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
  • 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
• • 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
  • B65H29/68—Reducing the speed of articles as they advance
  • B65H29/686—Pneumatic brakes
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2406/00—Means using fluid
  • B65H2406/30—Suction means
  • B65H2406/32—Suction belts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2406/00—Means using fluid
  • B65H2406/30—Suction means
  • B65H2406/33—Rotary suction means, e.g. roller, cylinder or drum
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2513/00—Dynamic entities; Timing aspects
  • B65H2513/10—Speed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2513/00—Dynamic entities; Timing aspects
  • B65H2513/20—Acceleration or deceleration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
  • B65H2557/20—Calculating means; Controlling methods
  • B65H2557/24—Calculating methods; Mathematic models
  • B65H2557/242—Calculating methods; Mathematic models involving a particular data profile or curve
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2801/00—Application field
  • B65H2801/03—Image reproduction devices
  • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

• Sheet conveying device Cutting device, printing press and use therefor
• the present invention relates to a sheet transport device, of the type comprising:
• a transfer device adapted to transfer a sheet
• a first device for conveying a sheet transferred from the transfer device to the conveying device :
• control means which are adapted to control the speed of the first conveying device and which defines a transfer cycle.
• These transport 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 printed sheet results in ink deposition on the transport surface, and results in poor production quality, particularly when the transport roll is a decelerating roll of the sheet.
• the present invention aims to improve the quality of printed products that can be produced by the printing machine, and this with simple means.
• control means are suitable for:
• the transport device comprises one or more of the following features: during a transfer cycle, the first conveying device and the transfer device have a transfer phase in which a sheet is transferred to the first conveying device and an output phase in which a sheet is deposited by the first conveying device, and the control means are adapted to accelerate the first conveying device between the output phase and the transfer phase and for braking the braking device between the transfer phase and the output phase;
• control means are adapted to drive the first conveying device at a constant speed during the transfer phase and during the output phase;
• control means are adapted to drive the transfer device during the transfer phase at a first transfer speed and the conveying device at a second transfer speed, different from the first transfer speed;
• the first transfer speed is greater than the second transfer speed; the first transfer speed is equal to the second transfer speed;
• control means are adapted to drive the transfer device at a constant speed during the whole of a transfer cycle
• the first conveying device is a braking device adapted to brake a sheet
• the first conveying device is a conveyor, in particular with a belt or with a chain;
• control means comprise means for detecting the position of a conveying element of the conveying device and means for generating a speed reference signal of the conveying device as a function of the raised position, in particular of the electronic cam means ;
• the transport device comprises a second conveying device, the transfer device being adapted to alternately transfer a sheet to each of the first and second conveying devices;
• the transport device comprises a cutting device adapted to cut a sheet strip and to feed the sheet transfer device; and
• the transfer cylinder is a counter pressure cylinder of the cutting device.
• the invention further relates to a sheet output device comprising: - a tape inlet;
• the invention also relates to an offset web rotary press comprising an output device of the aforementioned type.
• the invention also relates to a method of transporting sheets comprising the following steps during a transport cycle:
• the sheet transport method comprises one or more of the following features: during a transfer phase, transfer a sheet of the transfer device to the first conveyor device at a transfer speed ,
• the transport method comprises the step of driving the first conveying device at a constant transfer and / or output speed
• the transport method comprises the step of driving the transfer device at a first transfer speed and the first conveying device at a second transfer speed; the first transfer speed is greater than the second transfer speed;
• the method of transport comprises the step of cutting the sheet of a strip.
• FIG. 1 is a diagrammatic side view of a machine for printing 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
• FIG. 3 is a schematic view of the cutting device and stacking according to a first embodiment
• FIG. 4 and 5 are diagrams showing the operating speeds of the transfer device and of the conveying device according to a first and a second operating mode of the cutting device;
• FIG. 6 is a schematic view corresponding to the view of FIG. 3 of a second embodiment of the cutting and stacking device according to the invention.
• FIG. 7 is a diagram showing the operating speeds of the transfer device and conveying devices during operation of the cutting device according to the second embodiment.
• Figure 1 is shown 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 printing 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. Alternatively, it is possible that 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.
• the infra-red dryer 32 may be replaced by another strip-drying device, 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 strip 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 corn-based vegetable powder, 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 conventional secundant inks previously seen and can dispense 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 and a back pressure cylinder 54.
• the cutting and stacking device 10 comprises a fixed structure S or frame.
• the inlet rollers 50 are arranged upstream of the cutting cylinder 52 and the counter-pressure 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 inlet rollers 50 has a casing 60 having through holes 62.
• the cutting cylinder 52 has a blade 53 and is rotatable about an axis C 2.
• the backpressure cylinder 54 is rotatable about an axis D and has backpressure blocks 63 cooperating with the blade 53 to cut the sheet paper web 30.
• the cutting and stacking device 10 comprises a transfer device 64 and a conveyor device 66.
• the transfer device 64 is adapted to take a sheet 30 of the backpressure cylinder 54 and transfer it to the conveyor device 66.
• the transfer device 64 comprises a transfer cylinder 68 rotatable about an axis E.
• the transfer cylinder 68 has openings 70.
• the conveying device 66 comprises a conveying cylinder 72 rotatable about an axis R
• the conveying cylinder 72 comprises openings 74.
• the detent device 10 also includes a vacuum device 71 adapted to create a depression in the openings 70, 74.
• the cutting device 10 defines a path of the paper web 18 and sheets 30 extending from the inlet of this device 10 successively on the input rollers 50, the back pressure cylinder 54, the transfer cylinder 68, the conveying cylinder 72 to a stack 31 of individual sheets 30.
• the cutting device 10 comprises control means 76 adapted to control the speed V66 of the conveying device 66 and the speed V64 of the transfer device 64.
• the control means 76 define a transfer cycle of a sheet 30.
• a transfer cycle is for example a complete revolution of the transfer cylinder.
• the control means 76 are adapted to brake this conveyor device 66.
• the control means 76 are adapted to accelerate the conveying device 66.
• FIG. 4 shows a transfer cycle CT of the cutting device 10.
• the abscissa shows the time T on a transfer cycle, thus a rotation around 360 ° of the transfer cylinder 68.
• the ordinate shows the speed V64 of the transfer device 64 and the speed V66 of the conveying device 66.
• the transfer device 64 and the conveying device 66 have a transfer phase PT, in which a sheet 30 on the transfer cylinder 68 is transferred from the transfer device 64 to the device 66, and an exit phase PS in which the sheet 30 is deposited by the conveying device 66 on the stack 31.
• a deceleration phase PD extends from the conveying device 66.
• an acceleration phase PA of the conveying device 66 is also known as the transfer phase PT and before the transfer phase PT of same cycle.
• control means 76 are adapted to accelerate the conveying device 66 between the output phase PS and the transfer phase PT and to brake the conveyor device 66 between the transfer phase PT and the phase of transfer. PS output of the same cycle.
• the control means 76 are adapted to drive during the transfer phase PT and during the output phase PS the conveyor 66 at constant speed V66. During the PS output phase, the conveyor 66 is driven at an output speed VS.
• control means 76 are adapted to drive the transfer device 64 at a constant speed V64 over a whole transfer cycle.
• the speed V64 and the speed V66 are identical to a transfer speed VT.
• Figure 5 shows a variant of the transfer cycle.
• the control means 76 are adapted to drive, during the transfer phase PT, the transfer device 64 at a first transfer speed VT1 and the conveyor device 66 at a second transfer speed
• the speed V64 of the transfer device 64 is, over the whole of the same cycle, greater than the speed V66 of the conveying device 66.
• the first transfer speed is greater than the second transfer speed.
• the conveying device 66 is a braking device adapted to brake a sheet.
• the conveying cylinder is a brake cylinder.
• the control means 76 are preferably means ECAM technology, that is to say, electronic cam.
• the control means are therefore adapted to control the speed of each of the transfer devices 64 or conveyor 66 as a function of the position of the conveying element of this device.
• the conveying element is either a cylinder, for example the cylinder 68, or a belt or belt.
• the control means 76 are adapted to raise the angular position of the cylinder and to control the speed as a function of this position.
