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
  • B41J2/17—Ink jet characterised by ink handling
  • B41J2/175—Ink supply systems ; Circuit parts therefor
  • B41J2/17596—Ink pumps, ink valves
• • 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
  • B41J2/17—Ink jet characterised by ink handling
  • B41J2/175—Ink supply systems ; Circuit parts therefor
• • 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
  • B41J2/055—Devices for absorbing or preventing back-pressure
• • 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
  • B41J2/135—Nozzles
  • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
  • B41J2/16517—Cleaning of print head nozzles
• • 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
  • B41J2/17—Ink jet characterised by ink handling
  • B41J2/175—Ink supply systems ; Circuit parts therefor
  • B41J2/17503—Ink cartridges

Definitions

• the invention is directed to an apparatus and method for flushing and / or operating an ink or ink jet printhead equipped with an upstream pressure damper, the pressure damper having a closed, at least partially bounded by a preferably air- and / or liquid-tight film Chamber is provided.
• DE 2 224 590 A discloses vibrations of the ink supply tube which can temporarily expose the ink supply, and it is therefore proposed to arrange a small auxiliary reservoir fed from the actual ink container on a carriage carrying the writing device and from there to transfer the ink in a short, thin hose as possible vibration-free to the actual stylus to guide.
• vibrations are also caused on a carriage, which results, for example, in a widespread formation of air bubbles.
• the ink entrained on the carriage provides an additional mass that must be additionally accelerated with each change in the speed of the carriage, again causing pressure surges in the ink system.
• DE 31 37 970 A1 proposes to arrange within such an auxiliary reservoir a flexible bubble whose interior is connected to the atmosphere, so that the ink pressure within the auxiliary reservoir always remains approximately constant, namely on the
• DE 35 25 810 A1 shows a damping and filter element for supplying ink to a Tintenstrahlschreibkopf, with a trough-shaped, meandering depression in a bottom part, which is closed by a flexible wall on the upper side and thereby separated from the atmospheric pressure above the flexible wall.
• the flexible wall can momentarily bulge inward or outward for a short time, thereby dampening such pressure fluctuation.
• the space in the trough-shaped depression is indeed closed to the atmosphere, but not to a supply hose, from where for lack of a valve constantly pressure fluctuations can occur.
• the bottom part is provided with a mounting wall, which serves as a cover plate, to which the actual Tintenstrahldruckopf is fixed by means of screws.
• a suction channel leads from the meandering depression in a bottom portion to a gap between the end plate and the ink jet printhead and directs the air entrapment-free ink liquid to a cavity with piezoceramic pressure generators of the ink jet printhead.
• a second channel is provided in the serving as the end plate for mounting the ink jet print head mounting wall, which opens at an outer terminal - probably for a Rinse hose - blind.
• a flushing hose would have to be connected manually to this connection. Permanent, such a flushing hose can not remain connected because of those again
• the pressure damper is provided with a continuous channel from its entrance to its exit, which on the one hand distorts its damping capacity and on the other hand makes it difficult to produce the vacuum required for modern piezo inkjet printheads, because ink is imbibed immediately at each vacuum becomes.
• the refill valve within the damper chamber of the pressure damper, the channel open on both sides within the damper according to DE 690 06 521 T2 closed on the input side as long as the refill valve is closed.
• the pressure within the damper chamber is completely decoupled from inflow-side pressure fluctuations and only briefly coupled to the ink supply system during short refill phases.
• the refill valve may be set to open at a negative pressure threshold below the negative pressure typical of piezo ink jet printheads; it may even be set to close again at a still negative pressure value (ie below atmospheric pressure), hence the pressure in the damper chamber never reaches atmospheric pressure.
• This refill valve may react to the bulge of the damper foil due to the pressure difference of the inner ink pressure to the outer atmospheric pressure. Since it is completely arranged inside the damper chamber, however, it can not be opened from the outside, so that a flushing process by the pressure damper hinduchr is not possible. Therefore, an external flushing connection is provided, similar to the DE 35 25 810 A1. As there, however, then automatic rinsing is not possible here either, because the rinsing hose has to be removed manually to avoid pressure fluctuations after each rinsing process. Therefore, externally controllable means for exerting an external pressure on at least a portion of the film bounding the chamber is provided outside the chamber.
