喷墨打印机用墨盒 技术领域 本发明涉及喷墨打印机用墨盒。该墨盒具有同储墨腔相连通的供墨腔， 其 储墨腔或供墨腔中设置有用于检测墨水容量的检测腔和检测浮标。本发明基于 申请日为 2006年 11月 29日、申请号为 200610124020. 5的中国发明专利申请， 该申请的发明内容作为参考引入本文。 背景技术 习知的喷墨打印机， 都是通过喷嘴向记录纸张喷射墨水进行打印，所使用 的墨水比重介于 1. 04〜1. 06g/cm3之间。 喷墨打印机通常采用可拆装的墨盒。 在打印机驱动喷墨头进行喷墨操作时，如发生墨盒储墨腔甚至同储墨腔相连通 的供墨腔中的墨水耗尽的情形， 将使墨盒中的空气侵入到喷墨头中。侵入空气 的喷墨头在许多情况下是不能使用的，例如侵入的空气会在喷墨头墨水通路中 形成气阻， 妨碍墨水流动， 或者侵入的空气连同墨水一道从喷嘴中射出， 造成 打印断线或无墨。 因此， 必须检测存储在墨盒中的墨水容量， 以防发生这种情 况。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink cartridge for an inkjet printer. The ink cartridge has an ink supply chamber communicating with the ink storage chamber, and a detection chamber and a detection buoy for detecting the ink capacity are disposed in the ink storage chamber or the ink supply chamber. The present invention is based on a Chinese patent application filed on Nov. 29, 2006, filed on Jan. 29, 2006, the disclosure of which is hereby incorporated by reference. BACKGROUND conventional inkjet printer, printing is performed by the nozzle to a recording paper ejecting ink, the ink used in the proportion of between 1. 04~1. 06g / cm 3. Inkjet printers typically use removable ink cartridges. When the printer drives the ink jet head to perform the ink jet operation, such as the occurrence of ink exhaust in the ink supply chamber of the ink cartridge or even the ink supply chamber communicating with the ink storage chamber, the air in the ink cartridge is intruded into the ink jet head. Ink-injecting heads are unusable in many cases. For example, invading air can form a gas barrier in the ink path of the ink-jet head, hindering the flow of ink, or invading air from the nozzle together with the ink, causing the printing to break. Line or no ink. Therefore, the amount of ink stored in the ink cartridge must be detected to prevent this from happening.
CN200410083213 号发明专利申请公开了一种具有检测机构的墨盒， 由可 用于存储墨水的储墨腔和置于储墨腔中的光闸机构构成。光闸机构包括一可摆 动地支撑的连杆。连杆一端部设有光闸， 而另一端部设有浮子。浮子的重量和 体积如此设定，当整个光闸机构设置在墨水中时连杆在所产生出的浮力和重力 的作用下运动的第一方向与其中当一部分浮子从墨水液面中伸出时连杆在浮 力和重力的作用下运动的第二方向相反。墨水的剩余量可以在不会受到干扰例 如墨水表面张力过分影响的情况下被指示出。该墨盒可以准确地对墨腔内的墨 量进行检测， 但结构过于复杂， 使得墨盒的制造成本太高。 为解决结构复杂的问题， 还有另外一种检测墨水容量的方法，将储墨腔或 同储墨腔相连通的供墨腔分隔出一个检测腔。检测腔用透光材料制成， 内置一 个兼作光闸的浮标。浮标用不透光的材料制作， 以此来对打印机发出的检测光
进行遮挡。但是， 有时受墨水表面张力的干扰或其它因素的影响， 常使浮标黏 附于检测腔内壁表面， 导致浮标停顿于或停滞于某一位置， 不随墨水液面的下 降而下降。 此外， 在运输过程中如发生墨盒倒置、 振动或其它情形， 使气体进 入检测腔， 那么在装机使用时， 浮标将示出检测腔内水气相混和的液面状态， 而不能正确给出储墨腔或供墨腔满墨的真实状态，从而导致喷墨打印机发出少 墨或墨尽， 提醒使用者更换墨盒的错误信号。 发明内容 本发明目的在于提供一种喷墨打印机墨盒。这种墨盒， 其检测腔内的浮标 不会粘贴在检测腔侧壁上而导致墨水容量检测失灵，能正确指示储墨腔或同储 墨腔相连通的供墨腔中的墨水容量。 为实现上述目的， 发明人采用具有如下特点的喷墨打印机墨盒。它包括用 于储存墨水的储墨腔，与储墨腔相连通并把该储墨腔中的墨水输送至喷墨头的 供墨腔和用于检测墨水存量的检测腔， 以及位于该检测腔中的浮标， 其中浮标 的密度介于 1. 00〜： 1. 06g/cm3范围内。 前述喷墨打印机墨盒， 其浮标的密度可选为 1. 02〜1. 03g/cm3。 上述喷墨打印机墨盒，其浮标最好使用由聚丙烯同丙烯腈一丁二烯一苯乙 烯三元共聚物按以下重量比例混合得到的材料，聚丙烯：丙烯腈一丁二烯一苯 乙烯三元共聚物 = 2： 8。 优选地， 前述喷墨打印机墨盒， 其检测腔位于供墨腔中且同供墨腔连通。 择优地， 前述喷墨打印机墨盒， 其检测腔位于储墨腔中且同储墨腔连通。 附图说明 图 1是本发明喷墨打印机墨盒透视图一； 图 2是本发明喷墨打印机墨盒透视图二
