CN104936789A - 测试打印头 - Google Patents
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- 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
- B41J2/0451—Control methods or devices therefor, e.g. driver circuits, control circuits for detecting failure, e.g. clogging, malfunctioning actuator
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- 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
- B41J19/00—Character- or line-spacing mechanisms
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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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- 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
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- B41J2/04526—Control methods or devices therefor, e.g. driver circuits, control circuits controlling trajectory
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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
- B41J2/0456—Control methods or devices therefor, e.g. driver circuits, control circuits detecting drop size, volume or weight
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04561—Control methods or devices therefor, e.g. driver circuits, control circuits detecting presence or properties of a drop in flight
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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- 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
- B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads
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- 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
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- B41J2/2142—Detection of malfunctioning nozzles
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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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
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Abstract
公开了一种用于测试打印头的系统和方法。所述系统包括安装在可移动托架上的光学传感器。在所述喷嘴喷射油墨的同时,所述光学传感器移动经过要在所述打印头上测试的喷嘴。所述光学传感器的输出信号可以被用于确定所喷射的油墨的轨迹不正确的时间。
Description
背景技术
喷墨打印机通过从打印头喷射墨滴来将图像打印到媒介上。每个打印头典型地具有将墨滴喷射到媒介上的喷嘴阵列。在喷嘴被插入或将墨滴错误地喷射到媒介上的不同位置时,打印输出的图像质量可能降低。随着每个打印头喷嘴数目的增加,检测不正确地运行的喷嘴变得更加困难。
附图说明
图1是示例打印机的框图。
图2是联接至存储器104的处理器102的示例框图。
图3是示例光学传感器系统300的等距视图。
图4是测试打印头的示例方法的流程图。
图5A是光束342的示例顶视图,其中墨滴340A具有正确轨迹。
图5B是光束342的示例顶视图,其中墨滴340B具有不正确轨迹。
图6A是在打印头测试期间的不同时刻,图5A中的光束的示例截面图。
图6B是在打印头测试期间的不同时刻,图5B中的光束的示例截面图。
图7A是图5A和图6A中示出的墨滴340A的光检测器334输出的曲线图。
图7B是图5B和图6B中示出的墨滴340B的光检测器334输出的曲线图。
具体实施方式
图1是示例打印机的框图。打印机包括全部一起联接在总线112上的处理器102、存储器104、输入输出(I/O)模块106、打印引擎108和控制器110。在一些示例中,打印机还可以具有显示器、用户接口模块、输入设备等,但是为了清楚起见,这些项目未被示出。处理器102可以包括中央处理单元(CPU)、微处理器、专用集成电路(ASIC)或这些设备的组合。存储器104可以包括易失性存储器、非易失性存储器和存储设备。存储器104是非瞬态计算机可读介质。非易失性存储器的示例包括但不限于电可擦除可编程只读存储器(EEPROM)和只读存储器(ROM)。易失性存储器的示例包括但不限于静态随机存取存储器(SRAM)和动态随机存取存储器(DRAM)。存储设备的示例包括但不限于硬盘驱动器、光盘驱动器、数字通用光盘驱动器、光学驱动器和闪存设备。
I/O模块106被用于将打印机联接至其它设备,例如因特网或计算机。打印引擎108可以包括媒介供给系统、一个或多个打印头、用于测量由打印头喷射的油墨的光学传感器系统、油墨供给系统等。打印机具有存储在存储器104中的代码,典型地称为固件。固件作为计算机可读指令被存储在非瞬态计算机可读介质(即,存储器104)中。处理器102通常检索并执行存储在非瞬态计算机可读介质中的指令以操作打印机。在一个示例中,处理器执行引导控制器110测试打印头的代码。
图2是联接至存储器104的处理器102的示例框图。存储器104包含固件220。固件220包含打印头测试模块224。处理器102执行打印头测试模块224中的代码来引导控制器110测试打印头。在一个示例中,打印头测试模块促使打印机检查打印头中的每个喷嘴以确定墨滴是否从正确的轨迹中的喷嘴喷射。
图3是示例光学传感器系统300的等距视图。
光学传感器系统300包括可移动托架330、光发射器332、光检测器334和打印头336。光发射器332和光检测器334被安装在托架上并对准为使得从光发射器332发出的光束342被光检测器334接收。在一些示例中,光束342具有圆形横截面。在其它示例中,光束可以具有椭圆形或长方形横截面。托架330沿着打印头336下面的X轴移动。在一些示例中,托架移动的方向与打印期间纸张移动的方向相对应。在其它示例中,托架在与打印期间纸张移动的方向垂直的方向上移动。托架相对于打印头的相对位置可以由联接至托架运动系统的线性或摆角传感器确定,或者可以使用电机控制信息来确定。
打印头336包括多个喷嘴。喷嘴338被示出为喷射墨滴流340。为了清楚起见,图3中的喷嘴被示出为间隔大的距离。在实际应用中,沿着打印头每英寸可以存在多达1200个喷嘴,并且可以存在多行喷嘴。打印头336典型地使用将打印头安置在打印机中的打印头底座(未示出)联接至打印机。在一些示例中,可以存在安装在打印机中的多个打印头。打印头可以通过打印头底座永久地安装在打印机中,或者可以是可替换的。
随着托架在打印头336下面移动,墨滴流340与光束342相交。在墨滴流340与光束342相交时,光检测器334接收的光量改变。来自光检测器334的信号的改变可以被用于确定墨滴流340是否直流而下(沿着Z轴)或者墨滴流340是否以相对于Z轴的某个角度行进。
