EP0309023A2 - Dispositif pour régler le pas d'une machine à avance par intermittence, en particulier des machines à imprimer du pochoir - Google Patents

Dispositif pour régler le pas d'une machine à avance par intermittence, en particulier des machines à imprimer du pochoir Download PDF

Info

Publication number
EP0309023A2
EP0309023A2 EP88201918A EP88201918A EP0309023A2 EP 0309023 A2 EP0309023 A2 EP 0309023A2 EP 88201918 A EP88201918 A EP 88201918A EP 88201918 A EP88201918 A EP 88201918A EP 0309023 A2 EP0309023 A2 EP 0309023A2
Authority
EP
European Patent Office
Prior art keywords
sensor
transducer
machine
sensors
printing
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Withdrawn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
EP88201918A
Other languages
German (de)
English (en)
Other versions
EP0309023A3 (fr
Inventor
Luigi Salvade
Giovanni Bonifacini
Angelo Goletti
Emanuele Christiani
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.)
OFFICINE MECCANICHE SALVADE' Sas
Original Assignee
OFFICINE MECCANICHE SALVADE' Sas
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 OFFICINE MECCANICHE SALVADE' Sas filed Critical OFFICINE MECCANICHE SALVADE' Sas
Publication of EP0309023A2 publication Critical patent/EP0309023A2/fr
Publication of EP0309023A3 publication Critical patent/EP0309023A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/10—Machines for multicolour 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
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/04—Conveying or guiding webs through presses or machines intermittently

Definitions

  • This invention relates to a device for the control and regulation of the intermittent forward motion of machine equipped with a closed loop conveyor belt or equivalent device, where the intermittent forward step must be extremely precise, particularly when the belt is very long, of the order of 80 m and more.
  • Magnetic transducers provided with position readers are also known, but these employ a rigid length scale of not more than about 3 metres and, therefore, while they are very useful when applied to machine tools, they have no practical application on long belts or equivalent devices (large diameter rotary tables etc.).
  • the present invention proposes a completely new system for the control of the intermittent forward motion which is extremely precise and reliable and has none of the negative features of the known systems.
  • the invention consists of the application of a non-rigid magnetic position transducer to one of the edges of the conveyor belt, specifically, of a band of special flexible thermoplastic material which can be magnetised, said band being magnetised with alternating polarity at constant intervals.
  • Two magnetic sensoring devices are mounted on the vertical axis of the band, a suitable distance apart, arranged one each side of the printing frame, or in a different position but always as close to the frame as possible, and are coupled to a step counting device, the step being constituted by the movement which has to be made, which in the case of the screen-printing machine corresponds to the exact nominal printing step.
  • One of the two sensors is mounted on a bar whose length can be adjusted to adapt the machine to the various printing steps, the distance corresponding to the nominal step being used at that moment.
  • the two sensors can communicate with one another, the first transmitting to the second the data it has monitored so that the second sensor can stop the belt in correspondance to the same lines of force recorded by the first sensor as the starting point, after a precise interval which corresponds to the exact distance between the two sensors.
  • each section of the belt corresponding to a printing step in the case of screen-printing machines constitutes a discrete element and thus any errors due to the conditions of one section of the belt are not added to those of sub-sequent sections, therefore, the system operates as if it were controlled by the known rigid magnetic transducer monitoring system which however cannot be adapted to machines which are more than 2-3 metres long, while the system of this invention can be applied to belts of any length required, 80 metres or more.
  • the aforesaid control unit made up of the magnetic transducer, the two sensors and the step counter, performs the function of reading and controlling the intermittent movement of the machine and is connected to another control and memory unit complete with man-machine interface of a basically known type.
  • this unit memorises the exact position of each of the prints made, reproducing these positions perfectly on the next run so that the subsequent colours are superimposed in a way which is practically perfect because of the extremely high precision of the monitoring system which is capable of sensing the exact position of a point, since it can read the intensity of the field between two poles of the same name and also the direction of the lines of force.
  • the automatic machine for screen-­printing on fabric 1 is basically constituted by a conveyor belt 2 stretched between the motor rollers 3 and 4 driven by two D.C. motors 5 and 6.
  • the fabric to be printed 7 is glued to this belt, indicated with the broken line in figure 1, thus for example an 80 m long machine can print pieces of fabric which are 160 m long.
  • a known type of drying oven 8 is mounted, heated for example by a battery of infrared lamps 9.
  • the automatic screen-printing device 10 is located on another section of the machine, preferably but not necessarily in the starting area. It is shown schematically in the drawings because its components are of a known type.
  • a magnetic transducer tape 11 is applied to the whole length of one of the edges of the belt 2, as can be seen in fig. 3.
  • This is constituted by a flexible tape of a suitable known magnetisable material, magnetised with alternating polarity according to an appropriate pre-set step P.
  • Two magnetic sensors are fixed to the structure of the machine and arranged in a position above the vertical axis of the transducer tape 11.
  • the first sensor 12 is in a fixed position and the second 13 is mounted so that it can slide on a rod 14 and thus can be moved in order to vary its distance from the first sensor 12 to adjust this distance to the various possible real printing steps Sr by means of a small motor 15.
  • the rod 14 is of a length appropriate to cover all the possible widths of the screen-printing screens which are commonly used.
  • a control unit and man-machine interface 16 of a basically known type is mounted, supplied with a keyboard and video screen, which memorises the data which are monitored and provides the commands to the working parts of the machine in accordance with the sequence of the operating cycle.
  • the screen-printing device is located immediately after the sensors 12 and 13 of the device which controls the forward step of the machine, but according to the invention it can also be located either before or between the two sensors 12 and13.
  • the device operates in the following way.
  • the precise distance between the two sensors 12 and 13 corresponding to the desired printing step Sr is defined - adjustable within a given range according to the design - and the machine is started up and the operating cycle commences with the following operations.
  • Sensor 13 receives the signal sent to it by the transducer which is in axis beneath it at that moment and transmits the information to sensor 12.
  • the control unit 16 gives consent for the forward movement of the belt and motors 5 and 6 come into action, moving the belt in the direction shown by the arrow.
  • sensor 12 intercepts exactly the same signal as the one previously read by sensor 13, it transmits a signal to the control unit 16 which stops the motors and thus the belt 2 stops in a front of sensor 12 in precisely the same position as it was found to be in front of sensor 13.
  • the screen-printing device comes into action and prints the first screen and a first operating cycle has than terminated.
  • sensor 13 reads the signal from the transducer located beneath it and transmits it to sensor 12 via the control unit 16.
  • the control unit 16 gives the command for the forward movement of the belt 2 and stops the belt when sensor 12 intercepts beneath it the same signal as that read and transmitted to it by sensor 13.
  • the screen-printing device then proceeds to print the second screen and so on. With this system sections of the conveyor belt 2, and thus of the fabric 7 to be printed, of a width Sr measured for each specific section of the belt are disposed under the screen-printing device.
  • All the data relating to the various subsequent printings are recorded by the control unit 16 for the whole length of the belt and thus, in the case of printing with several colours, the data are taken and repeated exactly as they were in the first run as many times as are required to print the colours of which the design is composed.
  • each specific element of the printing step Sr of the belt which has already been printed is re-presented for printing the next colour in precisely the same position under the screen-printing device as it was when the first colour was printed, thus obtaining a superimposition and alignment which are perfect in practice.
  • the flexible strip of thermoplastic material which can be magnetised can be inserted in the belt instead of being produced separately and applied to the belt, or it can be manufactured at the same time as the belt incorporating a side strip composed of thermoplastic material or magnetisable rubber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP88201918A 1987-09-25 1988-09-07 Dispositif pour régler le pas d'une machine à avance par intermittence, en particulier des machines à imprimer du pochoir Withdrawn EP0309023A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2203487 1987-09-25
IT22034/87A IT1222737B (it) 1987-09-25 1987-09-25 Dispositivo di guida e regolazione del passo di avanzamento nelle macchine operatrici ad avanzamento intermittente in particolare nelle stampatrici automatiche serigrafiche

Publications (2)

Publication Number Publication Date
EP0309023A2 true EP0309023A2 (fr) 1989-03-29
EP0309023A3 EP0309023A3 (fr) 1990-04-11

Family

ID=11190490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201918A Withdrawn EP0309023A3 (fr) 1987-09-25 1988-09-07 Dispositif pour régler le pas d'une machine à avance par intermittence, en particulier des machines à imprimer du pochoir

