EP3772416A1 - Imprimante à plat - Google Patents

Imprimante à plat Download PDF

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Publication number
EP3772416A1
EP3772416A1 EP19198530.8A EP19198530A EP3772416A1 EP 3772416 A1 EP3772416 A1 EP 3772416A1 EP 19198530 A EP19198530 A EP 19198530A EP 3772416 A1 EP3772416 A1 EP 3772416A1
Authority
EP
European Patent Office
Prior art keywords
holes
printer
sectional
support plate
plate assembly
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
EP19198530.8A
Other languages
German (de)
English (en)
Other versions
EP3772416B1 (fr
Inventor
Aaron MAK
Christopher J. BORCHERT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Holding BV
Original Assignee
Canon Production Printing Holding BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Production Printing Holding BV filed Critical Canon Production Printing Holding BV
Publication of EP3772416A1 publication Critical patent/EP3772416A1/fr
Application granted granted Critical
Publication of EP3772416B1 publication Critical patent/EP3772416B1/fr
Active 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
    • 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
    • B41J11/02—Platens
    • B41J11/06—Flat page-size platens or smaller flat platens having a greater size than line-size platens
    • 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
    • B41J11/0085—Using suction for maintaining printing material flat

Definitions

  • the invention relates to a printer comprising a medium support plate assembly provided with through-holes.
  • a printer may for example be a flatbed printer comprising a scanning inkjet print head carriage.
  • the invention further relates to a method for printing on such a printer.
  • a flatbed printer having a medium support plate assembly provided with suction holes are known from e.g. EP2580062 A1 .
  • a flatbed printer comprises an inkjet print head carriage moveable over the medium support plate assembly for forming an image on substrates on the medium support plate assembly.
  • the medium support plate assembly is provided with a plurality of through-holes for applying an underpressure to one or more print substrates on the medium support plate assembly.
  • the underpressure further maintains the print surface of the substrates in a generally flat state on the medium support plate assembly. The flatness contributes to the print quality.
  • the medium support plate assembly It is known to divide the medium support plate assembly, such that it defines a plurality of suction zones, each suction zone having predetermined dimensions different from the other zones.
  • the suction zones correspond to e.g. commonly used substrate dimensions (e.g. A0, A1, A2, B0, etc.). It is known to provide e.g. a dedicated valve system for closing off uncovered suction zones in their entirety or to provide sealing masks with shapes and size corresponding to the layout of the suction zones.
  • Such solutions require additional components as well as operator time in applying them.
  • a printer according to claim 1 and a method according to claim 11 are provided.
  • an average cross-sectional through-flow area per unit area of through-holes positioned along a circumference of each zone is larger than the average cross-sectional through-flow area per unit area of through-holes in a central area of each respective zone.
  • each suction zone the average cross-sectional through-flow area per unit area is increased with respect to central area by providing through-holes along said circumference with a larger average cross-sectional area or in a denser grouping as compared to the central area of the suction zone.
  • the average cross-sectional through-flow area per unit area of through-holes positioned along the substantially entire circumference of each zone is larger than the average cross-sectional through-flow area per unit area of through-holes in a central area of each respective zone.
  • the circumference herein is an endless boundary line circumscribing the area of the substrate (or the suction zone). The effective open area of the through-holes is thus increased locally along the entire circumference of the suction zone.
  • the central area is thereby fully enclosed by an endless loop formed of through-holes having an average cross-sectional through-flow area per unit area larger than in the central area itself.
  • the average cross-sectional through-flow area per unit area of the through-holes at the circumference increases with a local radius of the curvature of the circumference at the respective through-holes. It was found that corners provide a greater risk of being released than straight edges. The inventors thus deduced that a greater radius of curvature of a portion of the circumference requires a higher through-flow of air to provide sufficient hold down. In consequence, the effective open area of through-holes at the corners is preferably made larger than along edges extending between corners.
  • the printer further comprises a spacer structure supporting the medium support plate assembly and a plurality of connection lines extending through the spacer structure for forming a fluid connection between the through-holes and a suction source.
  • the connection lines are distributed, such that a majority of and/or substantially all through-holes are spaced apart from a connection line by at most a small number of through-holes. Said number is preferably smaller than twenty, ten, five, or three.