图 3是本发明喷墨打印机墨盒结构示意图; 图 4是本发明喷墨打印机墨盒俯视图； 图 5是图 4的 A-A剖视图。 以下结合实施例及其附图对本发明作进一歩说明。 具体实施方式 参见图 1、 2， 本发明喷墨打印机墨盒。 图中以供墨口 35位于墨盒 1垂向 底部的方式作为制图基础， 与墨盒的正常使用状态相同。墨盒 1由盒盖 2和盒 体 3构成。盒盖 2和盒体 3均采用塑料制备， 两者通过热熔悍或振动熔悍连接 为一密闭体， 内部形成相应的中空腔室。盒盖 2位于盒体 3顶部， 即相对于供 墨口 35所在的部位。 参见图 1、 4、 5， 盒盖 2背对盒盖 3的裸露部分设置有方便操作者握持和 协同打印机进行墨盒空间定位的手柄 21以及用于充填墨水的注墨孔 22。在墨 盒 1注满墨水的状态下， 注墨孔 22可由塑料胶塞密封。 参见图 3、 5， 在盒体 3上设置有由侧壁和内部相应隔板包围形成的储墨 腔 31。 它用于容纳和储备墨水。 气道 32通过位于盒体 3底部的端口和位于储 墨腔 31垂向上部的端口使储墨腔 31与外部大气相连通。 通过供墨口 35， 把 容贮于供墨腔 38中的墨水供应至喷墨打印机的供墨针。供墨腔 38是介于储墨 腔 31和供墨口 35之间的一个腔室， 它与供墨口 35直接连通， 与储墨腔 31 则通过单向阀 36、 37调控后连通。 单向阀 37， 对于储墨腔 31和供墨腔 38的 墨水通道具有开启 /关闭的控制作用， 在储墨腔 31内压力大于供墨腔 38时， 开启该墨水通道； 在储墨腔 31内压力小于供墨腔 38时， 关闭该墨水通道。单 向阀 36， 是在供墨腔 38内压力出现瞬间变化而大于储墨腔 31时将供墨腔 38 内压力释放至储墨腔 31的卸压阀， 其控制过程与单向阀 37相同。 因此， 在储 墨腔 31和供墨腔 38之间， 单向阀 37和单向阀 36的开启方向互为相反。在供 墨腔 38的较高液位位置， 靠近盒体 3的一个垂向侧壁， 设置检测腔 33和置于
检测腔内的浮标 34， 用于检测墨盒 1中的墨水存量。 参见图 2、 3、 5， 详细介绍盒体 3的构造。 检测腔 33位于供墨腔 38的较高液位位置， 其底部与供墨腔 38的顶部相 连通， 其顶部用一薄膜 331予以密封。浮标 34在检测腔 33内随墨水液面的变 化而升降。浮标 34的密度可介于 1. 00〜1. 06g/cm3范围内，最好是选在 1. 02〜 1. 03g/cm3范围内。 一般使用由聚丙烯同丙烯腈一丁二烯一苯乙烯三元共聚物 按以下重量比例混合得到的材料制作浮标，聚丙烯：丙烯腈一丁二烯一苯乙烯 三元共聚物 = 2 : 8。 墨盒 1在使用前， 浮标 34受墨水浮力的作用， 悬浮于检 测腔 33内容贮的墨水溶液中， 因其密度稍低于墨水溶液， 因此其上部端面或 平面与检测腔 33 内容贮的墨水液面保持几乎齐平或稍稍露出墨水液面的状 态。 为墨盒制造方便， 一般在检测腔 33侧面开设敞口以便装入浮标 34， 之后 再用薄膜封闭该开口。 为方便监测， 盒体 3采用透明的或可透光的材料制备。 这样在目测或使用光传感器的情况下，就可以方便地监测墨盒中墨水的液位状 况。 当然， 也可以把检测腔 33设置成连通储墨腔 31以监测储墨腔 31内的墨 水。 气道 32入口位于墨盒 1的底部， 出口位于储墨腔 31的顶部， 气道 32入 口处设置有一导气腔 321 (见图 2 )， 一防漏海绵 322放置在导气腔 321内并完 全充满导气腔 321， 用于防止漏墨。 导气腔 321位于下部的开放端部侧壁上设 置有两个导气槽 3211 (见图 2)， 用于把外部大气引入导气腔 321。导气腔 321 的开放端口则用一密封薄膜 323密封。 墨盒 1的底部对应于气道 32入口处还 设置有另一个腔室 324， 导气腔 321位于腔室 324内， 且腔室 324的开口端面 用一薄膜 3241密封。 薄膜 323密封导气腔 321的开放端口之后， 不仅不影响 两个导气槽 3211保持连通外部大气和导气腔 321的状态， 而且可压紧防漏海 绵 322。 薄膜 3241在储运状态下使墨盒 1与外部空气完全隔离。 当用户使用 墨盒 1时， 只需撕去腔室 324开口端面上的薄膜 3241， 外部的空气会通过导 气槽 3211， 进入储墨腔 31中， 使储墨腔 31与外部空气连通。 储墨腔 31的底部相对于气道 32入口的一端设有一个供墨口 35。 供墨口
35的内部设置有一密封圈 351，其开启端口径向尺寸同喷墨打印机的打印针针 杆尺寸相匹配，用于接纳墨水的喷墨打印机打印针经过密封圈 351插入至供墨 口 35内。 供墨口 35的开口端面用一薄膜 352予以密封。 在储墨腔 31至供墨腔 38的墨水连接通道中设置有一单向阀 37。 单向阀 37的圆柱壁上设有一沿其轴向延伸并贯通圆柱壁的切口狭缝 371。 单向阀 37 通过切口狭缝 371开启 /关闭前述墨水连接通道。 在储墨腔 31和供墨腔 38之间还设置有另一独立的单向阀 36， 单向阀 36 圆柱壁上设有一沿其轴向延伸并贯通圆柱壁的切口狭缝 361。 当供墨针插入供 墨口 35引起供墨腔 38内墨水压力增大时， 单向阀 36受径向膨胀力的作用而 开启切口狭缝 361， 将压力增大部分释放至储墨腔 31 内， 并与外部大气形成 交换， 保持平衡。 从而有效地避免更换喷墨打印机墨盒时在供墨口 35部位产 生漏墨的现象，也有效地避免喷打印机的打印头因承受墨水压力过大而受到损 坏的现象的发生。 单向阀 37和单向阀 36均采用具有弹性的材料例如橡胶制备，其形状呈一 端封口的圆柱筒。 圆柱筒的开口端套接于墨盒的相应连接端口上， 其圆柱壁上 均开设有沿自身轴向延伸并贯通圆柱壁的切口缝隙 371和 361。在没有外力作 用的状态下， 或者圆柱筒内腔压力小于圆柱筒外部压力的情形， 单向阀 37和 36的切口缝隙 371和 361 由其相对的两壁自然压贴合拢或者由其拱形结构形 成挤压合拢，产生关闭效应， 可以阻止液体经切口缝隙由圆柱筒外部进入圆柱 筒内腔。当圆柱筒内腔压力大于圆柱筒外部压力的情形， 单向阀 37和 36的切 口缝隙 371和 361 由于圆柱筒内腔中的介质体积膨胀而扩张， 切口缝隙 371 和 361相对的两壁向圆柱筒外部张开， 扩大切口缝隙 371和 361的径向尺寸， 产生连通效应， 使圆柱筒内腔中的介质流向圆柱筒外部。 储墨腔 31 的底部设有一凹槽， 用薄膜密封槽口后构成连通管 311。 储墨 腔 31中的墨水经连通管 311， 进入单向阀 37，进入单向阀 37的墨水再经过切 口缝隙 371进入供墨腔 38。 当储墨腔 31和单向阀 37内的墨水消耗完后， 由 气道 32引入的空气会沿着墨水通道进入检测腔 33， 与检测腔 33中的墨水进
行交换， 于是开始消耗检测腔 33内的墨水。检测腔 33中的墨水经过其底部的 端口进入供墨腔 38并流至供墨口 35。 随着检测腔 33中墨水的消耗， 浮标 34 会随检测腔 33中的墨水液面逐歩下降， 当下降到浮标 34底部触及检测腔 33 下部腔壁时， 打印机发射的检测光检测不到不到浮标 34， 随即显示墨尽。 工业应用性 根据本发明的喷墨打印机墨盒， 针对使用比重 1. 04〜1. 06g/cm3的墨水， 采用密度介于 1. 00〜1. 06g/cm3范围内的浮标后， 使浮标的比重同墨水溶液相 匹配或稍低于墨水，进而达到浮标整体在墨水溶液中受到的浮力同其自身所受 重力基本相同， 使浮标悬浮于墨水溶液中。这样， 即使有空气进入墨盒检测腔 中， 造成其内存在固体和液体共存的状态， 浮标也始终悬浮于墨水溶液中， 并 随墨水溶液表面液位的升降而升降。 除了墨水溶液耗尽导致检测腔干涸的情 形， 浮标不会因为存在多相物态的情形而黏附于检测腔壁上， 而保持始终悬浮 于墨水溶液单一液相中的状态。这样，浮标将保持于检测腔中相对稳定的位置， 在该位置， 浮标对喷墨打印机发出的检测光形成阻挡， 完成墨水容量的检测。