图4是测试打印头的示例方法的流程图。在步骤440,托架被定位为使得光束342在要检查的喷嘴的一侧上,使得由喷嘴喷射的油墨不会与光束342相交。在步骤442,从喷嘴喷射油墨的同时,朝向喷嘴移动托架。在一些示例中,托架以每秒10英寸和每秒0.1英寸之间的恒定速度移动,例如每秒1英寸。在一个示例中,光束的直径在0.05英寸和1英寸之间,例如直径为0.1英寸。托架会移动直到光束342在要检查的喷嘴的另一侧上使得由喷嘴喷射的油墨不与光束342相交。
在一个示例中,当托架移动时,墨滴的连续流从喷嘴喷射。在其它示例中,墨滴串(burst)从喷嘴喷射。该串可以包含每个串4-20滴,并且每滴可以以墨滴之间具有40-170微秒(6kHz至24kHz之间的喷墨频率)的间隙的方式被喷射。在一个示例中,串之间存在100微秒至2000微秒之间的间隔或间隙。在一些示例中,托架可以不以恒定速度移动。反而,在每个滴串之间,托架可以移动小量。每个串的滴数、滴之间的间隔、串之间的间隔和托架移动速率可以根据系统测量速度、气溶胶扩散率、油墨颜色或不透明性等而改变。
在步骤444,来自光检测器334的信号被分析以确定由喷嘴喷射的油墨是否具有正确的轨迹。沿着Z轴从打印头(即,垂直于打印头)直流而下的墨滴具有正确的轨迹。在相对于Z轴形成一角度的路径中行进的墨滴具有不正确的轨迹。该方法可以针对打印头中的每个喷嘴重复。在喷嘴被检测为使用不正确的轨迹喷射油墨时,根据不正确轨迹的大小,喷嘴可以是未激活的,并且可以替换为不同的喷嘴。在一些示例中,喷嘴可以完全不喷射油墨。这还可以通过分析来自光检测器334的信号来确定。
图5A是光束342的示例顶视图,其中墨滴340A具有正确轨迹。图5A示出托架330,具有安装在托架330上的光发射器332和光检测器334。如箭头550所示,托架在X轴上移动。墨滴340A具有垂直于打印头(参见图3)并且与Z轴平行的轨迹。墨滴340A被示出在打印头测试的中间的时刻Tm处于光束342的中央的位置。为了清楚起见,墨滴的大小显著地增加。
图5B是光束342的示例顶视图,其中墨滴340B具有不正确轨迹。图5A中的墨滴在与打印头不垂直的轨迹中行进。该轨迹不与Z轴平行,而是与Z轴产生角度。图5B中的墨滴在X轴和Y轴上都偏移。只有X轴上的偏移可以通过观察光传感器334的输出来确定。Y轴的偏移不可以通过来自光传感器334的信号检测。
图6A是在打印头测试期间的不同时刻处图5A中的光束的示例截面图。垂直轴对应于图5A中的Z轴。在打印头测试期间的不同时刻,水平轴对应于图5A中的X轴。在时刻T0,光束342被定位于墨滴串340A的左侧。在时刻T1,光束已经移动至右侧,使得墨滴串只与光束的右侧边缘或前沿相交。在时刻Tm,墨滴串穿过光束的中央。在墨滴穿过光束的中央时,时刻Tm对应于图5A中示出的时刻。在时刻Ti,光束移动,直到墨滴串只与光束的左边缘或后沿相交。
图6B是在打印头测试期间的不同时刻,图5B中的光束的示例截面图。垂直轴对应于图5B中的Z轴。在打印头测试期间的不同时刻,水平轴对应于图5B中的X轴。图6B中的墨滴不遵循与Z轴平行的轨迹。在时刻T0,光束342被定位于墨滴串340B的左侧。在时刻T1,光束已经移动至右侧,使得墨滴串应当与光束的右侧边缘或前沿相交。但是由于墨滴的轨迹远离光束成一角度,所以墨滴也不与光束的前沿相交。在时刻Tm,墨滴串应当穿过光束的中央。在这个示例中,墨滴一定穿过光束,但是不穿过光束的中央。在时刻Ti,光束移动,直到墨滴串只与光束的左边缘或后沿相交。由于墨滴的轨迹朝向托架运动的方向成一角度,所以墨滴仍旧与比它应该相交的数目多的光束相交。
在光束相对于喷嘴处于不同位置时,来自光检测器334的输出信号是来自与光束相交的连续墨滴串的响应。在喷嘴以正确轨迹启动时,对于每一个光束位置,信号输出几乎是一样的。在墨滴串在光束的任一边缘处时,信号会较小,但是信号图案是一样的。在墨滴轨迹不正确时,在光束的不同位置处检测到墨滴串,并且具有不同图案。
