Abstract: A screen printing method and apparatus for printing a circuit pattern corresponding to that of a stencil (4), onto a print-object article (1) placed on an ascendable/descendable positioning stage (2), through moving a squeegee (5a,5b) horizontally while the squeegee is pushed in on the stencil so that print paste (9) is printed to the article via the stencil. The squeegee is lifted to an extent of a push-in stroke, to which the squeegee has been pushed in on the stencil, and thereafter the article is separated away from the stencil by moving the stage downward. The board is classified into first and second areas (121,120) where values of opening sizes of the stencil along a squeegee moving direction are smaller than and not smaller than a threshold, and a speed of the squeegee at the first area is made slower than that at the second area.

Abstract: An elongate, rigid blade holder has in its outer surface an elongate slot which is rectangular in cross section. An elongate, flexible squeegee blade has a first portion thereof extending downwardly into said slot and snugly between the sidewalls thereof. The remaining portion of the blade projects upwardly out of the slot and beyond the outer surface of the holder and has formed thereon at least one longitudinally extending printing edge. Each sidewall of the slot has formed in its upper edge a longitudinally extending recess opening on the outer surface of the holder and on opposite sides of the blade. Each of said recesses has an elongate, flexible blade locking rod removably press fit therein and frictionally engaged with the confronting side of the blade thereby removably securing the blade in the slot.

Abstract: A process of forming a multi-layer feature on a ceramic or organic article in which first and second layers of paste are sequentially screened through a screening mask wherein the screening mask has not been moved between screening steps. A structure produced by this process is also disclosed.

Abstract: A screen printing apparatus and method for forming printed wiring on a substrate, such as a wafer. The apparatus includes a reservoir disposed beneath a screen having a plurality of openings forming a pattern thereon. Disposed within the reservoir is a printing paste. The screen is pressed into the printing paste such that convex structures are formed on the upper surface of the screen, and are printable onto the substrate. A wiper is also movably disposed within the reservoir, cooperating with the screen to establish contact between the screen and the substrate.

Abstract: A magnet bar for exerting an attracting force on a doctor, which is arranged above the magnet bar, of a screen-printing or coating device comprises an elongate top plate and an elongate magnet carrier which extends below and substantially parallel to the top plate and on which permanent magnets are arranged next to one another in the longitudinal direction. The distance between the magnet carrier and the top plate can be adjusted by means of a displaceable adjustment member, which is arranged below the magnet carrier, in order to adjust the magnitude of the attracting force. The magnet carrier is supported freely on the adjustment member and the weight of the magnet carrier with magnets or the sum of the weight of the magnet carrier with magnets and the force of at least one spring acting upon the magnet carrier in downward direction is greater than the maximum attracting force which can be exerted by the magnets on a doctor which is arranged above the magnet bar.

Abstract: A printing paste supply degree can stir up and knead past contained in a syringe extremely efficiently and extrudes the paste in a condition suitable for a screen printing through a discharge opening of the syringe. The paste supply device comprises a syringe made from specific resin and a mixer unit which is fitted on an inlet end portion of the syringe.

Abstract: The present invention provides a screen printing apparatus which is structured so as to simultaneously apply a creamed solder and an adhesive to a sheet of base plate or print a different pattern and further apply a printing agent at a different thickness, at a stage of a printing process, two mask frames arranged along a direction of transferring of a base plate, a position identifying camera for identifying a position of the base plate with respect to the mask being arranged above the mask frames so as to alternately move to an upper portion of each mask frame, a fixed supporting plate arranged above the mask frames so as to override them, two squeegee supporting plates mounted to the fixed supporting plate at an interval and being structured so as to move along the direction of transferring of the base plate, squeegees being mounted to the squeegee supporting plates, a table for mounting the base plate arranged below the mask frames and structured so as to move in the direction of transferring of the base

Abstract: A printing press (10) including a pallet arm assembly (20) having a first arm extension (26) and a second arm extension (28) and an adjustable coupling (30) therebetween. Adjustment of coupling (30) adjusts the lateral and vertical position of a pallet table (22) carried by the pallet arm assembly. The printing press (10) also includes an angularly adjustable press arm bracket mount (60) that is mounted on a rotatable wheel (16) that carries multiple press arm assemblies (18). Adjustment of the angular position of bracket (60) assists in lowering press arm assembly (18) into a yoke gate (36) mounted on pallet arm assembly (20). Press arm assemblies (18) also include over-center spring mechanisms (90) that place a coil spring in compression rather than tension and include an enclosure (104) for capturing the coil spring for increased safety.

