US3809009A - Device for applying a layer of adhesive on an endless belt in a screen printing machine - Google Patents

Device for applying a layer of adhesive on an endless belt in a screen printing machine Download PDF

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US3809009A
US3809009A US23713972A US3809009A US 3809009 A US3809009 A US 3809009A US 23713972 A US23713972 A US 23713972A US 3809009 A US3809009 A US 3809009A
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Prior art keywords
belt
adhesive
coating roll
supporting
roll
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G Stierlein
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ALSACIENNE CONSTR MECA
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ALSACIENNE CONSTR MECA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F15/00Screen printers
    • B41F15/14Details
    • B41F15/16Printing tables
    • B41F15/18Supports for workpieces
    • B41F15/24Supports for workpieces for webs

Abstract

In screen printing machines, in the vicinity to the belt adapted to carry the strip material to be printed, there are provided belt adjustable guiding means for deforming the belt so that its cross-section exhibits a configuration having a central portion of variable width, slightly protruding relative to the two remaining marginal portions, whereby the coating roll bears only against said belt central portion.

Description

United States Patent [1 1 [111 3,809,009 Gerard 1 May 7, 1974 [54] DEVICE FOR APPLYING A LAYER OF 2,054,822 9/1936 Keith 12/80 A H ON A ENDLESS BELT [N A 807,685 l2/l905 Pelham 118/257 X 3,627,557 12/1971 Sato et a1 117/37 LE SCREEN PRINTING MACHINE 2,606,520 8/1952 Hoel 118/249 [75] Inventor: Stierlein Gerard, 1,399,975 12/1921 McConnell 118/257 Mulhouse-Bourtzwiner France Kaneko 6t 31 3,310,304 3/1967 Foias et a1. 101/232 X [73] Assignee: Societe Alsacienne de Constructions 2 55,3 10/1953 Geiringer Mecaniques de Mulhouse, 2,406,056 8/1946 Barrett 118/262 Mulhouse, France [22] Filed: 1972 Primary Examiner-Morris Kaplan [21] Appl. No.: 237,139 Attorney, Agent, or Firm1-lolman & Stern Foreign Application Priority Data Apr. 1, 1971 France 71.11467 [57] ABSTRACT Cl In screen printing machines, in the vicinity to the belt 6/247 adapted to carry the strip material to be printed, there [51] Int. Cl. 1. B056 11/00 are provided belt adjustable guiding means for de- Field of Search 118/44, 0, forming the belt so that its cross-section exhibits a 1 18/262, 2 111 B, 1 11 configuration having a central portion of variable 5 /547, 549 width, slightly protruding relative to the two remaining marginal portions, whereby the coating roll bears only [5 6] References Cited against said belt central portion.

UNITED STATES PATENTS 1,618,809 2/1927 Byron et a1. 1 17/44 UX 6 Claims, 4 Drawing Figures mminm H974 3809.009

sum 1 [IF 2 DEVICE FOR APPLYING A LAYER OF ADHESIVE ON AN ENDLESS BELT IN A SCREEN PRINTING MACHINE BACKGROUND OF THE INVENTION The invention relates to a device for applying a layer of adhesive on an endless belt adapted to support a strip to be printed in a screen printing machine. It relates more particularly to rotary cylindrical screen machines but it is also applicable to frame or flat screen printing machines.

In such machines, the material to be printed, generally a piece of fabric, is temporarily fixed on the endless belt which will transport the material during the printing operation, by applying on said belt, upwardly of the screen area, a layer of a suitable adhesive through a set of rolls successively engaging with each other and the first of which rolls, or the supplying roll, is immersed in a tank filled with adhesive, while the last roll, or coating roll, is in contact with the belt. The adhesiveness of the adhesive substance utilized is sufficiently weak for the fabric to be easily stripped off the belt under the mere effect of the tension imparted thereto by taking-up means at the delivery end of the machine.

