对部位。
如本文中所使用,术语“波形分量”指代电激发信号波形的形状或量值中的任何参数,所述任何参数经调整以响应于具有调整后的分量参数的波形的产生,影响从喷头喷出的墨滴的速度。峰值电压电平和峰值电压持续时间是电激发信号中的波形分量的实例。如下文所描述,喷墨打印机调整一个或多个波形分量(包含峰值电压电平和峰值电压持续时间中的任一个或两个)以在成像操作期间在逐滴基础上调整墨滴的喷出速度。因为不同墨滴喷出图案由于喷头和打印头的特性而引起墨滴速度的变化,所以对波形分量的调整使得能够在成像操作期间较准确地将墨滴图案放置在图像接收表面上。
为了清除气泡并清洁来自打印机中的打印头的油墨,使用清除和擦拭系统100。图1中展示此类系统的实例。所述系统包含打印头组合件104、擦拭器组合件108、清除盖组合件112、清除盘116和控制器170。打印头组合件104是位于打印机内的多个打印头的布置。卷筒120在打印期间移动经过打印头组合件。当设置在先前已知的印刷机中时,打印头150可以交错打印头阵列的形式配置。然而,也可使用其它配置。致动器106操作性地连接到打印头组合件104以使组合件双向地移动,如由邻近于图1中的组合件104的箭头指示。
擦拭器组合件108包含四个致动器140,所述致动器140中的每一个通过旋转轴124操作性地连接到可旋转凸轮128。凸轮配置有擦拭器,如下文所描述。致动器操作以使擦拭器旋转通过在凸轮128之下的清洁流体的储集器,且接着到使得每一擦拭器能够擦拭打印头组合件104的单排中的打印头的正面的位置。移除的油墨落在储集器中,储集器具有倾斜底板,所述倾斜底板使得移除的油墨能够沿着所述底板滑动到排出口136。通过供应端口132将清洁流体提供到储集器。清除盖组合件112包含清除盖,清除盖通常由例如有机硅的顺应性材料制成。这些盖操作性地连接到致动器118,当打印头组合件104移动到与打印头密封组合件相对的位置时,致动器118抬起盖以与打印头的正面啮合。盖具有将被清除油墨引导走以供收集的排出口。在清除期间,接着向打印头中的内部储集器、歧管和通道施加压力以促使油墨通过打印头并到打印头的正面上。在替代实施例中,向密封清除盖施加真空以促使油墨通过打印头。收集被清除油墨,并将其从清除盖110排出。接着通过致动器118降低清除盖110以使得操作性地连接到清除盘116的致动器160能够通过控制器170操作,以使清除盘116在密封盖组合件112与打印头组合件104之间移动。擦拭器144提供在清除盘116内,以接近于打印头组合件104中的打印头150的正面。当组合件104与密封组合件112相对时,盘116中的擦拭器144移除清除之后残留在打印头的正面上的相当大量的油墨。清除盘116的底板倾斜到排出口148以使得能够将移除的被清除油墨收集在垃圾桶中,垃圾桶流体连接到排出口148。
图1的系统按以下方式操作以执行清除操作。清除操作开始于控制器170操作致动器106以使打印头组合件移动经过擦拭器组合件108,同时控制器170操作致动器140以使凸轮旋转,以将擦拭器定位在清洁流体储集器内。当控制器170与密封盖组合件112相对时,控制器170使打印头组合件104停止。在控制器170操作致动器118以升高清除盖110以密封打印头正面之后,将油墨从打印头清除。收集被清除油墨,并将其从盖110排出。控制器170接着操作致动器118以降低密封盖,且控制器操作致动器260以将清除盘移动到密封盖组合件112与打印头组合件104之间的位置。当清除盘移动到与打印头组合件相对的位置时,擦拭器144移除残留在打印头正面上的相当大部分的被清除油墨。控制器170操作致动器160以使清除盘返回到其原始位置,且在这个回缩期间,擦拭器144再次将油墨从打印头正面移除。一旦盘116中返回到其原始位置,控制器170就操作致动器140以使凸轮128旋转,因此擦拭器定位在打印头返回到打印位置的路径中。当控制器170操作致动器106以使打印头组合件104返回到打印位置时,打印头组合件移动经过凸轮128上的擦拭器且擦拭器接触打印头的正面。与擦拭器上的清洁流体耦接的擦除动作将残留的被清除油墨从打印头正面移除。当打印头组合件到达打印开始的打印位置时,控制器170使打印头组合件104停止且完成清除操作。打印头组合件现在准备好打印。
