EP0263689A1 - Tête d'application de fluide - Google Patents

Tête d'application de fluide Download PDF

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Publication number
EP0263689A1
EP0263689A1 EP19870308876 EP87308876A EP0263689A1 EP 0263689 A1 EP0263689 A1 EP 0263689A1 EP 19870308876 EP19870308876 EP 19870308876 EP 87308876 A EP87308876 A EP 87308876A EP 0263689 A1 EP0263689 A1 EP 0263689A1
Authority
EP
European Patent Office
Prior art keywords
fluid
flushing
applicator
applicator head
flow
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.)
Withdrawn
Application number
EP19870308876
Other languages
German (de)
English (en)
Inventor
Franz-J. Funk
Ulrich Schepe
Manfred Meise
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Willett International Ltd
Original Assignee
Willett International Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19863634137 external-priority patent/DE3634137A1/de
Priority claimed from GB878711383A external-priority patent/GB8711383D0/en
Application filed by Willett International Ltd filed Critical Willett International Ltd
Publication of EP0263689A1 publication Critical patent/EP0263689A1/fr
Withdrawn legal-status Critical Current

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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
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids

Definitions

  • the present invention relates to a fluid applicator head, notably to a drop on demand jet printing head assembly incorporating a means for flushing ink or other fluids from the nozzle orifice, and to a method for operating such a head.
  • ink, adhesive or other fluid is ejected from a fixed array of nozzles in a print head.
  • the flow of fluid through the nozzles can be caused by exerting a pressure pulse on the fluid immediately upstream of the nozzle orifice, for example when a wall of the print head is caused to flex under the action of a piezoelectric crystal.
  • the flow of fluid can be controlled by actuating valves, eg. electromagnetic valves, in the fluid flow lines between a reservoir under pressure and the nozzles in the print head.
  • the pattern in which the droplets are deposited on a substrate moving transversely past the nozzles is determined by the sequence in which the nozzles or their valves are operated.
  • drop on demand printer heads will be denoted herein as drop on demand printer heads.
  • the fluid often contains solvents or other carrier fluids which readily evaporate or, in the case of adhesives, is a composition which contains ingredients which tend to separate out from the composition if it is allowed to dry out or to stand for any length of time.
  • solids tend to separate out from the fluid and to obstruct the nozzle orifices or the conduits serving them. This causes problems whenever the operation of the applicator head is interrupted for any length of time.
  • the applicator head In order to reduce problems with drying out of the fluid at the nozzle orifices, it has been proposed to provide the applicator head with a pad or other means which is used as a cap to cover the nozzle orifices when the applicator head is not in use.
  • the pad often adheres to the face of the applicator head and such a device does not overcome the problem of deposition of solids from the fluid within the applicator head during standing.
  • the head has remained static with the desired fluids fed to it by suitable ducting.
  • this requires the use of some means for collecting the flushing fluid as it leaves the applicator head so that it will not reach the substrate onto which ink or other fluid is to be applied at a later stage, yet this collection means must not prevent the ink or other fluid reaching the substrate when operation of the applicator head is re-commenced.
  • the flushing ⁇ is not always successful in removing the more tenacious deposits from the applicator head.
  • droplet formation at the nozzle orifice during operation of the applicator head can be deleteriously affected by the presence of the flushing fluid ducts in the applicator head.
  • the present invention provides a fluid applicator head in which fluid is to be ejected through a plurality of nozzle orifices, notably by means of pressure pulses or by means of valve means which control the flow of fluid through the nozzle orifices, which applicator head can be flushed out by passing a flushing fluid through the nozzle orifices, characterised in that the applicator head is adapted to be moved from a first, operative position at which it can apply droplets of a fluid to a substrate opposed to the nozzle orifices, to a second, flushing position at which the nozzle orifices engage with a flushing member incorporating fluid flow conduits, whereby flushing fluid can be caused to flow through the nozzle orifices or through conduits associated therewith.
  • the flushing position comprises a member against which the areas of the applicator head adjacent the nozzle orifices seat and through which flushing fluid can be caused to flow in either or both directions through the nozzle orifices.
  • the applicator head is reciprocated and/or pivotted to move into register with a flushing member having a surface adapted to receive the nozzle outlet face of the applicator head in a sealing engagement and having conduits therein to receive flushing fluid from the nozzle orifices and/or from a source of flushing fluid.
