EP0097629A1 - screen printing machine having a material conveyor - Google Patents

screen printing machine having a material conveyor Download PDF

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Publication number
EP0097629A1
EP0097629A1 EP83850139A EP83850139A EP0097629A1 EP 0097629 A1 EP0097629 A1 EP 0097629A1 EP 83850139 A EP83850139 A EP 83850139A EP 83850139 A EP83850139 A EP 83850139A EP 0097629 A1 EP0097629 A1 EP 0097629A1
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
registration
conveyor
screen printing
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Withdrawn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
EP83850139A
Other languages
German (de)
English (en)
French (fr)
Inventor
Sylve Jack Donald Ericsson
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.)
Svecia Silkscreen Maskiner AB
Original Assignee
Svecia Silkscreen Maskiner AB
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 Svecia Silkscreen Maskiner AB filed Critical Svecia Silkscreen Maskiner AB
Publication of EP0097629A1 publication Critical patent/EP0097629A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
    • 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
    • B41F15/0813—Machines for printing sheets with flat screens
    • B41F15/0818—Machines for printing sheets with flat screens with a stationary screen and a moving squeegee

Definitions

  • the present invention relates to a screen printing machine, and in particular to a screen printing machine of a kind which utilizes a material conveyor.
  • the present invention is particularly appropriate to a screen printing machine in which an endless conveyor belt is used as the material conveyor.
  • the conveyor belt is driven for this purpose by a power source, usually in the form of a d.c. motor, of such a kind that it is able to cause the conveyor belt to stop in a first position for the registration of a material to be printed which is resting on the belt, and then to convey the material to a printing position. In this printing position, print corresponding to the pattern on a stencil shall be applied to the material.
  • the conveyor belt It is usual for the conveyor belt to be supported on and to be advanced over a supporting surface positioned beneath the conveyor belt, thereby causing the conveyor belt to rest on a flat supporting surface, both in the registration position of the material and in the printing position of the material, i.e. the position in which print is applied to the material.
  • the synchronization device described includes a rotating impulse generator which is driven by a sensor wheel in contact with the supporting belt. This is intended to produce impulses corresponding to the Linear speed of the supporting belt.
  • An amplifier and a pulse transformer for amplifying and transforming the impulses produced by the impulse generator are used for driving a stepping motor and a four-way control valve for regulating a flow of oil. This flow of oil shall be proportional to the movement of a screw and this is driven by the stepping motor via a reduction gear.
  • the description of the prior art must also include a screen printing machine having an endless conveyor belt as the material conveyor, said conveyor belt being driven by a power source so that it is able to come to a halt in a first position for the registration of the material intended for printing, and is then able to convey the material to and to come to a halt at a printing position in which print corresponding to the pattern on a stencil is applied to the material.
  • a screen printing machine having an endless conveyor belt as the material conveyor, said conveyor belt being driven by a power source so that it is able to come to a halt in a first position for the registration of the material intended for printing, and is then able to convey the material to and to come to a halt at a printing position in which print corresponding to the pattern on a stencil is applied to the material.
  • the movement of the conveyor belt is sensed, before the material is moved from the registration position to the printing position, by means of a movement-sensing device having a resolution of 0.5 mm.
  • This device is connected to a counter which, at a pre-determined setting corresponding to the total distance covered by the conveyor belt between the first position and the second position, wiLL generate an activating signal which will cause the power source to bring the conveyor belt to a halt, when the material will then adopt the second position.
  • a screen printing machine of the type indicated above is described in greater detail in Swedish Patent AppLication 79 01808-1.
  • a screen printing machine having an endless conveyor belt as the material conveyor and in which said conveyor belt is driven by a power source designed in such a way as to be capable of bringing the belt to a halt in a first position for the purpose of registering the material to be printed, and of then conveying the material to a printing position for the purpose of causing the material to come to a halt in the printing position, and capabLe when in said printing position of applying to the material accurate print corresponding to the pattern on a stencil, presents a highly specific problem.
  • the first problem referred to above has been found to be attributable principally to the fact that the conveyor belt must be provided with a join. It has been found to be practically impossible to make this join of identical uniformity to the rest of the conveyor belt.
  • the endless conveyor belt must pass over a number of drive roLLers, idler rollers and Link rollers, and the deflection of the belt occurs to all intents and purposes only in a single direction. As the join passes over these rollers, the radius of the belt will vary depending on whether it is the uniform belt or the join in the belt which is passing over the roller. This is particularly true of the drive rollers and the idler rollers.
