US3403622A - Web printing machines - Google Patents

Web printing machines Download PDF

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Publication number
US3403622A
US3403622A US579349A US57934966A US3403622A US 3403622 A US3403622 A US 3403622A US 579349 A US579349 A US 579349A US 57934966 A US57934966 A US 57934966A US 3403622 A US3403622 A US 3403622A
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US
United States
Prior art keywords
flight
web
roller
conveyor
speed
Prior art date
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Expired - Lifetime
Application number
US579349A
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English (en)
Inventor
Moser Hans Rudolf
Thierstein Hans
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.)
Fritz Buser AG Maschinenfabrik
Original Assignee
Fritz Buser AG Maschinenfabrik
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 Fritz Buser AG Maschinenfabrik filed Critical Fritz Buser AG Maschinenfabrik
Application granted granted Critical
Publication of US3403622A publication Critical patent/US3403622A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B41F15/18—Supports for workpieces
    • B41F15/24—Supports for workpieces for webs

Definitions

  • ABSTRACT OF THE DISCLOSURE A web printing machine of the kind having an endless conveyor belt trained over two spaced-apart rollers, a printing table associated with the web-carrying upper conveyor flight, means for moving the upper flight intermittently to carry the web to and from the printing table and means for continuously moving the lower flight, the latter means including means for displacing the rollers in unison toward and away from the respective ends of the printing table.
  • Improved operation is achieved by (1) mounting the roller which is nearest the point of engagement of the web with the conveyor belt for displacement in a direction inclined at an angle of -90 to the plane of the table and (2) engaging the web with the conveyor belt before the belt passes over the just-mentioned roller.
  • the present invention relates to web printing machines such as screen printing machines.
  • the textile or web which is supposed to receive the imprint is guided by means of a conveyor belt across a printing table. This movement takes place intermittently since the screen printing has to be carried out during the time that the web is at a standstill.
  • the periodic movement in the case of several screen printing machines of this kind, is produced through advancing elements, which for example have been arranged frictionally to engage the conveyor belt on both sides of the printing table, in order to move it by one unit length.
  • advancing elements for example have been arranged frictionally to engage the conveyor belt on both sides of the printing table, in order to move it by one unit length.
  • a piston which can slide within a cylinder and which can be acted upon by pressure oil, said piston being in constant connection with the advancing elements.
  • the supply roller is also displaced, so that during all the stages of operation, the web and the conveyor run off the supply roller and off the rotatable element, even though at a speed varying between a maximum and minimum value. Since the supply roller, acting at the same time as deflecting roller for the web to be printed is displaceable, the latter cannot be arranged very close to the web roll, which would result in an advantageous, continuously shorter web draw-01f.
  • the acceleration and retardation occurring with the variable conveyor speed and web speed, in addition to the long web feed is particularly disadvantageous in the case of stretchable printing fabrics.
  • a web printing machine comprising an endless conveyor trained around two rotatable elements, the upper flight of the conveyor being adapted to carry a web to be printed to and from a printing table, means being provided operative on the said upper conveyor flight for advancing the flight intermittently with intervening stops of given duration for printing onto the web, means for continuously moving the lower conveyor flight, which is between said rotatable elements, nothwithstanding intermittent movement of said upper conveyor flight, said rotatable elements being mounted for movement in unison towards and away from the respective ends of the printing table, the rotatable elements being advanceable through a predetermined distance, one towards and one away from the printing table, as the upper conveyor flight advances, and means responsive to the stopping of the upper conveyor flight for retracting said rotatable elements for said predetermined distance while said upper conveyor flight is stationary, at least the rotatable element situated nearer the point where the web joins the conveyor, being displaceable above the plane of the printing table in a direction ingllined at an angle of at least 45 to the
  • FIGURE 1 shows schematically, in side elevation, one embodiment of screen printing machine according to the invention
  • FIGURE 2 is an enlarged detail view of the machine according to FIGURE 1 showing the means for driving the lower flight;
  • FIGURE 3 shows a speed diagram for the infinitely variable gear for driving the lower flight
  • FIGURES 4 to 6 show different positions of control wheels for speed regulation.
  • FIGURE 1 there is shown the printing table 1 of a screen printing machine.
