Abstract: A duplicating apparatus is equipped with a photoconductive modulator screen cylinder for making reproductions of a graphic original on a dielectric receiving medium utilizing aperture-controlled electrostatic printing techniques. Means is provided for creating a charge distribution system on the surface of the modulator corresponding to an image to be reproduced from the graphic original. The apparatus also comprises charging means for projecting gas ions against the modulator screen cylinder, electrode means for collecting the gas ions selectively transmitted by the modulator screen cylinder on the dielectric receiving medium and means for developing the dielectric receiving medium to create a visible image.

Abstract: A machine for printing on thin-walled frusto-conical containers having little resistance to transverse deformation is provided with rotatable mandrels for holding and centering the containers during printing. Each mandrel has a rotatable body provided with two axially spaced centering rings adapted to engage the walls of the container and centralize the container relative to the axis of the mandrel upon axial movement of the container on to the mandrel. The centering rings make sealing engagement with the walls of the container and subdivide the space enclosed between the container and the mandrel body into an end chamber between the base of the container and the outer end of the mandrel, and an annular chamber between the side wall of the container and the mandrel body.

Abstract: A device for rolling up onto a core a stencil or ink screen being removed from a duplicator, in which means alongside the or a duplicator cylinder for supporting a core and for driving it at a peripheral speed in excess of the peripheral speed of the duplicator so that a stencil or ink screen from the duplicator may be unrolled from the cylinder and onto the core with tension in the stencil or ink screen maintained by virtue of slipping drive to the core.

Abstract: This invention relates to a device for releasably mounting thin walled cylindrical members in a machine involving rotary working operations, such as rotary screens used in rotary printing presses. The device comprises cylindrical end members adapted to be mounted on the rotary machine and adapted to fit within and engage inner peripheral flanges at the ends of the cylinder. The end members comprise an annular slot which contains a ring member expandible by suitable pressure means. Each ring member contains an outer annular groove adapted to engage the inner flange at each end of the cylinder upon expansion of the ring member thereby securing the ends of the cylinder on each end member. The ring member can be a steel band expandable by the action of a pressurized air tube mounted in the annular slot, or alternatively, the ring member can be an outer wedge ring disposed in the annular slot with an inner wedge ring in the slot which can be axially moved and thus radially moving the outer wedge ring.

Abstract: A hand-held, manually-operated device for dispensing a viscous liquid in conjunction with a wiping action. Downward pressure on a handle causes expression of viscous material through one or more perforations or orifices in a flexible seal which is in abutting relationship with a surface to which the material is to be applied. As the device is slid across such surface the flexible seal provides both a sealing and a wiping action. When downward pressure is released, an expansion gap is created within the device, thereby relieving expression forces.

Abstract: On each of its sides, the fabric or mesh of a printing screen is clamped by clamping means which can be drawn outwardly to stretch the fabric. So that the stretching of the fabric in one direction will not be hampered by the clamping means for the other direction of stretch, the clamping means for each side includes floating clamp portions which may separate from one another longitudinally of a pull bar by which they are carried. The pull bars are drawn outwardly (with all of the clamps thereon) for stretching the fabric. The tendency toward troublesome distortion of the strands of the fabric, and the danger of tearing the fabric (even if of metal) are thus substantially eliminated.

Abstract: An endless printing screen is trained about two or more guide rollers for traveling an endless path. Abutment members in form of longitudinally continuous or discontinuous elements are mounted on the respective lateral edge portions of the screen, extending from one of the screen surfaces. Tensioning units are mounted adjacent these edge portions and are provided with grooves through which the abutment members travel. Each tensioning unit at one of the lateral edge portions is connected with a tension unit at the opposite lateral edge portion by an arrangement which makes it possible to move the tensioning units apart from one another in direction transversely of the travel of the printing screen, thereby tensioning the printing screen. The thus-connected tensioning units can also be moved in toto in direction transversely of the travel of the printing screen.

Abstract: A printing table with adjustably positionable, work-engageable reference pins which comprises discs rotatably mounted on the table with the top surfaces of said table and discs being coplanar; each disc having a groove within which a reference pin-carrying block is slideably disposed; and with there being latching components for respectively locking the discs and the related blocks in relative selected position. The table may also be provided with grooves and cooperating reference pin-carrying blocks.

Abstract: In a screen process printing machine, one edge of the doctor blade is firmly held in position against a supporting member. A rigid U-section supporting bar which is secured to the supporting member at one or two points bears on the top face of the active edge of the doctor blade, thus ensuring that the active edge is applied against a rotary cylindrical screen under uniform pressure.

Abstract: An apparatus for silk screen printing of circuit boards is provided which comprises a motor driven shaft having three cams keyed thereto which control the positioning of a silk screen and the movement of a squeegee. The latter is controlled relative to the screen so that the squeegee makes forward and return printing movements over the screen so as to print two circuit boards per shaft revolution. Two of the aforementioned cams respectively drive first and second slide members. The second slide carries the squeegee and is mounted on the first slide at right angles thereto. The first and second slides cooperate so as to cause the movement of the squeegee to describe a pattern roughly in the shape of a figure eight as the squeegee comes into printing engagement with the screen and then is lifted over and behind the inking compound at the end of both the forward and return printing strokes.

