GB2226793A - Varying nozzle array geometry in ink jet printheads - Google Patents
Varying nozzle array geometry in ink jet printheads Download PDFInfo
- Publication number
- GB2226793A GB2226793A GB8927937A GB8927937A GB2226793A GB 2226793 A GB2226793 A GB 2226793A GB 8927937 A GB8927937 A GB 8927937A GB 8927937 A GB8927937 A GB 8927937A GB 2226793 A GB2226793 A GB 2226793A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nozzle
- support member
- bores
- nozzles
- assembly
- 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- Withdrawn
Links
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
- B41J2/135—Nozzles
- B41J2/145—Arrangement thereof
-
- 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
-
- 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
- B41J2202/19—Assembling head units
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
At least some of the jets in a printhead array are of a unitary kind in which the nozzle orifice is provided at the tip of a removably mounted ink delivery tube, whereby these nozzles may be selectively mounted at any of a number of possible locations in a nozzle-plate. As shown (Fig 1) the nozzle orifices are provided by apertures in inserts (5) located in the tips of the tubes (4), and the tubes are mounted to the nozzle-plate (1). In an alternative, the nozzles are mounted in a mounting-channel and separated by flanges whereby the array is linear but the separations between nozzles is selectable (e.g. by selective orientation of the flanges, which may be assymetric). <IMAGE>
Description
TITLE: DEVICE AND METHOD
The present invention relates to a devi.ce, notably to a means whereby a nozzle plate for an ink jet printer with selectable positioning of the nozzles and pitch spacings between nozzles can be achieved; and to a method for fabricating such a nozzle plate.
BACKGROUND TO THE INVENTION:
Drop on demand non-contact droplet applicators, for example i.nk jet printers, comprise an array of nozzles through which droplets of i.nk or other fluid are ejected onto a substrate moving substantially normal with respect to the li.ne of travel of the droplets from the nozzle orifices. Usually the nozzle array is stati.onary and the substrate travels past the array.
The droplets are ejected by operating mechanisms, for example a transducer to flex a wall of a chamber communicating witch the. nozzle, or a solenoid valve in a line for feeding ink under pressure to the nozzle. These means control the flow of fluid through each of the nozzle orifices in the desired sequence so that the droplets are laid down on the substrate in the desi.red pattern to form the required image, e.g. to apply adhesive to the desi.red area of a carton, or to apply a bar code or an alphanumeric symbol to a package or a sheet of paper.
In most designs of such applicators, the nozzles orifices are provided by jewels having a bore there through which are fixedly mounted in a bore extending through a metal or other nozzle plate. Fluid is fed to the bore in the plate from the flow controlling mechanism by a capi.llary tube or conduit.
Each print head usually requires a specific nozzle plate assembly wi.th the nozzles set into the bores at the desired pitch or spacing from one another. Thi.s requires a manufacturer to hold a large inventory of different nozzle plate assemblies and imposes restrictions on the end user in that he must purchase a new nozzle plate assembly if he wishes to alter the positioning or spacing of the nozzle outlets on the pri.nt head.
It has been proposed in PCT Application No 87/01657 to provide means for varying the hei.ght of the character printed by a print head by varying the pitch between the nozzles. The nozzles are fixedly mounted within an add-on nozzle plate assembly in which a moving plate having splayed slots is moved between a pair of fixed plates each havi.ng a si.ngle vertical slot, the nozzles being journalled through the apertures at the points of intersection of the slots. The nozzles are connected to the outlet tubes of the flow control valves i.n a conventional print head.When the splayed plate is moved sideways, the nozzles are moved up or down the vertical slots with the upper and lower nozzles being moved more than those at the centre so as to maintain uniform spacing of the nozzles within the array.
Such a device is directed to varying the height of the image to be printed and the nozzles are secured within the nozzle plate .and are moved as a group. The device requires the manufacturer to hold a separate sub-assembly i.n place of the conventi.onal nozzle plate and does not give the user the freedom to configure the nozzle plate as he wishes.
It has also- been proposed in US Patent 4215350 to form a nozzle plate wi.th a row of nozzles in two porti.ons, the upper porti.on havi.ng a larger spacing between the nozzles, the lower portion having a smaller spacing between the nozzles.