  • the invention also provides a method for operating an applicator head of the invention which comprises moving the head from its first position to its second position when it is desired to flush out the applicator head and causing flushing fluid to flow through the nozzle orifices.
  • the presence of the flushing fluid ducts within the applicator head can deleteriously affect droplet formation at the nozzle orifice.
  • the flushing fluid is introduced by means of an orifice in a duct which intersects and passes across the conduit feeding fluid to the nozzle orifice, problems with droplet formation are reduced.
  • the present invention provides a fluid applicator head of the invention having a first fluid conduit whereby fluid can be caused to flow through a nozzle orifice located terminally upon the fluid flow conduit, and having a second fluid duct which intersects the first conduit and is provided with an aperture through which fluid from the second conduit can flow into the first conduit, said aperture being located within the first conduit and being directed substantially along the intended line of flow of fluid through said first conduit.
  • the second fluid duct is provided as a substantially cylindrical tube which passes diametrically through the first conduit and the aperture for the second fluid is located substantially upon the longitudinal axis of the first duct. It is particularly preferred that the second duct have a plan area normal to the line of flow of fluid through the first conduit which is from 40 to 95% of the cross-sectional area of the first conduit at that point. It is also preferred that the second duct present a rounded surface to the flow of fluid through the first conduit.
  • the applicator head of the invention can be applied to a wide range of types of drop on demand applicators, including those in which the fluid is ejected from the nozzle by the action of a transducer, such as a piezoelectric crystal, acting directly on the ink itself or on a flexible or deformable wall of a chamber in fluid flow communication with the nozzle orifice to generate a pressure pulse within the fluid to cause a droplet to be ejected through the nozzle orifice.
  • a transducer such as a piezoelectric crystal
  • the invention is of especial use with drop on demand applicator heads in which the fluid flow to the nozzle orific e is controlled by the action of a valve means, notably a solenoid valve, in the pressurised fluid flow line to the nozzle orifice.
  • a valve means notably a solenoid valve
  • the fluid to flow through the applicator head can be selected from a wide range of organic solvent- or water-based visible ink compositions; from compositions based on a thermoplastic carrier medium such as a meltable wax or resin; and compositions containing other indicator media, for example UV fluorescent materials.
  • the invention can also be applied to water or solvent based adhesive compositions, notably those using polyvinylacetate polymers or co-polymers.
  • aqueous adhesive composition containing a PVA resin notably those which are quick drying or which tend to form deposits if stood for long periods.
  • the applicator head comprises a conduit through which adhesive is fed to the nozzle orifice.
  • this conduit will be a bore within a solid block, for example one machined from aluminium, brass or stainless steel.
  • the invention can be applied to structures in which the conduit is provided as a tube, eg. a stainless steel tube, linking the valve mechanism to the nozzle.
  • the bore can be one connecting a valve chamber in which the valve mechanism acts to open or close the outlet to the chamber serving the bore, with the nozzle orifice directly.
  • specific features of the design of the block for a given application may require that the bore follow a tortuous path and/or include one or more intermediate chambers.
  • the invention will be described in terms of the use of a bore which feeds fluid directly from the valve mechanism or chamber to the nozzle outlet.
  • the bore forming the conduit linking the valve to the nozzle outlet is preferably a simple circular cross-section bore which has been drilled or otherwise formed within the applicator head block.
  • the conduit walls can be given a surface coating of a material not readily wet by the fluid in order to reduce the risk of deposition of material upon the walls of the conduit.
  • the applicator head block can be formed in part or wholly from such a material, eg. polytetrafluorethylene.
  • the valve mechanism is preferably a solenoid valve mechanism. This can be located wholly within the applicator head and can utilise bores within the head to provide some of the bores required for the proper operation of the valve mechanism. However, it is preferred that the valve mechanism be demountable as a unit from the applicator head for ease of servicing and/or replacement.
  • the applicator head will usually comprise a valve chamber having means for receiving the valve mechanism in sealing engagement therewith and having a fluid feed bore or bores for feeding fluid to the inlet to the valve mechanism, the outlet from the valve being connected to the conduit serving the nozzle orifice.