Abstract: A screen printing machine with an improved device for aspirating excess ink, comprising a printing bed for supporting a glass plate to be printed, which is provided in an upward region with a frame with a mesh surface forming a permeable portion. Ink is placed on the frame. The machine has a doctor unit comprising a doctor and a complementary doctor whose dimensions are equal to the width of the frame and which are adapted to move along the frame from one end to the other in order to respectively distribute and collect the ink. The machine further comprises a suction unit provided with a suction nozzle and means for guiding the nozzle along a preset path. The suction nozzle moves on the mesh surface so as to follow the path traced by the perimetric edge of the glass plate in order to aspirate the excess ink.

Abstract: The present invention aims to achieve a screen printer which will not result in uneven printing which may occur depending on the printed positions. The moving position of squeegee is detected by the sensors. The pressure control unit adjusts a degree of opening and closing the valve depending on the moving position of squeegee, and adjusts the pressure P generated by the air cylinder. By decreasing the pressure P at center and increasing the pressure P at both edges of a work, the work is printed without any unevenness.

Abstract: A cassette for holding and dispensing a viscous material for use in an apparatus for depositing the viscous material onto a substrate through openings formed in a stencil positioned over substrate. The cassette includes a body having a base and interior defined by first and second side walls and first and second end walls substantially orthoganol to the base. The base has a plurality of apertures formed therein, and a cover plate adapted to slide within the interior of the body. The cover plate having a plurality of protruding members wherein each of the protruding members corresponds to and is aligned with a corresponding one of the apertures of the base.

Abstract: Provided are a stencil printing method and an apparatus therefor, in which a master having a low stiffness such as a single film may be transferred, in which a complicated mechanism for fitting and removing a plate is not needed and in which a degree of avoiding movement of a pressing roller to be in contact with the master can be minimized.

Abstract: A new ink deflector for a squeegee assembly for use in a printing operation having a screening surface is disclosed. The squeegee has a first and second surface, and a pair of opposite ends, and an attachment for holding the squeegee at a suitable operating angle relative to the screening surface. A pair of ink deflectors are provided which are each detachably positioned at an operating angle relative to the screening surface along an end of the squeegee. The operating angle of each ink deflector in the present invention is independent of the operating angle of the squeegee. Each ink deflector, which has a first surface, is designed to direct ink towards the center of the first squeegee surface. Additionally, the ink deflector has a second surface which directs ink toward the center of the second squeegee surface.

Abstract: A slide mechanism for a cantilever type screen-printing machine and a driving mechanism for elevating the slide mechanism are provided. The slide mechanism includes an elevating mechanism and a transverse sliding assembly both including members formed from aluminum extrusions and therefore having high rigidity and strength. The transverse sliding assembly is vertically adjustably connected to a guide block through two small slide pairs connected between the transverse sliding assembly and the guide block, and the guide block is in turn connected to two big slides of the elevating mechanism. The driving mechanism includes a gear reduction motor, a driving bar of which is connected to the guide block in order to drive the transverse sliding assembly to stably move up and down along the elevating mechanism at high speed to achieve high precision printing in high efficiency.

Abstract: Regarding filling of a paste, a temperature gradient at a paste-pressing face is managed by a heater incorporated in a filling head. Alternatively, a nonvolatile component is applied to a printing face of a base material before the paste is filled, thereby preventing a volatile component of the paste from evaporating with time. Viscosity of the paste is thus maintained. Meanwhile, a change of the quantity of the paste is coped with by changing a moving speed of the filling head or a contact angle of the filling head to the printing face, or by supporting the filling head at the side in touch with the printing face.

Abstract: The system comprises two oppositely working scraping blades (8, 9) fixed to a blade support (6, 7) for depositing a silk-screen printing product (18) via a screen (17) on a support (21) to be coated. According to the invention, each extremity of the blade support comprises means (28, 29) for fixing a cheek for confinement of the product. The cheek (24, 25) is a plate of flexible material which engages the screen (17) by means of its free edge, with a small spacing being saved between the blade and the plate. The plate is oriented in such a way that the silk-screen printing product (26, 27), which passes beyond the extremity of the blade during its passage under pressure on the screen, is brought back to within the screen in the work zone of the blade.

