CA2061425A1 - Valve assembly for ink jet printer - Google Patents
Valve assembly for ink jet printerInfo
- Publication number
- CA2061425A1 CA2061425A1 CA002061425A CA2061425A CA2061425A1 CA 2061425 A1 CA2061425 A1 CA 2061425A1 CA 002061425 A CA002061425 A CA 002061425A CA 2061425 A CA2061425 A CA 2061425A CA 2061425 A1 CA2061425 A1 CA 2061425A1
- Authority
- CA
- Canada
- Prior art keywords
- ink
- housing
- valve
- conduit
- orifice
- 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
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17596—Ink pumps, ink valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—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
Abstract
ABSTRACT
A valve for a drop on demand ink jet printer employ-ing a lever seal in a housing to control the frequency and quantity of ink delivered to a printing material such as paper.
A valve for a drop on demand ink jet printer employ-ing a lever seal in a housing to control the frequency and quantity of ink delivered to a printing material such as paper.
Description
2~ ''5 V~LV~ ~SSEMBLY FOR INR JET PRINTER
The present invention relates to a valve and print head assembly employed in a ~drop on demand~ ink jet printing device.
BASXGROUND OF ~9oe rNvENTIoN
Numerous drop on demand printing devices, which deliver ink droplets to paper or other material to be marXed, are well known. Such mechanisms include, for example, remote solenoid valves feeding nozzles through a length of tubing, solenoid valves operating at the nozzle, and solenoids operating via flexible or rigid cable. See, for example, U.S. ~atents No.
4,723,131, No. 4,576,111 and No. 4,809,017. ~hese systems produce large drops suitable for large character printing such as that employed on cardboard cartons.
Another example of a prior art valve device is shown in PCT International Publication No. WO 85/01103, published March 14, 1985. In that device, a coil driven magnetic reed operates as a valve for opening an closing an ink chamber, thereby dispensing drops of ink upon actuation of the valve.
Devices such as those described suffer from a number of problems. An important problem related to remote solenoid devices is the low frequency response of the valve/nozzle 2C'~ S
assembly due to slow valve action, causing long filaments of ink to be e~ected from the nozzle. Other problems found in earlier systems include the ingestion of air into the nozzle, causing printing errors, and high power requirements for actuating the solenoid driven valve drivers.
Proximate valve assPmblies, and assemblies employing cables between a solenoid and the ink delivery nozzle have encountered reliability problems. In addition, the high manufacturing costs associated with such ~evices, and low frequency response problems like that described above, have limited the acceptance of such devices.
Another type of valve assembly is used in small character printers (such as document printers). Such devices use the surface tension at the orifice of the nozzle to provide the funct~on of a valve. This surface tension absorbs the recoil of the ink drop to stop leakage from the orifice. A small orifice (typically less than 60 microns) must be used, and the surface tension of the ink must be high, to prevent leakage. Such systems have not proved suitable for large character printers which require larger ink drops.
Another problem found in many of the previously described systems is contact between the ink and the valve actuating device. In systems where such contact is permitted, 2~ ~5 the composition of the ink is required to be non-corrosive to limit the damage caused by such contact.
S~MMARY OF T~E INVENTION
The present invention overcomes the problems found in previous ink ~et delivery systems by providing a corrosion resistant valve in which the ink is isolated from the actuating devices such as solenoids. A relatively high frequency response is produced as a result of simple mechanical linkages actuatins the valve. In addition, the valve is simple to construct, and each valve may be readily combined with other valves to produce a print head array capable of generating large or small characters.
Moreover, since the utility of the valve is not l;m;ted to a small orifice size or to ink having a high surface tension, drop size may be varied to obtain the desired printing effect with few structural limitations.
,~
Thu~, the present invention provides a valve assembly for a drop on demand ink ~et printer comprising a housing defining an ink chamber, in which a conduit for e~ecting ink from the valve is formed in the housing and ends in an orifice in the housing wall. A lever is pivotally connected to the housing, which lever has an interior end disposed in the ink cham~er. The lever includes a means for sealing and unsealing the conduit, so that ink ~s e~ected when the conduit is unsealed.
, ~ ~ , , ~ , ' ' ` ' ' ' ' 2~ ,5 The present invention also relates to a print head assem~led from a plurality of such valves spaced apart from one another such that the array of ~alves may be employed to print a pattern corresponding to an alphanumeric or other character or graphic design.
B~IEF DESC~IPTION OF q~E DRANINGS
FIG. 1 shows a sectional view of the valve of the present invention.
FIG. 2 is a partial perspective view of the valve, showing two optional modifications of the valve to enhance stability and operation.
FIG. 3 shows a front view of a plurality of such valves assembled into a print head according to the present invention.
FIG. 4 shows a plurality of valves assembled into an array for printing characters, in accord with the present invent1on.
2 ~ A; ~ 5 DETAILED DESC~IPTION OF T9~ INVENTION
Referring to FIG. 1, a valve 5 is provided that include~ an actuating lever 10 flexibly connected to the housing 20 at neck portions 30. Lever 10, housing 20 and neck 30 are prefer~bly an integral assem~ly that is made from a suitable material, such as plastic, corrosion re~istant metal or epoxy, which permits the le~er to rotate in response to force applied at the external end. For ease of manufacture, this assembly is preferably made from in~ection molded plastic; it may, however, be die cut, etched, laser cut, or made by any other means. Neck portions 30 are notched or molded into housing 20, and are of such dimensions as to permit rotation of lever ~ C~ ~f ;)q~
As shown in FIG. 2, lever 10 may optionally be pro~ided with a fulcrum pin 40 along the rotational axis of lever 10 to impart stability at the point a~out which rotation occurs.
Alternatively, a pin 45 may be inserted along the longitudinal axis of lever 10 to impart rigidity along the length of the lever, thereby ensuring that displacement of the outside end of lever 10 results in similar displacement of the inside end of lever 10. A pin having both horizontal and vertical components may also be molded ln place at the intersection of lever 10 and neck portions 30. Such a longitudinal pin would be at least long enough to pass from the exterior end of the lever 10 to beyond the rotational axis of lever 10.
