|Publication number||US3557690 A|
|Publication date||Jan 26, 1971|
|Filing date||Sep 23, 1968|
|Priority date||Sep 26, 1967|
|Also published as||DE1785299A1, DE1785299B2, DE1785299C3|
|Publication number||US 3557690 A, US 3557690A, US-A-3557690, US3557690 A, US3557690A|
|Original Assignee||Buser Ag Maschf Fritz|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (10), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
ited States Patent Inventor Heinrich Voegelin Wiler near Utzensdorf, Switzerland Appl. No. 761,773 Filed Sept. 23, 1968 Patented Jan. 26, 1971 Assignee Fritz Buser AG, Maschinenfabrik Wiler near Utzensdorf, Switzerland a corporation of Switzerland Priority Sept. 26, 1967, Aug. 20, 1968 Switzerland 13404/67 and 12500/68 ROTARY SCREEN PRINTING MACHINE EQUIPPED WITH IMPROVED SQUEEGEE SYSTEM OR THE LIKE 8 Claims, 6 Drawing Figs.
U.S.Cl..... 101/120 lnt.Cl B41l 13/06 Field ofSearch lOl/1l6,
 References Cited UNITED STATES PATENTS 1,480,348 1/l924 Cadgene et al. 101/120 2,445,666 7/l948 Ellam 101/119 2,928,340 3/1960 Stein et a1. lOl/lZO FOREIGN PATENTS 611,872 4/1935 Germany 101/120 493,l50 10/1938 Great Britain..... 10l/120 513,905 lO/l939 Great Britain l0l/l20 Primary ExaminerRobert E. Pulfrey Assistant ExaminerAlan E. Kopecki Att0rneyWerner W. Kleeman ABSTRACT: There is disclosed an improved rotary screen printing machine incorporating individual printing stations equipped with a substantially circular printing screen beneath which passes the backing cloth or printers blanket supporting the material which is to be printed. A squeegee system or the like is inserted in the circular printing screen. According to the invention, the squeegee system which is mounted at both sides of the circular printing screen at the machine frame is constructed to be pivotable.
PATENTED JANZ 6197i sum 1 or 4 FIG. 1
INVENTOR Hgmmlk Monmm 4m #9..-
ATENTEU JAN 2 6197| SHEET t Of 4 INVENTOR ifil m ATTORNEW ROTARY SCREEN PRINTING MACHINE EQUHPED WITH IMPROVED SQUEEGEE SYSTEM Olit THE LIKE BACKGROUND OF THE INVENTION The present invention broadly relates to an improved rotary screen printing machine and, in its more specific aspect, concerns an improved arrangement of the squeegee system or the like associated with the circular printing screen.
Rotary screen printing techniques constitute a continuous printing method in which the material. is printed upon by means of circular printing screens or the like. The printing ink or dye is delivered into the interior of the circular printing screen and escapes through the fine perforated screen material. Although rotary screen printing machines permit of a continuous operation, still it is impossible to prevent interruptions in the working cycle. Upon stopping the printing operation, whether it be because of changing the printing ink or for any other reasons, the printing ink immediately passes through the perforations of the circular printing screen and soils the fabric or material to be printed or at the very least the backing cloth or printcrs blanket. Furthermore, during longer down times of the machine the danger exists that the ink will, apart from soiling the printer's blanket, also contaminate further components of the machine.
SUMMARY OF THE INVENTION It is a primary object of the present invention to effectively overcome these drawbacks.
A more specific object of the present invention relates to an improved rotary screen printing machine wherein the squeegee system or the like is constructed in such a manner that during nonuse of the machine, it is possible to prevent contamination of the material being printed, the printers blanket and other parts of the machine by the printing ink.
Still a further significant object of the present invention relates to an improved rotary screen printing machine which is relatively simple in construction, extremely reliable in operation, requires a minimum of servicing and maintenance, and effectively prevents improper contact of the printing ink with the material being printed or other components of the machine.
Another, more specific object of the present invention relatcs to an improved rotary screen printing machine provided with means which insure that the printing ink is returned to a location where it cannot unintentionally come into contact with the material upon which the printing operation is carried out during such time as the machine is brought to a standstill Now, in order to implement these and still further objects of the invention, which will become more readily apparent as the description proceeds, the invention contemplates constructing the squeegee system which is mounted at both sides of the circolor printing screen at the machine frame so as to be pivotable.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood, and objects other than those set forth above, will become apparent, when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
FIG. I is a schematic sectional view through a circular printing screen equipped with an inserted squeegee system and shown in its printing position; and
FIG. 2 is a sectional view through the circular printing screen with inserted squeegee system, corresponding to the arrangement of FIG. 1, but depicting the printing screen and the associated squeegee system in a rest position;
FIG. 3 is a sectional view taken through a support equipped with the bearing or support means for the squeegee system of the rotary screen printing machine, and taken along the lines l-l ofFIG. 4;
FIG. 4 is a front view showing detailsof the support or mounting for the squeegee system as viewed from the nonserviced side of the machine, that is to say, at the side where the ink is introduced;
FIG. 5 is a front view of the support or mounting for the squeegee ystem as viewed from the servicing side of the machine; z, nd
FIG. 6 is a fragmentary view showing a detail of the squeegee support tube.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, it will be understood that reference numeral 1 designates the substantially circular printing screen which is constructed as a fine-perforated thinwall hollow cylinder member. This circular printing screen I is rotatably mounted in suitable fashion at both sides of the nonillustrated machine frame. As is known to those versed in the art, the circular printing screen 1 is appropriately driven in synchronism with the backing cloth or printer's blanket 2. The material or fabric 3 which is to be printed is carried on the printers blanket 2 and this material is suitably fixed thereon. Moreover, the printer's blanket 2 is prestressed or tensioned in an appropriate way and forms a smooth printing support. In order to be able to carry out a faultless printing operation a conventional nonillustrated counterpressure roller is advantageously arranged beneath each circular printing screen 1, but has been omitted to preserve clarity in illustration.
The support means for the circular printing screen 1, as also is the case with the circular printing screen itself, possesses a rather large free opening through which it is possible to introduce the squeegee system, generally designated by reference character 20. This squeegee system 20 or equivalent structure serves for the introduction of the printing ink or dye to the inner jacket surface of the printing screen 1 and also provides for a proper dosage of such printing ink. In the exemplary illustrated embodiment, it will be recognized that the squeegee system 20 embodies a de1ivery-or squeegee tube 4 which serves as a squeegee support and carries the squeegee 5 as well as the flow control squeegee 6.
The squeegee system 20 is rotatably mounted at both sides of the circular printing screen 1 externally at the machine frame in a manner which will be explained more fully hereinafter. As already alluded to above, this squeegee system 20 is disposed within the circular printing screen 1 and also passes through the support means for the circular printing screen. The rotational support for the squeegee system is brought about through the provision of two segments 9 arranged at both sides of the machine frame, and between which the squeegee system 20 is arranged. These segments 9 are rotatably secured at the pivot points 10 at the machine frame. A slit II is provided at each segment 9 which renders possible the raising and lowering of the squeegee system, in order to thereby accommodate the squeegee 5 to the diameter of the printing screen 1, to adjust for the desired squeegee pressure and to be able to compensate for any wear of the squeegee.
The rotatable attachment arrangement for the squeegee system functions in the following manner:
Directly after stopping of the rotary screen printing machine the described apparatus is rotated in the direction of the arrow 12 about the point of rotation 10 which is disposed or located at the middle or central region of the circular printing machine, until it assumes the rest position shown in FIG. 2. Now, the printing ink located within the circular printing screen I flows along the flow control squeegee 6 downwards and is caught by the catch nose '7. The printing ink, as generally indicated by the arrow 14, flows through the bore means 8 back into the squeegee tube t.
If the printing operation is then continued, then the described apparatus is rotated further in the direction of the arrow 15 and brought into the printing position. The transition from the printing position to the rest position can advantageously be undertaken by means of a suitable drive motor, and specifically in such a fashion that upon actuation of this motor the squeegee system is rotated into the rest position and retained at such location, whereas upon further actuation of the drive motor the squeegee system is brought from the rest position into the printing positionand retained in the latter location.
it should be'understood that for the practical operation of the aforedescribed apparatus it isof importance that the squeegee system can be easily dismantled and removed. FIGS. 3 to 6 illustrate a particularly advantageous solution for the pivotal mounting of the squeegee system. Referring to these figures now, it will be understood that reference numerals 101 and 102 designate the support means which are carried at both sides of the nonillustrated machine frame. The circular printing screen, which is not visible in these figures, is rotatably mounted in such support means 101, 102. More specifically, the circular printing screen is secured to the sup port or bearing body member 103 sewing for the mounting of the printing screen, and, if desired, such printing screen can be secured to this bearing body member 103 through the intermediary of elastically flexible intermediate body means, in a manner not shown in greater detail herein since it is not neces- V sary for the understanding of the inventive concepts Continuing, it should be understood that the support or bearing body 103 is mounted in bearing means 104, 105, and driven via a gear 106. As best recognized by referring to FIG. 3, a number of segments 107 are secured to the support 101 with the help of screws 108 or equivalent fastening expedients. These segments 107 provide a support arrangement for a ring member 109 carrying the squeegee system or unit. This ring member 109 is rotatably mounted in the support segments 107.
