Abstract: A layer of ink containing a light absorbing heat generating substance is provided on the rear surface of a heat-sensitive plastic film of a thermal stencil sheet when the heat-sensitive plastic film is perforated by a laser beam. When a rotary stencil printer is used, a stencil sheet is mounted around a printing drum of the rotary stencil printer in a condition adhesively held by an ink layer, then a laser beam is irradiated to a portion of the stencil sheet to be perforated, and then the printing process is carried out with the stencil sheet as it has been mounted around the printing drum for the perforation.

Abstract: A reliable, small and light stencil duplicating machine comprises a printing section, a sheet feeding section, and a sheet discharging section. The printing section includes a printing drum for wrapping a stencil thereon, a press roller and parts associated with a printing process. The sheet feeding section feeds each printing sheet into a space between the printing drum and the press roller. A printed sheet is stripped off from the printing drum by a sheet separating member of the sheet discharging section, and is discharged onto a tray.

Abstract: A printing drum is rotatable supported by a fixed hollow cylindrical member at two axially spaced positions thereof so that the printing drum may be supported in a highly stable fashion and any mis-alignment of the printing drum can be avoided. Also, the interior of the fixed hollow cylindrical member provides an easily accessible space for accommodating a printing ink container and a pump for supplying printing ink. In particular, by using a squeegee blade instead of a squeegee roller, a particularly advantage can be obtained because the diameter of the fixed hollow cylindrical member can be such that an annular chamber defined between the fixed hollow cylindrical member and the inner circumferential surface of the printing drum is barely sufficient to accommodate the squeegee blade in the annular chamber, and the fixed hollow cylindrical member can provide a highly rigid support structure.

Abstract: The stencil printing device of the present invention comprises a mixing unit for receiving the first liquid from the first liquid storage container and the second liquid from the second liquid storage container, and producing printing ink by mixing the two liquids, a printing ink supply passage for conducting the printing ink produced by the mixing unit to an ink squeegee unit of a printing drum, ink amount sensor for detecting the amount of the printing ink in the ink squeegee unit, and ink supply control unit for controlling the amount of the printing ink that is supplied from the mixing unit to the ink squeegee unit according to the amount of printing ink detected by the ink amount sensor. Thus, a relatively large number of prints can be made with each bottle of printing ink so that the frequency of replacing the ink bottle may be reduced.

Abstract: A spray method and apparatus for uniformly coating a surface with a high degree of efficiency includes filling the pores of a porous sheet with a liquid and then directing compressed fluid from a nozzle into the sheet from one side to spray the liquid onto a surface spaced from an opposite side. Because the total volume of the pores is known, the volume of the sprayed liquid is also known. Moving the nozzle relative to the sheet and the substrate enables the entire surface to be uniformly coated. The size and distribution of the pores on the sheet define the distribution of the liquid sprayed onto the substrate. The coating may be a thick or a thin film of uniform thickness, or may even comprise a recognizable pattern.

Abstract: To provide a stencil printing device of a multi printing drum type which can be reduced in size without complicating the path of conveying printing paper and without compromising the ease of maintenance, a plurality of printing drums are arranged along an inclined line of a prescribed angle of inclination, and the path of conveying printing paper between each pair of adjacent printing drums is defined, for instance, as a straight line. A plate making unit, a plate ejection unit and a paper feeding unit are arranged in the space defined above and below the inclined line along which the printing drums are arranged so that a compact design may be accomplished.

Abstract: A mimeographic transfer printing machine includes a stencil support drum for supporting a stencil, an ink supply device for forcing ink through the stencil supported on the stencil support drum, an ink receiving transfer drum to which the ink forced out from the stencil is to be transferred, and a sheet support device for supporting a printing sheet to which the ink on the ink receiving transfer drum is to be transferred. The stencil support drum has a slightly larger diameter than the transfer drum so that the circumferential speed of the stencil support drum is greater than that of the transfer drum to provide to the stencil a tension acting in a direction opposite to the rotation of the stencil support drum.