  • the drive rollers and idler rollers in particular may exhibit diameters which differ considerably, being of the order of magnitude of 200 mm, and this naturally means that even a small difference in the radius of the conveyor belt will cause it to produce a considerable registration error in the printing position if the distance covered by the belt between the registration position and the printing position is measured by previously disclosed methods. This is the case, of course, when the distance covered by the conveyor belt is measured by the drive rollers or the idler rollers. If the variation in the diameter is assumed to be of the order of magnitude of 0.1 mm, then the conveyor belt will produce a registration error of the order of magnitude of 0.3 mm for each roller having a contact arc of 180 0 .
  • the Latter problem may be regarded as actually having already been solved. '
  • a screen printing machine having a material conveyor driven by a power source so that it will be able to convey the material to and to come to a halt at a printing position in which print corresponding to the pattern on a stencil may be applied to the material, in addition to which the material conveyor is so affected by the power source that the material conveyor is driven at a high speed which, before the printing material for the material is reached, is reduced to a Low speed so that the material is slowly advanced to its printing position.
  • the invention proposes that the front edge of the material be capable of being sensed as it assumes a pre-determined position by means of a registration device which does not touch the material, and that the material conveyor be so arranged as to come to a halt as the result of the activation of the registration device.
  • the transport of the material from the registration position to the printing position takes place as rapid acceleration, as a constant or essentially constant rate of advance and as rapid retardation, and the final registration takes place at a very Low rate of advance.
  • the present invention proposes that an organ for sensing and registering the front edge of a sheet of material may be executed in the form of a Laser beam which, by its reflection from the edge of the material or in some similar fashion, will immediately cause the power source to halt the transport of the material.
  • the advantages which may be regarded as being associated with the present invention are that the distance over which the conveyor belt advances between the registration position for the material and the printing position for the material is achieved by, amongst other things, the sensing of the front edge of the material as this moves into the printing position.
  • the endless conveyor belt used as a supporting surface has been given the reference designation 2 , and this conveyor belt is also used as the material conveyor.
  • On the conveyor belt 2 rests a first sheet of material 3 in the form of a thin sheet of glass, said sheet of glass requiring to be registered, i.e. to be advanced to a precise position in relation to the frame 1' of the screen printing machine.
  • the conveyor belt 2 is driven by a power source not shown in Figure 1, in the form of a d.c. motor.
  • This d.c. motor is controlled by a four-quadrant thyristor controller in such a way that it is able to stop the conveyor belt in a first position, for the purpose of registering the material 3 intended for printing in the position shown in Figure 1, and is then able to transport the material 3 , resting on the conveyor belt 2 , to the printing position, in which a second sheet of material is shown having the reference designation 3' .
  • print corresponding to the pattern on a stencil is applied to the material.
  • the stencil is not shown in the Figure for reasons of clarity, although it may be stated that the stencil is clamped in a frame 4 in a previously disclosed manner.
  • a scraper arrangement 5 ink placed on the upper surface of the stencil is forced through holes formed in the stencil, and in this way a printed image is applied to the material 3' in the position intended for printing.
  • the material 3 in the first registration position in accordance with Figure 1 is capable of being influenced by a flow of air directed from below, said flow of air permitting reduced friction between the material and its supporting surface in the form of the conveyor belt 2 .
  • This facilitates the movement of the material 3 by the registration organ 6 for the front edge of the material 3a and the registration organ 7 for the LateraL edge of the material 3b .
  • Registration organs 8, 9 for the front edge of the material 3c are also provided.
  • the material 3 can now be moved by the registration organs 6, 7, 8 and 9 into the exact registration position in the presence of only negligible friction between the material 3 and the conveyor belt 2 .
  • the extent of the frictional force which must exist between the material 3 and the conveyor belt 2 in order to achieve good registration is determined in practice from one material to the next by increasing or reducing the LeveL of the flow of air beneath the material.
  • the material 3 must, after having been registered by the organs 6, 7, 8 and 9 , be subjected to increased friction against the supporting component or the conveyor belt 2 , and this may be achieved through the effect of Low pressure applied from below.
  • This Low pressure or some other similar negative pressure, is effective for the whole of the distance covered by the material 3 to the printing position in Figure 2 and also during the printing phase itself.
  • the supporting surface for the material consists of the endless conveyor belt 2 .
  • This belt should be specially treated so as to eliminate all variations in thickness to the greatest possible extent.
  • Beneath the conveyor belt 2 is situated a supporting surface or a so-caLLed pressure table, said pressure table being divided up into sections.
  • the conveyor belt 2 thus runs over the entire pressure table.
  • the pressure table is provided with a number of holes, at the same time as the conveyor belt also has a number of holes.
  • the pressure table is divided up into a number of sections, whereby each section is connected to a tube.
