EP0931668A2 - Procédé d'enregistrement pour une imprimante à jet d'encre - Google Patents

Procédé d'enregistrement pour une imprimante à jet d'encre Download PDF

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Publication number
EP0931668A2
EP0931668A2 EP99101491A EP99101491A EP0931668A2 EP 0931668 A2 EP0931668 A2 EP 0931668A2 EP 99101491 A EP99101491 A EP 99101491A EP 99101491 A EP99101491 A EP 99101491A EP 0931668 A2 EP0931668 A2 EP 0931668A2
Authority
EP
European Patent Office
Prior art keywords
nozzles
recording sheet
ink
recorded
feeding
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Withdrawn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
EP99101491A
Other languages
German (de)
English (en)
Other versions
EP0931668A3 (fr
Inventor
Shuichi Aratsu
Kunio c/o Fuji Photo Film Co. Ltd. Hakkaku
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0931668A2 publication Critical patent/EP0931668A2/fr
Publication of EP0931668A3 publication Critical patent/EP0931668A3/fr
Withdrawn legal-status Critical Current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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B41J11/425—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering for a variable printing material feed amount

Definitions

  • the present invention relates to a recording method in an ink jet printer in which ink is ejected onto a recording sheet or another recording medium from nozzles to perform recording, and an ink jet printer using the method.
  • an ink jet printer is used as an output device of a computer, a word processor, or the like because of its quiet recording or for another reason.
  • a carriage shaft is disposed in parallel with a flat platen, and a receprocatable carriage is disposed along the carriage shaft.
  • an ink jet recording head mounted on the carriage has a plurality of nozzles which can eject ink for use in recording are aligned/arranged at predetermined intervals in a direction parallel with a feeding direction of a recording sheet.
  • the ink jet head is disposed in such a manner that a tip end of each nozzle is opposed to a recording surface of the platen.
  • the plurality of ejecting nozzles are used in order to increase the printing speed.
  • a plurality of ejecting nozzles are arranged adjacent to one another. After a plurality of lines are recorded by ejecting ink via all the nozzles, line feeding operation is performed, before the ink is repeatedly ejected via all the nozzles.
  • accuracy in pitch feed becomes a problem. For example, when n nozzles are arranged adjacent to one another, n pitch feed is repeated. A gap between lines block before or after the n pitch feed needs to be the same as an interval between the adjacent nozzles, which is difficult.
  • a plurality of ( n ) nozzles are arranged at constant intervals (the number of pitches is generally less than n ), and scanning is performed so as to fill a gap between recorded lines (interlace system).
  • ink ejecting nozzle position A relationship of ink ejecting nozzle position, carriage moving direction and recording sheet moving direction in the conventional ink jet printer will be described with reference to Fig. 7, in which the number of nozzles is five. Additionally, the relationship of nozzle position, carriage moving direction and recording sheet moving direction can be applied in the present invention.
  • nozzles N1, N2, N3, N4, N5 in total which can eject desired ink to form dot image on a recording sheet, are aligned/arranged in a direction parallel with a recording sheet feeding direction.
  • code N generically indicates the nozzle, and numerals 1 to 5 affixed to the code N indicate nozzle numbers in sequence from the top of the feeding direction of the recording sheet.
  • the ink jet head H moves along the carriage moving direction shown by a lateral arrow in Fig. 7. During the movement, ink is ejected via the ink ejecting nozzles to form an image for one line of nozzles.
  • the recording sheet is fed in a feeding direction shown by an upward arrow in Fig. 7 by line feeding operation.
  • the number of feeding pitches of the recording sheet corresponds to the total number n of nozzles, i.e., n pitch or five pitch feed is performed.
  • the line feeding operation in which the recording sheet is fed by five pitch feed
  • the image forming operation in which the carriage with the ink jet head H mounted thereon is moved along the platen and simultaneously operated based on predetermined recording information to eject ink onto the recording sheet and form a line unit recorded image of each nozzle N1, N2, N3, N4, N5 on the recording sheet. Desired image is recorded on the recording sheet in this manner.
  • the carriage moves from the left toward the right in the first image forming operation, and all the nozzles N1, N2, N3, N4, N5 eject ink. Therefore, as shown in Fig. 8, the recorded image of each line is formed by each of the nozzles N1 to N5 to first form the recorded image of five lines in total.
  • the line feeding operation is performed. Specifically, the n pitch feed of the recording sheet, i.e., the five pitch feed is performed.