~'.6. ' ' ' ' '' .
' .
, "'. ` ' ' ' , ~ .
.
:. , " ' ;~r~ 5 Returnin~ to FIG. 1, lever 10 may be fitted with a seal 35 at its end disposed inside housing 20. This seal preferably is made of an elastomer, but may be made of any ink-re~istant material that will provide a good seal when ink flow is not desired.
Housing 20 is provided with a conduit 60, which is preferably an integral assembly with housing 20. Conduit 60 includes bore 70 to permit ink to flow out through the valve via orifice 80. Lever 10 and conduit 60 are disposed such that seal 35 rests snugly on a valve seat 90 formed on the end of conduit 60 when the lever is not displaced therefrom.
In use, upon actuation by an external device 15, such as a ~olenoid, cable, mechanical linkage, pneumatic, hydraulic, or piezoelectric means, lever 10 pivots about its rotational axis. For ex~mple, a solenoid may be operably connected, by mechanical, adhesive or other means, to the end of lever 10 disposed outside the valve. When delivery of ink from the valve ~s re~uired, the solenoid may be actuated to move lever 10 downwardly. This downward motion on the exterior portion of the lever causes the interior portion to be raised, unsealing the conduit 60.
~.~...
2~ 5 Upon actuation of le~er 10, ink, flows through tho valve under pressure (typically, but not necessarily, at or below 10 psi, and preferably below 5 psi) and exits the valve through conduit 60 and orifice 80. The pressure head may be supplied by a pump or by a pressurized ink cartridge, or by other means.
Bore 70 may optionally be fitted with an insert, such as a metal or ceramic tube and~or a ~eweled orifice to enhance the flow of ink through the conduit.
It is important to note that this operation is different from the operation of conventional valves. In conventional devices, ink is released by the valve as a consequence of mechanical displacement. For example, the valve may take the form of a flexible membrane as shown in U.S. Patents No. 4,383,264 and No. 4,723,131. In such valves, a membrane is flexed to puQh ink through an orifice, and retracted to permit additional ink to be received for printing upon the next fle~ure.
The present invention does not employ such a technique. Instead, the ink ch~mber is under substantially constant pressure. When conduit 60 is unsealed, ink flows out in response to such pr ssure. Immediately thereafter, reseating of the seal 35 on conduit 60 term~nates ink flow, resulting in the formation of an individual drop.
; ~:
~ ~ 8 .
..... .... . . .
,' ." .,' - ~
.
ti~,5 ~ The stream of ink exiting orifice ~0 forms a drop which trave~ to the substrate to be marked. In combination, such dots for~ patterns corresponding to letterq, numkers, symbols, or graphic designs and patterns. The size of the dot will depend upon drop size, which is a function of the amount of time the seal is unseated, the ink pressure, the ink composition and the orifice size. It is understood by thosë,;in t ~ ar~/that the adjustment of such variables will be dependent upon the Lmage to be printed, and that they may be readily determined from available data.
In an ideal setting, the ink pressure forces a cylinder of ink out of the orifice 80 when the valve seal i~ opened, terminating upon the reseating of seal 35. The actual effect of the clo~ing of the valve is to produce a teardrop-shaped ink drop a~ a result of the varying celerity C of the ink in the cylinder.
The volume of this drop for an orifice of diameter D may be calculated as follows:
~l~d~'4D~L (I) wherein the length of the cylinder L iS equal to t~e average celerity C of the ink multiplied by the time T over which the valve ~eal is open. Substituting these values for L, Equation I
may therefore be rewritten as:
~......
s V~~ r~4L~CT (II) Since the volume of the drop is roughly equal to the volume of the cylinder, the volume of ink in the drop may adequately be represented by Equation II.
The time T over which the seal is open, may be controlled using electronic apparatus, with an increase in time resulting in a change of fluid cylinder length and concomitantly ink drop volume. The celerity C of the ink will vary as a function of ink pressure; thus, as the ink pressure is increased, the celerity of the ink increases, as does the size of the drop.
Ad~ustment of these two variables, along with the ink ~iscosity ~h~ pwh ~l. ~J i~V~r a~ r~pn~l~nal ~-J-c~ler~ ~, may be made to produce drops of the desired size. Typical variables will be as set forth in Table I.
TABLE I
Orifice Size: 120-300 ~
Ink Pres~ure: 3-5 psi Celerity: 300-600 cm/s Time: 1 ms ; Vi~cosit~: 1.5-5 c~
:
, 10 - -' -.
2~ 5 Housing 20 is closed on four ends, but open on both sides to receive ink under pressure from 2 common supply. An assembly of a plurality of such valves form a print head as shown in FIG. 3. To accomplish such an assembly, mountin~ holes 50 (shown in FIG. 1) are provided in housing 20 to permit linkage of a plurality of valves.
FIG. 3 shows a plurality of valves 5 assembled as an array 160 contemplated by the invention. The valves are ~oined to one another via connection pins 110. Each valve is separated from an ad~acent valve by a spacer 120 and a gasket 130. The spacers are preferably made from a rigid material, such as metal or rigid plastic, while the gaskets are preferably made from a resilient material such as an elastomer. It may also be des$rable to combine the spacers and gaskets into a single component. Holes are provided ln each spacer and gasket to permit the connector pins 110 to extend through them. The valve assembly of FIG. 3 also includes end plates 140 to seal the sides of the valve~ at each end of the print head, thereby defining an enclo~ed ink chamber. A gasket 130 is preferably placed between each end plate 140 and its ad~acent valve S to provide a seal.
End plates 140 also include inlet and bleed ports 150 to permit 1OW of ink, under pressure, into and out of the valve assembly.
,, .
Spacers 120 are sized to provide sufficient distance between the valve~ that ink flowing through the crifice of each valve produces a dot on the printing material that is separate and distinct from dots produced by other valves in the assembly.
At the same time, the valves will not ordinarily be spaced so far apart as to produce patterns of dots that cannot be seen to form a character or symbol by the ordinary observer.