Abstract: A creamed-solder printing machine for printing a creamed solder on a printed circuit board, including a screen having a plurality of holes, a squeegee which prints the creamed solder on the printed circuit board through the holes of the screen, a frame which supports the squeegee such that the squeegee is movable toward, and away from, the screen, and an elastic member which is provided between the frame and the squeegee and which produces a biasing force to bias the squeegee in a direction toward the screen.

Abstract: An attachment system for a silk screen printer includes an elongated support bar having a pair of offset holding heads with aligned openings formed therein. A pair of elongated blade elements are slidably held in aligned openings in the offset holding heads, and include open areas for releasably supporting first and second spaced-apart and angled squeegees.

Abstract: A doctor blade for use in screen printing includes a head, a base in the form of a lip and at least one elastically deformable member connecting the head and the base. The elastically deformable member is structurally discontinuous on at least one location in the longitudinal direction of the doctor blade extending along a plurality of spaced spring layers. The elastically deformable member is realized from a plurality of elastically deformable wires which are arranged in spirals or in undulations or from a cut-out sheet so as to form a double comb the stiffness of which is controlled by the transverse dimension of the windings, undulations, or cut-outs, or the characteristics of the constituent material, and the spacing between the teeth of the comb.

Abstract: In a screen printing apparatus and method for using a squeegee to press printing paste on a screen while moving the squeegee in the horizontal direction in order to apply the paste to a circuit board for printing, accurate printing with excellent printed shapes is provided by allowing the squeegee to flexibly fit the circuit regardless of its slope, swell, or warp to achieve balanced printing at a low specified pressure. To accomplish this, squeegees (26a and 26b) are elevated by an air cylinder (27) that can be rotated at the longitudinal center of the squeegees (26a and 26b) and that cancels their weight, and are then pressed downward by air cylinders (35 and 36) located symmetrically about the center in order to press the top surface of a screen (23).

Abstract: A dispenser for a surface mounting paste or the like comprises a substrate 12 and a plurality of nozzles 9, 10 and 11 attached thereto such that they can be vertically driven. The paste dispenser 8 is moved by means of a squeegee moving mechanism.

Abstract: A printing method and a printing device are provided, whereby a uniform amount of solder can be coated, printing quality can be improved, variations in adjustment between operators are eliminated, adjustment time is shortened, and productivity can be improved. By keeping the amount of deformation of the end sections of a squeegee constant by maintaining a uniform state of contact between the squeegee and a stencil, there is no occurrence of such problems as unsatisfactory wiping away of a solder paste, which causes the solder paste to be left on the stencil, incomplete filling of the solder paste into the pattern opening, or an increase in the deformation of the end sections of the squeegee, causing solder paste filled into the pattern opening to be scraped away.

Abstract: A method of screen printing raised three-dimensional images, for example, corporate logos, on printable textile and/or non-textile substrates involves the use of a stencil attached to the print side of the print screen. The stencil is made from a pre-fabricated, photosensitive thick film having a precision controlled thickness. The print screen is coated with a photosensitive emulsion, and the combination of the print screen and the attached photosensitive stencil blank are exposed to UV light from metal halide lamps to harden the non-exposed emulsion and stencil material. The screen and stencil are thereafter washed to remove the non-hardened emulsion and stencil material, thereby creating openings in the screen coating and stencil material to form a three-dimensional image volume. Pigmented paste is screen printed through the one or more image openings in the coated screen and the associated one or more image volumes in the stencil to form a three-dimensional image on the substrate.

Abstract: Providing encapsulated electronic components on a circuit board by providing dams on a circuit board around areas on which respective electronic components will be mounted, mounting the respective electronic components within the dams on the circuit board, and printing encapsulating material through a stencil in order to provide deposits of encapsulating material over the electronic components and within the dams.

Abstract: A dual track stencil system includes a first set of rails and a second set of rails, each of the rails being independently controlled for allowing for independent movement of circuit boards through the stencil system for processing. The stencil system includes a working area at which the circuit boards are stenciled and includes a stencil having two patterns formed thereon. In one embodiment, the stencil system includes a solder dispensing system for dispensing solder paste onto the stencil.

