Abstract: An improved type element mounting for a high speed type element positioning mechanism of the type which has a type head member having therein a plurality of type elements and a type head shaft on which the type head is mounted. The type head member has a spherical surface on which the type elements are mounted with the faces thereof on the sperical surface and movable in the type head member for being projected beyond the spherical surface. The type elements lie along latitudinal circles on the surface the centers of which lie on the axis of the type head shaft, and the type elements in adjacent latitudinal circles are substantially aligned along longitudinal circles extending from the point of intersection of the type head shaft axis and the spherical surface. The type head shaft is pivotally mounted for pivotal movement around a point corresponding to the center of the sphere of which the spherical surface forms a part.

Abstract: A print head for impact printers of the dot matrix type comprising a hollow die cast housing having solenoids mounted upon a rear wall thereof and having print wires driven thereby and extending through the rear wall and hollow housing toward the forward end. A plastic bearing is releasably mounted in the forward wall and serves as a low friction bearing for the reciprocating print wires and to prevent abrasive wear of the print wires when in the retracted position. The guide means mounted within the housing and intermediate the forward and rearward ends thereof support guide tubes for maintaining relative positioning of the print wires as well as maintaining their desired natural curvature.The plastic bearing is formed of a plastic material for significantly increasing operating life and which is compliant to attenuate a significant amount of side loading due to impact. The plastic bearings are admixed with additives to make the bearings self lubricating.

Abstract: The print head in a high-speed printer of the dot matrix type is provided with a bearing comprising an element fixedly attached to the front wall of a plastic block. The element is made of a material substantially harder than plastic, such as metal or a jewel. Guide passages extending through the element are aligned with similar guide passages in the plastic block and are axially directed towards a paper document. The forward end of the print head is provided with slots for receiving the plastic block which may be releaseably secured into position by means of a substantially U-shaped compliant brad, greatly simplifying both assembly and disassembly thereof.

Abstract: In a dot matrix printing head having a plurality of printing elements or styli each driven by an associated electromagnetically operated hinged armature, an adjustable spring arrangement for adjusting the preload biasing of each armature against an armature stop to insure that the associated electromagnets are matched with respect to flight time and can be set to deliver the proper printing force to each styli.

Abstract: A carriage having a print head thereon is traversed along a platen to enable the print head to print along a line of printing in a serial-type printer. The print head moves with the carriage and is also mounted thereon for independent movement towards and away from the platen. A leaf spring biases the print head towards the platen, and a sensing shoe, secured to the print head, glides along media of various thickness mounted on the platen to maintain the print head (like a wire matrix) a predetermined distance from the media enabling the print head to print on various thicknesses of media automatically.

Abstract: A typewriting device has a type-carrying drum including a plurality of cylinders arranged in end-to-end relationship on the axis of the drum and each carrying a plurality of type elements arranged in spirals. A typewriting paper positioned adjacent to the drum is intermittently fed by feed means for intermittently feeding the paper tangent to the drum. A plurality of hammer members are positioned opposite to the cylinders of the drum for moving toward and away from the drum, the space between the hammers being the same as that between the spirally positioned type elements, and drive means for rotating and axially moving the type-carrying drum, whereby each time each type element passes by its associated hammer member, the hammer member is actuated to effect one typewriting operation on the paper and thereafter, the typewritten paper is intermittently fed.

Abstract: A method and apparatus for controlling the print rate of a column-sequential dot matrix printer actuated by an input signal comprising a sequence of code words occurring at a given maximum input rate, a print head and a print head drive operating at a speed determined by the frequency of a print rate timing signal, and a multi-stage FIFO input storage register. A multiplicity of constant-frequency print rate timing signals are generated, ranging in frequency from substantially below to substantially above a normal print rate frequency Fn approximately matched to the input rate, and a variable print rate timing signal progressively increasing in frequency from well below Fn to well above Fn is also generated; these signals are applied to the printer in accordance with a predetermined schedule, determined by the number of code words in storage at the beginning of each spacing character cycle, and in accordance with a program affording relatively smooth acceleration and deceleration of the print head.

Abstract: A printer has a horizontal platen for supporting paper and a print head which moves horizontally opposite thereto during indexing operations and is driven toward the platen for character printing. The print head is mounted on a carriage bearing block acting as a linear bearing and having a passageway of complex cross-section resulting from the superimposition of a square and a circle. A controllably rotatable carriage shaft passes through the passageway of the block.

Abstract: An improved mechanism is provided for preventing long-term oil contamination of the print ribbon in a wire matrix printer. In the event that the print ribbon has an excess of oil thereon, it will cause the printed characters to be alternatively too light or too dark thereby reducing the print quality on the document. The print head of the wire matrix printer is operated to an idle or at rest position when printing is not being effected, a camming mechanism retracts the print head away from the platen and document. When this occurs, a stationary member on the printer carriage engages the ribbon and moves it away from contact with the print head in the vicinity of the apertures through which the print wires are guided for printing. With the ribbon moved away from the apertures, the lubricant oils on the print wires do not flow on to the ribbon. The retracting of the print head away from the platen and document by the camming mechanism also permits the easy insertion of new forms into the printer.

Abstract: The present arrangement provides a housing means in and upon which are mounted at least the paper advance tractor assemblies including the drive means therefor and the print hammers of the printer. In addition the housing means is formed to have an eccentric shaft pass therethrough which eccentric shaft is formed and disposed to move the housing means toward and away from the type font faces of the printer. The eccentric shaft is engaged in a gear relationship with a drive means that acts to rotate the eccentric shaft which actions imparts linear motion to the housing means assembly.