The num~er of valves used in the assembly as shown in FIG. 3 should be sufficient to form the desired image size when printed. Among the factors to be considered in this determination are the size of orifice 80, the corresponding dot size printed on the paper, the type and viscosity of the ink used, and the characteristics of the desired image. ~hose skilled in the art are readily able to make this determination.
For example, an assem~ly of seven valves would produce a ~ingle line of a seven-dot high printing matrix, as shown in FIG. 4. Additional valves may be employed to produce multiple lines of characters or larger characters. a~ a show~ ln ~ cs 3~ ~jjr, ~, .. . .. ....
2r ~ 1 ~"~;
The present invention has been described with respect to certain embodiments and conditions, which are not meant to and should not be construed to limit the invention. Those skilled in the art will understand that variations from the ~mhodiments and conditions described herein may be made without departing from the invention as claimed in the appended claims.
The present invention relates to a valve and print head assembly employed in a ~drop on demand~ ink jet printing device.
BASXGROUND OF ~9oe rNvENTIoN
Numerous drop on demand printing devices, which deliver ink droplets to paper or other material to be marXed, are well known. Such mechanisms include, for example, remote solenoid valves feeding nozzles through a length of tubing, solenoid valves operating at the nozzle, and solenoids operating via flexible or rigid cable. See, for example, U.S. ~atents No.
4,723,131, No. 4,576,111 and No. 4,809,017. ~hese systems produce large drops suitable for large character printing such as that employed on cardboard cartons.
Another example of a prior art valve device is shown in PCT International Publication No. WO 85/01103, published March 14, 1985. In that device, a coil driven magnetic reed operates as a valve for opening an closing an ink chamber, thereby dispensing drops of ink upon actuation of the valve.
Devices such as those described suffer from a number of problems. An important problem related to remote solenoid devices is the low frequency response of the valve/nozzle 2C'~ S
assembly due to slow valve action, causing long filaments of ink to be e~ected from the nozzle. Other problems found in earlier systems include the ingestion of air into the nozzle, causing printing errors, and high power requirements for actuating the solenoid driven valve drivers.
Proximate valve assPmblies, and assemblies employing cables between a solenoid and the ink delivery nozzle have encountered reliability problems. In addition, the high manufacturing costs associated with such ~evices, and low frequency response problems like that described above, have limited the acceptance of such devices.
Another type of valve assembly is used in small character printers (such as document printers). Such devices use the surface tension at the orifice of the nozzle to provide the funct~on of a valve. This surface tension absorbs the recoil of the ink drop to stop leakage from the orifice. A small orifice (typically less than 60 microns) must be used, and the surface tension of the ink must be high, to prevent leakage. Such systems have not proved suitable for large character printers which require larger ink drops.
Another problem found in many of the previously described systems is contact between the ink and the valve actuating device. In systems where such contact is permitted, 2~ ~5 the composition of the ink is required to be non-corrosive to limit the damage caused by such contact.
S~MMARY OF T~E INVENTION
The present invention overcomes the problems found in previous ink ~et delivery systems by providing a corrosion resistant valve in which the ink is isolated from the actuating devices such as solenoids. A relatively high frequency response is produced as a result of simple mechanical linkages actuatins the valve. In addition, the valve is simple to construct, and each valve may be readily combined with other valves to produce a print head array capable of generating large or small characters.
Moreover, since the utility of the valve is not l;m;ted to a small orifice size or to ink having a high surface tension, drop size may be varied to obtain the desired printing effect with few structural limitations.
,~
Thu~, the present invention provides a valve assembly for a drop on demand ink ~et printer comprising a housing defining an ink chamber, in which a conduit for e~ecting ink from the valve is formed in the housing and ends in an orifice in the housing wall. A lever is pivotally connected to the housing, which lever has an interior end disposed in the ink cham~er. The lever includes a means for sealing and unsealing the conduit, so that ink ~s e~ected when the conduit is unsealed.
, ~ ~ , , ~ , ' ' ` ' ' ' ' 2~ ,5 The present invention also relates to a print head assem~led from a plurality of such valves spaced apart from one another such that the array of ~alves may be employed to print a pattern corresponding to an alphanumeric or other character or graphic design.
B~IEF DESC~IPTION OF q~E DRANINGS
FIG. 1 shows a sectional view of the valve of the present invention.
FIG. 2 is a partial perspective view of the valve, showing two optional modifications of the valve to enhance stability and operation.
FIG. 3 shows a front view of a plurality of such valves assembled into a print head according to the present invention.
FIG. 4 shows a plurality of valves assembled into an array for printing characters, in accord with the present invent1on.
2 ~ A; ~ 5 DETAILED DESC~IPTION OF T9~ INVENTION
Referring to FIG. 1, a valve 5 is provided that include~ an actuating lever 10 flexibly connected to the housing 20 at neck portions 30. Lever 10, housing 20 and neck 30 are prefer~bly an integral assem~ly that is made from a suitable material, such as plastic, corrosion re~istant metal or epoxy, which permits the le~er to rotate in response to force applied at the external end. For ease of manufacture, this assembly is preferably made from in~ection molded plastic; it may, however, be die cut, etched, laser cut, or made by any other means. Neck portions 30 are notched or molded into housing 20, and are of such dimensions as to permit rotation of lever ~ C~ ~f ;)q~
As shown in FIG. 2, lever 10 may optionally be pro~ided with a fulcrum pin 40 along the rotational axis of lever 10 to impart stability at the point a~out which rotation occurs.
Alternatively, a pin 45 may be inserted along the longitudinal axis of lever 10 to impart rigidity along the length of the lever, thereby ensuring that displacement of the outside end of lever 10 results in similar displacement of the inside end of lever 10. A pin having both horizontal and vertical components may also be molded ln place at the intersection of lever 10 and neck portions 30. Such a longitudinal pin would be at least long enough to pass from the exterior end of the lever 10 to beyond the rotational axis of lever 10.
~'.6. ' ' ' ' '' .
' .
, "'. ` ' ' ' , ~ .
.
:. , " ' ;~r~ 5 Returnin~ to FIG. 1, lever 10 may be fitted with a seal 35 at its end disposed inside housing 20. This seal preferably is made of an elastomer, but may be made of any ink-re~istant material that will provide a good seal when ink flow is not desired.
