EP4360895A1 - Vorrichtung und verfahren zum tintenstrahldrucken von bekleidungsstücken und zubehör, insbesondere leder und/oder polyurethan - Google Patents

Vorrichtung und verfahren zum tintenstrahldrucken von bekleidungsstücken und zubehör, insbesondere leder und/oder polyurethan Download PDF

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Publication number
EP4360895A1
EP4360895A1 EP23198719.9A EP23198719A EP4360895A1 EP 4360895 A1 EP4360895 A1 EP 4360895A1 EP 23198719 A EP23198719 A EP 23198719A EP 4360895 A1 EP4360895 A1 EP 4360895A1
Authority
EP
European Patent Office
Prior art keywords
clothing
accessory
item
printing
support device
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.)
Pending
Application number
EP23198719.9A
Other languages
English (en)
French (fr)
Inventor
Gianluca MATASSINI
Matteo MORI
Alberto Mattia ARTIOLI
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.)
Seriscreen Srl
Original Assignee
Seriscreen Srl
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 Seriscreen Srl filed Critical Seriscreen Srl
Publication of EP4360895A1 publication Critical patent/EP4360895A1/de
Pending 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
    • 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
    • B41J3/4078—Printing on textile
    • 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
    • B41J11/0015—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 for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • 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
    • 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
    • B41J3/40731—Holders for objects, e. g. holders specially adapted to the shape of the object to be printed or adapted to hold several objects

