Abstract: In a method and apparatus for high speed printing, an image of a character is directed onto a charged photoconductive disc so as to cause discharge of an area of the circumferential periphery of the disc corresponding to the character. Toner is applied electrostatically to the discharged area to provide adherence. The disc is moved relative to, and in contact with, a receiver such as a sheet of paper on a roller. The disc is rotated at a constant speed corresponding to a rate of linear translation of the disc relative to the receiver, such that there is no relative movement at the point of contact. The toner adhered to the disc is transferred electrostatically to the receiver at the point of contact, and is thereafter fixed on the receiver by a fixing means which travels with the disc and at a spacing behind the disc.

Abstract: An apparatus for securing a typewriter, includes a locking device for locking an outer case in a closed position and a fastening device for fastening a bottom plate of the case to a mounting base. When opened, the cover permits a portion of the bottom plate to be exposed. The fastening device is brought, from inside the case, into engagement with the bottom plate of the case through the exposed portion of the bottom plate, thereby locking the typewriter to the mounting base. The fastening device for the bottom plate cannot be released unless the locking device is unlocked by a key to open the cover. Accordingly, only a keyholder can unlock the locking device, thus preventing the typewriter from being stolen. Further, since the fastening device is engaged with the bottom plate of the typewriter case, the outer appearance of the typewriter is not degraded.

Abstract: A control mechanism for disabling selected driven ink metering elements in rotary printing machines from a central remote control station is disclosed. The control includes plural command switches which are operated to provide control signal inputs to a programmable microprocessor. The microprocessor is connected to the drive circuits for the individual ink metering elements to position them in response to the selected control signals to increase or decrease the amount of ink supplied by each element individually or jointly, and to disable selected ink metering elements by moving them to a zero position so as to select the width of the printing area.

Abstract: A paper feed and drive mechanism for use in a high speed printer comprises a pair of arms which may be selectively positioned in a first lowered position, or in a second raised position. When the arms are in the lowered position, a line of contact is formed between a pressure roll and a drive roll and a narrow printing gap is formed between the platen and the inked ribbon. Spring means bias the pressure roll onto the drive roll and clips mounted on the arms hold the arms in the lowered position against the bias. Allowing the arms to raise to a second position in response to the spring bias creates a gap between the pressure roll and the drive roll and a wide non-printable gap between the platen and the inked ribbon. Additionally, a narrow tear bar slot formed between a fixed saw tooth tear bar and a backing plated attached to the arms opens to form a wide space when the arms are raised. The wide space eliminates the necessity to thread the paper tape through the narrow tear bar slot.

Abstract: A magnet strip extends along one generator of a printing drum of a rotary stencil printing device. A clamp strip, made of a material which is magnetically attractable, is hinged to said printing drum along a line substantially parallel to said one generator thereof, near one side of said magnet strip, so that said clamp strip can be pivoted either so as to lie against and along said magnet strip, with a leading edge of a stencil master for stencil printing interposed therebetween so as to clamp the leading edge of the stencil master to the printing drum, or so as to be removed from said magnet strip so as to release the stencil master. Thereby the stencil master can be conveniently retained to the printing drum in a manner which is suitable for automation, and does not require any reinforced lug portion along the leading edge of the stencil master.

Abstract: A hammer module (11) for a dot matrix line printer including a cantilever mounted multi-arm hammer (23) formed from a single piece of resilient ferromagnetic material is disclosed. The multi-arm hammer (23) comprises a plurality of hammer arms (25) each including a thin spring region (51) and a thick head region (53) that lie in a plane that forms a slight angle with the plane of the base (27) of the multi-arm hammer (23). Each module also includes magnetic circuits for each hammer arm (25) formed by a common permanent magnet (13), a post (19), an arm (29) of a flux plate (15) and an arm (33) of a return plate (17). The post (19) is mounted on the tip of the flux plate arm (29). The flux plate and return plate arms (29 and 33) lie in parallel planes located on opposite sides (poles) of the permanent magnet (13).