Switching means feeds ink to the upper section and some of the lower section to pri.nt a tall image at the larger nozzle spaci.ng; or feeds i.nk to the lower section to print a lower image at the smaller nozzle spacing. The nozzles in this assembly are fi.xed in the nozzle plate and no variation of the spacing of the nozzles other than that set by the bores in the nozzle plate is possible. Furthermore, such a constructi.on requires the use of a number of valves which may not be used in some configurations of the nozzle plate and this adds to the costs of the nozzle plate assembly.
We have now devised a form of nozzle and nozzle plate assembly which enables a user to configure the assembled plate to suit his requi.rements and reduces the number of items a manufacturer has to hold i.n stock. Furthermore, the assembly of the invention enables a single nozzle which has been damaged or blocked to be removed for service or repair without replacing the whole nozzle plate assembly as has been required hitherto.
SUMMARY OF THE INVENTION:
Accordi.ngly, the present invendon provides a nozzle plate assembly which comprises a support member member having a plurality of bores therethrough in association with a plurality of nozzles, notably jewel nozzle orifice, characterised in that at least some of the nozzles are carried at or adjacent the end of a tubular support member adapted to convey fluid to and through the nozzle orifice, the tubular support members being adapted to be i.ndi.vidually removably mountable in individually selected ones of said bores in the said support member whereby the position and spaci.ng between the nozzle orifices in the assembled nozzle plate assembly can be individually selected.
The invention further provides a nozzle plate assembly having the tubular support members removably mounted within individually selected ones of the said bores to provide a nozzle array having the nozzle orifi.ces in the desired position and at the desired spacing in sai.d support member.
The invention further provi.des a method for assembling a nozzle plate which comprises inserting tubular support members of an assembly of the invention into individually selected bores in the sai.d support member to form a nozzle plate havi.ng the nozzle orifices at the desired position and spacing in sai.d support member.
The invention yet further provi.des a method for altering the posi.ti.on and/or the spacing of the nozzle orifices i.n an assembled nozzle plate assembly of the invention which method compri.ses removi.ng selected tubular support members and their associated nozzles from bores i.n sai.d support member and inserting some or all of said tubular support members and their associ.ated nozzles in individually selected other bores in said support member.
In the present invention the nozzles are carried by support tubes which can be inserted and removed from the bores in the support member (whi.ch will for convenience be referred to hereinafter as the nozzle plate member) so that a large range of nozzle configurations can be assembled from two standard components, the nozzle plate member and the nozzle/tubular support members. This enables a manufacturer to hold a much reduced inventory of parts whilst retai.ni.ng the ability to supply a wi.de range of configurations of assembled nozzle plates.
The i.nventi.on also enables a user to re-configure the position and/or spaci.ng of some or all of the nozzle orifices in a nozzle plate assembly merely by removing the individual nozzle/tubular support members from the bores in the nozzle plate member and re-i.nserti.ng some or all of them in the bores i.n the plate member required for the new configuration. The user can thus vary his nozzle plate configuration without the need to purchase a new nozzle plate assembly. The invention also enables a single nozzle orifice to be removed if it becomes blocked or damaged without the need to replace the whole nozzle plate assembly.
The invention is characterised i.n that the nozzle orifice are carried by tubular support members which are removably mounted in the bores in the nozzle plate member. This is in contrast to present nozzle plate assemblies where the nozzle orifices are permanently secured wi.thi.n the bores and cannot readily be removed and replaced. Furthermore, the nozzle plate for use in the present invention has more bores therethrough than would usually be required for any one nozzle plate configuration and we believe that such nozzle plates are novel.
The present invention also provides a nozzle plate for use i.n the nozzle plate assembly of the invention characterised in that i.t has at least two series of bores therethrough, the spacing between the bores in one series being different from those in another of said series.
In a particularly preferred form of the nozzle plate, there are provided two substantially parallel rows of bores in which the spacings between the bores in the rows are different. The plate may also carry means whereby the tubular support members carrying the nozzles, notably jewel nozzles, can be secured in position within the bores.
DESCRIPTION OF THE DRAWINGS:
To ai.d understanding of the invention, i.t will be described wi.th respect to a preferred embodi.ment and with respect to the accompanying drawings in which Figure 1 is a di.agrammati.c vertical cross-section through an assembled nozzle plate assembly- of the invention, Figure 2 is a plan view of the nozzle plate; Figure 3 is- a plan view of an alternative plate to that shown in Figure 2; and Figures 4 and 5 are diagrammati.s cros-secti.ons through alternative forms of construction for the nozzle plate.
