EP0532270A2 - Tintenstrahlaufzeichnungsgerät - Google Patents

Tintenstrahlaufzeichnungsgerät Download PDF

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Publication number
EP0532270A2
EP0532270A2 EP92308129A EP92308129A EP0532270A2 EP 0532270 A2 EP0532270 A2 EP 0532270A2 EP 92308129 A EP92308129 A EP 92308129A EP 92308129 A EP92308129 A EP 92308129A EP 0532270 A2 EP0532270 A2 EP 0532270A2
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EP
European Patent Office
Prior art keywords
recording
ink
discharging
recording medium
conveying
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.)
Withdrawn
Application number
EP92308129A
Other languages
English (en)
French (fr)
Other versions
EP0532270A3 (en
Inventor
Kenjiro C/O Canon Kabushiki Kaisha Watanabe
Haruyuki C/O Canon Kabushiki Kaisha Matsumoto
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Publication of EP0532270A2 publication Critical patent/EP0532270A2/de
Publication of EP0532270A3 publication Critical patent/EP0532270A3/en
Withdrawn legal-status Critical Current

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    • 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
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes

Definitions

  • the present invention relates to an ink jet recording apparatus. More particularly, the invention relates to an ink jet recording apparatus capable of suppressing the degradation of recording quality attributable to recording means.
  • the ejecting velocity of the ink droplets is slowed down to distort characters or missing dots may take place due to disabled ejections.
  • the present inventor et al have analyzed the foregoing phenomena of the unfavorable foaming and arrived at the conclusion given below.
  • the heating surfaces of the nozzles used for recording receive a kind of cleaning action by the forces exerted at the time of the ink bubbles fading away.
  • the heating surfaces in the nozzles which are not used are eventually covered by a thin film of impurities created as the time elapses with the increasedly viscous ink and other minute dusty particles adhering to the discharging surfaces which are gradually pressed into the nozzles each time the discharging surfaces are wiped by a cleaning blade. Consequently, the heat generated by the heaters are not transferred to ink sufficiently; hence making the foaming amounts of the ink smaller than those originally estimated.
  • the present invention is designed in accordance with the aforesaid results of the findings conducted by the present inventor et al. It is an object of the invention to provide an ink jet recording apparatus capable of avoiding the foregoing unfavorable foaming phenomena for the stable recording.
  • an ink jet recording apparatus which comprises: a conveying mechanism for conveying a recording medium; a carriage for carrying an ink jet recording head, having a plurality of discharging ports arranged substantially in parallel with the conveying direction of the aforesaid recording medium, in the direction intersecting the conveying direction of the foregoing recording medium; and a control mechanism arranged with plural discharging ports for a-plurality of discharging groups to select the conveying amount for a recording medium in accordance with the discharging groups to be used for recording, there being mixed in the aforesaid control mechanism the line on which the recording is performed using the discharging port located furthest on the downstream side in the conveying direction of the aforesaid recording medium with respect to the recording signal of the recording signals in one scanning, which is located furthest on the downstream side of the aforesaid recording medium, and the line on which the recording is performed using the discharging port located furthest on the upstream side in
  • Fig. 1 is a view for explaining the conveying amounts of the nozzles and a recording medium used when character printings are performed by a recording apparatus according to an embodiment of the present invention.
  • Fig. 2 is a perspective view showing the entire structure of an ink jet recording apparatus.
  • Fig. 3 is a block diagram showing a control system.
  • Fig. 4 is a flowchart showing recording procedures.
  • Fig. 5A is a table showing the nozzles used and the total discharge number in a case of recording using a conventional recording apparatus.
  • Fig. 5B is a table showing the nozzles used and the total discharge number in a case of recording using a recording apparatus according to an embodiment of the present invention.
  • Fig. 6 is a view for explaining the conveying amounts of the nozzles and a recording medium used when character printings are performed by a second embodiment according to the present invention.
  • Fig. 1 is a view for explaining the nozzles used when character printings are performed.
  • Fig. 2 is a perspective view showing the entire structure of an ink jet recording apparatus.
  • Fig. 3 is a block diagram showing a control system, and
  • Fig. 4 is a flowchart showing recording is procedures.
  • a recording head 1 serving as recording means is mounted on a carriage 2.
  • This carriage 2 is supported slidably along guide rails 3 and 4 and is simultaneously connected to a timing belt 7 tensioned between pulleys 5 and 6. In this way, the carriage 2 is allowed to scan along the guide rails 3 and 4 when a carriage motor 8 coupled to the pulley 5 is driven normally or reversely.
  • the recording head 1 is driven in synchronism with the foregoing carriage 2 to perform recording.
  • This recording head 1 is provided with the nozzles which serve as fine liquid discharging ports, liquid passages and energy activating portions arranged partially in the liquid passages, and energy generating means for generating the energy which enables the liquid in the aforesaid portions to be activated to form ink droplets.