Abstract: The disclosure relates to item or document signing apparatus for imprinting a legally acceptable signature and/or date, etc., upon individual items or documents fed on demand thereto at high speed from an input to an output hopper in a stop-start operation. An adjustably positionable item stop mechanism permits the printing of the data at selectable locations along the longer dimension of the item. Both date and signature imprinting means are simply efficiently and easily demountably removable and replaceable permitting alteration and/or rapid change of the imprinted data. Novel to be automatically maintained regardless of document thickness.

Abstract: A squeegee roller rotates in contact with a surface to be treated. A sump of liquid or viscous material is upstream of the squeegee roller. A plate element has a seal in contact with the upstream side of the squeegee roller along the entire length thereof. A lowermost edge of the squeegee roller is spaced from the surface to be treated.

Abstract: A lithographic duplicating machine includes a device for feeding an imaged master from a stack of masters through a treating unit, containing conversion fluid for converting the imaged surface of the master, to a master cylinder. A motor drive system is provided for conditioning the master cylinder for operation at a printing speed and a starting speed for drawing the master through the treating unit. The motor speed is controlled by an electronic switching arrangement which receives input signals from machine responsive electrical switches and manually settable potentiometers to which the motor drive system is connected.

Abstract: A feed and takeoff assembly particularly adapted for use in connection with a printing press to automatically transfer generally flat stock from a first position to a print position and to a delivery position, having a frame, a transfer carriage mounted for movement along the frame, a single elongated feed gripper mounted near one end of the transfer carriage and disposed transversely to the path of travel of the carriage along the frame, and a delivery gripper mounted near the opposite end of the transfer carriage for movement therewith along the frame. The single elongated feed gripper is maintained in constant registered position during movement along the frame by a spring-biased cam-operated guide means. The delivery gripper acts to remove an entire sheet of printed stock at a desired time by a cam-operated opening and closing of upper and lower jaws mounted on a common pivot print.

Abstract: A carpet or fabric screen printer has a plurality of size-adjustable screen printing rolls mounted on re-positionable heads on a long frame for the purpose of repeating a pattern in different colors. Each printing head comprises a screen printing roll on which is mounted the screen and inside of which is mounted a roller of magnetically attracted material or having a magnet unit having both North and South poles along the length thereof. The magnetic roller rolls when the head is in operation but remains in one position with respect to the screen printing roll. A continuous conveyor belt delivers the fabric sheet beneath the screen and the roller inside the screen roll. A second magnetic roller on the head beneath the conveyor belt and on the other side of the conveyor belt from the screen and the second roller also has North and South poles which are attracted by corresponding opposite poles on the first roller.

Abstract: This disclosure is directed to a pallet locating and positioning apparatus for use on a screen printing machine having an oval track about which a series of pallets supporting work pieces are indexed from station to station. An internal surface of a side rail of a hollow rectangular pallet engages outwardly biased detenting fingers which are affixed on adjacent parallel lateral edges of a pallet base plate driven about the endless track of the screen printing machine. One finger engages a complementary shaped notch in the side rails accurately detenting the pallet along the longitudinal axis of the pallet base plate.

Abstract: A doctor blade device particularly for screen printing machines preferably for textile printing on webs of material, which comprises a metallic stroke lip leaf for the coating of flowable color materials on flat webs of material, and means for providing different supporting conditions over a freely projecting length of the stroke lip leaf.

Abstract: Document feeding and/or printing mechanisms including a support for a stack of documents to be printed, a rotatable printer, a feed mechanism for moving successive documents to the printer from the supported stack, and a document stacker on the opposite side of the printer for receiving documents and stacking them after the desired indicia has been printed on them.

Abstract: A group of cylindrical printing screens, rotatable about parallel axes, are journaled on a machine frame and carry coaxial gears in mesh with driving pinions on the frame. A bed, designed to support a substrate to be imprinted, is supported underneath each screen on the frame through the intermediary of elevation-adjusting wedges interlinked by a control rod. The sceens can be axially tensioned by mounting units, slidable on axially extending guide rods, which carry spring-loaded thrust bearings acting in an axially outward direction upon their coaxial gears.

Abstract: A two-part tooth for the scoop of an earth-moving machine, the tooth comprising a first tooth element adapted to be attached to one side of the bottom wall of the scoop and a second tooth element adapted to be attached to the other side of the bottom wall of the scoop. The two tooth elements are provided with interengaging parts by means of which they are linked together to resist separation. They are also bolted together through the wall of the scoop. One of the two tooth elements has a projecting tooth and serves as a removable tip, the other tooth element remaining in position on the scoop.