• the invention is further characterized by a control chamber having at least one opening, which bordering the damper chamber Area of the damper foil faces.
• this pressure within the control chamber in contrast to the pressure in the damper chamber can be actively influenced from the outside.
• the curvature of the damper foil can be selectively influenced at any time and therefore also adjusted so that thereby the refill valve is opened in the damper chamber.
• this refill valve is opened, the print head can be flushed with ink simply by applying pressure from the sides of the ink reservoir, for example by means of a pump.
• control chamber In order to be able to influence the pressure within the control chamber in a targeted manner, that one must be hermetically closed or closable in relation to the environment, ie the atmosphere.
• the control chamber has only one opening, which faces the damper foil, and possibly also a connection from where the filling pressure or the filling volume can be influenced.
• the control chamber could also have a plurality of openings, which would then each face one of the damper foils of the various pressure damper.
• the position of the damper foil can thus be set differently in response to a varying inflation pressure within the control chamber and / or in response to a varying mass of fluid within the control chamber; both effects affect the pressure and actual volume of the control chamber and accordingly the deflection of the damper foil between the control chamber and the damper chamber.
• the control chamber could thus be filled with a different fluid than the damper chamber, in particular even with a liquid, for example. Ink or water.
• an air filling in the control chamber has the advantage that it behaves just like the atmospheric air without a control chamber, so that the control chamber in unpressurized state, ie without overpressure and without negative pressure relative to the atmospheric pressure, imperceptible from the damper foil and thus the original switching behavior, namely the pressure-dependent opening of the refill valve at negative pressure in the damper chamber, and closing about after a pressure equalization is not affected.
• this non-pressurized state can be established at any time.
• the invention can be further developed such that the opening facing the damper foil is covered in the control chamber by a control foil.
• a control foil has the advantage of a pronounced flexural elasticity or even a tensile elasticity and can therefore react sensitively to a changed filling compound and / or a changed filling pressure within the control chamber.
• Such a control film can then form a two-dimensional contact with the actual damper foil, so that the two together behave virtually like a single foil.
• the use of a separate control film is especially recommended when air is not used as the control fluid. Then, the controller of the Pressure damper be dismantled without the control fluid escapes.
• such a control film should be impermeable to air and / or liquid-impermeable.
• Such a control film should be flexible and / or elastic, so that its deflection is easily controllable, and it should be tightly sealed around its anchorage and at the same time to seal the control chamber at the edge of the opening in the control chamber.
• the opening in the control chamber has approximately the same dimensions as the edge region of the damper chamber formed by the damper foil.
• the opening in the control chamber should have a circular circumference, so that the damper foil can bulge uniformly over its entire surface, without local overloads of individual surface areas.
• a flow of a control field into the control chamber into or out of the control chamber is made possible by the fact that on the housing of the control chamber Connection for a control line is arranged.
• the invention is further characterized by air as the control fluid. This is always sufficiently present in the atmosphere and therefore does not need to be stored.
• a compressor may compress the air to fill the control chamber; for their emptying can easily be opened an outlet valve, in which case a pressure equalization with the atmosphere can take place.
• a pressure sensor is arranged on the control chamber and / or on the control line in order to detect and / or regulate the control pressure.
• a pressure sensor can also be arranged on the pressure damper or downstream thereof in order to be able to detect an opening of the refill valve in the damper chamber. Because such a refill valve is usually opened as a result of the concavity of the damper film, especially if this concavity is due to a negative pressure within the damper chamber. When opening the refill valve, this pressure increases again.
• the refill valve in the damper chamber may be biased by a spring element into a closed position.
• this spring element can act directly or indirectly on the damper foil and bias it outward or bulge outwards, and thus forms a counter force for an external air pressure, which therefore is normally not able to open the refill valve. Only if the pressure within the damper chamber decreases as a result of consumption of the ink contained therein, after a certain hysteresis of the external pressure wins the upper hand and can open the refill valve, so that in this way a simple two-step control is realized.
