EP1098768A1 - Printing unit with synchronised control for rotary or flat silk-screen printing machines - Google Patents
Printing unit with synchronised control for rotary or flat silk-screen printing machinesInfo
- Publication number
- EP1098768A1 EP1098768A1 EP99922162A EP99922162A EP1098768A1 EP 1098768 A1 EP1098768 A1 EP 1098768A1 EP 99922162 A EP99922162 A EP 99922162A EP 99922162 A EP99922162 A EP 99922162A EP 1098768 A1 EP1098768 A1 EP 1098768A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing unit
- cylinder
- printing
- unit according
- spindles
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/0804—Machines for printing sheets
- B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/004—Electric or hydraulic features of drives
- B41F13/0045—Electric driving devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/0831—Machines for printing webs
- B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts
-
- 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
-
- 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
- B41P2213/72—Driving devices for monocolour presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2215/00—Screen printing machines
- B41P2215/10—Screen printing machines characterised by their constructional features
- B41P2215/11—Registering devices
Definitions
- the present invention relates to a printing unit 5 with synchronised control, for rotary, frame or cylinder silk-screen printing machines, for printing of substrates, in particular of the textile type.
- the rotary printing machines which are known at 10 present comprise a plurality of printing units, which each support a silk-screen printing frame or cylinder; for each printing unit there are provided two spindles, which drive a ring of the cylinder.
- a unit is generally provided to control the rotation of each cylinder by means of a single shaft.
- the object of the present invention is thus to provide a printing unit with synchronised control, for rotary, cylinder machines, which eliminates the above- described disadvantages, i.e. to provide a substrate printing unit for rotary, cylinder machines in which there is radial synchronism between the various cylinders, and which does not give rise to undesirable secondary effects, in order to improve the definition of the printed product in comparison with the known art.
- a further object of the present invention is to provide a printing unit with synchronised control, for rotary, cylinder machines, in a manner which is sufficiently simple and with substantially low costs, as a result of the advantages obtained.
- Control of the rotation of the cylinder is undoubtedly the most important and most difficult aspect to be dealt with during functioning of a rotary machine, partly also owing to the various inaccuracies in construction of the cylinder, such as the lack of orthogonality of the etchings and/or the imperfect securing of the attachments or rings which are necessary for transmission of the rotary motion.
- the motion is transmitted to the two spindles in a manner which is completely independent and free from all mechanical constraints; this is achieved by means of direct connection of an electric motor for each spindle.
- the two spindles thus remain free from one another, and can rotate with phases which are displaced relative to one another by an appropriate angular value, so as to compensate for the errors of connection of the rings to the cylinder, which inevitably occur when the cylinder itself is fitted on the machine.
- An adaptive control which is allocated to an electronic processor applicative programme designed specifically for the system in question, monitors the difference in torque between the two motors, and provides the possibility in real time of obtaining variations of settings, for correct functioning of the machine, and the lack of orthogonality between the cylinder and conveyor belt is revealed by the increase in the value of the torque which is generated between the two motors.
- This therefore permits control of all the forces which are imparted to the conveyor belt, and by means of the control provided by the applicative programme, it is possible to optimise the positions of all the cylinders, in order to minimise these forces, and thus allow the belt to advance without deflections.
- figure 1 shows schematically a lateral view of a printing unit for rotary, frame silk-screen printing machines, according to the present invention
- - figure 2 is a view in cross-section along line II-II of figure 1, according to the present invention.
- the aforementioned figures show one of the printing units mounted conventionally on a rotary, cylinder machine, used for printing of substrates of the textile type, or more generally for other uses.
- rotary, frame or cylinder silk-screen printing machines comprise a plurality of printing units, each of which supports a silk-screen printing cylinder, which fixes colour printing in specific areas of the substrate, according to movement in a direction which is perpendicular relative to the direction of translation of a conveyor belt for the aforementioned substrate to be printed.
- the various printing units which act at successive moments on the various predetermined areas of the substrate, compose the required pattern on the substrate at the output from the rotary machine.
