CN104245327B - 利用多个打印头管芯来进行打印 - Google Patents

利用多个打印头管芯来进行打印 Download PDF

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CN104245327B
CN104245327B CN201280072845.0A CN201280072845A CN104245327B CN 104245327 B CN104245327 B CN 104245327B CN 201280072845 A CN201280072845 A CN 201280072845A CN 104245327 B CN104245327 B CN 104245327B
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print head
print
head die
sampling
code device
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CN104245327A (zh
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L阿贝洛罗塞洛
J.维达福蒂亚
R.布恩斯
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Hewlett Packard Development Co LP
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    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
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    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
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    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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    • B41J2/01—Ink jet
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    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
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    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
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    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04558—Control methods or devices therefor, e.g. driver circuits, control circuits detecting presence or properties of a dot on paper
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04573—Timing; Delays
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    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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
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    • B41J2/01—Ink jet
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    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2135—Alignment of dots
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
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    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
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Abstract

本发明公开了用于打印的方法和装置。利用多个打印头管芯来进行打印。不同打印头管芯中的喷头通过使用上采样的编码器信号中的不同相位来触发。所述不同相位对应于不同打印头管芯之间的打印偏移。

Description

利用多个打印头管芯来进行打印
背景技术
许多喷墨式打印机使用多个打印头管芯来每遍打印多种颜色。多个打印头管芯可以安装在托架中，所述托架跨媒介或在页宽阵列（PWA）中来回扫描。
附图说明
图1是本发明的示例实施例中的打印机100的顶视图。
图2是本发明的示例实施例中的打印机100的框图。
图3是本发明的示例实施例中用于以600dpi进行打印的时序图。
图4示出本发明的示例实施例中从两个打印头管芯所打印的墨滴。
图5是本发明的示例实施例中用于利用多个打印头管芯进行打印的流程图。
具体实施方式
图1-5和以下的描述描绘了特定示例来教导本领域技术人员如何制成并且使用本发明的最佳模式。为了教导发明原理的目的，一些常规方面已经被简化或省略。本领域技术人员将领会到落入本发明的范围内的自这些示例的变型。本领域技术人员将领会到，以下描述的特征可以以各种方式被组合以形成本发明的多个变型。结果，本发明不限于以下描述的特定示例，而是只由权利要求及其等同物所限定。
喷墨式打印机典型地具有一个或多个打印头管芯，其中每个打印头管芯具有喷头的阵列。打印头管芯和媒介相对于彼此而移动。在页宽阵列打印机中，媒介移动经过打印管芯的页宽阵列。其它喷墨式打印机使打印管芯安装在托架上，所述托架跨媒介宽度而来回移动，同时打印条带（swath）的墨。媒介然后在不同的条带之间推进。在这两种情况下，在打印头管芯和媒介之间的运动方向被称为打印方向。打印方向上墨滴在纸上的间隔或分辨率由被发送到打印头管芯的触发脉冲（firingpulse）的频率以及媒介正相对于打印头管芯移动的速度来确定。垂直于打印轴的轴上墨滴在纸上的间隔或分辨率由打印头管芯上的喷头间隔以及所使用的喷头数目来确定。
图1是本发明的示例实施例中的打印机100的顶视图。打印机100是具有打印杆102的页宽阵列打印机，所述打印杆102跨媒介104的宽度而延伸。媒介104在箭头PD所示出的打印方向上移动。打印杆具有被标号为1-N的多个打印头管芯。每个打印头管芯可以用于将一种颜色的墨打印到媒介104上，例如青色、黄色、品红色或黑色。可以存在用于打印相同颜色的多个打印头管芯。每个打印头管芯具有被标号为1-M的一行喷头。每个喷头可以将墨滴分送到媒介104上。实际的打印机将会在每个打印头管芯中具有多于一行的喷头并且可以具有多种颜色，但是为了清楚起见，喷头的行数已经被减少。传感器106被附接到打印杆102并且可以在垂直于打印方向的轴（由箭头108示出）上移动。传感器106可以用于测量在媒介104上所沉积的墨滴的定位。在其它示例中，外部传感器可以用于测量媒介上墨滴的定位。
来自不同打印头管芯的墨滴在媒介上的对准受到不同打印头管芯中喷头行之间的间隔以及媒介正相对于打印头管芯移动的速度所影响。不同打印头管芯中的喷头之间、在打印方向上的间隔是X1。距离X1由于制造容差可以变化，以使得不同打印头管芯中的喷头之间的间隔是非统一的。例如，打印头管芯2和打印头管芯3中的喷头之间的间隔可以是X1+德尔塔（delta），并且打印头管芯3和打印头管芯4中的喷头之间的间隔可以是X1-德尔塔。来自不同打印头管芯的墨滴的对准还可以受到由于通过墨的润湿、干燥、媒介张力变化、媒介速度变化等等所引起的媒介拉伸或收缩所影响。通过测量在媒介上来自不同打印头管芯的墨滴位置，用于不同打印头管芯中喷头的触发脉冲可以被对准/校准，以使得来自不同打印头管芯的滴（drop）对准。
图2是本发明的示例实施例中的打印机100的框图。打印机100包括媒介定位***220、墨传感器106、打印头管芯1-N、编码器226、控制器228以及通信总线230。媒介定位***220可以包括鼓、发动机、传感器、供纸辊、卷取辊（take-uproller）等等。控制器228可以包括一个或多个处理器、专用集成电路（ASIC）、存储器、输入/输出电路等等。通信总线230可以是任何类型的通信总线，例如USB。控制器228通过总线230耦合到媒介定位***220、墨传感器106、打印头管芯1-N、以及编码器226。控制器228中的存储器可以包括易失性和非易失性存储器二者。存储器中所存储的代码，当由控制器228上的处理器执行时使得打印机100采取行动，例如将墨打印在媒介104上。
编码器226可以是150dpi正交编码器并且输出150dpi的编码信号。当使用150dpi编码器信号的所有4个边沿时，生成600dpi编码信号。来自编码装置226的输出被用于得到用于不同打印头管芯的触发脉冲。打印机典型地以多种分辨率进行打印。对于高质量作业，打印机可以以其原生分辨率来进行打印，例如1200点每英寸（DPI）。对于高速度或较低质量的作业，打印分辨率可以是600DPI。对于草稿模式，打印分辨率可以仅仅为300到150DPI。用于每个打印作业的分辨率在打印作业开始之前被选择。一旦已经选择了打印作业分辨率，编码器信号就将被上采样至高于打印分辨率的信号。例如，当以600dpi打印时，编码信号将按4X上采样至2400dpi。上采样的2400dpi信号将被用于将不同打印头管芯之间的触发对准至以打印分辨率的子像素准确性。