• This coupling can be realized in such a way that the spring element presses a movable element of the refill valve in a prestressed state against the damper foil from the inside, as well as possibly together with that in an outward direction.
• control pressure of the control fluid required to open the refill valve is greater than the force of the spring element required to close the refill valve, divided by the area of the damper foil.
• a pressure can be exchanged via the damper foil, that is, in the state of equilibrium, the total forces acting on both sides of the damper foil-ie within the control chamber on the one hand and within the damper chamber on the other hand-are approximately equal.
• a control pressure within the control chamber - that is, an overpressure relative to the atmospheric pressure - must therefore basically apply or overcome the biasing force of a spring element within the damper chamber.
• a device can also be used for operating an ink or inkjet printhead equipped with an upstream pressure damper, wherein the pressure damper is provided with a closed damper chamber, at least partially surrounded by a damper foil, in which a refill valve is arranged for refilling the damper chamber Ink in response to an indentation of the damper film into the damper chamber into, if outside the damper chamber a controllable means is provided for exerting a preferably variable and / or predetermined, external pressure on at least one region of the damper foil which projects over the damper chamber in order to exert an adjustable pretensioning on the refill valve arranged in the damper chamber. Without such a device, the bias depends only on the atmospheric pressure, which is subject to weather-related fluctuations.
• a switching threshold for an internal refill valve can be set to a specific value.
• an externally acting (counter) pressure can be kept exactly constant, and / or controlled to specific pressure values as required.
• the invention may also be described as an apparatus for operating and / or rinsing an ink or ink jet printhead equipped with an upstream pressure damper, the pressure damper being provided with a closed damper chamber at least partially surrounded by a damper foil, comprising one of A damper chamber arranged refill valve for refilling the damper chamber with ink in response to a concavity of the damper film into the damper chamber, and arranged outside the damper chamber, controllable means for exerting an external pressure on at least one damper chamber of the region of the damper foil to that in the damper chamber arranged to open the refill valve while creating a continuous open channel through the pressure damper for flushing the ink or ink jet print head, and / or to the arranged in the damper chamber refill valve to exercise an adjustable bias.
• Figure 1 is a perspective view of an apparatus for flushing an ink or ink jet printhead of the invention mounted on a pressure damper located upstream of the ink or ink jet printhead.
• FIG. 2 shows the pressure damper of the arrangement according to FIG. 1 in a front view, with a purging device removed;
• Fig. 3 is a rear view of the pressure damper of Fig. 2;
• Fig. 4 is a longitudinal section through the arrangement of FIG. 2 in the normal
• FIG. 5 a of FIG. 4 corresponding longitudinal section through the Fig. 2 at
• Fig. 6 shows a pressure damper according to the invention according to another
• Embodiment of the invention in a front view similar to Fig. 2;
• Fig. 7 is a rear view of the pressure damper of Fig. 6; such as
• Fig. 8 shows a section through the pressure damper of Fig. 6 entang a middle, parallel to the front cutting plane.
• the device 1 shown in Fig. 1 of the drawing serves the purpose of flushing an ink or ink jet printhead, not shown, with ink through an upstream pressure damper 2.
• the internal structure of the pressure damper 2 can be seen in FIGS. 2 to 5:
• the pressure damper 2 is provided with a closed damper chamber 4 bordered at least in part by a damper foil 3, wherein a backfill valve 5 is provided which controls the refilling of the damper chamber 4 with ink in response to an indentation of the damper foil 3 into the damper chamber 4.
• the housing 7 of the pressure damper 2 has the shape of an open at both flat sides of the frame 8 with four interconnected walls, namely a top 9, a bottom 10 and two interconnecting these long sides 11th
• first hose connection piece 12 for a first hose which, for example, leads to an ink reservoir.
• a second hose connector 13 for a second hose, which further directs the ink to the actual print head.
• this connection could also be made without a hose, if the pressure damper is in the immediate vicinity of the print head.
