Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H20/00—Advancing webs
  • B65H20/12—Advancing webs by suction roller
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/02—Conveying or guiding webs through presses or machines
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/08—Cylinders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
  • B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
  • B65H29/241—Suction devices
  • B65H29/243—Suction rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/40—Type of handling process
  • B65H2301/42—Piling, depiling, handling piles
  • B65H2301/421—Forming a pile
  • B65H2301/4212—Forming a pile of articles substantially horizontal

Definitions

• the present invention relates to a flat substrate transport cylinder, of the type having a cylindrical base body which has a cylindrical base body surface made of a first material and which has a plurality of openings opening on the cylindrical surface .
• Known devices for conveying printed products such as sheets of paper are known in the state of the art. These routing devices are for example used in offset printing machines to transport the printed sheets.
• These conveying devices comprise hollow transport rollers having a transport surface in contact with the sheet to be transported.
• the latter comprises recesses connected to a device for creating a vacuum.
• the present invention aims to improve the quality of printed products that can be produced by the printing machine, and this with simple means.
• the subject of the invention is a transport cylinder of the type indicated, characterized in that it comprises a covering element disposed on the cylindrical surface of the base body, the covering element having a plurality of through-holes. aligned with at least a portion of the openings, the cover member having an outer cover surface, the outer cover surface being made of a second material different from the first material, and in that the outer cover surface has a surface energy less than the surface energy of the first material.
• the transport cylinder has one or more of the following features:
• the outer covering surface is made of a material repelling the ink;
• the second material comprises, and preferably consists of, polytetrafluoroethylene or silicone;
• the through holes are rounded at their junction to the outer cover surface;
• the through holes have, in the unsolicited state of the cover member, a diameter less than a diameter of the openings;
• the covering element comprises a first axial section provided with holes and a second solid axial section, devoid of holes, and the second solid axial section covers an axial part of the base body provided with openings; and - the cover member is a cylindrical sleeve and the outer cover surface is a surface of the sleeve.
• the invention further relates to an assembly comprising a transport cylinder as defined above, the covering element having a first thickness, and the assembly comprising an exchange cover element, the covering element. exchange having a second thickness, different from the first thickness.
• the invention further relates to a device for transporting a flat product, of the type comprising:
• a transport cylinder for the flat product; a vacuum device adapted to create a vacuum; wherein the transport cylinder is a cylinder as defined above, and at least a portion of the plurality of openings is connected to the vacuum device.
• the transport device is a cutter of a sheet web, it comprises a cutting cylinder, and the transport cylinder is a counter-pressure cylinder of the cutting cylinder.
• the invention also relates to a printing press, comprising a printing unit adapted to print on a paper web, and a transport device of the aforementioned type.
• the invention also relates to a use of a transport cylinder of the aforementioned type, comprising the following successive steps:
• the invention also relates to the use of an assembly of the aforementioned type, comprising the following successive steps:
• FIG. 1 is a schematic side view of a printing machine according to the invention.
• FIG. 2 is a view corresponding to the view of FIG. 1 of a variant of a printing machine according to the invention
• Figure 3 is a schematic view of the cutting device and stacking of the press of Figures 1 and 2;
• FIG. 4 is an axial sectional view of the counterpressure cylinder.
• FIG. 5 is an enlarged view of the detail V of FIG. 4.
• FIG. 1 shows a rotary printing machine according to the invention, designated by the general reference 2.
• the printing machine 2 comprises a unwinder 4, four printing units 6, a traction device 8 and a cutting and stacking device 10.
• the printing machine 2 further comprises a tape gripper 14 and a dusting device 16.
• the printing machine 2 could comprise any number of printing units 6, in theory, from one to n.
• the unwinder 4 is adapted to unwind a continuous print tape 18.
• the print tape 18 is a coated paper web.
• Coated paper is a paper that includes a coating layer, for example of kaolin or chalk, improving the mechanical or optical properties of the paper. This paper makes it possible to obtain a printed product of high quality.
• the tape to be printed is an uncoated paper tape.
• the printing machine 2 defines a print path of the web 18 between the unwinder 4, through the printing units 6, the web gripper 14, the dusting device 16, and the pulling device 8 , to the cutting and stacking device 10.
• Each printing unit 6 comprises an inking device 20 which is provided with an ink tank 22 comprising ink 24 intended for printing on a strip of ink. paper 18.
• the ink 24 used in the context of the invention will be explained below.