Housing 20 is provided with a conduit 60, which is preferably an integral assembly with housing 20. Conduit 60 includes bore 70 to permit ink to flow out through the valve via orifice 80. Lever 10 and conduit 60 are disposed such that seal 35 rests snugly on a valve seat 90 formed on the end of conduit 60 when the lever is not displaced therefrom.
In use, upon actuation by an external device 15, such as a ~olenoid, cable, mechanical linkage, pneumatic, hydraulic, or piezoelectric means, lever 10 pivots about its rotational axis. For ex~mple, a solenoid may be operably connected, by mechanical, adhesive or other means, to the end of lever 10 disposed outside the valve. When delivery of ink from the valve ~s re~uired, the solenoid may be actuated to move lever 10 downwardly. This downward motion on the exterior portion of the lever causes the interior portion to be raised, unsealing the conduit 60.
~.~...
2~ 5 Upon actuation of le~er 10, ink, flows through tho valve under pressure (typically, but not necessarily, at or below 10 psi, and preferably below 5 psi) and exits the valve through conduit 60 and orifice 80. The pressure head may be supplied by a pump or by a pressurized ink cartridge, or by other means.
Bore 70 may optionally be fitted with an insert, such as a metal or ceramic tube and~or a ~eweled orifice to enhance the flow of ink through the conduit.
It is important to note that this operation is different from the operation of conventional valves. In conventional devices, ink is released by the valve as a consequence of mechanical displacement. For example, the valve may take the form of a flexible membrane as shown in U.S. Patents No. 4,383,264 and No. 4,723,131. In such valves, a membrane is flexed to puQh ink through an orifice, and retracted to permit additional ink to be received for printing upon the next fle~ure.
The present invention does not employ such a technique. Instead, the ink ch~mber is under substantially constant pressure. When conduit 60 is unsealed, ink flows out in response to such pr ssure. Immediately thereafter, reseating of the seal 35 on conduit 60 term~nates ink flow, resulting in the formation of an individual drop.
; ~:
~ ~ 8 .
..... .... . . .
,' ." .,' - ~
.
ti~,5 ~ The stream of ink exiting orifice ~0 forms a drop which trave~ to the substrate to be marked. In combination, such dots for~ patterns corresponding to letterq, numkers, symbols, or graphic designs and patterns. The size of the dot will depend upon drop size, which is a function of the amount of time the seal is unseated, the ink pressure, the ink composition and the orifice size. It is understood by thosë,;in t ~ ar~/that the adjustment of such variables will be dependent upon the Lmage to be printed, and that they may be readily determined from available data.
In an ideal setting, the ink pressure forces a cylinder of ink out of the orifice 80 when the valve seal i~ opened, terminating upon the reseating of seal 35. The actual effect of the clo~ing of the valve is to produce a teardrop-shaped ink drop a~ a result of the varying celerity C of the ink in the cylinder.
The volume of this drop for an orifice of diameter D may be calculated as follows:
~l~d~'4D~L (I) wherein the length of the cylinder L iS equal to t~e average celerity C of the ink multiplied by the time T over which the valve ~eal is open. Substituting these values for L, Equation I
may therefore be rewritten as:
~......
s V~~ r~4L~CT (II) Since the volume of the drop is roughly equal to the volume of the cylinder, the volume of ink in the drop may adequately be represented by Equation II.
The time T over which the seal is open, may be controlled using electronic apparatus, with an increase in time resulting in a change of fluid cylinder length and concomitantly ink drop volume. The celerity C of the ink will vary as a function of ink pressure; thus, as the ink pressure is increased, the celerity of the ink increases, as does the size of the drop.
Ad~ustment of these two variables, along with the ink ~iscosity ~h~ pwh ~l. ~J i~V~r a~ r~pn~l~nal ~-J-c~ler~ ~, may be made to produce drops of the desired size. Typical variables will be as set forth in Table I.
TABLE I
Orifice Size: 120-300 ~
Ink Pres~ure: 3-5 psi Celerity: 300-600 cm/s Time: 1 ms ; Vi~cosit~: 1.5-5 c~
:
, 10 - -' -.
2~ 5 Housing 20 is closed on four ends, but open on both sides to receive ink under pressure from 2 common supply. An assembly of a plurality of such valves form a print head as shown in FIG. 3. To accomplish such an assembly, mountin~ holes 50 (shown in FIG. 1) are provided in housing 20 to permit linkage of a plurality of valves.
FIG. 3 shows a plurality of valves 5 assembled as an array 160 contemplated by the invention. The valves are ~oined to one another via connection pins 110. Each valve is separated from an ad~acent valve by a spacer 120 and a gasket 130. The spacers are preferably made from a rigid material, such as metal or rigid plastic, while the gaskets are preferably made from a resilient material such as an elastomer. It may also be des$rable to combine the spacers and gaskets into a single component. Holes are provided ln each spacer and gasket to permit the connector pins 110 to extend through them. The valve assembly of FIG. 3 also includes end plates 140 to seal the sides of the valve~ at each end of the print head, thereby defining an enclo~ed ink chamber. A gasket 130 is preferably placed between each end plate 140 and its ad~acent valve S to provide a seal.
End plates 140 also include inlet and bleed ports 150 to permit 1OW of ink, under pressure, into and out of the valve assembly.
,, .
Spacers 120 are sized to provide sufficient distance between the valve~ that ink flowing through the crifice of each valve produces a dot on the printing material that is separate and distinct from dots produced by other valves in the assembly.
At the same time, the valves will not ordinarily be spaced so far apart as to produce patterns of dots that cannot be seen to form a character or symbol by the ordinary observer.
The num~er of valves used in the assembly as shown in FIG. 3 should be sufficient to form the desired image size when printed. Among the factors to be considered in this determination are the size of orifice 80, the corresponding dot size printed on the paper, the type and viscosity of the ink used, and the characteristics of the desired image. ~hose skilled in the art are readily able to make this determination.