  • the n pitch feed of the recording sheet i.e., the five pitch feed is performed.
  • ink is ejected from all the nozzles N1 to N5. Therefore, as shown in Fig. 9, each new line of recorded image formed by the nozzles N1 to N4 is recorded just below each recorded image line formed by the nozzles N2 to N5 in the previous image forming operation.
  • a new line by the nozzle N5 is formed five pitches below the line formed by the nozzle N5 in the previous image forming operation.
  • each line of recorded image is formed as shown in Figs. 10, 11.
  • no recorded image can be formed in an area A of three lines, an area B of two lines, or an area C of one line.
  • the nozzle N does not actually eject ink while scanning an area denoted by code D in Fig. 11. Specifically, the line of the recorded image first formed by the nozzle N4 is regarded as a recording start position of the recorded image. Therefore, the area D cannot be used in recording, which is wasteful.
  • the present invention has been accomplished in consideration of the above circumstances, and a first object thereof is to provide a recording method of an ink jet printer which can prevent a non-recorded area unable to be used in recording from being generated in a top end of a feeding direction of a recording sheet.
  • a second object is to provide a printer for direct use in implementing the method.
  • the first object is attained by a recording method of an ink jet printer for recording a desired image on a recording sheet by repeating:
  • a control for a variable feeding pitch of the recording sheet and a control of ink ejecting of each nozzle are performed to prevent a non-recorded area unable to be used in recording from being generated in a top end of the feeding direction of the recording sheet.
  • control for the variable feeding pitch and the control of ink ejecting of each nozzle can be performed in the recording method of the ink jet printer, for example, comprising the steps of:
  • step d) in the i -th ( 1 ⁇ i ⁇ m-1 ) n pitch feed, [i ⁇ n/m] + 1 nozzles, represented by Gauss' notation, from the downstream side (terminal end) in the recording sheet feeding direction can be allowed to eject the ink.
  • the number of the ejectable nozzles from the downstream side is obtained only by adding one to an integer portion obtained by dividing i ⁇ n with m.
  • the second object of the present invention is attained by an ink jet printer for recording a desired image on a recording sheet by repeating;
  • the ink jet printer comprises a controller for performing a control for a variable feeding pitch of the recording sheet and a control of ink ejecting of each nozzle.
  • the ink jet printer preferably comprises:
  • all lines can be recorded without being overlapped or generating any gap.
  • the non-recorded area unable to be used in recording can securely be prevented from being generated in the top end of the feeding direction of the recording sheet.
  • the effective use of the recording sheet and the enlargement of the recorded area can easily be realized.
  • circled numbers indicate nozzle numbers for recording each recorded pixel line when the number of nozzles n is set to five and the pitch between nozzles m is set to four. Positions of nozzles N1 to N5 have a relationship shown in Fig. 2.
  • the nozzles N1, N2, N3 are set non-ejectable, while only the nozzles N4, N5 are set ejectable (in Fig. 4B, the non-ejectable nozzles are shown by crosses, while the ejectable nozzles are shown by circles).
  • Fig. 4B only new lines 21, 25 of recorded image by the nozzles N4, N5 are formed, and the recorded image is formed in 22 lines in total.
  • the nozzle positioned on the line with the image already formed thereon is controlled not to eject the ink.
  • the ejecting nozzles on the upstream side top end of the feeding direction
  • the three nozzles N3 to N5 are used, and in the third feed, four nozzles N2 to N5 are used.
  • any of the nozzles N1 to N5 does not overlap the recorded lines. Therefore, all the nozzles are used for recording (Fig. 4C).
  • the recorded image can easily and securely be formed from the first recording operation and from an origin of nozzle N1 without any interruption among the lines of the recorded image. Recording can securely be performed even in the non-recorded area which is heretofore generated in the top end of the feeding direction of the recording sheet and which cannot be used in recording. As a result, the effective use of the recording sheet and the enlargement of the recorded area can easily be realized.
  • Figs. 5A to 5C show a recorded image forming operation when the number of nozzles n is set to seven and the pitch between nozzles m is set to four. Nozzle numbers for recording recorded pixel lines are shown by circled numerals.
  • n seven pitch feed
  • the image forming operation is performed by ejecting the ink only via the nozzles N6, N7 (the left side of Fig. 5B).
  • the recorded image is formed in such a manner that the ink is prevented from being ejected from the nozzles positioned on the recorded lines.