CN200410083213 The invention patent application discloses an ink cartridge having a detecting mechanism, which is composed of an ink storage chamber which can be used for storing ink and a shutter mechanism which is placed in the ink storage chamber. The shutter mechanism includes a link that is swingably supported. One end of the connecting rod is provided with a shutter, and the other end is provided with a float. The weight and volume of the float are set such that when the entire shutter mechanism is disposed in the ink, the first direction of movement of the link under the generated buoyancy and gravity and when a portion of the float protrudes from the ink level The second direction of movement of the connecting rod under the action of buoyancy and gravity is opposite. The remaining amount of ink can be indicated without being disturbed, such as excessive influence of the surface tension of the ink. The ink cartridge can accurately detect the amount of ink in the ink chamber, but the structure is too complicated, so that the manufacturing cost of the ink cartridge is too high. In order to solve the problem of complicated structure, there is another method for detecting the ink capacity, and the ink supply chamber or the ink supply chamber communicating with the ink storage chamber is separated into a detection chamber. The detection chamber is made of a light-transmitting material and has a buoy that doubles as a shutter. The buoy is made of an opaque material to detect light from the printer. Blocking. However, sometimes it is affected by the interference of the surface tension of the ink or other factors, which often causes the buoy to adhere to the inner wall surface of the detection chamber, causing the buoy to pause or stagnant at a certain position, and does not fall with the drop of the ink level. In addition, if the ink cartridge enters the detection chamber during the transportation process, such as ink cartridge inversion, vibration or other conditions, the buoy will show the liquid level state of the water vapor phase mixing in the detection chamber when the machine is used, and the ink storage cannot be correctly given. The true state of the cavity or the ink supply chamber is full of ink, which causes the inkjet printer to emit less ink or ink, reminding the user to replace the wrong signal of the ink cartridge. SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink jet printer cartridge. Such an ink cartridge, in which the buoy in the detecting chamber is not stuck on the side wall of the detecting chamber, causes the ink capacity to be detected to be malfunctioning, and can correctly indicate the ink capacity in the ink storing chamber or the ink supply chamber communicating with the ink storing chamber. To achieve the above object, the inventors employed an ink jet printer cartridge having the following features. The utility model comprises an ink storage chamber for storing ink, an ink supply chamber communicating with the ink storage chamber and conveying the ink in the ink storage chamber to the ink supply chamber of the inkjet head, a detection chamber for detecting the ink inventory, and the detection chamber. In the range of 1. 00~: 1. 06g/cm 3 , the density of the buoy is in the range of 1. 00~: 1. 06g/cm 3 .至1. 03g/厘米3。 The inkjet printer cartridge, the density of the buoy may be 1. 02~1. 