• Each ink device 20 further comprises an ink transfer roller 26 for transferring ink 24 to printing rollers 28 (see below).
• the printing units 6 comprise these printing rollers 28 which are adapted to print on the paper web 18.
• the cutting and stacking device 10 is adapted to cut the print tape 18 into individual sheets 30 and to produce a stack of cut individual sheets.
• the traction device 8 is situated downstream of the printing unit 6 furthest upstream and upstream of the cutting and stacking device 10. This traction device 8 is adapted to apply a determined mechanical tension on the strip 18 exiting the printing unit 6 further downstream.
• the printing machine 2 is adapted to transport the printed web 18 in free suspension and in ambient air all the way between the printing unit 6 furthest downstream and the traction device 8, possibly with the exception of the tape gripper 14 and the powdering device 16.
• the printing machine 2 is also adapted to transport the printed tape 18 to the ambient air over the entire path between the traction device 8 and the cutting and stacking device 10.
• the printing machine 2 of Figure 1 does not have a dryer and has a small footprint.
• the printing machine 2 according to the variant shown in FIG. 2 differs from the printing machine 2 shown in FIG. 1 by the fact that between the belt gripper 14 and the traction device 8 is arranged a dryer 32 with infrared rays through which the printed band 18 is conducted.
• the infrared ray dryer 32 can be replaced by another device of drying by heating the strip, such as a hot air dryer.
• the dryer 32 has reduced dimensions compared with the prior art driers.
• the tape gripper 14 is adapted to detect a break in the paper web 18 and to grip the free end of the paper web 18 in this case.
• the tape gripper 14 has appropriate gripping elements 34.
• the tape gripper 14 is omitted.
• the powdering device 16 is adapted to deposit anti-staining powder on each of the faces of the printed strip 18. It can deposit anti-staining powder on one or both sides of the printed strip 18.
• the powdering device 16 comprises a reservoir 36 containing powder 38 and a dusting head 40 connected to the powder reservoir 36 via a pipe 42, for each of the faces of the paper web 18.
• the powdering device 16 is adapted to apply the anti-maculante powder to the paper web 18 continuously, preferably continuously continuously over a length which corresponds to at least twice the printing length.
• the powder 38 used for the powdering of the strip is preferably a vegetable powder, for example, corn-based, or a mineral powder.
• the traction device 8 associated with the other units of the press, makes it possible to print a strip of paper and to receive it in the cutting and stacking device 10, without drying this strip of paper 12 and by evaporation of the solvents of ink.
• the image is printed by the ink 24 contained in the ink tank 22.
• the ink 24 is a secative ink, or a waterless ink, or a two-component ink.
• the drying of the secant inks is the combination of a first phenomenon called “penetration into the support” and a second phenomenon called "the oxidation polymerization of varnishes consisting of oils and resins".
• the waterless inks are used with specific printing plates to define non-printing areas without using the conventional lithographic process based on the rejection of the greasy ink by a previously moistened hydrophilic surface.
• the use of these inks can be considered in the same way as the secret inks conventional and can be dispensed with a dryer, or design less cumbersome.
• Heat-set inks dry by evaporation of the mineral solvents mixed with the resin.
• the UV inks dry by polymerization of the resin under the effect of ultraviolet radiation.
• FIG. 3 diagrammatically shows the cutting and stacking device 10.
• the cutting and stacking device 10 comprises two input rollers 50, a cutting cylinder 52, a back pressure cylinder 54, a transfer roller 56, and a braking roller 58.
• the cutting and stacking device 10 comprises a fixed structure S or frame.
• the cutting device 10 delimits a path T of the paper web 18 and sheets 30 extending from the inlet of this device successively on the input rollers 50, the counter-pressure cylinder 54, the transfer roller 56, the brake roller 58 to a stack 31 of individual sheets 30.
• the inlet rollers 50 are arranged on the path T upstream of the cutting cylinder 52 and the backpressure cylinder 54.
• the two input rollers 50 are rotatable about an axis A and B with respect to the fixed structure S.
• Each of the input rollers 50 has a casing 60 having through holes 62.
• the cutting cylinder 52 is rotated about an axis C and comprises a blade 66.
• the blade 66 cooperates with counter-pressure blocks 68 arranged on the back-pressure cylinder 54.
• the back-pressure cylinder 54 comprises a cylindrical basic body
• the base body 70 is a hollow circular section cylinder and defines an outer cylindrical surface 74 and an inner cylindrical surface 76 of the base body.
• the base body 70 is made of a first material, preferably hard, such as steel or ceramic. This first material has a given surface energy.
• the counter-pressure cylinder 54 has a flange 78 to which the base body 70 is attached (see Figure 4). This flange 78 is housed in a bearing 80. Thus, the base body 70, the sleeve 72 and the flange 78 are rotatable relative to the frame S about an axis of rotation D.
• the base body 70 has through recesses 82 extending from the inner surface 76 to the outer surface 74 and opening out onto this outer surface 74.