For example, an assem~ly of seven valves would produce a ~ingle line of a seven-dot high printing matrix, as shown in FIG. 4. Additional valves may be employed to produce multiple lines of characters or larger characters. a~ a show~ ln ~ cs 3~ ~jjr, ~, .. . .. ....
2r ~ 1 ~"~;
The present invention has been described with respect to certain embodiments and conditions, which are not meant to and should not be construed to limit the invention. Those skilled in the art will understand that variations from the ~mhodiments and conditions described herein may be made without departing from the invention as claimed in the appended claims.
Claims (6)
1. A valve element for use in forming a print head comprised of a plurality of such valve elements for a drop on demand ink jet printer comprising:
a) a housing having end walls but no sides defining an internal space for receiving a pressurized ink supply;
b) a conduit formed in an end wall of the housing and having an orifice for permitting ink drops to issue therefrom;
c) an elongated lever arm pivotally secured to an end wall of said housing, said lever arm including: (1) a first end disposed within said housing; (2) a second end extending externally of said housing and (3) means disposed on said first end for sealing said conduit to prevent ink from issuing from said orifice d) means for periodically pivoting said lever arm to unseal said conduit, thereby to permit ink to issue from said orifice.
a) a housing having end walls but no sides defining an internal space for receiving a pressurized ink supply;
b) a conduit formed in an end wall of the housing and having an orifice for permitting ink drops to issue therefrom;
c) an elongated lever arm pivotally secured to an end wall of said housing, said lever arm including: (1) a first end disposed within said housing; (2) a second end extending externally of said housing and (3) means disposed on said first end for sealing said conduit to prevent ink from issuing from said orifice d) means for periodically pivoting said lever arm to unseal said conduit, thereby to permit ink to issue from said orifice.
2. The valve element according to Claim 1 wherein said lever arm is formed as an integral part of said housing end wall.
3. The valve element of Claim 1 wherein said lever arm pivots about the point where it joins the housing end wall, said end wall having a fulcrum pin inserted therein to reinforce the pivot point.
4. The valve element of Claim 1 wherein said conduit further includes an insert to enhance ink flow therethrough.
5. The print head assembly of Claim 4, further including spacing means interposed between the valves, said spacing means including resilient seals to prevent leakage.
6. A print head assembly for a drop on demand ink jet printer comprising:
a) a plurality of valve elements each including:
i) a housing having end walls, but no sides defining an internal space for receiving a pressurized ink supply;
ii) a conduit formed in an end wall of the housing and having an orifice for permitting ink drops to issue therefrom;
iii) an elongated lever arm pivotally secured to an end wall of said housing, said lever arm having a first end disposed within said housing and carrying means for sealing said conduit to prevent ink from issuing from said orifice and a second end extending externally of said housing.
b) end plates disposed at opposite ends of said assembly; said end plates including ports for the inflow or outflow of ink;
c) means for securing said valve elements and end plates together to form a print head assembly with an internal reservoir; and d) actuating means for pivoting selected ones of said lever a to unseal said conduits to permit ink to flow there through, said actuating means being operable independently of one another.
a) a plurality of valve elements each including:
i) a housing having end walls, but no sides defining an internal space for receiving a pressurized ink supply;
ii) a conduit formed in an end wall of the housing and having an orifice for permitting ink drops to issue therefrom;
iii) an elongated lever arm pivotally secured to an end wall of said housing, said lever arm having a first end disposed within said housing and carrying means for sealing said conduit to prevent ink from issuing from said orifice and a second end extending externally of said housing.
b) end plates disposed at opposite ends of said assembly; said end plates including ports for the inflow or outflow of ink;
c) means for securing said valve elements and end plates together to form a print head assembly with an internal reservoir; and d) actuating means for pivoting selected ones of said lever a to unseal said conduits to permit ink to flow there through, said actuating means being operable independently of one another.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US675,987 | 1991-03-26 | ||
US07/675,987 US5126755A (en) | 1991-03-26 | 1991-03-26 | Print head assembly for ink jet printer |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2061425A1 true CA2061425A1 (en) | 1992-09-27 |
Family
ID=24712750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002061425A Abandoned CA2061425A1 (en) | 1991-03-26 | 1992-02-18 | Valve assembly for ink jet printer |
Country Status (6)
Country | Link |
---|---|
US (1) | US5126755A (en) |
EP (1) | EP0506232B1 (en) |
JP (1) | JPH0577442A (en) |
AU (1) | AU641890B2 (en) |
CA (1) | CA2061425A1 (en) |
DE (1) | DE69205469T2 (en) |