Abstract: In a screen printing method of squeezing out ink or a paste placed on a screen plate, which is obtained by forming a predetermined pattern on a metal or polymeric fiber mesh base with a photosensitive resin, onto a work placed on a side of the screen plate on which the ink or paste is not placed, by using a squeegee through the screen plate, thereby transferring the pattern onto the work, the distance between the work and the screen plate during movement of the squeegee by changing both the distance between the work and the screen plate on a stroke start side of the squeegee and the distance between the work and the screen plate on a stroke end side of the squeegee. A screen printing apparatus is also disclosed.

Abstract: A screening apparatus including a table for holding an article; and a dual reservoir dispensing assembly. The dual reservoir assembly includes first and second reservoirs for holding first and second materials to be dispensed; first and second nozzles in communication with first and second reservoirs, respectively, for dispensing first and second materials; tilting apparatus for tilting the nozzles in a first direction so that the first nozzle is tilted into position for dispensing the first material and for tilting the nozzles in a second direction so that the first nozzle is tilted out of position and the second nozzle is tilted into position for dispensing the second material; and apparatus for moving the dual reservoir dispensing assembly with respect to the table wherein, in operation, the first nozzle is tilted into position during a first movement across the article and the second nozzle is titled into position during a second movement across the article.

Abstract: A method of screen printing is provided. The method includes the step of providing a squeegee for interacting with ink and a printing screen. The squeegee has a mounting head having an attachment portion and a blade mounting portion. The blade mounting portion is made of material resistant to change caused by interaction with the ink. A contact blade is detachably received by the blade mounting portion of the mounting head and adapted for interacting with the screen and the ink. The contact blade may be quickly and rapidly replaced, when needed, in order to maintain constant pressure on the ink.

Abstract: A curved surface screen-printing apparatus adapted to screen-print a to-be-printed object having a large radius of curvature. Concentric curved-surface guides having an equal radius of curvature are respectively provided on both side portions of a jig table on which a printing board to be bent and used as the to-be-printed object is placed. A squeegee head crossing over the jig table, and a screen plate mounting frame are provided in the apparatus. A pair of steel belts are used to connect a corresponding one of the guides to the frame. The belts of each pair are made to intersect each other. An end of each of the belts is fixed to a side end portion of a corresponding one of the curved surface guides as viewed from a side thereof. The other end thereof is fixed to a corner portion of the screen plate mounting frame. A reciprocating motion of the squeegee head causes the screen plate mounting frame to perform a rocking motion along the curved surface of the jig table.

Abstract: Printing systems and processes are described. In a preferred implementation, a print system includes a platen, a print device and a print substance vibrator. A substrate upon which printing is desired is placed on the platen and the print device is placed operably adjacent thereto. A print substance is applied over the print device and through at least one perforation in the print device and onto the substrate. In one aspect, the print device comprises a screen and the print system is configured for screen printing. In another more preferred aspect, the print device comprises a stencil and the print system is configured for stencil printing. The print device and substrate are then separated from one another while a vibrative force is imparted to the print substance by the print substance vibrator.

Abstract: There is disclosed a solder paste screen printing apparatus and a solder paste screen printing method, in which a force of pressing of a squeegee can be adjusted delicately and accurately so as to effect the printing of solder paste with the optimum pressing force. A squeegee is connected to a lower end of a rod of a cylinder, and a load cell is provided above the rod. A first pressure and a second pressure are applied respectively to an upper chamber and a lower chamber of the cylinder. A load, applied to the load cell, is measured while varying the level of the first pressure, and the pressure measurement for the pressing force is effected in accordance with the measured load. In accordance with this result, the instruction pressure for the cylinder, which is necessary for obtaining the optimum pressing force, is determined, and then the printing of solder paste onto a substrate is started with this instruction pressure.

Abstract: A method and apparatus for automatically adjusting the location of a screen frame holder of a silk screen printing head in the x-axis to maintain accuracy in registration of color-to-color in a multi-color printing process due to the inaccuracies in indexing of an indexing transport member.

Abstract: An apparatus for printing a printing material on a substrate, such as a printed circuit board includes: a squeegee which extends in a first direction parallel to a plane screen and which slides on the screen to squeeze the printing material into through-holes of the screen; and an outlet-defining member which is opposed to the squeegee and which cooperates with the squeegee to define an elongate printing-material outlet. A printing-material container has a printing-material chamber which extends parallel to the printing-material outlet, has a length substantially equal to a length of the outlet and communicates with the outlet over a substantially entire length thereof. A printing-material thrust member is provided in the printing-material chamber such that the printing-material thrust member is substantially fluid-tightly movable relative to the printing-material container.