  • the feed will incorporate the use of a manifold for distributing the flow of fluid between several valve mechanisms, each serving a single nozzle orifice or set of orifices.
  • the applicator head incorporates a fluid feed bore connecting each of the valve mechanisms and serving as the manifold.
  • Such a bore typically runs longitudinally along the applicator head block with the conduits feeding the nozzle orifices running transversely from the valve chambers.
  • the longitudinal bore has connections to each of the chambers in which the valves are located.
  • the applicator head is made from an elongated block of metal having a longitudinal bore acting as the fluid inlet and manifold.
  • This bore intersects a number, typically five to sixteen, transvers e bores which provide recesses into which solenoid valves seat with their inlet ports exposed to the recesses to receive fluid from the bore.
  • the outlet ports from the valves are in sealing engagement with transverse conduits leading through the head block, one to each nozzle orifice served by a given valve.
  • the longitudinal bore is connected by flexible pipes or other suitable means to a source of fluid adhesive under pressure.
  • the applicator head is provided with means for feeding flushing fluid into the bores serving the nozzle orifices.
  • the flushing fluid may be caused to pass through the whole of the adhesive flow path through the applicator head. However, it is preferred that it pass through only that area of the flow path adjacent the nozzle orifice, for example through the valve chamber, the nozzle orifice and the conduit connecting them.
  • the flushing fluid is fed from an external source through bores within the applicator head block into the valve chambers or into the bores connecting the chambers to the nozzle orifices.
  • the flushing fluid is conveniently fed from a pressurised source via flexible pipes or the like which can accommodate the movement of the head between its operative and flushing positions. If desired, the head can be connected to the flushing position so that flushing fluid is cycled through the head and the flushing means.
  • conduits which intersect the transverse conduits feeding the nozzle orifices.
  • These conduits can be bores within the head block feeding inserted tubes crossing the transverse conduits, the inserted tubes having apertures for feeding the flushing fluid axially into the transverse conduits.
  • the bores can be fed from a manifold as for the supply of the adhesive fluid to the conduits.
  • the flushing fluid flow be fed through a single longitudinal tube which intersects each of the transverse conduits so that a single tube serves and connects all of the conduits.
  • the conduit or inserted tube for the flushing fluid passes transversely through and across the conduit connecting the valve chamber and the nozzle orifice.
  • the flushing conduit or tube preferably presents a rounded upper surface to the flow of fluid through the conduit it intersects, and preferably presents a substantially semi-circular cross-section to that flow.
  • the lower, or downstream face of the flushing fluid conduit or tube can be of the same shape, as when the tube has a substantially circular cross-section; or can have a tapered or streamlined shape, as when the tube has an inverted drop-like cross-section.
  • the outlet for the flushing fluid from the conduit or tube is located on the downstream wall of the tube so that the flushing fluid flowing from the tube is directed along the same line of flow as the adhesive through the conduit.
  • the outlet is located substantially co-axially of the conduit and has a circular orifice.
  • the flushing fluid is fed by a tube extending longitudinally along the applicator head and generally parallel to the bore carrying the adhesive feed.
  • the flushing fluid tube intersects with each of the transverse conduits linking the valve chambers with the nozzle orifices and extends diametrically across the conduits.
  • the tube has a circular outlet orifice directed along the axis of the conduit.
  • the tube is of a suitable size for the flow of flushing fluid to be fed into the conduits.
  • the outlet is of a suitable size for the flow rate required.
  • the diameter of the tube and the size of the outlets can be varied along the length of the tube.
  • the tube can occupy a substantial proportion of the cross-sectional area of the transverse conduit, typically from 50 to 90%, notably about 75 to 90%, of the cross-sectional are a of that conduit without deleteriously affecting the formation of droplets at the nozzle orifice where the fluid is fed to the nozzle orifice at pressures of from 0.05 to 1 bar.
  • the outlet for the flushing fluid has a diameter of from 15 to 90% of the diameter of the tube and a suitable diameter can be readily determined by simple trial and error tests.
  • the feed of flushing fluid through the second fluid flow line is preferably controlled by a valve means for each transverse, adhesive conduit it intersects.
  • the conduits are not in contact with any significant volume of fluid in the flushing fluid flow lines which might act in sympathy with pressure pulses within the adhesive conduit.
  • the transverse conduits will be interlinked with one another by this tube and it may be possible for pressure variations in one adhesive conduit (eg. as the valve serving it opens or shuts) to be transmitted from one adhesive conduit to another. It is therefore preferred to provide valve or other means for isolating the adhesive conduits from one another.
