EP1034933A1 - An inkjet printer printing responsive to substrate movement - Google Patents

An inkjet printer printing responsive to substrate movement Download PDF

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Publication number
EP1034933A1
EP1034933A1 EP00301493A EP00301493A EP1034933A1 EP 1034933 A1 EP1034933 A1 EP 1034933A1 EP 00301493 A EP00301493 A EP 00301493A EP 00301493 A EP00301493 A EP 00301493A EP 1034933 A1 EP1034933 A1 EP 1034933A1
Authority
EP
European Patent Office
Prior art keywords
ink jet
jet printer
substrate
heads
path
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Withdrawn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
EP00301493A
Other languages
German (de)
French (fr)
Inventor
Richard Gardiner
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1034933A1 publication Critical patent/EP1034933A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B41J2/505—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 from an assembly of identical printing elements
    • B41J2/51—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 from an assembly of identical printing elements serial printer 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/0072—Handling wide cut sheets, e.g. using means for enabling or facilitating the conveyance of wide sheets
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/02—Framework
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/21—Line printing

Definitions

  • This invention relates to an ink jet printer and more particularly, but not necessarily exclusively, to a multi-colour ink jet printer and/or to a wide format ink jet printer which can print items such as corrugated cardboard, wallpaper and textiles.
  • an ink jet printer comprising a path along which a substrate to be printed can pass, an array of fixed ink jet heads each having a plurality of nozzles, the array comprising a plurality of rows of ink jet heads, each row extending transversely of the path and the rows being spaced apart from one another in the direction of the path, and means for firing the ink jet heads in response to movement of the substrate.
  • sensing means are provided for sensing the movement of the substrate along the path and for producing a signal to fire the ink jet heads each time the substrate moves a predetermined distance. This has the advantage that the speed of the substrate can vary without affecting the resolution of print quality. It also allows the substrate to be mechanically fed or hand fed to the printer.
  • each ink jet head has its own electronic control board with dedicated memory for storing data for operating the nozzles of the head.
  • the printer preferably, further comprises a plurality of distribution boards, each of which supplies information from a central processing unit to a group of head control boards.
  • the ink jet heads are arranged in a plurality of pairs of rows and each head has a heat sink attached thereto, the heat sinks of the two rows of heads of each pair of rows being arranged back to back and in contact with a common heat conductor. This minimises the space occupied by the ink jet heads.
  • the ink jet printer further comprises means for moving the ink jet heads away from the said path in a direction perpendicular or substantially perpendicular thereto.
  • the ink jet printer may further comprise means for detecting a tear in the substrate and for operating the moving means when a tear is detected to avoid damage to the ink jet heads.
  • the ink jet printer may further comprise means for sensing the thickness of the substrate and for operating the moving means to adjust the position of the ink jet heads according to the thickness of the substrate.
  • the said path of movement of the substrate is horizontal or substantially horizontal and the ink jet heads are arranged above the said path.
  • the ink jet printer may be provided in combination with a corrugating machine and/or a die cutting machine and may include means for synchronising the speed at which the substrate is fed or drawn through the ink jet printer with the speed at which the corrugating machine and/or the die cutting machine operates.
  • the printer shown therein is a multi-colour printer which typically has a printing image width of 1.3 metres and a printing image length of about 2 metres and which can be used for printing on any large substrate, typically plastics material, cardboard, wooden panels, textiles or paper rolls.
  • the printer could however be made larger for printing, for example, on carpet or much smaller for printing, for example, sheets of A3 paper.
  • the printer has a frame work structure 10 which supports a bed 11 defining a path A along which a substrate S to be printed can pass.
  • the ink jet printer also comprises an array of fixed ink jet heads 12 each having a plurality of nozzles and typically 128 nozzles.
  • the array comprises a plurality of rows of ink jet heads 12, each row extending transversely of the path A and the rows being spaced apart from one another in the direction of the path A, with a plurality of ink jet heads 12 in each row.
  • Each nozzle incorporates a piezo-electric element which, when activated, constricts an associated cavity for discharging an appropriate amount of ink to the substrate S.
  • the ink jet heads 12 are supported by cross beams 13 extending transversely of the path. Each head 12 has a heat sink 14 attached thereto and the heat sinks 14 are secured to a respective cross beam 13 which serves as a heat conductor. As best shown in Figure 3, the ink jet heads 12 are arranged in pairs of rows, the heat sinks 14 of the two rows of heads 12 of each pair of rows being arranged back to back and in contact with a common cross beam 13.
  • Each ink jet head 12 has its own electronic control board 15 with dedicated random access memory for storing data for operating the nozzles of the head.
  • Each control board 15 has its own address. This means that it is possible to pre-load any control board with any information at any time and, therefore, a particular image to be printed by each head can be stored by the dedicated memory of that head until no longer needed thereby significantly reducing the amount of data which has to be handled in order to operate all of the heads.
  • the printer In order to accept the back to back positioning of the heads 12, the printer is programmed to read the information in the reversed heads 12 (i.e. those heads on the downstream side of each beam 13) in the opposite direction. Therefore, for every line of code on a reversed head 12 the information is read backwards horizontally but still read forwards in the same vertical direction on the memory plane.
  • the ink jet printer further comprises a plurality of distribution boards 16, each of which supplies information from a central processing unit (not shown) to a group of head control boards 15. As shown in Figure 2, each distribution board 16 is associated wit six head control boards 15.
  • the ink is supplied to the heads 12 through pipes 17 which. run through the beams 13.
  • the heads are connected to respective control boards 15 by respective printhead connectors 18 and the control boards 15 are connected to respective distribution boards 16 by printhead driver connectors 19.
  • the ink jet printer includes a sensor 20 for sensing the movement of the substrate S along the path A and for producing a signal to fire the ink jet heads 12 each time the substrate S moves a predetermined distance.
  • the sensor 20 is in the form of a digital decoder 21 driven by a friction wheel 22.
  • the cross beams 13 are secured to longitudinal support beams 23 and these are attached to the lower ends of hydraulic rams 24 supported from the top of the framework structure 10.
  • the rams 24 can be operated in order to raise or lower the beams 13 and 23 so as to move the ink jet heads 12 towards or away from the path in a direction perpendicular or substantially perpendicular thereto.
  • the ink jet printer may also include one or more sensors (not shown) for detecting a tear in the substrate S and for operating the rams 24 to raise the ink jet heads 12 when a tear is detected.
  • the ink jet printer may also comprise one or more sensors (not shown) for sensing the thickness of the substrate S and for operating the rams 24 to adjust the position of the ink jet heads 12 according to the thickness of the substrate.
  • the printer is designed to operate with four different coloured inks, although it could be designed to operate with more or less coloured inks.
  • the ink jet heads 12 of each row are spaced apart from one another and the ink jet heads 12 of adjacent rows are staggered with respect to one another so that each group of three rows covers the full width of the printer.
  • the heads 12 produce one line of print.
  • the only limiting factor, therefore, on the speed at which the substrate S can be drawn through the printer is the speed of firing the heads 12.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