• the two flat sides of the preferably made as an injection molded part housing 7 are open; However, the top 9, bottom 10 and the two longitudinal sides 11 by an inner partition 14 together which is preferably closer to the rear side 15 of the frame 8 shown in FIG. 3 than the front side 16 shown in FIG. 2.
• the ink within the pressure damper can flow alone under the influence of gravity.
• the inner structure of the pressure damper 2 is divided into an upper portion 17 and a lower portion 18.
• the space in the lower portion 18 in front of the intermediate wall 14 is almost completely occupied by the damper chamber 4, which is surrounded by a cylindrical lateral surface 19 which concentric with a horizontal axis in the center of the lower portion 18 is arranged.
• the damper chamber 4 does not extend completely over the entire thickness of the pressure damper 2, but only from the open front side 15 of the frame-shaped housing 7 to its intermediate wall 14.
• the cylindrical lateral surface 19 is partially connected to the bottom 10 and the two longitudinal sides 11, such as shown in Fig. 2.
• the intermediate wall 14 In the upper portion 17 of the pressure damper is behind the intermediate wall 14 is an approximately rectangular filter chamber 20 adjacent to doe top 9 on the one hand and on one of the two longitudinal sides 11 on the other.
• a fine-meshed ink filter 21 is arranged with the intermediate wall 14 parallel ground plane.
• the ink filter 21 has both a distance to the intermediate wall 14 and to the back
• the entire, open front 16 of the housing 7 is covered by a on the front end edges of the top, bottom and longitudinal walls 9, 10, 11 glued, flexible foil 22, which in the field of
• Dämpferkamer 4 forms the local damper film 3.
• the entire, open rear side 15 of the housing 7 is covered by a, preferably less flexible film 23 adhered to the rear end edges of the upper, lower and longitudinal walls 9, 10, 11.
• a first flow channel 24 integrated in the housing 7 leads to the rear part of the filter chamber 20, behind the ink filter 21.
• a second flow channel 25 branches off laterally from its front part between the ink filter 21 and the intermediate wall 14 and extends in front of the intermediate wall 14 approximately horizontally from the filter chamber 20 to that of the opposite longitudinal side 11 of the housing 7.
• a third flow channel 26 which in turn behind the intermediate wall 14 at that along and extends with respect to the damper chamber 4 radially inwardly to behind the center 27 extends.
• the damper chamber 4 in turn, there is an opening to the damper chamber 4, and there is then the refill valve 5, which finally opens with its downstream mouth into the damper chamber 4 inside.
• ink may flow from the upstream side hose fitting 12 via the first flow channel 24, the rear filter chamber portion, through the ink filter 21 to the front filter chamber portion, and thence via the second flow channel 25 and the third flow channel 26, and through the second Refill 5 flow through into the damper chamber 4.
• the refill valve 5 closes again, and from there, the ink can then be sucked and printed by the print head if necessary, while the refill valve 5 remains closed and thereby upstream pressure surges of the damper chamber 4 and thus of the actual Keeps pressure system away.
• the refill valve 5 is opened and closed only in response to the pressure conditions in the damper chamber 4.
• the opening of the third flow channel 26 in the damper chamber 4 at the flow channel 26 facing the mouth of an inner film or membrane is covered, which is normally pressed by the pressure upstream of the damper chamber 4 fixed to the mouth of the opening and then closes ,
• This inner film or membrane can not be opened from the outside, but only from a located inside the damper chamber 4, the central plunger 28 are pressed outwards, ie towards the back 15 of the housing 7, in which case the inner film or membrane of the upstream Mouth of the opening between the third flow channel 26 and damper chamber 4 lifted and thus the refill valve 5 is opened.
• the plunger 28 is located on the back of a plate 29, which rests flat against the inside of the damper foil 3.
• the plate 29 may have a circular disk-shaped geometry and be integrated with the plunger 28 into a single part, for example, be made with that as a common injection molded part.
• the plunger 28 undergoes a loose leadership within the Druchbrechung between the third flow channel 26 and the damper chamber 4, wherein this opening to improve the leadership by a in the Damper chamber 4 projecting into it, cylindrical rim or skirt can be surrounded.
