EP2716459A1 - Ink jet writing head with sealing element - Google Patents
Ink jet writing head with sealing element Download PDFInfo
- Publication number
- EP2716459A1 EP2716459A1 EP13180120.1A EP13180120A EP2716459A1 EP 2716459 A1 EP2716459 A1 EP 2716459A1 EP 13180120 A EP13180120 A EP 13180120A EP 2716459 A1 EP2716459 A1 EP 2716459A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- ink chamber
- spring ring
- recording head
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 91
- 239000000463 material Substances 0.000 claims description 22
- 238000007373 indentation Methods 0.000 claims description 12
- 230000004323 axial length Effects 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 3
- 239000000976 ink Substances 0.000 description 100
- 239000002904 solvent Substances 0.000 description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B41J2002/041—Electromagnetic transducer
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/05—Heads having a valve
Definitions
- Such ink-jet recording heads are used particularly in large-format heads used. Preferably, they are used in matrix printers. The state of the art is still on EP 0 445 137 B1 and DE 36 25 067 A1 pointed.
- a printhead of a matrix printer has a plurality of closely juxtaposed, closed by movable closing body expression openings or outlet openings.
- a matrix is understood to mean a two-dimensional or one-dimensional arrangement of a plurality of outlet openings.
- the ink-jet recording heads are used in particular as writing heads for labeling or marking devices, with which a label on objects, such as goods, which are located on a conveyor belt, or packages is applied.
- the outlet openings of the write head are released in the short term by lifting the closing body, so that ink under pressure can be brought to the surface to be printed.
- each closing body associated tension elements are actuated by means of the controllable pulling device such that the desired label is created on the surface to be printed.
- the ink in the ink chamber is under pressure, it is essential to provide pressure tight seals between the traction devices and the ink chamber.
- the ink is thus in contact with moving parts (pull rod). This is disadvantageous because ink often crystallizes out over time or components of the ink are precipitated or deposited. If not used for some time, the ink may also dry out. Mechanical movements can be influenced and possibly impaired by such deposits or by the dried out ink. In addition, an exchange of the Switzerlandstangdichtitch is possible only with relatively high effort.
- the in the DE 36 25 067 A1 are also outside the ink chamber, in which the ink chamber opposite end portion of guide tubes for the tension elements, here wire ropes, arranged.
- the sealing elements are arranged in the vicinity of the respective pulling devices and designed, for example, as compared to the pulling device dense bellows.
- the pressurized ink from the ink chamber rises through the guide tubes to the bellows executed seal.
- the traction cable to be moved is surrounded by ink, which is why caused here by crystallization or by other types of deposits caused adverse effects on the mechanically movable parts.
- the maintenance and repair, especially the replacement of the seals are also difficult and time consuming.
- the ink has a solvent.
- solvents Depending on the product to be printed different solvents are used. Typical extinguishing agents are water, ethanol, acetone, MEK, etc. Water is used, for example, in foods.
- the sealing elements now shrink or widen.
- the solvent has an influence on the material of the sealing element.
- a rubber-like material is used for the sealing elements, for example EPDM.
- Other materials are NBR, fluororubber or other suitable elastomers.
- the ink-jet recording head should have the highest possible technical life and the production and maintenance should be as simple and inexpensive as possible.
- the sealing element By the spring ring, the sealing element is active and constantly against the Ink chamber portion of the guide tube pressed. While previously, in the prior art, only the elastic effect of the material of the sealing element has been used, now presses the spring ring, the sealing element radially inwardly and presses it into abutment against the ink chamber portion of the guide tube. As a result, the seal is significantly improved. The seal is still guaranteed even if the material of the sealing element is softened by the solvent or expands. The function of the ink jet recording head is now essentially independent of the particular solvent used.
- the spring ring should have more than one turn. This is to be understood that the spring ring extends over more than 360 °. Preferably, it has 1.5 to 3.5 turns, in particular 2.5 turns. It thus revolves around the sealing element to at least 540 °, a rounding to 900 ° is preferred.
- the spring ring is preferably made of a round wire material, then the turns are next to each other. In another, preferred embodiment of the spring ring is made of flat, band-shaped material, then the turns are preferably one above the other.
- the spring ring engages around the sealing element in the region of the ink chamber portion of the guide tube from the outside. In other words, the sealing member is located between the spring ring and the ink chamber portion.
- the spring ring is in a range between 1/4 and 3/4 of the axial length of the ink chamber portion.
- the spring ring is arranged approximately on the longitudinal center of the ink chamber portion.
- annular, circumferential indentation in the outer jacket of the sealing element has been shown. It can also be called a groove or a throat. It is chosen so large that the spring washer is located inside the indentation. It does not protrude radially beyond the outer jacket of the sealing element. Overall, this does not contribute to the spring ring, he claimed over the previously known construction not extra space. This means that even old inkjet printheads after the EP 1 219 439 B1 can be converted to the present invention, so can be provided with a spring ring.
- the sealing members are disposed within the ink chamber and sealingly enclose the portions of the tension members protruding into the ink chamber, thereby preventing ink from contacting moving parts.
- the arrangement of the sealing elements within the ink chamber advantageously causes the ink pressure or with about 1 bar to about 10 bar, typically 0.25 to 0.5 bar, under pressure over standing ink sealingly acts on the sealing elements, since these against the guide tubes or pressed in the direction of the actuating openings.
- the pressure within the ink chamber with a constant or even increasing sealing effect of the sealing elements can also be significantly increased (for example, up to 10 bar).
- One of the reasons why a high pressure is preferable is that the types of inks used are often highly viscous liquids.
- the sealing elements with their spring ring are attached to the already built into the inkjet print head ink chamber sections of the guide tubes, so that replacement of defective sealing elements can be done quickly and easily.
- the spring rings can be applied to the already attached to the ink chamber sections sealing elements. It is advantageous if the front wall of the ink chamber is removable from the outside.
- the sealing elements fulfill three independent tasks.
- Each of the associated actuating opening facing portion causes the sealing of the ink chamber
- the underlying central region acts as a deformable bellows and the each of the associated outlet opening facing portion causes the closing function.