Definitions

  • the present invention relates to an apparatus and method for ink jet printing items of clothing and accessories, in particular in leather and/or polyurethane.
  • the head may not be brought in close to all the parts to be printed, but may only be placed in the vicinity of the convex or flat portions; for this reason, the concave portions will be significantly farther away than the flat or convex portions, and the accuracy of printing on these portions, or near the transition zones between the flat/convex and concave portions, will be irreparably compromised.
  • an apparatus for ink jet printing items of clothing and accessories in particular in leather and/or polyurethane, is globally denoted with 4.
  • items of clothing and accessories may include, for example, handbags, footwear, belts, purses, cases and the like. This list is indicative and not exhaustive. The same applies to materials which may include leather, leatherette, plastic, rubber and the combinations thereof. "Combinations" means that the same object may comprise a plurality of portions having different geometries and different materials. This is the case, for example, with footwear that may include a leather, cloth or plastic upper that connects to a rubber and/or plastic sole.
  • the apparatus 4 comprises at least one ink jet printing head 8 slidable along a longitudinal printing axis L-L, and a base 12 for supporting at least one item of clothing or accessory 16 to be printed.
  • the base 12 is provided with at least one charging plate 14 that, as further described below, is configured to electrostatically charge the item of clothing or accessory 16.
  • the printing head 8 is supported so that it may reach the portions of the item of clothing or accessory 16 along its travel parallel to the longitudinal printing axis L-L.
  • the printing head 8 it is also possible to provide for the printing head 8 to translate perpendicularly to said longitudinal printing direction, along a transverse direction Y-Y, which identifies with the longitudinal printing axis L-L a printing plane parallel to the base 12. It is also provided for the printing head 8 to translate along a vertical direction Z-Z, perpendicular to the transverse direction Y-Y and the longitudinal printing axis L-L.
  • the item of clothing or accessory 16 is supported by a support device 20, electrically connected to the charging plate 14.
  • the apparatus 4 comprises electrostatic charging means 24 electrically connected to the printing head 8 and to the at least one charging plate 14, so as to charge the printing head 8 and the at least one charging plate 14, and by means thereof, the support device 20, with opposite electrostatic charges.
  • the electrostatic charging means 24 comprise an electrostatic generator with dual polarity +/-, individually selectable.
  • the voltage value provided by said electrostatic generator is preferably in the range of 4 KV to 20 KV, for example, viewable on the integrated display.
  • the at least one charging plate 14 comprises a plurality of resistors connected in parallel with said electrostatic charging means 24.
  • a plurality of charging plates 14 comprising a plurality of resistors or pins all connected in parallel with said electrostatic charging means 24 is provided.
  • the at least one charging plate 14 is at least partially covered with a layer of ionizing dark rubber 28 in which said resistors or pins are embedded.
  • said ionizing dark rubber layer 28 comprises epoxy resins and two-component mixing rubber.
  • the at least one charging plate 14 is electrically connected to the electrostatic charging means 24 by means of at least one insertion plug 32.
  • This type of connection a plug-in type, is very useful in that it allows the single electrostatic charging plate 24 to be connected and disconnected quickly, for example to make a replacement, without having to interrupt the operation of the other charging plates 14 in the apparatus 4.
  • the at least one electrostatic charging plate 24 is detachable from the base 12 by means of mechanically removable stops 36. Due to said stops 36 it is possible to remove and reconnect the single charging plate 24 without compromising the operation of the other units.
  • the at least one charging plate 24 has a greater extension or area 40 with respect to the support device 20, as well as the corresponding item of clothing or accessory 16, with respect to a projection plane on the base 12, so as to comprise and fully include the projection of the support device 20 and of the item of clothing or accessory 16 to be printed.
  • This ensures complete ionization of the item of clothing or accessory 16 and ensures that the ink injected by the printing head 8 propagates in the vertical direction Z-Z, without diverging in a cone, as occurs in the absence of electrostatic charges.
  • the electrostatic attraction between the printing head 8 and the item of clothing or accessory 16, which are charged with electrical charges opposite to each other prevents the ink from propagating according to a cone and creating inevitable smudges on the item of clothing or accessory 16.
  • the support device 20 comprises a resting base 44, associated and electrically connected with said at least one charging plate 14, and a cantilevered element 48, with respect to the resting base 44, configured to support the item of clothing or accessory 16 to be printed.
  • the resting base 44 is made of electrically conducting material so as to receive the electrostatic charge from the charging plate 16 with which it is in contact.
  • the cantilevered element 48 is electrically connected to the resting base 44 and is in turn made of electrically conducting material so that it may transfer the electrostatic charge to the item of clothing or accessory 16 it supports and with which it is at least partially in contact.
  • the cantilevered element 48 comprises support portions 52 configured to support, in a given position or with a given curvature or flatness, at least a portion of the item of clothing or accessory 16 to be printed.
  • Said support portions 52 serve, for example, to ensure the repeatability of the printing process on repeated items of clothing or accessories 16 from the same batch. For example, due to the support portions 52, it is possible to curve, spread and/or flatten portions of a shoe upper to be printed in series.
  • the apparatus 8 is equipped with a first UV ray LED lamp 56 for drying the injected ink, arranged upstream of nozzles of the printing head 8 for the ink jet, along the longitudinal printing axis L-L.
  • the apparatus 8 is provided with a second UV ray LED lamp 60 for drying the injected ink, arranged downstream of nozzles of the printing head 8 for the ink jet, along the longitudinal printing axis L-L.
  • said UV ray lamps 56,60 are intended to allow almost instantaneous drying of the ink injected by the printing head 8.
  • the reason for this expedient is that the injected ink, due to the electrostatic attraction between the printing head 8 and the item of clothing or accessory 16, is aimed directly, without opening in a cone/fan, against the printing surface which, usually, has an irregular and non-planar geometry. For this reason, in the absence of a very rapid drying of the ink, it would quickly tend to run, creating unacceptable smudges that would lead to discarding the printed item of clothing or accessory 16.
  • said first and/or second UV ray LED lamps 56,60 are spaced apart from the nozzles of the printing head 8, along the longitudinal printing axis L-L, so as to preserve the quality of the printing head and ensure the drying of the injected ink.
  • the apparatus 4 comprises a projector 64 having a resting plane 68 for said support device 20 bearing the item of clothing or accessory 16 to be printed, and a projection head 72 configured to previously project the image to be printed directly on the item of clothing or accessory 8 mounted on the support device 20.
  • the resting plane 68 of the projector 64 is configured so as to exactly replicate the position of the support device 20 when positioned on the base 12 for the subsequent printing. In this way, the operator may previously verify the correct centering of the image to be printed with respect to the item of clothing or accessory 16 and thus the correct positioning of the item of clothing or accessory 16 with respect to the support device 20.
  • the apparatus 4 also has a processing and control unit programmed to first centre the image emitted by the projector 64, and then the printing emitted by the printing head 8, on the item of clothing or accessory 8 to be printed.
  • said processing and control unit is programmed to centre and project the image on the item of clothing or accessory 8 as a function of the distance, with respect to said vertical direction Z-Z, between the printing head 8 and the item of clothing or accessory 16 during the subsequent printing step.
  • said processing and control unit is programmed to control the injection of ink and the activation of said UV ray LED lamps 56,60 after each passage and injection of ink of the printing head 8 on the item of clothing or accessory 16 to be printed.
  • the apparatus 4 comprises a charging plate 14 or inductive plate, supplied with high voltage (> 10 KV) and low amperometric value, on which metal support devices 20 suitable for holding/supporting items of clothing or accessories 16, such as footwear or other dielectric objects, such as leather, plastic, wood are positioned.
  • a charging plate 14 or inductive plate supplied with high voltage (> 10 KV) and low amperometric value, on which metal support devices 20 suitable for holding/supporting items of clothing or accessories 16, such as footwear or other dielectric objects, such as leather, plastic, wood are positioned.
  • the inductive charge is transferred from the charging plate 14, by means of the resistors or pins immersed in the insulation itself, to the metal support. This results in an electrostatic "polarization" of the dielectric object (i.e., the item of clothing or accessory 16) supported by the sign corresponding to the voltage supplied.
  • the voltage value in KV may preferably be varied up to a maximum of 20 KV by the generator used.
  • the method of printing an item of clothing or accessory 16 comprises the steps of:
  • Printing performed in this way is smudge-free because, due to the electrostatic attraction between the ink of the printing head 8 and the item of clothing or accessory 16 (which are charged with electrical charges opposite to each other), the ink is not able to expand in a cone shape, as is usually the case in the injection heads of the prior art, so that it may be directed extremely precisely onto the surface to be printed, especially if said surface is irregular and inclined.
  • the method may comprise the steps of:
  • the method may also comprise the steps of:
  • the present invention overcomes the drawbacks of the prior art.
  • the cone of the injected ink is reduced until it is vertical/perpendicular to the point of printing, ensuring detail and quality, even at points farthest from the printing head, along said vertical direction.
  • the printing applications of the apparatus and method of the present invention are virtually unlimited since, by appropriately calibrating the intensity of the electrostatic charges applied to the printing head and charging plates, it is possible to print effectively and without smudging on an item of clothing or accessory having any type and/or geometric conformation.
  • the apparatus is easy to use: if one charging plate fails, it may be replaced without compromising the operation of the others.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Textile Engineering (AREA)
  • Ink Jet (AREA)
EP23198719.9A 2022-10-28 2023-09-21 Vorrichtung und verfahren zum tintenstrahldrucken von bekleidungsstücken und zubehör, insbesondere leder und/oder polyurethan Pending EP4360895A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200022257 2022-10-28