• the plunger 28 but also serves as a leading soul for a spring element, in particular a coil spring 30 which loosely surrounds the plunger in the form of a helical line.
• This coil spring 30 is supported on the one hand on the intermediate wall 14 in the vicinity of the opening between the third flow channel 26 and damper chamber 4 and on the other hand on the back of the plate 29.
• the coil spring 30 is preformed so that it is slightly longer than the force-free state Thickness of the damper chamber 4 between the intermediate wall 14 and the damper foil 3 and therefore endeavors to press the plate 29 from the inside firmly against the damper foil 3 and can even push the bending elastic damper foil 3 slightly outward.
• This arrangement has the advantage that not only particles and air bubbles are retained in the ink filter 21, but also pressure surges and fluctuations are kept away from the actual printhead by the membrane of the closed refill valve 5, so that this optimally with pure, evenly for the printing process flowing ink is supplied.
• this arrangement has another disadvantage, which is related to the fact that the refill valve 5 is arranged completely inaccessibly completely outside within the damper chamber 4. An external overpressure upstream of the refill valve 5 can not open this, but only presses the membrane more against the edge of the opening between the damper chamber 4 and immediately upstream of the same arranged flow channel 26. It would therefore break the pressure damper 2 rather than that Ink or inkjet printhead could be flushed with ink through the pressure damper 2, if it is not possible to open the refill valve 5 within the damper chamber 4 before rinsing.
• the invention provides a controllable device 6 arranged outside the damper chamber 4 for exerting an external pressure on at least one region of the damper foil 3 bordering the damper chamber 4, in order to open the refill valve 5 arranged in the damper chamber 4 and thereby open it continuously Channel through the pressure damper 2 through to rinse the ink or ink jet printhead to create.
• the externally controllable device 6 comprises a cuboid, preferably plate-shaped housing 31 with two opposing flat sides 32 and four end faces connecting to one another, namely an upper side 33, a lower side 34 and two longitudinal sides 35.
• the top and bottom 33, 34 may be equal to each other, however, are shorter than the two, also mutually equal longitudinal sides 35th
• the base of the housing 31 of the controllable device 6 is approximately equal to the base of the housing 7 of the pressure damper 2.
• the housing 31 can be flat and approximately congruent attached to the front 16 of the housing 7 or applied and fixed there in this position, for example by means of adhesive.
• the housing 31 encloses a control chamber 36, which has approximately the same geometry and base area as the damper chamber 4, and is also positioned in the housing 31 corresponding to the position of the damper chamber 4 in the housing 7, so that when congruent assembly of the pressure damper 2 and the controllable device 6 can bring the control chamber 36 with the damper chamber 4 to cover.
• the control chamber 36 may have an opening 37 on one or both flat sides 32 of the controllable device 6. Normally, i.e., for controlling a single damper foil 3, there should be only a single opening 37, and that flat side 32 with the then single opening 37 may be referred to as the front. Only if two pressure damper 2 are to be controlled simultaneously, a second opening 37 may be provided, which would then be arranged on the other flat side 32.
• the controllable device 6 is positioned with its flat side 32 having the opening 37 on the front side 16 of the pressure damper 2 such that the control chamber 26 and the damper chamber 4 are approximately concentric with each other and separated there only by the damper foil 3.
• the control chamber 36 is sealed by the housing 31 on the one hand and by the opening 37 in the flat side 32 covering damper film 4; However, located in the edge of the control chamber 36 a respective end face, so preferably a longitudinal side 35 or the bottom 34 of the controllable device 6 passing through the control opening 38, which may be provided with an internal thread for screwing a hose connection piece.
• an angle piece 39 is screwed in by way of example, on which then a control hose can be fastened.
• a control medium can then be conveyed into the control chamber or drained from there via such a control hose.
• Preferably serves as a control medium compressed air or compressed atmospheric air, although a liquid would be conceivable. If a control medium is conveyed or pressed into the control chamber 36, the damper foil 4 bulges out of the control chamber 36 and into the damper chamber 4 under the internal overpressure built thereby, pushing the plunger 28 against the inner foil or plate 29 due to the plate 29 Membrane of the refill valve 5 and opens that even when just no negative pressure in the damper chamber 4 prevails. Now the refill valve 5 is opened and the printhead can be flushed with ink.