- the closing bodies are formed by the sealing elements themselves and because the sealing elements consist of an elastic, rubber-like material, the sealing of the outlet openings is reliably ensured and higher manufacturing tolerances can be accepted with regard to the length of the sealing elements.
- the ink chamber portion of the guide tube enclosing portion are integral.
- the sealing of the ink chamber against externally penetrating contaminants can additionally be improved by closing the sections of the guide tubes arranged outside the ink chamber with additional sealing means.
- sealing elements designed as capillary tubes can be pushed onto the protruding sections of the guide tubes, so that they tightly surround these and also the pull rod.
- Lubrication of the tension elements can additionally be achieved by additionally applying an oil to the openings of the guide tubes arranged outside the ink chamber.
- the inventive ink jet recording head has an extremely low susceptibility to interference, since the sealing of the sealing elements with respect to the ink chamber sections and the mechanical support of the sealing elements on the ink chamber sections are now significantly improved.
- the ink chamber is sealed against external contamination.
- the ink can not reach the area of the moving parts.
- the inkjet printhead is very small in size and is quick and efficient to service and repair since the sealing elements can be easily replaced after the ink chamber has been previously opened.
- An ink jet recording head 1 has an ink chamber 4 arranged in a housing 2.
- the substantially cubic ink chamber 4 is bounded by a front wall 6, side walls 8 and a rear wall 10.
- the front wall 6 is preferably detachably connected to the housing 2 and sealed by a preferably formed as an O-ring 12 seal.
- outlet openings 14 are arranged, which act as a nozzle for exiting during the printing process ink 16.
- the term ink 16 means all suitable for labeling and marking substances such as paints, acids, etc.
- the area surrounding the outlet openings 14 is curved in the direction of the ink chamber 4, wherein the outlet openings 14 are arranged in the center of the curvature 18.
- the vault 18 has a twofold beneficial effect.
- the outlet openings 14 are extended in the direction of their longitudinal axes XX, whereby a better management of the exiting ink drops is achieved, which in turn requires a more accurate printed image.
- bulges 18 lead to a better sealing of the outlet openings 14 through
- the discharge openings 14 abutting closing body 20.
- the voltage applied to the outlet openings 14 surfaces of the closing body 20 are designed substantially flat. In principle, the voltage applied to the outlet openings 14 surfaces of the closing body 20 may also be curved. It is also possible both bearing surfaces, the closing body 20 and the area around the outlet openings 14) to execute plan.
- Each closing body 20 is a tension element 22, preferably associated with a pull rod which extends coaxially to the longitudinal axis X-X of the respective outlet opening 14.
- the tension elements 22 extend through actuating openings 24 arranged in the rear wall 10 and are connected to pulling devices (not shown).
- the tension elements 22 may have a diameter of, for example, 1 to 1.2 mm and be designed as hollow pull tubes, in order thus to achieve a material and thus a weight reduction.
- pulling devices in particular electromagnets are suitable, which accomplish a stroke of the closing body 20 of, for example, about 0.2 mm.
- guide tubes 26 extending coaxially with the tension elements 22 are arranged in the actuation openings 24 and have both an ink chamber section 28 protruding into the ink chamber 4 and an outer section 30 protruding outside the ink chamber 4 opposite the housing 2.
- the tension elements 22 are guided in the guide tubes 26.
- the ink 16 passes through a bore 32 from an ink tank, not shown, the terminal end 34 is connected to the arranged in one of the side walls 8 bore 32, under pressure into the ink chamber. 4
- the actuating openings 24 are each sealed off from the ink 16 in the ink chamber 4 by a sealing element 36.
- the sealing elements 36 enclose the regions of the tension elements 22 projecting into the ink chamber 4.
- the sealing elements 36 not only surround the tension elements 22 but also the ink chamber sections 28 of the guide tubes 26, thus sealing the actuating openings 24 securely.
- the sealing elements 36 can be easily pushed onto the tension elements 22 and ink chamber sections 28.
- the tension elements 22 in their outlet openings 14 facing end regions each have an annular, transversely to the longitudinal axis X-X extending groove 38 in which the respective sealing member 36 comes to rest.
- a particular advantage of the embodiment of the sealing elements 36 according to the invention lies in the fact that they themselves act directly as a closing body 20, since the sealing elements 36 consisting of an elastic rubber-like material rest against the outlet openings 14. Additional closing body elements omitted.
- FIG. 1 shows a first embodiment of the sealing element according to the invention 36.
- This is designed substantially cylindrical and has a thinned wall portion 40 in the middle.
- This wall section 40 facilitates the deformation of the sealing element 36 when the pulling device is actuated or when the closing element 20 is lifted off the outlet opening 14 for a short time.
- the wall section 40 can then preferably deform inwards.
- FIG. 2 shows an advantageous further embodiment variant of the sealing element according to the invention 36.
- This has starting from the voltage applied to the outlet opening 14 a frustoconical portion 42 which merges into a substantially cylindrical portion 44.
- the execution of the truncated cone-like portion 42 results in that the pressurized ink is directed towards the outlet opening 14.
- the overpressure in the ink chamber is for example 1 bar, whereby turbulences of the ink 16 are minimized.
- a constriction 46 instead of in Fig. 1 has shown diluted wall portion 40.
- the constriction 46 causes, upon actuation of the tension elements 22, a defined widening of the area of the sealing element 36 that is limited by the constriction 46 and that of the actuating opening 24.
- the technical life of the inkjet recording head 1 can be further extended by the fact that penetration of dirt particles or deposits through the actuating openings 24 in the region of the tension elements 22 is avoided by closing means.
- This can essentially be achieved by additionally closing the outer sections 30 of the guide tubes 26 with sealing means 50.
- These are advantageously tubular and consist of an elastic material, preferably the material from which the sealing elements 36 are made.
- the sealing means 50 in particular capillary tubes, are pushed onto the tension elements 22 or onto the outer sections of the guide tubes 26 and enclose them. Due to their elasticity, the sealing means 50 do not hinder the movement of the tension elements 22.
