US3921520A - Ink applicator for screen printer - Google Patents

Ink applicator for screen printer Download PDF

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Publication number
US3921520A
US3921520A US364560A US36456073A US3921520A US 3921520 A US3921520 A US 3921520A US 364560 A US364560 A US 364560A US 36456073 A US36456073 A US 36456073A US 3921520 A US3921520 A US 3921520A
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US
United States
Prior art keywords
slot
ink
combination defined
foil
receptacle
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
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US364560A
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English (en)
Inventor
Peter Zimmer
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Individual
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Individual
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Publication date
Priority claimed from AT467672A external-priority patent/AT314460B/de
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Publication of US3921520A publication Critical patent/US3921520A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B41F15/44—Squeegees or doctors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • B41F15/426—Inking units comprising squeegees or doctors the squeegees or doctors being magnetically attracted

Definitions

  • ABSTRACT A downwardly open ink receptacle, surrounded by a cylindrical masking screen, has a downwardly convex bottom member of elastic material forming a discharge slot for the ink, this slot being spanned by one or more substantially inextensible reinforcing elements leaving clearances in line with the slot in order to give passage to the ink,
  • the slot may be bounded by a pair of low-friction strips bearing directly upon the inner screen surface under pressure of a pair of weighting bars flanking the slot.
  • the reinforcement can be a perforated foil, an insert with an undulating wire, or a series of axially spaced bolts.
  • FIG. 1 A first figure.
  • My present invention relates to a dyestuff applicator for a printing machine of the type wherein a perforated cylindrical screen is rotatable about a horizontal axis and surrounds a housing forming an axially extending gap just above the nadir of the screen for the controlled discharge of printing liquid (referred to hereinafter as ink) through the perforations of the screen onto a substrate for imprinting the latter in accordance with a predetermined pattern.
  • ink printing liquid
  • the object of my present invention is to provide means for stabilizing the gap width while effectively preventing outward leakage of the printing liquid from the region of the gap onto adjoining portions of the inner screen surface.
  • a receptacle for the printing liquid with a cylindrically curved downwardly convey bottom member of elastic material forming a discharge slot or gap parallel to the cylinder axis, the underside of this bottom member being closely spaced from the surrounding apertured masking screen, and securing substantially inextensible reinforcing means to that bottom member, the reinforcing means spanning the discharge slot for preventing its enlargement while leaving clearances for the passage of printing liquid from the receptacle through that slot.
  • FIGS. 1 and 2 are cross-sectional views, taken respectively on the lines I I and II II of FIG. 5, of an ink applicator embodying my present invention
  • FIG. 3 is a plan view of a perforated reinforcing foil partially closing a discharge slot at the bottom of the applicator housing of FIGS. 1 and 2;
  • FIG. 3a is a'fragmentary cross-sectional view drawn to a-large scale and showing details of the foil of FIG.
  • FIG. 4 is a side-elevational view of the applicator of FIGS. 1 and 2; l
  • FIG. 5 is a view similar to FIG. 4, drawn to a larger scale and with parts broken away;
  • FIG. 6 is a top view of the right-hand end of the applicator, drawn to a still larger scale
  • FIG. 7 is a cross-sectional view of another applicator according to my invention.
  • FIG. 8 is a view similar to FIG. 7, illustrating a modification
  • FIG. 9 is a further cross-sectional view illustrating, somewhat schematically, an alternate embodiment
  • FIGS. 10 and 11 are plan views similar to FIG. 3, showing modified reinforcements for the bottom of the applicator;
  • FIGS. 12 14 are fragmentary cross-sectional views of the applicator bottom, illustrating further modifications.
  • FIGS. 1 and 2 I have shown a printing-ink applicator according to my present invention whose housing 1 is reinforced by two profiled tubes 2 to minimize deformation of the lateral housing walls 3 as a result of the static pressure of the printing liquid or ink within the housing.
