CA2203952A1 - Brazing process for a continuous ink jet printhead - Google Patents
Brazing process for a continuous ink jet printheadInfo
- Publication number
- CA2203952A1 CA2203952A1 CA 2203952 CA2203952A CA2203952A1 CA 2203952 A1 CA2203952 A1 CA 2203952A1 CA 2203952 CA2203952 CA 2203952 CA 2203952 A CA2203952 A CA 2203952A CA 2203952 A1 CA2203952 A1 CA 2203952A1
- Authority
- CA
- Canada
- Prior art keywords
- resonator
- resonator body
- ink jet
- jet printhead
- fluid
- 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.)
- Abandoned
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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/025—Ink jet characterised by the jet generation process generating a continuous ink jet by vibration
-
- 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
- B41J2202/22—Manufacturing print heads
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
A brazing process is provided for joining machined resonator portions to yield a single resonator body for a continuous ink jet printhead. A
first resonator body portion and a second resonator body portion are provided, each resonator portion having partial fluid ingress, fluid egress, and nozzle plate channel fluid cavities. A braze preform is then insertable between the first and second resonator body portions to join the first and second resonator body portions. Alignment pins secure and align the first resonator body portion to the second resonator body portion.
first resonator body portion and a second resonator body portion are provided, each resonator portion having partial fluid ingress, fluid egress, and nozzle plate channel fluid cavities. A braze preform is then insertable between the first and second resonator body portions to join the first and second resonator body portions. Alignment pins secure and align the first resonator body portion to the second resonator body portion.
Description
CA 022039~2 1997-04-29 BRAZING PROCESS FOR A
CONTINUOUS INK JET PRINTHEAD
Technical Field The present invention relates to continuous ink jet printers and, more particularly, to a brazing process for joining machined resonator portions to yield a single resonator body for a continuous ink jet printhead Backqround Art Ink jet printing systems are known in which a printhead defines one or more rows of orifices which receive an electrically conductive recording fluid from a pressurized fluid supply manifold and eject the fluid in rows of parallel streams. Printers using such printheads accomplish graphic reproduction by selectively charging and deflecting the drops in each of the streams and depositing at least some of the drops on a print receiving medium, while others of the drops strike a drop catcher device.
Droplet generators are one of the major components in a continuous ink jet printhead. Droplet generators often use a nozzle plate attached to a resonant body to stimulate the j ets . In a resonator body design where the inlet and outlet ports are not directly in line with the nozzle plate channel, machining from a solid metal block is essentially impossible.
It is seen then that it would be desirable to eliminate the problems associated with the prior art resonator body design by providing a resonator body design which is particularly useful where the inlet and outlet ports are not directly in line with the nozzle plate channel CA 022039~2 l997-04-29 SummarY of the Invention This need is met by the system according to the present invention, wherein the resonator body of a continuous ink jet printhead is fabricated from S two precision machined halves which are brazed together in a process to yield an integral unit. The integral unit comprises the inlet and outlet f luid ports as well as the fluid channel which directs the fluid into the bonded nozzle plate In accordance with one aspect of the present invention, a brazing process is provided for joining machined resonator portions to yield a single resonator body for a continuous ink jet printhead. A
first resonator body portion and a second resonator body portion are provided, each resonator portion having partial fluid ingress, fluid egress, and nozzle plate channel fluid cavities. A braze preform is then insertable between the f irst and second resonator body portions to join the first and second resonator body portions. Alignment pins secure and align the first resonator body portion to the second resonator body port ion .
Accordingly, it is an object of the present invention to yield a single resonator body for a continuous ink jet printhead. It is a further object of the present invention to provide a resonator body design where the inlet and outlet ports are not directly in line with the nozzle plate channel. It is an advantage of the present invention that it provides a viable resonator body design which addresses the packaging constraints of some printheads.
Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and the 3 5 appended c 1 a ims .
CA 022039~2 1997-04-29 Brief Description of the Drawinqs Fig. lA is a partially cutaway view illustrating two joined halves forming a resonator body in accordance with the present invention;
Fig. lB is a view along section line B-B
of Fig. lA;
Fig. 2 illustrates a brazed foil-resonator preform used to braze the two resonator halves into the single resonator body of Fig. lA; and Fig. 3 is a side view of a brazing alignment pin used in the joining of the two resonator halves .