  • any one of the nozzles N1 to N7 does not overlap the recorded lines. Therefore, all the nozzles are used to perform recording (Fig. 5C).
  • the line feeding operations each of seven pitches are repeated, all the nozzles N1 to N7 fail to overlap the recorded lines, and the non-recorded area can be recorded without any gap.
  • the present invention makes it an object to finally allow all the nozzles to eject the ink while repeating the n pitch feed.
  • the area of m ⁇ n lines can be recorded without any gap by performing the n pitch feed m times. During this operation all the nozzles are ejectable.
  • n is indivisible by the number of pitches m, i.e., it should not be m multiplied by an integer: n ⁇ p ⁇ m , in which p is an integer.
  • n pm + q , in which q is smaller than m, and p, q are integers.
  • the uppermost nozzle overlaps the already recorded line after the n pitch feed is repeated p times.
  • Fig. 6 shows the positional relationship of each nozzle at the time of one pitch feed and n pitch feed. As seen from Fig. 6, at the first n pitch feed, the position of the uppermost nozzle N1 is m+n. When the n pitch feed is repeated p times, the position of the uppermost nozzle N1 is: m + pn
  • n pm + q in which p ⁇ 1, m ⁇ 2, 1 ⁇ q ⁇ m-1.
  • equations (7) and (9) indicate the same numeric value.
  • Equations (6) and (8) also indicate the same numeric value.
  • the m -th nozzle Nb is sure to overlap the c-th nozzle Nn.
  • the nozzle Nb-1 overlaps the c-th nozzle Nn-1.
  • the number of overlapped nozzles is b.
  • the generation of the overlapped lines indicates that a gap is generated by non-recorded lines.
  • the recording method of the present invention can be performed when the number of nozzles n and the pitch between nozzles m have the following relationship:
  • the recording sheet is fed n pitches, scanning is performed while only the nozzles not overlapping the already recorded line are made ejectable, and the line unit image is recorded. These operations are repeated m-1 times.
  • n pitch feed is performed once.
  • the result is shown on the right side of Fig. 6.
  • the amount fed in the downstream direction is n pitches. Only the nozzles positioned along the length of n pitches are ejectable.
  • 2q is smaller than m
  • the number is 2p .
  • the nozzle Nn is added, then the number of ejectable nozzles is 2p + 1 .
  • the number is 2p + 1
  • the number of ejectable nozzles is 2p + 2 .
  • the number of ejectable nozzles from the downstream side of the recording sheet feeding direction is: [i ⁇ n/m] + 1 while the number of non-ejectable nozzles from the upstream side of the feeding direction is: n - ([i ⁇ n/m] + 1)
  • Fig. 1 shows one embodiment of an ink jet printer according to the present invention.
  • a printer unit 2 of an ink jet printer 1 is supported by a pair of stands 4, 4.
  • a plurality of casters 3, 3 ... are attached to the stands 4, 4.
  • the stands 4, 4 are interconnected via an auxiliary frame 5 which is positioned in substantially the middle of each stand 4 in the vertical direction.
  • a plate-like platen 6 for defining a record face of a recording sheet is oriented upward in the printer unit 2.
  • a plurality of suction holes 7, 7 ... are formed in the top surface of the platen 6.
  • a pair of carriage shafts 8, 8 extending parallel relative to the longitudinal direction of the platen 6 are disposed behind the platen 6 of the printer unit 2.
  • a reciprocatable carriage 9 is disposed along the carriage shafts 8.
  • a carriage drive belt 10 positioned between the carriage shafts 8 is secured to the carriage 9.
  • the carriage drive belt 10 is operated by a drive device (not shown) and, as a result, the carriage 9 is reciprocated along the carriage shafts 8.
  • the carriage 9 constitutes nozzle moving means in the printer of the present invention.
  • An ink jet head H is disposed to the carriage 9 to face the platen 6. Ink ejecting nozzles are assembled in the ink jet head H to face a recording surface 6a of the platen 6. As shown in Fig. 2, the ink jet head H is provided with two head modules 30 provided for each of four colors of yellow (Y), magenta (M), cyan (C) and black (B), and eight head modules 30 are provided in total.
  • Y yellow
  • M magenta
  • C cyan
  • B black
  • the number n of nozzles N and the interval between adjacent nozzles N can optionally be selected in accordance with design concept or another requirement.
  • the structure of the ink ejecting nozzle N is the same as that of the conventional nozzle.
  • ink tanks 11 As shown in Fig. 1, four ink tanks 11, each thereof for each color, are disposed on one side (left side) in the rear of the printer unit 2.
  • the ink tank 11 is communicated with the head module 30 of the ink jet head H via a tube 12.
  • the tube 12 supplies ink to each nozzle N of the head module 30 for each color from each ink tank 11 via the carriage 9.
  • One end (left end in Fig. 1) of the platen 6 of the printer unit 2 is set in the home position of the ink jet head H.
  • a cap 13 is disposed in the position corresponding to the home position.
