EP2143560A1 - Bilderzeugungsvorrichtung - Google Patents

Bilderzeugungsvorrichtung Download PDF

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Publication number
EP2143560A1
EP2143560A1 EP09251718A EP09251718A EP2143560A1 EP 2143560 A1 EP2143560 A1 EP 2143560A1 EP 09251718 A EP09251718 A EP 09251718A EP 09251718 A EP09251718 A EP 09251718A EP 2143560 A1 EP2143560 A1 EP 2143560A1
Authority
EP
European Patent Office
Prior art keywords
carriage
mark
slant angle
scanning direction
main scanning
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
EP09251718A
Other languages
English (en)
French (fr)
Other versions
EP2143560B1 (de
Inventor
Yuichi Sakurada
Nobuyuki Satoh
Hiroshi Takahashi
Masato Kobayashi
Tomonori Kimura
Kazushi Takei
Yasuo Sakurai
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 Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of EP2143560A1 publication Critical patent/EP2143560A1/de
Application granted granted Critical
Publication of EP2143560B1 publication Critical patent/EP2143560B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04556—Control methods or devices therefor, e.g. driver circuits, control circuits detecting distance to paper
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
    • 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
    • B41J2/17503—Ink cartridges
    • B41J2/1752—Mounting within the printer
    • 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
    • B41J2/2135—Alignment of dots