An ink jet printer comprises a path A along which a substrate S to be printed can pass and an array of fixed ink jet heads 12 each having a plurality of nozzles. The array comprises a plurality of rows of ink jet heads 12, each row extending transversely of the path and the rows being spaced apart from one another in the direction of the path. The printer also comprises means for firing the ink jet heads 12 in response to movement of the substrate S which may, for example, be detected by a sensor 20.

Description

  • This invention relates to an ink jet printer and more particularly, but not necessarily exclusively, to a multi-colour ink jet printer and/or to a wide format ink jet printer which can print items such as corrugated cardboard, wallpaper and textiles.
  • According to the present invention, there is provided an ink jet printer comprising a path along which a substrate to be printed can pass, an array of fixed ink jet heads each having a plurality of nozzles, the array comprising a plurality of rows of ink jet heads, each row extending transversely of the path and the rows being spaced apart from one another in the direction of the path, and means for firing the ink jet heads in response to movement of the substrate.
  • All previously wide format ink jet printers have moving heads as opposed to fixed heads. The present design allows for any size of construction within the constraints of current software and enables the speed of printing to be increased dramatically.
  • Preferably, sensing means are provided for sensing the movement of the substrate along the path and for producing a signal to fire the ink jet heads each time the substrate moves a predetermined distance. This has the advantage that the speed of the substrate can vary without affecting the resolution of print quality. It also allows the substrate to be mechanically fed or hand fed to the printer.
  • Advantageously, each ink jet head has its own electronic control board with dedicated memory for storing data for operating the nozzles of the head.
  • In this case, the printer, preferably, further comprises a plurality of distribution boards, each of which supplies information from a central processing unit to a group of head control boards.
  • Advantageously, the ink jet heads are arranged in a plurality of pairs of rows and each head has a heat sink attached thereto, the heat sinks of the two rows of heads of each pair of rows being arranged back to back and in contact with a common heat conductor. This minimises the space occupied by the ink jet heads.
  • Preferably, the ink jet printer further comprises means for moving the ink jet heads away from the said path in a direction perpendicular or substantially perpendicular thereto. In this case, the ink jet printer may further comprise means for detecting a tear in the substrate and for operating the moving means when a tear is detected to avoid damage to the ink jet heads. Additionally or alternatively, the ink jet printer may further comprise means for sensing the thickness of the substrate and for operating the moving means to adjust the position of the ink jet heads according to the thickness of the substrate.
  • Preferably, the said path of movement of the substrate is horizontal or substantially horizontal and the ink jet heads are arranged above the said path.
  • The ink jet printer may be provided in combination with a corrugating machine and/or a die cutting machine and may include means for synchronising the speed at which the substrate is fed or drawn through the ink jet printer with the speed at which the corrugating machine and/or the die cutting machine operates.
  • The invention will now be more particularly described with reference to the accompanying drawings, in which:-
  • Figure 1 is a side view of one embodiment of an ink jet printer according to the present invention,
  • Figure 2 is a fragmentary perspective view from above showing the arrangement of the ink jet heads,
  • Figure 3 is a fragmentary perspective view from below showing the ink jet heads and control circuitry therefore in more detail, and
  • Figure 4 is a schematic plan view of the ink jet heads.
  • Referring firstly to Figures 1 to 3 of the drawings, the printer shown therein is a multi-colour printer which typically has a printing image width of 1.3 metres and a printing image length of about 2 metres and which can be used for printing on any large substrate, typically plastics material, cardboard, wooden panels, textiles or paper rolls. The printer could however be made larger for printing, for example, on carpet or much smaller for printing, for example, sheets of A3 paper.