  • the ink flows through a supply tube 5 and openings 6 into the applicator housing.
  • FIG. 1 the ink-supply openings 6 are shown overlain by ports 7 in the housing 1 which are covered by strips 8. If necessary, the clogged ink openings 6 can be cleaned through the ports 7.
  • a screw 9 opens a throttled passage through a vent hole 10 during the entire operation of the applicator, the hole 10 having a diameter of about 4 mm.
  • round bars 15 of magnetizable material are disposed on the elastic plate 13 and are held in a predetermined relative position by straps 16 having recesses 17.
  • the nickel foil 14 and the plate 13 are fastened by screws 19 to the bottom of housing 1.
  • the housing 1 is furthermore so stiffened by the straps 16 and reinforcing segments 20 that it cannot be deformed.
  • An intermediate region between straps 16 and segments 20 is unobstructed so that a free flow of the ink in the longitudinal direction of the applicator housing is facilitated.
  • the illustrated mounting of plate 13 and foil 14 permits a tight, resilient application of the nickel foil 14 to the screen 11.
  • this foil 14 could also be made of some other material, as for instance a sheet of tombak, copperberyllium bronze, or the like.
  • the round bars 15 are pressed against the stack formed by plate 13, foil 14 and screen 11 by an electromagnet 22 located below the screen 11.
  • the contact pressure of the foil 14 against the screen 11 and thus the lateral sealing of a discharge gap 27, flanked by the bars 17, is thus jointly produced by the natural elasticity of the resilient metal foil 14 and the rubber plate 13, by the weight of the bars 17 supplemented by the magnetic force, and by the hydrostatic pressure of the ink within the housing.
  • Gap 27 allows the ink to pass through pattern-forming apertures in masking screen 11 to an underlying substrate to be imprinted.
  • the ink-emitting holes 6 located near the ends of screen 11, one of which is visible in FIG. 2, are controlled by associated throttle screws 23. These holes 6 can be opened by a slight turning of the screws 23 which, as -will be explained later on in connection with FIG. 3, serve to regulate the outflow of the printing ink.
  • the nickel foil 14 has coarse perforations 25 in the region of the discharge gap 27, which is narrower than the contact area 12. These perforations are preferably produced by punching, the nickel foil 14 being so mounted that the deformation or burr 24 due to the punching of the holes 25 faces upwardly, as shown in FIG. 3a. This prevents the clipping of small hairs of the substrate to be imprinted which extend through the perforations 25 into the rotating screen 11 and which, when cut, would dirty the inner wall surface of the screen.
  • Foil 14, spanning the gap 27 defined by the downwardly convex bottom member 13 of the applicator housing 1, serves as a substantially inextensible reinforcing means which prevents the gap from spreading.
  • the screen 11 is shown provided at opposite ends with heads 28 which are placed in rotation by means of gears 29 and 30.
  • the driving torque comes from a power shaft (not shown) within gear boxes 31.
  • the left end 32 of the ink tube 5, journaled in a bearing 33, is accessible for cleaning upon removal of a plug 34.
  • the right end 35 has an elbow 36 with threads 37 for attachment to a feed line not shown.
  • the ink openings 6 are arranged in the center of the housing 7 within a narrow .region 39, so that identical flow paths are present for the ink at opposite ends 40 of the housing.
  • the rubber plate 13 is fastened to flanges 41 at the housing ends 40 by means of strips 42 and screws 43.
  • throttle screws 23 are disposed in the end regions of the applicator housing 1 so that any drop of pressure in either of these regions can be counteracted by slightly retracting these screws 23 to increase the controlled flow of the ink toward that end of tube 5.
  • FIG. 6 is a plan view of the right-hand end 40 of the housing, showing the vent hole formed in a nipple 44 which is screwed into that end of the housing 1.
  • a tubular connection 45 links the nipple 44 with a thin guide hose 46 which returns the ink emerging from the throttled vent hole 10 together with any entrained air to the ink reservoir.
  • printing ink is supplied via the interior 102 of a tube 101 under a hydrostatic pressure which is produced by a pressure accumulator, an elevated ink container, a pump or the like, located outisde of a surrounding printing screen 103.