  • the advantages of the locally increased cross-sectional through-flow may be improved by providing a low air resistance suction table below the medium support plate assembly.
  • a spacer structure is provided inside the suction table to support the medium support plate assembly.
  • connection line forms a relatively low air resistance connection to the suction source, which may for example be achieved by providing the connection lines with a sufficiently large cross-section. As such, efficient removal of air from the through-holes is achieved.
  • the printer further comprises a spacer structure releasably attachable to a bottom side of the medium support plate assembly, which spacer structure defines an air distribution manifold on the bottom side of medium support plate assembly.
  • the releasable spacer structure may for example be formed of magnetic spacer bars, which allow an operator to shape the air distribution manifold to suit a particular print job. Due to the relatively large size of the printer, the height of the releasable spacer structure is small compared to its length and width. The air flow chamber which holds the releasable spacer structure is thus relative narrow in the height direction. This results in a relatively high air flow resistance in the horizontal directions.
  • connection lines may be provided a sufficiently high density of the connection lines, such that substantially each through-hole is positioned relatively near or in proximity of a connection line.
  • the distance air needs to travel through the high resistance air flow chamber is thereby limited, reducing the impact of the narrow air flow chamber on the total air flow.
  • the entry openings of the connection lines are distributed over the area of the medium support plate assembly, such that no more than a small number of through-holes is positioned between nearest neighbors of the entry openings. Said small number is preferably no greater than 25, 20, 15, 10, 5, 3, or 1 through-holes.
  • Fig. 1 is a print system 5 (or printer) comprising a number of workstations 8B, 8C, which may be personal computers or other devices for preparing image data for prints to be printed. These workstations have access to a network N for transferring print jobs comprising the image data to a print controller 8A that is configured to receive the print jobs for prints and derive pass images.
  • the print controller 8A may be part of the print system 5 connected to a control unit of the print system 5 via a connection 6.
  • the print system 5 further comprises a print head 2 attached to an armature 7 for applying colorants, for example cyan (C), magenta (M), yellow (Y), black (K) and white (W) colorant, or varnish to pieces 9, 9A of flat print media placed on a flatbed surface 1 in order to obtain a printed image.
  • the armature 7 comprises a gantry above the flat bed surface 1 as shown in Fig. 1 moving in a plurality of directions over the flat bed surface 1.
  • the flatbed surface 1 is the surface of the flatbed which is at least partially printable by the print head 2.
  • the pieces of media may be so small that they are completely placed on the flatbed surface 1, but a piece of media which is larger than the flatbed surface, in which case an image which is going to cover the whole piece of media must be printed into a plurality of parts of the image, is not excluded.
  • a first piece 9A has already been printed upon, while the other pieces 91, 92 are not provided with any recording material yet.
  • the print head 2 reciprocally scans the flatbed surface 1 in the scanning direction X along a gantry 7 perpendicular to a non-scanning direction Y of the gantry 7 over the flatbed surface 1 along guiding parts 10. During printing of an image on the piece 9, 9A of media the piece 91, 92, 9A of media is not moved on the flatbed surface 1.
  • Such a print head may be moveable in at least one direction over the flatbed surface 1.
  • the piece of media 9A may have a thickness of 10 mm, while the pieces of media 91, 92 may have a thickness of 20 mm.
  • Fig. 2 illustrates a cross-section of the printer in Fig. 1 .
  • the suction table 12 is provided below the carriage holding the print heads 2, the suction table 12 is provided.
  • the suction table surface 1 is formed by the medium support plate assembly 1, which may comprise one more plates provided with through-holes.
  • a first spacer assembly 14 is provided below the medium support plate assembly 1 .
  • the first spacer assembly 14 is formed by a plurality of longitudinal spacer bars 14 which are releasably mounted in the suction table 12.
  • the spacer bars 14 may be repositioned on the bottom surface of the medium support plate assembly 1 to adjust the layout and dimensions of the first spacer assembly 14 to the requirements of an upcoming print job.
  • the spacer bars 14 comprise a magnetic material for releasably attaching these to the medium support plate assembly 1, which may be formed of a suitable material such as metal.
  • a suitable material such as metal.
  • the first spacer assembly 14 forms a first airflow chamber 15 wherein air may flow along the bottom surface of the medium support plate assembly 1.
  • the first spacer assembly 14 defines a manifold inside the first air flow chamber 15 for distributing air along at least a bottom portion of the medium support plate assembly 1.
  • a second spacer assembly 16 is provided inside the suction table 12 for supporting the first spacer assembly 14.
  • the first air flow chamber 15 is enclosed on opposite sides by respectively the medium support plate assembly 1 and the second spacer assembly 16.
  • the second spacer assembly 16 may for example be formed of a honeycomb structure to provide a low costs and flat support surface.
  • Connection lines 17 form fluid connections between the first air flow chamber 15 and a second air flow chamber 18 positioned on an opposite side of the second spacer assembly 16 as the first airflow chamber.
  • the connection lines 17 may be formed as tubes or pipes extending through the second spacer assembly 16 to fluidly connect the first and second airflow chambers 15, 18.
  • the second airflow chamber 18 comprises an opening which connects to a suction line 22 extending towards a suction source 20.
  • the suction source 20 may be a fan or pump for providing an underpressure in the second air flow chamber 18.
  • the height (measured perpendicular to the medium support plate assembly 1) of the second air flow chamber 18 is relatively large to provide low air resistance as compared to the first air flow chamber 15. With relatively low power of the suction source 20 sufficient underpressure may thus be achieved in the second airflow chamber 18.
  • the connection lines 17 provide a low air resistance fluid connection between the second air flow chamber 18 and the first air flow chamber 15 formed by the first spacer assembly 14.
  • the connection lines 17 are provided in relative close proximity, for example with at most 30, 25, 20, 15, or 10 cm between them. In consequence, the distance between through-holes in the medium support plate assembly 1 and the connection lines 17 is relatively small for all through-holes.
  • the height of the first air flow chamber 15 (i.e. the height of the spacer bars 14) may then be relatively small.
  • every substantially through-hole in the medium support plate assembly 1 has no more than 10, preferably no more than 5, very preferably no more than three, even more preferably no more than two through-holes between itself and its closest connection 17, when viewed from above.
  • the flatness of the medium support plate assembly 1 can thus be maintained without the relatively high air resistance of the narrow first airflow chamber 15 negatively affecting the air flow.
  • the distance the air travels through the first air flow chamber 15 is kept relatively small due to each through-hole being in close proximity to a connection line 17.
  • Fig. 3 schematically illustrates the distribution of the effective through-flow open area across the surface of the medium support plate assembly 1.
  • the top surface of the medium support plate assembly 1 is formed by one or more plates provided with a large number of through-holes.
  • the through-holes are in fluid connection to the suction source 20, e.g. in the manner shown in Fig. 2 .
  • Below the medium support plate assembly 1 an actuable seal 24 is provided below the medium support plate assembly 1 .
  • the seal 24 is configured to seal a first portion (left side in Fig. 3 with respect to the seal 24) of the suction table 12 from a second side (right side in Fig. 3 with respect to the seal 24).
  • the seal 24 may be controlled via an actuator for providing a fluid connection between the first and second portion or sealing these off from one another. This allows an operator to actively work on one portion of the medium support plate assembly 1 to remove and place substrates while simultaneously printing on substrates in place on the second portion.
  • the medium support plate assembly 1 comprises a plurality of suction zones Z1-Z10, each having predetermined dimensions corresponding to commonly used substrate dimensions. As can be seen, the suction zones Z1-Z10 overlap to provide a space efficient arrangement. A substrate is to be placed in a suction zone Z1-Z10 with the corresponding dimensions. Even while sealing of the first portion of the suction table 12 from the second portion, a substantial number of through-holes then remain uncovered by the substrate. The number varies on the size of the substrate used.
  • Each suction zone Z1-Z10 is formed by a central area A with through-holes H1 having a first average cross-sectional area.
  • the central area A of each suction zone Z1-Z10 is circumscribed by a circumference C comprising through-holes H2, H3 with a second average cross-sectional area different from the first.
  • the central area A forms the majority of each suction zone Z1-Z10 and thus forms a significantly larger area portion of the medium support plate assembly 1 than the latter circumference C.
  • the area ratio of the central area A as compared to that of the circumference C may, for example, be at least a factor 10, 20, 30, 50, or 100.
  • the majority of the through-holes H1 are provided with a relatively small effective cross-sectional area. This may be achieved by a small open area per through-hole and/or a low density of through-holes per unit area. A small effective cross-sectional area leads to low through-flow, which is effective against leak air, but was found to negatively affect the holding down of the substrate.
  • These through-holes H1 with a relavtively small effective cross-sectional area are positioned in the central areas A and define the larger portion of the medium support plate assembly 1.
  • the circumference C of the suction zones Z1-Z10 are configured to provide a relatively higher through-flow of air than through-holes H1 positioned away from said circumferences H2, H3.