- actuating openings 24 and the corresponding ends of the guide tubes 26 are acted upon by an oil 48 in order to achieve a lubrication of the tension elements 20.
- the sealing element 36 is encompassed in its upper region, namely in the region which is located radially outside of the ink chamber portion 28 of the associated guide tube 26, by a spring ring 60.
- a spring ring 60 This is in the two embodiments of the FIGS. 1 and 3 each made of a round wire, which has several turns. The turns are axially adjacent. Formed is a cylindrical Spring, also called coil spring.
- the ink chamber portion 28 extends in the axial direction over a length L.
- the two versions after the FIGS. 1 and 3 differ in that the sealing element 36 after Fig. 3 an annular indentation 62, that after Fig. 1 but not.
- the indentation 62 is located approximately at the longitudinal center of the ink chamber section 28 in the assembled state of the sealing element 36.
- the radial depth of the indentation 62 is selected to be greater than the radial thickness of the spring ring 60, in particular as the diameter of the wire from which the spring ring 60 is made.
- the indentation 62 has a U-shape in cross-section, with the inner corners being rounded. It can be seen that the material thickness of the sealing element 36 in the region of the indentation 62 is reduced to a maximum of 50% of the material thickness in the axially immediately adjacent region. A reduction beyond 50% is possible.
- the axial length of the indentation 62 is 10 to 50% greater than the axial length of the spring ring 60th
- the ends of the spring ring 60 are rounded or slightly bent away to the outside, so that the ends can not dig into the material of the sealing element 36.
- the spring ring 60 should not mechanically injure the sealing element 36.
- a spring ring 60 is inserted, which has superposed turns. It is made of a flat, band-shaped spring material. The width of the material determines the axial extent of the spring ring 60. There are several turns one above the other, there are about 2.5 turns provided. Again, it is recommended that the edges and in particular the inner end of the spring ring 60 to edit, in particular deburring that the spring ring 60 does not cut into the material of the sealing element 36 and can injure the sealing material. Again shows Fig. 4 a dent 62 as in Fig. 3 , the Fig. 2 shows like that Fig. 1 no such indentation.
- the discussed parts in particular the sealing element 36 and the spring ring 60, are relatively small.
- the outer diameter of both lies in the range between 1 and 3 mm.
- wire for example, wire with a diameter of 0.1 to 0.3 mm, in particular 0.15 mm is used.
- the spring washers made of band-shaped material FIG. 2 or FIG. 4 a cross section of the strip material of 0.01 to 0.08 mm thickness and 0.5 to 1 mm axial length is used.
- sealing means are respectively arranged between the outer sections of the guide tubes and the tension elements, which sealingly surround both the outer sections and the pull rod.
- Closing means are preferably arranged on the ends of the actuating openings facing away from the ink chamber.
Landscapes
- Ink Jet (AREA)
Abstract
Description
Die Erfindung betrifft einen Tintenstrahl-Schreibkopf mit
- a) einer in einem Gehäuse angeordneten, mit Tinte unter Überdruck befüllbaren Tintenkammer, in der in einer Frontwand Austrittsöffnungen angeordnet sind,
- b) jeweils an einer Innenseite der Frontwand anliegenden und jeweils eine Austrittsöffnung verschließende, in einer Längsrichtung der zugehörigen Austrittsöffnungen bewegbaren Schließkörpern,
- c) Zugelementen, die jeweils mit einem Schließkörper verbunden sind und sich koaxial zur Längsrichtung der jeweils zugeordneten Austrittsöffnung und jeweils durch eine in einer Rückwand der Tintenkammer angeordnete Betätigungsöffnung hindurch erstrecken,
- d) Führungsrohren, in denen die Zugelemente zumindest teilweise geführt sind,
- e) Zugvorrichtungen, die jeweils mit einem der Zugelemente an seinem der Tintenkammer abgewandten Ende verbunden sind, und
- f) Dichtungselementen, die jeweils eine Zugvorrichtung gegenüber der Tintenkammer derart abdichten, dass ein Kontakt der Tinte mit der Zugvorrichtung verhindert wird,
- a) a arranged in a housing, can be filled with ink under pressure over-pressure ink chamber in which are arranged in a front wall outlet openings,
- b) in each case adjacent to an inner side of the front wall and in each case an outlet opening closing, in a longitudinal direction of the associated outlet openings movable closing bodies,
- c) tension members which are each connected to a closing body and extend coaxially to the longitudinal direction of the respectively associated outlet opening and in each case through an actuating opening arranged in a rear wall of the ink chamber,
- d) guide tubes in which the tension elements are at least partially guided,
- e) traction devices which are each connected to one of the tension elements at its end facing away from the ink chamber, and
- f) sealing elements each sealing a pulling device with respect to the ink chamber such that contact of the ink with the pulling device is prevented,
Derartige Tintenstrahl-Schreibköpfe werden insbesondere in Großschriftköpfen eingesetzt. Vorzugsweise werden sie in Matrixdruckern verwendet. Zum Stand der Technik wird noch auf
Ein Druckkopf eines Matrixdruckers hat eine Vielzahl eng nebeneinander liegender, durch bewegbare Schließkörper verschlossener Ausdrucköffnungen bzw. Austrittsöffnungen. Unter einer Matrix wird eine zweidimensionale oder eine eindimensionale Anordnung von mehreren Austrittsöffnungen verstanden.A printhead of a matrix printer has a plurality of closely juxtaposed, closed by movable closing body expression openings or outlet openings. A matrix is understood to mean a two-dimensional or one-dimensional arrangement of a plurality of outlet openings.
Die Tintenstrahl-Schreibköpfe werden insbesondere als Schreibköpfe für Beschriftungs- oder Signiergeräte eingesetzt, mit denen eine Beschriftung auf Gegenstände, beispielsweise Waren, die sich auf einem Fließband befinden, oder Packungen aufgebracht wird. Dabei werden die Austrittsöffnungen des Schreibkopfes kurzfristig durch Abheben der Schließkörper freigegeben, sodass unter Überdruck stehende Tinte auf die zu bedruckende Fläche gebracht werden kann. Hierfür werden jedem Schließkörper zugeordnete Zugelemente mittels der steuerbaren Zugvorrichtung derart betätigt, dass auf der zu bedruckenden Fläche die gewünschte Beschriftung entsteht.The ink-jet recording heads are used in particular as writing heads for labeling or marking devices, with which a label on objects, such as goods, which are located on a conveyor belt, or packages is applied. In this case, the outlet openings of the write head are released in the short term by lifting the closing body, so that ink under pressure can be brought to the surface to be printed. For this purpose, each closing body associated tension elements are actuated by means of the controllable pulling device such that the desired label is created on the surface to be printed.
