CN1165745A - 纸终端检测装置 - Google Patents

纸终端检测装置 Download PDF

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CN1165745A
CN1165745A CN97109508A CN97109508A CN1165745A CN 1165745 A CN1165745 A CN 1165745A CN 97109508 A CN97109508 A CN 97109508A CN 97109508 A CN97109508 A CN 97109508A CN 1165745 A CN1165745 A CN 1165745A
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detection head
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细见浩昭
高见彻
野村昭夫
中聪
松本义治
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Seiko Epson Corp
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Abstract

本发明提供一种纸终端检测装置,它是为了解决在把卷状记录纸卷回时因移动而不管是否还有能印字的记录纸、都使纸终端检测置动作,不能正确地检测记录纸剩余量这问题的。它的结构是:在设有放入到卷状记录纸S卷芯部75的空间部76里的检测头64的检测杆63上,配置与记录纸S侧面接触的突起部65,只有当检测头64和突起部65都与卷状记录纸S不接触时才使纸终端检测器24动作。

Description

纸终端检测装置
本发明涉及纸终端检测装置,它是对供给打印机的卷状记录纸的终端附近进行检测的。
已知的这种现有技术中、有例如日本专利说明书实公昭61-3872号、实公平1-14597号公开的,在记录纸的剩余量成一定量以下时,使靠向卷状记录纸侧面的检测头进入到记录纸的卷芯部的空间里、使检测开关动作,由此勉强地检测记录纸的剩余量。
但是,在上述现有技术中,会有这种情况出现,即,卷状记录纸因打印机的纸送进动作而摆动、或者纸送进机构向打印机本体某侧移动,使检测头从某个所要求检测位置偏离。在这种情况下,设有检测头的检测杆,因检测头从卷状记录纸侧面脱落而与检测头进入到卷芯部的的空间部里的场合相同地进行转动,从而使检测开关动作。因此,由于现有的纸终端检测器不管是否还有能印字的记录纸、都使纸终端检测装置动作,因而不能正确地检测记录纸的剩余量,会发生记录纸的浪费、可靠性较低。
本发明是为了解决上述现有技术存在的问题而作出的,其目的是提供一种能正确地检测卷状记录纸端的可靠性较高的纸终端检测装置。
为了达到上述目的而作出的本发明的纸终端检测装置是把检测头进入到卷状记录纸的卷芯部的空间部里的动作变换成电气信号,由此来检测这记录纸剩余量变成一定量以下的,其特征在于:它具有检测杆和检测开关,前者是设有检测头以及与检测头离开规定间隔地配置并能与卷状记录纸侧面相接触的突起部的;后者是把检测杆的动作变换成电气信号的。
而且,其特征在于:在检测头与侧面相接触时,检测头的前端部和突起部的前端部是处于侧面的大致相同平面上的。
若用上述结构的纸终端检测装置,由于检测杆设有检测头以及检测头离开规定间隔地配置的突起部,因而在记录纸摆动的情况下,即使检测头从侧面脱落,因突起部与卷状记录纸侧面相接触,检测杆也不使检测开关动作。
由于在检测头与侧面相接触时,检测头的前端部和突起部的前端部处于侧面的大致相同平面上,因而在检测头从侧面脱落、突起部接触着的场合下、检测杆几乎不移动。
图1是装着本发明的打印机的斜视图,表示将盖子框架打开着的状态。
图2是表示将装着本发明的盖子框架关闭着的打印机的侧断面图。
图3是表示上述实施方式中的纸终端检测器的正视图。
图4是表示上述实施方式中的纸终端检测器的侧视图。
图5是表示上述实施方式中的纸终端检测器的动作的示意图,图5(a)表示纸终端检测器切断的状态、图5(b)表示纸终端检测器接通的状态。
下面,参照着图1~图5、详细地说明本发明的纸终端检测装置的最佳实施方式。
图1是从左侧面看到的装着本发明的打印机的在盖子框架10被打开着的状态下的外观图。这个打印机是适用于例如使用POS系统等的收据打印机的,例如是借助热敏方式的印字头39(参照图2)对作为一种记录介质的卷状记录纸S进行印字等记录的、大致上的结构是前方为记录部、纸切断部,后方为存放保持记录纸S用的卷纸存放部。
