EP0788879B1 - Machine d'impression rotative - Google Patents

Machine d'impression rotative Download PDF

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Publication number
EP0788879B1
EP0788879B1 EP97101657A EP97101657A EP0788879B1 EP 0788879 B1 EP0788879 B1 EP 0788879B1 EP 97101657 A EP97101657 A EP 97101657A EP 97101657 A EP97101657 A EP 97101657A EP 0788879 B1 EP0788879 B1 EP 0788879B1
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EP
European Patent Office
Prior art keywords
station
shaft
cylinder
motor
error
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.)
Expired - Lifetime
Application number
EP97101657A
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German (de)
English (en)
French (fr)
Other versions
EP0788879A1 (fr
Inventor
José Branas
Daniel Rota
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.)
Bobst Mex SA
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Bobst SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary 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
    • B41F13/008—Mechanical features of drives, e.g. gears, clutches
    • 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
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/70—Driving devices associated with particular installations or situations
    • B41P2213/73—Driving devices for multicolour presses
    • B41P2213/734—Driving devices for multicolour presses each printing unit being driven by its own electric motor, i.e. electric shaft

Definitions

  • the present invention relates to a printing machine rotary of strip or plate elements, and more particularly to a full color printing machine with multiple stations of basic colors, these prints overlapping to give the final image.
  • Each station includes, among other things, a lower plate cylinder working jointly on the one hand with a ink cylinder and an underlying transfer cylinder and secondly with an upper support cylinder.
  • the document EP 352 483 describes a machine in which all the support cylinders are animated by angular gearboxes engaged with a first mechanical shaft driven by a first electric motor, and all the plate cylinders are animated from a second mechanical shaft driven by a second motor electric. These two motors are controlled by a central computer digital adapting the angular speed of the cylinder shaft plate holders in case their diameter does not correspond to that of support cylinders, which eliminates the need to change them.
  • the document FR 2 541 179 describes a machine for making folding boxes, from sheets of cardboard, in which a section between four printing groups is inserted between a section upstream introduction and delivery sections, notching, cutting, folding and then receiving downstream.
  • a DC motor M1 trains the lower and upper carriers of each group printer whose plate cylinders are driven individually by four M2-M5 DC motors.
  • the calibration of the location longitudinal between the printing units is achieved by acting electrically on the angular position of each of the motors M2 to M5.
  • the printing cylinder of each printing unit is arranged so can also be moved laterally to align them impressions of different groups. To do this, it is mounted on bearings allowing a lateral displacement of the cylinder under the action of the motors M105 to M108.
  • This machine includes a device for driving motors M1 to M5 consisting of a control group, comprising a setpoint generator circuit and a motor synchronization circuit; a computing group made up of a microcomputer with circuits inputs / outputs; a signal conditioning group comprising a organ of meaning discrimination and multiplication of impulses from pulse generators G1 to G5 from motors M1 to M5 as well a conditioning circuit for interphase and shaping of signals from the first and second groups; and a group of logic from command consisting of a logic circuit for selecting the drives and a logic circuit for selecting manual commands.
  • This device creates a shaft between the motors M2 to M5 electric synchronization of the printing units, by chocking on the master engine M1 of general drive sheets which receives electrical pulses from an encoder.
  • This device achieves in particular the verification of the agreement between the programmed values and the actual state of the machine's components; a pre-positioning of motors M1 to M5 when changing jobs or after rupture of the electric shaft connecting them; execution of corrections angles of motors M1 to M5, whether on command by push button or by sheet tracking control units, as well as execution lateral corrections by acting on engines M105 to M108; and an monitoring the proper functioning of the different engines.
  • a recent development described for example under the SYNAX name in the catalog of the engine manufacturer MANNESMANN REXROTH of September 1994, consists of use asynchronous electric motors with "vector” control including electronic position control and servo circuits angular of the motor are connected by a transmission loop to a central electronic computation station synchronization, this central unit sending to each control circuit a value of "leaking" position setpoint, that is to say evolving with the desired speed of the machine.
  • a first interest of asynchronous motors is that they are cheaper to buy and maintain because their rotors don't that large turns short-circuited on themselves.
  • stator the supply of the stator is carried out by means of a voltage inverter by acting on the frequency and on the amplitude of the stator voltage.
  • phase control is performed of the stator voltage with respect to the rotor flux, which makes it possible to obtain faster response.
  • the position setpoints are usefully transmitted from the data center to the control circuits digitally along of an optical fiber loop, this transfer being particularly insensitive electromagnetic disturbances present in the workshops.
  • angular encoders intended to be mounted at the end of the rotary axis and generating an output signal sinusoidal whose interpolation makes it possible to determine the angular position of the axis to 1/2000000 of a millimeter. So the regulation carried out by a control circuit whose feedback loop receives the signal from such a encoder ensures synchronization accuracy of less than 0.005 angular degrees, which, for a plate cylinder of diameter usual of the order of 800 millimeters, corresponds to a peripheral error of 0.07 of a millimeter, i.e. well below the error of positioning of 0.10 millimeter usually tolerated in printing.
  • the document EP 401 656 describes, for example, a device for the drive and the adjustment of a plate cylinder and its cylinder which device is located on one side of the machine.
  • the drive torque of the cylinders is transmitted by three gear wheels in series with helical teeth.
  • the second gear is free rotationally mounted on the axis of the plate cylinder via of a landing.
  • a double gear wheel present, next to the first wheel toothed with helical teeth, a toothed crown with straight teeth which meshes on a gear wheel with straight teeth also mounted rigidly on the axis of the plate cylinder.
  • Peripheral identification is carried out by moving the double toothed wheel parallel to the axis, so the first helical wheel relative to the second, which moves forwards or backwards the peripheral position of the plate cylinder relative to the cylinder support.
  • the document EP 699 524 which belongs to the state of the art as defined in Article 54 (3) EPC, relates to a printing machine offset whose printing cylinder is directly driven by a motor electric controlled by a central unit synchronizing the stations between them by controlling and controlling the angular position of each axis of plate cylinder. A device reading printed mark marks by each station, establishes the lateral and longitudinal register error for each station.
  • the document EP 693 374 describes a control system electric particularly suitable for rotary printing machines notably equipped with an angle encoder generating a representative signal the angular position of each of the axes of the motors coupled to printing cylinders.
  • EP 644 048 relates to the annexation of cylinders blanket holder and printing cylinders of a printing machine in one single group of cylinders and one damper control circumferential of said cylinders.
  • Document US 4,484,522 discloses an automated system adjustment of the register, by detection of reference marks, for a color printing machine having optical units controllable by computer for controlling the lateral and longitudinal register.
  • the printing cylinders are automatically adjusted one with respect to the other before each start of printing.
  • Document US 3,742,850 relates to a mechanism for adjusting the lateral and longitudinal register in a machine which, on the one hand, changes the angular relationship between the drive shaft and the printing roller, and on the other hand allows transversely move the position of the latter.
  • document US 4,414,898 proposes a way of achieving a printing cylinder which is laterally adjustable in its bearings and describes in particular are fixing system where the axis of the motor is held by a removable bearing, and the plate cylinder is fixed on this axis by clamping its two end hubs between a first fixed cone and a second removable cone capable of being pushed towards the first by mechanical means.
  • the object of the present invention is a printing machine based on vector asynchronous direct drive motors plate cylinders, and if desired also support cylinders, this machine additionally comprising manual double correction means or automatic longitudinal and lateral registers of stereotypes excluding any reduction mechanism inserted between a motor and its cylinder plate holders.
  • Figure 1 is schematically illustrated an element in strip 4, such as a strip of paper or cardboard, passing successively in three printing stations 1, 2 and 3 comprising each a plate cylinder 16 facing a support cylinder 14 working like a rolling mill.
  • these stations successively deposit a square, circular then cross print designed to overlap exactly.
  • all the axes 24 of the support cylinders 14 are mechanically connected to the same drive shaft 54 moving the machine upstream and downstream along its printing stations.
  • the coupling of these axes 24 of support cylinders is carried out by means of bevel gears 34 with bevel gears.
  • This tree 54 is driven by an electric motor 110 controlled by a first electronic circuit of control and servo of the angular position 100.
  • the position angular a0 of the shaft 54, reflecting the advance of the strip 4 is read by a encoder 64 whose electrical signal representative of this angular position is applied in the feedback loop of circuit 100.
  • the plate cylinder 16 of each of the stations 1, 2 and 3 is directly mounted on an output shaft 65 of a motor electric, i.e. the rotor 26 of this motor is built on the very end of this axis, while the stator 36 is integral with the chassis of the machine.
  • the diameter of this axis 65 is relatively wide, of the order of 50 to 80mm, to transmit significant torques without elastic tension, but it is also hollow in the middle to decrease its moment of inertia.
  • These motors are preferably current asynchronous AC controlled by an electronic control circuit and angular position control 101, 102 and 103 respectively for each station.
  • control circuits and 100-103 servo are connected by a loop network to a unit central computer 10.
  • This unit includes a keyboard for input of data and instructions, a microprocessor, a plurality of memories containing management programs and data according to machine characteristics, as well as a display screen for parameters entered and / or data applied as output on the loop.
  • this transmission loop consists of a fiber cable coaxial optics, a first strand connecting the output of the central unit 10 to the control circuit 100 of the drive motor of all of the support cylinders, a second strand connecting circuit 100 to circuit 101 of motor control of the first station, a third strand connecting the circuit 101 to the 102 engine control circuit of the second station, a fourth strand connecting the circuit 102 to the control circuit 103 of the motor the third station and, finally, a fifth strand ensuring the closure back to the central computer unit 10.
  • an angular encoder 56 delivers a signal a 1, a 2 and a 3 representative of the instantaneous angular position of the corresponding rotor 26, therefore of the plate cylinder as soon as it is admitted that the axis 65 is sufficiently rigid by its dimensions.
  • the signal generated by this encoder 56 is applied in the feedback loop of the electronic control circuit and corresponding servo 101, 102 and 103.
  • This circuit includes first a first subset of servo of the couple G comprising a circuit Ki generating the stator electrical energy Is1, Us1 and f1, as well as a feedback feedback loop, either of the intensity by phases either of the flow for establishment of a possible error of correction.
  • Ki torque control circuits for motors asynchronous are known.
  • US-3,824,437 describes a circuit in which the magnetic field in its air gap is measured and the stator current we transform the measured stator current into two stator current components in quadratures oriented with respect to measured magnetic field one of the current components is regulated stator in quadrature proportional to the flow amplitude setpoint total rotor head at a constant level fixed by a quantity of reference to the constant input corresponding to the setpoint amplitude of the total effective rotor flow and the other current component is varied stator in quadrature with a second reference quantity or command applied to the input and proportional to the setpoint torque of the asynchronous motor.
  • Another method of controlling an engine asynchronous described in the document SU-193 604 consists in regulating phase by phase the instantaneous phase currents of the stator of a motor asynchronous by comparing setpoints and current measurements stator phase snapshots, to vary the stator current with the sum in quadrature of two components of stator current, of which one is constant and corresponds to the constant magnetic flux to be reached, the other being variable according to a control quantity corresponding to the setpoint torque of the asynchronous motor. Simultaneously, the frequency of the stator current is varied with the sum of two frequencies, one of which is that of rotation of the rotor, the other being subject to variation of the setpoint torque.
  • the control and servo circuit 101 further comprises a speed control loop based on the signal PL1 (a) from of the angular encoder 56, this signal being derived over time in the loop feedback to get effective speed information which is compared to the setpoint for establishing the possible error, then speed control in the kV circuit put in series with the circuit torque control Ki.
  • the information pL1 (a) from the encoder 56 is also compared to the setpoint signal pL1 (t) received from the fiber optic transmission loop for establishing a possible position error, then control in position in the circuit Kp connected in series with the speed control circuit Kv. So the angular position of the motor output axis 65 almost reflects the setpoint applied at input.
  • the axis 65 is mounted to rotate freely in bearings at rollers or needles 40, 40 'and 40' 'also allowing movement axial when desired, this axial movement taking on the one hand the rotor 26 and on the other hand the plate cylinder 16. More precisely, these bearings are in contact with the axis 65 through friction rings 42.
  • the first bearing 40 is installed in a base 32 located at the rear of the stator 36 of the engine and fixed to the chassis 37 of the machine by the casing 33 of the electric motor.
  • the second bearing 40 ' is located between the electric motor and the plate cylinder 16, more precisely installed in a crown 38 integral with the chassis 37.
  • the third bearing 40 '' is, for its part, installed at the other end of the axis 65 and of the cylinder 16 within a block 80 of the chassis likely to be moved back for clearance.
  • the flange 45 is composed of two bearings crimped on axis 65 and pushed against a shoulder 44 of this axis by a nut 43 engaged with an external thread of the axis, this thrust being made through a spacer 41 leaving free access to the fork 55.
  • the fork 55 is itself mounted through a ball bearing 53 along a support pin 58 mounted in the chassis 37 parallel to the axis 65.
  • This fork is brought in axial translation by a carriage 52 in two parts and in engagement with a double worm screw 30. Adjustment of the tightening of these two carriage parts 52 makes it possible to annihilate any residual play.
  • the end of the worm 30 carries a pulley 29 driven by a toothed belt 28 in taken with the output pinion 27 of a stepping motor 25 mounted rigidly on an upper flange 39 of the chassis 37.
  • this assembly can be done very rigidly.
  • the precision of the displacement of the fork 55, therefore of the axis 65, is obtained on the one hand by the pitch of the micrometric screw 30 and on the other hand by the diameter ratio of the pulley 29 and the pinion 27.
  • the angular encoder 56 is mounted at the rear of the motor at the end of the axis 65. More particularly, the attachment 46 of the encoder housing to the fixed base 32 is such that it allows a axial displacement of this case to always remain in correspondence exact with its internal rotary mechanism 57 which is integral with the axis 65, but is such that it rigidly maintains this housing in a position fixed and precise angular with respect to this base 32.
  • this fastener 46 is composed of a plurality of slats in the form of concentric crowns 47 attached to each other in pairs diametral of fasteners 48, a pair between two strips being offset at right angle to the next pair. These slats being thin, they are flexible in the axial direction. However, the crown shape of these slats prevents any rotation relative to the central axis.
  • This encoder 56 is protected by a cover 31 fixed to the base 32.
  • the printing machine further comprises a device for locating marks printed at the edge of the strip by each of the stations, this identification making it possible to establish any errors longitudinal and lateral register of one or other of the prints.
  • the marks 5 pass under a head optical reading 21 focusing a beam of light sent by a first part of a bundle of optical fibers 23.
  • the reflected light is read by the read head 21 and driven by the second part of the fiber optics 23 to photosensitive elements 20 whose signals generated electrics are applied to a register control unit 22.
  • This control unit 22 includes a processing circuit 220 of conditioning and selection of the signals which it directs either towards a circuit for calculating the longitudinal error 222, i.e. towards a circuit for calculating lateral error 224.
  • Circuit 222 includes three output lines allowing to apply a signal representative of the longitudinal error dL1 to the control and servo circuit 101 of the first station and, from analogously, to apply the signals representative of an error of register dL2 and dL3 to the control and servo circuits 102 and 103 corresponding stations.
  • the error calculation circuit side 224 includes, among other things, three outlets for applying a signal representative of the side register error dl1 at the preamplification and control 15 of the engine 25 of the first station and, in parallel, signals dl2 and dl3 representative of lateral errors at control circuits of the lateral correction motors 25 of stations 2 and 3 respectively.
  • the correction signal dl (i) correspondent triggers the rotation, in one direction or the other, of the motor 25 concerned which moves the fork 55 forwards or backwards so the axis 65 with its plate cylinder, and thereby corrects the lateral position of the plate at fault.
  • the lateral error correction range is usually +/- 5mm.
  • a rather slender asynchronous motor for example active parts with a length of the order of 500 mm
  • the rotor offset from stator due to lateral correction remains less than 1% of their total length, which only results in very slight disruptions to flows which are quickly caught up by the electronic control and servo circuit 10 (i).
  • this displacement due to lateral register correction had no influence on the reading accuracy of the angle encoder 56 thanks to its 46 special attachment, allowing continued operation correct asynchronous motor control and servo circuit vector.
  • the longitudinal error signal dL1 is directly added in the addition of the setpoint signal pL1 (t) and the pL1 (a) feedback at the input of the control and servo circuit 101.
  • This locating error dL1 is then simply and spontaneously treated as if it were in fact only an error detected by the feedback.
  • the asynchronous motor accelerates (or slows down) slightly during one revolution to re-align with respect to the advance of the strip 4 as imposed by the rotation of the counter cylinders 14. A new registration mark is then read by the read head 21. If the circuit 22 finds a residual error, it reapplies a lower adjustment correction dL1 'for the lap next.
  • the plate cylinder 16 in fact comprises a rigid and light cylindrical shell, for example made of aluminum, at the ends of which are fixed, by welding or other means, two hubs 74 having a concave conical central cavity oriented towards outside.
  • the axis 65 is then completed by a first cone 70 having a fixed position.
  • this first cone 70 is supported on the ring 42 emerging from the second 40 'roller bearing.
  • the end of the axis opposite to the motor then comprises a first part of restricted diameter taken in the 40 "bearing, the next part then having an external thread on which can be engaged a nut 43 allowing to push forward a second movable cone 72.
  • a change of plate cylinder takes place simply by releasing the bearing 40 '' from the axis by removing the movable block 80 and tilting. We can then unscrew the nut 43, which frees the second movable cone 72 therefore the cylinder 16 which can be removed. We notice then that the presence of axis 65 remained permanently allows to guide the new cylinder on which it is threaded. Movable cone 72 is reinstalled and then pushed forward by rotation of the nut 44. The hubs 74 are thus tightened between the two cones 70 and 72, which achieves a rigid fixing and without play. The 40 '' bearing is finally replaced in advance of the block 80. In particular, these cylinders being lighter than before, they are of a manipulation faster and more precise. We can even consider automating such a change by means of a robot.
  • a sleeve is usually fitted on the plate cylinder made of expanded material having a certain internal radial elasticity and on the hard peripheral envelope from which the collage photos.
  • a flexible tube 67 protected by the cover 31, connects an external connection socket 68 of compressed air with the internal channel 66 of the axis.
  • this channel 66 leads to one or more radial openings 76 diffusing the compressed air inside the cylinder plate holder 18.
  • the end hub may then include one or more several internal channels 75 for diffusing the compressed air under the sleeve 19.
  • this sleeve expands radially, thereby increasing its internal diameter, which annihilates any friction force. It is thus possible to use a range of sleeves having thicknesses between 2.5mm and 66.2mm used alone or in overlay.
  • the reference 17 designates a plate cylinder of diameter particularly important and on which are directly stuck pictures, this configuration being useful in countries where the supply of sleeves flexible is deficient.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP97101657A 1996-02-09 1997-02-04 Machine d'impression rotative Expired - Lifetime EP0788879B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH334/96 1996-02-09
CH00334/96A CH691225A8 (fr) 1996-02-09 1996-02-09 Machine d'impression rotative.
CH33496 1996-02-09

Publications (2)

Publication Number Publication Date
EP0788879A1 EP0788879A1 (fr) 1997-08-13
EP0788879B1 true EP0788879B1 (fr) 2000-03-22

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ID=4184654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101657A Expired - Lifetime EP0788879B1 (fr) 1996-02-09 1997-02-04 Machine d'impression rotative

Country Status (11)

Country Link
US (1) US5771805A (zh)
EP (1) EP0788879B1 (zh)
JP (1) JP2866071B2 (zh)
KR (1) KR100220262B1 (zh)
CN (1) CN1079049C (zh)
AU (1) AU712423B2 (zh)
BR (1) BR9700918A (zh)
CA (1) CA2197036C (zh)
CH (1) CH691225A8 (zh)
DE (1) DE69701481T2 (zh)
TW (1) TW425351B (zh)

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CN113965108B (zh) * 2021-11-19 2023-07-25 江苏科技大学 一种水下机器人多电机协同推进***及控制方法

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CH691225A8 (fr) 2001-08-15
BR9700918A (pt) 1998-09-01
US5771805A (en) 1998-06-30
KR100220262B1 (ko) 1999-09-15
CH691225A5 (fr) 2001-05-31
CA2197036C (en) 2001-02-27
CN1159982A (zh) 1997-09-24
AU712423B2 (en) 1999-11-04
AU1254897A (en) 1997-08-14
DE69701481D1 (de) 2000-04-27
JPH09216348A (ja) 1997-08-19
JP2866071B2 (ja) 1999-03-08
KR970061518A (ko) 1997-09-12
CA2197036A1 (en) 1997-08-10
EP0788879A1 (fr) 1997-08-13
TW425351B (en) 2001-03-11
DE69701481T2 (de) 2000-08-10
CN1079049C (zh) 2002-02-13

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