Country Status (2)

Country Link
EP (1) EP0309023A3 (fr)
IT (1) IT1222737B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0782921A1 (fr) * 1995-12-19 1997-07-09 Viero S.R.L. Machine à imprimer comprenant une bande rotative et un dispositif de positionnement comprenant un détecteur optique linéaire
EP0782922A1 (fr) * 1995-12-19 1997-07-09 Viero S.R.L. Méthode de synchronisation d'une machine d'impression du type comprenant des cylindres d'impression et une bande rotative et une machine correspondante
ES2160034A1 (es) * 1998-02-17 2001-10-16 Francesco Schinco Maquina para la decoracion serigrafica de baldosas.
CN110802936A (zh) * 2019-12-11 2020-02-18 浙江宝石蝶围巾有限公司 一种丝毛围巾台板印花方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES280690A1 (es) * 1961-09-27 1963-03-16 Heberlein & Company A G Un dispositivo, especialmente en instalaciën de impresiën al cuadro para el secado de colores de estampaciën
US3482316A (en) * 1965-03-08 1969-12-09 Keuffel & Esser Co Magnetic tape gage
JPS606463A (ja) * 1983-06-24 1985-01-14 Toshin Kogyo Kk 連続多色印刷方法及び装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0782921A1 (fr) * 1995-12-19 1997-07-09 Viero S.R.L. Machine à imprimer comprenant une bande rotative et un dispositif de positionnement comprenant un détecteur optique linéaire
EP0782922A1 (fr) * 1995-12-19 1997-07-09 Viero S.R.L. Méthode de synchronisation d'une machine d'impression du type comprenant des cylindres d'impression et une bande rotative et une machine correspondante
ES2160034A1 (es) * 1998-02-17 2001-10-16 Francesco Schinco Maquina para la decoracion serigrafica de baldosas.
CN110802936A (zh) * 2019-12-11 2020-02-18 浙江宝石蝶围巾有限公司 一种丝毛围巾台板印花方法

Also Published As

Publication number Publication date
IT8722034A0 (it) 1987-09-25
EP0309023A3 (fr) 1990-04-11
IT1222737B (it) 1990-09-12

Similar Documents

Publication Publication Date Title
US5255598A (en) Screen printing device with continuous registering of rotating stencils
US5313886A (en) Electronic method of positioning a register mark sensor of a sheet printing machine
US4007866A (en) Web transport arrangement
US4557372A (en) Belt system with alignment apparatus
US4067760A (en) Gate control for printed web scanner
US4391190A (en) Pre-setting of printing machines
JPS6114896A (ja) ウエブ材のための鋳型切断プレス
US4984458A (en) System for measuring the relaxed length of a moving web
US5777878A (en) Screen printing press having longitudinal, lateral and angular screen frame registration system and method
US5968303A (en) Method and apparatus for sticking a label
EP0309023A2 (fr) Dispositif pour régler le pas d'une machine à avance par intermittence, en particulier des machines à imprimer du pochoir
US5706722A (en) Process for controlling a cylinder-type silk screen printing machine
EP0393158B1 (fr) Appareil de commande d'alimentation de ruban
CA1065688A (fr) Systeme et methode de commande de piqure automatique pour machines a coudre
CA1116724A (fr) Entrainement de ruban a vitesse et tension constantes pour imprimante
US4947685A (en) System for measuring the repeat length of a moving web
EP0446977B1 (fr) Dispositif pour guider et régler le pas d'avance lors du fonctionnement de machines à mouvement d'avance intermittent, en particulier pour une machine automatique de sérigraphie
US4191118A (en) Automatic stitching pattern control system and method for a sewing machine
GB1410352A (en) Detecting misregistration between a continuous web of material and format providing means
JP2632304B2 (ja) 見当プリセツト装置
EP0727315A2 (fr) Méthode d'impression de lettres pour une machine d'emballage
US4200049A (en) Method for automatic stitching
DE3273272D1 (en) Apparatus for and method of varying the position of an operation performed on an elongate moving element
EP0687560A1 (fr) Machine d'impression à haute précision, spécialement pour tissus ou similaires, avec plusieurs unités d'impression
US4147440A (en) Sliding code disc reader and detent therefor for dual pitch web feeding

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19900514

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920401