打印机具有设置在卷纸存放部上方的能自由开关的盖子框架10和用来收放可动刀具32及其驱动机构的自动切割组件11。
盖子框架10以支轴14为中心、能摆动地即,能自由开关地安装着,支轴14是设置由金属等构成的本体构架13两侧的上端部。在盖子框架10上设置着圆弧状盖部15和压纸卷筒18、固定刀具33。上述圆弧状盖部15是用来在关闭盖子框架10时避免与记录纸S接触。
在打开的盖子框架10的内部、配置着树脂制的卷纸保持件17。而且在本体构架13的左侧面上安装着纸终端检测器24,它是用来检测记录纸S的剩余量变少状况的。
图2是表示将盖子框架13关闭着的打印机的侧断面图,表示把记录纸S保持在卷纸保持件17上,进行纸送进的状态。图2表示着在使用初期,外径较大的记录纸S被存放着的状态,当纸被送进,记录纸S的外径变小时,记录纸S就落入到导引部38里。然后,由上述的纸终端检测器24检测记录纸S的外径变小的状况。
从卷状的记录纸S卷回的记录纸被夹持在压纸卷筒18和印字头39之间,当压纸卷筒18回转时由它的摩擦力将纸送进。通过印字头39的记录纸S在可动刀具32和固定刀具33之间通过,朝箭头D方向输出,在所要求的位置使可动刀具32向固定刀具33移动而进行切断。
上面,大致说明了本实施方式的打印机1的整体基本结构。下面,用图3~图5更详细地说明作为本申请发明的特征的纸终端检测器24。
图3、图4是表示本实施方式中的纸终端检测器24的视图,图3是正视图,图4是侧视图。
本实施方式的纸终端检测器24大致上由检测构架62和检测杆63构成,检测构架62和检测杆63全是由纵长构件一起构成的。检测构架62和检测杆63全由丙烯腈、丁二烯、苯乙烯共聚体(ABS)、聚缩醛(POM)等树脂材料构成。而且在检测杆63的基端部对称地地设置着2个支轴63a、63b,如图4所示,检测杆63以这些支轴63a、63b为中心,能自由转动地系紧在检测构架62上。
在检测杆63的前端部设置着与记录纸S的侧面相接的检测头64。这个检测头64虽然由树脂材料构成,但也可与检测杆63形成一体。而检测头64被做成是与检测杆63的纵长方向相垂直地延伸。检测头64如下所述地被做成容易进入到记录纸S的卷芯部57的空间76内的尖细状。
而且如图4所示地,在检测杆63的中央部分设置着下述的突起部65,这个突起部65由例如树脂制的板状构件构成,与检测头64同样地沿着与检测杆63的纵长方向垂直地延伸。这种场合下,突起部65的长度被做成比检测头64的长度稍短些。突起部65可与检测杆63形成一体。
此外,在突起部65的与检测头64相对着的一侧,即,在记录纸S的半径方向的外侧形成倾斜面65a,突起部65的前端部分被形成尖细状。
另一方面,如图4所示,在检测构架62上,形成检测杆63的突起部65放出用的窗部62a。在检测构架62的大致中央部形成支持部66,在这支持部66上设置着限位开关67。于是形成因这检测杆63的转动而使这限位开关67接通、切断。在本实施方式中,是借助由限位开关67内的弹簧67形成的开关销68的压力,将检测杆63压在检测构架62上。用FFC等将这限位开关67连接在控制本打印机的主回路基板(图中没表示)上。
图5是表示本实施方式中的纸终端检测器24的动作的示意图,图5(a)表示纸终端检测器24切断的状态,图5(b)表示纸终端检测器24接通的状态。
如图5(a)所示,在记录纸S的剩余量较多的状态下,由于检测杆63的检测头64或者突起部65与记录纸S的侧面相碰,将检测杆63压回,使限位开关67保持在切断的状态。
但是,在本实施方式的热敏式打印机场合下,由于记录纸S是点式打印地被断续输送,因而就有这样的问题,即,由卷回形成松弛的记录纸在卷状记录纸S幅度方向产生偏移的场合下,对其没法修正。
为了防止发生这种问题,使记录纸S进行一定程度摆动地在卷纸保持件17的导引部38的纸送进侧配置支持面17c,它是坡度较小的斜面。由此,当压纸卷筒18回转,输送记录纸时,卷状记录纸S压在支持面17c上,借助以钝角形成的支持面17a使记录纸S卷回到导引部38。这样,当记录纸S的外径较大时被断续地卷回,同时向外送出。当记录纸S变成小直径时,就难从导引部38脱开,但即使在幅度方向发生偏移,也因重量轻能容易地修正。
当记录纸S变成中等直径,记录纸S的外周移动到与形成钝角的支持部17a相接位置时,虽然检测杆63的检测头64与记录纸S的侧面脱开,但如图5(a)所示,在本实施方式中,记录纸S即使是在摆动场合下,由于检测杆63的检测头64或突起部65中的任何一方与记录纸S的侧面相碰,因而不会使检测杆63转动地将限位开关67保持成切断状态。
