Abstract: An adjustable squeegee holding device for a silkscreen printing frame, which when installed upon the rear frame member of a silkscreen printing frame provides a convenient place to support and retain an inked squeegee when the same is not in use during silkscreen printing operations as well as additionally providing a silkscreen printing frame counterbalance means when the frame is in a raised position.

Abstract: The ends of rotary stencils are attached to an attachment ring which is coupled to a drive element on the printing press by means of a universal joint, in the form of a gimbal, so that mis-alignment of the attachment ring with respect to the drive axis of the printing press will not cause distortion of the stencil, during rotation, thus stressing the stencil and causing inaccuracies in reproduction of the pattern to be printed from the stencil. The operating elements of the universal joint, or gimbal construction is preferably protected fron ink, and contamination by means of O-rings, or the like; the connection between the universal joint and the stencil end ring is a bayonet-type cam-recess quick-release connection.

Abstract: A dyestuff applicator, located inside a cylindrical printing screen, comprises a horizontal tube which supports an axially extending dyestuff-distributing member immediately overlying the inner screen surface. The distributing member, or at least a membrane-shaped bottom thereof, is under pressure of the liquid dyestuff supplied to the tube at a superatmospheric pressure equivalent to a head of at least 1000 mm water. To insure full effectiveness of this pressure over the length of an outlet zone in the bottom of the distributing member, the body of liquid overlying that zone within the applicator should have a cross-section exceeding in at least one dimension 1.5% of the length of a flow path as measured from a point of entry of the dyestuff into the space containing that body of liquid.

Abstract: An undercutting apparatus for removing ballast and other material from beneath railroad ties, particularly ties in areas that are difficult to undercut with conventional equipment. The apparatus includes a carrier capable of moving over ordinary ground. An undercutter in the form of a toothed chain moving around the periphery of a plate member is rigidly mounted to a first frame member. A drive motor is provided for driving the chain by means of a sprocket. The first frame member is mounted on a second frame to pivot about a vertical axis with respect to the second frame. A motor and interconnecting gears are provided to pivot the first frame member as desired. The second frame is mounted on a travelling frame mounted on a vertically oriented track frame. Hydraulic cylinders pivot the second frame means as desired. The track frame is mounted to the carrier to transport the undercutter and provide it with the necessary power.

Abstract: A screen printing machine wherein one end of a rotary stencil is driven by a power train which receives torque from a motor. The other end of the stencil is driven by the power train through the medium of a cylindrical squeegee which is disposed in the stencil and drives an idler gear in the frame of the machine. The idler gear rotates a gear which drives the other end of the stencil. The ends of the stencil are coupled to driving sleeves which are rotatable in discrete bearing members each of which is adjustable relative to the machine frame. That bearing member which receives the driving sleeve for the one end of the stencil is pivotable in the frame about an axis which is normal to the axis of the stencil and is also movable in the axial direction of the stencil. The other bearing member is pivotable in the frame about an axis which is normal to the axis of the stencil and is also movable transversely of the axis of the stencil.

Abstract: A stencil printing, coating or coloring machine has a flexible hollow metal cylinder in contact with the stencil, and a perforate strip in the area of contact between the stencil and cylinder. The ends of the cylinder are sealed by deformable covers, and the interior of the cylinder is at least partially filled with printing, coating or coloring material.

Abstract: A key for an electronic keyboard comprises a plunger in a body which is mounted on the keyboard chassis and striker, with a helical spring within the plunger for engaging the striker. To provide required tactile characteristics, a further spring means, e.g., a bowed diaphragm, is arranged between the plunger and the striker and also a snap-action spring is arranged between the plunger and the body.

Abstract: For screen printing, the screen is manufactured and used for printing in a single box. The screen material is coated with a delayed light sensitive emulsion, dried and assembled with a film opaque positive on the outer surface of a glass plate forming one side of the box for exposure to a flood light within the box, with the emulsion delay permitting assembly in normal environment light; the screen may be held down by a resilient foam layer, rigid plate and U-shaped member adjustably secured to the box for this purpose and further to serve as a carrying handle. Thereafter the exposed screen is washed and placed adjacent the outlet of a blower inside the box for the purposes of drying (the emulsion is originally dried in the same manner).

Abstract: In an office machine keyboard comprising a plurality of keys formed by an array of areas of layer of elastic material, each key is provided with an identifying character in relief on an insert. The insert is embedded in the elastic layer so that the character is visible on the fingering surface of the layer, is surrounded by the material of the elastic layer and contrasts in color with the material. The insert is provided with internal passages. The elastic material engaging the internal passages forms struts interlocking the inserts in the elastic layer.The keyboard is formed by injection of a hot elastomer in a moulding die in which are positioned the inserts.