  • The printer has a frame work structure 10 which supports a bed 11 defining a path A along which a substrate S to be printed can pass. The ink jet printer also comprises an array of fixed ink jet heads 12 each having a plurality of nozzles and typically 128 nozzles. The array comprises a plurality of rows of ink jet heads 12, each row extending transversely of the path A and the rows being spaced apart from one another in the direction of the path A, with a plurality of ink jet heads 12 in each row.
  • Each nozzle incorporates a piezo-electric element which, when activated, constricts an associated cavity for discharging an appropriate amount of ink to the substrate S.
  • The ink jet heads 12 are supported by cross beams 13 extending transversely of the path. Each head 12 has a heat sink 14 attached thereto and the heat sinks 14 are secured to a respective cross beam 13 which serves as a heat conductor. As best shown in Figure 3, the ink jet heads 12 are arranged in pairs of rows, the heat sinks 14 of the two rows of heads 12 of each pair of rows being arranged back to back and in contact with a common cross beam 13.
  • Each ink jet head 12 has its own electronic control board 15 with dedicated random access memory for storing data for operating the nozzles of the head. Each control board 15 has its own address. This means that it is possible to pre-load any control board with any information at any time and, therefore, a particular image to be printed by each head can be stored by the dedicated memory of that head until no longer needed thereby significantly reducing the amount of data which has to be handled in order to operate all of the heads.
  • In order to accept the back to back positioning of the heads 12, the printer is programmed to read the information in the reversed heads 12 (i.e. those heads on the downstream side of each beam 13) in the opposite direction. Therefore, for every line of code on a reversed head 12 the information is read backwards horizontally but still read forwards in the same vertical direction on the memory plane.
  • The ink jet printer further comprises a plurality of distribution boards 16, each of which supplies information from a central processing unit (not shown) to a group of head control boards 15. As shown in Figure 2, each distribution board 16 is associated wit six head control boards 15.
  • As shown in Figure 3, the ink is supplied to the heads 12 through pipes 17 which. run through the beams 13. The heads are connected to respective control boards 15 by respective printhead connectors 18 and the control boards 15 are connected to respective distribution boards 16 by printhead driver connectors 19.
  • As shown in Figure 2, the ink jet printer includes a sensor 20 for sensing the movement of the substrate S along the path A and for producing a signal to fire the ink jet heads 12 each time the substrate S moves a predetermined distance. The sensor 20 is in the form of a digital decoder 21 driven by a friction wheel 22.
  • Also as shown in Figure 2, the cross beams 13 are secured to longitudinal support beams 23 and these are attached to the lower ends of hydraulic rams 24 supported from the top of the framework structure 10. The rams 24 can be operated in order to raise or lower the beams 13 and 23 so as to move the ink jet heads 12 towards or away from the path in a direction perpendicular or substantially perpendicular thereto.
  • The ink jet printer may also include one or more sensors (not shown) for detecting a tear in the substrate S and for operating the rams 24 to raise the ink jet heads 12 when a tear is detected.
  • The ink jet printer may also comprise one or more sensors (not shown) for sensing the thickness of the substrate S and for operating the rams 24 to adjust the position of the ink jet heads 12 according to the thickness of the substrate.
  • The printer is designed to operate with four different coloured inks, although it could be designed to operate with more or less coloured inks. As shown in Figure 4, there are twelve rows of ink jet heads 12, three rows being dedicated to each colour. The ink jet heads 12 of each row are spaced apart from one another and the ink jet heads 12 of adjacent rows are staggered with respect to one another so that each group of three rows covers the full width of the printer.
  • Each time a pulse is received from the digital decoder 21, the heads 12 produce one line of print. The only limiting factor, therefore, on the speed at which the substrate S can be drawn through the printer is the speed of firing the heads 12.