DESCRIPTION OF THE PREFERRED EMBODIMENT:
The nozzle plate assembly of the invention comprises a nozzle support member 1 which forms the nozzle plate member. This can be an integral part of the mai.n assembly of the print head and can therefore have a wide range of shapes. However, it will usually be preferred to provi.de the nozzle support member as a generally planar member which i.s demountable from the print head and for convenience the invention will be described hereinafter in terms of a demountable generally planar nozzle plate which is screwed, bolted or otherwise secured to the main body or framework of the pri.nt head in the conventional manner.
The nozzle plate 1 i.s provi.ded with a number of bores 2 there through. These bores can be simple transverse cylindrical bores or can be more complex i.n shape. If desired, the bores can have a stepped configuration, an inward circumferential shoulder or radi.ally inwardly projecting ribs and the like to provide an internal stop agai.nst which the tubular support member seats when in position as described below. Thus, a particularly preferred form of bore i.s a cylindrical bore havi.ng an annular flange 3 at or adjacent the outward face of the plate agai.nst which the jewel orifice end of the tubular support buts when in position.
The bores 2 are preferably lai.d out i.n one or more rows havi.ng a uniform or irregular spacing between the bores so that the nozzle array formed by mounting the tubular support members therein can have the desired spaci.ng and position options.
Thus, as shown in Figure 2, the bores 2 can be laid out along a single axial line extending along the longitudinal axis of the plate with the bores uniformly spaced at the smallest pitch spacing required in an assembled nozzle plate. However, it wi.ll usually be preferred that the bores be laid out along two or more substantially parallel lines having different spacings between the bores as shown in Figure 3, since this will enable a wide range of nozzle spacings in the assembled plate to be achieved.
The plate 1 i.s conveniently made from a metal or plastic and the bores 2 are formed by a suitable drilling operation or by casting or moulding techniques.
The nozzle orifice to be mounted in the bores 2 of plate 1 are provided in the form of tubular members 4 carryi.ng at or adjacent the ends thereof a nozzle 5, which is preferably a jewel nozzle. The jewel nozzle 5 can be of conventional design and construction, eg. a synthetic saphire or ruby, with a fi.ne bore therethrough, and commercially avai.lable forms of jewel nozzlecan be used in the present invention.
The tubular support members 4 can be conventional neoprene or similar tubes as used as fluid feed lines in a conventional i.nk jet printer head. Alternatively, as shown in Figure 1, the nozzle 5- can be mounted in the end of a rigid metal or similar capillary tube 4 which i.s then a push or other fit into the i.nk line 6 for feeding ink from the flow control mechani.sm to the jewel orifice 5.
The nozzle 5 i.s secured in the tubular support member 4 by any sui.table means, for example by being a push fit within the bore of the tubular support member 4, by shri.nki.ng the member upon the nozzle, by external clamping means or by a suitable adhesive, for example an epoxy resin.
The tubular support member 4 is removably mounted within the bore 2 in the plate 1. This can be achieved by making the tubular support member a sliding or push fi.t within the bore 2. Alternatively, the tubular support 4 can be provided wi.th a bayonet, screw of other mounti.ng whereby i.t i.s secured to the plate.
In order that the nozzles perform i.n a substantially uniform manner within each bore 2, it is preferred to provide means for locati.ng the tubular support member 4 uniformly within the bores 2. This can take the form of the annular shoulder 3 adjacent the outer end of the bore so that the tubular support member 4 seats agai.nst that shoulder to locate the nozzle 5 a given distance from the outer or exposed face of the nozzle plate 1.
Alternatively, the tubular support member 4 can carry means which engage wi.th the inner face of the plate 1 adjacent the entry to bore 2 and which may also serve to secure the tubular support member within the bore. Thus, the tubular support member 4 can carry an external radial shoulder 7 or series of projections which engage wi.th the face of the plate 1. The tubular support member 4 carri.es a screw cap 8 which engages a corresponding screw threaded upstand 9 around the entry to bore 2 so that the shoulder 7 is trapped between the cap 8 and the plate 1 when the cap 8 is screwed home to secure the tubular support member 4 in positi.on.Other forms of securing means, for example a spri.ng cli.p, or a securing clamp strip retaining several tubes, may be used if desired.