控制器170可实施有通用或专用可编程处理器,可编程处理器执行经编程指令,例如,打印头操作。将执行编程功能所需的指令和数据存储在与处理器或控制器相关联的存储器中。处理器、其存储器和接口电路配置打印机以形成油墨图像,并且更确切地说,以控制打印头150中的喷头的操作以喷出墨滴,从而形成打印图像。这些组件提供在印刷电路卡上或提供为专用集成电路(ASIC)中的电路。电路中的每一个可实施有单独处理器,或多个电路实施在同一处理器上。在替代配置中,电路实施有提供在超大规模集成(VLSI)电路中的离散组件或电路。并且,本文中所描述的电路可实施有处理器、FPGA、ASIC或离散组件的组合。
图2说明用于原位恢复不可通过上文所论述的清除操作恢复的有故障喷头的方法。打印机或用户可以确定喷头未命中且不喷出油墨。当用户通知液滴未命中在输出打印上时,可以手动起始所述方法。或,如果打印机具有扫描能力,那么所述方法可以通过打印机自动地起始。可执行正常清除操作,且接着,如果喷头仍然未命中,那么执行图2的方法。
首先,打印头150定位200在用于收集被清除油墨的清除盖110上方。通过打印头202清除油墨以确保打印头150内存在新鲜的已除气油墨。需要新鲜的已除气油墨来溶解存在于打印头150的一些部分内的气泡。
一旦已执行204清除操作,改变204打印头150的压力直到打印头150的喷头的每一孔隙的弯液面破裂且油墨开始流出孔隙为止。可以通过增大打印头150的背压、减小施加到打印头150的真空或增大施加到清除盖的真空来改变打印头150的压力。流出补充在气泡或粘滞栓柱附近供应新鲜的已除气油墨。在一些实施例中,油墨可以按较高速率流动。然而,在油墨的高流速下,油墨利用率高得多,且更多的油墨被浪费。当油墨恰好很少流出时,即,压力比弯液面破裂的点高几英寸水柱,最小化浪费油墨的量。
在油墨在预定时间量内继续流出孔隙而到清除盖中的同时,以特定频率反复地向所有喷头施加206非激发电压波形。以与液滴激发频率相同或低于液滴激发频率的频率反复地施加非激发波形。举例来说,在一些实施例中,以12kHz的频率施加多个非激发波形。非激发电压波形是不足够强以将油墨从打印头150喷出的波形。在一些实施例中,预定时间量可以是30分钟。在其它实施例中,取决于气泡或粘滞栓柱的严重度,预定时间量可以是15分钟或一小时。
非激发电压波形增大新鲜的已除气油墨与气泡或粘滞栓柱之间的质量交换率,从而减小消除气泡或粘滞栓柱的时间量。非激发电压波形还引起喷头的振动,所述振动可以使气泡或粘滞栓柱从喷头的壁脱离,使得气泡或粘滞栓柱在流出期间进入油墨流。在一些实施例中,在生产期间针对给定的打印头建立非激发电压波形。
在预定时间量之后,关断非激发波形并将打印头150重新调谐208到常压。这引起流出从孔隙停止。然而,打印头150上的面板上将存在油墨,因此执行210正常的清除-擦拭程序以重设置喷头的孔隙中的每一个中的弯液面并清洁面板。此时,打印头150准备好打印。
图3说明非激发波形的各种实例。在打印头的生产期间凭经验确定非激发波形。首先,向喷头施加激发波形。接着,激发波形减小、截断或伸长直到墨滴不再从喷头喷出为止。图3说明激发波形、减小的电压波形和截断的波形。如上文所提及,在打印头150的生产期间确定非激发波形。