Claims (13)

  1. An ink jet printer comprising a path (A) along which a substrate (S) to be printed can pass, an array of fixed ink jet heads (12) each having a plurality of nozzles, the array comprising a plurality of rows of ink jet heads, each row extending transversely of the path and the rows being spaced apart from one another in the direction of the path, and means for firing the ink jet heads in response to movement of the substrate.
  2. An ink jet printer as claimed in claim 1, wherein sensing means (20) are provided for sensing the movement of the substrate along the path and for producing a signal to fire the ink jet heads (12) each time the substrate moves a predetermined distance.
  3. An ink jet printer as claimed in claim 1 or claim 2, wherein each ink jet head (12) has its own electronic control board (15) with dedicated memory for storing data for operating the nozzles of the head.
  4. An ink jet printer as claimed in claim 3, further comprising a plurality of distribution boards (16), each for supplying information from a central processing unit to a group of head control boards (15).
  5. An ink jet printer as claimed in any one of the preceding claims, wherein the ink jet heads (12) are arranged in a plurality of pairs of rows and each head has a heat sink (14) attached thereto, the heat sinks of the two rows of heads of each pair of rows being arranged back to back and in contact with a common heat conductor.
  6. An ink jet printer as claimed in claim 5, wherein the printer is programmed to read the information in the reversed heads backwards.
  7. An ink jet printer as claimed in any one of the preceding claims, further comprising means (24) for moving the ink jet heads (12) away from the said path in a direction perpendicular or substantially perpendicular thereto.
  8. An ink jet printer as claimed in claim 7, further comprising means for detecting a tear in the substrate and for operating the moving means when a tear is detected.
  9. An ink jet printer as claimed in claim 7 or claim 8, further comprising means for sensing the thickness of the substrate and for operating the moving means to adjust the position of the ink jet heads according to the thickness of the substrate.
  10. An ink jet printer as claimed in any one of the preceding claims, wherein the said path (A) of movement of the substrate is horizontal or substantially horizontal and the ink jet heads are arranged above the said path.
  11. A multi-colour ink jet printer as claimed in any one of the preceding claims.
  12. An ink jet printer as claimed in any one of the preceding claims in combination with a corrugating machine, means being provided for synchronising the speed at which corrugated cardboard is fed or drawn through the ink jet printer with the speed at which the corrugating machine operates.
  13. An ink jet printer as claimed in any one of the preceding claims in combination with a die cutting machine, means being provided for synchronising the speed at which a substrate is fed or drawn through the ink jet printer with the speed at which the die cutting machine operates.
EP00301493A 1999-03-09 2000-02-25 An inkjet printer printing responsive to substrate movement Withdrawn EP1034933A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9905249 1999-03-09
GB9905249A GB2343415C (en) 1999-03-09 1999-03-09 An ink jet printer

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