  • the cap 13 covers the head nozzles N, when not in use, to prevent the drying of ink inside the nozzles and the attachment of foreign particles. Moreover, the cap 13 sucks and collects the ink ejected by recovering operation of the nozzles N of the ink jet head H.
  • a feeding means or recording sheet feeding mechanism 34 is provided for feeding the recording sheet positioned between the platen 6 and the ink jet head H to the front of the printer unit 2.
  • the sheet can be fed by one pitch or n pitches as required.
  • the auxiliary frame 5 is provided with a recording sheet wind-up mechanism 14.
  • the wind-up mechanism 14 is provided with a pair of supports 15a, 15b positioned on opposite sides of the auxiliary frame 5.
  • one support 15a (left support in Fig. 1) is fixed to the auxiliary frame 5, while the other support 15b can be moved along the auxiliary frame 5.
  • a shaft support recess 17 open upward is formed in each of the supports 15a, 15b for supporting a wind-up shaft 16, and three support rollers 18 are rotatably arranged inside the shaft support recess 17.
  • the wind-up shaft 16 is rotatably and detachably supported by the support rollers 18.
  • a wind-up drive gear 19 is disposed under the shaft support recess 17 of the fixed support 15a, and one end of the wind-up shaft 16 is provided with a wind-up follower gear 20 engaged with the wind-up drive gear 19.
  • the wind-up shaft 16 is rotated/operated via the wind-up follower gear 20 by rotating/operating the wind-up drive gear 19.
  • a controller 21 for controlling the operation of each section of the ink jet printer 1 is disposed inside the printer unit 2.
  • the controller 21 is provided at least with CPU 22, a memory 23 formed of an appropriate volume of ROM, RAM, and the like, and a drive controller 24 for operating each printer section.
  • the memory 23 comprises an operation control program memory 25 for controlling recording operation and feeding operation of the printer.
  • a feeding pitch control program 26 for varying/controlling the feeding pitch of the recording sheet and an ejection control program 27 for controlling the ink ejecting of each nozzle N are stored in the operation control program memory 25.
  • control programs performs the variable control of the feeding pitch of the recording sheet and the ink ejecting of each nozzle in accordance with the principle of the present invention. Thereby, the non-recorded area which cannot be used in recording is prevented from being generated in the top end of the recording sheet feeding direction. All the recorded lines are recorded without overlapping one another or without generating any gap.
  • the recording sheet is fed between the platen 6 and the ink jet head H by the sheet feeding mechanism 34 to set the top end of the recording sheet in the feeding direction in a predetermined position. Thereafter, while the carriage 9 is reciprocated along the carriage shafts 8 by driving the carriage drive belt 10, the ink jet head H is operated based on recording information.
  • a desired image is recorded on the recording sheet by repeating the image forming operation in which the line unit recorded image of each nozzle N is formed on the recording sheet by ejecting the ink via the nozzles N and the line feeding operation in which the recording sheet is fed at a predetermined feeding pitch.
  • the wind-up drive gears 19 are rotated/operated in synchronization with the line feeding operation, and the recording sheet is taken up by the wind-up shaft 16 rotated/operated via the wind-up follower gear 20.
  • the operation for forming the recorded image onto the recording sheet is performed in accordance with the aforementioned principle.
  • the operation is performed as follows:
  • the carriage 9 In the first image forming operation, the carriage 9 is moved from the left to the right. During the operation, the ink is ejected via all of 51 nozzles by a control instruction transmitted from the controller 21 in accordance with the ejection control program 27.
  • any one of the 51 nozzles overlaps the recorded lines. Therefore, the image forming operation is performed using all the nozzles.
  • the recorded image can easily and securely be formed without any interruption between the lines of the recorded image from thebeginning of the recording operation while the nozzle N1 is used as an origin.
  • the present invention is not limited to the aforementioned embodiment, and can be modified variously as required.
  • the control for varying the feeding pitch of the recording sheet and the control of the ink ejecting of each nozzle are performed during the recording operation. Therefore, the non-recorded area which cannot be used in recording can be prevented from being generated on the top end of the recording sheet feeding direction. Recording can be performed even in the non-recorded area which is heretofore generated on the top end of the recording sheet feeding direction and which cannot be used in recording. As a result, the effective use of the recording sheet and the enlargement of the recording area can advantageously be realized.