• the pressure can be released from the control chamber 36, and the spring 30 pushes the plate 29 together with plunger 28 and the damping foil 3 abutting it outward, ie in the direction of the damper chamber 4 to the control chamber 36, wherein the Refill valve 5 is closed again. If the control chamber 36 is completely deaerated or depressurized, the atmospheric pressure again takes over the counterpart of the compression spring 30, and the refill valve 5 is again automatically opened and closed in order to regulate the pressure within the damper chamber within narrow limits within the scope of a two-point control.
• the working point of the spring 30 can also be set by applying a variable pressure to the outside of the damper foil 3 facing away from the damper chamber 4. That is, if the spring 30 should, for example, lose tension over time, by increasing the pressure beyond the damper foil 3, a greater deflection of the spring 30 can be caused so that it is displaced to an operating point where it returns a stronger spring force generated, which then has to be overcome to open the refill valve 5.
• the Tiefenersteckung of the frame 8 '- ie the distance between its back 15' and its front 16 '- not the depth of extension of the damper chamber 4' and that receiving pressure damper. 2 ', but is greater than that and corresponds to the sum of the depth extensions of the pressure damper 2' on the one hand and the device V according to the invention for controlling the refill valve 5 'within the damper chamber 4'.
• the pressure damper 2 'itself is divided into an upper portion 17' and a lower portion 18 '. While in the lower portion 18 '- surrounded by a preferably cylindrical lateral surface 19' - the actual
• Damper chamber 4 ' is located in the upper portion 17' an optional filter chamber 20 'with an ink filter 21' is arranged.
• the filter chamber 20 ' is connected upstream of the ink filter 21' by a first flow channel 24 'with the inlet-side hose connection piece 12', while a second flow channel 25 'downstream of the ink filter 21' located part of the filter chamber 20 'with the refill valve 5' in the center 27th 'the damper chamber 4' connects. From the periphery of the damper chamber 4 'then performs a third flow channel 26' to the outlet side hose connection piece 13 '.
• the internal structure of the refill valve 5 ' may be identical to the refill valve 5 according to FIGS. 4 and 5, or may have a similar or equivalent structure.
• the actual pressure damper 2 'can as in the first embodiment, be covered on its two flat sides by at least one film, namely by a front film 22' and by a rear film 23 '.
• the front film 22 ' is subdivided into a first film section 40 covering the upper section 17' of the pressure damper 2 'and a second film section 41 covering the lower section 18' of the pressure damper 2 '.
• the first Folenabêt 40 to the rear foil 23 ' has a distance corresponding to the entire depth of the housing-side frame 8', while the second film portion 41 has a reduced contrast, which corresponds only to the depth extent of the damper chamber 4 '.
• the frame 8 'in its lower portion 18' in addition, namely on its front side 16 ', be closed by a preferably rigid cover 42.
• This cover 42 may lie in a common alignment with the first film section 40 in the upper portion 17 'of the housing 7'.
• control chamber 36' which is largely sealed airtight to the outside. It communicates with the outer space of the pressure damper 2 'and control device 1' existing assembly only through a channel 44 which leads from the control chamber 36 'to the frame 8', preferably to the top 9 ', and flows into a local hose connection piece 45, at which an unillustrated control hose can be connected.

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• Ink Jet (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2017
  • 2017-06-09 DE DE202017003026.8U patent/DE202017003026U1/de active Active
• 2018
  • 2018-06-11 EP EP18795796.4A patent/EP3634762A2/de active Pending
  • 2018-06-11 CA CA3066545A patent/CA3066545C/en active Active
  • 2018-06-11 WO PCT/IB2018/000616 patent/WO2018224884A2/de active Application Filing
  • 2018-06-11 US US16/707,193 patent/US20200189288A1/en not_active Abandoned
  • 2018-06-11 CN CN201880037655.2A patent/CN110881272B/zh active Active
  • 2018-06-11 JP JP2019567576A patent/JP7276861B2/ja active Active

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