Detailed Description of the Preferred Embodiments The present invention provides brazing process whereby two machined resonator halves are brazed together in a manner that yields a single resonator body for a continuous ink jet printhead. In co-pending, commonly assigned patent application Serial No. 08/640,180 (docket number SDP163PA), totally incorporated herein by reference, a top feed droplet generator assembly is disclosed, which has an integral f luid cavity wherein f luid ingress and egress to and from the resonator body is on the side of the resonator body opposite the nozzle plate. The brazing process according to the present invention is particularly useful when used to join two resonator halves into the top feed droplet generator described and claimed in co-pending, commonly assigned patent application Serial No.
08/640 ,180 (docket number SDP163PA) .
Referring now to the drawings, in Fig. lA
there is illustrated a partially cutaway view of two resonator halves joined to form a resonator body in accordance with the present invention; and in Fig. lB
CA 022039~2 1997-04-29 there is illustrated a front section view of one of the resonator halves. The resonator is a top feed resonator, wherein inlet and outlet ports are located at the top of the resonator body and communicate with a nozzle plate channel located at the bottom of the resonator body Resonator 1 comprises f luid ingress and egress on a surface 7 opposite nozzle plate 2. A
counterbore 3 feature permits an effective means to secure fittings 6 to the droplet generator 1. A fluid passage 4 allows fluid to travel from an ingress point 8 down to the nozzle plate 2. A narrow fluid trench 5 redirects fluid flow from the fluid passage 4 to an in-line direction with the nozzles (not shown) lS associated with nozzle plate 2. Since fluid passage 4 is not directly in line with the nozzle plate channel, machining from a solid metal block is impractical and, essentially, impossible.
To provide such a design using machining, the present invention proposes a two piece resonator design, wherein two pieces lA and lB are brazed together to form a single resonator. Each symmetrically machined portion lA and lB preferably comprises half of inlet 8, outlet 9 and nozzle plate 2 channel fluid cavity. For a continuous ink. jet printhead design, the resonator body 1 is fabricated from the two precision machined portions lA and lB
which are brazed together to yield an integral unit.
The integral unit comprises the inlet 8 and outlet 9 fluid ports and the fluid channel 4 which directs the fluid into the bonded nozzle plate 2. After brazing, a complete resonator body 1 with properly sized fluid channels is achieved.
In the prior art, such as a one inch, 120 drops per inch ink jet printer resonator body, the CA 022039~2 l997-04-29 fluid channels can be machined in one portion of the resonator body, with the second resonator portion being a solid cover. A rectangular braze foil material without fluid channel cutouts was placed S between the two halves, with the fluid cavity half being placed on top to avoid flow of the braze foil into the f luid channels .
In a one inch, 240 drops per inch printing system, each resonator portion lA and lB comprises part of the inlet 8, the outlet 9 and the nozzle plate 2 channel fluid cavity. With two fluid channel symmetrical halves, there is a greater chance for thin, rectangular braze foil to flow into the fluid channels, especially if a solid braze foil, i.e., one without fluid channel cutouts, is used.
Braze material in the fluid cavities is undesirable for several reasons One, braze material that has melted and solidified presents a rough, almost grit blasted appearance, which can be a source of fluid flow disturbances and can create sites for air bubble attachment. Either of these problems can severely affect the resonator body performance. Also, the added nonsymmetrical mass due to the excess braze foil in one of the portions lA or lB may be another source of poor resonator body performance.
In an effort to greatly reduce the amount of braze material which can flow into the fluid channels, a braze foil preform 10, as shown in Fig. 2, is used. By the proper, standard mechanical use of brazing alignment pins 11, as illustrated in Fig. 3, insertable into apertures 12 of Fig. 2, the two portions lA and lB can be accurately aligned. In a preferred embodiment of the present invention, the pins 11 are machined from round stock and have break edges 14 at each end, to provide relief for ease of CA 022039~2 1997-04-29 insertion into apertures 12. Preferably, one of the resonator sections lA or lB, has alignment apertures designed for a press fit; while the other resonator portion lB or lA, has alignment apertures designed for a slip fit.