  • valves used to control the flow of flushing fluid to the adhesive conduits and to isolate the adhesive conduits from one another can be selected from a wide range of types.
  • a preferred form of valve is a sliding sleeve or plug type valve which can be operated pneumatically under the control of the centralised control system, eg a micro-processor, regulating the operation of the applicator head in known manner.
  • the valves it is also within the scope of the present invention for the valves to be operated by push buttons or the like protruding from one face of the print head so that the valves are automatically operated when the applicator head seats home in the flushing position.
  • the applicator head moves from an operative position over the substrate (which can be a sheet of paper, plastics or the like or an article) to which the fluid adhesive is to be applied through the nozzles to its flushing position.
  • the movement of the applicator head can be linear as when it is moved laterally from one position to the other. However, it is preferred that the movement incorporate both horizontal and vertical components so that the lower face of the applicator head carrying the nozzle orifices seats downwardly onto a seat at the flushing position to ensure sealing engagement between the applicator head and the seat.
  • the movement of the applicator head can be achieved by mounting the head on an eccentric shaft whose rotation achieves the desired lift and traverse of the head.
  • Other means for moving the head can be readily devised using known techniques. If desired, a number of applicator heads of the invention can be operated in conjunction with one another using a common mounting and movement mechanism.
  • the conduits to the nozzles and the nozzles themselves are be flushed out by passing fluid through part or all of the adhesive flow channels within the head to remove any adhesive remaining therein. This can be done merely by feeding flushing fluid to the applicator head and discharging the flushing fluid into troughs, channels or the like in the upper surface of a member at the flushing position.
  • the ports communicate with a source of flushing fluid or with bores for discharging the flushing fluid to waste or for re-cycle of the flushing fluid either directly or via a filter or other treatment.
  • the seat member can incorporate other con duits, for example for supplying compressed air or other fluids to remove flushing fluid at the end of the flushing process, and can be connected to a pump or other means for the supply or circulation of flushing fluid.
  • the applicator head preferably engages with the flushing position in sealing engagement to enable recyling of the flushing fluid and back-washing to be achieved.
  • the upper face of the member can be formed with a suitable resilient surface and/or the recesses can be provided with sealing rings or the like.
  • the action of seating the applicator head onto the flushing position can also be used to actuate the valves controlling the flow of flushing fluid through the applicator head, for example by depressing the protruding buttons actuating the valves in the second flow line.
  • the flushing fluid flows into the conduits to flush out the adhesive remaining in the conduits and the nozzles to inhibit the build up of deposits within the conduits or nozzles when operation of the print head is interrupted for any length of time.
  • the flushing fluid can be selected from a wide range of fluids, but will preferably be an aqueous detergent composition as conventionally used in the flushing of similar equipment.
  • the applicator head of the invention can incorporate other features used in jet printing heads to enhance the operation thereof.
  • the applicator head can be provided with heater means where a thermoplastic ink or adhesive is to be applied through the head; or with a buffer reservoir for storing ink or otther fluid within the head.
  • the applicator head of the invention finds use in the application of a wide range of fluids for a number of purposes where the fluid is to be applied intermittently and without the use of compressed air or other propulsive media.
  • it finds especial use in applying quick drying inks or adhesives using a drop on demand technique to a wide range of products, notably to the application of adhesive to labels for application to bottles, jars or other articles or to the articles themselves to which labels are then applied.
  • the present invention provides a method for securing one article, notably a label, to another by means of an adhesive characterised in that the adhesive is applied by means of a applicator head of the invention.
  • the compact nature of the applicator head of the invention makes it especially suitable for locations where space is at a premium and the ability to flush out the head without the need to dismantle the head is of a particular advantage. Furthermore, it will be appreciated that the flushed out applicator head can be retained in the flushing position until required to apply further quantities of the same or some other adhesive or other fluid. As a result, it is possible to pass the new adhesive through the applicator head whilst still in the flushing position at the start of the next run and to discharge that adhesive to waste through the flushing position. This enables a new run to be started with the minimum of time and with no wastage of product whilst the applicator head is being flushed out with the new adhesive to remove traces of water or detergent which may remain in the applicator head.