Für ein ansprechendes bzw. exaktes Druckbild ist Voraussetzung, dass die einzelnen Austrittsöffnungen mit minimalem Abstand zueinander angeordnet sind. Dies wird dadurch erschwert, dass die Zugvorrichtungen, üblicherweise Elektromagnete, größere Abmessungen aufweisen und nicht so dicht wie die Austrittsöffnungen nebeneinander angeordnet werden können. Deshalb sind zwischen den Schließkörpern und den zugeordneten Zugvorrichtungen Zugelemente von derartiger Länge angeordnet, dass die Zugvorrichtungen aufgefächert nebeneinander angeordnet sein können. Die Antriebsbewegungen der Zugvorrichtungen werden über die Zugelemente auf die Schließkörper übertragen, wobei die Zugelemente beispielsweise als Zugseile bzw. Drähte oder auch als Zugstangen ausgeführt sein können.For an attractive or exact print image is a prerequisite that the individual outlet openings are arranged with minimal distance from each other. This is made more difficult because the traction devices, usually electromagnets, have larger dimensions and can not be arranged as close as the outlet openings side by side. Therefore, tension members of such a length are arranged between the closing bodies and the associated traction devices that the traction devices can be arranged in fanned out side by side. The drive movements of the traction devices are transmitted via the tension elements on the closing body, wherein the tension elements can be designed for example as tension cables or wires or as tie rods.
Da die Tinte in der Tintenkammer unter Ãœberdruck steht, ist es unbedingt notwendig zwischen den Zugvorrichtungen und der Tintenkammer druckdichte Abdichtungen vorzusehen.Since the ink in the ink chamber is under pressure, it is essential to provide pressure tight seals between the traction devices and the ink chamber.
In der
Die in der
Aus der
Bei dem praktischen Betrieb des Tintenstrahl-Schreibkopfes nach der
Hier setzt nun die Erfindung ein. Sie hat es sich zur Aufgabe gemacht, den Einfluss unterschiedlicher Lösungsmittel auf die Funktion der Dichtungselemente zu verringern, die Dichtigkeit zwischen Dichtungselement und Tintenkammerabschnitt zu verbessern und dauerhafter als bisher zu gestalten und sicherzustellen, dass sich beim praktischen Betrieb das Dichtungselement möglichst nicht entlang des Tintenkammerabschnitts bewegt.This is where the invention begins. It has set itself the task of reducing the influence of different solvents on the function of the sealing elements to improve the tightness between the sealing element and the ink chamber portion and make it more durable than before and to ensure that the sealing element does not move in practical operation as possible along the ink chamber portion ,
Der Tintenstrahl-Schreibkopf soll eine möglichst hohe technische Lebensdauer aufweisen und die Herstellung und Wartung möglichst einfach und kostengünstig durchführbar sein.The ink-jet recording head should have the highest possible technical life and the production and maintenance should be as simple and inexpensive as possible.
Diese Aufgabe wird gelöst durch die Merkmale des Anspruchs 1.This object is achieved by the features of claim 1.
Durch den Federring wird das Dichtungselement aktiv und ständig gegen den Tintenkammerabschnitt des Führungsrohres gepresst. Während zuvor, beim Stand der Technik, lediglich die elastische Wirkung des Materials des Dichtungselementes genutzt wurde, drückt nun der Federring das Dichtungselement zusätzlich radial nach innen und presst ihn in Anlage an den Tintenkammerabschnitt des Führungsrohres. Dadurch wird die Abdichtung deutlich verbessert. Die Abdichtung ist auch dann noch gewährleistet, wenn das Material des Dichtungselementes durch das Lösungsmittel aufgeweicht ist bzw. sich ausweitet. Die Funktion des Tintenstrahl-Schreibkopfs ist nunmehr im Wesentlichen unabhängig vom jeweils verwendeten Lösungsmittel.By the spring ring, the sealing element is active and constantly against the Ink chamber portion of the guide tube pressed. While previously, in the prior art, only the elastic effect of the material of the sealing element has been used, now presses the spring ring, the sealing element radially inwardly and presses it into abutment against the ink chamber portion of the guide tube. As a result, the seal is significantly improved. The seal is still guaranteed even if the material of the sealing element is softened by the solvent or expands. The function of the ink jet recording head is now essentially independent of the particular solvent used.
Der Federring soll mehr als eine Windung aufweisen. Hierunter ist zu verstehen, dass der Federring sich über mehr als 360° erstreckt. Vorzugsweise hat er 1,5 bis 3,5 Windungen, insbesondere 2,5 Windungen. Er umläuft das Dichtungselement also auf mindestens 540°, eine Umrundung auf 900° ist bevorzugt. Der Federring ist vorzugsweise aus einem runden Drahtmaterial hergestellt, dann liegen die Windungen nebeneinander. In einer anderen, bevorzugten Ausführung ist der Federring aus flachem, bandförmigem Material hergestellt, dann liegen die Windungen vorzugsweise übereinander. Der Federring umgreift das Dichtungselement im Bereich des Tintenkammerabschnittes des Führungsrohrs von außen. Anders ausgedrückt befindet sich das Dichtungselement zwischen dem Federring und dem Tintenkammerabschnitt.The spring ring should have more than one turn. This is to be understood that the spring ring extends over more than 360 °. Preferably, it has 1.5 to 3.5 turns, in particular 2.5 turns. It thus revolves around the sealing element to at least 540 °, a rounding to 900 ° is preferred. The spring ring is preferably made of a round wire material, then the turns are next to each other. In another, preferred embodiment of the spring ring is made of flat, band-shaped material, then the turns are preferably one above the other. The spring ring engages around the sealing element in the region of the ink chamber portion of the guide tube from the outside. In other words, the sealing member is located between the spring ring and the ink chamber portion.