Furthermore, it will be understood that at the oppositely situated support 102 a further ring member 110 is mounted in exactly the same manner. At least one of both rings 109, 110 possesses an externally toothed portion 111, in this case shown provided at ring 109, which toothed portion 111 meshes with the teeth of a counter gear 112. A suitable time mover or power source, schematically indicated by refefence numeral 200, serves to drive the ring 11 1 by means of the'gear 112. it has been found that the prime mover 200 can" advantageously be a hydraulic motor which, for instance, receives its pressurized medium from the pressurizedmedium network already available at the machine and required for the lowering of the printing components.
By best referring to FIGS. 4 and 5, it will be recognized that the ring members 109 and 110 carry lever members 113 and 114, respectively, which are, in turn, pivotally mounted at the pivot pins 115 and 116, respectively, arranged at the aforesaid ring members 109 and 110. Suitable adjustment means 117 and 118 are provided at the respective free ends of the respective lever members 113 and 114. Each of these adjustment means 117 and 110 is composed of a manually operable spindle-stroke adjustment mechanism 117a and 110a respectively,
supported at the ring members 109 and 110, respectively. The
stroke adjustment mechanisms 1l7aand 118a of the adjustment means 117 and 118 respectively, are hingedly connected by means of bolts 119 and 120, respectively, to the associated levers 113 and 114 and serve for adjusting the position of such associated lever with respect to the associated ring member v109 and 110. Furthermore, it will be recognized that a stop member 121 and 122 is arranged at the respective ring members 109 and 110. In the working position of the squeegee system these stops 121 and 122 bear against adjustable stop members 123 and 124, respectively, and in the rest position of the squeegee system, such stops 121 and 122 bear against stationary arranged stop means 125 and 126, respectively,arranged at the support members 101 and 102 respectively.
1 The squeegee system is mounted at both of the lever members 113 and 114. Thissqueegee system is composed of a squeegee support tube or pipe 127, typically formed of rustproof or stainless steel, and which possesses a smaller diameter, as indicated by reference numeral 128, at the ink infeed side of such tube 127 than the remaining portion 129 of such All tube. At the servicing side of the machine this tube is located in a bore 130 of the lever member 114, through which there is guided a pin member 131. This pin member 131 fits in a slot or groove 132 (see FIGS. 5 and 6) arranged at the plug member 133 by means of which the tube 127 while utilizing an O-ring 134 is sealed. The bore 130 possesses sufficien t play so that the squeegee support tube 127 can be introduced at an inclination from the ink delivery side until the pin member 131 is disposed in the slot or groove 132, whereby entrainment of the squeegee system is insured.
The mounting of the squeegee support or mounting tube 127 at the ink delivery side deviates from the mounting arrangement provided at the servicing side of the machine. More precisely, by referring to F161 4 it will be recognized that two rectangular blocks135 and 136 are fixedly clamped with the tube portion 128 by means of two screws for instance or equivalent fastening devices. One of these two blocks, such as the block 136 is somewhat larger than the other and fits into a suitable recess 137 provided at the lever'member 113 and is engaged by two cams or dogs 138 and 139, as shown. Consequently, the squeegee support or mounting tube 127 can only be axially removed or withdrawn. The removal of the squeegee support tube and the squeegee system initially occurs through axial displacement of the tube 127 until the blocks 135 and 136 are pushed out of the support or recess 137 of the lever 113. Thereafter, the squeegee system can be lifted and moved out of the opening provided at the ring member 109. The remounting of the squeegee unit is undertaken in thesame way but with a reverse sequence of steps. The squeegee system is introduced at an inclination into the bore 130, prior to reaching the support 137 is lowered by means of the blocks 135 and 136 into the horizontal position and the terminal position is reached by carrying out axial displacement, so that the pin 131 again engages in the slot 132 and the bloel 136 engageswith the support or recess 137 of the lever 113.'ln order to fix the position of the squeegee system there is advantageously provided a spring loaded stop arrangement 140 which prevents an axial displacement of the squeegee system during operation.
While keeping the foregoing in mind, it will be recognized that in order to, pivot or rock the squeegee system into the rest position the ring members 109, 110 are rotated through about 180 in counterclockwise direction from the position shown in FIG. 5 and through the action of the prime mover or drive means 200 and via the gear 112, as previously explained, until the cam means or steps 121 and 122 bear against the fixed stops 125 and 126 respectively. Thesqueegee system is rigidly connected for rotation by means of the pin 131 with the lever members 113, 114 and thus rotates together with the movement of the ring members 109 and 110. By means of the movable or adjustable stops or stop members 123 and 124 it is possible to adjust the position of the squeegee in the work position through an angular range designated by the angles 0:62. This adjustment possibility is of considerable importance for attaining a faultless printing operation at the material or fabric and the setting is undertaken in accordance with the type of ink or dye which is used and the momentarily employed circular printing screen.