The tubular support member 4 is connected to an ink line 6 by which ink or other fluid is fed from a reservoir to the nozzle orifice 5 as wi.th a conventional ink jet printer design and construction. Thus, the line 6 can connect the tubular support member 4 to a chamber of a transducer type of ink dispenser in which the volume of the chamber is reduced upon operati.on of the transducer to eject ink through the jewel orifice. However, the invention is of especial application to drop on demand ink jet printers in which the flow of fluid through the orifice 5 is controlled by the operation of a valve 10 located in the li.ne 6 between the member 4 and a reservoi.r 11 of ink under pressure.Typically, the valve will be a solenoid valve operated under the control of a conventional computer control system (not shown).
It is preferred that the valve 10, the line 6, the tubular support 4 and the orifice 5 form an integral unit. This can be tested as a unit during manufacture so that the manufacturer can offer units with tested and substantially uniform operating characteristics. In this way a user can replace damaged or defective uni.ts in an existing nozzle plate assembly without the need for re-cali.brati.ng the repaired assembly. Alternatively, the user can hold a stock of such tested units to enable hi.m to vary and i.ncrease the number of nozzle orifices in an existing nozzle plate assembly if he so desires.The ability to offer replacement valve and/or nozzle units without the need to replace the whole nozzle plate assembly is not feasi.ble with existing designs of nozzle plate assembly.
Apart from the nozzle plate 1, the tubular support and its orifice 5, the print head can be of conventional design as used in an ink jet printer, and can be operated in the conventional manner.
The nozzle plate assembly of the invention is readily assembled by inserting the tubular support members 4 i.nto the required bores 2 i.n plate 1 and securi.ng them in position, if required. The bores 2 are selected to achieve the desired positioning of the nozzle orifices in the plate. Thus, the nozzle orifices can be located close to the edge of the plate using bores al to a7 as shown in Figure 2, or in the centre of the plate using bores a12 to al8 as shown in Figure 2 or elsewhere to the choice of the operator. With the conventional forms of nozzle plate, this choice of location is not feasible.The spacing between the nozzles can be selected, for example by using every other bore as shown in
Figure 3, or by using bores from alternating rows of bores, eg. by usi.ng four adjacent bores from row A and four adjacent bores from row B i.n Figure 3.
If a nozzle becomes damaged or blocked, since the tubular support member 4 carrying i.ts orifice 5 is removably mounted in plate 1, the operator merely replaces that nozzle/tubular support unit as a whole, preferably by replacing the li.ne 6 and valve 10 as well as an integral unit as described above.
Where the operator wishes to alter the configuration of the nozzles in the nozzle plate, thi.s can readily be done by removi.ng the requi.red nozzle/tubular support uni.ts from the bores and re-i.nserti.ng them in other bores as required to achieve the desired new configuration.
The invention has been descri.bed above in terms of mounting the nozzle/support tube units i.n bores in a solid unitary nozzle plate. However, it will be appreciated that the nozzle plate could be formed in an number of other forms of construction and need not be a soli.d body.
For example, the nozzle plate could be formed by assembling individual support blocks each carrying one or more nozzle/support tube units in a support frame or carriage.
Thus, as shown in Figures 4 and 5, each tubular support 4 could be formed with a squared or rectangular external cross-section or could carry a square or rectangular radi.al collar 20 in place of the shoulder 7 shown in Figure 1. Such tubular support members can be fitted transversely into a longitudinal support channel 21 or other support framework so that the nozzle orifices are directed substantially normally to the longitudinal axis of the channel 21 or other support framework. A string of such tubular support members 4 can thus be assembled extending along the channel to form an array of nozzles spaced apart by the width of the collars or the tubular support members.By forming the collars or tubular support members with a rectangular plan shape, rotation of the collars or tubular support members through 90* wi.ll vary the spacing between the nozzle orifices in such a string.
The nozzles for use in invention are preferably conventional jewel nozzles as used in ink jet printers. However, other forms of nozzle, for example stainless steel, ceramic or other nozzles may be used.
Thus, in i.ts broadest embodiment the present invention provides a plurality of nozzle orifice units characterised in that at least some of the orifice units comprise a nozzle orifice carried at or adjacent the end of a tubular support member adapted to convey fluid to and through the nozzle orifice; and a support member adapted to receive and demountably support said nozzle orifice units i.n individually selected posi.tions on said support member at individually selected spacing between said nozzle orifice units.