Abstract: A snap-action fastener assembly is disclosed, which provides ease of assembly and disassembly of a print disc to and from a serial printer. The snap-action fastener assembly comprises a necked shaft connected to the serial printer, and a pair of flexing jaws connected to the print disc. When pressure is applied about the jaws, they are caused to widen so as to easily slip over the shaft. When the pressure is released, the jaws snap back to a locked position. When the jaws are positioned about the necked section of the shaft in a pressure released condition, the print disc will be securely locked upon the shaft.

Abstract: A cultivator for attachment to the rear of a prime mover has a frame with a plurality of side-by-side soil-working members rotatably mounted on vertical shafts journalled in said frame. A power take off connection drives a crank mechanism and connecting rods interconnect the crank mechanism with arms on the shafts to oscillate the soil-working members in operation. Each connecting rod is connected to alternate soil-working members so that neighboring soil-working members oscillate in different directions. Each soil-working member preferably has four tines in cruciform configuration and a roller is adjustably mounted to the rear of the soil-working members to regulate the latter's working depth.

Abstract: A thermal print head assembly preferably for use with temperature sensitive impression material in a dot-matrix line printer includes a housing having a plurality of electrically actuatable means for impinging upon the impression material; means for guiding each of the plurality of impinging means to form a straight line at the housing front end and adjacent the impression material; and electrical means positioned within the housing for heating the impinging means without interfering with their movement through the frong housing end and being insulated from the housing to prevent excessive heating thereof. In a preferred embodiment, the electrical heating means is energized simultaneously with the motor of the line printer to maintain the forward ends of the impinging means at a temperature of the order of 300.degree.F. to allow printing on thermally activated paper.

Abstract: A high speed printer for printing desired letters, figures, signs, etc., on a paper by depositing ink particles on the paper after properly controlling ink droplets or selectively controlling corpuscles, characterized in that at least one ink mist passage is provided at a location closely adjacent to the surface of ink solution. An air feed port also is provided for introducing air into said ink mist passage after the air passes the ink mist source or its vicinity so that the produced ink mist will flow into said ink mist passage without forming any small convection.

Abstract: An apparatus and method for electrographically printing on a dielectric paper and transferring a toned image from the dielectric paper to plain paper. The dielectric paper receives an electrically charged latent image from an electrode device. The latent image is developed by applying a liquid or dry toner. The toned image on the dielectric paper is transferred onto the plain paper by conveying the dielectric paper and the plain paper together through a pair of conductive rollers. The dielectric paper is dried, fusing the residual image on its surface. The dielectric paper is then reused. The plain paper with the transfer image is dried, cut, and stacked.

Abstract: A wire matrix printer includes a print head having one or more banks of a plurality of generally horizontal, vertically spaced print wires arranged parallel to each other for linear reciprocation toward and away from a recording surface by associated actuators. The print wires in each bank are of progressively varying length so that the wire associated with the actuator furthest from the recording surface is the longest and each adjacent wire is a predetermined amount shorter than the preceding wire. Outer or actuator ends of the wires define a vertically spaced and stepped array. The actuators in each bank are also in an array vertically spaced and stepped and are respectively coupled to the outer print wire ends by armatures. The inner or printing ends of the wires define a vertically spaced, nearly planar array near the recording surface, and a spaced, planar array at such surface.

Abstract: A single element type carrier having type characters with different printing areas is impacted against a recording medium with different impact intensities substantially corresponding to the different printing areas to effect uniform printing. The type carrier is driven in a printing movement by a resiliently biased member which imparts an impacting force to the type carrier as the member moves along a path in response to the rotational movement of a cam. To control the impacting force imparted to the type carrier, one of a plurality of stop abutments is selectively positionable in the path of the resiliently biased member to control the length of movement along the path during which the member imparts an impacting force to the type carrier.

Abstract: A matrix printer comprising one or more identical groups of printing wires which are guided in ducts in stackable plates of synthetic material. In the case of a plurality of stacked groups, the distance at the area of the printing ends of the wires between two adjacent ducts in two different groups equals the distance between two adjacent ducts of the same group. Different paper widths can be accomodated and characters of different dimensions, curves, patterns and so-termed negative characters can be printed without movement of the groups.

Abstract: A typewriter power roll having a hollow core is assembled with end bearings which are adapted to rotatably support the power roll on a stationary center shaft. Assembling the core and end bearings as a unit allows the periphery to be ground concentric with the bearing axes. After grinding, the power roll can be located in a typewriter and the center shaft inserted through side frame openings and the bearings and adjustably secured to the typewriter side frames at opposite ends by being wedged between a slotted surface of an adjusting plate adjustably secured to the side frames and an eccentric mounted on the adjusting plate.

Abstract: A wire-matrix printer including a vertical column of essentially horizontal, generally parallel print wires arranged for substantially linear reciprocation along spaced, parallel printing axes. The print wires are of progressively varying length so that the lowermost wire in the column is the shortest and each successive higher wire is a predetermined amount longer than the preceding wire. Thus, the outer or actuator ends of the wires define a horizontally spaced and vertically stepped array. An array of horizontally spaced and vertically stepped electromagnetic actuators is provided, as is means for flexibly coupling each print wire to an armature portion of the actuator.Each electromagnetic actuator includes a flat, generally T-shaped armature, preferably a spring reed, and a flat, generally C-shaped magnet core. The core and reed are mounted generally parallel to each other, with the crossarm of the T facing and overlapping pole face portions defined at the inner tips of the arms of the C.