A further adjustment possibility for the squeegee is provided by virtueof the spindle-stroke adjustment mechanisms 117a and 1184 of the adjustment devices 117 and 118 respectively. By virtue of this adjustment feature it is possible to adju'st the squeegee considerably in the radial direction. Consequently, the squeegee pressure can be regulated and any wear of the squeegee itself can be compensated quite easily.
The possibility of being able to pivot or rock the squeegee within a predetermined angular range provides the advantage of enabling a simplification of the construction of the squeegee support profile 143, which in its basic structure consists of three ribs or webs 143a and is secured in suitable fashion to the squeegee tube 127; As best shown by referring to FIG. 5, two of these ribs 143a serve for fixedly clamping the squeegee 142, whereas the third rib or web forms together with both of the clamping ribs for the squeegee 142 a trough 143b when the squeegee system is rocked into the rest position. The ink accumulations or clots can flow into this trough 143b and from this location the ink can flow through bore means 144 back into the squeegee tube or pipel29. In this in: stance the normally employed flow control squeegee can be omitted since, due to the possibility of adjusting the squeegee 142 either opposite or in the direction of travel A of the material to be printed the printing operation, especially as concerns the dosing of the quantity of printing ink, can be int'luenced in the same manner as is possible with a flow control squeegee of the type previously considered inconjunction with FIGS. 1 and 2.
It should be apparent from the foregoing detailed description, that the objects set forth at theoutset to the specification have been successfully achieved.
1. A rotary screen printing machine of thetype incorporating individual printing stations provided with a substantially circular printing screen, a printers blanket for the material to be printed passing beneath said circular printing screen, a squeegee system inserted in said circular printing screen for expressing printing ink through said circular printing screen, means for pivotably mounting said squeegee system at both ends of said circular printing screen, said mounting means for said squeegee system incorporating a support at each end of said circular printing screen in which said screen is rotatably mounted, a ring member rotatably carried by each support for rotatably supporting said squeegee system with respect to said screen, a respective lever member pivotally secured to each of said ring members and serving to support said squeegee system, drive mechanism for rotating said ring members with respect to said screen, and adjustment means cooperating with each of said lever members and secured to each associated ring member for pivoting the associated lever member with respect to its associated ring member.
2. A rotary screen printing machine as defined in claim 1, wherein said squeegee system incorporates a squeegee tube defining an infeed tube for the printing ink, said squeegee tube being provided with bore means, said squeegee system when pivoted into a rest position causing the printing ink to flow back through said bore means into said squeegee tube.
3. A rotary screen printing machine as defined in claim 1, wherein said squeegee system includes a squeegee tube, and wherein said adjustment means defines mechanism permitting radial adjustment of said squeegee tube with respect to the circular printing screen.
4. A rotary screen printing machine as defined in claim 1, further including stop means for adjusting and limiting the pivotable movement of said squeegee system.
5. A rotary screen printing machine as defined in claim 4, wherein at least one of said ring members is provided with external teeth means, said drive mechanism including gear means engaging with said external teeth means for pivoting the associated ring member, and a drive motor for driving said gear means.
6. A rotary screen printing machine as defined in claim 5, wherein said drive motor comprises hydraulic motor means.
7. A rotary screen printing machine as defined in claim 4, wherein said squeegee system incorporates a squeegee element, said stop means for adjusting the pivotal movement of said squeegee system serving to regulate the point of application of said squeegee element to both sides of its vertical position within a predetermined angular range.
8. A rotary screen printing machine as defined in claim 4, wherein said squeegee system comprises a squeegee tube, a squeegee support profile member having three webs secured to said squeegee tube, two of said webs being adapted to fixedly clamp a squeegee therebetween, and the third of said webs cooperating with said squeegee clamping webs to form a trough for receiving the printing ink when the squeegee system assumes a rest position, and bore means communicating said trough with said squeggee tube in order to permit the printing mk to pass via sai bore means back into said squeegee tube.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1480348 *||Dec 5, 1922||Jan 8, 1924||Ernest Cadgene||Fabric-printing machine|
|US2445666 *||Apr 17, 1946||Jul 20, 1948||Frederick Ellam||Inking device for rotary duplicating machines|
|US2928340 *||Mar 21, 1957||Mar 15, 1960||Stein||Textile printing machine|
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|GB493150A *||Title not available|
|GB513905A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
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|US3960076 *||Feb 25, 1974||Jun 1, 1976||Fritz Buser Ag Maschinenfabrik||Rotary screen printing machine with angle and pressure adjustable squeegee|
|US6703118 *||Apr 8, 2002||Mar 9, 2004||Stork Screens B.V.||Printing form for rotary screen printing made from fiber-reinforced plastics material|
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|US20050000374 *||Jul 15, 2004||Jan 6, 2005||Minami Co., Ltd.||Screen printing apparatus|
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|International Classification||B41F15/46, B41F15/40|