Claims (7)
1. A nozzle assembly comprising a plurali.ty of nozzle orifice units characterised in that at least some of the orifice units comprise a nozzle orifice carried at or adjacent the end of a tubular support member adapted to convey fluid to and through the nozzle orifice; and a support member adapted to receive and demountably support said nozzle orifice units in individually selected positions on said support member at individually selected spacing between said nozzle orifice units.
2. A nozzle assembly as clai.med in claim 1 for use in a non-contact fluid applicator devi.ce, which assembly compri.ses a support member having a plurali.ty of bores therethrough i.n associ.ation with a plurality of nozzles, characterised in that at least some of the nozzles are carried at or adjacent the end of a tubular support member adapted to convey fluid to and through the nozzle orifice, the tubular support members being adapted to be individually removably mountable in individually selected ones of said bores in the sai.d support member whereby the posi.tion and spacing between the nozzle orifices in the assembled nozzle plate assembly can be individually selected.
3. An i.ntegral nozzle/valve uni.t for use in an assembly as claimed in clai.m 1 wherein each unit comprises a tubular support member having mounted thereon a jewel orifice nozzle and connected to a valve means for controlling the flow of fluid through sai.d nozzle orifice means.
4. A nozzle plate for use as the support member i.n the nozzle assembly of claim 1 characterised in that it has at least two seri.es of bores therethrough, the spacing between the bores in one series being different from those in another of said series.
5. An assembly as clai.med in claim 2 wherei.n means are provided whereby the tubular support members carryi.ng the nozzles can be secured i.n posidon within the bores.
6. An assembly as claimed in claim 1 wherein each tubular support i.s formed with a squared or rectangular external cross-section or carries a square or rectangular radi.al collar whereby the tubular support members can be fi.tted transversely into a longitudinally extending support means so that the nozzle orifices carried by the tubular supports are directed substantially normally to the longi.tudinal axi.s of the support means and whereby an array of nozzles spaced apart by the width of the collars or the tubular support members i.s assembled.
7. A method for alteri.ng the position and/or the spacing of the nozzle orifices i.n an assembled nozzle plate assembly as claimed i.n claim 2, which method comprises removing selected tubular support members and their associated nozzles from bores in said support member and inserdng some or all of said tubular support members and their associ.ated nozzles i.n individually selected other bores i.n said support member.
7. A drop on demand i.nk jet printer wherein the nozzles through which the i.nk i.s to be ejected are provided by an assembly as clai.med in claim 1.
8. A method for assembli.ng a. nozzle plate which comprises inserting the tubular support members of an assembly as claimed in claim 2 j.nto individually selected bores in the sai.d support member to form a nozzle plate having the nozzle orifices at the desired position and spaci.ng in said support member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB888829255A GB8829255D0 (en) | 1988-12-15 | 1988-12-15 | Device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8927937D0 GB8927937D0 (en) | 1990-02-14 |
| GB2226793A true GB2226793A (en) | 1990-07-11 |
Family
ID=10648528
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB888829255A Pending GB8829255D0 (en) | 1988-12-15 | 1988-12-15 | Device and method |
| GB8927937A Withdrawn GB2226793A (en) | 1988-12-15 | 1989-12-11 | Varying nozzle array geometry in ink jet printheads |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB888829255A Pending GB8829255D0 (en) | 1988-12-15 | 1988-12-15 | Device and method |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8829255D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994008794A1 (en) * | 1992-10-16 | 1994-04-28 | Willett International Limited | Method for assembling devices |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539569A (en) * | 1982-10-26 | 1985-09-03 | Canon Kabushiki Kaisha | Ink jet recording apparatus |
-
1988
- 1988-12-15 GB GB888829255A patent/GB8829255D0/en active Pending
-
1989
- 1989-12-11 GB GB8927937A patent/GB2226793A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539569A (en) * | 1982-10-26 | 1985-09-03 | Canon Kabushiki Kaisha | Ink jet recording apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994008794A1 (en) * | 1992-10-16 | 1994-04-28 | Willett International Limited | Method for assembling devices |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8829255D0 (en) | 1989-01-25 |
| GB8927937D0 (en) | 1990-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |