EP0446977B1 - 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 - Google Patents

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 Download PDF

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Publication number
EP0446977B1
EP0446977B1 EP91200351A EP91200351A EP0446977B1 EP 0446977 B1 EP0446977 B1 EP 0446977B1 EP 91200351 A EP91200351 A EP 91200351A EP 91200351 A EP91200351 A EP 91200351A EP 0446977 B1 EP0446977 B1 EP 0446977B1
Authority
EP
European Patent Office
Prior art keywords
belt
teeth
conveyor
encoder
machine
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
EP91200351A
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German (de)
English (en)
Other versions
EP0446977A1 (fr
Inventor
Luigi Salvade'
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.)
SALVADE SpA
Original Assignee
SALVADE SpA
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Filing date
Publication date
Application filed by SALVADE SpA filed Critical SALVADE SpA
Publication of EP0446977A1 publication Critical patent/EP0446977A1/fr
Application granted granted Critical
Publication of EP0446977B1 publication Critical patent/EP0446977B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention described here is a control device for regulating the intermittant forward feed step of a machine that is fitted with a closed loop conveyor belt or similar piece of equipment, where great precision in the intermittant forward feed step is required, especially when the belt is of a considerable length, 80 metres or more.
  • the device is especially applicable to automatic silk-screen printing machines, but can equally well be applied to all machines with an intermittant feed of considerable length, where the step is required to be particularly precise, without the precision being compromised by errors caused by the length of the machine or the conditions in which it operates.
  • the device where a rotating incremental encoder transducer which measures movement is turned by a rubber roller attached to the encoder shaft that rubs against the rubber belt on the machine; the type where the encoder is turned by a toothed belt which is stretched around two toothed rollers and whose flat side, suitably ridged, is placed in contact with and drawn along by the conveyor belt on the machine, and movement is measured by the encoder having a toothed shaft which is in contact with either one of the two toothed wheels that tension the belt or with the teeth on the belt itself; the type where either the belt or a steel strip which is attached to the side of the belt and fuctions as a guide, support, and gives additional lengthwise rigidity, has holes at regular intervals which engage with teeth on the edges of the drive rollers and the encoder shares the same axle as the drive roller; and the system which is commonly used on machine tools for measuring spindle head movement where the encoder is connected to a rack.
  • the second category includes the system using a position marker which is printed on the conveyor belt before the first colour is printed, and a sensor is used to detect these markers and thus control the forward feed of the conveyor belt; and the system where magnetic transducers with a position detector are used to read a rigid scale which is no more than about three metres in length, so that, although this system has proved useful on machine tools, it cannot be practically applied to long belts or similar items of equipment (large diameter rotating tables, etc.).
  • a non-rigid magnetic position transducer is applied to one of the sides of the conveyor belt.
  • the transducer is made of a strip of flexible magnetizeable material, and is magnetized with an alternate polarity at regular intervals, and magnetic detectors are placed at suitable intervals. They are coupled to a step counting device which corresponds to the precise nominal printing distance step, and one of the two detector devices is mounted on a bar whose length can be adjusted so that the machine can be adapted to different printing step lengths.
  • the two detector heads can communicate, so that the first detector head transmits the data it has detected to the second, so that the second detector head stops the belt in correspondence to to the power line that the first head recorded as the start point, at a distance which corresponds to the precise distance between the two heads, thus ensuring that each distance along the strip corresponds to one printing step and becomes an element in itself, and the system functions as if it was controlled by the system which uses a rigid magnetic detector transducer.
  • the invention described here is similar to the systems in the first category where a rotating incremental type encoder is mechanically driven by the conveyor belt.
  • the encoder is inserted in a structure consisting of two gear wheels around which a rubber belt which is toothed on both sides passes.
  • the belt is of a high pecision type, such as those currently normally used in robots or plotters, and is in contact with either a second toothed belt which runs along one side of the conveyor belt or its side strengthening strip.
  • the teeth on the transducer assembly engage with teeth on the upper surface of the side strengthening strip, so as to form a flexible rack, and the two rollers at the ends of the conveyor belt are both motorized and their speeds are perfectly synchronized.