Abstract: An automatic sheet feeder for a tape driven typewriter includes a blank-sheet magazine and a filled-sheet magazine mounted above the platen. Sheet feed rollers are mounted to transfer the sheets to and from the platen and are coupled to a motor in combination with the typewriter platen. An electric clutch connects the platen to the normal line step drive. The clutch is disengaged simultaneously with energization of the motor so as to disengage the platen from the normal step drive during automatic feeding. A photoelectric encoder is coupled to the normal step drive and is activated to record the movement of the sheet through the typewriter. A presetable memory counter and a run counter detect a predetermined output of the encoder. The encoder is first connected to the memory counter. The first sheet is manually fed into the typewriter and the memory counter stores a record of the selected number of lines through which the sheet passes.

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 screen printing machine wherein the stencil rotates above a hollow counter-pressure beam having a rectangular profile and carrying a removable strip which engages the underside of the back cloth. The beam is stiffened by two tie rods which are adjacent to its side faces and extend through bearings affixed to the lower portion of the beam. Upward flexing of median portions of the tie rods is prevented or controlled by vertical bolts which mesh with brackets secured to the beam and whose lower end portions abut against flats on the median portions of the respective tie rods. The tie rods are tensioned by nuts so that they prevent the median portion of the beam from sagging under its own weight and/or due to pressure which is exerted by the central portion of the stencil through the medium of the fabric and back cloth.

Abstract: A mechanism which has a first cam plate pivotally mounted on an operating shaft having an operating lever joined thereto and a second cam plate pivotally mounted on an eccentric shaft of a master cylinder and moved with an arm fixed to the operating shaft. The first cam plate is formed with a pump switch cam, a set cam for operating the operating lever stepwise and a paper feed control cam. The second cam plate is formed with a form roller-separating cam and a master cylinder-separating cam. The form roller-separating cam causes press contact between a form roller and the master cylinder when the operating lever is set at the I position. When the operating lever is set at II, the master cylinder-separating cam forces the master cylinder to maintain its contact with a blanket cylinder, and when the operating lever is set at IV, the paper feed control cam allows a suction foot to move down to start paper feed through an auxiliary operating lever.

Abstract: A stencil printer has a base mounting an ink container and yieldable guides adapted to be traversed by a stencil carrier and a card carrier. The ink container has curved bottom and end walls and is spanned by a removable flexible plastic sheet confined by removable bearing blocks which journal the ends of roller shafts. The stencil holder releasably anchors a stencil in a manner convenient for removal and in proper printing position. The card carrier includes a card anchor spring urged to anchoring position and releasable incident to movement of the carrier to a releasing position. The device includes cushioning bumpers to deaden noise incident to operating movement of the device.

Abstract: A screen printing press having a support frame, a printing frame pivotally mounted on the support frame and angularly movable relative thereto, a carriage assembly mounted on a pair of spaced support arms mounted on the printing frame, a single drive arm pivotally mounted on the support frame and connected by a drive rod to the carriage assembly to move the carriage assembly relative to a printing screen during a printing cycle, and a carriage assembly actuating means having an actuator channel mounted on spaced parallel legs for movement toward and away from a support arm in generally parallel relationship thereto, an actuating lever mounted for movement along said actuator channel having one end attached to a parallelogram mounting bracket on the carriage assembly on which a squeegee and flood bar are mounted so that upon movement of the actuator channel, the positions of the squeegee and flood bar are reversed, and a control lever pivotally and slidably mounted on the support frame and operatively connecte

Abstract: In a doctor-blade system consisting of a strip of flexible material supported by a blade-holder fitted with resilient means for applying the free marginal portion of the doctor-blade against the screen during printing, at least one internal longitudinal passageway is formed within the blade-holder body and communicates at intervals with the internal blade face and with the resilient means, any trace of ink which may have infiltrated into the system being discharged to the exterior by means of an external supply of fluid under pressure.

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, 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 cylindrical printing roller combining a rubber mat printer and a stencil printer. The rubber mat portion is inked externally while the stencil portion receives its ink from internally of the roller. The two printing forms on the roller print simultaneously.

Abstract: A silkscreen printing machine, having a printing drum supporting material which is to be printed. Sensing means for indicating the position of the material are arranged on the drum, and an adjusting device is arranged to stop the front edge of the material at a predetermined position, in which gripper means grips the material.