图3是本发明的示例实施例中用于以600dpi进行打印的时序图。在图3中，线330是以600dpi运行的基底编码器信号。线332是上采样的编码器信号。在该示例中，基底编码器信号已经按4X进行了上采样，所以上采样的编码器信号332是以2400dpi。线334、336、338和340分别示出了用于打印头管芯1、2、3和4的触发脉冲。线334、336、338和340中的触发脉冲分别是用于打印头管芯1、2、3和4的列同步信号。用于管芯1的列同步被对准至线332中上采样的编码器信号的相位0。用于管芯2的列同步被对准至线332中上采样的编码器信号的相位1。这意味着管芯2将相对于管芯1所打印的墨点偏移1/2400（1/2400th）英寸地打印墨点。1/2400英寸是以600dpi打印分辨率的像素的1/4。
用于管芯3的列同步被对准至线332中上采样的编码器信号的相位3。这意味着管芯3将相对于管芯1所打印的墨点偏移3/2400英寸地打印墨点。用于管芯4的列同步被对准至线332中上采样的编码器信号的相位2。这意味着管芯4将相对于管芯1所打印的墨点偏移2/2400英寸地打印墨点。通过使用这种方法，来自每个打印头管芯的墨滴可以对准至以打印分辨率的子像素准确性。在本发明的一个示例实施例中，上采样率是固定的并且独立于打印分辨率。例如，编码器信号总是按因数4来进行上采样，以使得墨点被对准至打印分辨率的1/4内。
在本发明的另一示例实施例中，上采样率是可变的并且取决于打印分辨率。在该示例中，上采样率将会随着减小的打印分辨率而增大。这可以以恒定的物理距离来维持打印头管芯之间的墨滴对准。例如，当以600dpi进行打印时，上采样率可以是4X并且当以300dpi进行打印时，上采样率将会是8X。在每种情况下，由两个不同打印头管芯所打印的墨滴之间的对准将会是1/2400英寸。这将会是以600dpi的像素的1/4以及以300dpi的像素的1/8。
对于两个打印头管芯所选择的上采样编码器信号的相位对应于从两个打印头管芯所打印的墨滴之间的打印偏移。两个打印头管芯之间的打印偏移可以按以下方式来确定。一个或多个墨滴由两个打印头管芯中的每一个、通过使用用于每个打印头管芯的编码器信号来打印，所述编码器信号应当对准被沉积在媒介上的墨滴。两个打印头管芯中的喷头之间的距离以及经过打印头管芯的媒介速度影响媒介上墨的对准。在一些情况下，用于每个打印头管芯的、应当对准来自两个打印头管芯的墨滴的编码器信号可以不处于相同相位。应当对准的墨滴被打印并且然后墨滴在媒介上的位置或定位被测量。在长打印作业期间，打印机和/或媒介中的条件可能改变，使得应当对准来自两个打印头管芯的墨滴的编码器信号不再对准来自两个打印头管芯的墨滴。
墨滴的定位通过使用墨传感器来测量。打印偏移对应于由两个打印头管芯所打印的墨滴之间的误对准（miss-alignment）。图4示出了本发明的示例实施例中从两个打印头管芯所打印的墨滴。墨滴450已经打印自打印头管芯1。墨滴452已经打印自打印头管芯2。这两个打印头管芯都以与墨滴之间距离为R的间隔相对应的相同分辨率来打印。时间轴/打印方向沿着图4的底部以1/4R的增量延展。来自两个打印头管芯的墨滴或点应当竖直对准。来自打印头管芯1的墨滴自打印头管芯2偏移距离PO。距离PO是打印偏移。在该示例中，打印偏移（距离PO）对应于近似3/8R。
当编码器信号自打印分辨率按因数4而被上采样时，打印管芯之间的误对准可以被校正在打印分辨率的1/4内。图4中的打印分辨率是R。为了对准图4中的墨滴，（图4中）来自管芯1的喷头将在相位1处被触发并且管芯2中的喷头将在相位0处被触发。这将把来自管芯1的滴的定位相对于来自管芯2的墨滴向右移位1/4R。一旦墨滴已经被移位，来自管芯1的墨滴就将被对准至距来自管芯2的墨滴的1/4R内。如果图4中的编码器信号按因数8而被上采样，则打印管芯之间的误对准可以被校正至打印分辨率的1/8或R的1/8内。在该情况下，（图4中）来自管芯1的喷头将在相位3处被触发并且管芯2中的喷头将在相位0处被触发。这将把来自管芯1的滴的定位相对于来自管芯2的墨滴向右移位3/8R。一旦墨滴已经被移位，来自管芯1的墨滴就将被对准至距来自管芯2的墨滴1/8R内。
两个打印头管芯之间的打印偏移可以通过在多个不同位置中打印滴来测量。在一些示例中，通过观看页面中沉积的墨或者所打印的图像来测量墨滴。在其它示例中，要被测量的墨滴可以在页面之间或者在沿着所打印的页面的页边中沉积。因为可以在这些不同位置中测量墨滴，所以打印头管芯之间的打印偏移可以在打印作业期间动态更新。这允许打印头管芯之间的对准在每页的基础上进行调整，如果需要的话。在一些示例中，打印头管芯之间的对准可以在周期性时间段上或者在每个打印作业开始时被更新。在其它示例中，打印头管芯之间的对准可以在每当打印偏移超过阈值时被更新。
图5是本发明的示例实施例中用于利用多个打印头管芯来进行打印的流程图。在步骤570处，打印轴上的打印分辨率被确定。在步骤572处，编码器信号被上采样至高于打印分辨率。在步骤574处，为要对准的两个打印头管芯中的第一个选择上采样的编码信号中的触发相位。并且为要对准的两个打印头管芯中的第二个选择上采样的编码信号中的触发相位。在步骤576处，第一打印头管芯中的喷头以打印分辨率来触发，这开始于用于第一管芯的触发相位。第二打印头管芯中的喷头以打印分辨率来触发，这开始于用于第二管芯的触发相位。
以上示例描述了在使用页宽阵列打印机的情况下来调整打印头管芯的对准。通过使用这种方法来调整打印头管芯的对准还可以针对在托架中具有跨媒介而移动的打印头管芯的喷墨式打印机而进行。

