EP1073967A2 - Method of operating computerized printer heads - Google Patents

Method of operating computerized printer heads

Info

Publication number
EP1073967A2
EP1073967A2 EP99914741A EP99914741A EP1073967A2 EP 1073967 A2 EP1073967 A2 EP 1073967A2 EP 99914741 A EP99914741 A EP 99914741A EP 99914741 A EP99914741 A EP 99914741A EP 1073967 A2 EP1073967 A2 EP 1073967A2
Authority
EP
European Patent Office
Prior art keywords
heads
printing
matrix
programmed
computerized printer
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
EP99914741A
Other languages
German (de)
French (fr)
Other versions
EP1073967A4 (en
EP1073967B1 (en
Inventor
Yoram Duchovne
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.)
Scitex Vision Ltd
Original Assignee
Scitex Vision Ltd
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
Application filed by Scitex Vision Ltd filed Critical Scitex Vision Ltd
Publication of EP1073967A2 publication Critical patent/EP1073967A2/en
Publication of EP1073967A4 publication Critical patent/EP1073967A4/en
Application granted granted Critical
Publication of EP1073967B1 publication Critical patent/EP1073967B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/15—Arrangement thereof for serial printing
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/14—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction
    • B41J19/142—Character- or line-spacing mechanisms with means for effecting line or character spacing in either direction with a reciprocating print head printing in both directions across the paper width
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding

Definitions

  • the present invention relates to computerized printing, and particularly to the operation of ink-jets printing heads.
  • a printing head as denoted H in Fig. 1 a comprises a series of tiny ink- emitting nozzles N, and a computer programmed mechanism for controlling the timing of each and every one of the nozzles according to the pattern to be printed.
  • the printed pattern for example the letter a as shown in Fig. 1b, is printed by the head H while traveling over a substrate, usually a paper sheet P, by a series of dots each formed by one of the vertically arranged nozzles. The accumulation of the dots completes the requested pattern.
  • the head completes a line or row over the paper sheet, the latter is pulled upwards and the head commences its travel in the opposite direction (Fig. 1c) to print the requested patterns such as s at the beginning (end) of the next raw and the letter o at the end of this reverse travel.
  • a method of operating printing heads comprising the steps of providing a series of at-least two printing heads; mounting the heads on a common carriage in a side-by-side, at least partly sidewise overlapping relative position, and activating the heads for printing on a substrate in a programmed periodical sequence.
  • a computerized printer comprising a matrix of printing heads operable in unison.
  • Fig. 1a schematically shows the face side of a typical ink-jets printing head
  • Fig. 1 b illustrates the conventional printing process of a first row
  • Fig. lc illustrates the conventional printing process of a second, following row
  • Fig. 2a shows an assembly of four printing heads, mounted onto a common carriage
  • Fig. 2b illustrates the printing process according to a first mode of operation
  • Fig. 3 exemplifies the printing of certain symbols, assuming (for illustration
  • Fig. 4 illustrates the use of the first mode of operation for printing the symbols of
  • Fig. 5 illlustrates a second mode of operation
  • Fig. 6 illustrates a third mode of operation
  • Fig. 7 shows a second assembly arrangement of printing heads applicable to the
  • Fig. 8 shows a third assembly arrangement of printing heads applicable to the
  • FIG. 2a and 2b there is shown that more than one head —4 in the
  • Mode 1 namely in exact succession
  • Mode 1 printing speed is multiplied by four (or other number equal to the number of heads) without diluting the (longitudinal) density of dots.
  • the vertical density remains tne same.
  • Fig. 3 there are shown the letters ⁇ , b and.c. It is assumed, for the sake of explanation only, that the letters are composed of singular, discrete dots only — which of course is not the case in reality.
  • Mode 1 is such that the first column is produced by head A , the second by head B, the third by C_ and the fourth by D, and so forth in the same sequence.
  • the main advantage derived is, as above said, the multiplication of the carriage speed, and hence the reduction of overall printing duration.
  • the dots In printing processes, it sometimes occurs that the dots must be applied more than once on the same spot. This is required if the substrate is of an absorbent, fibrous or porous material such as cardboard or even cloth; or if certain parts of a text, or portions of colored prints are to be emphasized. Conventionally, in such cases, double or triple printing is applied, causing waste of time.
  • Mode 2 of the present invention method presents an effective solution, as exemplified in Fig. 5.
  • Fig. 6 illustrates yet another mode of operation - Mode 3.
  • This mode contributes to the art of printing in the following manner. It may occur, during the printing process, that one or more of the nozzles become clogged or otherwise cease to function properly. In conventional systems, the complete head has to be replaced, should the quality (density) of the print be retained.
  • pairs (or more) of the series of heads are linked in such a fashion that one can replace the other regarding any given point.
  • a dot can be applied by either one of the pair of associated heads, in a selective, i.e. programmed, manner.
  • Mode 3 therefore allows for real time surveillance of the printing process, e.g. by using suitable scanners; once a local quality deterioration is observed, say because one of head A nozzle stopped working, a command will be transmitted to head C to "take over” and apply the ink to the same spot, previously fed by head A; and the same with regard to the pair of B and D heads.
  • a matrix of 4x3 heads is assembled, driven by a common carriage (not shown).
  • the heads A to D are not alligned one with respect to the other, resulting in a rhombus or rhomboid patterned matrixes.
  • a part of head.A. is sidewise overlapped by head £; C overlaps A and ⁇ ; and D overlaps A, £ and C.
  • This arrangement attains most of the benefits of the Fig. 7 arrangement, but with a considerably smaller number of heads.
  • all heads of every group as heretofore described may be of the same color, of different colors, or of the multi-color type, at the designer's option.
  • the advantages of the method are most striking in printing colored patterns.
  • the four heads group is the most efficient, each head containing ink of one of the four basic colors (cyano, magenta, yellow and black) used in the colors separation technique.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Electronic Switches (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