  • the recording head in the present embodiment has, as described above, 64th nozzles arranged in a line at intervals of 1/360 inches in upper and lower rows.
  • energy generating means for generating the energy which enables ink to be ejected from the nozzles there are a recording method using electromechanical transducers such as piezoelectric elements and others, a recording method using energy generating means wherein heat is generated by irradiation of electromagnetic waves such as laser and liquid droplets are ejected by the effect of heat thus generated, or a recording means using energy generating means wherein liquid is ejected by heating the liquid by electro-thermal transducers such as heat generating elements having exothermic resistive members.
  • the recording heads used for the ink jet recording method wherein the liquid is ejected by the heat energy are especially effective in performing high resolution recording because the nozzles for discharging recording liquid to form the ejection droplets can be arranged in a high density.
  • the recording head which uses electrothermal transducers as energy generating means has advantages that it can be built compactly and at the same time, a high density assembly is possible at a low manufacturing cost because this type of head can utilize sufficiently the excellent aspects of the IC technologies and micromachining techniques which have made remarkable advances in recent years in the field of semiconductor engineering to enhance their reliability significantly.
  • capping means 9 is arranged at the home position of the foregoing carriage 2 (which is outside the recording area. In Fig. 2, it is at the left end position of the guide rails 3 and 4.
  • This capping means 9 is to suck unwanted ink from the nozzles of the recording head 1 or to cap the ink discharging ports in order to prevent the vicinity of the ink discharging ports from being dried when the nozzles are not in use.
  • This capping means 9 is structured movable in the direction indicated by an arrow in Fig. 2. When a capping is conducted, the carriage 2 is moved to its home position and then the capping means 9 is advanced forward to cover the ink discharging ports of the recording head 1 airtightly.
  • a reference numeral 9a designates a wiper blade.
  • Conveying means for conveying a recording medium 10 (ordinary sheet, plastic sheet, or the like) comprises a feed roller (not shown) which is connected to a conveying motor 11 and a pinch roller which is in contact with the aforesaid roller under pressure to rotate following the rotation thereof.
  • the recording medium 10 guided by a paper pan 12 is conveyed in U-turn by means of the feed roller and pinch roller driven by the conveying motor 11.
  • the recording medium 10 which has been conveyed in U-turn is exhausted by means of an exhaust roller 13 and a spur 14.
  • a reference numeral 15 designates a control unit comprising a CPU 15a, ROM 15b, and RAM 15c.
  • the CPU 15a is a central arithmetic processing unit to read programs and various data from the ROM 15b which will be described later and an input equipment and other external equipment and also execute required calculations as well as determinations to perform various controls.
  • the ROM 15b is a read only memory to store for the operations of the CPU 15a various programs represented by a flowchart shown in Fig. 4, for example, and various data required for recording character codes, dot patterns, and the like.
  • the RAM 15c is a random access memory comprising a working area where the foregoing CPU 15a temporarily stores the instructed data and the results of calculation, a buffer area where various data inputted from the external equipment or the like, a text area where documents and the like are stored, and some others.
  • the foregoing control unit 15 outputs driving signals to a head driving circuit 16 for driving the recording head 1 and motor driving circuits 17 and 18 for driving the carriage motor 8 and conveying motor 11, and provides driving controls as described later for the conveyance of the recording medium 10 and the nozzles of the recording head 1 to be used.
  • the nozzles used for recording are set so that they are always the same. More specifically, the third to 39th nozzle groups (37 nozzles) are used of the nozzles of the first to 64th and no other nozzles are used.
  • the present embodiment performs recordings in such a manner that in step S1, the recording data for one-line portion are transferred and in step S2, the carriage 2 is caused to scan and at the same time, the recording head 1 is driven to record the first one-line portion.
  • the third to 39th nozzle groups of the 64th nozzles arranged in a line are used to conduct the recording (this is called "upper side use" (the groups on the downstream side in the conveying direction of the recording medium 10 are used)).
  • step S3 whether the second line recording is required or not is discriminated. If the next line recording is required, the recording medium 10 is conveyed in step S4 for 44/360 inches. Then, in step S5, the recording data for the next line are transferred and in step S6, the carriage 2 is caused to scan and at the same time, the recording head 1 is driven to record the second line portion. At this juncture, the 19th to 55th nozzle groups are used for recording (this is called "lower side use" (the groups on the upstream side in the conveying direction of the recording medium 10 are used)).