  • the flushing process can be varied to suit the particular applicator head and the adhesive or other fluid which is it desired to flush from the head.
  • the flushing fluid can be fed ar elevated temperature, using pressure pulses or with repeated changes in direction of flow so that repeated flushiongs and bck flushings takes place during a single flushing cycle.
  • the applicator head of Figure 1 comprises a single head 10 carried by a support mechanism 11 or 12 from its operative position to its flushing position at which the nozzle orifices of the head engage a flushing member 13.
  • the head comprises a body 14 which contains a solenoid valve 16 for controlling the flow of aqueous adhesive to a nozzle orifice 17 which is off set to one side from the outlet to the valve 16 and is connected to the valve outlet by bores 20, 21 and 22 through the body 14.
  • Bore 20 intersects with a longitudinal bore 24 for feeding flushing fluid to the bores 20, 21, 22 and the nozzle 17.
  • Bore 24 is connected to an external source of flushing fluid (not shown).
  • Bores 20 carries journalled therein a pin valve 25 which comprises a valve head 28 within bore 20 and having a shank 26, 27 which extends through a glanded seal support 31, 32, 33, 34.
  • the free end 15 of shank 26 protrudes from the bottom face of housing 14 to act as a button by which valve head 28 can be lifted out of sealing engagement with O ring 29 at the foot of bore 20 against the bias of compression spring 30.
  • the valve head 28 thus seals off flow of flushing fluid from bore 24 into bores 20, 21 and 22 until the free end 15 is depressed.
  • the solenoid valve 16 is a commercially available valve having a cylindrical casing 36 glued or otherwise secured in a bore 35 in the housing 14 with an axial valve chamber 38 extending therefrom.
  • the valve chamber is located within the foot of bore 35 and there is an annular gap 39 between its outer face and the wall of the bore.
  • a longitudinal bore 40 intersects the annular gap to feed adhesive from an external source (not shown) into valve chamber 38 via inlet 41 and internal bores within the valve 16 (not shown).
  • Wound upon casing is an electromagnet coil 37 around the magnetisable valve body 44 journalled within the housing and urged downwardly by spring 78.
  • the body 44 carries a seal surface 45 which acts upon the end of outlet pipe 42 so as to make or break the seal between the pipe and the supply of adhesive from bore 40.
  • Pipe 42 passes through an O ring seal at the top of bore 20 so that adhesive can only flow to the nozzle orifice 17 when valve 16 is actuated to lift body 44.
  • Flushing position 13 comprises a generally planar plate member 49 which has a resilient upper face 56 and a longitudinal bore 50, 53 through which flushing fluid can be fed from an external source (not shown) or through which fluid can be discharged from the nozzle 17 when in the flushing position.
  • Member 49 has a recess 54 connected by a vertical bore 51, 52 to bore 53.
  • Recess 54 carries an 0 ring seal 55 into which the tip of nozzle 17 will bed when the head 14 is in the flushing position.
  • the base of head 14 is stepped so that one portion of the base thereof will rest upon surface 56 when in the operative position but will be raised clear of surface 56 when the head is moved into the flushing position at which the lower step of the base (carrying the nozzle 17 and the pin valve mechanis m 15, 26, 27, 28) will rest upon face 56.
  • the upper step of head 14 carries a plug 57 which engages recess 54 to prevent ingress of dirt during the operation of the head.
  • the support mechanism for head 10 comprises two uprights 11 having a plate 59 slideably held between them. Head 10 is secured to plate 59. Plate 59 is mounted upon shafts 62 extending between the uprights 11 by means of two eccentrics 61. Shafts 62 are rotated by means of a rack and pinion drive 64, 65 to carry plate 59 upwards and inwards by virtue of the eccentrics 61. This has the effect of carrying head 10 from its operative position shown in Figure 1 to the flushing position shown in Figure 2.
  • the plate 49 and the plate 59 are moved horizontally and vertically respectively by rams 67 and 68 so as to raise the head 10, to bring plate 49 across until nozzle 17 is in register with recess 54 and then to lower head 10 onto surface 49.
  • valve 16 is actuated in response to control signals from a control mechanism in the conventional manner to cause adhesive to issue from nozzle 17 as a series of droplets.
  • the pin valve mechanism 15, 26, 27, 28 is in the closed position and adhesive flows from bore 40 through the annular gap into valve chamber 38 and through pipe 42 into bores 20, 21 and 22 to nozzle 17.