• these recesses 82 are through holes, extending radially through relative to the axis D.
• the recesses 82 have a diameter D1.
• the base body 70 has a first axial portion 84 provided with the recesses 82 and at least one second axial portion 86 without recesses 82.
• the second axial portion 86 has a solid wall.
• the first axial portion 84 is located at the axial center of the base body 70 and the base body 70 has two axial second portions 86 located on either side of the first axial portion 84.
• the sleeve 72 is cylindrical and has an outer cylindrical surface 88 and an inner cylindrical surface 90 of the sleeve.
• the sleeve is disposed on the outer surface 74 of the base body 70.
• the sleeve 72 has a plurality of through holes 92 extending from the outer surface 88 to the inner surface 90.
• a multitude of these holes 92 is aligned each time with one of the recesses 82.
• each of the holes 92 is aligned with one of the recesses 82.
• the holes 92 have, in the unsolicited state of the sleeve 72, that is, when the recesses 82 are subjected to ambient pressure, a second diameter D2, which is smaller than the first diameter D1 of the recesses.
• the sleeve 72 is made of a second material, which has a surface energy lower than the surface energy of the first material of the base body 70 and which rejects the ink used to print on the strip 18. Also, the material the sleeve 72 is softer than the base body material 70. Preferably, the sleeve 72 comprises, or consists of, polytetrafluoroethylene
• the sleeve 72 has a thickness DM.
• the sleeve 72 comprises a first axial portion 100 provided with holes 92.
• the sleeve 72 also comprises at least one second axial portion 102 without holes 92 and comprising a solid wall all around its circumference.
• the sleeve 72 comprises two second axial sections 102 located on either side of the first axial section 100.
• Each second axial portion 102 is disposed on the first axial portion
• the second axial sections 102 cover the recesses 82 over the entire axial width which is not covered by the strip 18 or by a sheet 30.
• the first section 100 has an axial length [which is identical to the width L of the paper web 18 minus the lateral register R.
• the sleeve 72 makes it possible to adapt the counter-cut cylinder 54 to the width L of the paper strip 18.
• the counter-cut cylinder 54 also has a cylindrical inner wall 110 and two seals 112 attached to the structure S.
• the wall 110, the seals 1 12 and the base body 70 delimit a vacuum chamber 1 14 exclusively connected over a portion of the circumference to the recesses 82.
• the vacuum chamber 114 extends over an angle ⁇ , which is identical to the contact angle of the paper web 18 on the cylinder 54.
• the angle ⁇ is for example between 90 ° and 180 ° and is in any case less than 360 °.
• the countercut cylinder 54 also delimits an ambient chamber 116, which is subjected to ambient pressure.
• the ambient chamber 116 extends over an angle ⁇ about the axis D, ⁇ being 360 ° - ⁇ .
• the cutting device 10 also comprises a vacuum device 120 connected to the vacuum chamber 114 and adapted to create a pressure in this chamber 114.
• the vacuum device 120 is also connected to the input rollers 50 and the transfer rollers 56 and braking 58 to create a sub-pressure on a portion of the circumference of these rollers.
• the invention operates in the following manner.
• the vacuum device 120 creates an underpressure in the vacuum chamber 114. Under the effect of the pressure difference between the vacuum chamber 1 14 and In the environment, the parts of the sleeve 72 surrounding the holes 92 are sucked into the recesses 82 (see FIG. 5) and are elastically deformed. This is made possible by the flexibility of the sleeve 72.
• the tape 18 is printed by the printing units 6 and is fed into the cutting device 10.
• the paper web 18 is fed through the input rollers 50 to the cutting cylinder 52 and against the back pressure 54.
• the paper web 18 is cut by the sheet blade 66.
• the portion of the paper surrounding the counter-pressure cylinder 54 is sucked through the openings 82 and the holes 92 and holds the paper on the sleeve outer surface 88.
• the cylinder according to the invention saves material and is economical in terms of maintenance.
• the aforementioned features can be applied in a similar manner to the transport of a flat substrate, which is not paper.
• the base body 70 is not covered with a closed sleeve 72, but with another covering element, such as one or more flat plates. Apart from the different shape, these flat strips have the same characteristics as the aforementioned sleeve 72. The flat strips are glued to the base body 70.
• sleeves can be used to adjust the tension exerted on the paper web 18.
• the sleeve 72 having the thickness DM is changed against an exchange sleeve having a thickness different from the thickness DM.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Printing Methods (AREA)
• Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

Family

ID=40278935

Family Applications (1)

Country Status (6)

Families Citing this family (8)

Citations (6)

Family Cites Families (17)

• 2008
  • 2008-04-30 FR FR0852920A patent/FR2930767B1/fr not_active Expired - Fee Related
• 2009
  • 2009-04-16 EP EP09745952.3A patent/EP2271567B1/fr active Active
  • 2009-04-16 US US12/736,698 patent/US20110100239A1/en not_active Abandoned
  • 2009-04-16 WO PCT/FR2009/050709 patent/WO2009138633A2/fr active Application Filing
  • 2009-04-16 CN CN200980122528.3A patent/CN102083626B/zh not_active Expired - Fee Related
  • 2009-04-16 JP JP2011506749A patent/JP2011520723A/ja active Pending

Patent Citations (6)

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