  • the invention can be better understood by the following example of its use, to which it is not limited, where it has been applied to a silk-screen printing machine with a closed loop conveyor belt, although the invention can equally be applied to silk-screen printing machines with rotating tables, or silk-screen printing machines for pre-cut fabrics, or to any machine of considerable length which uses a flexible support and to which the system where an encoder is driven by a rack cannot be applied.
  • (1) is an automatic silk-screen printing machine for fabrics, consisting of a conveyor-belt (2) which is tensioned around two drive rollers (3 and 4) which are driven by two DC motors (5 and 6). Their speed is perfectly synchronized so the the conveyor belt (2) is perfectly tensioned both on its upper and lower surfaces.
  • the length of fabric to be printed (7) is glued to the conveyor belt, shown as a dotted line in figure 1, so that an 80 metre length of cloth can be printed on a machine 40 metre long.
  • a drying kiln (8) is mounted on the final upper part of the machine, according to the direction in which the belt rotates, and is heated by infra-red lamps (9), for example.
  • the automatic silk-screen printing device (10) is mounted on the other end of the belt, preferably but not necessarily in its initial area, as is outlined in the figures.
  • a toothed belt (11) has been applied as shown in figure 3, consisting of a flexible belt made of a suitable material, such as rubber or thermoplastic, and one of its sides is toothed.
  • the detection device (12) is attached to the structure of the machine so that it is above and engages with the toothed belt (11), in such a way that it is driven by the toothed belt (11).
  • the detection device is constructed as in figure 3, and consists of a support structure, which is not shown in the figure, with a gear wheel (14) at one end and two smaller gear wheels (15 and 16) at the other end which keep a flexible belt loop with teeth on both sides (13) tensioned and in a loop.
  • This double toothed belt is of the type commonly used in industrial robots and plotters, and forms a kind of track.
  • a gear wheel which is attached to the drive shaft of an encoder (17) is positioned between the two smaller diameter gears and engages with the external teeth on the toothed belt (13).
  • the above described structure forms a type of track, and there is a guide (18) on its base that ensures that the external teeth in the double-toothed belt (13) engage correctly with the teeth on the single-toothed belt (11) which is attached to the side of the conveyor belt on the machine.
  • Figure 4 shows a variation to the example shown in figure 3.
  • the drive assembly for the encoder (22) is again driven by a kind of track (23), however in this example the two gear wheels (24 and 25) are of the same diameter, and a gear wheel which is attached to the encoder drive shaft (27) is mounted between the two belt tensioning gear wheels in such a way that the gears engage with the teeth on the internal part of the double-toothed drive belt (23).
  • teeth (21) with the same length as the double-toothed drive belt teeth (23) can be applied directly to it, instead of using a toothed belt that has been glued to the metal strip.
  • the external teeth on the drive belt (23), as shown in figure 4 engage equally well with the teeth (21) on the side rigidity strip because there is a guide (28) in between the two gear wheels (24 and 25) on the device (22), which ensures that the teeth on the belt (23) engage with the teeth on the side strip (21).
  • the rotating transducer (17 or 27) outputs electric signals corresponding to the rotation of its drive shaft on the basis of movements of the drive belt (13 or 23), and therefore of the movement of the conveyor belt on the machine. These signals are transmitted to a calculator which processes them, and are then transferred to the conveyor belt (2) drive motors (5 and 6) on the machine, so that precisely equal movements between one print and the next can be obtained.
  • step distance (Sr) between one print and the next is calculated depending on the pattern to be printed, on the basis of the number of encoder drive shaft turns or fractions of turns.
  • the machine operator gives the control unit the OK to set the machine in motion, and the operating cycle that then takes place includes the following steps:
  • the control unit gives the OK for the forward feed of the conveyor belt, and the motors (5 and 6) begin to operate and drive the belt forward in the direction of the arrow for a distance equal to the set step distance (Sr) on the basis of the number of encoder drive shaft (17 or 27) turns or fractions of turns.
  • Sr set step distance
  • the silk-screen printing device (10) then begins to operate and prints the first section.
  • Each section (Sr) of the previously printed fabric is ready to have a second colour printed on top and is in precisely the same position as it was when the first colour was printed, so that alignment and printing are virtually perfect. This is also due in part to the fact that the two rollers (3 and 4) over which the conveyor belt is tensioned each have a drive motor (5 and 6) which are perfectly synchronized so that the teeth (11 or 21) on the conveyor belt always perfectly engage those on the detector drive belt (12 or 22).
  • the description is based on how the system can be applied to an automatic silk-screen printing machine for fabrics, the invention can also be applied to cylinder presses for fabrics, where the system is used to synchronize the rotation of the roller and movement of the belt beneath.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)