The braze preform 10 of the present invention comprises fluid channel cutout 13. The preform shape allows for 5 to 15 mils of overhang into the fluid channels for tolerancing and to ensure adequate braze coverage at the melt temperature. With the insertion of the braze preform 10, the resulting resonator body 1 minimizes braze material in the fluid channels as the preform melts when the braze temperature is applied. This reduces poor resonator performance attributed to the existence of braze material. In a preferred embodiment of the present invention, the pins 11 are of the same material as the resonator portions lA and lB, to eliminate differences in thermal expansion at the braze temperature. If thermal expansion rates differ between the pin 11 and the resonator portions lA and lB, the upper resonator portions would "hang" up, when the upper resonator portion is actually required to float during the brazing process to obtain perfect braze integrity.
Industrial AP,olicabilitY and Advant aqe s The present invention is useful in the field of ink jet printing, and has the advantage of addressing packaging constraints of certain printheads. The present invention provides the further advantage of providing an integral resonator body by brazing two separate resonator body portions.
Finally, the present invention provides the advantage of minimizing braze material in the fluid channels.
CA 022039~2 1997-04-29 Having descrlbed the invention in detail and by reference to the preferred embodiment thereof, it will be apparent that other modifications and variations are possible without departing from the scope of the invention defined in the appended claims
CONTINUOUS INK JET PRINTHEAD
Technical Field The present invention relates to continuous ink jet printers and, more particularly, to a brazing process for joining machined resonator portions to yield a single resonator body for a continuous ink jet printhead Backqround Art Ink jet printing systems are known in which a printhead defines one or more rows of orifices which receive an electrically conductive recording fluid from a pressurized fluid supply manifold and eject the fluid in rows of parallel streams. Printers using such printheads accomplish graphic reproduction by selectively charging and deflecting the drops in each of the streams and depositing at least some of the drops on a print receiving medium, while others of the drops strike a drop catcher device.
Droplet generators are one of the major components in a continuous ink jet printhead. Droplet generators often use a nozzle plate attached to a resonant body to stimulate the j ets . In a resonator body design where the inlet and outlet ports are not directly in line with the nozzle plate channel, machining from a solid metal block is essentially impossible.
It is seen then that it would be desirable to eliminate the problems associated with the prior art resonator body design by providing a resonator body design which is particularly useful where the inlet and outlet ports are not directly in line with the nozzle plate channel CA 022039~2 l997-04-29 SummarY of the Invention This need is met by the system according to the present invention, wherein the resonator body of a continuous ink jet printhead is fabricated from S two precision machined halves which are brazed together in a process to yield an integral unit. The integral unit comprises the inlet and outlet f luid ports as well as the fluid channel which directs the fluid into the bonded nozzle plate In accordance with one aspect of the present invention, a brazing process is provided for joining machined resonator portions to yield a single resonator body for a continuous ink jet printhead. A
first resonator body portion and a second resonator body portion are provided, each resonator portion having partial fluid ingress, fluid egress, and nozzle plate channel fluid cavities. A braze preform is then insertable between the f irst and second resonator body portions to join the first and second resonator body portions. Alignment pins secure and align the first resonator body portion to the second resonator body port ion .
Accordingly, it is an object of the present invention to yield a single resonator body for a continuous ink jet printhead. It is a further object of the present invention to provide a resonator body design where the inlet and outlet ports are not directly in line with the nozzle plate channel. It is an advantage of the present invention that it provides a viable resonator body design which addresses the packaging constraints of some printheads.
Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and the 3 5 appended c 1 a ims .
CA 022039~2 1997-04-29 Brief Description of the Drawinqs Fig. lA is a partially cutaway view illustrating two joined halves forming a resonator body in accordance with the present invention;
Fig. lB is a view along section line B-B
of Fig. lA;
Fig. 2 illustrates a brazed foil-resonator preform used to braze the two resonator halves into the single resonator body of Fig. lA; and Fig. 3 is a side view of a brazing alignment pin used in the joining of the two resonator halves .
Detailed Description of the Preferred Embodiments The present invention provides brazing process whereby two machined resonator halves are brazed together in a manner that yields a single resonator body for a continuous ink jet printhead. In co-pending, commonly assigned patent application Serial No. 08/640,180 (docket number SDP163PA), totally incorporated herein by reference, a top feed droplet generator assembly is disclosed, which has an integral f luid cavity wherein f luid ingress and egress to and from the resonator body is on the side of the resonator body opposite the nozzle plate. The brazing process according to the present invention is particularly useful when used to join two resonator halves into the top feed droplet generator described and claimed in co-pending, commonly assigned patent application Serial No.
