EP0850764A2 - Mehrfarbenflexodruckmaschine mit einer automatischen Abszelleinrichtung - Google Patents

Mehrfarbenflexodruckmaschine mit einer automatischen Abszelleinrichtung Download PDF

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Publication number
EP0850764A2
EP0850764A2 EP97122661A EP97122661A EP0850764A2 EP 0850764 A2 EP0850764 A2 EP 0850764A2 EP 97122661 A EP97122661 A EP 97122661A EP 97122661 A EP97122661 A EP 97122661A EP 0850764 A2 EP0850764 A2 EP 0850764A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
ball screw
shaft
flexographic printing
supports
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.)
Withdrawn
Application number
EP97122661A
Other languages
English (en)
French (fr)
Other versions
EP0850764A3 (de
Inventor
Sergio Donghi
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.)
Rotomec SpA
Original Assignee
Maf SpA
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 Maf SpA filed Critical Maf SpA
Publication of EP0850764A2 publication Critical patent/EP0850764A2/de
Publication of EP0850764A3 publication Critical patent/EP0850764A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • 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
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/26—Arrangement of cylinder bearings
    • B41F13/30—Bearings mounted on sliding supports

Definitions

  • the present invention relates to a multi coloured flexographic printing machine either of drum or stack-type having an automatic printing cut-out device.
  • multi-colored flexographic printing machines require a device for printing cut-out for each colour group.
  • a moving unit comprising at least one block-holding cylinder and one screen cylinder in each colour group and the offset cylinder or drum or backpressure cylinders in the case of stack-type flexographic printing machines.
  • a device in general comprises only one motor or two pairs of electric motors (one at each side of the machine), a train of gear wheels and a threaded shaft for transmitting motion from each motor to the block-holding and screen cylinders.
  • the main object of this invention is to provide an automatic device for the automatic printing cut-out in a flexographic printing machine which device is designed to ensure quick and precise execution of the printing cut-out and comprises a small number of components, thereby being competitive with respect to the traditional printing cut-out devices.
  • Another object of the present invention is to provide a printing cut-out device which is also suitable for performing micrometric adjustment before printing setting.
  • Another object of the present invention is that the said printing cut-out device is simple in structure and suitable for being applied also to existing flexographic printing machines.
  • a device for printing cut-out in multi-colour flexographic printing machines comprising at least one colour group compising a block-holding and screend cylinder or roller rotatably mounted on suitable supports which can be slidingly moved towards or away from the printing offset drum or a respective back-pressure roller cylinder, a control system for monitoring movements of the supports comprising an end transverse or cross shaft arranged at the head of its respective colour group, a reversible electric motor for the cross shaft, a helical gear at each side of the flexographic printing machine keyed on the said end cross shaft, at least one ball screw which is rigid in rotation with a respective helical gear to trasmit motion to a respective cylinder bearing support arranged on one side of the machine, lead-nut means on each ball srew for displacing the cylinder supports of the cilinders and reversable driving means for the said lead-nut means designed to cause a limited angular movement to the respective ball screw, thereby
  • said lead-nut means comprises both a linear actuator for causing printing cut-out and a low electric power motor for micrometric setting of the cylinders.
  • a flexographic colour printing machine either of offset drum or stack-type has two or more colour groups, generally indicated at 1, each of which comprises, as is known in the state of the art, a block-holding cylinder or roller and a screen cylinder or roller (not shown in the drawings) mounted for rotation on suitable supports (also not shown in the drawings and of any suitable type), which can slide on a couple of substantially radial brackets or guides 2 and 3, i.e. a guide on each side and more precisly one on the operator side and one on the rear side of the machine, so that they can be moved towards or away from the offset drum or a respective back pressure roller cylinder.
  • the cylinder bearing supports comprise a control system for their movements, which has a trasverse or cross end shaft 4 arranged at the head of the brackets 2 and 3, an electric reversible motor 5 for driving the end cross shaft 4, two helical gears 6 and 7 keyed on the end cross shaft 4 at each side of the flexographic printing machine and a couple of ball screws, 8,9 and 10,11 respectively(a couple for each side), which are rigid in rotation with a respective helical gear 6, 7 by means of a respective helical gear 8a-11a for motion transmission to a respective cylinder bearing support.
  • Each ball screw 8, 9 on both sides has a lead-nut group 12, which comprises a receiving case 13 arranged around a respective ball screw.
  • the receiving case 13 preferably comprises a portion 13a, which almost completely locates its respective ball screw and a closing portion 13b delimitating therin a receiving seat 14 ( Figures 3 and 4) for a helical screw 15 keyed by means of a key 16 on a shaft 17 extending trasversally to the ball screw, along which it may axially slide.
  • the shaft 17 is rotatably supported cantileverwise by a closing flange 18 for the seat 14, through which the shaft extends and projects outwards and it supports either a manual control handwheel 19 (Fig.3) or the output shaft of a reduction unit 20 controlled by an electric reversible low-power motor 21 (Fig.4).
  • a manual control handwheel 19 Fig.3
  • the output shaft of a reduction unit 20 controlled by an electric reversible low-power motor 21 (Fig.4).
  • a linear actuator e.g. a fluid operated cylinder, such as a pneumatic cylinder 24 disposed in axial allingment with the shaft 17.
  • the head 22 is fixed to an end of the helical screw 15, so that for each movement of the piston rod 23 the helical screw 15 must slide along the shaft 17, thereby causing a corresponding light movement in one direction or the other of the relative ball screw. Should instead, the shaft 17 be rotated by the handwheel 19 or by the motor 21, a microscopic movement forwards or backwards of its respective ball screw is caused.
  • Actuation of the fluid-operated cyilinder 24 or the motor 21 is performed by an electronic control unit (not shown in the drawings) of a kind usually provided in a flexographic printing machine.
  • the movement transmitted to the ball srews owing to the movement of the piston rod 23 can be advantagiously used for printing cutout in a simple, quick and precise way, e.g. by causing a rotation of a predetermined angle a , for example 48°, between the initial position x and the final position y (Figs. 5 and 6) of the respective ball screw.
  • a predetermined angle a for example 48°
  • Partial micrometric angular movement x-y due to the action of either the handwheel 19 or the motor 21 is suitably used for micrometric setting before starting or during the printing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Printing Methods (AREA)
  • Screen Printers (AREA)
EP97122661A 1996-12-23 1997-12-22 Mehrfarbenflexodruckmaschine mit einer automatischen Abszelleinrichtung Withdrawn EP0850764A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR960058U 1996-12-23
IT96VR000058 IT241327Y1 (it) 1996-12-27 1996-12-27 Macchina flessografica a piu' colori con dispositivo per lo stacco distampa automatico

Publications (2)

Publication Number Publication Date
EP0850764A2 true EP0850764A2 (de) 1998-07-01
EP0850764A3 EP0850764A3 (de) 1999-03-31

Family

ID=11428219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97122661A Withdrawn EP0850764A3 (de) 1996-12-23 1997-12-22 Mehrfarbenflexodruckmaschine mit einer automatischen Abszelleinrichtung

Country Status (4)

Country Link
EP (1) EP0850764A3 (de)
BR (1) BR9706287A (de)
CA (1) CA2225840A1 (de)
IT (1) IT241327Y1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199167A3 (de) * 2000-10-18 2003-02-26 Flavio Buffo Flexographisches Farbwerk mit zentraler Einstellung von Druckregister und Andruck
WO2004082940A1 (es) * 2003-03-17 2004-09-30 Comexi, Sa Rodillo de maquinaria para la impresión flexográfica con dispositivo de control de posición angular
CN108749357A (zh) * 2018-06-01 2018-11-06 苏州市东成办公科技有限公司 一种针式打印机自动切纸控制装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604350A (en) * 1969-04-23 1971-09-14 Lee Machinery Corp Flexographic presses with interrupter and cylinder register mechanisms
FR2319493A1 (fr) * 1975-07-31 1977-02-25 Holweg Ateliers Const Meca Dispositif pour le changement et le calage des cylindres de machine a imprimer
FR2527989A1 (fr) * 1982-06-04 1983-12-09 Holweg Atel Const Meca C A Procede et dispositif pour le prepositionnement des stations d'encrage d'une imprimeuse
DE4001735A1 (de) * 1990-01-22 1991-07-25 Windmoeller & Hoelscher Vorrichtung zum verfahren von wellen lagernden lagerboecken
DE4308711C2 (de) * 1993-03-18 1997-05-15 Windmoeller & Hoelscher Vorrichtung zum Verfahren von auf Schlitten befestigten und Wellen lagernden Lagerböcken

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199167A3 (de) * 2000-10-18 2003-02-26 Flavio Buffo Flexographisches Farbwerk mit zentraler Einstellung von Druckregister und Andruck
WO2004082940A1 (es) * 2003-03-17 2004-09-30 Comexi, Sa Rodillo de maquinaria para la impresión flexográfica con dispositivo de control de posición angular
CN108749357A (zh) * 2018-06-01 2018-11-06 苏州市东成办公科技有限公司 一种针式打印机自动切纸控制装置

Also Published As

Publication number Publication date
BR9706287A (pt) 1999-05-25
CA2225840A1 (en) 1998-06-27
IT241327Y1 (it) 2001-05-03
EP0850764A3 (de) 1999-03-31
ITVR960058U1 (it) 1998-06-27

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