Definitions

  • the present invention generally relates to an image forming apparatus having a carriage to which a recording head is attached for ejecting liquid droplets.
  • an inkjet recording apparatus using a recording head which ejects ink droplets has been well known.
  • the inkjet recording apparatus ejects the ink droplets on a transported recording medium and forms an image on the recording medium.
  • the recording medium includes paper, a sheet, an OHP sheet, and so on onto which the ink droplets can be adhered.
  • the image forming includes image recording, character printing, figure printing, and image transferring.
  • the inkjet recording apparatus there are a serial type image forming apparatus which forms an image on a sheet by ejecting ink droplets while moving the recording head in the main scanning direction, and a line type image forming apparatus which forms an image on a sheet by ejecting ink droplets without moving the recording head.
  • the image forming apparatus forms an image on a recording medium, for example, paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, and so on by ejecting ink droplets on the recording medium.
  • a recording medium for example, paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, and so on by ejecting ink droplets on the recording medium.
  • the image forming means to form not only a significant image, for example, a character, a figure, but also a simple image, for example, a pattern (by merely hitting the ink droplets on a recording medium).
  • ink means liquid by which an image can be formed, for example, recording liquid, fixing treatment liquid, and the like.
  • a carriage to which a recording head is attached is moved in the main scanning direction by being slidably guided by main and sub guiding members.
  • the carriage may be slanted in the height direction relative to the sheet transporting surface due to worn out parts of the main and sub guiding members with the passage of time.
  • distances (gaps) between nozzles disposed in the main scanning direction of the recording head and the sheet surface are different among positions in the main scanning direction. That is, flying distances of the ink droplets from the plural nozzles are different from each other, and ink droplet hitting accuracy on the sheet is decreased and image quality is degraded.
  • a light receiving sensor is secured to the carriage which moves in the main scanning direction.
  • the light receiving sensor detects two ink ejecting patterns; that is, an ink ejecting pattern (positional information of ink droplets) determined when the inkjet recording apparatus is delivered to a user from a manufacturer, and an ink ejecting pattern at each time of predetermined printed number of sheets which has been determined beforehand in the user in using environment. Then an ink ejection difference (positional shift of the ink droplets) between the two ink ejecting patterns in the total carriage moving range is calculated, and the ejection timing of the ink droplets from the nozzles of the recording head is adjusted based on the calculated difference.
  • an ink ejecting pattern positional information of ink droplets
  • a distance measuring unit is provided for measuring a distance between a printing head and a recording medium at each time of scanning, and liquid droplet ejecting timing is adjusted based on the measured distance.
  • an ink adhering position detecting unit is provided for detecting an adhering position of ink droplets on a recording medium beforehand when the ink droplets are ejected from a recording head at predetermined timing, and the ink droplet ejecting timing is adjusted based on the detected ink droplet adhering position.
  • an optical sensor detects a distance between a sheet and a head when a carriage scans the sheet, and a correction value of a shift amount to be generated is calculated from the detected distance, and the liquid droplet ejecting timing is corrected based on the correction value.
  • Patent Document 1 when the carriage has been slanted in the height direction with the passage of time, the light receiving sensor has been also slanted, and the detecting timing of the ink ejecting pattern has been also shifted. Therefore, the ink ejection positional difference between a reference position when the apparatus has been delivered to the user from the manufacturer and an actual ink ejection position when the user uses the apparatus cannot be accurately obtained.
  • an image forming apparatus in which a slant of a carriage in the height direction relative to a sheet transporting direction can be accurately detected.
  • an image forming apparatus includes a carriage which scans in a main scanning direction by being moved and includes a recording head having nozzles for ejecting liquid droplets, a first mark and a second mark disposed at positions facing a nozzle surface of the recording head by having different heights from each other, a detecting unit attached to the carriage for detecting the first mark and the second mark, and a slant angle detecting unit which detects a slant angle of the carriage in a height direction relative to the main scanning direction based on a detection result by the detection unit.
  • an image forming apparatus includes a first mark and a second mark facing a nozzle surface of a recording head in which heights of the first and second marks are different from each other, and a slant angle of a carriage in a height direction is detected based on detection results of the first and second marks. Therefore, the slant angle of the carriage in the height direction is accurately detected without consuming a sheet.
  • FIG. 1 is a perspective view of a structure of an image forming apparatus according to the embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a part of a mechanism of the image forming apparatus shown in FIG. 1 .
  • FIG. 3 is a perspective view of a part of the mechanism shown in FIG. 2 .
  • an inkjet recording apparatus is used as the image forming apparatus.
  • the inkjet recording apparatus is a serial type inkjet recording apparatus and includes a recording apparatus main body 1 and a table 2 on which the recording apparatus main body 1 is put.
  • a guide rod 3 and a guide rail 4 are hung between side plates (not shown), and a carriage 5 is slidably supported in the arrow direction A by the guide rod 3 and the guide rail 4.
  • a recording head 6 represents the eight recording heads.
  • the two recording heads 6 are positioned by being shifted in the main scanning direction and the sub scanning direction (the paper transporting direction) orthogonal to the main scanning direction.
  • a main scanning direction mechanism for moving the carriage 5 in the main scanning direction includes a driving motor 11 (main scanning direction motor), a driving pulley 12, a driven pulley 13, and a belt member 14.
  • the driving motor 11 is disposed at one side position in the main scanning direction.
  • the driving pulley 12 is rotated by the driving motor 11.
  • the driven pulley 13 is disposed at the other side position in the main scanning direction.
  • the belt member 14 is wound around the driving pulley 12 and the driven pulley 13.
  • a tension force is applied to the driven pulley 13 by a tension spring 15 in the outside direction (in the direction separating from the driving pulley 12).
  • the pulley shaft directions of the driving pulley 12 and the driven pulley 13 are along the ink (liquid) droplet ejecting direction.
  • the belt member 14 is formed of two independent timing belts 14A and 14B having rubber cogs.
  • the timing belts 14A and 14B are wound around the driving pulley 12 and the driven pulley 13 with no space between the timing belts 14A and 14B in the pulley shaft directions.
  • the timing belts 14A and 14B are partially supported at a belt fixing section 7 disposed at the back side of the carriage 5. That is, the timing belts 14A and 14B are disposed at one side of the carriage 5 in the direction orthogonal to the main scanning direction.
  • An encoder sheet (linear scale) 21 for detecting a main scanning direction position of the carriage 5 is disposed along the main scanning direction.
  • a value from the encoder sheet 21 is read by an encoder sensor 22 disposed at the carriage 5.
  • a sheet (paper) 10 is intermittently transported by a paper transporting mechanism (not shown) in a direction orthogonal to the main scanning direction of the carriage 5 (the sub scanning direction) shown by the arrow direction B with a guide of a platen member 20.
  • the platen member 20 is disposed along the main scanning direction region of the carriage 5 and faces the recording head 6 in the recording region.
  • a recovering and maintaining mechanism 8 for recovering the recording head 6 from bad conditions and maintaining the recording head 6 in good conditions is disposed at one end side region of the main scanning direction region.
  • main cartridges 9, which store corresponding color ink and supply the color ink to the recording head 6, are disposed under the other end side of the main scanning direction region or at the outside of the carriage moving region in the main scanning direction.
  • the main cartridges 9 are detachably attached to the recording apparatus main body 1.
  • FIG. 4 is a plan view of the platen member 20.
  • FIG. 5 is a front view of the platen member 20.
  • one recording head 6 is used.
  • the platen member 20 is disposed along the main scanning direction of the carriage 5 by facing a nozzle surface 6n for ejecting liquid droplets of the recording head 6, and groves 30 are formed at predetermined positions of the platen member 20.
  • the platen member 20 includes second surfaces 20b (sheet transporting surfaces for guiding the sheet 10) and first surfaces 20a which are bottom surfaces of the grooves 30.
  • the positions of the first surface 20a and the second surface 20b are different from each other in the height direction; that is, the distances from the nozzle surface 6n to the first surface 20a and the second surface 20b are different from each other.
  • the groove 30 also has a function to prevent cockling of the sheet 10 (waviness of the sheet 10) when the liquid droplets hit the sheet 10 (paper), and the depth of the groove 30 is approximately 1 mm.
  • a first mark 31 is formed on the first surface 20a and a second mark 32 is formed on the second surface 20b in the platen member 20.
  • the first and second marks 31 and 32 are shown as circles; however, the shapes of the first and second marks 31 and 32 are not limited to the circles.
  • the plural first marks 31 and the plural second marks 32 are formed in the platen member 20 in the main scanning direction of the carriage 5.
  • a mark reading sensor 33 formed of a reflection type photosensor, which detects the first and second marks 31 and 32, is disposed on a surface of the carriage 5 at a side where the recording head 6 is attached (at the side of the nozzle surface 6n).
  • FIG. 6 is a block diagram showing the controller 100 and the carriage 5.
  • the controller 100 includes a main controlling section 101, a head driving controller 102, a driving waveform storage unit 106, a main scanning direction motor driving circuit 107, a sub scanning direction motor driving circuit 108, and a communication circuit 110.
  • the main controlling section 101 includes a microcomputer formed of a CPU which controls all elements in the inkjet recording apparatus and works as a slant angle detecting unit of the carriage 5, a ROM, a RAM, an interface (I/F), and so on.
  • the head driving controller 102 controls and drives the recording head 6.
  • the driving waveform storage unit 106 stores driving waveform data to be applied to the recording head 6 by the head driving controller 102.
  • the main scanning direction motor driving circuit 107 drives the main scanning direction motor 11.
  • the sub scanning direction motor driving circuit 108 drives a sub scanning direction motor 16.
  • the communication circuit 110 communicates with an external apparatus.
  • the main controlling section 101 receives print data and so on from an external apparatus such as an information processing apparatus, for example, a personal computer, an image reading apparatus, for example, an image scanner, and an image taking apparatus, for example, a digital camera, by using the communication circuit 110 via a cable or a network.
  • an external apparatus such as an information processing apparatus, for example, a personal computer, an image reading apparatus, for example, an image scanner, and an image taking apparatus, for example, a digital camera
  • the RAM is used as a buffer and a work memory, and stores data
  • the ROM stores control routine software, font data, graphic functions, procedure data, and so on.
  • the head driving controller 102 includes a driving signal generating circuit which generates a driving waveform for driving an actuator unit of the recording head 6 by converting the driving waveform data stored in the driving waveform storage unit 106 into digital data.
  • the head driving controller 102 outputs print data of dot pattern data (bitmap data) sent from the main controlling section 101 and the generated driving waveform to a head driver (not shown) for driving the recording head 6 in the carriage 5.
  • the main controlling section 101 detects a position of the carriage 5 in the main scanning direction based on a signal output from the encoder sensor 22 and controls a moving and stopping position of the carriage 5. In addition, the main controlling section 101 obtains position signals (detection signals) of the first and second marks 31 and 32 from the mark reading sensor 33 of the carriage 5, and detects the slant angle of the carriage 5 in the height direction relative to the main scanning direction. Further, the main controlling section 101 controls output timing of the driving waveform data from the driving waveform storage unit 106 based on the detected slant angle of the carriage 5 in the height direction. With this, the correction of the liquid droplet ejection timing from the recording head 6 is controlled.
  • FIG. 7 is a diagram showing the slant angle of the carriage 5. As described above, in FIG. 7 , the slant angle of the mark reading sensor 33 is described.
  • the velocity of the carriage 5 is defined as Vcrg (carriage velocity)
  • the distance between the first and second marks 31 and 32 is defined as L
  • the time is defined as "t1" between when the mark reading sensor 33 of the carriage 5 moves from a carriage position A where the first mark 31 is detected to a carriage position B where the second mark 32 is detected.
  • t1 L / Vcrg. That is, "t1" is the time between when the mark reading sensor 33 detects the first mark 31 and the second mark 32.
  • the mark reading sensor 33 detects the first mark 31 at a carriage position A1 where is a nearer position of a carriage position A0 on a virtual line in the carriage moving direction.
  • FIG. 8 a mark detection time difference is generated between the time “t1" when the carriage 5 is not slanted (normal operation) and the time “t2" when the carriage 5 is slanted.
  • FIG. 8(a) shows the time “t1” in the normal operation
  • FIG. 8(b) shows the time "t2" when the carriage 5 is slanted.
  • “ta” is detection timing of the first mark 31 in the normal operation
  • tb is detection timing of the second mark 32 in the normal operation
  • ta1" detection timing of the first mark 31 when the carriage 5 is slanted.
  • the mark detection time difference ⁇ t can be obtained.
  • the angle ⁇ is obtained from the mark detection time difference ⁇ t, and the liquid droplet ejection timing is corrected by using the angle ⁇ .
  • FIG. 9 is a diagram showing a relationship between the detection of the first and second marks 31 and 32 and a clock frequency of the CPU in the main controlling section 101.
  • FIG. 10 is a table showing the relationship between the slant angle ⁇ of the carriage 5 and the mark detecting time difference ⁇ t based on the count value of the internal clock frequency.
  • the slant angle ⁇ is 0.01 °
  • the internal clock frequency is 80 MHz
  • the count value is 12.
  • FIG. 11 is a flowchart showing the processes for detecting the slant angle ⁇ of the carriage 5 and for calculating a correction value of the liquid droplet ejection timing.
  • mark detection scanning is started in which the mark reading sensor 33 detects the first and second marks 31 and 32 by moving the carriage 5 in the main scanning direction (S1). Then the mark reading sensor 33 detects the first and second marks 31 and 32 (S2).
  • the count value "n2" between detection of the first mark 31 and detection of the second mark 32 is obtained by counting the number of clocks (S3). Then a difference (n2 - n1) between the count value "n2” and the count value "n1" at the apparatus delivering time from the manufacturer stored beforehand is obtained (S4), and the slant angle ⁇ of the carriage 5 is obtained from the difference (n2 - n1) (S5).
  • a correction value for correcting the liquid droplet ejection timing from the nozzles of the recording head 6 is calculated and the correction value is stored in a storage unit (register) of the main controlling section 101 (S9 and S11).
  • a gap G1 between the nozzle line 6Na and the sheet 10 is smaller than a gap when the carriage 5 is not slanted, and a gap G2 between the nozzle line 6Nb and the sheet 10 is greater than the gap when the carriage 5 is not slanted.
  • FIG. 12 for example, in a case where liquid droplets are ejected from two nozzle lines 6Na and 6Nb arrayed in the main scanning direction of the recording head 6, when the carriage 5 is slanted in which the front side is higher than the back side of the carriage 5 in the carriage moving direction (the main scanning direction), a gap G1 between the nozzle line 6Na and the sheet 10 is smaller than a gap when the carriage 5 is not slanted, and a gap G2 between the nozzle line 6Nb and the sheet 10 is greater than the gap when the carriage 5 is not slanted.
  • FIG. 12 for example, in a case where liquid droplets are ejected from two nozzle lines 6Na and 6Nb arrayed in
  • FIG. 12 is a diagram showing the gaps G1 and G2 between the sheet 10 and the nozzle lines 6Na and 6Nb of the recording head 6 when the carriage 5 is slanted.
  • the liquid droplet ejection timing from the nozzle line 6Na is corrected to be slower than a case where the carriage 5 is not slanted
  • the liquid droplet ejection timing from the nozzle line 6Nb is corrected to be faster than the case where the carriage 5 is not slanted.
  • liquid droplet ejection timing from the nozzle line 6Nb can be corrected by determining that the liquid droplet ejection timing from the nozzle line 6Na is a reference, and vice versa. Further, the liquid droplet ejection timing among the plural recording heads 6 can be similarly corrected.
  • the carriage moving direction is described as one direction; however, since the carriage 5 can be moved in the other direction, when the carriage moving direction is the other direction, the detection order of the first and second marks 31 and 32 are reversed. Then, the slant angle ⁇ of the carriage 5 can be detected in the other direction.
  • the platen member 20 provides the first mark 31 and the second mark 32 whose distances to the nozzle surface 6n are different from each other, and the slant angle ⁇ of the carriage 5 is detected from the detected results of the first and second mark 31 and 32 by the mark reading sensor 33. Therefore, the slant angle ⁇ of the carriage 5 in the height direction relative to the carriage moving direction can be surely detected without consuming the sheet 10.
  • FIG. 13 is a plan view of the platen member 20 in the modified example of the embodiment of the present invention.
  • FIG. 14 is a front view of the platen member 20 in the modified example of the embodiment of the present invention.
  • a first reference mark 41 and a second reference mark 42 are newly provided on the second surface 20b of the platen member 20.
  • a distance L between the first and second reference marks 41 and 42 is the same as the distance L between the first and second mark 31 and 32.
  • the first and second reference marks 41 and 42 can be disposed on the first surface 20a of the platen member 20. That is, a height difference does not exist between the first and second reference marks 41 and 42.
  • the time (the count value of the clock frequency) between the detection of the first reference mark 41 and the detection of the second reference mark 42 is a constant.
  • FIG. 15 is a diagram showing a relationship between the first and second marks 31 and 32 and the first and second reference marks 41 and 42.
  • FIG. 16 is a flowchart showing the processes for detecting the slant angle ⁇ of the carriage 5 and for calculating a correction value of the liquid droplet ejection timing in the modified example of the embodiment of the present invention.
  • mark detection scanning is started in which the mark reading sensor 33 detects the first and second marks 31 and 32 and the first and second reference marks 41 and 42 by moving the carriage 5 in the main scanning direction (S21).
  • the mark reading sensor 33 detects the first and second marks 31 and 32 whose heights are different from each other (S22), and the count value "n2" between detection of the first mark 31 and detection of the second mark 32 is obtained by counting the number of clocks (S23).
  • the mark reading sensor 33 detects the first and second reference marks 41 and 42 whose heights are not different from each other (S24), and the count value "n1" between detection of the first reference mark 41 and detection of the second reference mark 42 is obtained by counting the number of clocks (S25).
  • a correction value for correcting the liquid droplet ejection timing from the nozzles of the recording head 6 is calculated and the correction value is stored in a storage unit (register) of the main controlling section 101 (S31 and S33).
  • the detection of the first and second marks 31 and 32 in a forward route and a return route of the carriage 5 in the carriage moving direction is described.
  • the first mark 31 on a virtual line (dotted line) is positioned on the same level as the position of the second mark 32, and the mark reading sensor 33 shown by an alternate two-dot broken line is positioned to read the mark 31 on the virtual line.
  • the mark reading sensor 33 detects the first mark 31 and the second mark 32 in this order and detects the first mark at faster timing than the timing when the carriage is not slanted. Therefore, a distance corresponding to the time between the detection of the first mark 31 and the detection of the second mark 32 becomes (L + ⁇ h tan ⁇ ) (L is the distance between the first and second marks 31 and 32 when the carriage 5 is not slanted).
  • the mark reading sensor 33 detects the second mark 32 and the first mark 31 in this order and detects the first mark 31 at faster timing than the timing when the carriage is not slanted. Therefore, a distance corresponding to the time between the detection of the second mark 32 and the detection of the first mark 31 becomes (L - ⁇ h tan ⁇ ).
  • the mark detection time difference ⁇ t can be obtained from ( ⁇ h tan ⁇ / Vcrg), the slant angle ⁇ of the carriage 5 can be obtained.
  • the slant angle ⁇ of the carriage 5 can be individually obtained in the forward direction and the return direction of the carriage 5, and the liquid droplet ejection timing from the recording head 6 can be corrected.
  • FIG. 18 is a diagram showing a relationship between a liquid droplet hitting positional shift due to a slant angle ⁇ of the carriage 5 and the correction of the liquid droplet ejection timing.
  • Vjet liquid droplet velocity
  • a gap between the recording head 6 and the sheet 10 is defined as "h”
  • a liquid droplet flying time is defined as "T2” when the carriage 5 is slanted by ⁇ ( ⁇ > 0)
  • the velocity Vjet becomes Vjet sin ⁇ in the horizontal direction, and the liquid droplet flying distance is increased.
  • h Vjet ⁇ T1
  • a hitting position x1 Vcrg ⁇ T1.
  • x1 Vcrg / Vjet ⁇ h.
  • h Vjet cos ⁇ ⁇ T2
  • a hitting position x2 (Vcrg sin ⁇ + Vcrg) ⁇ T2.
  • x2 (Vcrg sin ⁇ + Vcrg) ⁇ Vjet cos ⁇ /h.
  • the liquid droplet ejection timing is made to be faster by ⁇ x / Vcrg than when the carriage 5 is not slanted. With this, the liquid droplet hitting position is made to the same position as that when the carriage 5 is not slanted.
  • the delay time can be obtained from the slant angle ⁇ .
  • the liquid droplet ejection timing can be accurately corrected, and the image quality can be increased.
  • the image quality can be made high.
EP09251718A 2008-07-10 2009-07-03 Bilderzeugungsvorrichtung Not-in-force EP2143560B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008179667A JP5101416B2 (ja) 2008-07-10 2008-07-10 画像形成装置

Publications (2)

Publication Number Publication Date
EP2143560A1 true EP2143560A1 (de) 2010-01-13
EP2143560B1 EP2143560B1 (de) 2010-11-10

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Application Number Title Priority Date Filing Date
EP09251718A Not-in-force EP2143560B1 (de) 2008-07-10 2009-07-03 Bilderzeugungsvorrichtung

Country Status (4)

Country Link
EP (1) EP2143560B1 (de)
JP (1) JP5101416B2 (de)
AT (1) ATE487602T1 (de)
DE (1) DE602009000337D1 (de)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP2635015A3 (de) * 2012-03-01 2015-05-27 Ricoh Company, Limited Bildaufnahmeeinheit, Farbmessvorrichtung, Bilderzeugungsvorrichtung, Farbmesssystem und Farbmessverfahren

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101981085B1 (ko) * 2019-01-10 2019-05-22 주식회사 딜리 디지털 잉크젯 프린터의 헤드 캐리지 처짐 방지 장치

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DE602009000337D1 (de) 2010-12-23
ATE487602T1 (de) 2010-11-15

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