  • step S7 whether the recording for the third line portion is required or not is discriminated. If the next line recording is required, the recording medium 10 will be conveyed for 76/360 inches in step S8. Then, in step S9, the recording data for the next line are transferred. Thus, the process will return to the step S2 to record the third line portion applying the upper side use in the same fashion as described above.
  • the conveying amounts of the recording medium 10 are set in two different kinds, and the conveying amount of the recording medium 10 is switched over for each of the recording lines. Further, by adopting the upper side use and lower side use for the nozzle groups of the recording head 1 to be operated for ejecting ink in response to the foregoing switch over, the printing pitch for each line becomes 1/6 inches for any one of the lines. Thus, it becomes possible to even off the distribution of the accumulated discharge number for each of the 64 nozzles. As a result, the number of the nozzles which are used only seldom can be reduced significantly.
  • Figs. 5A and 5B there are illustrated the results of comparison with the accumulated discharge number per nozzle when a certain sentence composed of English letters (upper and lower case letters) and numerals having line pitches of 1/6 inches is printed by a conventional recording method in accordance with the same recording procedures as above.
  • the recording medium is conveyed 1/6 inches per line, and the second to 48th nozzle groups are always used for recording lower-case letters (a b c d e f g).
  • the first to 39th nozzle groups are always used for recording numerals (0 1 2 3 4 5 6 7 8 9). Therefore, as shown in Fig. 5A, the nozzles to be used are locally concentrated whereas the 49th to 64th nozzle groups are not used at all.
  • the using nozzles are spreaded over entirely as shown in Fig. 5B even when the same example of the sentence is recorded.
  • the distribution of the accumulated discharge number is also even off (the discharge number of a nozzle which is used most often is reduced to approximately 2/3 of the result of the recording using the conventional method).
  • the nozzles which have not been used at all are no longer observed.
  • the nozzles to be used are even off.
  • the nozzles which are rarely used do not exist any longer, either.
  • the density unevenness and missing dots can thus be prevented to restrain the recording quality from being degraded even when the apparatus is in use for a long period of time.
  • the third to 39th nozzle groups are used when a letter "A" is recorded by the upper side use, for example, while the 19th and 55th nozzle groups are employed in a case of the lower side use.
  • the description will be made of an example in which the first nozzle is made fiducal for the upper side use while the 64th nozzle is made fiducial for the lower side use.
  • a recording medium 10 is conveyed for 33/360 inches.
  • the recording medium is conveyed for 87/360 inches.
  • Fig. 6 shows the recording state where recordings are controlled so that the upper side use and lower side use are alternately present as a mixture.
  • the recording data within a recording line are checked, and the first nozzle positioned at the uppermost end of the recording head 1 (the downstream end in the conveying direction of the recording medium 10) is used for recording the dot positioned at the uppermost end (the downstream end in the conveying direction of the recording medium 10) among those dots thus checked.
  • the recording data within a recording line are checked, and the 64th nozzle positioned at the lowermost end of the recording head 1 (the upstream end in the conveying direction of the recording medium 10) is used for recording the dot positioned at the lowermost end (the upstream end in the conveying direction of the recording medium 10) among those dots thus checked.
  • the distribution of the accumulated discharge number per nozzle of the recording head 1 is made more even than the case of the foregoing first embodiment.
  • the first and second nozzles are not used often in a case of the upper side use and the 56th to 64th nozzles are not used often, either, in a case of the lower side use due to the way letters are designed (this does not necessarily mean that they are not used at all as in the case of the conventional printing method), such nozzles are also used evenly if recordings are controlled as in the second embodiment. Accordingly, the degradation of the recording quality can be restrained even when the apparatus is used in a longer period of time.
  • the first nozzle is used to record the dot positioned at the uppermost end of the recording data for the upper side use and the 28th nozzle is used to record the dot positioned at the uppermost end of the recording data for the lower side use.
  • the intervals between each of the nozzles are 1/360 inches.
  • the size of the letters and line pitches are not necessarily limited to them as a matter of course.
  • the actual conveying amount of the recording medium is set at L p - L n when the upper side use is shifted to the lower side use and such an actual amount should only be set at L p + L n when the lower side use is shifted to the upper side use on the contrary.
  • the examples are shown, in which the upper side use and lower side use are alternately present as a mixture in recording, but this is not necessarily made alternately. It may be possible to make arrangement so that they are present as a mixture every two lines or three lines or even at random.
  • the conveying amount of the recording medium 10 is set in two different kinds and the descriptions have been made of the cases of the upper side use and lower side use.