Abstract: A plurality of adjustment screws are supported on an adjusting device mounted in a recess in the outer periphery of a cylinder of a sheet-fed rotary printing press, and threadedly extend through an adjustment bar extending axially of the cylinder. A gripper pad bar on which gripper pads are mounted is disposed radially outwardly of the adjustment bar in contact therewith. The gripper pad bar and the adjustment bar are held against each other through their contact surfaces which are complementarily slanted. Rotatable movement of the adjusting screws causes the adjustment bar to displace the gripper pad bar radially outwardly or inwardly for stepless adjustment of the height of the gripper pads in conformity with the thickness of a sheet of paper without having to remove the gripper pad bar and other parts.

Abstract: In a printing apparatus with a correction ribbon, a ribbon placement mechanism comprising a holder swingably supported on a carriage adapted to move along a printing line and holding a printing ribbon and a correction ribbon; a first lever supported on the carriage so as to be swingable between a first position and a second position; a first electromagnet for shifting the first lever from the first position to the second positon; a second lever supported on one end of the first lever so as to be swingable between a working position and a resting position; a second electromagnet for shifting the second lever from the resting position to the working position; and a coupling means coupling one end of the second lever with the holder, wherein the printing ribbon is selected and placed at a print position through operation of the first electromagnet, while the correction ribbon is selected and placed at the print position through the swing motion of the holder when both the first and second electromagnets are actu

Abstract: A device for zone-wise metering of ink on an ink duct roller of an inking unit for printing presses, with an ink knife sealed against flowthrough of ink and subdivided zone-by-zone into adjacent elements having respective mutual joints therebetween, which includes respective actuators located in vicinity of the mutual joints between the ink knife elements, the actuators being operable upon the respective two neighboring ink knife elements on either side of the respective mutual joints for varying zone-by-zone the width of a gap located between the ink knife and the ink duct roller.

Abstract: A deposit container for printers for the deposition of sheet-like data carriers which are delivered by means of a platen is pivotably disposed above the platen to permit selective sheet stacking in upwards or downwards sequence. A pair of transport rollers are arranged adjacent the accepting end opening of the deposit container to be spread apart during sheet introduction into the container and to be moved together to form a drive nip for the sheet after it has passed through the printing zone and lift it into the deposit container. Pivotal flap valves are mounted on the container walls, which are adjusted in dependence upon the pivot position of the deposit container to assist the deposition of the individual sheets.

Abstract: Apparatus for releasably attaching a daisy print wheel to a splined shaft of an angular drive such that the print wheel can be driven in angular rotation with substantially no backlash. The apparatus comprises a splined hub fixed to the print wheel and slidably engageable with the splined shaft and a holder mounted on the hub for movement between a locking position in which the hub is locked on the splined shaft with interference fit and a released position in which the hub with the holder thereon is slidably removable from the splined shaft together with the print wheel. The hub includes a plurality of angular segments of cantilever formation which are pressed into the spaces between the splines on the drive shaft with interference fit by the engagement of the holder in its locking position. The holder is axially movable on the hub in traveling between the locking and release positions and is not normally removable from the hub.

Abstract: In a rotary printing machine, an arrangement for mounting an applicator roller and a preceding roller in a fluid feed stream journals the applicator roller and the preceding roller to the printing machine frame with substantial bearing play, and spring loads the applicator roller against the bearing surface away from the plate cylinder.On passing through the cylinder gap the applicator rollers of inking, damping or varnishing units in sheet-fed offset presses are jolted both at the start and end of the gap. The resulting different flattening of the soft applicator rollers causes roller marks, which should be avoided. For this purpose the applicator roller and the preceding roller are braced against each other by springs, so that their bearing play is eliminated and the distance between shafts is constant. This condition is also maintained on passage through the gap. Conveyance of liquid between applicator rollers and the preceding rollers is thus constant.