  • the cross-sectional open area per through-hole H2, H3 and/or the through-hole density at the circumferences C is thereto greater than in the remainder of the medium support plate assembly 1, specifically great than in the central areas A of each suction zone Z1-Z10.
  • the corners H3 of the circumference C H3 are provided with an even greater average cross-sectional through-flow area per unit area than the rest of the circumference H2, specifically the straight portions H2 connecting the corners H3.
  • the average cross-sectional through-flow area per unit area is greater than in the central area A along the full length of the circumference C of each suction zone Z1-Z10.
  • Fig. 4 illustrates in an exaggerated view an embodiment of the medium support plate assembly 1 according to the present invention.
  • the average cross-sectional through-flow area per unit area is substantially determined by the effective through-flow area of each opening or through-hole H1-H4.
  • a greater opening results in a lower air resistance, and thus an increased amount of air flow flowing through said area as compared to a similar area in the central area A.
  • this effect is improved by the relatively low air resistance of the suction table 12 as shown in Fig. 2 .
  • the density of the low air resistance connection lines 17 is sufficiently high, such that most or each through-hole H1-H4 is positioned relatively close to a connection line 17.
  • Fig. 4 defines multiple suction zones Z1-Z3.
  • the suction zones Z1-Z3 have different dimensions but are provided in an overlapping configuration. Part of the circumference C of the first suction zone Z1 forms overlaps and/or forms part of the circumference C of the other suction zones Z2-Z3.
  • Each suction zone Z1-Z3 comprises a boundary line C, which is formed as an endless loop C around a central area A of each suction zone Z1-Z3.
  • the through-holes H2-H4 forming the looped boundary line C of the circumference are substantially all greater in area than the through-holes H1 in the central area A circumscribed by said boundary line C.
  • the relative area of through-the holes H3, H4 is greater as compared to the straight sections CE of the circumference.
  • the larger through-holes H3, H4 are positioned at the corners CC and exceed in size the through-holes H2 along the straight edges CE of the suction zones Z1-Z3.
  • the through-holes H2 at the straight edges CE are larger than those through-holes H1 remote from the boundary line of the circumference. In consequence, a relatively large air flow may be achieved at the edge area or zone C of the suction zones Z1-Z3, while air flow in minimized in the central areas A. This allows for printing with uncovered through-holes H1, improving producitivity by reducing the substrate preparation time.
  • the air flow over the table 12 is kept relatively small due to the reduced cross-sectional open area of the through-holes H1-H4.
  • the trajectory of droplets jetted from the print heads 2 is not or minimally affected by said air flow, improving the droplet positioning accuracy and thereby the print quality.
  • contamination of the table 12 due to misplaced ink droplets is reduced, such that less downtime for cleaning is achieved.
  • Fig. 5 illustrates a similar configuration as in Fig. 4 .
  • the average cross-sectional through-flow area per unit area is substantially determined by the density of similar sized through-holes H1-H4 per unit area.
  • Substantially all through-holes H1-H4 in Fig. 5 have the same cross-sectional open area through which air may pass.
  • the density or number of through-holes per unit area is increased along the circumference C with respect to the density in the central areas A of each suction zone Z1-Z3. Whether the density or the area per through-hole is increased as in Fig. 4 , the result is an increase in the open through-flow area per unit area along the circumference C.
  • the effective open area per unit area may be kept small to reduce leak air, but also to reduce the velocity of air around the print head carriage 2 during printing. The latter reduces contamination and improves print quality as less air disturbance results in an improved control over the positioning of the ink droplets on the substrates 91, 92.
  • the greater cross-sectional through-flow area at the circumference C during printing provides sufficient holding down of the regions of the substrate most likely to become released.
  • Fig. 6 illustrates a method for printing on the printer in Fig. 1 .
  • the substrates 91, 92 are placed in their respective suction zones Z1-Z3.
  • Each substrate 91, 92 is compared to in size and shape to the suction zones Z1-Z3 to select the suction zone Z1-Z3 with the suitable dimensions.
  • the suction source 20 is activated.
  • the substrates 91, 92 are thereby adhered to the medium support plate assembly 1. Since the majority of the uncovered through-holes H1-H4 is of the smaller average cross-sectional through-flow area per unit area, the air resistance of the uncovered areas is relatively high.
  • the average cross-sectional through-flow area per unit area is preferably averaged over a plurality of neighboring through-holes, for example at least three, preferably at least five, and very preferably at least ten through-holes.
  • Through-holes H1 with the lowest density or smallest area may also be locally positioned along or in the circumference C, while these in combination with surrounding through-holes H2-H4 with increased cross-sectional through-flow area still result in an increased average cross-sectional through-flow area per unit area with respect to the central area A.

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EP19198530.8A 2019-08-08 2019-09-20 Imprimante à plat Active EP3772416B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19190835 2019-08-08

Publications (2)

Publication Number Publication Date
EP3772416A1 true EP3772416A1 (fr) 2021-02-10
EP3772416B1 EP3772416B1 (fr) 2023-06-07

Family

ID=67587541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19198530.8A Active EP3772416B1 (fr) 2019-08-08 2019-09-20 Imprimante à plat

Country Status (1)

Country Link
EP (1) EP3772416B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298277A (en) * 1980-01-10 1981-11-03 Xerox Corporation Grooved vacuum belt document handling system
US20100238249A1 (en) * 2009-03-19 2010-09-23 Xerox Corporation Vacuum transport device with non-uniform belt hole pattern
EP2580062A1 (fr) 2010-06-14 2013-04-17 OCE-Technologies B.V. Élément de support de milieu
WO2014002080A1 (fr) * 2012-06-25 2014-01-03 Hewlett-Packard Industrial Printing Ltd. Ensemble de trous de vide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298277A (en) * 1980-01-10 1981-11-03 Xerox Corporation Grooved vacuum belt document handling system
US20100238249A1 (en) * 2009-03-19 2010-09-23 Xerox Corporation Vacuum transport device with non-uniform belt hole pattern
EP2580062A1 (fr) 2010-06-14 2013-04-17 OCE-Technologies B.V. Élément de support de milieu
WO2014002080A1 (fr) * 2012-06-25 2014-01-03 Hewlett-Packard Industrial Printing Ltd. Ensemble de trous de vide

Also Published As

Publication number Publication date
EP3772416B1 (fr) 2023-06-07

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