Families Citing this family (86)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5314164A (en) * | 1992-07-17 | 1994-05-24 | Mks Instruments, Inc. | Pivotal diaphragm, flow control valve |
GB9302170D0 (en) * | 1993-02-04 | 1993-03-24 | Domino Printing Sciences Plc | Ink jet printer |
US5577091A (en) * | 1994-04-01 | 1996-11-19 | University Of Central Florida | Water laser plasma x-ray point sources |
US5459771A (en) * | 1994-04-01 | 1995-10-17 | University Of Central Florida | Water laser plasma x-ray point source and apparatus |
DE69624884T2 (en) * | 1995-08-22 | 2003-09-11 | Denki Kagaku Kogyo Kk | honeycombs |
US5901425A (en) | 1996-08-27 | 1999-05-11 | Topaz Technologies Inc. | Inkjet print head apparatus |
AUPO799197A0 (en) | 1997-07-15 | 1997-08-07 | Silverbrook Research Pty Ltd | Image processing method and apparatus (ART01) |
US6880918B2 (en) | 1997-07-15 | 2005-04-19 | Silverbrook Research Pty Ltd | Micro-electromechanical device that incorporates a motion-transmitting structure |
US7008046B2 (en) | 1997-07-15 | 2006-03-07 | Silverbrook Research Pty Ltd | Micro-electromechanical liquid ejection device |
US6485123B2 (en) | 1997-07-15 | 2002-11-26 | Silverbrook Research Pty Ltd | Shutter ink jet |
US6540331B2 (en) | 1997-07-15 | 2003-04-01 | Silverbrook Research Pty Ltd | Actuating mechanism which includes a thermal bend actuator |
US7360872B2 (en) | 1997-07-15 | 2008-04-22 | Silverbrook Research Pty Ltd | Inkjet printhead chip with nozzle assemblies incorporating fluidic seals |
US7524026B2 (en) | 1997-07-15 | 2009-04-28 | Silverbrook Research Pty Ltd | Nozzle assembly with heat deflected actuator |
US6746105B2 (en) | 1997-07-15 | 2004-06-08 | Silverbrook Research Pty. Ltd. | Thermally actuated ink jet printing mechanism having a series of thermal actuator units |
AUPP398798A0 (en) | 1998-06-09 | 1998-07-02 | Silverbrook Research Pty Ltd | Image creation method and apparatus (ij43) |
US7303254B2 (en) | 1997-07-15 | 2007-12-04 | Silverbrook Research Pty Ltd | Print assembly for a wide format pagewidth printer |
US7004566B2 (en) | 1997-07-15 | 2006-02-28 | Silverbrook Research Pty Ltd | Inkjet printhead chip that incorporates micro-mechanical lever mechanisms |
US7753463B2 (en) | 1997-07-15 | 2010-07-13 | Silverbrook Research Pty Ltd | Processing of images for high volume pagewidth printing |
US6652052B2 (en) | 1997-07-15 | 2003-11-25 | Silverbrook Research Pty Ltd | Processing of images for high volume pagewidth printing |
US6857724B2 (en) | 1997-07-15 | 2005-02-22 | Silverbrook Research Pty Ltd | Print assembly for a wide format pagewidth printer |
US7434915B2 (en) | 1997-07-15 | 2008-10-14 | Silverbrook Research Pty Ltd | Inkjet printhead chip with a side-by-side nozzle arrangement layout |
US20040130599A1 (en) | 1997-07-15 | 2004-07-08 | Silverbrook Research Pty Ltd | Ink jet printhead with amorphous ceramic chamber |
US6488359B2 (en) | 1997-07-15 | 2002-12-03 | Silverbrook Research Pty Ltd | Ink jet printhead that incorporates through-chip ink ejection nozzle arrangements |
US7011390B2 (en) | 1997-07-15 | 2006-03-14 | Silverbrook Research Pty Ltd | Printing mechanism having wide format printing zone |
US7431446B2 (en) | 1997-07-15 | 2008-10-07 | Silverbrook Research Pty Ltd | Web printing system having media cartridge carousel |
US7401901B2 (en) | 1997-07-15 | 2008-07-22 | Silverbrook Research Pty Ltd | Inkjet printhead having nozzle plate supported by encapsulated photoresist |
US7287836B2 (en) | 1997-07-15 | 2007-10-30 | Sil;Verbrook Research Pty Ltd | Ink jet printhead with circular cross section chamber |
US6527374B2 (en) | 1997-07-15 | 2003-03-04 | Silverbrook Research Pty Ltd | Translation to rotation conversion in an inkjet printhead |
US6471336B2 (en) | 1997-07-15 | 2002-10-29 | Silverbrook Research Pty Ltd. | Nozzle arrangement that incorporates a reversible actuating mechanism |
US7246884B2 (en) | 1997-07-15 | 2007-07-24 | Silverbrook Research Pty Ltd | Inkjet printhead having enclosed inkjet actuators |
US6824251B2 (en) | 1997-07-15 | 2004-11-30 | Silverbrook Research Pty Ltd | Micro-electromechanical assembly that incorporates a covering formation for a micro-electromechanical device |
US6557977B1 (en) | 1997-07-15 | 2003-05-06 | Silverbrook Research Pty Ltd | Shape memory alloy ink jet printing mechanism |
US7784902B2 (en) | 1997-07-15 | 2010-08-31 | Silverbrook Research Pty Ltd | Printhead integrated circuit with more than 10000 nozzles |
US7044584B2 (en) | 1997-07-15 | 2006-05-16 | Silverbrook Research Pty Ltd | Wide format pagewidth inkjet printer |
US6986613B2 (en) | 1997-07-15 | 2006-01-17 | Silverbrook Research Pty Ltd | Keyboard |
US7195339B2 (en) | 1997-07-15 | 2007-03-27 | Silverbrook Research Pty Ltd | Ink jet nozzle assembly with a thermal bend actuator |
US7556356B1 (en) | 1997-07-15 | 2009-07-07 | Silverbrook Research Pty Ltd | Inkjet printhead integrated circuit with ink spread prevention |
US6648453B2 (en) | 1997-07-15 | 2003-11-18 | Silverbrook Research Pty Ltd | Ink jet printhead chip with predetermined micro-electromechanical systems height |
US7465030B2 (en) | 1997-07-15 | 2008-12-16 | Silverbrook Research Pty Ltd | Nozzle arrangement with a magnetic field generator |
US6540332B2 (en) * | 1997-07-15 | 2003-04-01 | Silverbrook Research Pty Ltd | Motion transmitting structure for a nozzle arrangement of a printhead chip for an inkjet printhead |
US6855264B1 (en) | 1997-07-15 | 2005-02-15 | Kia Silverbrook | Method of manufacture of an ink jet printer having a thermal actuator comprising an external coil spring |