图4说明激发波形和作为非激发波形的伸长波形。激发波形的伸长允许喷头驱动器完全地移位,但施加频率需要较低。
图5说明演示本公开的实施例的有效性的实例曲线图。在此实例中,造成不可清除的气泡的事件为在油墨供应阀关闭的情况下进行打印。在所述事件之后,清除打印头,直到未命中喷头的数目不再提高为止。如由附图标记500和502指示,仅流出不会帮助减小喷头的数目。如由附图标记504指示的清除也不会帮助减小未命中喷头的数目。然而,如通过附图标记506、508和510可见,在根据上文关于图2所论述的方法施加非激发(NF)波形的同时进行的流出帮助减小未命中喷头的数目。
图6说明使用上述方法恢复未命中喷头的额外实例结果。图6说明在连续地流出30分钟期间施加非激发波形。30分钟之后,恢复所有未命中喷头。
图7说明用以大致指示使用上述方法恢复所有未命中喷头花费多长时间的另一实例测试。在图7的曲线图中,每六分钟暂停测试以确定多少喷头仍然未命中。如图7中所见,累积18分钟之后,所有未命中喷头使用上述方法得以恢复。在一些喷头未命中或可能由于过多数目个未命中喷头而必须完全移除打印头并替换打印头的情况下,这个方法将允许打印机恢复不可清除的气泡和粘滞栓柱,而非操作打印头。
应了解,可以将上文所公开和其它的特征和功能的变型或其替代方案组合成许多其它不同系统或应用。其中各种目前未预见到或未预期的替代方案、修改、变化或改进可以随后由所属领域的技术人员来进行,并且也旨在由以下权利要求书涵盖。
Claims (10)
1.一种用于恢复打印头中的未命中喷头的方法,包括:
确定所述打印头中的喷头不喷出油墨;
将已除气油墨清除到所述打印头中;
调整所述打印头中的压力,使得油墨流出所述打印头的每一喷嘴的孔隙;
在所述油墨流出所述打印头的每一喷嘴的所述孔隙的同时,在预定时间量内以一定频率向所述打印头反复地施加非激发波形;以及
在所述预定时间量之后,将所述打印头中的所述压力调整成正常打印头压力。
2.根据权利要求1所述的方法,进一步包括在所述打印头中的所述压力处于所述正常打印头压力之后,为所述打印头的每一喷嘴执行清除-擦拭程序。
3.根据权利要求1所述的方法,进一步包括在清除所述打印头中的已除气油墨之前,将所述打印头定位在用于收集被清除油墨的盖上方。
4.根据权利要求3所述的方法,进一步包括在将所述打印头中的所述压力调整成所述正常打印头压力之后,将所述打印头定位在打印介质容器上方。
5.根据权利要求1所述的方法,其中调整所述打印头中的所述压力使得油墨流出每一喷嘴的所述孔隙包含增大打印头背压。
6.根据权利要求1所述的方法,其中调整所述打印头中的所述压力使得油墨流出每一喷嘴的所述孔隙包含减小所施加的真空。
7.根据权利要求1所述的方法,其中所述频率小于或等于液滴激发频率。
8.根据权利要求1所述的方法,其中所述频率是12kHz。
9.根据权利要求1所述的方法,其中所述非激发波形是伸长的激发波形。
10.根据权利要求1所述的方法,其中所述非激发波形是截断的激发波形。
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JP2019034543A (ja) | 2019-03-07 |
US10046558B1 (en) | 2018-08-14 |
KR102373914B1 (ko) | 2022-03-11 |
CN109397881B (zh) | 2021-06-25 |
KR20190019834A (ko) | 2019-02-27 |
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