A method of operating printing heads (H) (Fig. 8), particularly of the ink-jet type. The method includes the steps of providing a series of more than one printing heads (H), mounting of the heads (H) on a common carriage in a side-by-side, partly sidewise overlapping position. The method also includes activating the heads (H) for printing on a substrate in a programmed periodical sequence.

Description

METHOD OF OPERATING COMPUTERIZED PRINTER HEADS
BACKGROUND OF THE INVENTION
The present invention relates to computerized printing, and particularly to the operation of ink-jets printing heads.
Ink-jets printing heads are most extensively used, available in a variety of types and capacities. Generally, a printing head as denoted H in Fig. 1 a comprises a series of tiny ink- emitting nozzles N, and a computer programmed mechanism for controlling the timing of each and every one of the nozzles according to the pattern to be printed. The printed pattern, for example the letter a as shown in Fig. 1b, is printed by the head H while traveling over a substrate, usually a paper sheet P, by a series of dots each formed by one of the vertically arranged nozzles. The accumulation of the dots completes the requested pattern. Once the head completes a line or row over the paper sheet, the latter is pulled upwards and the head commences its travel in the opposite direction (Fig. 1c) to print the requested patterns such as s at the beginning (end) of the next raw and the letter o at the end of this reverse travel.
This bi-directional method of printing head displacements is of course destined to increase the speed of the printing process, which is the general trend in the design of printers by the relevant industry at large. However, due to mechanical limitations governed on the one hand by the reaction time of the printing head nozzles and on the other hand by travel speed of the printing head carriage, the printing speed has not been significantly increased despite all directed efforts.
It is therefore an object of the present invention to substantially increase the printing speed by ink-jets printing heads of computerized printers.
It is a further object of the present invention to improve the quality of the printing and to avoid vacant spaces generated due to clogged or otherwise incomplete injection of ink by malfunctioned heads. It is a still further object of the present invention to make use of groups of two or more printing heads, operating in unison and thus reducing and/or selectively distributing the working load of each individual printing head of such group.
It is a still further object of the invention to increase the printing speed by providing a matrix of printing heads capable of printing more than one row at a time.
It is a still further object of the invention to provide matrixes of the printing heads operating in parallel and/or in series and thus allowing the distribution of the printing job in a selectively programmed form.
SUMMARY OF THE INVENTION
According to one aspect of the invention there is provided a method of operating printing heads, particularly of the ink-jets type, comprising the steps of providing a series of at-least two printing heads; mounting the heads on a common carriage in a side-by-side, at least partly sidewise overlapping relative position, and activating the heads for printing on a substrate in a programmed periodical sequence.
According to another aspect of the invention there is provided a computerized printer comprising a matrix of printing heads operable in unison.
BRIEF DESCRIPTION OF THE DRAWINGS
These and additional features and advantages of the invention will become more clearly understood in the light of the ensuring description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings, wherein -
Fig. 1a schematically shows the face side of a typical ink-jets printing head;
Fig. 1 b illustrates the conventional printing process of a first row; Fig. lc illustrates the conventional printing process of a second, following row;
Fig. 2a shows an assembly of four printing heads, mounted onto a common carriage,
illustrating a first arrangement according to the principles of the present invention;
Fig. 2b illustrates the printing process according to a first mode of operation;
Fig. 3 exemplifies the printing of certain symbols, assuming (for illustration
purposes only) that the symbols are composed of a series of single dots only;
Fig. 4 illustrates the use of the first mode of operation for printing the symbols of
Fig. 3;
Fig. 5 illlustrates a second mode of operation;
Fig. 6 illustrates a third mode of operation;
Fig. 7 shows a second assembly arrangement of printing heads applicable to the
method of the present invention; and
Fig. 8 shows a third assembly arrangement of printing heads applicable to the
method of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to Figs. 2a and 2b, there is shown that more than one head —4 in the