PRIOR ART It is useless and even harmful for the belt to be covered with adhesive over the whole width thereof, particularly in cases in which a fabric of a width substantially smaller than the width of the belt is to be printed. This is why the machines of this type are generally provided with a device enabling adjustment of the width over which the belt is covered with an adhesive. However, the known devices utilize means which directly act upon the width of the rolls which apply the adhesive on the belt, and/or upon the width of the rolls which are immersed in the adhesive tank, often provided themselves with displaceable side partitions; such devices are relatively complicated, their tightness is not always satisfactory and their operation is rather difficult.

OBJECT AND SUMMARY OF THE INVENTION Therefore, an object of the invention is to provide a width adjustable adhesive laying device for belts of printing machines, which obviates the abovementioned defects of the known devices.

For this purpose, according to the present invention, adjacent the coating roll, there are provided adjustable belt guiding means capable of deforming said belt so that the belt can assume a configuration whose crosssection has a central portion of variable width which slightly protrudes on the outer face relative to the two remaining marginal portions thereof, whereby the coating roll engages only the central portion of said belt.

Due to this particular structure, all of the parts of the adhesive laying system including the tank, the supplying roll, the coating roll and the intermediary laminating roll or rolls are of unvariable characteristics, irrespective of the width to which the band must be covered with adhesive. Only the belt portion to be coated with adhesive, i.e., the portion which slightly protrudes with respect to the marginal portions thereof, may be reached by the coating roll, so that the two portions of said roll which are situated beyond the width of the belt to be treated although also coated with adhesive, remain inoperative and cannot apply adhesive onto the belt since they are not in contact with the marginal portions thereof.

According to a preferred embodiment of the invention, the coating roll is carried by a shaft which also carries two supporting rollers, having a diameter slightly larger than that of said coating roll, at both ends thereof, for supporting said marginal portions of the belt. Said two supporting rollers act to prevent the marginal portions of the belt lifted by said adjustable guiding means, from lowering and producing deformations which could entail irregularities across the width of the coated portion of the belt.

In one particular embodiment, said adjustable guiding means comprise two rotary adjusting rollers which support, respectively, the two marginal portions of the outer surface of the lower run of the endless belt, with said two rollers being idly mounted on two aligned shafts, while adjusting control means permit the vary ing of the spacing of said two rollers.

The invention will be more clearly understood from the following description with reference to the accompanying drawings, which represent, by way of example only, one embodiment of an adhesive laying device for the endless belt of a rotary screen printing machine according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings FIG. 1 is a diagrammatic side view of the device, in an operative condition,

FIG. 2 is a cross section taken on line II-II of FIG. 1, the view looking in the direction of the arrows,

FIG. 3 is a cross section, taken on line IlIIII of FIG. 1, and

FIG. 4 is a view similar to FIG. 1, but showing the device at rest, in inoperative position.

DETAILED DESCRIPTION OF THE INVENTION The device shown in FIG. 1 is intended to apply a layer of adhesive on an endless belt 1 ofa rotary screen printing machine, with said adhesive laying being effectively made only on a central portion of width L (see also FIG. 3) of the belt.

An adhesive 3 contained in a tank 4 is transferred to the belt 1 by a set of rolls, three in the present embodiment, which comprises a first roll or supplying roll 5, immersed in the adhesive contained in the tank, an intermediary roll or laminating roll 6 in contact with the supplying roll 5 and a coating roll 7 which, when the device is an operative position as shown in FIG. 1, is simultaneously in contact with the laminating roll 6 and with the lower face or outer face of the lower run of the endless belt 1, in proximity to an end drum 8 around which the belt flexes.