Abstract: The inventor discloses a hammer assembly suited for use in generating impact for printers, such as printers using daisy-wheels. The assembly comprises an electromagnetic assembly for selectively producing an electromagnetic field across an air gap. A hammer element is slidably disposed in said gap so that it is biased in a rest position and moves toward another position when said field is activated.A damping assembly is provided to dampen the reciprocating movement of the hammer element. The damping assembly has a rigid element which collides with the hammer element to bring it to a stop at its rest position. A shock absorbing element is used to dissipate the kinetic energy of the element.

Abstract: A printing hammer drive mechanism for a printing apparatus, comprising a manual control member movably attached to a main frame, an electromagnet mounted on the main frame for movement relative to the armature thereof, linking means disposed between the control member and the electromagnet for changing the gap between the core and the armature of the electromagnet in accordance with the operation of the control member, and a member for transmitting movement of the armature from a rest position to a work position, to a printing hammer, wherein the impact force of the hammer can be suitably changed by operating the control member to change the gap between the core and the armature of the electromagnet.

Abstract: An arrangement for securing impression as well as skew adjustment of one cylinder relative to another in a printing press. One of the cylinders has a bearing assembly occupying a cylindrical opening in the press frame. The bearing assembly includes a cylinder bearing having parallel planar support surfaces on opposite sides. An annular eccentric guide bearing has a cylindrical outer surface which is fitted into the cylindrical opening in the frame. The guide bearing is provided with opposed parallel way surfaces perpendicular to the plane containing the axes of the cylinders for slidably receiving and supporting the cylinder bearing. A first adjustment is provided for rockably positioning the guide bearing.

Abstract: To suppress shocks and bending oscillations arising upon roll-off of grooves (7, 8) of printing or blanket cylinders (3, 4) the blanket cylinders are constructed as hollow elements within which an absorber rod (12) is located, secured by a transversely extending member (11). The absorber rod which has propeller-like vanes, buckets or extensions (8) secured to its ends, the transversely extending member, and if provided, inertia masses secured to the end portions of the absorber rod are all embedded within a damping material filling the interior of the cylinder. The damping masses can be formed with the radial projections, vanes, buckets or propeller-like extensions (18), all embedded within the damping mass.

Abstract: To suppress shocks from being transferred to the walls of a cylinder (3) of a printing machine, when grooves (7) on the cylinder roll-off against another cylinder, and particularly against the edges of another groove (8) in an engaging cylinder, a damping mass (11) is filled within the cylinder which additionally retains an elastic shaft (12) on which an inertia mass (13) is secured. The inertia mass, preferably in form of a ball, is excentrally located on the elastic shaft (12) and touches at a point C the inner surface of the wall (10) of the cylinder (3) when the cylinder is in engagement with another one. The impact or shock, at the edge of the groove (7) rolls off against an engagement cylinder causes the inertia mass (13) to be accelerated towards the center of the cylinder, typically upwardly, and to place this mass into oscillations.

Abstract: This invention relates to a printing machine provided with a printing head comprising a plurality of coaxial rotating printing wheels, wherein the control wheel is fast in translation with a carriage mobile parallel to the axis of said printing wheels and bearing two stepper motors, of which the first allows said carriage to slide and the second drives said control wheel in rotation. The invention is particularly applicable to the printing of parts, cables, wires, etc. . . . when they are manufactured.

Abstract: A device for fixing by suction a printing plate comprises: a casing whose interior is partitioned into a large number of compartments having open front faces; a perforated punching plate fixed to the casing to cover the open front faces of all compartments; a valve device mounted on a valve port formed on the rear side of each compartment; and a negative pressure source connected by way of the valve ports to respective compartments and applying suction to all valve devices, whereby the printing plate placed on the punching plate is fixed by suction tightly thereagainst.

Abstract: The present invention discloses a serial printer for reciprocating a carrier along a platen by means of a wire, wherein the wire is connected to a wire retainer, which is a member separated from the carrier, to form a wire route, the carrier being detachably mounted on the wire retainer whereby the carrier may be removed with the wire remained stretched. Maintenance, checking and repair are easily accomplished and initial assembling is accomplished in a very simple manner.