  • the 11th to 47th nozzle groups of the recording head 1 are used for recording the letter "A", for example and it may be possible to enable three kinds, the upper side use, central use, and lower side use, to be present as a mixture or further, more than three kinds to be present as a mixture.
  • an ink jet recording method is used as recording means. It is preferable to arrange the structure so that in response to recording signals electrothermal transducers are energized to eject ink from the discharging ports for recording by the effect of growing bubbles exothermically created by the foregoing electrothermal transducers which generate film boiling.
  • the principle is such that at least one driving signal, which provides a rapid temperature rise beyond a departure from nucleation boiling point in response to recording information, is applied to an electrothermal transducer disposed on a liquid (ink) retaining sheet or liquid passage whereby to cause the electrothermal transducer to generate thermal energy to produce film boiling on the thermoactive portion of the recording head for the effective formation of a bubble in the recording liquid corresponding to each of the driving signals.
  • the liquid is ejected through a discharging port to produce at least one droplet.
  • the driving signal is preferably in the form of a pulse because the development and contraction of the bubble can be effected instantaneously, and therefore, the liquid is ejected with quick response.
  • the driving signal in the form of the pulse is preferably such as disclosed in U.S. Patent Nos. 4,463,359 and 4,345,262.
  • thermoactive surface is preferably such as disclosed in U.S. Patent No. 4,313,124.
  • the structure of the recording head may be as shown in U.S. Patent Nos. 4,558,333 and 4,459,600 wherein the thermoactive portion is disposed at a bent portion, as well as the structure of the combination of the discharging port, liquid passage, and the electrothermal transducer as disclosed in the abovementioned patents (linear type liquid passage or right angle liquid passage).
  • the present invention is applicable to the disclosed in Japanese Laid-Open Patent Application No. 59-123670 (123670/1984) wherein a common slit is used as the discharging port for plural electrothermal transducers, and to the structure disclosed in Japanese Laid-Open Patent Application No. 59-138461 (138461/1984) wherein an opening for absorbing pressure wave of the thermal energy is formed corresponding to the ejecting portion.
  • a common slit is used as the discharging port for plural electrothermal transducers
  • Japanese Laid-Open Patent Application No. 59-138461 138461/1984
  • the present invention is applicable to a serial type recording head wherein the recording head is fixed on the main assembly, to a replaceable chip type recording head which is connected electrically with the main apparatus and can be supplied with the ink when it is mounted in the main assembly, or to a cartridge type recording head having an integral ink container.
  • the recording heads mountable on the carriage may be a single head corresponding to a single color ink, or may be plural heads corresponding to a plurality of ink materials having different recording color or density.
  • the present invention is effectively applicable to an apparatus having at least one of a monochromatic mode mainly with black, a multicolor mode with different color ink materials and/or a fullcolor mode using the mixture of the colors, which may be an integrally formed recording unit or a combination of plural recording heads.
  • the ink has been liquid.
  • it may be an ink material which is solidified below the room temperature but liquefied at the room temperature. Since the ink is controlled within the temperature not lower than 30°C and not higher than 70°C to stabilize the viscosity of the ink to provide the stabilized ejection in usual recording apparatus of this type, the ink may be such that it is liquid when the recording signal to be used is applied.
  • the present invention is applicable to an ink material having the property that the ink is liquefied only when thermal energy is applied, such as an ink to be liquefied by the thermal energy applied in accordance with recording signals in any way or an ink to start being solidified immediately when it arrives at a recording sheet.
  • the ink material adopted in such a case as this may be retained as a liquid or solid material in through holes or recesses formed in a porous sheet as disclosed in Japanese Laid-Open Patent Application No. 54-56847 and Japanese Laid-Open Patent Application No. 60-71260 and may be faced to the electrothermal transducers.
  • the film boiling system is the most effective one for the ink materials described above.
  • the ink jet recording apparatus may be used as an output terminal of an information processing apparatus such as a computer, as a copying apparatus combined with an image reader or the like, or as a facsimile apparatus having information transmitting and receiving functions.
  • an information processing apparatus such as a computer
  • a copying apparatus combined with an image reader or the like or as a facsimile apparatus having information transmitting and receiving functions.
  • the present invention is capable of controlling recording operations so that the discharging ports to be used are not locally biased. Consequently, the accumulated discharge number of the ink discharging ports is even off to a certain extent; hence making it difficult to generate any unfavorable foaming due to the accumulation of dye stuff and impurities in the ink material on the exothermic elements. This leads to a significant reduction of record omission and recording distortion. It is thus possible to restrain the recording quality from being degraded in a long term use as well as to prolong the life of recording means.