The assembly consisting of the tank 4, the supplying roll 5 and the laminating roll 6 is carried by a support 11 which may slide horizontally on slide-bars 12, in such a way that the laminating roll 6 may move towards or away from the coating roll 7, as can be seen by comparing FIGS. 1 and 4. Bearings 14 of the supplying roll 5 and bearings 15 of the laminating roll 6 are slidingly mounted in inclined slide-bars 16, the direction of which is substantially radial relative to the coating roll 7. The bearings 14 are connected respectively to piston rods 18 of two pressure fluid rams 19, cylinders 22 of which are secured the support 11 on each side of the machine. Rams l9 permit the supplying roll 5 to be applied against the laminating roll 6 and, therefore, the latter to be applied against the coating roll 7 with a suitable pressure according to the quantity of adhesive which it is desired to apply to the printing belt 1.

The ends of a shaft 25 of the coating roll 7 are journaled in the ends of two arms 26, the other ends of which are fixedly secured to two shafts 28 rotatably mounted in brackets 29 secured to a frame 9 of the machine, on each side thereof. By pivoting the arms 26, the coating roll 7 may be brought against the belt 1, as shown in FIG. 1, or, on the contrary, said coating roll 7 may be moved away therefrom, as shown in FIG. 4. This displacement is achieved, in the present embodiment, by means of two further pressure fluid rams 32, cylinders 33 of which are pivoted, through pins 34 on brackets 35 secured to the frame 9 of the machine, while rods 37 of the pistons of said rams are pivotally mounted at their ends, on ends 38 of levers 39 which are extensions of arms 26.

The adhesive laying width on the belt may be adjusted as desired by means of belt adjustable guiding means which, in the present embodiment, are in the form of two rotating rollers 44, 44A of variable spacing. Each of said rollers, e.g., roller 44, is idly rotatably mounted, for example, through two ball bearings or the like 45, 46, on a nut member 47 engaged on a horizontal screw threaded bar 48 which is journaled at its two ends in two bearings 51, 52 secured to a cross-beam 54 of the machine frame 9. The nut member 47 is provided with a depending flange 55, the edge of which has a rectilinear portion in sliding engagement with the cross-beam 54, so that said nut member may slide on said crossbeam without rotating on itself. The screw threaded bar 48 may be rotated, for example, by means of a manual adjusting control wheel 57 secured to one end of said bar.

Roller 44A is mounted in the same manner as roller 44 and the corresponding parts have been designated by the same reference numerals bearing the suffix A. Thus, by rotating the two screw threaded bars 48, 48A in a given direction or in the reverse direction, through manual control wheels 57, 57A, the two rollers 44, 44A may be displaced as desired towards or away from each other, according to the width L of the portion of the belt which is tobe coated with adhesive. Moreover, the individual positioning adjustment of the two rollers permits, if necessary, to lay adhesive on a portion of the endless belt which is not necessarily centered with respect to the over-all width of said belt.

The diameter and the vertical positioning of the two rollers 44, 44A are such that said rollers slightly lift the corresponding marginal portions of the belt 1 above the level normally reached by the lower run of said belt in proximity to the driving drum 8 thereof. Moreover, slightly upwardly of the two adjusting rollers 44, 44A, there is provided a guiding roll 61 of even diameter throughout its length and against which bears the upper or inner face of the lower run of the belt I. Said guiding roll is provided for enabling the rollers 44, 44A to achieve, with a better accuracy, the particular configuration of the belt cross-section shown in FlG. 2, since the central portion of the belt to be coated is maintained by said roll, and by the driving drum 8 respectively, immediately upwardly and downwardly of the area of the two adjusting rollers 44,44A and the coating roll 7.

The shaft 25 of the coating roll 7 carries at both ends thereof two supporting rollers 63, 63A (FIG. 3), the diameter of which is slightly larger than that of said coating roll, so that when the deformed central portion of the belt bears upon the coating roll 7, the slightly lifted marginal portions of said belt naturally bear upon said two supporting rollers 63, 63A thus, the latter contribute to accurately maintain the configuration of the cross-section of the belt imparted thereto by the two adjusting rollers 44, 44A.