Vorzugsweise befindet sich der Federring in einem Bereich zwischen 1/4 und 3/4 der axialen Länge des Tintenkammerabschnittes. Insbesondere wird der Federring etwa auf der Längsmitte des Tintenkammerabschnittes angeordnet.Preferably, the spring ring is in a range between 1/4 and 3/4 of the axial length of the ink chamber portion. In particular, the spring ring is arranged approximately on the longitudinal center of the ink chamber portion.
Als vorteilhaft hat sich eine ringförmige, umlaufende Einbuchtung im Außenmantel des Dichtungselementes gezeigt. Sie kann auch als Nut oder Kehle bezeichnet werden. Sie ist so groß gewählt, dass sich der Federring innerhalb der Einbuchtung befindet. Er ragt damit nicht radial über den Außenmantel des Dichtungselementes hinaus. Insgesamt trägt der Federring dadurch nicht auf, er beansprucht gegenüber der vorbekannten Konstruktion nicht zusätzlichen Platz. Dies bedeutet, dass auch alte Tintenstrahl-Schreibköpfe nach der
Nach wie vor sind die Dichtungselemente innerhalb der Tintenkammer angeordnet und umschließen die in die Tintenkammer hineinragenden Bereiche der Zugelemente dichtend, dadurch wird verhindert, dass Tinte mit beweglichen Teilen in Berührung kommt.
Die Anordnung der Dichtungselemente innerhalb der Tintenkammer bewirkt vorteilhafterweise, dass der Tintendruck bzw. die mit etwa 1 bar bis etwa 10 bar, typisch sind 0,25 bis 0,5 bar, unter Überdruck stehende Tinte, dichtend auf die Dichtungselemente einwirkt, da diese gegen die Führungsrohre bzw. in Richtung der Betätigungsöffnungen gedrückt werden. Somit kann im Gegensatz zu den bekannten Ausführungsformen der Druck innerhalb der Tintenkammer bei gleichbleibender bzw. sogar steigender Dichtwirkung der Dichtungselemente auch deutlich erhöht werden (beispielsweise bei bis zu 10 bar). Ein hoher Druck ist unter anderem auch deshalb zu bevorzugen, da es sich bei den eingesetzten Tintenarten oftmals um hochviskose Flüssigkeiten handelt.As before, the sealing members are disposed within the ink chamber and sealingly enclose the portions of the tension members protruding into the ink chamber, thereby preventing ink from contacting moving parts.
The arrangement of the sealing elements within the ink chamber advantageously causes the ink pressure or with about 1 bar to about 10 bar, typically 0.25 to 0.5 bar, under pressure over standing ink sealingly acts on the sealing elements, since these against the guide tubes or pressed in the direction of the actuating openings. Thus, in contrast to the known embodiments, the pressure within the ink chamber with a constant or even increasing sealing effect of the sealing elements can also be significantly increased (for example, up to 10 bar). One of the reasons why a high pressure is preferable is that the types of inks used are often highly viscous liquids.
Die Dichtungselemente mit ihrem Federring werden auf die bereits in den Tintenstrahl-Schreibkopf eingebauten Tintenkammerabschnitten der Führungsrohre aufgesteckt, sodass ein Austausch defekter Dichtungselemente schnell und einfach erfolgen kann. Alternativ können auch die Federringe auf die bereits auf die Tintenkammerabschnitte aufgesteckten Dichtungselemente aufgebracht werden. Vorteilhaft ist es, wenn die Frontwand der Tintenkammer von außen entfernbar ist.The sealing elements with their spring ring are attached to the already built into the inkjet print head ink chamber sections of the guide tubes, so that replacement of defective sealing elements can be done quickly and easily. Alternatively, the spring rings can be applied to the already attached to the ink chamber sections sealing elements. It is advantageous if the front wall of the ink chamber is removable from the outside.
Prinzipiell erfüllen die Dichtungselemente drei voneinander unabhängige Aufgaben. Der jeweils der zugehörigen Betätigungsöffnung zugewandte Abschnitt bewirkt die Abdichtung der Tintenkammer, der darunter befindliche Mittelbereich wirkt als deformierbarer Balg und der der jeweils der zugehörigen Austrittsöffnung zugewandte Abschnitt bewirkt die Schließfunktion. Dadurch, dass die Schließkörper durch die Dichtungselemente selbst gebildet sind und weil die Dichtungselemente aus einem elastischen, gummiartigen Material bestehen, ist die Abdichtung der Austrittsöffnungen sicher gewährleistet und es können bezüglich der Länge der Dichtungselemente höhere Fertigungstoleranzen in Kauf genommen werden. Für eine vollständige Abdichtung der Tintenkammer gegenüber den Betätigungsöffnungen genügen aufgrund der sackartigen Ausbildung der Dichtungselemente lediglich der dichtende, den Tintenkammerabschnitt des Führungsrohrs umschließende Abschnitt. Die Dichtungselemente sind einstückig.In principle, the sealing elements fulfill three independent tasks. Each of the associated actuating opening facing portion causes the sealing of the ink chamber, the underlying central region acts as a deformable bellows and the each of the associated outlet opening facing portion causes the closing function. Because the closing bodies are formed by the sealing elements themselves and because the sealing elements consist of an elastic, rubber-like material, the sealing of the outlet openings is reliably ensured and higher manufacturing tolerances can be accepted with regard to the length of the sealing elements. For a complete seal of the ink chamber with respect to the actuating openings satisfy due to the bag-like formation of the Sealing members only the sealing, the ink chamber portion of the guide tube enclosing portion. The sealing elements are integral.