Abstract: In a squeegee device for supplying ink in a stencil printing device from the interior of a cylindrical, ink permeable printing drum which rotates around an axial line thereof with a stencil master plate wrapped around the outer circumferential surface thereof, to prevent a squeegee blade from developing a juddering movement relative to the cylindrical printing drum, and to allow the squeegee blade to sufficiently intimately contact the inner circumferential surface of the printing drum so that printing ink may be supplied to the printing drum by a prescribed amount in a stable fashion at all times, a thin spring plate is placed on a reverse surface of the squeegee blade made of a rubber-like elastic material which is in engagement with the inner circumferential surface of the cylindrical printing drum.

Abstract: Doctor blade and doctor blade device for the application of flowable substances on flat surfaces with a doctor blade profiled rod and a doctor blade element, a magnetic device is assigned to the doctor blade, the arrangement, shape, strength of the magnetic field produced by this device determines the local position of the doctor blade, and additionally through this magnetically determined position and fixation and through device parts, the angular position of the doctor blade is also adjusted, whereby the doctor blade has limited freedom of movement.

Abstract: An emulsion coater apparatus for filling a screen with emulsion is described. A head delivers pressurized emulsion onto and through holes in a screen. Squeegees located on either side of the screen are then drawn across the screen's surface so as to remove excess emulsion and fill any holes not filled by the high pressure head. The emulsion coater apparatus coats a screen in a single pass, thus making the coating process more efficient. Moreover, dispersing emulsion under pressure alleviates the need to degrease the screen, saving costs and minimizing environmental damage.

Abstract: Ink leakage from the trailing edge of the stencil master plate is avoided and a stable ink supply is ensured when using a D-type printing drum including a concentric cylindrical part extending over a major part of an entire circumference of the printing drum and defining an ink permeable region, a non-concentric cylindrical or planar part extending over a minor part of an entire circumference of the printing drum and having a central axial line different from that of the concentric cylindrical part, and an outer circumferential surface on which a stencil master plate is to be mounted without losing the benefit of reducing the displacement of the press roller.

Abstract: A printer for printing a stencil image on a sheet is provided having a scraper which prevents ink from flowing axially outward beyond the ink supply roller. The scraper can be connected to a plate which supports the ink supply roller and preferably includes a portion extending toward and/or contacting the ink supply roller.

Abstract: A printer for printing out an image formed in a stencil on a sheet. The stencil formed with perforations representative of an image is wrapped around a drum which is made up of a hollow cylindrical support and a mesh screen covering the support. The cylindrical support has an apertured portion and a non-apertured portion and accommodates an inking roller therein for supplying ink to a sheet via the stencil. The sheet is pressed against the stencil by a press roller that faces the inking roller with the intermediary of the drum. A high friction member is located at a predetermined position on the non-apertured portion of the drum or a predetermined position on the mesh screen corresponding to a position where the press roller begins to press a sheet against the stencil.

Abstract: The rotary screen printing apparatus is designed for ease of operation including adjustments and changes. The apparatus is also designed to fit into a press between the last print station and the first die cut station without modification to the press due to use of a 5 o'clock print position.

Abstract: A screen printing machine comprises a frame in which one or more stencils are supported for printing a web of material fixed on a supporting belt. The stencils are each directly connected by means of a rigid coupling to the rotor of a corresponding rotary drive device. An elongated squeegee, supported near the ends of the stencil, is provided in the interior of each stencil. The drive device is provided with a central through hole running in the axial direction, for allowing through at least the end of the squeegee with radial play.

Abstract: A doctor for applying material, having a pressing part (doctor body) bending elasticly in the longitudinal direction and corresponding to the application width and a row of segments for pressing the pressing part, the segments (20) are connected in link-like manner by web or holding parts (203, 29, 39, 4, 40 to 48) to a unit-forming pressing device (2) pressing at least one pressing part (3, 30, 31, 32, 36), and the segments (20) being held independently to the pressing part (3, 30, 31, 32, 36).

Abstract: A doctor blade for use in an adhesive screen printing apparatus is formed of a main blade member of spring steel along with a U-shaped cap. The cap is ideally formed of a filled nylon material and is attached to the blade member with a silicon RTV compound. The use of this construction results in much more even laydown of adhesive from pattern to pattern and from the left and right hand sides of the screen. Use of the invention also serves to increase screen life.