  • a printing conveyor belt 2 which passes around two opposite end rotatable elements in the form of rollers 3 and 4, extends with its upper flight 2a over the surface of the table 1, so that it is supported by the latter during printing.
  • the lower conveyor flight 2b extends under the table 1 through a washing installation 5 and a glue application device 6.
  • a piston 8 for driving the conveyor belt 2 in its upper flight 2a in the direction of an arrow A there is provided a piston 8 slidable in a cylinder 7 and having driving elements provided on rods 9, which elements, during the advancing movement of the piston 8 establish a releasable frictional connection with the belt 2.
  • the elements 10 may be, for example, hydraulically or magnetically operated tongs or suction shoes. Displacement of piston 8 in cylinder 7 is produced by the alternating action of pressurized oil on its two sides. This pressurized oil is pumped continuously by a pump 12 from a tank 11 and is fed to the cylinder 7 by way of a reversing valve 13 through pipes 14 and 15. The reversing valve 13 is controlled, for example, by a time-controlled servoelement 16.
  • the two rollers 3, 4 are displaceable from the end positions shown in solid lines to the end positions 3, 4' shown in chain lines. This means that the roller 4 mounted at the entry of the machine can be raised and lowered, and the roller 3 is horizontally displaceable.
  • the bearings 17, 18 of the rollers 3, 4 are connected together by a pull member, for example a chain 19, which is passed around deflecting wheels or sprockets 20-22. Instead, however, each bearing 17, 18 may be engaged by its own, for example weight-loaded, pull member, tending to pull the deflecting rollers 3, 4 apart for tensioning the conveyor belt 2.
  • the displaceable rollers 3, 4 with the conveyor belt 2 and the chain 19, when the machine is stationary, constitute a stable, motionless arrangement.
  • the natural weight of the roller 4 pulls the roller 3 by means of the chain 19 for tensioning the endless conveyor belt 2 to the right. in the drawing.
  • the conveyor belt 2 is also deflected by the stationary rollers 23, 24.
  • the web draw-off for example fabric draw-off, is effected from a reel 25.
  • the heating and pressing roller 26 is mounted on a lever 29, pivotal on the pin 28, and can bear with varying pressure on the roller 24.
  • the particular application pressure between the rollers 24, 26 depends on the speed of the lower flight 2b and hence on the peripheral speed of the roller 24.
  • the roller 24 drives a hydraulic pump 30, the hydraulic fluid from which acts through a conduit in a cylinder '32 and presses the heating and pressing roller 26 against the roller 24 by means of a piston 33 and the lever 29, with a pressure dependent on the speed of roller 24 and thus ensures constant adhesive force.
  • the lower flight 2b of the conveyor belt 2 is driven by a roller 34, which in its turn is driven by an electric motor 36 by means of a chain 35 via an infinitely variable gear, not shown.
  • the ends of a chain 37 are secured by cross-pieces 38 to the chain 19.
  • the chain. 37 drives a wheel '39.
  • the drive is effected via a control device, to be explained later, by means of a chain 40 onto the infinitely variable gear, not shown, of the motor 36.
  • the particular position of the cross-pieces 38, relative to the stationary motor 36 corresponds to a definite, adjusted driving speed of the roller 34.
  • the displacement travel of the chain 19, and hence of the cross-pieces 38 serves as an adjustment parameter for the controllable drive of the lower flight 2b.
  • the control is shown in FIGURE 2 and following figures and is explained later.
  • the fabric may be fed, as illustrated at 41, from the reel 25 over a straightening apparatus (not shown), a fabric web guide and possibly other devices, and thence via a deflecting roller 42 to the heating and pressing roller 26.
  • a straightening apparatus not shown
  • a fabric web guide and possibly other devices the fabric web guide and possibly other devices, and thence via a deflecting roller 42 to the heating and pressing roller 26.
  • This arrangement has the advantage that no part of the conveyor belt comes to a stop at the washing installation 5, at the glue application device 6 and at the sticking point on the rollers 24, 26 as long .as the machine is in operation. Due to the fact that the lower flight 2b runs off the rollers 24, 26 continuously, a continuous draw-ofl of the fabric from the reel 25 is ensured, either with the fabric 27 or 41. Due to the stationary rollers 24, 26, the draw-01f speed of the fabric 27 or 41 is equal to the speed of the lower flight 2b, and like the latter, is substantially less than the speed of the upper flight 2a during the intermittent movement. During the operation of the machine and at the commencement of the intermittent movement of the upper flight 2a, the rollers 3, 4 are approximately in the solid line position shown.
  • the elements 10 engage the top flight and displace the latter by a repeat length in the direction of the arrow A.
  • the roller 34 drives the lower flight 2b at a lower speed than the element 10 drives the upper flight 2a. Since, therefore, the belt length is not conveyed from the lower flight 2b over the roller 4 to the upper flight 2a, and at the roller 3 a larger belt length of the upper flight 2a obtains than can be conveyed by the slower drive of roller 34, the roller 4 moves vertically downward and the roller 3 outwardly to the right until the rollers 3, 4 are situated approximately in their position according to 3', 4'. During the printing process the upper flight 2a is at rest.