  • a first tube interacts with a hose 10a
  • a second tube interacts with a hose 11a
  • a third tube interacts with a hose 12a .
  • Each and every one of these hoses 10a, 11a and 12a runs to a valve not shown here.
  • the transport of the material to the registration position in accordance with Figure 1 may take place as rapid acceleration, as a constant or essentially constant rate of advance and as rapid deceleration, and finally as a very Low rate of advance.
  • LateraL registration organs 6 and 7 are activated for the purpose of registering the Lateral edges 3a and 3b of the material whilst the front edge of the material is in contact with the front registration organs 8 and 9 , which causes the material to be registered before the conveyor belt 2 stops, which means that the conveyor belt slides beneath the material 3 .
  • the registration devices 8 and 9 for the front edge of the material 3c are able to fold out of the way against a spring, thereby absorbing the kinetic energy stored in the material 3 when it is moved into the registration position by a conveyor not shown in the Figure.
  • a prerequisite for the precise registration of the material in the printing position in accordance with Figure 2 is that the conveyor belt 2 must have a direction of movement which coincides exactly with the centre-Line of the conveyor belt, i.e. the belt must not be permitted to have any LateraL displacement.
  • the edge surface 2a of the conveyor belt 2 is equipped with a number of control organs 25 .
  • These control organs are positioned at equal distances along the conveyor belt 2 and are so arranged as to be controLLed by a number of guides in a fixed relationship to the frame 1' of the screen printing machine.
  • the preferred embodiment proposes that the movement of the conveyor belt 2 be sensed by a movement-sensing organ 40 .
  • This organ 40 must interact with the belt 2 at some point between the registration position of the material (Fig. 1) and the printing position (Fig. 2).
  • This organ consists of an "optical shaft encoder", i.e. a device which generates a coded signal by optical means.
  • the device may be of the kind sold by "Data TechnoLogy Inc.”, Mass., USA under the model designation OM25, which is designed to generate 2500 impulses per revolution.
  • the Line 43 is connected to a counter 44 of the type "ELectronic Digital Present Counter” manufactured by (NLS) Non Linear System Corp., Calif., USA under the model number PR-S.
  • the wheel 42 is in contact with the conveyor belt 2 and in this way is able to measure the distance covered by the belt and the material between the position shown in Figure 1 and the position shown in Figure 2.
  • the Line 43 is connected to the electronic counter 44 , which counts every small section of Length.
  • a pre-determined value may be set on this counter, and the set value must then be Less than the distance covered by the conveyor belt 2 between the first position shown in Figure 1 and the second position shown in Figure 2, and when the set value on the counter is reached an activating signal shall be generated at that point via a Line 45 .
  • This activating signal shall influence the power source, in the form of a d.c. motor 46 , and shall cause the driving motor and the conveyor belt 2 to slow down so that the material 3' is slowly advanced towards the second position in accordance with Figure 2.
  • This four-quadrant thyristor controller is able via a sinusoidal oscillation to drive a d.c. motor in either of two directions.
  • the counter 44 is so arranged that it will, via the signal on the Line 45 , control the thyristor controller and the power source 46 as far as the Low rate of advance, and as soon as the pre-determined value has been reached on the counter 44 the control function will be assumed by a registration organ which does not touch the material and which will be described Later.
  • the Laser beam 21 constitutes the registration Line for the part at the front edge 3c' of the material 3' .
  • the Laser device 20 could be one of the argon Lasers sold by "Spectra Physics, California, USA", under the model designation "171-03" .
  • the laser beam could also be so arranged as to be reflected by the part 3c' of the edge of the material.
  • the idea of invention also includes contactless registration against registration marks or registration holes in the material.
  • the power source 46 is activated so as to drive a wheel 46a , which in a previously disclosed manner is connected to the conveyor belt 2 .
  • the power source 46 is influenced for the rapid acceleration and for the essentially constant rate of advance, and as soon as the wheel 46a has turned for the transport distance "e" in Figure 5 a switch 48 is activated, the effect of which is fed into the control device 47 via a Line 49 .
  • This causes the rapid retardation to be engaged, and during the transport period "f" the coupling organ 44 assumes control of the power source 46 in the manner described above, and the stop signal is generated via the Line 23 .
  • This embodiment is preferred because it will cause the printing machine to halt in the same position in each cycle, so that the acceleration, the constant rate of advance and the rapid retardation wilt occur in such a sequence and for such periods that the material will be able to adopt the precise position for printing during the slow rate of advance.
  • cam wheel 52 makes it possible, however, to achieve very rapid material transport until the material reaches a position immediately ahead of the registration position, and enables this to be repeated time after time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Conveyors (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Screen Printers (AREA)
  • Registering Or Overturning Sheets (AREA)
EP83850139A 1982-05-24 1983-05-24 screen printing machine having a material conveyor Withdrawn EP0097629A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8203205A SE454497B (sv) 1982-05-24 1982-05-24 Stenciltryckmaskin med en materialtransportor
SE8203205 1982-05-24