Abstract: A mimeographic printing machine general comprises: a rotary plate cylinder for supporting a stencil on an outer circumferential surface thereof and having a perforation for passage of ink, the plate cylinder being rotatable with the stencil; means for supplying the ink to an inner circumferential surface of the plate cylinder; a squeegee movably received in the plate cylinder so as to come into and out of contact with the inner circumferential surface of the plate cylinder, the squeegee being operable to squeeze the ink from the supplying means toward the outer circumferential surface of the plate cylinder through the perforation of the plate cylinder; and a rod-shaped member rotatably received in the plate cylinder. The rod-shaped member is located behind the squeegee in the rotating direction of the plate cylinder and is movable with the squeegee for jointly holding the ink.

Abstract: A liquid, foam or paste treatment medium is applied to a textile or similar web as the web is led through a gap in which the web is pressed resiliently against an opposing face in an area extending over the width of the web with non-uniform pressure by, for example, several adjacent cushions that are independently inflatable. The non-uniform pressure serves primarily to achieve uniform treatment, in particular, uniform coloring, despite the non-uniform conditions existing over the web width. The non-uniform pressure may also be used for imprinting patterns on the web.

Abstract: A screen printing apparatus comprising a screen having an opening or openings of a desired print pattern and having a lower surface being positioned adjacent to a substrate to be printed, and a nonflexible squeegee comprising a cavity for containing a material to be printed on the substrate. The cavity is defined by the interior surfaces of surrounding walls extending generally vertically from the lower extremities at which the squeegee directly contacts the upper surface of the screen. While the squeegee travels with respect to the screen the material to be printed flows from the cavity into the openings of the screen, and thereby onto the substrate. The squeegee may be formed of stainless steel, a ceramic material or a synthetic resin.

Abstract: Described is a lifting device for cylindrical templates in printing machines, with an inking tube extending through each cylindrical template, the lifting device travelling along a rail running parallel to the direction of the cylindrical template and along a rail travelling in a direction normal thereto and which can be releasably connected to the inking tube. The lifting device is constructed in the form of a hydraulically or pneumatically operated telescopic arm, always in the vertical position, which carries a tong-like gripper (2) for releasable connection with the inking tube (3).

Abstract: This invention provides a method and an apparatus for direct formation of a stripe pattern on a textile substrate such as sliver. The object of the invention is to dispense with a gill which would interfere with a high-speed feed of said textile substrate and thereby improve the efficiency of coloration. In accordance with this invention, a color supply hollow drum 2 and a color suction hollow drum 3 are vertically juxtaposed and a continuous length of fibrous material is continuously fed between said two drums 2, 3 by rotation thereof. As the substrate material is thus fed, a color composition is supplied from color supply grooves 8 of the color supply hollow drum 2 while it is drawn by a suction force acting in color suction grooves 13 of the color suction hollow drum 3 to cause the color composition to strike through the fibrous substrate material to thereby form color stripes of substantially the same configuration as that of the above-mentioned grooves on the fibrous substrate material.

Abstract: A rotary screen printing apparatus for delivering coating fluid from the inside of a print cylinder through patterned openings onto an adjacent advancing substrate, having a print cylinder support frame, a drive mechanism for rotatably driving the print cylinder, a resilient suspension device for supporting the print cylinder at high rotational speeds, an adjacent radiant heater for generating heat energy for absorption by the print cylinder, an enclosure substantially surrounding the print cylinder and confining the radiated heat therein, at least one infrared sensor for sensing heat emitted from the print cylinder, and a control circuit for controlling the radiant heat energy from the heater in response to the sensed emitted radiant energy, about a manually controlled set point.

Abstract: A squeegee head for the printing of bodies by the screen printing method, the head including a squeegee rubber and a holder for retaining the rubber, the holder comprising a plurality of adjacently arranged holder members which are each guided in the squeegee head for mutually independent reciprocating movement in the contact direction, and are held under a contact force.