03g/cm 3 . In the above ink jet printer cartridge, the buoy is preferably a material obtained by mixing polypropylene with acrylonitrile-butadiene-styrene terpolymer in the following weight ratio, polypropylene: acrylonitrile-butadiene-styrene three Meta-copolymer = 2: 8. Preferably, the inkjet printer cartridge has a detection chamber located in the ink supply chamber and communicating with the ink supply chamber. Preferably, the inkjet printer cartridge has a detection chamber located in the ink reservoir and in communication with the ink reservoir. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an ink jet printer cartridge of the present invention; FIG. 2 is a perspective view of an ink jet printer cartridge of the present invention. Figure 3 is a schematic view showing the structure of an ink jet printer cartridge of the present invention; Figure 4 is a plan view of the ink jet printer cartridge of the present invention; Figure 5 is a cross-sectional view taken along line AA of Figure 4; The present invention will be further described below in conjunction with the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION Referring to Figures 1, 2, an ink jet printer cartridge of the present invention. In the drawing, the ink supply port 35 is located at the bottom of the ink cartridge 1 as a basis for drawing, and is the same as the normal use state of the ink cartridge. The ink cartridge 1 is composed of a cover 2 and a case 3. Both the cover 2 and the case 3 are made of plastic, and the two are connected by a hot melt or a vibration fuse into a closed body, and the inside forms a corresponding hollow chamber. The lid 2 is located at the top of the casing 3, that is, with respect to the portion where the ink supply port 35 is located. Referring to Figures 1, 4, and 5, the exposed portion of the lid 2 facing away from the lid 3 is provided with a handle 21 for facilitating the operator to hold and cooperate with the printer for spatial positioning of the cartridge, and an ink injecting hole 22 for filling the ink. In the state where the ink cartridge 1 is filled with ink, the ink filling hole 22 can be sealed by a plastic rubber stopper. Referring to Figures 3 and 5, an ink storage chamber 31 formed by a side wall and a corresponding inner partition is provided on the casing 3. It is used to hold and store ink. The air passage 32 communicates the ink storage chamber 31 with the outside atmosphere through a port located at the bottom of the casing 3 and a port located at a vertical portion of the ink storage chamber 31. The ink accommodated in the ink supply chamber 38 is supplied to the ink supply needle of the ink jet printer through the ink supply port 35. The ink supply chamber 38 is a chamber interposed between the ink storage chamber 31 and the ink supply port 35, and is in direct communication with the ink supply port 35, and communicates with the ink storage chamber 31 through the check valves 36, 37. The check valve 37 has an opening/closing control function for the ink passages of the ink storage chamber 31 and the ink supply chamber 38. When the pressure in the ink storage chamber 31 is greater than the ink supply chamber 38, the ink passage is opened; in