  • head 10 is moved into its flushing position in which nozzle 17 seats into recess 54 and valve body 44, 45 seals the end of pipe 42. Flushing fluid is fed either trough bore 24 in head 10 or bore 53 in plate 49 to cause fluid to flow trough the nozzle 17 and bores 20, 21 and 22 to remove residual adhesive therefrom. Since the flushing fluid can be fed from either of bores 24 or 53, flushing and back flushing can be carried out with alternation between them if desired.
  • pin valve assembly can be replaced by a conventional valve operating on the input to either of bores 24 or 53 and under the control of the control mechanism regulating the operation of the applicator head.
  • valves 16 are mounted with one head 10.
  • the valves are mounted in staggered rows with their underlying pin valve assemblies 27, 33 as shown, with their nozzle outlets 17, 69 lying along a common axis so as to achieve a compact construction.
  • the applicator head comprises a generally rectangular block 101 of metal, eg. aluminium or stainless steel, having a longitudinal bore 102 serving as the distribution manifold for the flow of an aqueous PVA based adhesive composition fed at a pressure of about 0.8 bar from an air pressurised reservoir (not shown).
  • the bore 102 intersects a number (in this case only two are shown) of generally vertical transverse bores 103.
  • an electromagnetic valve 104 secured into the bore by any suitable means (not shown) and sealed in place by O rings or other sealing means 105.
  • the valve 104 has an inlet 106 communicating with the foot of the bore 103 whereby the valve is fed with fluid from bore 102.
  • the valve 104 has an outlet 107 which is a sealing fit into a narrower continuation of bore 103 and which acts as the conduit 108 for feeding fluid from the valve to a nozzle outlet at the foot of the conduit 108.
  • the nozzle outlet typically comprises a jewel orifice 109 with a nozzle orifice diameter of from 300 to 500 micrometres. If desired, the nozzles can be held in a nozzle plate assembly mounted on the print head block 101.
  • valve is controlled in the normal manner for a drop on demand printer by a suitable control system (not shown) to deposit the desired array of adhesive drops at the desired location onto an article passing the print head, eg. a label from a web of pre-printed labels drawn o ff a roll and cut to the desired size by a suitable cutter.
  • a suitable control system not shown
  • the print head is provided with a second londitudinal bore which serves as the fliud flow line for the flushing fluid.
  • This bore can be offset from the conduits 108 as shown in Figure 7; or can be aligned with and intersect the conduits 108 as shown in Figure 9.
  • the bore connects with a tube 111 which intersects the conduit.
  • the bore houses an insert tube 111 which is carries the flushing fluid to the conduits.
  • the bore and hence the tube 111 is connected to a source of flushing fluid (not shown).
  • the tube 111 has an aperture 112 in its lower face in register with each of the conduits 108 as shown.
  • the flow of fluid through the tube 111 is controlled by a series of push valves 113.
  • Each of the valves 113 has an actuating stem 114 extending through a bore in the print head 101 to provide a protruding push button at the base of the print head. Normally, the valves 113 are urged into their closed position by for example spring 115.
  • the stem 114 is depressed, as shown in Figure 8 and with the right hand valve of Figure 9
  • the valve moves out of register with the bore of tube 111 to allow flushing fluid to flow into the conduits 108 and out through the nozzles 109.
  • valve head In normal operation, the valve head is located as shown in Figure 7 with all the stems 114 fully extended to prevent flushing fluid from entering conduit 108 and to isolate each of the conduits from one another.
  • the head 101 When operation is interrupted and it is desired to flush out the conduits 108 and the nozzle orifices 109, the head 101 is retracted so that its bottom face bears against a platform 120.
  • the platform 120 has a series of recesses 121 adapted to receive the nozzles 109 and a series of bores connecting the recesses 121 with a flushing fluid discharge line 122.
  • the stems 114 bear against the top face of platform 120 and are depressed as the print head seats home onto the platform to allow flushing fluid to flow through the conduits 108 and the nozzles 109.
  • the front face of the platform 120 may be chamfered, tapered or otherwise formed so that the stems 114 can be progressively depressed as the print head 101 moves laterally onto the platform. Movement of the print head from its operative position clear of the platform to its inoperative position seated upon the platform can be achieved by any suitable mechanism.
  • valve stems 114 In place of actuation of the valve stems 114 by seating the print head onto platform 120, the valves can be actuated by any other suitable mechanism where the print head remains stationary.
  • an aqueous PVA adhesive is fed at a pressure of 0.8 bar through quick acting solenoid valves to jewel nozzle outlets with an orifice diameter of 400 micrometres to apply the adhesive to pre-printed labels which are then applied by pressure pad or air blast to bottles.
  • the conduits feeding adhesive from the valves to the nozzles are 1.4 mms in diameter and the flushing fluid tube is 1.0 mms diameter mounter diametrically across the conduits with an outlet 0.3 mms in diameter directed axially along the conduits.