  • the ink passes via apertures 104 of supply tube 101 into bores 105 of an elastic base 106 consisting, for instance, of rubber.
  • This base 106 forming part of a downwardly convex bottom member, is held by guides 107 and 108 to the ink tube 101 serving as a liquid receptacle.
  • the guide 108 is constructed as a lateral reinforcement preventing excessive bending of the base 106 in the direction of the arrow 109, i.e.
  • the gap 115 is a slot bounded by two edges 116 and 117 of a pair of low-friction strips 136, 137 (see also FIG. 8) which are held together by reinforcing bolts 118 disposed thereabove.
  • These bolts are of relativelysmall diameter and have heads 119 which, through the intermediary of a washer 120, bears upon the right-hand side of the inverted-U-shaped lower part of base 106 while a nut 121, acting through another washer 122, engages the left-hand side of that part.
  • the bolts 118 are received in spacing sleeves 124 which keep the two walls of that channel a predetermined distance apart.
  • the bolts 118 and their spacing sleeves 124 are advantageously made of an acid-resistant, stainless high-grade steel. However, they can also be made of a relatively nonextensible, thermoplastic or thermosetting resinj for example, polyamide or polyacetal is well suited for this purpose.
  • the flexible base 106 of this embodiment is limitedly movable in vertical direction with respect to the ink tube 101.
  • the conduits 105 of FIG. 7 hav'ebeen replaced by aligned nipples 126 and interconnected by a length of corrugated and therefore flexible tube 127 which may consist of rubber, high-grade steel or plastic defining a fluidtight feed channel between the ink tube 101 and the base 106.
  • Brackets 128 and 131 articulated to each other by a link 129 and pivot'pins 130, hold the base 106 in place upon rotation of the screen in the counterclockwise direction indicated by the arrow 110.
  • the nipples 126 are fastened to the base 106 by means of a cover strip 132 which has flexural elasticity.
  • the rubber body 133 of the base 106 can be bonded to the covering strip 132 by vulcanization or cementing.
  • the base 106 In its lower region the base 106 has a nonextensible reinforcing foil 134 provided with a perforated zone 135 at its center.
  • This foil can be a'strip of, for instance, galvanized or noble sheet metal or of a substantially nonextensible plastic material in which the holes 135 are produced by punching.
  • This foil 134 is fastened to the rubber body 133 by bonding or vulcanization.
  • Bonded to the underside of sheet 134 are the two aforementioned low-friction strips 136 and 137 whose separation defines the width 123 of the slot 115, the foil 134 being sandwiched between thesestrips-and the arms of the inverted *U" formed by base 133.
  • the two slot edges 116 and 117 are in this case held apart by the foil 134 at an invariable distanceso that the slot width 123 cannot be changed by the frictional forces occurring between the rotating screen 103 and the slide coverings 136 and 137.
  • Pressure tests carried out with such devices have established a remarkable uniformity of the depth of color and penetration of the substrate printed in this manner.
  • the perforations 135, if suitably distributed, do not impair that uniformity, particularly if the discharge gap 115 is disposed below them.
  • FIG. 9 shows another embodiment in which a fluidtight container 138 is filled with printing liquid via inkinlet openings 139 provided at its ends.
  • the container 138 In its lower region the container 138 is closed by an elastically flexible sheet 140 preventing the outflow of liquid from this container downward through the screen 103 into a region other than that of the slot 1 15.
  • the sheet 140 preferably consists of a synthetic rubber so as to be yieldable in vertical direction in case of unevenness of the substrate.
  • This elastic sheet material also causes a certain extensibility in tangential direction tending to change the width of the discharge slot 115 by reason of the unavoidable frictional forces between the screen 103 and the slide coverings 136 and 137, cemented onto the foil 140, the slot 115 registering with a continuous slit 141 formed in that foil.
  • the undulating wire insert 142 is so arranged, as best seen in FIG. 10, that its individual turns point in the direction of rotation of the screen.
  • FIG. 11 shows an alternate arrangement wherein the reinforcement 142 has been replaced by a perforated metal strip 144 fastened at the same place as the wire insert 142 to the foil 140, again with the aid of a polymer or vulcanizate 143.
  • the metal strip 144 is provided in its lateral regions with oblong perforations 145.