- Each printing unit supports a silk-screen printing cylinder 20, which in its interior contains blade or rod- type doctors, which print the dye onto pre-determined areas of a substrate, which is moved on a conveyor line or belt 40, positioned in a direction which is perpendicular relative to a longitudinal plane of symmetry of each cylinder 20, which passes through the axis of the belt.
- Each silk-screen printing cylinder 20 is rotated by means of two spindles 50, which are provided in the position of the two bases of the cylinder 20, at the sides of the conveyor belt 40.
- Each spindle 50 drives a ring 30 of the cylinder 20, by means of a toothed drive belt 10, whereas each spindle 50 is controlled by means of direct connection of a brushless-type electric motor 60, which is connected to a reduction gear 70 of the reduced play, epicycloidal type.
- the motor 60 rotates a pulley 80, which, by rotating in the direction of the arrow F in figure 1, drives the drive belt 10, which is connected by means of ball bearings with a small cross-section, to the ring 30 of the cylinder 20.
- the drive thus obtained guarantees that the spindles 50 are controlled without mechanical play.
- the motion is transmitted to the two spindles 50 of each cylinder 20 in a manner which is completely independent, and is free from any mechanical connection, such that the two spindles 50 are completely independent from one another, and can rotate according to angular directions with phases which are displaced as required, in order to compensate for any errors of connection of the rings 30 to the cylinders 20, during fitting of the cylinders 20 themselves on the printing machine .
- the two spindles 50 which are provided for each silk-screen printing cylinder 20, rotate in a manner which is perfectly synchronised with one another, compensation having been obtained for the inaccuracies relative to the construction of the cylinder 20 itself.
- This synchronism is obtained by piloting each brushless electric motor 60 associated with the respective spindle 50, by digital drives, which are actuated by an angular transducer integrated in each motor 60.
- the digital drives control the speed of the motors 60 in a closed loop, and are in turn controlled by microprocessors, which provide the axial control of each cylinder 20.
- the aforementioned microprocessors are contained in axis control cards which are integrated in an electronic processing system of the PLC type.
- the axis control cards comprise corresponding interfaces, which execute a control algorithm of the PID type; in particular, the axis control cards, which are actuated by means of a signal obtained from each angular transducer integrated in each electric motor 60, carry out position control of the motors 60 in a closed loop.
- Regulation of the PID type of the control cards is managed by means of an applicative programme for electronic processors, to be implemented on each printing machine.
- the software control unit of the machine monitors a difference in torque between the two motors 60 of each cylinder 20, and makes it possible to vary in real time the torque values of these motors 60, such that the said settings by a user guarantee correct functioning of the machine.
- the lack of orthogonality between each silk-screen printing cylinder 20 and the conveyor belt 40 is revealed by the increase in the torque value, which is generated between the two electric motors 60 of each cylinder 20 during functioning of the machine.
- each cylinder 20 thus makes it possible to control all the forces which are discharged onto the conveyor belt 40 during printing of the dye on the pre-determined areas of the work substrate, whereas by means of the software control, it is possible to optimise the positions of all the cylinders 20 present on a rotary machine, in order to minimise these forces, simultaneously synchronising the rotary motion of all the cylinders 20 with one another, and the motion of each cylinder 20 relative to the translation motion of the conveyor belt 40, such as to allow the belt, which supports the substrate, to be printed to advance without being deflected during the processing.
- the applicative software of the printing unit manages the regulation of the axis control cards according to the operative methods of the printing machine, so that the regulation of the PID type of the axis control cards takes place respectively according to tracking or positioning modes.
- the tracking mode consists of tracking by the motors 60 of a position reference which is obtained from an incremental transducer device fitted to a control motor for the conveyor belt 40.
- the commands for manual correction of the timing between the two motors 60 of each cylinder 20 which in fact operate by adding or subtracting a fixed, pre-determined speed value to or from the momentary speed value of each motor 60, throughout the duration of the command.
- the correction commands can be imparted to both the spindles 50, or to only one of them, in this case obtaining a reciprocal phase displacement value.
- the torque values applied to the two spindles 50 are acquired by the applicative programme, and displayed on appropriate screens; in addition, the differences between the torque values planned, and the abnormal values which can be encountered, are revealed.