图7A是图5A和图6A中示出的墨滴340A的光检测器334输出的曲线图。垂直轴是光检测器334的信号响应。水平轴是在打印头测试期间的不同时刻处光束相对于喷嘴位置的位置。线770A是在打印头测试期间的不同时刻/位置处光检测器334的输出。在时刻T0,光束342被定位在墨滴串340A的左侧并且信号是低背景水平。在时刻T1,光束已经移动至右侧,使得墨滴串只与光束的右侧边缘或前沿相交,导致信号急剧增大。在时刻Tm,墨滴串穿过光束的中央,其中信号拉平为最高水平。在时刻Ti,光束移动,直到墨滴串只与光束的左边缘或后沿相交,并且信号快速回落至低背景水平。
图7B是图5B和图6B中示出的墨滴340B的光检测器334输出的曲线图。垂直轴是光检测器334的信号响应。水平轴是在打印头测试期间的不同时刻处光束相对于喷嘴位置的位置。线770B是在打印头测试期间的不同时刻/位置处光检测器334的输出。在时刻T0,光束342被定位在墨滴串340B的左侧并且信号是低背景水平。在时刻T1,光束已经移动至右侧,使得墨滴串应当与光束的右侧边缘或前沿相交。
在这种情况下,由于墨滴的轨迹是不正确的,所以在指示墨滴还未与光束相交的时刻T1,信号仍旧处于低背景水平。信号770B不会开始增加,直到时刻Tx。因此,墨滴不会开始与光束相交,直到光束已经移动至对应于时刻Tx的位置。使用已知的托架移动速率、光束直径和托架相对于在测试下的喷嘴的相对位置,油墨轨迹在X轴上的偏移和偏移方向可以被估计。在时刻Tm,墨滴串应当穿过光束的中央。在时刻Tm,信号到达最高水平,但是输出曲线的形状不具有非常平坦的最高水平。在时刻Ti,光束本应该移动,直到墨滴串只与光束的左边缘相交。然而,由于墨滴的轨迹是不正确的,所以信号仍旧是高的,并且没有开始回落至低背景水平。
使用光检测器输出曲线的形状和信号增加和减小时的位置,针对给定喷嘴的墨滴的轨迹可以被确定。在一个示例中,打印机内的固件可以运行打印头测试。在其它示例中,联接至打印机的外部计算机可以运行打印头测试。
Claims (15)
1.一种测试打印头的方法,包括:
将光学传感器定位在所述打印头中至少一个喷嘴的一侧上,使得来自所述光学传感器的光束的前沿与喷嘴位置间隔开;
从所述至少一个喷嘴喷射油墨;
在所述光学传感器进行测量的同时,在与所述光束垂直的方向上朝向所述至少一个喷嘴移动所述光学传感器;
在所述光学传感器进行测量的同时,移动所述光学传感器经过所述喷嘴位置,使得所述光束的后沿处于所述喷嘴位置的另一侧上并与所述喷嘴位置间隔开;
分析所述光学传感器测量值以确定所喷射的油墨轨迹。
2.根据权利要求1所述的方法,其中所述光学传感器以恒定速度移动。
3.根据权利要求1所述的方法,其中所述油墨以串的形式从所述至少一个喷嘴喷射,所述串之间具有间隙。
4.根据权利要求3所述的方法,其中所述串包括4滴和20滴之间的墨滴。
5.根据权利要求3所述的方法,其中所述串之间的间隙在100微秒和2000微秒之间。
6.根据权利要求1所述的方法,其中光学传感器在与所述打印头的打印方向平行的方向上移动。
7.根据权利要求1所述的方法,其中在所喷射的油墨轨迹不正确时,所述喷嘴被禁用。
8.根据权利要求1所述的方法,其中所述光束具有0.05英寸和1英寸之间的直径。
9.一种打印机,包括:
至少一个打印头底座,用于安装打印头,所述打印头具有多个喷嘴以将油墨喷射到媒介上;
安装在可移动托架上的光学传感器,所述光学传感器包括光源和光检测器,所述光源朝向所述光检测器发射光束;
所述光学托架在第一位置和第二位置之间可移动,使得在所述托架从所述第一位置移动至所述第二位置时,所述光束的全宽度在所述多个喷嘴下行进;
联接至存储器的处理器,所述存储器包括计算机可读指令,所述计算机可读指令在由所述处理器执行时,通过下述步骤促使所述打印机测试安装在所述至少一个打印头底座上的打印头:
在将所述托架从所述第一位置移动至所述第二位置的同时,从所述多个喷嘴中的至少一个喷嘴喷射油墨;
分析来自所述光检测器的输出以确定所喷射的油墨轨迹。
10.根据权利要求9所述的打印机,其中所述托架以恒定速度移动。
11.根据权利要求9所述的打印机,其中所述油墨以串的形式从所述多个喷嘴中的所述至少一个喷嘴喷射,所述串之间具有间隙。
12.根据权利要求11所述的打印机,其中所述串包括4滴和20滴之间的墨滴。
13.根据权利要求9所述的打印机,其中所述托架在与所述打印机的打印方向平行的方向上移动。
14.根据权利要求9所述的打印机,其中在所喷射的油墨轨迹不正确时,所述喷嘴被禁用。
15.根据权利要求9所述的打印机,其中所述光束具有0.05英寸和1英寸之间的直径。
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