the ink storage chamber 31. When the internal pressure is smaller than the ink supply chamber 38, the ink passage is closed. The check valve 36 is a pressure relief valve that releases the pressure in the ink supply chamber 38 to the ink storage chamber 31 when the pressure in the ink supply chamber 38 changes instantaneously and is larger than the ink storage chamber 31, and the control process is the same as that of the check valve 37. . Therefore, between the ink storage chamber 31 and the ink supply chamber 38, the opening directions of the check valve 37 and the check valve 36 are opposite to each other. At a higher liquid level position of the ink supply chamber 38, near a vertical side wall of the casing 3, a detection chamber 33 is provided and placed A buoy 34 in the detection chamber is used to detect the ink inventory in the ink cartridge 1. Referring to Figures 2, 3, and 5, the construction of the casing 3 will be described in detail. The detection chamber 33 is located at a higher liquid level position of the ink supply chamber 38, the bottom portion of which is in communication with the top of the ink supply chamber 38, and the top portion thereof is sealed by a film 331. The buoy 34 rises and falls in the detection chamber 33 as the ink level changes. The range of the range of 1. 00~1. 06g/cm 3 is preferably in the range of 1. 02~ 1. 03g/cm 3 . Generally, a buoy is prepared using a material obtained by mixing polypropylene with an acrylonitrile-butadiene-styrene terpolymer in the following weight ratio, and polypropylene: acrylonitrile-butadiene-styrene terpolymer = 2:8 . Before the ink cartridge 1 is used, the buoy 34 is suspended by the buoyancy of the ink and suspended in the ink solution stored in the detecting chamber 33. Because the density is slightly lower than the ink solution, the upper end surface or the plane and the ink liquid stored in the detecting chamber 33 are stored. The surface remains almost flush or slightly exposed to the ink level. For the convenience of manufacturing the ink cartridge, an opening is generally formed on the side of the detecting chamber 33 to be loaded into the buoy 34, and then the opening is closed with a film. For ease of monitoring, the casing 3 is made of a transparent or light transmissive material. Thus, in the case of visual inspection or use of a light sensor, it is convenient to monitor the liquid level of the ink in the ink cartridge. Of course, it is also possible to arrange the detection chamber 33 to communicate with the ink storage chamber 31 to monitor the ink in the ink storage chamber 31. The inlet of the air passage 32 is located at the bottom of the ink cartridge 1, the outlet is located at the top of the ink storage chamber 31, and an air guiding chamber 321 (see Fig. 2) is disposed at the entrance of the air passage 32, and a leakage preventing sponge 322 is placed in the air guiding chamber 321 and completely The air guiding chamber 321 is filled to prevent ink leakage. The air guiding chamber 321 is provided on the open end side wall of the lower portion with two air guiding grooves 3211 (see Fig. 2) for introducing the external atmosphere into the air guiding chamber 321 . The