Claims (12)

1.一种打印机，包括：
处于间隔开的关系的至少两个打印头管芯，其中每个打印头管芯包括多个喷头；
提供编码器信号的编码器；
耦合到所述两个打印头管芯和编码器的控制器，所述控制器用以控制打印机；
所述控制器用以将编码器信号上采样至高于打印方向上的打印分辨率；
所述控制器用以选择上采样的编码器信号相位中的第一个用于所述至少两个打印头管芯中的第一个；
所述控制器用以选择上采样的编码器信号相位中的第二个用于所述至少两个打印头管芯中的第二个，其中在上采样的编码器信号相位中的第一个和第二个之间的差异对应于第一打印头管芯和第二打印头管芯之间的打印偏移；
所述控制器用以以打印分辨率来触发第一打印头管芯中的喷头，这开始于上采样的编码器信号相位中的第一个；
所述控制器用以以打印分辨率来触发第二打印头管芯中的喷头，这开始于上采样的编码器信号相位中的第二个。
2.根据权利要求1所述的打印机，此外包括：
墨传感器，所述墨传感器用以感测通过所述至少两个打印头管芯而沉积于在打印机中所加载的媒介上的墨的定位；
耦合到所述墨传感器的控制器，所述控制器用以确定自媒介上墨的定位的打印偏移。
3.根据权利要求2所述的打印机，其中所述控制器周期性确定打印偏移。
4.根据权利要求3所述的打印机，其中当打印偏移超过阈值时，所述控制器重选上采样的编码器信号相位中的第一个和第二个。
5.根据权利要求2所述的打印机，其中所述控制器使用在页面的页边中所打印的墨滴来确定打印偏移。
6.根据权利要求1所述的打印机，其中当所述控制器将编码器信号上采样至高于打印分辨率时，所述控制器使用上采样率，并且上采样率选自下面的上采样率组：4X、6X、8X、10X、12X、16X、32X、64X和128X。
7.根据权利要求1所述的打印机，其中当所述控制器将编码器信号上采样至高于打印分辨率时，所述控制器使用上采样率，并且上采样率取决于打印分辨率。
8.一种用于打印的方法，包括：
确定打印轴上的打印分辨率；
将编码器信号上采样至高于打印分辨率；
确定第一打印头管芯和第二打印头管芯之间的打印偏移；
选择上采样的编码器信号相位中的第一个用于第一打印头管芯；
选择上采样的编码器信号相位中的第二个用于第二打印头管芯，其中上采样的编码器信号相位中的第一个和第二个之间的差异对应于打印偏移；
以打印分辨率来触发第一打印头管芯中的喷头，这开始于上采样的编码器信号相位中的第一个；
以打印分辨率来触发第二打印头管芯中的喷头，这开始于上采样的编码器信号相位中的第二个。
9.根据权利要求8所述的方法，其中所述打印分辨率小于打印轴上的原生分辨率。
10.根据权利要求8所述的方法，其中确定第一打印头管芯和第二打印头管芯之间的打印偏移在打印作业期间进行。
11.根据权利要求8所述的方法，其中确定第一打印头管芯和第二打印头管芯之间的打印偏移通过使用在打印作业中打印在页面之间的墨来进行。
12.根据权利要求8所述的方法，此外包括：
确定第二打印头管芯和第三打印头管芯之间的打印偏移；
选择上采样的编码器信号相位中的第三个用于第三打印头管芯，其中上采样的编码器信号相位中第二个和第三个之间的差异对应于第二打印头管芯和第三打印头管芯之间的打印偏移；
以打印分辨率来触发第三打印头管芯中的喷头，这开始于上采样的编码器信号相位中的第三个。
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