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  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Handling Of Sheets (AREA)
EP19920308129 1991-09-09 1992-09-08 Ink jet recording apparatus Withdrawn EP0532270A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP255953/91 1991-09-09
JP25595391A JPH0564891A (ja) 1991-09-09 1991-09-09 インクジエツト記録装置及びインクジエツト記録方法

Publications (2)

Publication Number Publication Date
EP0532270A2 true EP0532270A2 (de) 1993-03-17
EP0532270A3 EP0532270A3 (en) 1993-06-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920308129 Withdrawn EP0532270A3 (en) 1991-09-09 1992-09-08 Ink jet recording apparatus

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EP (1) EP0532270A3 (de)
JP (1) JPH0564891A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0679518A1 (de) * 1994-03-02 1995-11-02 Seiko Epson Corporation Druckkopf, speziell für den Gebrauch eines seriellen Druckers
EP0686507A3 (de) * 1994-05-31 1996-04-17 Canon Kk Verfahren und Anlage zum Farbendruck
US6158835A (en) * 1999-01-08 2000-12-12 Hewlett-Packard Company Nozzle usage balancing for ink-jet printers
EP1085458A1 (de) * 1999-09-20 2001-03-21 Hewlett-Packard Company Hybrides Maskenmuster für Mehrfachströpfentintenstrahldrucker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6106102A (en) * 1992-05-01 2000-08-22 Hewlett-Packard Company Odd number of passes, odd number of advances, and separated-diagonal-line masking, in liquid-ink printers
JP4510225B2 (ja) * 1999-05-14 2010-07-21 キヤノン株式会社 記録装置および記録方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033444A (en) * 1976-01-20 1977-07-05 Burroughs Corporation System for extending the life of a pin printer using pin shifting
JPS60129266A (ja) * 1983-12-15 1985-07-10 Sharp Corp ドツトプリンタにおけるライン印字方式
DE3806225A1 (de) * 1988-02-26 1989-08-31 Siemens Ag Anordnung zur erhoehung der ueberlebenswahrscheinlichkeit von matrixdruckkoepfen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033444A (en) * 1976-01-20 1977-07-05 Burroughs Corporation System for extending the life of a pin printer using pin shifting
JPS60129266A (ja) * 1983-12-15 1985-07-10 Sharp Corp ドツトプリンタにおけるライン印字方式
DE3806225A1 (de) * 1988-02-26 1989-08-31 Siemens Ag Anordnung zur erhoehung der ueberlebenswahrscheinlichkeit von matrixdruckkoepfen

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 290 (M-430)(2013) 16 November 1985 & JP-A-60 129 266 ( SHARP K.K. ) 10 July 1985 *
RESEARCH DISCLOSURE no. 291, July 1988, NEW YORK, NY, USA page 473 , XP000105654 ANONYMOUS 'Method for Printing in 8-bit Graphic Mode Utilizing a 24-wire Print Head' *
XEROX DISCLOSURE JOURNAL vol. 16, no. 4, July 1991, STAMFORD, CONN., US pages 227 - 228 , XP000225923 DONAHUE 'EXTENDING THE LIFE OF A THERMAL INKJET PRINTHEAD BY HEATER-NOZZLE SHIFTING' *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0679518A1 (de) * 1994-03-02 1995-11-02 Seiko Epson Corporation Druckkopf, speziell für den Gebrauch eines seriellen Druckers
US5686944A (en) * 1994-03-02 1997-11-11 Seiko Epson Corporation Serial printer with hybrid print control of interlaced and minute feed printing
EP0686507A3 (de) * 1994-05-31 1996-04-17 Canon Kk Verfahren und Anlage zum Farbendruck
US6022096A (en) * 1994-05-31 2000-02-08 Canon Kabushiki Kaisha Color recording apparatus and method
US6158835A (en) * 1999-01-08 2000-12-12 Hewlett-Packard Company Nozzle usage balancing for ink-jet printers
EP1085458A1 (de) * 1999-09-20 2001-03-21 Hewlett-Packard Company Hybrides Maskenmuster für Mehrfachströpfentintenstrahldrucker
EP1310905A1 (de) * 1999-09-20 2003-05-14 Hewlett-Packard Company Hybrides Maskenmuster für Mehrfachtropfen-Tintenstrahldrucker

Also Published As

Publication number Publication date
EP0532270A3 (en) 1993-06-23
JPH0564891A (ja) 1993-03-19

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