Abstract: A printer is provided which has an openable front panel. This front panel is opened to load printing paper into a paper tray which is invisibly located behind the front panel. The paper tray is provided in a mechanical sub-chassis movably disposed within a mechanical main chassis of the printer. The sub-chassis is laterally slidable relative to the main chassis via a pair of guide rails and is rotatable to open the front panel via a pair of arm plate to expose the paper tray outside of the printer body. The arm plates are attached to a drive shaft supported by the main chassis so as to allow slight relative displacement therebetween to cancel assembly error. According to rotation of the drive shaft, the both arm plates swing synchronously.

Abstract: A doctor blade holder has two holder parts (4, 5) to clamp a doctor blade (3) with a straight edge therebetween. The holder parts define opposed holder surfaces (6, 7), which, at least in part, form surfaces of an elliptical cylinder which has a cross-sectional form in the shape of an ellipse (Z) which has a longitudinal axis (B--B) which intersects the longitudinal axis (A--A) of the cylinder by an angle of inclination (.alpha.) which, customarily, is in the order of between 0.1.degree. to 1.degree., but may be substantially larger. The minor half-axis of the ellipse (Z) is equal to the radius (r) of the printing machine cylinder (1) and the major half-axis of the ellipse (Z) is longer than the length (1) of the printing machine cylinder against which the doctor blade edge is engaged.

Abstract: A print wheel printer includes a trigger unit casing and a main housing frame, a plurality of print wheels rotatably mounted on a print wheel shaft and having a corresponding ratchet wheel secured to one side of each print wheel. A plurality of rotatably mounted selective pawls are supported on the trigger unit casing for stopping the rotation of the print wheels at selected print wheel engagement positions wherein a corresponding pawl is rotated into position to engage a corresponding print wheel ratchet wheel. A rotatable reset lever is also mounted on the trigger unit casing for the purpose of returning the selective pawls to a print wheel disengagement position. The selective pawls and the reset lever are both supported on the trigger unit casing in a prealigned relationship and support means are provided on the main housing frame for supporting the set of print wheels.

Abstract: A printing ink fountain having a disposable liner made of paperboard or the like for use with flexographic printing presses. The liner, which is supported in a liner retainer, is generally upwardly open to receive therein a metering roller of the printing press. The liner includes a flexible drain hose attached to the bottom thereof for draining ink from the liner.

Abstract: A method and apparatus for use with a grooved perfecting cylinder in a sheet-fed rotary printing press of the type capable of one sided or two sided sheet printing, the apparatus including a substantially rigid covering having a friction reducing coating thereon and which can be quickly and easily installed and removed over the sheet supporting surface of the perfecting cylinder when the press is operated in the one sided printing mode to permit an anti-marking fabric net to be installed and used over the sheet supporting surface of the perfecting cylinder.

Abstract: The present invention provides a paper holding device for a printer which includes a supply arm mounted for pivotal motion on a housing on which a printing station is held. The supply arm holds a supply shaft thereon such that at least the supply shaft may be positioned outwardly of the housing so that paper in the form of a roll having such a large diameter that it cannot otherwise be accommodated in the housing can be used on the printer.

Abstract: A ribbon cassette including a casing provided with an opening for receiving a photoelectric device. In the casing is a ribbon which passes from a supply reel to a take-up reel. A guide leads the ribbon past the photoelectric device. If the ribbon breaks, the ribbon is pulled away from the photoelectric device to cause a change in received light.

Abstract: The invention relates to a method and an apparatus for setting up a print specification defined by a binary value representing the solid color density and the dot gain on an autotypically operating polychrome printing machine. Binary values representing solid color density and dot gain measured by means of a densitometer are tested for their conformity with the print specification with the aid of correlations between solid color densities and dot gains from previous, similar printings, in order to determine at the earliest possible time during the setting up of the printing press for a new print order whether the print specification can be achieved by the mere manipulation of its color area adjusters. If conformity can not be achieved, the printing press is shut down.

Abstract: A passive lubrication system for use in a high speed print hammer mechanism to provide continuous lubrication to all print hammers over the lifetime of the mechanism. A plurality of hammer elements are pivotally engaged by a common pivot pin element. The lubrication system comprises a hammer block and a reservoir block both made of sintered material and each containing a supply of lubricant. The hammer block supplies lubrication to the pivot pin/hammer element bearing interfaces by capillary action. The reservoir block in turn supplies lubricant to the hammer block by capillary action to replenish the supply of lubricant as depleted in the hammer block. The reservoir block has a porous microstructure in which the porosity is at least equal to but preferably in coarser than the porosity of the porous microstructure of the hammer block.

Abstract: Print drums are described wherein a special "alignment character" is placed, along with print-symbols, on the surface of the print drum, mixed-in with at least one of the character sets.

Abstract: A spray dampening system is disclosed having a number of spray nozzles arranged in laterally spaced relationship, for spraying dampening fluid onto a dampening roll of a printing press in laterally adjacent individual spray patterns which merge on the dampening roll surface in a substantially continuous and laterally extending composite spray pattern. The system, through an arrangement of a plurality of guideway slots on a stationary member and cam slots on a pair of reciprocally movable cam members, moves the spray nozzles simultaneously laterally toward and away from each other and axially toward and away from the dampening roll surface, so that the width of the composite spray pattern may be adjusted while preventing excessive overlapping of the laterally adjacent individual spray patterns.