The coating roll 7 is rotatably driven by shaft 10 of the belt driving drum 8 through a gear drive which comprises a toothed wheel 71 secured to the shaft 10, a chain 72 which passes around said wheel and around another toothed wheel 73 idly mounted on one of shafts 28, a gear 74 fixedly secured to the toothed wheel 73 and a gear 75 in mesh with gear 74 and fixedly secured to shaft 25 of the coating roll 7 (FIGS. 1 and 3).

When the machine is stopped, and the adhesive laying device is in an inoperative position, the coating roll 7 occupies its lowermost position (FIG. 4) in which it is spaced from the belt and the support 1 1 is sufficiently remote for the laminating roll 6 not to be in contact with said coating roll 7.

Prior to starting the adhesive laying device, the spacing of the two rollers 44, 44A is adjusted according to the width L of the belt which is to be coated. The coating roll 7 is lifted against the belt by the rams 32, as shown in FIG. 1, and the sliding support 11 is advanced until the laminating roll 6 is in contact with the coating roll 7. The thickness of the adhesive layer to be applied to the belt 1 is adjusted by varying the pressure of the fluid admitted in the rams 19 which push the laminating roll 6 against the coating roll 7. The coating roll 7 is rotatably driven at the same peripheral speed as that of the belt 1 due to th particular characteristics given for this purpose to the chain and gear transmission (72, 71 73, 74, 75) connecting the shaft of the belt driving drum 8 to the coating roll shaft 25.

While only one embodiment of the invention has been shown and described, it is to be understood that modifications can be made without departing from the scope of the appended claims.

I claim:

1. In and for a web material processing machine having a flexible supporting band. with an inner inactive face and an outer face adapted to receive the web material, a device for laying adhesive on said outer face of the supporting band for retaining the web material, said I device comprising a set of rolls successively in contact with each other, a tank containing an adhesive, a first of said rolls being a supply roll immersed in the adhesive of said tank, a last of said rolls being a coating roll in contact with said outer face of the supporting band and a pair of guiding means located in the vicinity of the coating roll for supporting a portion of the width of the supporting band some distance away from the surface of the remaining portion of the supporting band, means adjustably mounting said pair of guiding means for movement toward or away from each other for varying the width of said portion of the supporting band, a shaft carrying said coating roll, two supporting rollers carried by said shaft, and said supporting rollers having a diameter slightly larger than the diameter of said coating roll for supporting said portion of said supporting band, whereby said coating roll bears only on said remaining portion of variable width of said supporting band.

2. In and for a web material processing machine having an endless belt forming upper and lower runs with an innerface and an outer face adapted to receive the web material, a device for laying adhesive on the outer face of the lower run of the belt for retaining the web material, said device comprising a set of rolls successively in contact with each other, a tank containing an adhesive, a first of said rolls being a supplying roll immersed in the adhesive of the tank, a last of said rolls being a coating roll in contact with the outer face of said lower run of the endless belt, a pair of guiding means located in the vicinity of the coating roll for supporting the marginal portions of said belt at a level slightly higher than the level of the unsupported central portion of said belt, means adjustably mounting said guiding means for movement toward and away from each other for varying the width of the unsupported central portion of the belt, a shaft carrying said coating roll, two supporting rollers carried by said shaft, and said supporting rollers having a diameter slightly larger than the diameter of said coating roll for supporting said marginal portions of said belt, whereby said coating roll bears only on said belt central portion of variable width. x

3. The adhesive laying device according to claim 2, wherein said adjustable guiding means consists of two adjusting rotative rollers located respectively under said marginal portions of the outer face of the lower run of said belt, said device further comprising two shafts which are aligned transversely of said belt, said rollers being idly mounted on said aligned shafts, and adjusting controlmeans for varying the spacing of said rollers.

4. The adhesive/laying device according to claim 3, wherein said shaft which carries each adjusting roller consists of a screw threaded bar, said device comprising for each of said screw threaded bars two fixed bearings and an adjusting control member for adjustment by rotation of said bar in said bearings, each of said screw threaded bars carrying a nut member, each nut member being provided with means for preventing its rotation relative to said bearings, and said adjusting rollers being idly rotatably mounted on said nut members.