Weiterhin hat sich gezeigt, dass es vorteilhaft ist, wenn die Führungsrohre auch außerhalb der Tintenkammer gegenüber der Rückwand vorstehen. Der vorstehende Abschnitt bietet den Vorteil, dass die unweigerlich außerhalb der Tintenkammer entstehenden Verschmutzungen und Ablagerungen, die sich bevorzugt an der Rückwand ablagern, nur erschwert in die Betätigungsöffnungen eindringen können.Furthermore, it has been shown that it is advantageous if the guide tubes also protrude outside the ink chamber with respect to the rear wall. The above section has the advantage that the dirt and deposits which inevitably arise outside the ink chamber and which preferably deposit on the rear wall are difficult to penetrate into the actuating openings.
Die Abdichtung der Tintenkammer gegenüber von außen eindringenden Verschmutzungen kann zusätzlich dadurch verbessert werden, dass die außerhalb der Tintenkammer angeordneten Abschnitte der Führungsrohre mit zusätzlichen Dichtmitteln verschlossen werden. Beispielsweise können als Kapillarschläuche ausgeführte Dichtungselemente auf die vorstehenden Abschnitte der Führungsrohre aufgeschoben werden, sodass sie diese und auch die Zugstange fest umschließen.The sealing of the ink chamber against externally penetrating contaminants can additionally be improved by closing the sections of the guide tubes arranged outside the ink chamber with additional sealing means. For example, sealing elements designed as capillary tubes can be pushed onto the protruding sections of the guide tubes, so that they tightly surround these and also the pull rod.
Eine Schmierung der Zugelemente kann zusätzlich dadurch erreicht werden, dass die außerhalb der Tintenkammer angeordneten Öffnungen der Führungsrohre zusätzlich mit einem Öl beaufschlagt werden.Lubrication of the tension elements can additionally be achieved by additionally applying an oil to the openings of the guide tubes arranged outside the ink chamber.
Der erfindungsemäße Tintenstrahl-Schreibkopf weist eine äußerst geringe Störanfälligkeit auf, da die Abdichtung der Dichtelemente gegenüber den Tintenkammerabschnitten und der mechanische Halt der Dichtelemente an den Tintenkammerabschnitten nun deutlich verbessert sind. Die Tintenkammer ist gegen äußere Verschmutzungen abgedichtet. Es kann die Tinte nicht in den Bereich der beweglichen Teile gelangen. Der Tintenstrahl-Schreibkopf baut sehr klein und ist schnell und effizient zu warten und zu reparieren, da die Dichtungselemente nach voriger Öffnung der Tintenkammer problemlos ausgetauscht werden können.The inventive ink jet recording head has an extremely low susceptibility to interference, since the sealing of the sealing elements with respect to the ink chamber sections and the mechanical support of the sealing elements on the ink chamber sections are now significantly improved. The ink chamber is sealed against external contamination. The ink can not reach the area of the moving parts. The inkjet printhead is very small in size and is quick and efficient to service and repair since the sealing elements can be easily replaced after the ink chamber has been previously opened.
Weitere vorteilhafte Ausgestaltungsmerkmale des erfindungsgemäßen Gegenstandes sind in der Figurenbeschreibung und in den Unteransprüchen enthalten. Anhand der nachfolgenden Figuren wird die Erfindung näher erläutert. Die gezeigten Ausführungsbeispiele sind dabei nicht einschränkend zu verstehen. Es zeigen:
- Fig. 1:
- eine Ausschnittsvergrößerung eines erfindungsgemäßen TintenstrahlSchreibkopfes im Schnitt, wobei der Übersicht halber die Systemkomponenten Zugstange, Führungsrohr und Dichtungselement nur einmal dargestellt sind,
- Fig. 2:
- eine Ausschnittsvergrößerung einer weiteren Ausführungsvariante des erfindungsemäßen Tintenstrahl-Schreibkopfes im Schnitt gemäß
Fig. 1 , - Fig. 3:
- ein axiales Schnittbild durch eine Anordnung aus einem Dichtungselement und einem Federring, wobei der Federring mehrere, radial übereinander liegende Windungen aufweist, und
- Fig. 4:
- eine vergrößerte Darstellung eines Dichtungselementes und eines Federrings, wie
Fig. 3 .
- Fig. 1:
- an enlarged detail of an ink jet recording head according to the invention in section, wherein the sake of clarity, the system components tie rod, guide tube and sealing element are shown only once,
- Fig. 2:
- an enlarged detail of another embodiment of the inventive ink jet recording head in section according to
Fig. 1 . - 3:
- an axial sectional view through an arrangement of a sealing element and a spring ring, wherein the spring ring has a plurality of radially superimposed turns, and
- 4:
- an enlarged view of a sealing element and a spring ring, such as
Fig. 3 ,
Ein erfindungsgemäßer Tintenstrahl-Schreibkopf 1 weist eine in einem Gehäuse 2 angeordnete Tintenkammer 4 auf. Die im Wesentlichen kubische Tintenkammer 4 ist durch eine Frontwand 6, Seitenwände 8 und eine Rückwand 10 begrenzt. Die Frontwand 6 ist vorzugsweise lösbar mit dem Gehäuse 2 verbunden und über eine vorzugsweise als O-Ring 12 ausgebildete Dichtung abgedichtet. In der Frontwand 6 sind Austrittsöffnungen 14 angeordnet, die als Düse für während des Druckprozesses austretende Tinte 16 wirken. Der Begriff Tinte 16 meint sämtliche zur Beschriftung und Markierung geeigneten Stoffe wie beispielsweise auch Lacke, Säuren u.s.w.. Der die Austrittsöffnungen 14 umgebende Bereich ist in Richtung der Tintenkammer 4 gewölbt ausgeführt, wobei die Austrittsöffnungen 14 im Zentrum der Wölbung 18 angeordnet sind. Die Wölbung 18 hat eine zweifache vorteilhafte Wirkung. Zum einen werden die Austrittsöffnungen 14 in Richtung ihrer Längsachsen X-X verlängert, wodurch eine bessere Führung der austretenden Tintentropfen erreicht wird, was wiederum ein exakteres Druckbild bedingt. Zum anderen führen die in Richtung der Tintenkammer 4 gerichteten Wölbungen 18 zu einer besseren Abdichtung der Austrittsöffnungen 14 durch an den Austrittsöffnungen 14 anliegende Schließkörper 20. Die an den Austrittsöffnungen 14 anliegenden Flächen der Schließkörper 20 sind im Wesentlichen plan ausgeführt. Grundsätzlich können die an den Austrittsöffnungen 14 anliegenden Flächen der Schließkörper 20 ebenfalls gewölbt ausgeführt sein. Auch ist es möglich beide Anlageflächen, die der Schließkörper 20 und den Bereich um die Austrittsöffnungen 14), plan auszuführen.An ink jet recording head 1 according to the invention has an