Publications (1)

Publication Number Publication Date
EP4360895A1 true EP4360895A1 (de) 2024-05-01

Family

ID=84943874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23198719.9A Pending EP4360895A1 (de) 2022-10-28 2023-09-21 Vorrichtung und verfahren zum tintenstrahldrucken von bekleidungsstücken und zubehör, insbesondere leder und/oder polyurethan

Country Status (1)

Country Link
EP (1) EP4360895A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060051518A1 (en) * 2002-07-10 2006-03-09 Lars Persson Method and apparatus for applying a coating on a three dimensional surface
US20090256897A1 (en) * 2007-03-27 2009-10-15 Michael Lane Polk Object holder for printing multiple images
US20140026773A1 (en) * 2012-07-25 2014-01-30 Nike, Inc. Projector Assisted Alignment and Printing
IT201900018125A1 (it) * 2019-10-07 2021-04-07 Muchcolours Srl Metodo per la decorazione di oggetti e relativo sistema.
CN213798797U (zh) * 2020-11-03 2021-07-27 晋江市无极激光工艺品工贸有限公司 一种鞋用喷绘机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060051518A1 (en) * 2002-07-10 2006-03-09 Lars Persson Method and apparatus for applying a coating on a three dimensional surface
US20090256897A1 (en) * 2007-03-27 2009-10-15 Michael Lane Polk Object holder for printing multiple images
US20140026773A1 (en) * 2012-07-25 2014-01-30 Nike, Inc. Projector Assisted Alignment and Printing
IT201900018125A1 (it) * 2019-10-07 2021-04-07 Muchcolours Srl Metodo per la decorazione di oggetti e relativo sistema.
CN213798797U (zh) * 2020-11-03 2021-07-27 晋江市无极激光工艺品工贸有限公司 一种鞋用喷绘机

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