Claims (4)

  1. Dispositif pour guider et régler le pas d'avance lors du fonctionnement de machines à mouvement d'avance intermittent, en particulier pour les machines automatiques de sérigraphie, comprenant un type d'encodeur rotatif supplémentaire (17 ou 27) qui fixe la longueur de chaque pas (sr) du convoyeur (2) caractérisé par le fait que le type d'encodeur rotatif supplémentaire (17 ou 27) est inséré dans une structure de roulement formée de 2 ou de plusieurs roues à engrenages (14-15-16 ou 24-25) autour desquelles court un tapis roulant de haute précision doté de dents sur les deux côtés (13 ou 23) qui s'engage sur une deuxième ceinture dentelée (11) qui tourne autour de l'un des côtés du convoyeur (2) sur la machine, ou avec l'une des lames de côté d'acier qui renforcent le convoyeur (2) et dont les dents (21) s'appuient sur sa surface supérieure de façon à former une crémaillère flexible.
  2. Dispositif comme de Revendication 1, caractérisé par le fait que les deux rouleaux (3 et 4) qui tendent et guident le convoyeur (2) sont tous deux raccordés à un moteur (5 et 6), et que la vitesse de ces deux moteurs est parfaitement synchronisée de façon à ce que le convoyeur soit parfaitement tendu et que les dents du ruban (11 ou 12) s'encastrent parfaitement dans les dents de la ceinture de guide de l'encodeur (12 ou 22).
  3. Dispositif comme de Revendication 1, caractérisé par le fait que le type d'encodeur rotatif supplémentaire peut être aussi bien accouplé avec les dents externes (17, figure 3) qu'avec les dents internes (27, figure 4) du double tapis roulant dentelé (13 ou 23) qui soutient, guide et raccorde l'encodeur (17 ou 27) au convoyeur de la machine sur lequel le tissu est fixé.
  4. Dispositif comme de Revendications 1 et 2, caractérisé par le fait qu'il y a un guide (18 ou 28) sur la base du tapis roulant dentelé (13 ou 23) dont le but est de s'assurer que les dents externes de tapis roulant (13 ou 23) s'encastrent parfaitement dans les dents du ruban dentelé (11) ou avec les dents (21) assemblées au convoyeur (2) ou à la lame de métal de côté qui le renforce.
EP91200351A 1990-02-27 1991-02-19 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 Expired - Lifetime EP0446977B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1950190 1990-02-27
IT19501A IT1241064B (it) 1990-02-27 1990-02-27 Dispositivo di guida a regolazione del passo di avanzamento nelle macchine operatrici ad avanzamento intermittente in particolare per le stampatrici automatiche serigrafiche a quadri

Publications (2)

Publication Number Publication Date
EP0446977A1 EP0446977A1 (fr) 1991-09-18
EP0446977B1 true EP0446977B1 (fr) 1994-07-06

Family

ID=11158561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200351A Expired - Lifetime EP0446977B1 (fr) 1990-02-27 1991-02-19 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

Country Status (4)

Country Link
EP (1) EP0446977B1 (fr)
AT (1) ATE108131T1 (fr)
DE (1) DE69102721D1 (fr)
IT (1) IT1241064B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052353A1 (fr) * 2012-09-25 2014-04-03 Highland Industries, Inc. Tissu sergé à deux fontures pour des courroies de transmission de puissance et courroies composées de ce dernier

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0736379A3 (fr) * 1995-03-14 1997-08-13 Salvador Gali Machine d'impression sérigraphique à longue table avec propulsion équilibrée et répétition équidirectionelle compensée réglable
US5917602A (en) * 1998-04-30 1999-06-29 Inex Inc. System and method for image acquisition for inspection of articles on a moving conveyor
DE50101653D1 (de) * 2001-01-25 2004-04-15 Tecan Trading Ag Maennedorf Verschiebeeinrichtung mit einem in eine Zahnstange eingreifenden Zahnriemen
CN102114728B (zh) * 2010-01-01 2014-07-16 如皋市天元服饰印业有限公司 自动平板印花机

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242846B1 (fr) * 1986-04-23 1992-10-07 MS MACCHINE E SISTEMI S.r.l. Machine d'impression au cadre d'articles textiles et analogues

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052353A1 (fr) * 2012-09-25 2014-04-03 Highland Industries, Inc. Tissu sergé à deux fontures pour des courroies de transmission de puissance et courroies composées de ce dernier

Also Published As

Publication number Publication date
IT9019501A1 (it) 1991-08-27
EP0446977A1 (fr) 1991-09-18
IT9019501A0 (it) 1990-02-27
ATE108131T1 (de) 1994-07-15
IT1241064B (it) 1993-12-29
DE69102721D1 (de) 1994-08-11

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