open port of the air guiding chamber 321 is sealed by a sealing film 323. The bottom of the ink cartridge 1 is further provided with another chamber 324 corresponding to the inlet of the air passage 32, the air guiding chamber 321 is located in the chamber 324, and the open end surface of the chamber 324 is sealed by a film 3241. After the film 323 seals the open port of the air guiding chamber 321, the two air guiding grooves 3211 are not affected to maintain the state of the external atmosphere and the air guiding chamber 321, and the leakage preventing sponge 322 can be pressed. The film 3241 completely separates the ink cartridge 1 from the outside air in the storage state. When the user uses the ink cartridge 1, only the film 3241 on the open end face of the chamber 324 is torn off, and the outside air passes through the air guiding groove 3211, and enters the ink storage chamber 31, so that the ink storage chamber 31 communicates with the outside air. An ink supply port 35 is provided at the bottom of the ink reservoir 31 at the end of the inlet of the air passage 32. Ink supply The inside of the 35 is provided with a sealing ring 351 whose opening port has a radial dimension matching the size of the printing needle bar of the ink jet printer, and the ink jet printer for receiving the ink is inserted into the ink supply port 35 through the sealing ring 351. The open end face of the ink supply port 35 is sealed by a film 352. A check valve 37 is provided in the ink connection passage of the ink storage chamber 31 to the ink supply chamber 38. The cylindrical wall of the check valve 37 is provided with a slit slit 371 extending in the axial direction thereof and penetrating the cylindrical wall. The check valve 37 opens/closes the aforementioned ink connection passage through the slit slit 371. Another independent one-way valve 36 is disposed between the ink storage chamber 31 and the ink supply chamber 38. The cylindrical wall of the one-way valve 36 is provided with a slit slit 361 extending in the axial direction and penetrating the cylindrical wall. When the ink supply needle is inserted into the ink supply port 35 to cause an increase in the ink pressure in the ink supply chamber 38, the check valve 36 is opened by the radial expansion force to open the slit slit 361, and the pressure increasing portion is released to the ink storage chamber 31. Internal, and exchange with the external atmosphere, to maintain balance. Therefore, the phenomenon of ink leakage at the ink supply port 35 when the ink jet printer cartridge is replaced is effectively avoided, and the phenomenon that the print head of the jet printer is damaged due to excessive ink pressure is effectively prevented. Both the one-way valve 37 and the one-way valve 36 are made of a resilient material such as rubber, and are shaped as a cylindrical cylinder sealed at one end. The open end of the cylindrical sleeve is sleeved on the corresponding connecting port of the ink cartridge, and the cylindrical wall is provided with slit slits 371 and 361 extending along the axial direction of the cylinder and penetrating through the cylindrical wall. In the state where there is no external force, or if