  • roller 34 continuing to drive, exerts a pull on the lower flight 2b at the roller 3, so that the latter moves from its position 3' to the left approximately into the solid line position. Owing to the positive coupling of the rollers 3, 4 by means of the chain 19, the roller 4 is moved upwardly from its position 4' into approximately the solid line position, so that then a fresh working cycle can recommence.
  • the displacement path of roller 4 is above the plane of the table 1.
  • the maximum distance of rotation of the wheel 39 serving to control the motor 36 is determined by the displacement of the rollers 3, 4 to their respective two end positions.
  • a rotated end position of the wheel 39 may be used, in the manner explained later, for stopping the entire screen printing machine.
  • An end position of the rollers 3, 4 corresponding to this position of the wheel 39 should naturally not occur during normal operation.
  • a speed of the lower flight 2b is adjusted in accordance with the particular position of the chain 19 and hence in accordance with the position of the deflecting rollers 3, 4.
  • the speed variation of the lower flight 2b may be designed such that a slight acceleration and a slight retardation occurs, and such that the maximum speed of the continuously moved lower flight 2b is approximately half the speed of the intermittently moved upper flight.
  • the speeds of the upper and lower flights 2b and 2a may overlap, such that during the drive of the upper flight 2a, the lower flight 2b is accelerated to maximum speed; during the stoppage of the upper flight 2a, the drive of the lower flight is retarded to minimum speed, and then, on the next working cycle again, it accelerates slowly together with the rapidly accelerated movement of the upper flight 2a.
  • the latter may also be adapted to be displaced at an angle of at least 45 to the plane of table 1.
  • the direction of displacement of the roller 4 may thus be an angle of 45 90" to the plane of table 1, the advantage of the short fabric entry being retained.
  • the roller 3 may also be arranged to be displaced in a direction which is inclined to the plane of the table 1 in the same way as the roller 4.
  • a wheel 43 is mounted freely rotatable on the spindle of wheel 39.
  • the wheel 39 carries two mutually opposite pins 44, 45, and the wheel 43 has a stop 46 for these pins 44, 45 (FIG. 4).
  • the position of the wheels 39, 43 according to FIG. 4 occurs at the position of the crosspieces 38 fixed to the chain 19 according to FIGS. 1 and 2.
  • the rollers 3, 4 are situated in the solid line position according to FIG. 1, which is the end position.
  • the cross-pieces 38 in FIGS. 1, 2 have been displaced to the extreme right, and the wheel 39 has rotated the wheel 43 by means of pins 44, 45 in the anticlockwise direction to the position according to FIGURE 4.
  • the cross-pieces 38 in FIGS. 1, 2 are displaced to the left.
  • the wheel 39 can be rotated by the chain 37 in the clockwise direction to the solid line position according to FIG. 5, Without the wheel 43 being rotated.
  • the cross-pieces 38 have been displaced to the left by the distance to position 49, assumed stationary (FIGS. 2, 3), the speed n remaining zero (FIG. 3).
  • the wheel 43 is rotated by the pin 44 in the clockwise direction to the dash line position according to FIG. 5, and the speed increases linearly with increasing rotation of the wheel 43 (FIG. 3).
  • the lower flight 2b On displacement of the rollers 3, 4 through their distance s minus s to and fro, the lower flight 2b will then be moved continuously at the same speed. Owing to tolerances occurring after several repeat lengths, and owing to speed fluctuations, the reciprocating path of the rollers 3, 4 may vary somewhat. This means that the wheel 39 no longer rotates to-andfro without action on the wheel 43, but the pin 45 swings the stop 46 to position 46' (FIGURE 6). A lower speed n is now selected (FIGURE 3). The reciprocating path of the rollers 3, 4 is now s minus s (FIGURE 3). On further operation of the screen-printing machine, the speed 21 is adjusted. The speed may therefore hunt between n and n during operation.
  • Both speeds n n may lie very close to each other.
  • a change from n to n-,, and vice versa only occurs after a number of repeats of the upper flight 2a. Movement of the lower flight is thus efiected at approximately constant speed.
  • a web printing machine according to claim 2, wherein the supply roller is heated.
  • a web printing machine wherein said pull member is carried over a first deflecting wheel, coaxial with which there is provided a control wheel acting on and infinitely variable gear, and the two wheels having stops whereby the control wheel may be driven in both directions of rotation, by the first wheel in the manner of a follow-up pointer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Rotary Presses (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US579349A 1965-09-16 1966-09-14 Web printing machines Expired - Lifetime US3403622A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1288365A CH427716A (de) 1965-09-16 1965-09-16 Filmdruckmaschine