Abstract: The apparatus may be used with printing apparatus in which a media spreading member, such as a squeegee, moves relative to a surface, causing printing medium to be moved across said surface. The printing medium can be electrical solder paste and the surface can be a stencil. The apparatus is used for measuring linking parameters that are related to mechanical properties of the printing medium and the printing environment, such as viscosity and coefficient of friction. The apparatus comprises means for measuring a machine parameter that represents the force experienced by the media spreading member and means for resolving the measured force parameter into components equivalent to two orthogonal components, typically normal to the surface and tangential to it in the direction of relative motion. The apparatus also includes means for measuring a machine parameter that represents the velocity of the media spreading member relative to the surface.

Abstract: To prevent a positional displacement of a screen mask in accordance with movement of a squeegee, a single squeegee device and a printing agent feeding device moves in synchronism with each other along a guide member. A squeegee elevated/lowered at a predetermined timing is mounted at a lower end of the squeegee device. A printing agent scraping device is mounted at a lower end of said printing agent feeding device. The printing agent scraping device is structured by a scraping frame which is elevated and lowered at a predetermined timing and moves in a direction in contact with or away from the squeegee and a printing agent extruding plate which is retracted/projected at a predetermined timing within the scraping frame.

Abstract: A squeegee blade comprising a base metal core coated with titanium nitride. Preferably, the blade also comprises a nickel coating between the base metal and the titanium nitride. The core blade is provided with an edge with a desired radius of curvature by chemical milling, and then the whole blade is chemically polished or electropolished and optionally nickel plated to produce a very smooth finish. The blade is then coated with titanium nitride to produce a blade with an extremely hard, low-friction surface. A squeegee incorporating the blade can be used, for example, for screen printing solder paste, conductive epoxy, or the like onto printed circuit boards.

Abstract: A printer for printing a viscous material at predetermined positions forming a pattern on a substrate. The printer includes a frame, a device having a number of perforations arranged to form the pattern, a support apparatus that supports the substrate in a printing position, and a material dispenser having a substantially cylindrical chamber to contain the viscous material. The chamber has an opening through which the material is dispensed. The material dispenser is positioned over the device and constructed and arranged to dispense the viscous material through the perforations in the device onto the substrate. In embodiments of the present invention, the material dispenser is adapted to receive standard cartridges containing the viscous material, and the printer further includes a pressurized air source for forcing the viscous material from the cartridges into the material dispenser and from the material dispenser through the perforations on the device and onto the substrate.

Abstract: An exposure frame (30) and a registration printing pallet (130) are disclosed for registering a printing screen frame (10) holding a screen (12) first to the artwork (4) and next to the pallet (19) supporting the product (T) to be screened.

Abstract: An apparatus for dispensing solder paste for application through a stencil or a screen to a circuit board includes a housing having an elongated chamber along a longitudinal axis and a rotatable member within the chamber. The housing has an inlet connected to a supply of solder paste and an elongated opening at the bottom of the chamber for delivering solder paste from the chamber. The rotatable member creates a pressure gradient within the chamber and causes delivery of the solder paste through the opening at controlled pressure. The rotatable member is spaced from an inner surface of the housing defining the chamber. The axis of rotation of the rotatable member is movable in two directions and the speed of rotation is adjustable. The forces on the rotating member are monitored in order to monitor solder conditions.

Abstract: A screen printing apparatus in which alignment marks are provided on the screen and the printing material. The marks are detected accurately and clearly by an alignment mark detector located between the printing material and the screen.

Abstract: A high speed screen printing machine (20) is provided for accurately imprinting images on segments (205) bearing indicia (206) of a transparent web (34, 36). The machine (20) includes a vacuum platen (24) which is transversely adjustable to accommodate webs of differing widths, a camera assembly (28) beneath the platen (24) and indicia (206), and an X, Y, .theta. adjustable frame (30) supporting an upper screen frame support assembly (32) adapted to hold a printing screen (208) provided with reference indicia (212). When a segment (205) is initially positioned and held by platen (24), the camera assembly (28) is used to generate a combined image of the indicia (206) through the segment (205) and the screen reference indicia (212); a microprocessor controller uses this data, together with positional information establishing the location of the screen frame support assembly (32), and activates the three-motor adjustment frame (30) for simultaneous X, Y and .theta.