Abstract: A rotary screen printing device for delivering coating fluid from the inside of a print cylinder through patterned openings onto an adjacent advancing substrate has a print cylinder support frame, a ring-shaped major idler having its periphery retained in rolling contact supported by several minor idlers near each side member of the support frame for rotation about the print cylinder's axis, a plurality of swiveling hooked torque rods, slidably mounted for axial movement at spaced intervals around each major idler, having a hooked inner end facing the opposite major idler, and a resilient mounting urging the hooked end toward its supporting major idler, and a pair of end rings, each secured in telescoped relationship inside one end of the print cylinder, with notches being formed at spaced intervals in the inner periphery of each ring for alignment with the swiveling hooked torque rods of a major idler.

Abstract: Apparatus for applying a foamed medium to a running workpiece has a tubular housing which is disposed in the interior of a rotary screen and forms part of a slotted squeegee whose outlet allows the foamed medium to flow from the interior of the housing against the internal surface of the screen. The outlet contains one or more deflectors in the form of shoulders, bars, rods or other types of obstacles which prevent the medium from flowing along a straight path from the opening or openings of the housing directly against the internal surface of the screen. This reduces the likelihood of non-uniform application of the medium to the workpiece.

Abstract: A method and apparatus for printing directly onto a surface employs a printing plate through which pigmented fluid passes directly onto such surface and a reservoir for supplying a highly uniform distribution of pigmented fluid preferably at a relatively accurately controlled pressure to the printing plate. A plurality of minute openings through the printing plate forming a printing image thereon controllably pass the pigmented fluid directly onto such surface. These openings may be tapered to reduce misting and to facilitate breaking surface tension as pigmented fluid is transferred directly to the surface. The reservoir may be a porous, permeable sintered titanium cylinder about which the printing plate is mounted. Moreover, the invention includes a method of forming such a printing plate employing optical, and preferably laser, scanning techniques so that the printing image on the printing plate accurately represents the original image.

Abstract: An apparatus to be used in the screen-printing art distributes viscous printing substance and comprises first and second distribution passages extending lengthwise along an elongated common passage. The distribution passages have first ends in proximity to each other and second ends in proximity to each other. Feed means supply the viscous substance to each distribution passage, each distribution passage having, along its length, a tapered outflow opening. The tapered outflow opening of the first distribution passage increases from the first end to the second end thereof and the tapered outflow opening of the second distribution passage increases from the second end to the first end thereof. The two distribution passages work together to evenly distribute the viscous substance to the elongated common passage.

Abstract: The invention relates to an apparatus adapted to apply a layer of viscous sticky material, particularly varnish, in the form of a pattern or otherwise, to a substrate. The apparatus comprises an applicator roll 1, and an impression roll 2, between which sheets 3 for printing are fed, by feed means.The means for applying the varnish to the applicator roll consist of a cylindrical screen stencil 8 with an internal squeegee device 9.The applicator roll is also displaceable so that it can be moved away from the impression roll 2 in the absence of a sheet to be printed in the event of a malfunction in the feed means.

Abstract: A multi-cylinder stencil duplicator includes ink-applying means in the form of a coating member offering a fixed nip between the coating member and a cylinder of the duplicator, ink being applied to one side of that nip and being held back as a wedge at the nip during rotation of the duplicator cylinder. The dispensing of ink to the wedge is controlled in response to variations in the capacitance between the coating member and the cylinder, so that when the ink wedge drops below a given threshold value further ink is dispensed.

Abstract: An apparatus for applying a treating medium to a screen has a container above the screen and a pipe which discharges foamed treating medium into the container from where an outlet leads to the screen. A foam generator supplies the foam and the pressure at which the foam enters the container can be regulated.

Abstract: For use in a silk screen printing machine including an impression cylinder and a doctor-blade mounted parallel to the surface of the impression cylinder for movement relative thereto; a doctor-blade supported at opposite axial ends respectively by a pair of fluid pressure operated piston and cylinder devices and flow control valves are disposed between a source of pressurized fluid and the devices respectively for raising and lowering the doctor-blade relative to the impression cylinder. A cam mounted for rotation with the impression cylinder coacts with a switch to operate the control valves.Combined with the above are a pair of additional piston and cylinder devices coupled to said doctor-blade support, and associated control valves for controlling the pressure or force applied by the doctor-blade to the surface of the impression roller.

