EP0063902A1 - Tintenstrahldrucker - Google Patents

Tintenstrahldrucker Download PDF

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Publication number
EP0063902A1
EP0063902A1 EP82301962A EP82301962A EP0063902A1 EP 0063902 A1 EP0063902 A1 EP 0063902A1 EP 82301962 A EP82301962 A EP 82301962A EP 82301962 A EP82301962 A EP 82301962A EP 0063902 A1 EP0063902 A1 EP 0063902A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
housings
adjacent
printing machine
machine according
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.)
Granted
Application number
EP82301962A
Other languages
English (en)
French (fr)
Other versions
EP0063902B1 (de
Inventor
John R. Debesis
Bertil S. Sultan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/255,017 external-priority patent/US4377814A/en
Priority claimed from US06/305,583 external-priority patent/US4390886A/en
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of EP0063902A1 publication Critical patent/EP0063902A1/de
Application granted granted Critical
Publication of EP0063902B1 publication Critical patent/EP0063902B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof

Definitions

  • This invention relates generally to an ink jet printing machine, and more particularly concerns isolating adjacent ink jet nozzles from one another to prevent interaction therebetween.
  • an ink jet printing machine has an array of small nozzles with each nozzle having a chamber containing ink associated therewith.
  • an electromechanical transducer varies the volume of the chamber producing a temporary increase in pressure forcing a droplet of ink to be ejected from the corresponding nozzle.
  • These individual droplets of ink are sprayed onto a copy sheet.
  • One column of vertical drops is referred to as a scan. If, in forming a character, a particular space in a scan is to be left blank, the transducer associated with the appropriate nozzle remains de-energized and a droplet of ink is not ejected from the nozzle. Thus, drops of ink are deposited in appropriate positions on the copy sheet to form the desired character.
  • U.S. Patent No. 4032929 discloses a multiple nozzle unit having an ink supply chamber. A piezoelectric layer is excited to deform or decrease the volume of the respective chamber to cause a droplet of ink to be ejected from the nozzle.
  • U.S. Patent No. 4057807 describes an ink jet assembly in which excitation of an electromagnet deforms a diaphram to decrease the volume of an ink chamber. Decreasing the volume of the chamber causes ink to be ejected from a nozzle in communication therewith.
  • U.S. Patent No. 4243995 describes an ink jet recording system in which a piezoelectric transducer is positioned partially in the ink channel. The piezoelectric transducer expands when excited acting like a piston to eject ink from the nozzle.
  • An ink jet printing machine is characterised by an array of nozzles, means for storing a supply of writing fluid for each nozzle of said array of nozzles, means for energizing selected nozzles of said array of nozzles to eject spaced droplets of writing fluid therefrom, and means for isolating the nozzles of said array of nozzles from one another to prevent interaction between said nozzles from energizing nozzles other than the selected nozzles of said array of nozzles.
  • Ink jet module 10 arranged to eject droplets of writing fluid or ink therefrom.
  • Ink jet module 10 includes a nozzle 12 in communication with tube 14 in housing 16.
  • An inlet portion 18 of tube 14 is connected to a supply of writing ink.
  • a piezoelectric transducer 20 is positioned closely adjacent tube 14. Piezoelectric transducer 20 is encapsulated in an elastomeric material such as urethane 22.
  • An electric voltage pulse generator (not shown) is connected to piezoelectric transducer 20 by electrical lead wire 24.
  • Rectangular recessed portions 28 are formed in housing 16 to define slots between adjacent ink jet modules. These slots are preferably filled with air so as to reduce cross coupling between adjacent ink jet modules.
  • these slots may be filled with a liquid. All of the recessed portions are preferably about the same volume. In this manner, each recessed portion is one half of the volume of the slot separating adjacent ink jet modules. Excitation of piezoelectric tranducer 20 causes tube 14 to be compressed or restricted in size. In this way, a droplet of ink or writing fluid is ejected from nozzle 12.
  • piezoelectric transducer 20 is made from piezoceramic PZT-5, available from Vernitron Piezoelectric Division, Bedford, Ohio, U.S.A.
  • Housing 16 is preferably formed by casting a plastic material, such as urethane. Piezoelectric transducer 20 is at least partially secured to housing 16. Nozzle 12 is also secured to housing 16.
  • a linear array of ink jet modules are formed by placing each ink jet module of Figure 2 adjacent to another. As depicted thereat, the recessed portions 28 of adjacent ink jet modules are aligned with one another to define slots therebetween. In this way, adjacent ink jet assemblies are isolated from one another. This is achieved by the air spaces in the slots between adjacent modules. The air between adjacent ink jet modules acts as a damping medium to insure that surface to surface contact, between adjacent ink jet modules, is minimized. Hence, when one of the ink jet modules is actuated by energizing a selected piezoelectric transducer, adjacent ink jet modules remain de-activated, i.e.