5. The adhesive laying device according to claim 2, wherein a guiding roll of even diameter along its whole length is disposed against the inner face of the lower run of said endless belt, in the proximity of the belt adjustable guiding means.

6. In and for a screen printing machine having an endless belt with an outer face and an inner face adapted to receive a sheet material to be printed, and a driving rotary drum around which said endless belt flexes, said belt extending horizontally and having an upper run and a lower run; an adhesive laying device according to claim 2, wherein said coating roll is connected to said driving drum of said belt through a desmodromic transmission, whereby the peripheral spaced of said coating roll is equal to the linear speed of said belt.

UNITED STATES PATENT FFICE CERTIFICATE OF CORRECTION Patent No. 3809009 Dated May 7, 1974 nv Gerard Stierlein It is certified that error appears in the aboveidentified patent and that said Letters Patent are hereby corrected as shown below:

[751 Inventors GERARD STIERLEIN Signed and sealed this 17th day of December 1974.

(QT-TALL) Attest: I v

B- cCOY M. GIBSON, JR. MARSHALL DANN Attesting Officer Commissioner of Patents POIO50 (10-69) USCOMM-DC 60376-P69 US GOVERNMENT PRINTING OFFlCE "I9 0-I!6i-3ll.

Claims (6)

1. In and for a web material processing machine having a flexible supporting band with an inner inactive face and an outer face adapted to receive the web material, a device for laying adhesive on said outer face of the supporting band for retaining the web material, said device comprising a set of rolls successively in contact with each other, a tank containing an adhesive, a first of said rolls being a supply roll immersed in the adhesive of said tank, a last of said rolls being a coating roll in contact with said outer face of the supporting band and a pair of guiding means located in the vicinity of the coating roll for supporting a portion of the width of the supporting band some distance away from the surface of the remaining portion of the supporting band, means adjustably mounting said pair of guiding means for movement toward or away from each other for varying the width of said portion of the supporting band, a shaft carrying said coating roll, two supporting rollers carried by said shaft, and said supporting rollers having a diameter slightly larger than the diameter of said coating roll for supporting said portion of said supporting band, whereby said coating roll bears only on said remaining portion of variable width of said supporting band.
2. In and for a web material processing machine having an endless belt forming upper and lower runs with an innerface and an outer face adapted to receive the web material, a device for laying adhesive on the outer face of the lower run of the belt for retaining the web material, said device comprising a set of rolls successively in contact with each other, a tank containing an adhesive, a first of said rolls being a supplying roll immersed in the adhesive of the tank, a last of said rolls being a coating roll in contact with the outer face of said lower run of the endless belt, a pair of guiding means located in the vicinity of the coating roll for supporting the marginal portions of said belt at a level slightly higher than the level of the unsupported central portion of said belt, means adjustably mounting said guiding means for movement toward and away from each other for varying the width of the unsupported central portion of the belt, a shaft carrying said coating roll, two supporting rollers carried by said shaft, and said supporting rollers having a diameter slightly larger than the diameter of said coating roll for supporting said marginal portions of said belt, whereby said Coating roll bears only on said belt central portion of variable width.
3. The adhesive laying device according to claim 2, wherein said adjustable guiding means consists of two adjusting rotative rollers located respectively under said marginal portions of the outer face of the lower run of said belt, said device further comprising two shafts which are aligned transversely of said belt, said rollers being idly mounted on said aligned shafts, and adjusting control means for varying the spacing of said rollers.
4. The adhesive/laying device according to claim 3, wherein said shaft which carries each adjusting roller consists of a screw threaded bar, said device comprising for each of said screw threaded bars two fixed bearings and an adjusting control member for adjustment by rotation of said bar in said bearings, each of said screw threaded bars carrying a nut member, each nut member being provided with means for preventing its rotation relative to said bearings, and said adjusting rollers being idly rotatably mounted on said nut members.
5. The adhesive laying device according to claim 2, wherein a guiding roll of even diameter along its whole length is disposed against the inner face of the lower run of said endless belt, in the proximity of the belt adjustable guiding means.
6. In and for a screen printing machine having an endless belt with an outer face and an inner face adapted to receive a sheet material to be printed, and a driving rotary drum around which said endless belt flexes, said belt extending horizontally and having an upper run and a lower run; an adhesive laying device according to claim 2, wherein said coating roll is connected to said driving drum of said belt through a desmodromic transmission, whereby the peripheral spaced of said coating roll is equal to the linear speed of said belt.
US3809009A 1971-04-01 1972-03-22 Device for applying a layer of adhesive on an endless belt in a screen printing machine Expired - Lifetime US3809009A (en)