the pressure in the cylinder is smaller than the pressure outside the cylinder, the slit slits 371 and 361 of the check valves 37 and 36 are naturally pressed by their opposite walls or are arched by their arches. Forming the extrusion to close, creating a closing effect, which prevents liquid from entering the cylindrical cavity through the slit gap from the outside of the cylinder. When the cylinder bore pressure is greater than the external pressure of the cylinder, the slit slits 371 and 361 of the check valves 37 and 36 expand due to the volume expansion of the medium in the cylinder bore, and the slit walls 371 and 361 are opposed to each other. The outside of the cylinder is opened, and the radial dimension of the slit slits 371 and 361 is enlarged to create a communication effect, so that the medium in the inner cavity of the cylinder flows to the outside of the cylinder. A groove is formed in the bottom of the ink storage chamber 31, and the communication tube 311 is formed by sealing the slot with a film. The ink in the ink reservoir 31 passes through the communication tube 311, enters the check valve 37, and the ink entering the check valve 37 enters the ink supply chamber 38 through the slit slit 371. When the ink in the ink storage chamber 31 and the check valve 37 is consumed, the air introduced by the air passage 32 enters the detection chamber 33 along the ink passage, and the ink in the detection chamber 33 enters. The lines are exchanged and the ink in the detection chamber 33 is then consumed. The ink in the detection chamber 33 enters the ink supply chamber 38 through the port at the bottom thereof and flows to the ink supply port 35. As the ink in the detection chamber 33 is consumed, the buoy 34 will gradually decrease with the ink level in the detection chamber 33. When the bottom of the buoy 34 is lowered to the lower chamber wall of the detection chamber 33, the detection light emitted by the printer is not detected. To the buoy 34, the ink is displayed. The bubbling of the inkjet printer according to the present invention, using a buoy having a specific gravity of 1. 04~1. 06g/cm 3 , using a buoy having a density in the range of 1. 00~1. 06g/cm 3 The specific gravity is matched with the ink solution or slightly lower than the ink, so that the buoyancy of the buoy as a whole in the ink solution is substantially the same as the gravity of its own, so that the buoy is suspended in the ink solution. Thus, even if air enters the ink cartridge detecting chamber, causing a state in which solid and liquid coexist, the buoy is always suspended in the ink solution, and rises and falls as the liquid level of the ink solution rises and falls. In addition to the exhaustion of the ink solution causing the detection chamber to dry out, the buoy does not adhere to the wall of the detection chamber due to the presence of a multi-phase state of matter, while maintaining a state of being always suspended in a single liquid phase of the ink solution. Thus, the buoy will remain in a relatively stable position in the detection chamber where the buoy blocks the detection light emitted by the ink jet printer and completes the detection of the ink capacity.