  • slots are air filled, but the slots may be filled with any suitable fluid or visco-elastic damping medium, including a liquid.
  • FIG. 4 another embodiment of a linear array of ink jet modules is formed.
  • corrugated plates 29 are arranged between the modules.
  • the plates may be formed with the sides of the modules or arranged in the recesses 28.
  • adjacent ink jet assemblies are isolated from one another. This is achieved by the corrugations forming air spaces between adjacent modules.
  • the air between adjacent ink jet modules acts as a damping medium.
  • the corrugations insure that there is no surface to surface contact between adjacent ink jet modules, but rather a plurality of point contacts.
  • adjacent ink jet modules remain de-activated, i.e. there is no cross coupling between the adjacent ink jet modules or interaction therebetween due to the isolation provided by corrugated plates 29.
  • a wall 30 of plate 29 intersects with a wall 32 thereof at an apex 34.
  • a plurality of apexes of a plate of one module contact the apexes of the plate of the next adjacent ink jet module.
  • each plate 29 is a corrugated member comprising a series of triangular members connected to one another.
  • the axis formed by the apexes of one plate 29 are substantially normal in direction to the axis formed by apexes of the next adjacent plate. In this way, a series of multiplicity of point contacts between adjacent ink jet modules occur rather than surface or area contact therebetween. Air is interposed between adjacent ink jet modules to provide damping therebetween.
  • wall 30 intersects wall 32 of each plate 29 at a 90° angle at apex 34.
  • Figure 6(a) depicts one embodiment of the relationship between adjacent plates 29. As shown thereat, all of the walls 30 and 32 of each plate 29 intersect at the same angle at apex 34. As previously indicated, this angle is preferably 90°. Under these circumstances, all of the apexes 34 of one wall 29 will contact a!l of the apexes of the next adjacent wall.
  • walls 30 and 32 may intersect one another at apexes 34 at different angles or the walls may be of different lengths.
  • a plurality of apexes 34 will be spaced from the next adjacent plate 29.
  • only periodic apexes 34 will contact the next adjacent plate 29.
  • the greater damping is introduced by the increase in air between adjacent plates 29.
  • the contact between adjacent plates 29 is greatly reduced in that contact will occur only periodically along discreet points rather than at each apex as is shown in Figure 5(a).
  • plates 29 have been depicted herein as being corrugated, other configurations may be employed.
  • any plate having a plurality of protuberances extending outwardly therefrom may function to isolate adjacent ink jet modules from one another.
  • These protuberances could be dimples, grooves, creases, or any other such arrangement.
  • the ink jet printing machine of the present invention includes a linear array of nozzles with adjacent nozzles being isolated from one another to prevent interaction therebetween when a selected nozzle is energized. Isolation of adjacent nozzles is achieved by interposing a damping medium therebetween. This damping medium is disposed in slots between adjacent nozzles and tends to prevent cross coupling. In this way, interaction is minimized and only the selected nozzle will be energized rather than both the selected nozzle and adjacent nozzles.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP19820301962 1981-04-17 1982-04-16 Tintenstrahldrucker Expired EP0063902B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US255017 1981-04-17
US06/255,017 US4377814A (en) 1981-04-17 1981-04-17 Ink jet printing machine
US06/305,583 US4390886A (en) 1981-09-25 1981-09-25 Ink jet printing machine
US305583 1981-09-25

Publications (2)

Publication Number Publication Date
EP0063902A1 true EP0063902A1 (de) 1982-11-03
EP0063902B1 EP0063902B1 (de) 1985-06-26

Family

ID=26944382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820301962 Expired EP0063902B1 (de) 1981-04-17 1982-04-16 Tintenstrahldrucker

Country Status (2)

Country Link
EP (1) EP0063902B1 (de)
DE (1) DE3264403D1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032929A (en) * 1975-10-28 1977-06-28 Xerox Corporation High density linear array ink jet assembly
US4243995A (en) * 1979-06-01 1981-01-06 Xerox Corporation Encapsulated piezoelectric pressure pulse drop ejector apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032929A (en) * 1975-10-28 1977-06-28 Xerox Corporation High density linear array ink jet assembly
US4243995A (en) * 1979-06-01 1981-01-06 Xerox Corporation Encapsulated piezoelectric pressure pulse drop ejector apparatus

Also Published As

Publication number Publication date
EP0063902B1 (de) 1985-06-26
DE3264403D1 (en) 1985-08-01

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