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EP99101491A 1998-01-27 1999-01-27 Procédé d'enregistrement pour une imprimante à jet d'encre Withdrawn EP0931668A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1413098 1998-01-27
JP1413098 1998-01-27

Publications (2)

Publication Number Publication Date
EP0931668A2 true EP0931668A2 (fr) 1999-07-28
EP0931668A3 EP0931668A3 (fr) 2000-02-02

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Application Number Title Priority Date Filing Date
EP99101491A Withdrawn EP0931668A3 (fr) 1998-01-27 1999-01-27 Procédé d'enregistrement pour une imprimante à jet d'encre

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0936573A3 (fr) * 1998-02-17 2002-04-03 Seiko Epson Corporation Enregistrement par points avec plusieurs groupes de buses
WO2003004280A2 (fr) * 2001-07-05 2003-01-16 Creo Srl Systeme de jet d'encre a uniformite amelioree
CN102101384B (zh) * 2009-12-17 2014-04-16 北大方正集团有限公司 一种能处理打印断线的数码印刷设备及其控制方法
CN105328993A (zh) * 2014-07-02 2016-02-17 北大方正集团有限公司 喷头维护方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0679518A1 (fr) * 1994-03-02 1995-11-02 Seiko Epson Corporation Tête d'impression, notamment pour l'usage d'imprimante sérielle
EP0744706A2 (fr) * 1995-04-27 1996-11-27 Seiko Epson Corporation Appareillage et méthode pour l'impression à jet d'encre en couleur
EP0800923A2 (fr) * 1996-04-11 1997-10-15 Mitsubishi Denki Kabushiki Kaisha Imprimante à éléments multiples et méthode d'ajustement associée
WO1998045121A1 (fr) * 1997-04-08 1998-10-15 Seiko Epson Corporation Enregistrement de points a l'aide d'une pluralite de valeurs d'entree de sous-balayage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0679518A1 (fr) * 1994-03-02 1995-11-02 Seiko Epson Corporation Tête d'impression, notamment pour l'usage d'imprimante sérielle
EP0744706A2 (fr) * 1995-04-27 1996-11-27 Seiko Epson Corporation Appareillage et méthode pour l'impression à jet d'encre en couleur
EP0800923A2 (fr) * 1996-04-11 1997-10-15 Mitsubishi Denki Kabushiki Kaisha Imprimante à éléments multiples et méthode d'ajustement associée
WO1998045121A1 (fr) * 1997-04-08 1998-10-15 Seiko Epson Corporation Enregistrement de points a l'aide d'une pluralite de valeurs d'entree de sous-balayage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0936573A3 (fr) * 1998-02-17 2002-04-03 Seiko Epson Corporation Enregistrement par points avec plusieurs groupes de buses
WO2003004280A2 (fr) * 2001-07-05 2003-01-16 Creo Srl Systeme de jet d'encre a uniformite amelioree
WO2003004280A3 (fr) * 2001-07-05 2003-08-07 Creo Srl Systeme de jet d'encre a uniformite amelioree
CN102101384B (zh) * 2009-12-17 2014-04-16 北大方正集团有限公司 一种能处理打印断线的数码印刷设备及其控制方法
CN105328993A (zh) * 2014-07-02 2016-02-17 北大方正集团有限公司 喷头维护方法及装置

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