08/640 ,180 (docket number SDP163PA) .
Referring now to the drawings, in Fig. lA
there is illustrated a partially cutaway view of two resonator halves joined to form a resonator body in accordance with the present invention; and in Fig. lB
CA 022039~2 1997-04-29 there is illustrated a front section view of one of the resonator halves. The resonator is a top feed resonator, wherein inlet and outlet ports are located at the top of the resonator body and communicate with a nozzle plate channel located at the bottom of the resonator body Resonator 1 comprises f luid ingress and egress on a surface 7 opposite nozzle plate 2. A
counterbore 3 feature permits an effective means to secure fittings 6 to the droplet generator 1. A fluid passage 4 allows fluid to travel from an ingress point 8 down to the nozzle plate 2. A narrow fluid trench 5 redirects fluid flow from the fluid passage 4 to an in-line direction with the nozzles (not shown) lS associated with nozzle plate 2. Since fluid passage 4 is not directly in line with the nozzle plate channel, machining from a solid metal block is impractical and, essentially, impossible.
To provide such a design using machining, the present invention proposes a two piece resonator design, wherein two pieces lA and lB are brazed together to form a single resonator. Each symmetrically machined portion lA and lB preferably comprises half of inlet 8, outlet 9 and nozzle plate 2 channel fluid cavity. For a continuous ink. jet printhead design, the resonator body 1 is fabricated from the two precision machined portions lA and lB
which are brazed together to yield an integral unit.
The integral unit comprises the inlet 8 and outlet 9 fluid ports and the fluid channel 4 which directs the fluid into the bonded nozzle plate 2. After brazing, a complete resonator body 1 with properly sized fluid channels is achieved.
In the prior art, such as a one inch, 120 drops per inch ink jet printer resonator body, the CA 022039~2 l997-04-29 fluid channels can be machined in one portion of the resonator body, with the second resonator portion being a solid cover. A rectangular braze foil material without fluid channel cutouts was placed S between the two halves, with the fluid cavity half being placed on top to avoid flow of the braze foil into the f luid channels .
In a one inch, 240 drops per inch printing system, each resonator portion lA and lB comprises part of the inlet 8, the outlet 9 and the nozzle plate 2 channel fluid cavity. With two fluid channel symmetrical halves, there is a greater chance for thin, rectangular braze foil to flow into the fluid channels, especially if a solid braze foil, i.e., one without fluid channel cutouts, is used.
Braze material in the fluid cavities is undesirable for several reasons One, braze material that has melted and solidified presents a rough, almost grit blasted appearance, which can be a source of fluid flow disturbances and can create sites for air bubble attachment. Either of these problems can severely affect the resonator body performance. Also, the added nonsymmetrical mass due to the excess braze foil in one of the portions lA or lB may be another source of poor resonator body performance.
In an effort to greatly reduce the amount of braze material which can flow into the fluid channels, a braze foil preform 10, as shown in Fig. 2, is used. By the proper, standard mechanical use of brazing alignment pins 11, as illustrated in Fig. 3, insertable into apertures 12 of Fig. 2, the two portions lA and lB can be accurately aligned. In a preferred embodiment of the present invention, the pins 11 are machined from round stock and have break edges 14 at each end, to provide relief for ease of CA 022039~2 1997-04-29 insertion into apertures 12. Preferably, one of the resonator sections lA or lB, has alignment apertures designed for a press fit; while the other resonator portion lB or lA, has alignment apertures designed for a slip fit.
The braze preform 10 of the present invention comprises fluid channel cutout 13. The preform shape allows for 5 to 15 mils of overhang into the fluid channels for tolerancing and to ensure adequate braze coverage at the melt temperature. With the insertion of the braze preform 10, the resulting resonator body 1 minimizes braze material in the fluid channels as the preform melts when the braze temperature is applied. This reduces poor resonator performance attributed to the existence of braze material. In a preferred embodiment of the present invention, the pins 11 are of the same material as the resonator portions lA and lB, to eliminate differences in thermal expansion at the braze temperature. If thermal expansion rates differ between the pin 11 and the resonator portions lA and lB, the upper resonator portions would "hang" up, when the upper resonator portion is actually required to float during the brazing process to obtain perfect braze integrity.