Abstract: Disclosed is a screen printing machine which has a first driving mechanism for moving a squeegee movably arranged above a screen along its surface. The printing machine has a second driving mechanism for lifting the screen from a printing material by an upward rotation of its first edge around its second edge. A controller controls the first and second driving mechanisms to operate in association with each other.

Abstract: There is disclosed a screen printing apparatus comprising a squeegee arranged above a screen in a manner opposed to the screen, the squeegee being supported such that the squeegee is movable in a vertical direction and at the same time movable in a direction of printing of a printing material, a plurality of urging devices arranged on a supporting frame supporting the squeegee in a manner suspended therefrom, for urging the squeegee toward the screen, an urging force-detecting device for detecting urging forces of the urging devices during movement of the squeegee for printing, and a first control device for controlling the urging devices based on results of detection by the urging force-detecting device to adjust urging forces applied by the urging devices to the squeegee.

Abstract: A screen printing machine has a drive mechanism for moving printing platens along an endless horizontal path through successive printing stations and a printing screen carried by a printing head above the endless path at each printing station. A platen alignment mechanism at each printing station has locating members movable vertically into and out of engagement with freely rotatable rollers on the platen supports. A screen positioning mechanism at each printing station has screen holders engageable with opposite sides of screens, and the screen holders each comprise a screen support mounted for pivotation to and fro between a position beneath one of the screens. A lifting system at each printing station has supports positioned to support opposite ends of one of the printing heads and a support drive mechanism operable to simultaneously raise the supports.

Abstract: A clamping assembly for a squeegee blade used in solder paste application. The assembly comprises a holder having referencing pins to position the blade. A clamping bar secures the blade to the holder. A recess is formed between the holder and the clamping bar. When a new blade is inserted, any paste contaminating the assembly is pushed into the recess ensuring both accurate blade positioning and clamping force.

Abstract: A dual track stencil system includes a first set of rails and a second set of rails, each of the rails being independently controlled for allowing for independent movement of circuit boards through the stencil system for processing. The stencil system includes a working area, at which the circuit boards are stenciled. A stencil, having two patterns, each aligned with a respective working area of each track is suspended above the dual track system. A solder dispensing unit including a squeegee arm is suspended above the stencil, parallel to and centered between the two tracks. During operation, a circuit board enters the working area, is raised to engage with the stencil, and the squeegee arm traverses that portion of the stencil pattern currently engaging the board, thereby dispensing solder through the pattern and stenciling the board. The stencil system operates to process two boards on one track before advancing to the second track for processing another pair of boards.

Abstract: A method for applying solder paste on tape carrier package component sites of a printed circuit board is disclosed. In accordance with a method and system of the present invention, a stencil having multiple openings for each device pad on the printed circuit board is provided. Each of the openings is approximately 0.012".times.0.0053" in size. The stencil is then secured in a fixed position directly above a printed circuit board. Finally, solder paste is selectively applied to the printed circuit board through the stencil with an applicator.

Abstract: An apparatus for cleaning a screen of a screen printing machine, including an ultrasonic vibrator which vibrates at an ultrasonic frequency, a cleaning-sheet supporting device which supports a portion or an entirety of a porous cleaning sheet between the screen and the vibrator, such that the portion or entirety of the cleaning sheet is contactable with the screen and the vibrator, and a washing-agent supplying device which supplies a washing agent to the cleaning sheet.

Abstract: Semi-automatic screen printing equipment for multi-color printing of cylindrical objects wherein precise color-to-color registration may be achieved. A programmable color sensor, photoelectric system using fiber optics is preferably employed for reading a color image reflection from a rotating object and feeding a resulting signal into a pre-programmed color selector for providing an electrical signal to an electric clutch. The electric clutch engages a mechanical interlock drive between the screen printing plate and the object for precise color to color registered printing. A fixture is used for rotatably supporting an object to be printed. A screen and a squeegee for contacting the screen are used to force printing material through openings in the screen for application to the object surface. A first rotatable shaft is connected to the fixture, and a second rotatable shaft is provided. Clutch means connect these shafts for engaging and disengaging driving action therebetween.

Abstract: A vertical screening apparatus in which the a circuit board in transported into and out of a print zone before and after vertical reciprocation of flood blades, spot suppressor squeegee, and print squeegee. A spot suppressor squeegee is provided to smear dots of ink residing on the inside a screening membranes after a previous circuit board has been screened.