EP0179607A2 - Farbstrahlgerät - Google Patents

Farbstrahlgerät Download PDF

Info

Publication number
EP0179607A2
EP0179607A2 EP85307373A EP85307373A EP0179607A2 EP 0179607 A2 EP0179607 A2 EP 0179607A2 EP 85307373 A EP85307373 A EP 85307373A EP 85307373 A EP85307373 A EP 85307373A EP 0179607 A2 EP0179607 A2 EP 0179607A2
Authority
EP
European Patent Office
Prior art keywords
ink
reservoir
ink jet
thermal conductivity
cal
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
EP85307373A
Other languages
English (en)
French (fr)
Other versions
EP0179607B1 (de
EP0179607A3 (en
Inventor
Thomas William Deyoung
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.)
Ricoh Printing Systems America Inc
Original Assignee
Exxon Research and Engineering Co
Dataproducts 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 US06/661,029 external-priority patent/US4607266A/en
Application filed by Exxon Research and Engineering Co, Dataproducts Corp filed Critical Exxon Research and Engineering Co
Publication of EP0179607A2 publication Critical patent/EP0179607A2/de
Publication of EP0179607A3 publication Critical patent/EP0179607A3/en
Application granted granted Critical
Publication of EP0179607B1 publication Critical patent/EP0179607B1/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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17593—Supplying ink in a solid state

Definitions

  • This invention relates to an ink jet wherein the ink employed within the jet is of the phase change type, which may be referred to as hot melt ink.
  • phase change, or hot melt ink of the type utilized in an ink jet is characteristically solid at room temperature. When heated, the ink will melt to a consistency so as to be jettable.
  • an ink jet apparatus for ejecting droplets of hot melt ink, characterised in that it comprises at least one ink jet including a chamber, an orifice for ejecting hot melt ink in a liquid state from said chamber, and an ink inlet for supply of hot melt ink in a liquid state to said chamber, and heater means for heating hot melt ink in said jet(s) so as to maintain said ink in a liquid state, said jet(s) comprising a material having a thermal conductivity of at least 0.03 g cal/sec cm 2 ( * C/cm).
  • the ink jet material has a thermal conductivity of at least 0.2 g cal/sec cm 2 (°C/cm).
  • Any of a plurality of highly thermally conductive materials may be utilized including stainless steel, although aluminum is preferred.
  • the apparatus comprises a reservoir which is also coupled to the heater means.
  • the reservoir also comprises a material having a thermal conductivity of at least 0.03 g cal/sec cm 2 (°C/cm) and preferably more than 0.2 g cal/sec cm 2 ( * C/cm).
  • FIG. 1 is a sectional view of one form of ink jet system in accordance with this invention.
  • an ink jet apparatus comprises an imaging head 10 including at least one ink jet 12 and a reservoir 14.
  • the ink jet apparatus is adapted to jet droplets of hot melt or phase change ink.
  • Substantially all of the imaging head 10 and the reservoir 14 in contact with the melted ink comprises a highly thermally conductive material so as to minimize temperature gradients and thereby avoid degradation of the ink and assure high performance and reliability of the ink jet apparatus.
  • a block of solid state ink 16 is juxtaposed to an opening in a trough 18.
  • the pellet 16 drops into the trough 18, the pellet 16 proceeds to melt in response to heat generated by a heater 20 located at the base of the reservoir 14 below a sloping surface 22.
  • the ink jet 12 includes a chamber 24 having an orifice 26 for ejecting droplets of ink and an inlet 28 extending to the lowermost extremity 30 of the reservoir 14 adjacent the sloping bottom 22.
  • the head 10 is provided with an independent heater 32 located between a thermal resistance barrier 34 comprising insulation and a head member 36.
  • a thermal resistance barrier 34 comprising insulation and a head member 36.
  • inlet 28 passes through the head member 36 which is highly conductive such that heat is conducted to the end 38 which maintains a pool of ink 40 in the liquid state in the immediate vicinity of the end 38 while the remainder of the ink within the reservoir-14 is able to cool to the solid state when the system is in a standby mode.
  • the pool 40 of liquid ink is maintained in an otherwise solid state mass 42 of ink extending up to a level 44.
  • a transducer 46 is juxtaposed to the end of the chamber 24.
  • the transducer which is provided with electrodes is energized by a signal provided through a printed circuit board 48 located above the member 36.
  • the transducer 46 and the printed circuit board 48 are then housed within head members 50 and 52.
  • the head includes a chamber plate 54 forming the chamber 24, which is in communication with a foot 56 located at the end of the transducer 46.
  • the inlet 28 supplies a manifold 58 located in a plate 60 which is coupled to restricted inlets to the jet 12.
  • the manifold 58 serves a plurality of restricted inlets in an array of ink jets identical to the jet 12 shown in Fig. 1.
  • the reservoir 14 as shown in Fig. 1 also includes a filter 62 which is located below a port 64 which is adapted to be opened and closed by a needle valve 66.
  • the needle valve 66 is employed to close the port 64 during the priming operation.
  • the insulating barrier 34 which provides a high thermal resistance path is sealed against portion 70 of the reservoir 14, using an 0-ring 72 which is also characterized by adequate insulating properties.
  • the member 36 which extends down into the reservoir 14 toward the lowermost portion 30 is slightly spaced from portion 70 of the reservoir 14. This spacing assures an adequate thermal barrier and high thermal resistance path so as to permit independent heating of the ink within the head as compared to the heat within the reservoir 14.
  • Fig. 1 shows redundant level sensing elements 74 and 76, which may comprise RF level sensing or other electrical sensor means.
  • Baffles 78 are also provided in the reservoir 14.
  • the head 10 as well as the reservoir 14 have a thermal conductivity in excess of 0.03 g cal/sec cm 2 ( o C/cm).
  • the thermal conductivity of the head 10 and the reservoir 14 is in excess of 0.2 g cal/sec cm 2 (°C/cm).
  • the advantages associated with high thermal conductivity so as to minimize temperature gradients and hot spots is achieved as well as rapid heating to t.he desired operating temperature.
  • aluminum by virtue of its relatively low density provides a relatively lightweight imaging head 10 and reservoir 14 so as to minimize the inertia of the head 10 and the reservoir 14, 'thereby permitting rapid movement of the jet with respect to a surface being scanned.
  • aluminum will not chemically react with the ink.
  • thermal resistance barrier 34 may comprise a material having a thermal conductivity less than 0.005 g cal/sec cm 3 ( o C/cm). The thermal barrier may also be achieved without benefit of insulation by minimizing the metal contact between the head 10 and the reservoir 14. However, substantially all of the head 10 and the reservoir 14 which is in direct or indirect contact with the ink does comprise the high thermal conductivity material, a notable exception including the filter 62. Indirect contact is achieved where the material such as copper is coated so as to minimize any reaction with the ink. It is also possible to utilize more than one high thermal conductivity material in the ink jet apparatus. For example, it may be possible to make a portion of the head 10 from aluminum with a portion or all of the reservoir 14 comprises stainless steel.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP19850307373 1984-10-15 1985-10-14 Farbstrahlgerät Expired EP0179607B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US661029 1984-10-15
US06/661,029 US4607266A (en) 1984-10-15 1984-10-15 Phase change ink jet with independent heating of jet and reservoir
US66192484A 1984-10-16 1984-10-16
US661924 1984-10-16