US6247792B1 (en) | 1997-07-15 | 2001-06-19 | Silverbrook Research Pty Ltd | PTFE surface shooting shuttered oscillating pressure ink jet printing mechanism |
US7381340B2 (en) | 1997-07-15 | 2008-06-03 | Silverbrook Research Pty Ltd | Ink jet printhead that incorporates an etch stop layer |
US6682174B2 (en) | 1998-03-25 | 2004-01-27 | Silverbrook Research Pty Ltd | Ink jet nozzle arrangement configuration |
US7111925B2 (en) | 1997-07-15 | 2006-09-26 | Silverbrook Research Pty Ltd | Inkjet printhead integrated circuit |
US6927786B2 (en) | 1997-07-15 | 2005-08-09 | Silverbrook Research Pty Ltd | Ink jet nozzle with thermally operable linear expansion actuation mechanism |
US6935724B2 (en) | 1997-07-15 | 2005-08-30 | Silverbrook Research Pty Ltd | Ink jet nozzle having actuator with anchor positioned between nozzle chamber and actuator connection point |
US7468139B2 (en) | 1997-07-15 | 2008-12-23 | Silverbrook Research Pty Ltd | Method of depositing heater material over a photoresist scaffold |
US7131715B2 (en) | 1997-07-15 | 2006-11-07 | Silverbrook Research Pty Ltd | Printhead chip that incorporates micro-mechanical lever mechanisms |
US6916082B2 (en) | 1997-07-15 | 2005-07-12 | Silverbrook Research Pty Ltd | Printing mechanism for a wide format pagewidth inkjet printer |
US6513908B2 (en) | 1997-07-15 | 2003-02-04 | Silverbrook Research Pty Ltd | Pusher actuation in a printhead chip for an inkjet printhead |
JP4160250B2 (en) * | 1997-07-15 | 2008-10-01 | シルバーブルック リサーチ プロプライエタリイ、リミテッド | Thermally operated inkjet |
US6834939B2 (en) | 2002-11-23 | 2004-12-28 | Silverbrook Research Pty Ltd | Micro-electromechanical device that incorporates covering formations for actuators of the device |
US6679584B2 (en) | 1997-07-15 | 2004-01-20 | Silverbrook Research Pty Ltd. | High volume pagewidth printing |
US7207654B2 (en) | 1997-07-15 | 2007-04-24 | Silverbrook Research Pty Ltd | Ink jet with narrow chamber |
US6814429B2 (en) | 1997-07-15 | 2004-11-09 | Silverbrook Research Pty Ltd | Ink jet printhead incorporating a backflow prevention mechanism |
US6672706B2 (en) | 1997-07-15 | 2004-01-06 | Silverbrook Research Pty Ltd | Wide format pagewidth inkjet printer |
US6582059B2 (en) | 1997-07-15 | 2003-06-24 | Silverbrook Research Pty Ltd | Discrete air and nozzle chambers in a printhead chip for an inkjet printhead |
US7022250B2 (en) | 1997-07-15 | 2006-04-04 | Silverbrook Research Pty Ltd | Method of fabricating an ink jet printhead chip with differential expansion actuators |
US6641315B2 (en) | 1997-07-15 | 2003-11-04 | Silverbrook Research Pty Ltd | Keyboard |
AU2005242163B2 (en) * | 1997-07-15 | 2007-05-03 | Zamtec Limited | Nozzle chamber with paddle vane and externally located thermal actuator |
US6712453B2 (en) | 1997-07-15 | 2004-03-30 | Silverbrook Research Pty Ltd. | Ink jet nozzle rim |
US7337532B2 (en) * | 1997-07-15 | 2008-03-04 | Silverbrook Research Pty Ltd | Method of manufacturing micro-electromechanical device having motion-transmitting structure |
AUPP653998A0 (en) | 1998-10-16 | 1998-11-05 | Silverbrook Research Pty Ltd | Micromechanical device and method (ij46B) |
US7246881B2 (en) | 1997-07-15 | 2007-07-24 | Silverbrook Research Pty Ltd | Printhead assembly arrangement for a wide format pagewidth inkjet printer |
US7891767B2 (en) | 1997-07-15 | 2011-02-22 | Silverbrook Research Pty Ltd | Modular self-capping wide format print assembly |
US6652074B2 (en) | 1998-03-25 | 2003-11-25 | Silverbrook Research Pty Ltd | Ink jet nozzle assembly including displaceable ink pusher |
US6886917B2 (en) | 1998-06-09 | 2005-05-03 | Silverbrook Research Pty Ltd | Inkjet printhead nozzle with ribbed wall actuator |
AUPP702098A0 (en) | 1998-11-09 | 1998-12-03 | Silverbrook Research Pty Ltd | Image creation method and apparatus (ART73) |
US7111924B2 (en) | 1998-10-16 | 2006-09-26 | Silverbrook Research Pty Ltd | Inkjet printhead having thermal bend actuator heating element electrically isolated from nozzle chamber ink |
US6831963B2 (en) * | 2000-10-20 | 2004-12-14 | University Of Central Florida | EUV, XUV, and X-Ray wavelength sources created from laser plasma produced from liquid metal solutions |
US6921153B2 (en) | 2000-05-23 | 2005-07-26 | Silverbrook Research Pty Ltd | Liquid displacement assembly including a fluidic sealing structure |
US20040257412A1 (en) * | 2003-06-18 | 2004-12-23 | Anderson James D. | Sealed fluidic interfaces for an ink source regulator for an inkjet printer |
US6817707B1 (en) | 2003-06-18 | 2004-11-16 | Lexmark International, Inc. | Pressure controlled ink jet printhead assembly |
US7147314B2 (en) * | 2003-06-18 | 2006-12-12 | Lexmark International, Inc. | Single piece filtration for an ink jet print head |
US6837577B1 (en) * | 2003-06-18 | 2005-01-04 | Lexmark International, Inc. | Ink source regulator for an inkjet printer |
US6796644B1 (en) | 2003-06-18 | 2004-09-28 | Lexmark International, Inc. | Ink source regulator for an inkjet printer |
US6776478B1 (en) | 2003-06-18 | 2004-08-17 | Lexmark International, Inc. | Ink source regulator for an inkjet printer |
US6786580B1 (en) | 2003-06-18 | 2004-09-07 | Lexmark International, Inc. | Submersible ink source regulator for an inkjet printer |
US7568793B2 (en) * | 2005-10-28 | 2009-08-04 | Hewlett-Packard Development Company, L.P. | Printing fluid control in printing device |
US20120199768A1 (en) * | 2011-02-03 | 2012-08-09 | Love Lonnie J | Mesofluidic digital valve |