Industrial AP,olicabilitY and Advant aqe s The present invention is useful in the field of ink jet printing, and has the advantage of addressing packaging constraints of certain printheads. The present invention provides the further advantage of providing an integral resonator body by brazing two separate resonator body portions.
Finally, the present invention provides the advantage of minimizing braze material in the fluid channels.
CA 022039~2 1997-04-29 Having descrlbed the invention in detail and by reference to the preferred embodiment thereof, it will be apparent that other modifications and variations are possible without departing from the scope of the invention defined in the appended claims
Claims (7)
1. A resonator for an ink jet printhead of a continuous ink jet printer, the resonator comprising:
a first resonator body portion and a second resonator body portion, the first and second resonator body portions each having partial fluid ingress, fluid egress, and nozzle plate channel fluid cavities;
a braze preform insertable between the first and second resonator body portions to join the first and second resonator body portions; and at least one alignment pin for securably aligning the first resonator body portion to the second resonator body portion to form a single resonator body.
a first resonator body portion and a second resonator body portion, the first and second resonator body portions each having partial fluid ingress, fluid egress, and nozzle plate channel fluid cavities;
a braze preform insertable between the first and second resonator body portions to join the first and second resonator body portions; and at least one alignment pin for securably aligning the first resonator body portion to the second resonator body portion to form a single resonator body.
2. A resonator for an ink jet printhead as claimed in claim 1 wherein the first and second resonator body portions each comprise one half of the single resonator body.
3. A resonator for an ink jet printhead as claimed in claim 1 wherein the at least one alignment pin is machined from round stock.
4. A resonator for an ink jet printhead as claimed in claim 1 wherein the at least one alignment pin has break edges at each end.
5. A resonator for an ink jet printhead as claimed in claim 1 wherein the at least one alignment pin comprises a first alignment pin and a second alignment pin.
6. A resonator for an ink jet printhead as claimed in claim 1 wherein the at least one alignment pin is comprised of a material identical in thermal expansion to that of the first and second resonator body portions.
7. A resonator for an ink jet printhead as claimed in claim 1 wherein the braze preform comprises a fluid channel cutout section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64006496A | 1996-04-30 | 1996-04-30 | |
| US08/640,064 | 1996-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2203952A1 true CA2203952A1 (en) | 1997-10-30 |
Family
ID=24566705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2203952 Abandoned CA2203952A1 (en) | 1996-04-30 | 1997-04-29 | Brazing process for a continuous ink jet printhead |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0805026B1 (en) |
| JP (1) | JPH1034937A (en) |
| CA (1) | CA2203952A1 (en) |
| DE (1) | DE69702090T2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4032928A (en) * | 1976-08-12 | 1977-06-28 | Recognition Equipment Incorporated | Wideband ink jet modulator |
| US4135197A (en) * | 1977-10-14 | 1979-01-16 | The Mead Corporation | Vibration damping means for ink jet printing device |
| US4354194A (en) * | 1980-11-03 | 1982-10-12 | International Business Machines Corporation | Wideband ink drop generator |
| JPS59146860A (en) * | 1983-02-10 | 1984-08-22 | Matsushita Electric Ind Co Ltd | Ink jet recording head |
| DE69410878T2 (en) * | 1993-05-12 | 1998-10-08 | Scitex Digital Printing Inc | Drop generator with damping means to suppress vibrations |
-
1997
- 1997-04-21 EP EP19970302688 patent/EP0805026B1/en not_active Expired - Lifetime
- 1997-04-21 DE DE1997602090 patent/DE69702090T2/en not_active Expired - Fee Related
- 1997-04-28 JP JP11105497A patent/JPH1034937A/en active Pending
- 1997-04-29 CA CA 2203952 patent/CA2203952A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1034937A (en) | 1998-02-10 |
| EP0805026B1 (en) | 2000-05-24 |
| DE69702090T2 (en) | 2000-12-21 |
| EP0805026A1 (en) | 1997-11-05 |
| AU1993997A (en) | 1997-11-06 |
| DE69702090D1 (en) | 2000-06-29 |
| AU716068B2 (en) | 2000-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |