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
  • B41J2/015—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
  • B41J2/04503—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at compensating carriage speed
• • 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
  • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
  • B41J19/20—Positive-feed character-spacing mechanisms
  • B41J19/202—Drive control means for carriage movement
• • 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
  • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
• • 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
  • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
  • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
  • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects

Definitions

• Patent Literature 1 describes an invention that dynamically changes the timing of pulses for driving a printing head, based on the speed and acceleration of the carriage.
• the drive cycle of the inkjet is determined. Accordingly, when the conveyance speed of the inkjet head is not a constant speed, the drive cycle and the drive frequency of the inkjet head vary. After droplets are discharged, reverberation occurs in a pressure chamber of the inkjet head, and affects droplets to be discharged next and thereafter. Consequently, when the drive frequency of the inkjet head varies, the affecting degree by the reverberant also varies. Accordingly, the droplet speed of ink also varies. There has been a problem that possible variation in ink droplet speed varies droplet landing positions, and shading unevenness occurs in a formed image.
• FIG. 13 shows an example of the drive cycle of the inkjet head, and the droplet speed of ink when the conveyance speed of the inkjet head is not a constant speed.
• the abscissa axis indicates time (s) after start of driving the inkjet head
• the ordinate axis indicates the conveyance speed (m/s: solid line) of the inkjet head
• the drive cycle ( ⁇ s: broken line) of the inkjet head, and the ink droplet speed (m/s: chain line) are shown.
• the drive cycle of the inkjet head gradually decreases.
• the ink droplet speed is unstable and periodically varies, and the amplitude gradually increases.
• the present invention has an object to provide an inkjet recording device and a program that can achieve a more stable image quality in a formed image.
• An inkjet recording device 100 in this embodiment is, for example, an inkjet recording device that forms an image on a three-dimensional object or the like (recording medium), and includes a robot arm main body 11 that includes a carriage 111 mounted with inkjet heads 20 as shown in FIG. 1 .
• FIG. 2 is a block diagram showing a functional configuration of the inkjet recording device 100 in this embodiment.
• the inkjet head 20 discharges ink on a recording medium, and records an image or the like.
• Each inkjet head 20 includes a plurality of recording elements 20a, and a head driver 24.
• the controller 40 is a processor that includes a CPU 41 (Central Processing Unit) and a RAM 42 (Random Access Memory), and comprehensively controls various operations of the inkjet recording device 100.
• the CPU 41 performs various operation processes, and executes a control operation.
• the RAM 42 provides the CPU 41 with a working memory space, and stores temporary data.
• the controller 40 controls output of the drive waveform pertaining to an ink discharge operation at each inkjet head 20 to the recording elements 20a, based on image data to be recorded and on setting data pertaining to image recording.
• the controller 40 obtains, from the storage 50, a droplet speed and drive cycle characteristics table that is drive cycle dependency information on the droplet speed of ink discharged from the inkjet head 20. In this case, the controller 40 functions as an obtainer.
• the controller 40 corrects control parameters during discharge of ink from each inkjet head 20, based on at least one of the speed and the acceleration of the carriage 111, and on the drive cycle dependency information on the droplet speed. In this case, the controller 40 functions as a corrector.
• control parameters include image data, a discharge signal, and a drive waveform.
• the storage 50 stores the waveform setting data 51.
• the waveform setting data 51 stores waveform pattern data of the drive waveform to be output to each recording element 20a.
• the waveform pattern data stored here includes information on the start timing of the drive waveform, the pulse width, and the voltage amplitude associated with each time of ink discharge in a case in which multiple times of ink discharge are sequentially performed.
• the information on the pulse width may be a parameter obtained from the nonvolatile memory included in the inkjet head 20. These pieces may be digital data from which the drive waveform is generated by the drive waveform signal generator 30.
• the storage 50 stores the carriage coordinates and carriage speed table that indicates the correspondence relationship where the speed of the carriage 111 in the carriage coordinates indicating the predetermined position of the carriage 111 is preset.
• the carriage coordinates and carriage acceleration table indicating the correspondence relationship where the acceleration of the carriage 111 in the carriage coordinates is preset may be stored.
• the storage 50 stores the droplet speed and drive cycle characteristics table where the correspondence relationship between the droplet speed of ink discharged by the inkjet head 20 and the drive cycle of the inkjet head 20 is calculated by simulation.
• FIG. 3 shows an example of the drive cycle dependency of the ink droplet speed at the inkjet head 20. As shown in FIG. 3 , if the drive cycle of the inkjet head 20 is relatively short (e.g., 40 to 80 us), the ink droplet speed is unstable.
• the corrector corrects the control parameters.
• the inkjet recording device 100 in this embodiment adopts a three-dimensional object as an image formation target.
• the corrector corrects the control parameter through selection of a drive waveform.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Ink Jet (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=84526150

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (11)

• 2022
  • 2022-05-09 WO PCT/JP2022/019701 patent/WO2022264710A1/ja not_active Ceased
  • 2022-05-09 JP JP2023529675A patent/JP7845363B2/ja active Active
  • 2022-05-09 EP EP22824704.5A patent/EP4357137B1/en active Active

Also Published As

Similar Documents

Legal Events