• the control means advantageously comprise a processor connected to a sensor of the position angular cylinder and a memory connected to the processor.
• the memory includes information for transforming the information of the angular position into information representing a speed estimate of the corresponding cylinder.
• the processor has means for transmitting the speed reference to a speed controller.
• Figure 6 is shown a schematic view of a second embodiment of the cutting and stacking device 10 according to the invention.
• This cutting and stacking device 10 comprises a cutting cylinder 52 and a back-pressure cylinder 54.
• the transfer device 64 comprises the counter-pressure cylinder 54, so that the transfer cylinder 68 is constituted by the counterpressure cylinder.
• the transport device comprises a first 66A and a second 66B conveying devices, each of which is a braking device.
• the counter-pressure cylinder 54 is therefore adapted to directly feed each of the first 66A and 66B second conveying devices.
• Each conveying device 66A, 66B comprises a conveying cylinder 72.
• Each cylinder 72 is provided with openings 74.
• Each of the first conveying device 66A and second conveying device 66B comprises an underpressure chamber extending over a first angular range ⁇ and a pressure chamber extending over a second angular range ⁇ .
• Each of the conveyor devices 66A, 66B comprises an ambient chamber extending over a third angular range ⁇ .
• Each of the chambers is connected to the openings 74 on the corresponding angular range.
• the control means 76 are adapted to control the speed of each of the conveyor devices 66A and 66B as well as that of the transfer device 64.
• the transfer device 64 is adapted to transfer a sheet 30 alternately on one 66A and the other 66B of the conveying devices.
• the transport device defines a transfer cycle which consists of the transfer of two successive sheets 30.
• Fig. 7 is a diagram showing the operating speeds of the transfer device 64 and the conveyor devices 66A, 66B during operation of the cutting device according to the second embodiment.
• the abscissa shows the time T on a CT transfer cycle.
• the ordinate shows the speed V64 of the transfer device 64, the speed V66A of the first conveyor 66A and the speed V66B of the second conveyor 66B.
• the first conveyor device 66A and the transfer device 64 have a transfer phase PT1 in which a sheet 30 is transferred from the transfer device 64 to the first conveyor device 66A and a PS1 output phase wherein a sheet 30 is deposited by the first conveyor 66A on the first stack 31 of sheets.
• the transfer phase PT1 and before the PS1 output phase of the same cycle extends a deceleration phase PD1.
• an acceleration phase PA1 of the first conveying device extends after the output phase PS1 and before the transfer phase PT1 of the same cycle.
• the acceleration phase PA1 is shorter than the deceleration phase PD1.
• the sheet 30 is braked with a relatively low deceleration, which limits the marking on the paper.
• the second conveying device 66B and the transfer device 64 have a transfer phase PT2 in which a sheet 30 is transferred from the transfer device 64 to the second conveyor 66B and a second phase.
• PS2 outlet in which a sheet 30 is deposited by the second conveyor device 66B on the second stack 31 sheets.
• the PT2 of the same cycle extends an acceleration phase PA2 of the second conveyor 66B.
• the acceleration phase PA2 is shorter than the deceleration phase PD2.
• the sheet 30 is braked with a relatively low deceleration, which limits the marking on the paper.
• feeding the two conveyor devices 66A, 66B also allows the sheets to be braked with low deceleration for a given sheet production speed.
• control means 76 are adapted to drive the conveying devices 66A, 66B with constant transfer speed VT and VS output.
• the conveying device 66, 66A, 66B is a conveyor, in particular a conveyor belt or chain.
• the conveying device does not comprise a cylinder.
• the term "speed" means the speed of the element in contact with the sheet 30.
• the speed is the circumferential speed of this transfer cylinder.
• the speed is the circumferential speed of this conveying cylinder.
• the transfer and / or conveying devices comprise conveyor belts
• the corresponding speed is the speed of the belt.
• a transfer cycle is the time elapsing between a given configuration of the transfer device and the conveying device.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
• Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
• Rotary Presses (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=40225603

Family Applications (1)

Country Status (6)

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Family Cites Families (7)

• 2008
  • 2008-04-30 FR FR0852926A patent/FR2930769B1/fr not_active Expired - Fee Related
• 2009
  • 2009-04-29 JP JP2011506760A patent/JP2011523600A/ja active Pending
  • 2009-04-29 WO PCT/FR2009/050795 patent/WO2009138698A2/fr not_active Ceased
  • 2009-04-29 US US12/990,614 patent/US8444131B2/en not_active Expired - Fee Related
  • 2009-04-29 CN CN200980122189.9A patent/CN102083726B/zh not_active Expired - Fee Related
  • 2009-04-29 EP EP09746017.4A patent/EP2285721B1/de not_active Not-in-force

Non-Patent Citations (1)

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