  • the diameter 147 of each individual hole 146 of the perforated central strip zone bears a predetermined ratio to the center-tocenter distance 148 between these holes.
  • That ratio advantageously has the approximate value of 1:2 cos 30 3
  • the center points of the holes then neatly fill a network of lines of a hexagonal raster. If the physical webs remaining between the holes are not larger than to percent of the hole diameter, very uniform ink-passage conditions result.
  • the elastic foil 140 is fastened tightly to the container edges 149 between clamping strips 150 and flanges 151.
  • FIG. 12 shows another modification wherein the elastic foil 140 is urged by the ink pressure or other means against a thin metal diaphragm 152, located below it, which has a perforated zone 135 approximately conforming to the patternof holes 146 shown in FIG. 11.
  • This metal diaphragm l 52 bears the two slide strips 136 and 137 which assure low-friction contact between the screen 103 and the, convex bottom of the applicator and which again form an ink-distribution channel here very narrow in the region of the slot 115.
  • This ink-distribution channel is, however, entirely sufficient, with a very small mesh size of the perforations 135, to distribute the printing ink uniformly.
  • FIG. 13 shows that it is also possible to provide the perforated zone 135, located between the two slot edges 116 and 117, in the foil itself. With this arrangement, also, very good results can be obtained although the uniformity of color is not as high as in the case of a diaphragm of metal or thermosetting plastic bridging the two slot edges 116 and 117 as shown in FIG. 12.
  • FIG. 14 finally, shows an embodiment in which the elastic foil 140 is provided with a single low-friction strip 153 provided with the perforated zone 135.
  • the strip 153 generally consists of a readily slidable but not very extensible material which has a certain flexibility only by virtue of its small thickness, a quite satisfactory connection of the two slot edges 116 and 117 is assured; upon prolonged operation, however, a certain impairment occurs since the slide covering 153, of course, wears so that the reinforcement spanning the two edges 116 and 117 becomes weaker while the effective stresses remain the same. Eventually, there is reached a condition of wear in which the remaining thickness 154 of the slide covering 153 is no longer sufficient to withstand the frictional forces.
  • the present invention is not limited to the embodiments described and illustrated.
  • the variants shown in FIGS. 12 to 14 can be used also in connection with the types of applicator shown in FIGS. 7 and 8.
  • the foil 140 is then replaced by the rubber body 133 of the base 106.
  • Another possibility of keeping the slot width constant consists in providing slits interrupted at intervals by webs either in a covering sheet or else in the bodies 106 and 133.
  • the bottom member defining the discharge gap can be integral with the webs in that case.
  • a grate could be disposed both inside and outside the outlet proper.
  • the entire applicator can be swung around the axis of the ink tube, preferably by when the machine is stopped so that the substrate is not dirtied and the ink can be practically completely drained from the applicator housing.
  • a receptacle for printing liquid provided with a cylindrically curved, downwardUy convex bottom member of elastic material forming a discharge slot for said liquid parallel to the cylinder axis;
  • substantially inextensible reinforcing means secured to said bottom member and spanning said slot for preventing its enlargment, said reinforcing means leaving clearances for the passage of said liquid from said receptacle through said slot.
  • reinforcing means comprises a flexible perforated foil overlying said slot.
  • said receptacle has a generally cylindrical body and said member forms a base underlying said body with freedom of limited relative motion,'said base being provided with conduit means for supplying said printing liquid, said conduit means extending from said slot to the interior of said body.
  • said reinforcing means comprises a flexible perforated foil secured to said arms, said member further including a pair of low-friction strips underlying said arms with confronting edges bounding said slot.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Coating Apparatus (AREA)
US364560A 1972-05-30 1973-05-29 Ink applicator for screen printer Expired - Lifetime US3921520A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT467672A AT314460B (de) 1972-05-30 1972-05-30 Rakeleinrichtung an Filmdruckmaschinen
AT150973 1973-02-21