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FR7111467A FR2132914A5 (en) 1971-04-01 1971-04-01

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DE (1) DE2215194A1 (en)
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NL (1) NL7203679A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6622623B1 (en) * 1998-06-03 2003-09-23 Heidelberger Druckmaschinen Ag Method for conveying sheets in a printing machine and a device for carrying out the method

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US807685A (en) * 1905-09-14 1905-12-19 Robert A Pelham Pasting apparatus.
US1399975A (en) * 1920-12-07 1921-12-13 Mcconnell George Gluing-machine
US1618809A (en) * 1925-03-02 1927-02-22 Parco Specialty Co Boot and shoe manufacture
US2054822A (en) * 1932-03-30 1936-09-22 Irving L Keith Cementing machine
US2406056A (en) * 1943-11-24 1946-08-20 Minnesota & Ontario Paper Co Means for coating papers
US2606520A (en) * 1949-03-12 1952-08-12 Paper Patents Co Paper-coating machine
US2655865A (en) * 1946-12-24 1953-10-20 Geiringer Walter Apparatus for affixing fabric to printing tables
US3310304A (en) * 1966-02-28 1967-03-21 Comitetul De Stat Pentru Cultu Sheet feed deflector and interrupter responsive to photoelectric sheet position sensing means
US3627557A (en) * 1969-08-27 1971-12-14 Xerox Corp Liquid development by reducing the viscosity of the developer on a roller applicator prior to development
US3712214A (en) * 1969-09-13 1973-01-23 Ricoh Kk Copy sheet discharge device with removable rollers

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US807685A (en) * 1905-09-14 1905-12-19 Robert A Pelham Pasting apparatus.
US1399975A (en) * 1920-12-07 1921-12-13 Mcconnell George Gluing-machine
US1618809A (en) * 1925-03-02 1927-02-22 Parco Specialty Co Boot and shoe manufacture
US2054822A (en) * 1932-03-30 1936-09-22 Irving L Keith Cementing machine
US2406056A (en) * 1943-11-24 1946-08-20 Minnesota & Ontario Paper Co Means for coating papers
US2655865A (en) * 1946-12-24 1953-10-20 Geiringer Walter Apparatus for affixing fabric to printing tables
US2606520A (en) * 1949-03-12 1952-08-12 Paper Patents Co Paper-coating machine
US3310304A (en) * 1966-02-28 1967-03-21 Comitetul De Stat Pentru Cultu Sheet feed deflector and interrupter responsive to photoelectric sheet position sensing means
US3627557A (en) * 1969-08-27 1971-12-14 Xerox Corp Liquid development by reducing the viscosity of the developer on a roller applicator prior to development
US3712214A (en) * 1969-09-13 1973-01-23 Ricoh Kk Copy sheet discharge device with removable rollers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6622623B1 (en) * 1998-06-03 2003-09-23 Heidelberger Druckmaschinen Ag Method for conveying sheets in a printing machine and a device for carrying out the method

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FR2132914A5 (en) 1972-11-24 application
NL7203679A (en) 1972-10-03 application
DE2215194A1 (en) 1972-10-05 application

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