present example, denoted A, B, C and D — have been combined and mounted onto the
same carriage (not shown).
In operation, as most schematically and exaggerated illustrated in Fig. 2b, the heads
are so programmed that ink-ejection cycles A-B-C-D-A and so forth are maintained,
namely in exact succession (hereinafter "Mode 1").
It will be readily understood that the Mode 1 printing speed is multiplied by four (or other number equal to the number of heads) without diluting the (longitudinal) density of dots. The vertical density remains tne same.
For illustrating the advantages and diversification capabilities, attainable by this mode of operation, reference shall be first made to Figs. 3 and 4.
In Fig. 3 there are shown the letters^, b and.c. It is assumed, for the sake of explanation only, that the letters are composed of singular, discrete dots only — which of course is not the case in reality.
As most clearly seen in Fig. 4, the utilization of Mode 1 is such that the first column is produced by head A , the second by head B, the third by C_ and the fourth by D, and so forth in the same sequence.
The main advantage derived is, as above said, the multiplication of the carriage speed, and hence the reduction of overall printing duration.
In printing processes, it sometimes occurs that the dots must be applied more than once on the same spot. This is required if the substrate is of an absorbent, fibrous or porous material such as cardboard or even cloth; or if certain parts of a text, or portions of colored prints are to be emphasized. Conventionally, in such cases, double or triple printing is applied, causing waste of time.
Mode 2 of the present invention method presents an effective solution, as exemplified in Fig. 5.
Hence, since every portion of the printed area is passed-over by more than one head, it is most convenient to program the system so that two (or more) heads will eject the ink on one and the same spot.
Using the letters example of the previous example, it is shown that a pair of heads, say A+C and B+D are associated and used for the application of "double-printing", as explained.
Fig. 6 illustrates yet another mode of operation - Mode 3.
This mode contributes to the art of printing in the following manner. It may occur, during the printing process, that one or more of the nozzles become clogged or otherwise cease to function properly. In conventional systems, the complete head has to be replaced, should the quality (density) of the print be retained.
In the usage mode exemplified in Fig. 6, pairs (or more) of the series of heads are linked in such a fashion that one can replace the other regarding any given point. Thus, per every column, a dot can be applied by either one of the pair of associated heads, in a selective, i.e. programmed, manner.
Mode 3 therefore allows for real time surveillance of the printing process, e.g. by using suitable scanners; once a local quality deterioration is observed, say because one of head A nozzle stopped working, a command will be transmitted to head C to "take over" and apply the ink to the same spot, previously fed by head A; and the same with regard to the pair of B and D heads.
The "multi-head* concept herein proposed is readily extendable in another direction schematically presented in Fig.7.
Here, a matrix of 4x3 heads is assembled, driven by a common carriage (not shown).
All the attributes discussed above are applicable, in addition to, that_3 rows at a time are produced. The advancement speed of the paper sheet Js tripled, besides the time gain of the printing process proper.
In the embodiment illustrated in Fig. 8, the heads A to D are not alligned one with respect to the other, resulting in a rhombus or rhomboid patterned matrixes. Thus, a part of head.A. is sidewise overlapped by head £; C overlaps A and §; and D overlaps A, £ and C. This arrangement attains most of the benefits of the Fig. 7 arrangement, but with a considerably smaller number of heads.
It should be emphasized that all heads of every group as heretofore described may be of the same color, of different colors, or of the multi-color type, at the designer's option. The advantages of the method are most striking in printing colored patterns. Hence, the four heads group is the most efficient, each head containing ink of one of the four basic colors (cyano, magenta, yellow and black) used in the colors separation technique.
While the above description contains many specificities, these should not be construed as limitations on the scope of the invention, but rather as exemplification of the preferred embodiments. Those skilled in the art will envision other possible variations that are within its scope. Accordingly, the scope of the invention should be determined not by the embodiment illustrated, but by the appended claims and their legal equivalents.