WO2019215668A1 (en) | 2018-05-11 | 2019-11-14 | Matthews International Corporation | Micro-valves for use in jetting assemblies |
CN116394655A (en) | 2018-05-11 | 2023-07-07 | 马修斯国际公司 | Systems and methods for sealing micro-valves used in jetting assemblies |
WO2019215672A1 (en) | 2018-05-11 | 2019-11-14 | Matthews International Corporation | Systems and methods for controlling operation of micro-valves for use in jetting assemblies |
US11639057B2 (en) | 2018-05-11 | 2023-05-02 | Matthews International Corporation | Methods of fabricating micro-valves and jetting assemblies including such micro-valves |
BR112020022990A2 (en) | 2018-05-11 | 2021-02-02 | Matthews International Corporation | microvalve and blasting set |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US960757A (en) * | 1908-06-08 | 1910-06-07 | William h nicholas | Electric valve-controller. |
US1392952A (en) * | 1918-06-01 | 1921-10-11 | Crane Co | Magnetically-operated valve |
US3570807A (en) * | 1969-01-14 | 1971-03-16 | Bell Aerospace Corp | Electromechanical control valve |
JPS4836188Y1 (en) * | 1969-05-19 | 1973-10-30 | ||
DE2361762C3 (en) * | 1973-12-12 | 1980-04-17 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Writing device for punctiform selective transfer of liquid color |
DE2511152A1 (en) * | 1975-03-14 | 1976-09-23 | Daimler Benz Ag | ELECTROMAGNETIC CONTROL VALVE, ESPECIALLY FOR AUTOMATICALLY SWITCHING MOTOR VEHICLE TRANSMISSIONS |
US4397336A (en) * | 1980-01-24 | 1983-08-09 | Godfrey Philip D | Control device for hydraulic spool valves |
US4383264A (en) * | 1980-06-18 | 1983-05-10 | Exxon Research And Engineering Co. | Demand drop forming device with interacting transducer and orifice combination |
DE3114224A1 (en) * | 1981-04-08 | 1982-11-04 | Siemens AG, 1000 Berlin und 8000 München | WRITING DEVICE WORKING WITH LIQUID DROPS |
US4462428A (en) * | 1982-02-22 | 1984-07-31 | Bell & Howell Company | Three-way needle valve |
US4450375A (en) * | 1982-11-12 | 1984-05-22 | Kiwi Coders Corporation | Piezoelectric fluid control device |
DE3302617A1 (en) * | 1983-01-27 | 1984-08-02 | Cyklop International Emil Hoffmann KG, 5000 Köln | COLOR SPRAY HEAD |
WO1985001103A1 (en) * | 1983-08-31 | 1985-03-14 | Diagraph Corporation | Ink jet printing apparatus |
US4539570A (en) * | 1983-12-09 | 1985-09-03 | Willett International Limited | Stackable fluid dispensing apparatus |
GB8507688D0 (en) * | 1985-03-25 | 1985-05-01 | Lane International Ltd John | Fluid applicator |
US4739347A (en) * | 1985-07-17 | 1988-04-19 | Ricoh Company, Ltd. | Ink supply system for use in an ink-jet printer |
US4723131A (en) * | 1986-09-12 | 1988-02-02 | Diagraph Corporation | Printhead for ink jet printing apparatus |
GB8700203D0 (en) * | 1987-01-07 | 1987-02-11 | Domino Printing Sciences Plc | Ink jet printing head |
US4823149A (en) * | 1987-03-09 | 1989-04-18 | Dataproducts Corporation | Ink jet apparatus employing plate-like structure |
GB8828046D0 (en) * | 1988-12-01 | 1989-01-05 | Willett Int Ltd | Device & method |
-
1991
- 1991-03-26 US US07/675,987 patent/US5126755A/en not_active Expired - Fee Related
-
1992
- 1992-02-18 CA CA002061425A patent/CA2061425A1/en not_active Abandoned
- 1992-02-25 DE DE69205469T patent/DE69205469T2/en not_active Expired - Fee Related
- 1992-02-25 EP EP92301577A patent/EP0506232B1/en not_active Expired - Lifetime
- 1992-03-12 AU AU12854/92A patent/AU641890B2/en not_active Ceased
- 1992-03-26 JP JP4068477A patent/JPH0577442A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0506232B1 (en) | 1995-10-18 |
DE69205469D1 (en) | 1995-11-23 |
US5126755A (en) | 1992-06-30 |
AU1285492A (en) | 1992-10-01 |
EP0506232A1 (en) | 1992-09-30 |
DE69205469T2 (en) | 1996-04-04 |
JPH0577442A (en) | 1993-03-30 |
AU641890B2 (en) | 1993-09-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2061425A1 (en) | Valve assembly for ink jet printer | |
US4506276A (en) | Ink supply system | |
EP0787587B1 (en) | Ink jet printing device | |
US5040002A (en) | Regulator for ink-jet pens | |
US4234885A (en) | Remote ink valve | |
CA1122642A (en) | Priming apparatus for liquid ink writing instruments | |
US4819009A (en) | Valve and nozzle system for ink jet printing apparatus | |
EP0138322A1 (en) | Ink valve for marking systems | |
JPS62501202A (en) | fluid jet printing device | |
BR9708845A (en) | Ink supply systems for inkjet printheads. | |
DE19757638B4 (en) | ink supply | |
EP0145130B1 (en) | On-demand type ink-jet print head having fluid control means | |
DE602004009990T2 (en) | ink tank | |
EP0436709A4 (en) | Printhead for ink jet printing apparatus | |
US4542390A (en) | Ink jet printer purging device and process | |
US5039997A (en) | Impact-valve printhead for ink jet printing | |
JPS62161544A (en) | Ink supply mechanism of ink jet printer | |
US4422080A (en) | Ink jet printing method and apparatus | |
EP1244553B1 (en) | Fluid dispensing apparatus | |
CA2259397A1 (en) | Valve arrangement for controlling a flow of fluid between two fluid chambers and writing implement provided therewith | |
CN2763042Y (en) | Sealing means used for ink-box for ink-jet printer | |
US6113296A (en) | Valve arrangement for controlling a flow of fluid between two fluid chambers and writing implement provided therewith | |
CA2283666C (en) | Impulse fluid jet apparatus with depriming protection | |
JPS625855A (en) | Ink jet recorder | |
US7097289B2 (en) | Ink delivery apparatus with pressure tuned rolling piston and method of use |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FZDE | Discontinued |