Publications (3)

Publication Number Publication Date
EP0179607A2 true EP0179607A2 (de) 1986-04-30
EP0179607A3 EP0179607A3 (en) 1988-04-06
EP0179607B1 EP0179607B1 (de) 1991-09-18

Family

ID=27098226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850307373 Expired EP0179607B1 (de) 1984-10-15 1985-10-14 Farbstrahlgerät

Country Status (3)

Country Link
EP (1) EP0179607B1 (de)
DE (1) DE3584136D1 (de)
HK (1) HK21092A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683051A3 (de) * 1988-04-22 1996-01-17 Seiko Epson Corp Nach der Art eines Tintenstrahlschreibers arbeitendes Gerät und Verfahren.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247519A (en) * 1962-08-20 1966-04-19 Neff Instr Corp Graphical recording system employing heated ink compositions
US4106030A (en) * 1977-02-14 1978-08-08 Recognition Equipment Incorporated Ink jet printer ink heater
JPS597052A (ja) * 1982-06-30 1984-01-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション 液体噴射記録装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683051A3 (de) * 1988-04-22 1996-01-17 Seiko Epson Corp Nach der Art eines Tintenstrahlschreibers arbeitendes Gerät und Verfahren.

Also Published As

Publication number Publication date
EP0179607B1 (de) 1991-09-18
EP0179607A3 (en) 1988-04-06
DE3584136D1 (de) 1991-10-24
HK21092A (en) 1992-03-27

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