Publications (1)

Publication Number Publication Date
US3403622A true US3403622A (en) 1968-10-01

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ID=4387277

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Application Number Title Priority Date Filing Date
US579349A Expired - Lifetime US3403622A (en) 1965-09-16 1966-09-14 Web printing machines

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US (1) US3403622A (es)
AT (1) AT275458B (es)
BE (1) BE686741A (es)
CH (1) CH427716A (es)
DE (1) DE1635380B1 (es)
ES (1) ES330613A2 (es)
GB (1) GB1137967A (es)
OA (1) OA100E (es)
SE (1) SE304969B (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054091A (en) * 1976-04-05 1977-10-18 Micro-Circuits Company, Inc. Silk screen printing process and apparatus
US5386981A (en) * 1992-12-11 1995-02-07 Dainippon Ink & Chemicals, Inc. Automatic paper processing method and cut-sheet feed rotary press having automatic paper processing apparatus
US20030089731A1 (en) * 2001-10-19 2003-05-15 Monogen, Inc. Article dispensing apparatus and method
US6880695B2 (en) * 2003-07-14 2005-04-19 Heian Corporation Board processing unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3222448C2 (de) * 1982-06-15 1985-08-29 Kufner Textilwerke GmbH, 8000 München Vorrichtung zum Bedrucken von flexiblen Flächenteilen mit pastösen Massen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017706A (en) * 1935-10-15 Method of amd apparatus fob mount
US3203533A (en) * 1963-06-18 1965-08-31 Itt Distributing system for transfer of articles
US3308750A (en) * 1963-09-18 1967-03-14 Buser Ag Maschf Fritz Intermittent printing of web on conveyor belt

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017706A (en) * 1935-10-15 Method of amd apparatus fob mount
US3203533A (en) * 1963-06-18 1965-08-31 Itt Distributing system for transfer of articles
US3308750A (en) * 1963-09-18 1967-03-14 Buser Ag Maschf Fritz Intermittent printing of web on conveyor belt

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054091A (en) * 1976-04-05 1977-10-18 Micro-Circuits Company, Inc. Silk screen printing process and apparatus
US5386981A (en) * 1992-12-11 1995-02-07 Dainippon Ink & Chemicals, Inc. Automatic paper processing method and cut-sheet feed rotary press having automatic paper processing apparatus
US20030089731A1 (en) * 2001-10-19 2003-05-15 Monogen, Inc. Article dispensing apparatus and method
US6880695B2 (en) * 2003-07-14 2005-04-19 Heian Corporation Board processing unit

Also Published As

Publication number Publication date
CH427716A (de) 1967-01-15
ES330613A2 (es) 1967-08-16
BE686741A (es) 1967-02-15
AT275458B (de) 1969-10-27
SE304969B (es) 1968-10-14
DE1635380B1 (de) 1969-12-11
GB1137967A (en) 1968-12-27
OA100E (es) 1970-12-15

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