Abstract: An office machine, for example, a printer, with a printing unit, individual paper transport via driving rollers and endless paper transport via a tractor is to be designed in such a way that as many operating modes as possible can be obtained by simple means. This is achieved at least one releasable cassette for individual paper is in the entry region of a printing unit. A tractor is pivotalby adjustable into a pushing and a pulling position and is located behind the printing unit. The following operating modes are selectable by adjustment of the tractor positions coupled to further components:a. Straight individual paper transport from the front via driving rollers either by manual infeed or by automatic cassette infeed, the tractor being in the pushing position.b. Curved endless paper transport from the rear via the tractor set in the pushing position and via a portion of the driving rollers.c. Straight endless paper transport from the front via the tractor set in the pulling position.

Abstract: A stamp printing machine has print drum carrying print wheels which are settable by push buttons to print a selected value of postage charge. The drum is driven by a mechanical device such as tensator spring motor. The motor is manually primed and a trip lever operated by insertion of mail item releases the print drum to rotate through one revolution to print the stamp on the mail item. The stamp machine may include a calculator on which the postage value may be manually entered. Electrical contacts operated by the rotation of the drum are connected across the M+ button of the calculator to add the postage amount to its memory.

Abstract: An ink distributor roll is made of base rubber and two soft rubber helixes. When the ink distributor roll is used adjacent another roll, the soft rubber helixes deform to form pockets between the ink distributor roll and the other roll. The pockets move ink from the end portions of the ink distributor roll toward the center portion of the roll to prevent a buildup of ink at the end portions of the roll.

Abstract: A matrix pin print head of the hinged clapper armature construction includes several pin systems which, in each case, include a magnetic yoke limb pair (2), an electromagnetic coil (3), a hinged clapper armature (4), and a print pin (1). The multiple pin system further includes an electromagnetic coil support (13), which is produced by way of sintering or precision-casting, and which forms a single-piece component together with a base plate and the magnet yoke limb pairs (2). In a system with a low number of pins such as nine pins, the electromagnetic coil support (13) exhibits radially outwardly individual magnet yoke limbs (2a) and an armature guide, wherein the individual hinged clapper armatures (4) are precisely positioned and without cause for a loss of magnetic energy. In each case, the magnetic yoke limbs are directed toward a pin engagement point (8) or, respectively, to a pin attachment position (8b). The radial inner magnet yokes are formed to a closed, circular, or polygonal ring (17).

Abstract: A dot print head comprising a yoke, a plurality of cores formed integrally with the yoke in an annular arrangement in the peripheral portion of the yoke, solenoid coils wound respectively around the cores, armatures fixedly provided respectively with styluses, an armature support supporting each armature at the middle portion thereof opposite to the corresponding core for swing motion, and an armature holding member disposed opposite to the yoke with a predetermined gap therebetween to hold the armatures on the armature support for swing motion. A plurality of joining parts are formed on the yoke on a line on which the cores are arranged, and a plurality of joining parts are formed on the armature holding member so as to be joined respectively to the connecting parts of the yoke in joining together the yoke and the armature holding member.

Abstract: A guide mechanism for a slip paper path and for a receipt paper path. A spring plate is provided at the confluence of the paper paths to prevent the slip from entering the receipt paper path. The spring plate is engaged by the receipt to allow the receipt to be fed from the receipt paper path into the slip paper path.

Abstract: An improved automatic contact ink stamping apparatus which is characterized by a multipart ink re-charging assembly which facilitates the changing of the supply of ink or the ink pad in a quick and easy manner without disturbing the fixed registration position between the ink assembly and the stamp mounting plate. The contact stamping apparatus disclosed in the type wherein the die stamp is reciprocated between an ink re-charging and a stamping position. The ink re-charging assembly includes a mounting bracket fixed to a support base of the apparatus which is conformed to removably receive an ink pad holder. The ink pad holder includes an ink pad which is positioned therein to engage the work surface of the die stamp when it is located in the re-charging position. The ink pad holder can be easily removed in a simple manner and replaced for any reason without removing and adjusting the registered and sealed initial position of the bracket relative to the die stamp.

Abstract: A screen printing system and method is provided in accordance with the invention by using a circular base, a screen, an article to be printed and ink. The circular base has a planar top face. The circular base supports the article to be printed, such as an item of clothing made from cloth. The screen is held in a planar position by a rigid frame. The plane of the screen is positioned above and parallel to the plane of the top face of the circular base. The circular base has a side face with a groove therein which is adapted to hold a resilient flexible annular member. The resilient flexible annular member evenly holds the article to be printed to the circular base so that no wrinkles are allowed to remain in the article to be printed. If wrinkles were allowed to remain in the article to be printed then the pattern of the design to be printed would be distorted on the printed article. The screen includes a fine mesh cloth of fibrous material, such as, silk or nylon or similar filament.

Abstract: A passbook page turning mechanism includes independently movable and spaced upper rollers and independently movable and spaced lower rollers which are vertically movable and which grip the passbook and move the passbook from a printing station to a page turning station. A pair of upper and lower longitudinally movable rollers serve as apparatus to turn the pages of the passbook. At the page turning station, a lower roller of the pair of rollers is raised to flex the passbook and an upper roller of the pair of rollers is rotated to turn the page and to complete the page turning operation after which the passbook is moved to the printing station. The lower roller of the pair of rollers is also displaceable in the longitudinal direction from the upper roller of the pair of rollers. The mechanism also provides for turning one or more pages in the opposite direction from the direction of a normal page turning operation.