然后,当记录纸S的剩余量如图5(b)所示地变成非常少时,由于使记录纸S移动,并使检测杆63的检测头64进入卷芯部75的空间76内,因而限位开关67变成接通状态,它的信号被输送到上述的主回路基盘。由此检测记录纸S的纸终端状态。
这样,由于在检测杆63上设置与记录纸S相对着的突起部65,因而即使记录S处在摆动的场合下,纸终端检测器24能被经常保持成切断状态,所以能防止纸终端检测的错误动作,使本发明申请的效果不会受到连续地送纸和存放部形状的限止。
例如,在点冲击式打印机那样地在短时间间歇地输送记录纸的场合下,当卷状记录纸S被使用而外径变小时,虽然没被瞬间卷回的纸向送进侧移动,但这种场合下,即使检测头64脱离侧面,由于突出部65与侧面相接触,在检测杆63不移动时,仍能正确地检测记录纸的剩余量。
虽然如上所述,突起部65的长度被做成比检测头64的长度稍短,但其长度是用来当检测头64与侧面相接触时,使检测头64的前端部64a和突起部65的前端部65b配置在侧面的大致同一平面上,使其同时接触的。当形成这样的结构时,由于在检测头64从侧面脱开,突起部65接触时检测杆63几乎不移动,因而能提高检测精度。
而且,当检测头64和突起部65的下部设置倾斜面65a时,在替换记录纸S时,把检测杆63的检测头64进入到空间76内的卷芯部75向上方一提起、就能借助倾斜面将检测头64从空间76退出,因而容易将卷芯部75从记录纸存放部除去。若在突起部65的下方也设置倾斜面,则去除去卷芯部75时,即使与突起部65相碰,由这斜面作用,使突起部65向外侧移动,因此卷芯部不会因突起部作用而系紧,能进一步提高处理性能。
虽然本实施方式把规定的距离和形状等设定成能检测用在ECR或电子计算机上的卷状记录纸的卷芯是外径为18mm、内径为12mm,或者外径为22mm、内径为12mm这样2种,但不局限于此,在使用特殊的卷芯场合下也可符合它的卷芯而形成。
而且纸终端检测机构也不局限于使用限位开关,例如可用借助光学的机构检测记录纸的终端的。不过,如本实施方式那样使用限位开关的机构,具有能简单、可靠地检测纸终端的优点。
如上所述,若用权利要求1所述的发明,即使是在卷状记录纸从检测位置移动开的场合下,检测杆的检测头或突起部中的任何一方的与记录纸侧面相接触,检测杆不会使检测开关动作地移动。由此,就大大提高了只在记录纸的剩余量变成一定量以下时才进行检测的检测可靠性。
另外,如权利要求2所述发明的场合下,即使检测头从例如侧面脱落,因突出部与侧面接触着,使得检测杆几乎不移动,所以能更正确地检测记录纸的剩余量。

Claims (2)

1、纸终端检测装置,它是把检测头进入到卷状记录纸的卷芯部的空间部里的动作变换成电气信号,由此来检测这记录纸剩余量变成一定量以下的,其特征在于:它具有检测杆和检测开关,前者是设有检测头以及与检测头隔开规定间隔地配置并能与卷状记录纸侧面相接触的突起部的;后者是把检测杆的动作变换成电气信号的。
2、如权利要求1所述的纸终端检测装置,其特征在于:在检测头与上述侧面相接触时,上述检测头的前端部和突起部的前端部是处于上述侧面的大致相同平面上的。
CNB971095086A 1996-03-06 1997-03-06 纸终端检测装置及装有该装置的打印机 Expired - Lifetime CN1134347C (zh)

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EP0794065B1 (en) 2004-06-30
US5884861A (en) 1999-03-23
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EP1093928B1 (en) 2005-11-16
KR970064962A (ko) 1997-10-13
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CN1134347C (zh) 2004-01-14
KR100335575B1 (ko) 2002-09-27
DE69734686D1 (de) 2005-12-22
EP0794064A3 (en) 1998-01-28
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EP0794064A2 (en) 1997-09-10
DE29724856U1 (de) 2004-10-07

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