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US3921520A true US3921520A (en) 1975-11-25

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ID=25596039

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US364560A Expired - Lifetime US3921520A (en) 1972-05-30 1973-05-29 Ink applicator for screen printer

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US (1) US3921520A (enrdf_load_stackoverflow)
CH (1) CH552471A (enrdf_load_stackoverflow)
FR (1) FR2186356B1 (enrdf_load_stackoverflow)
GB (1) GB1420460A (enrdf_load_stackoverflow)
IT (1) IT991593B (enrdf_load_stackoverflow)
NL (1) NL154155B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965817A (en) * 1973-04-03 1976-06-29 Zeki Ipek Closed squeegee applicator with flexible sides
US3994220A (en) * 1973-02-26 1976-11-30 Stork Amsterdam B.V. Pressurized squeegee with stiff resilient sealing strips
US4023486A (en) * 1974-08-01 1977-05-17 E.T. Barwick Industries Screen printing squeegee apparatus
US4082036A (en) * 1975-04-03 1978-04-04 Mitter & Co. Ink trough dividers for endless band screen printer
US4307662A (en) * 1976-09-25 1981-12-29 Mathias Mitter Apparatus for printing on webs
US4526098A (en) * 1977-02-22 1985-07-02 Dl Process Co. Laser formed rotary print plate with internal sintered titanium ink reservoir
US4665723A (en) * 1983-10-07 1987-05-19 Johannes Zimmer Nozzle assembly for applying liquid to a moving web
US5925187A (en) * 1996-02-08 1999-07-20 Speedline Technologies, Inc. Apparatus for dispensing flowable material
US5947022A (en) * 1997-11-07 1999-09-07 Speedline Technologies, Inc. Apparatus for dispensing material in a printer
US6324973B2 (en) 1997-11-07 2001-12-04 Speedline Technologies, Inc. Method and apparatus for dispensing material in a printer
US6453810B1 (en) 1997-11-07 2002-09-24 Speedline Technologies, Inc. Method and apparatus for dispensing material in a printer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US846645A (en) * 1906-11-03 1907-03-12 Asa P Brooks Auxiliary printing attachment for cylinder printing-presses.
US1541787A (en) * 1923-12-29 1925-06-16 Cadgene Ernest Method and apparatus for printing textile fabrics
US2445666A (en) * 1945-05-04 1948-07-20 Ellam Frederick Inking device for rotary duplicating machines
US2697397A (en) * 1949-07-21 1954-12-21 Milo Harding Company Rotary printing drum for duplicating machines
US3752071A (en) * 1972-05-15 1973-08-14 Weber Marking Systems Inc Handprinter construction
US3799053A (en) * 1972-07-13 1974-03-26 Marsh Stencil Machine Co Hand printer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2114174A1 (de) * 1971-03-24 1972-10-05 Murswiek Dagmar Zips Geb Siebdruckrakel,farbgefuellt

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US846645A (en) * 1906-11-03 1907-03-12 Asa P Brooks Auxiliary printing attachment for cylinder printing-presses.
US1541787A (en) * 1923-12-29 1925-06-16 Cadgene Ernest Method and apparatus for printing textile fabrics
US2445666A (en) * 1945-05-04 1948-07-20 Ellam Frederick Inking device for rotary duplicating machines
US2697397A (en) * 1949-07-21 1954-12-21 Milo Harding Company Rotary printing drum for duplicating machines
US3752071A (en) * 1972-05-15 1973-08-14 Weber Marking Systems Inc Handprinter construction
US3799053A (en) * 1972-07-13 1974-03-26 Marsh Stencil Machine Co Hand printer

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994220A (en) * 1973-02-26 1976-11-30 Stork Amsterdam B.V. Pressurized squeegee with stiff resilient sealing strips
US3965817A (en) * 1973-04-03 1976-06-29 Zeki Ipek Closed squeegee applicator with flexible sides
US4023486A (en) * 1974-08-01 1977-05-17 E.T. Barwick Industries Screen printing squeegee apparatus
US4082036A (en) * 1975-04-03 1978-04-04 Mitter & Co. Ink trough dividers for endless band screen printer
US4307662A (en) * 1976-09-25 1981-12-29 Mathias Mitter Apparatus for printing on webs
US4526098A (en) * 1977-02-22 1985-07-02 Dl Process Co. Laser formed rotary print plate with internal sintered titanium ink reservoir
US4665723A (en) * 1983-10-07 1987-05-19 Johannes Zimmer Nozzle assembly for applying liquid to a moving web
US5925187A (en) * 1996-02-08 1999-07-20 Speedline Technologies, Inc. Apparatus for dispensing flowable material
US5947022A (en) * 1997-11-07 1999-09-07 Speedline Technologies, Inc. Apparatus for dispensing material in a printer
US6324973B2 (en) 1997-11-07 2001-12-04 Speedline Technologies, Inc. Method and apparatus for dispensing material in a printer
US6453810B1 (en) 1997-11-07 2002-09-24 Speedline Technologies, Inc. Method and apparatus for dispensing material in a printer
US6626097B2 (en) 1997-11-07 2003-09-30 Speedline Technologies, Inc. Apparatus for dispensing material in a printer

Also Published As

Publication number Publication date
DE2365563B2 (de) 1976-09-09
FR2186356A1 (enrdf_load_stackoverflow) 1974-01-11
DE2322756B2 (de) 1975-07-17
FR2186356B1 (enrdf_load_stackoverflow) 1978-05-26
NL7307441A (enrdf_load_stackoverflow) 1973-12-04
DE2365563A1 (de) 1975-09-18
NL154155B (nl) 1977-08-15
GB1420460A (en) 1976-01-07
CH552471A (de) 1974-08-15
DE2322756A1 (de) 1973-12-13
IT991593B (it) 1975-08-30

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