Abstract: Coating a porous substratum with a viscous substance is performed by means of a rotatable cylindrical sieve (plain-mesh screen), comprising an internal squeegee for pressing said substance through the perforations of the screen. The substratum are passed in contact with the screen and is supported at the contact zone by a roller. Although the peripheral speeds of the screen and the substratum is substantially equal, the rotational speed of the support roller is such, that its peripheral speed is either smaller or greater than that of the substratum to an extent of at least 5%. This avoids the occurrence of the phenomenon of pinhole formation in the coated substratum.

Abstract: A latent image-multiple copy process wherein use is made of a stencil in which stencil openings are formed to correspond to the latent image and base sheets in combination therewith, containing an invisible, soluble, color forming component, whereby when the color forming component is depleted from the base sheet in the area underlying the stencil openings, the base sheet can be replaced for the production of additional copies without the need to provide for a new stencil.

Abstract: A squeegee structure for a rotary screen printing machine comprises a fixed portion forming the main supporting element, said portion being adjustable in position. The squeegee further comprises a movable intermediate member, such as a blade of resilient spring steel connected along one edge to said fixed portion, a plastic element having an invariable shape and a smooth and hard surface being mounted on the opposite edge of said blade.

Abstract: A screen printing machine wherein a hollow cylindrical stencil rotates about a stationary but adjustable horizontal header which supplies a liquid and is welded to a carrier for a reciprocable or pivotable holder supporting a blade-like or rod-like squeegee. The latter is biased against the internal surface of the stencil by a deformable tubular cushion which is received in a U-shaped portion of the carrier and is deformed by an elongated extension of the holder which imparts to the cushion a kidney-shaped cross-sectional outline. The cushion can be bonded to the carrier and comprises an elastic hose which is reinforced by one or more textile or metallic layers or a non-elastic hose which is reinforced by one or more layers of elastomeric material.

Abstract: An endless printing screen of generally annular configuration is supported in end bearings. A tubular carrier extends through the space surrounded by the screen and defines with the screen an annular clearance which is subdivided into two or more axially successive chambers. An arrangement of tubes admits printing medium through the carrier into the chambers so that it can pass through the screen to print onto a web beneath the screen. Devices are provided for reciprocating the endless screen and the carrier.

Abstract: A screen printing machine has one or more printing stations. Each station has an endless printing screen of generally annular configuration and is supported in end bearings. A carrier extends through the space surrounded by the screen and defines a clearance with the screen. An arrangement of tubes admits printing medium through the carrier into this clearance. The clearance is subdivided into discrete chambers so that, when different-color printing media are admitted into the different chambers the printing station is capable of printing a multi-color pattern.

Abstract: A control device for controlling the level of a liquid in a container, a tank, a printing machine, or the like, which includes an elongated member in form of a tube or a cable, having a free end adjacent the desired maximum liquid level in the container and being adapted to feed a control medium, i.e., a gas, electric current, or light therethrough, which acts on a signalling device, or control means of a pump for feeding liquid in the container and which are actuated when the liquid reaches the free end of the elongated member. The elongated member being adjustably mounted for adjusting the position of the free end thereof in vertical direction.

Abstract: A printing machine with rotary screens particularly adapted for printing fabrics in which a squeegee-mounting tube extends through each screen supported by a pivotable arm which turns about a vertical axis making it possible to move the arm completely away from the entrance to the screen to facilitate squeegee placement and removal; the height of the arm being adjustable by a composite jack on the axis of rotation of the arm for expediting screen changing or cleaning operations.

Abstract: A web treatment element in the form of a roller is attracted to one side of a web by magnetic attraction from a magnetic element positioned on the opposite side of the web. The magnetic element includes a plurality of electromagnets and a switch connected thereto to reverse the polarity of at least a portion of the electromagnets to selectively alter the polarity alignment of the electromagnets.

Abstract: A paint feeding element to be used in a cylindrical screen stencil machine, said element being composed of an oblong reservoir connected to a paint supply and two converging rigidly-resilient thin strips forming a mouth piece for contact with the inner wall of a stencil, both strips enclosing a steep angle with said wall.