Claims

WHAT IS CLAIMED IS:
1. A method of operating printing heads, particularly of the ink-jets type, comprising the steps of -
(i) providing a series of aWeast two printing heads;
(ii) mounting the heads on a common carriage in a side-by-side, at least partly sidewise overlapping relative position; and
(iii) activating the heads for printing on a substrate in a programmed periodical sequence.
2. The method as claimed in Claim 1 wherein the sequence is programmed so that the heads are activated in succession relative to each other.
3. The method as claimed in Claim 1 wherein the sequence is programmed so that the heads are activated one with a time lag relative to the other.
4. The method as claimed in any of Claims 2-3 wherein the heads are partly activated with regard to their linear capacity.
5. The method as claimed in Claim 1 wherein the heads are arranged in more than one row, forming a matrix.
6. The method as claimed in Claim 5 wherein the matrix is square.
7. The method as claimed in Claim 5 wherein the matrix is rectangular.
8. The method as claimed in Claim 5 wherein the matrix is a rhombus.
9. The method as claimed in Claim 5 wherein the matrix is a rhomboid.
10. A computerized printer comprising a matrix of printing heads operable in unison.
11. The computerized printer as claimed in Claim 10 wherein the operation of the heads is programmed so that the heads are activated in succession relative to each other.
12. The computerized printer as claimed in Claim 10 wherein the operation of the heads is programmed so that the heads are activated one with a time lag relative to the other.
13. The computerized printer as claimed in Claim 10 wherein the heads are partly activated with regard to their linear capacity.
14. The computerized printer as claimed in Claims 10 - 13 wherein the heads are arranged in more than one row, forming a matrix.
15. The computerized printer as claimed in Claim 14 wherein the matrix is square.
16. The computerized printer as claimed in Claim 14 wherein th matrix is rectangular.
17. The computerized printer as claimed in Claim 14 wherein the matrix is a rhombus.
18. The computerized printer as claimed in Claim 14 wherein the matrix is a rhomboid.
EP99914741A 1998-04-23 1999-04-20 Method of operating computerized printer heads Expired - Lifetime EP1073967B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL12418298 1998-04-23
IL12418298A IL124182A (en) 1998-04-23 1998-04-23 Method of operating computerized printer heads
PCT/IL1999/000209 WO1999054139A2 (en) 1998-04-23 1999-04-20 Method of operating computerized printer heads

Publications (3)

Publication Number Publication Date
EP1073967A2 true EP1073967A2 (en) 2001-02-07
EP1073967A4 EP1073967A4 (en) 2001-07-11
EP1073967B1 EP1073967B1 (en) 2008-10-08

Family

ID=11071428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99914741A Expired - Lifetime EP1073967B1 (en) 1998-04-23 1999-04-20 Method of operating computerized printer heads

Country Status (7)

Country Link
EP (1) EP1073967B1 (en)
JP (1) JP2002512138A (en)
AT (1) ATE410737T1 (en)
AU (1) AU3343699A (en)
DE (1) DE69939695D1 (en)
IL (1) IL124182A (en)
WO (1) WO1999054139A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004280A2 (en) * 2001-07-05 2003-01-16 Creo Srl Improved uniformity ink jet system
JP7439476B2 (en) * 2018-11-30 2024-02-28 株式会社リコー Liquid discharge device, discharge adjustment method, and discharge adjustment program

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4528576A (en) * 1982-04-15 1985-07-09 Canon Kabushiki Kaisha Recording apparatus
US4593295A (en) * 1982-06-08 1986-06-03 Canon Kabushiki Kaisha Ink jet image recording device with pitch-shifted recording elements
US4686538A (en) * 1984-10-31 1987-08-11 Canon Kabushiki Kaisha Tone recording method
EP0783973A2 (en) * 1995-12-28 1997-07-16 Canon Kabushiki Kaisha Method and apparatus for printing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547786A (en) * 1984-08-02 1985-10-15 Metromedia, Inc. Ink jet printing system
US4940998A (en) * 1989-04-04 1990-07-10 Hewlett-Packard Company Carriage for ink jet printer
JP3391924B2 (en) * 1995-01-31 2003-03-31 キヤノン株式会社 Image recording device
JPH09277511A (en) * 1996-04-18 1997-10-28 Fuji Xerox Co Ltd Ink-jet printing apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4528576A (en) * 1982-04-15 1985-07-09 Canon Kabushiki Kaisha Recording apparatus
US4593295A (en) * 1982-06-08 1986-06-03 Canon Kabushiki Kaisha Ink jet image recording device with pitch-shifted recording elements
US4686538A (en) * 1984-10-31 1987-08-11 Canon Kabushiki Kaisha Tone recording method
EP0783973A2 (en) * 1995-12-28 1997-07-16 Canon Kabushiki Kaisha Method and apparatus for printing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9954139A2 *

Also Published As

Publication number Publication date
AU3343699A (en) 1999-11-08
WO1999054139A2 (en) 1999-10-28
WO1999054139A3 (en) 1999-12-09
JP2002512138A (en) 2002-04-23
EP1073967A4 (en) 2001-07-11
IL124182A (en) 2001-12-23
DE69939695D1 (en) 2008-11-20
ATE410737T1 (en) 2008-10-15
EP1073967B1 (en) 2008-10-08

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