Jedem Schließkörper 20 ist ein Zugelement 22, vorzugsweise eine Zugstange zugeordnet, die koaxial zur Längsachse X-X der jeweiligen Austrittsöffnung 14 verläuft. Anstelle von Zugstangen ist es auch möglich, Zugseile oder ähnliche Zugelemente zu verwenden. Die Zugelemente 22 erstrecken sich durch in der Rückwand 10 angeordnete Betätigungsöffnungen 24 hindurch und sind mit nicht dargestellten Zugvorrichtungen verbunden. Vorteilhafterweise können die Zugelemente 22 einen Durchmesser von beispielsweise 1 bis 1,2 mm aufweisen und als hohle Zugröhrchen ausgeführt sein, um somit eine Material- und damit eine Gewichtsreduzierung zu erreichen. Als Zugvorrichtungen sind insbesondere Elektromagnete geeignet, die einen Hub der Schließkörper 20 von beispielsweise etwa 0,2 mm bewerkstelligen.Each closing body 20 is a
Erfindungsgemäß sind in den Betätigungsöffnungen 24 koaxial zu den Zugelementen 22 verlaufende Führungsrohre 26 angeordnet, die sowohl einen in die Tintenkammer 4 hineinragenden Tintenkammerabschnitt 28 und einen außerhalb der Tintenkammer 4 gegenüber dem Gehäuse 2 vorstehenden Außenabschnitt 30 aufweisen. Die Zugelemente 22 sind in den Führungsrohren 26 geführt. Die Tinte 16 gelangt über eine Bohrung 32 aus einem nicht dargestellten Tintenbehälter, dessen Anschlussende 34 mit der in einer der Seitenwände 8 angeordneten Bohrung 32 verbunden ist, unter Überdruck in die Tintenkammer 4.According to the invention, guide
Erfindungsgemäß sind die Betätigungsöffnungen 24 gegenüber der in der Tintenkammer 4 befindlichen Tinte 16 jeweils durch ein Dichtungselement 36 abgedichtet. Vorteilhafterweise umschließen die Dichtungselemente 36 die in die Tintenkammer 4 hineinragenden Bereiche der Zugelemente 22. In der dargestellten Ausführungsvariante umschließen die Dichtungselemente 36 nicht nur die Zugelemente 22, sondern auch die Tintenkammerabschnitte 28 der Führungsrohre 26, und dichten somit die Betätigungsöffnungen 24 sicher ab.According to the invention, the actuating
Vorteilhafterweise können die Dichtungselemente 36 problemlos auf die Zugelemente 22 und Tintenkammerabschnitte 28 aufgeschoben werden. Um einen sicheren Sitz auf den Zugelementen 22 bzw. den Führungsrohren 26 zu gewährleisten, weisen die Zugelemente 22 in ihren den Austrittsöffnungen 14 zugewandten Endbereichen jeweils eine ringförmige, quer zur Längsachse X-X verlaufende Nut 38 auf, in der das jeweilige Dichtungselement 36 zur Anlage kommt.Advantageously, the sealing
Ein besonderer Vorteil der erfindungsgemäßen Ausführung der Dichtungselemente 36 liegt darin, dass diese selbst unmittelbar als Schließkörper 20 wirken, da die aus einem elastischen gummiartigen Material bestehenden Dichtungselemente 36 an den Austrittsöffnungen 14 anliegen. Zusätzliche Schließkörperelemente entfallen.A particular advantage of the embodiment of the sealing
Aufgrund der verschiedenen Anforderungen an die Tinte 16 sind auch die für die Herstellung der Dichtungselemente 36 in Frage kommenden Materialarten entsprechend anzupassen.Because of the different requirements for the
Weiterhin hat sich auch als vorteilhaft erwiesen, wenn das Dichtungselement 36 im Bereich zwischen der Austrittsöffnung 14 und nahe dem Ende des Tintenkammerabschnitts 28 des Führungsrohres 26 eine Einschnürung 46 anstelle des in
Die technische Lebensdauer des Tintenstrahl-Schreibkopfes 1 kann zusätzlich dadurch verlängert werden, dass ein Eindringen von Schmutzpartikeln oder Ablagerungen durch die Betätigungsöffnungen 24 in den Bereich der Zugelemente 22 durch Schließmittel vermieden wird. Dies kann im Wesentlichen dadurch erreicht werden, dass die Außenabschnitte 30 der Führungsrohre 26 zusätzlich mit Dichtungsmitteln 50 verschlossen werden. Diese sind vorteilhafterweise schlauchartig und bestehen aus einem elastischen Material, vorzugsweise dem Material, aus dem auch die Dichtungselemente 36 gefertigt sind. Die Dichtungsmittel 50, insbesondere Kapillarschläuche, werden auf die Zugelemente 22 bzw. auf die Außenabschnitte der Führungsrohre 26 aufgeschoben und umschließen diese. Aufgrund ihrer Elastizität behindern die Dichtungsmittel 50 die Bewegung der Zugelemente 22 nicht.The technical life of the inkjet recording head 1 can be further extended by the fact that penetration of dirt particles or deposits through the
Weiterhin sind die Betätigungsöffnungen 24 bzw. die entsprechenden Enden der Führungsrohre 26 mit einem Öl 48 beaufschlagt, um eine Schmierung der Zugelemente 20 zu erreichen.Furthermore, the actuating
Wie in
Die beiden Ausführungen nach den
Die axiale Länge der Einbuchtung 62 ist um 10 bis 50% größer als die axiale Länge des Federrings 60.The axial length of the
Vorzugsweise sind die Enden des Federrings 60 abgerundet oder etwas nach außen weggebogen, so dass die Enden sich nicht in das Material des Dichtungselementes 36 eingraben können. Der Federring 60 soll das Dichtungselement 36 nicht mechanisch verletzen.Preferably, the ends of the
Die beiden Ausführungen nach den
In der praktischen Realisierung sind die besprochenen Teile, insbesondere das Dichtungselement 36 und der Federring 60, relativ klein. Der Außendurchmesser beider liegt im Bereich zwischen 1 und 3 mm. Für den aus Draht hergestellten Federring wird beispielsweise Draht mit einem Durchmesser von 0,1 bis 0,3 mm, insbesondere 0,15 mm verwendet. Für die aus bandförmigem Material hergestellten Federringe nach
Vorzugsweise sind zwischen den Außenabschnitten der Führungsrohre und den Zugelementen jeweils Dichtungsmittel angeordnet, die sowohl die Außenabschnitte als auch die Zugstange dichtend umschließen.Preferably, sealing means are respectively arranged between the outer sections of the guide tubes and the tension elements, which sealingly surround both the outer sections and the pull rod.