Abstract: A silk screen printing machine wherein a hollow endless stencil surrounds a liquid applying roll and the latter is driven independently of the stencil by a detachable infinitely variable speed drive having a gear which is keyed to an extension at one end of the shaft for the liquid applying roll. The drive is mounted on a carriage so that it can be transported between several screen printing stations.

Abstract: An arrangement on screen printing machines, particularly rotary screen printing machines, in which the dyestuff is taken from a dye pan and passed through the apertures in a screen and is applied onto the web of goods to be treated, which comprises a dye shutter disposed in the penetration zone for the dyestuff on the side of the screen remote from the weg of goods, to be closed when the machine is stopped.

Abstract: A dyestuff applicator, overlying an area of contact between a movable printing screen and a substrate, comprises a horizontal supply tube which supports an axially extending dyestuff-distributing member with freedom of relative mobility in a vertical axial plane of the tube. The bottom portion of the distributing member, forming an axially extending dyestuff outlet in the shape of a slot or a multiplicity of closely spaced apertures, is separated from its top portion, secured to the tube, by a bar-shaped body of relatively soft material which is readily compressible in the vertical direction while resisting deformation in a horizontal plane. The distributing member is weighted down by the pressure of the liquid dyestuff in a overlying space or by springs inserted between that member and the supply tube.

Abstract: An adjustable holder secures the squeegee or doctor blade within the rotary stencil of the machine to swing or rock about an axis which is above, and closely adjacent to the contact line of the screen and the printer's blanket or backing cloth, as supported by a support rail, resiliently pressed against the screen to form the contact line at which material to be printed is engaged by the screen.

Abstract: A dyestuff applicator, located inside a cylindrical printing screen, comprises a horizontal ink tube which supports an axially extending ink-distributing member with freedom of relative mobility in a vertical axial plane of the tube. The distributing member, resting on the inner screen surface, forms a discharge slot communicating with the interior of the tube through a multiplicity of conduits closely spaced along the tube axis, the conduits being disconnectable from the slot with the aid of an axially slidable or rotatable shutter common to all the conduits and lodged in the distributing member. This distributing member is weighted down by the pressure of the ink in an overlying space, or by springs or fluid cushions inserted between that member and the tube.

Abstract: A dyestuff applicator, overlying an area of a movable printing screen through which dyestuff is to be fed to a substrate, comprises a horizontal supply tube which supports an axially extending dyestuff-distributing member with freedom of relative movement in a vertical axial plane of the tube. The distributing member, resting under pressure on the screen, forms a discharge slot communicating with the interior of the tube through a multiplicity of conduits closely spaced along the tube axis, the conduits being disconnectable from the slot with the aid of a slidable or rotatable shutter lodged in the distributing member and controlled by an external actuator mounted on the supply tube.

Abstract: A dyestuff applicator inside a cylindrical printing screen comprises an elongate hollow body with a bottom portion contacting the inner screen surface and an outlet for ink supplied to that body through one of two tubular extremities thereof, these extremities being clamped in respective mountings with their axes disaligned to generate stresses counteracting the forces of gravity and friction which tend to deform the outlet from its linear shape. Each end mounting may comprise a pair of axially spaced rigid rings with toroidal inner surfaces, of adjustable relative elevation, or an elongate sleeve cradled in a vertically adjustable bearing frame in which the sleeve can be immobilized at a desired inclination to the horizontal and the vertical. The sleeve may have a yieldable lining or be braced by damping springs and dashpots against oscillations of the applicator body.

Abstract: A screen printing machine which includes a frame, a backing member supported by the frame, and at least one rotary screen assembly carried by the frame in adjustable relationship with respect to the backing member. Each rotary screen assembly includes an inner elongated support member, an outer hollow screen rotatably supported about the inner elongated support member for rotation thereabout, and elongated applicator means which engages the inner surface of the hollow screen and which is supported by the elongated inner support means. Pressure adjusting means are carried within the interior of the hollow screen, comprising a plurality of individually inflatable elongated tubes positioned behind the elongated applicator means. In one embodiment, the outermost tubes extend beyond the extremities of the applicator means.