Publications (1)

Publication Number Publication Date
EP0097629A1 true EP0097629A1 (en) 1984-01-04

Family

ID=20346879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83850139A Withdrawn EP0097629A1 (en) 1982-05-24 1983-05-24 screen printing machine having a material conveyor

Country Status (3)

Country Link
EP (1) EP0097629A1 (sv)
JP (1) JPS592846A (sv)
SE (1) SE454497B (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598971A1 (fr) * 1986-05-23 1987-11-27 Freminet Dany Perfectionnements aux dispositifs de marge automatique pour machine a imprimer en serigraphie a plateau sortant.
US5595113A (en) * 1994-10-25 1997-01-21 M & R Printing Equipment, Inc. Sequencing system for printing machine
CN113878986A (zh) * 2021-11-23 2022-01-04 嘉兴柏锐印刷有限公司 一种全自动印刷机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB838187A (en) * 1958-06-20 1960-06-22 Siemens Ag Improvements in or relating to apparatus for cutting plate glass produced in a continuous ribbon
US3190518A (en) * 1962-11-07 1965-06-22 Saint Gobain Corp Apparatus for cutting, transporting and distributing glass sheets
US3949864A (en) * 1974-06-08 1976-04-13 Maquinaria De Impresion Textil, S.A. Fabric printing machine
GB2045728A (en) * 1979-04-05 1980-11-05 Svecia Silkscreen Maskiner Ab Screen printing machine having registration means

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5442485A (en) * 1977-09-06 1979-04-04 Yukiharu Matsushita Pattern matching method of multicolor screen printing for towell cloth
JPS5928181B2 (ja) * 1978-04-28 1984-07-11 明和機械株式会社 タオル用自動捺染機
SE426926B (sv) * 1979-02-28 1983-02-21 Svecia Silkscreen Maskiner Ab Stenciltryckmaskin med materialtransportor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB838187A (en) * 1958-06-20 1960-06-22 Siemens Ag Improvements in or relating to apparatus for cutting plate glass produced in a continuous ribbon
US3190518A (en) * 1962-11-07 1965-06-22 Saint Gobain Corp Apparatus for cutting, transporting and distributing glass sheets
US3949864A (en) * 1974-06-08 1976-04-13 Maquinaria De Impresion Textil, S.A. Fabric printing machine
GB2045728A (en) * 1979-04-05 1980-11-05 Svecia Silkscreen Maskiner Ab Screen printing machine having registration means

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598971A1 (fr) * 1986-05-23 1987-11-27 Freminet Dany Perfectionnements aux dispositifs de marge automatique pour machine a imprimer en serigraphie a plateau sortant.
EP0248752A1 (fr) * 1986-05-23 1987-12-09 Dany Freminet Perfectionnements aux dispositifs de marge automatique pour machine à imprimer en serigraphie à plateau sortant-
US4760786A (en) * 1986-05-23 1988-08-02 Dany Freminet Apparatus for the automatic feeding of silk screen printing machines with run-out platen
US5595113A (en) * 1994-10-25 1997-01-21 M & R Printing Equipment, Inc. Sequencing system for printing machine
US5678482A (en) * 1994-10-25 1997-10-21 M&R Printing Equipment, Inc. Sequencing method for printing machine
CN113878986A (zh) * 2021-11-23 2022-01-04 嘉兴柏锐印刷有限公司 一种全自动印刷机

Also Published As

Publication number Publication date
SE8203205L (sv) 1983-11-25
SE454497B (sv) 1988-05-09
JPS592846A (ja) 1984-01-09

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

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Effective date: 19840905

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Inventor name: ERICSSON, SYLVE JACK DONALD