- the microprocessors for the axis control cards are configured in the positioning mode.
- this step it is possible to execute an operation of resetting each parameter relative to the machine, which consists of searching for an unambiguous initial angular position for each spindle 50 of each printing unit; this position is detected by an optoelectronic transducer device which is integrated in each spindle 50, and the operation of resetting the machine parameters puts the two spindles 50 into phase with one another, relative to each cylinder 20, and relative to every other printing unit installed on the machine. Subsequently, it is possible to carry out automatic positioning of the rotary machine, i.e. to carry out a search for angular phase positions which are displaced relative to each pair of spindles 50 of a single printing unit, and of the two spindles 50 of one printing unit relative to the other units.
- the positioning is carried out on the basis of angular position values which are stored in a preceding repetition of the processing, or of theoretical angular position values obtained from the geometric characteristics and from the nominal development of the cylinders 20 used for all the printing units which are in use on a single machine.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Screen Printers (AREA)
- Rotary Presses (AREA)
- Non-Metallic Protective Coatings For Printed Circuits (AREA)
- Printing Methods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1998MI000854A IT1303912B1 (en) | 1998-04-22 | 1998-04-22 | SYNCHRONIZED CONTROL PRINTING UNIT FOR ROTARY MACHINES AQUADRI OR SCREEN PRINTING CYLINDERS |
ITMI980854 | 1998-04-22 | ||
PCT/EP1999/003009 WO1999054138A1 (en) | 1998-04-22 | 1999-04-16 | Printing unit with synchronised control for rotary or flat silk-screen printing machines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1098768A1 true EP1098768A1 (en) | 2001-05-16 |
EP1098768B1 EP1098768B1 (en) | 2002-08-21 |
Family
ID=11379865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99922162A Expired - Lifetime EP1098768B1 (en) | 1998-04-22 | 1999-04-16 | Printing unit with synchronised control for rotary or flat silk-screen printing machines |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1098768B1 (en) |
AT (1) | ATE222536T1 (en) |
AU (1) | AU3930699A (en) |
DE (1) | DE69902593T2 (en) |
IT (1) | IT1303912B1 (en) |
WO (1) | WO1999054138A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1307658B1 (en) * | 1999-02-01 | 2001-11-14 | Aisa Spa | ROTARY SCREEN PRINTING MACHINE FOR FLAT SHEETS SYNCHRONIZATION CONTROL BETWEEN THE ROTATION OF THE PRINT SCREEN AND |
ES2203303B1 (en) * | 2001-11-29 | 2005-02-16 | Rafael Pascual Bernabeu | MACHINE TO CALENDAR, STAMP, LOCK, RECORD AND BRUSH SIMULTANEOUSLY. |
JP6592692B2 (en) * | 2015-07-30 | 2019-10-23 | デュプロ精工株式会社 | Stencil printing machine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7200635A (en) * | 1971-01-21 | 1972-07-25 |
-
1998
- 1998-04-22 IT IT1998MI000854A patent/IT1303912B1/en active
-
1999
- 1999-04-16 EP EP99922162A patent/EP1098768B1/en not_active Expired - Lifetime
- 1999-04-16 AU AU39306/99A patent/AU3930699A/en not_active Abandoned
- 1999-04-16 WO PCT/EP1999/003009 patent/WO1999054138A1/en active IP Right Grant
- 1999-04-16 DE DE69902593T patent/DE69902593T2/en not_active Expired - Lifetime
- 1999-04-16 AT AT99922162T patent/ATE222536T1/en active
Non-Patent Citations (1)
Title |
---|
See references of WO9954138A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE222536T1 (en) | 2002-09-15 |
EP1098768B1 (en) | 2002-08-21 |
DE69902593T2 (en) | 2003-07-03 |
AU3930699A (en) | 1999-11-08 |
IT1303912B1 (en) | 2001-03-01 |
ITMI980854A1 (en) | 1999-10-22 |
WO1999054138A1 (en) | 1999-10-28 |
DE69902593D1 (en) | 2002-09-26 |
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