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EP19870308876 1986-10-07 1987-10-07 Tête d'application de fluide Withdrawn EP0263689A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3634137 1986-10-07
DE19863634137 DE3634137A1 (de) 1986-10-07 1986-10-07 Verfahren und vorrichtung zum diskontinuierlichen aufbringen eines aushaertenden stoffes auf einen gegenstand
GB878711383A GB8711383D0 (en) 1987-05-14 1987-05-14 Print head assembly
GB8711383 1987-05-14

Publications (1)

Publication Number Publication Date
EP0263689A1 true EP0263689A1 (fr) 1988-04-13

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ID=25848228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870308876 Withdrawn EP0263689A1 (fr) 1986-10-07 1987-10-07 Tête d'application de fluide

Country Status (2)

Country Link
EP (1) EP0263689A1 (fr)
AU (1) AU7942787A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621136A2 (fr) * 1993-04-19 1994-10-26 Xerox Corporation Dispositif d'entretien par essuyage humide imprimante par jet d'encre
US5790146A (en) * 1995-12-04 1998-08-04 Xerox Corporation Fluid applicator for maintenance of liquid ink printers
US6224185B1 (en) 1998-10-09 2001-05-01 Eastman Kodak Company Cleaning fluid for inkjet printers
US6726304B2 (en) 1998-10-09 2004-04-27 Eastman Kodak Company Cleaning and repairing fluid for printhead cleaning
CN111097642A (zh) * 2020-01-19 2020-05-05 广州荟园机械科技有限公司 一种长条板材清洁喷涂装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020109A1 (de) * 1979-05-26 1980-11-27 Ricoh Kk Farbstrahldrucker
DE3203014A1 (de) * 1981-02-04 1982-08-12 Sanyo Denki K.K., Moriguchi, Osaka Tintenstrahldrucker und tintentropfenausstossvorrichtung sowie verfahren zur verhinderung ihres verstopfens durch tinte
GB2094180A (en) * 1981-03-06 1982-09-15 Sealed Air Corp Cleaning assembly for a foam dispensing apparatus
DE3604373A1 (de) * 1985-02-13 1986-08-14 Sharp K.K., Osaka Vorrichtung zur verhinderung von duesenverstopfungen bei tintenstrahldruckern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020109A1 (de) * 1979-05-26 1980-11-27 Ricoh Kk Farbstrahldrucker
DE3203014A1 (de) * 1981-02-04 1982-08-12 Sanyo Denki K.K., Moriguchi, Osaka Tintenstrahldrucker und tintentropfenausstossvorrichtung sowie verfahren zur verhinderung ihres verstopfens durch tinte
GB2094180A (en) * 1981-03-06 1982-09-15 Sealed Air Corp Cleaning assembly for a foam dispensing apparatus
DE3604373A1 (de) * 1985-02-13 1986-08-14 Sharp K.K., Osaka Vorrichtung zur verhinderung von duesenverstopfungen bei tintenstrahldruckern

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621136A2 (fr) * 1993-04-19 1994-10-26 Xerox Corporation Dispositif d'entretien par essuyage humide imprimante par jet d'encre
EP0621136A3 (fr) * 1993-04-19 1994-12-14 Xerox Corp Dispositif d'entretien par essuyage humide imprimante par jet d'encre.
US5790146A (en) * 1995-12-04 1998-08-04 Xerox Corporation Fluid applicator for maintenance of liquid ink printers
US6224185B1 (en) 1998-10-09 2001-05-01 Eastman Kodak Company Cleaning fluid for inkjet printers
US6726304B2 (en) 1998-10-09 2004-04-27 Eastman Kodak Company Cleaning and repairing fluid for printhead cleaning
CN111097642A (zh) * 2020-01-19 2020-05-05 广州荟园机械科技有限公司 一种长条板材清洁喷涂装置
CN111097642B (zh) * 2020-01-19 2021-02-09 广州荟园机械科技有限公司 一种长条板材清洁喷涂装置

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