Bevorzugt sind an den der Tintenkammer abgewandten Enden der Betätigungsöffnungen Schließmittel angeordnet.Closing means are preferably arranged on the ends of the actuating openings facing away from the ink chamber.
Die Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt, sondern umfasst auch alle im Sinne der Erfindung gleichwirkenden Ausführungen gemäß Anspruch 1.The invention is not limited to the illustrated and described embodiments, but also includes all the same in the context of the invention embodiments according to claim 1.
- 11
- Tintenstrahl SchreibkopfInkjet Stylus
- 22
- Gehäusecasing
- 44
- Tintenkammerink chamber
- 66
- Frontwandfront wall
- 88th
- Seitenwändeside walls
- 1010
- Rückwandrear wall
- 1212
- O-RingO-ring
- 1414
- Austrittsöffnungoutlet opening
- 1616
- Tinteink
- 1818
- Wölbungbulge
- 2020
- Schließkörperclosing body
- 2222
- Zugelementetension elements
- 2424
- Bestätigungsöffnungconfirmation opening
- 2626
- Führungsrohreguide tubes
- 2828
- TintenkammerabschnittInk chamber section
- 3030
- Außenabschnittouter portion
- 3232
- Bohrungdrilling
- 3434
- Anschlussendeterminal end
- 3636
- Dichtungselementsealing element
- 4040
- Wandungsabschnittwall section
- 4242
- kegelstumpfartiger Abschnittfrusto-conical section
- 4444
- zylindrischer Abschnittcylindrical section
- 4646
- Einschnürungconstriction
- 4848
- Öloil
- 5050
- Dichtungsmittelsealant
- 6060
- Federringspring washer
- 6262
- Einbuchtungindentation
Claims (9)
wobei die Zugelemente (22) derart axial bewegbar sind, dass bei einer kurzzeitigen Betätigung der Zugvorrichtung der zugehörige Schließkörper (20) von seiner Austrittsöffnung (14) abgehoben wird und Tinte (16) durch die Austrittsöffnung (14) nach außen gelangt, die Führungsrohre (26) einen in die Tintenkammer (4) hineinragenden Tintenkammerabschnitt (28) aufweisen und jeweils ein Dichtungselement (36) einen in die Tintenkammer (4) hineinragenden Tintenkammerabschnitt (28) vollständig umschließt, wobei das Dichtungselement (36) derart ausgeführt ist, dass es mit seinem freien Ende den Schließkörper (20) für die Austrittsöffnung (14) bildet, dadurch gekennzeichnet, dass ein Federring (60) vorgesehen ist, der mehr als eine Windung aufweist, wobei die Windungen entweder nebeneinander oder übereinander angeordnet sind, und dass der Federring (60) das Dichtungselement (36) im Bereich des Tintenkammerabschnitts (28) außen umgreift.
wherein the tension elements (22) are axially movable in such a way that the associated closing body (20) is lifted off its outlet opening (14) during a brief actuation of the pulling device and ink (16) passes through the outlet opening (14) to the outside, the guide tubes ( 26) have an ink chamber portion (28) projecting into the ink chamber (4), and each seal member (36) completely encloses an ink chamber portion (28) projecting into the ink chamber (4), the seal member (36) being made to mate with its free end forms the closing body (20) for the outlet opening (14), characterized in that a spring ring (60) is provided which more than a winding, wherein the windings are arranged either side by side or one above the other, and that the spring ring (60) engages around the sealing element (36) in the region of the ink chamber portion (28) on the outside.
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DE102012218062 | 2012-10-02 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3625067A1 (en) | 1986-07-24 | 1988-01-28 | Jan Slomianny | Ink jet matrix printer, in particular for labelling products |
US4723131A (en) | 1986-09-12 | 1988-02-02 | Diagraph Corporation | Printhead for ink jet printing apparatus |
DE3742090A1 (en) * | 1986-12-12 | 1988-07-07 | Markpoint System Ab | VALVE DEVICE FOR A MATRIX PRINTER |
EP0445137B1 (en) | 1988-11-05 | 1993-05-12 | Rea Elektronik Gmbh | Ink jet writing head |
EP1219439B1 (en) | 2000-12-29 | 2003-10-22 | Bauer, Wulf | Ink jet print head |
-
2013
- 2013-08-12 EP EP13180120.1A patent/EP2716459B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3625067A1 (en) | 1986-07-24 | 1988-01-28 | Jan Slomianny | Ink jet matrix printer, in particular for labelling products |
US4723131A (en) | 1986-09-12 | 1988-02-02 | Diagraph Corporation | Printhead for ink jet printing apparatus |
DE3742090A1 (en) * | 1986-12-12 | 1988-07-07 | Markpoint System Ab | VALVE DEVICE FOR A MATRIX PRINTER |
EP0445137B1 (en) | 1988-11-05 | 1993-05-12 | Rea Elektronik Gmbh | Ink jet writing head |
EP1219439B1 (en) | 2000-12-29 | 2003-10-22 | Bauer, Wulf | Ink jet print head |
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