Abstract: In an optical printing system for printing an image on a recording sheet, adopted as the recording sheet is a sheet coated with microcapsules on one surface thereof. Each microcapsule envelopes a first component which changes color when reacts with a second component. The second component may be coated on the recording sheet or may be coated on a separate developing sheet. The microcapsule further envelopes a third component which varies the mechanical strength of microcapsule when light is projected thereto. An image is formed on the recording sheet by selectively exposing a light thereto in accordance with the image to be printed thereon, and the microcapsules on the recording sheet whose mechanical strength is low are then ruptured by rupturing means. Thereby, the color is developed or the recording sheet on the separate developing sheet by the reaction of the first component with the second component.

Abstract: A thermo-magnetic recording device wherein a magnetized latent image is produced on a magnetic layer by locally heating the magnetic layer. The device includes a heat-generating ribbon for generating heat upon energization thereof, at least one working electrode movable relative to the magnetic layer in a recording direction, and relative to the heat-generating ribbon in sliding contact with the heat-generating ribbon, such that the at least one working electrode locally holds the heat-generating ribbon in contact with the magnetic layer, a deive for effecting a relative movement between the ribbon and the at least one working electrode, and at least one auxiliary electrode placed in direct or indirect contact with the heat-generating ribbon.

Abstract: A composite printing apparatus includes a character-based impact printer, a dot matrix printer, and a memory for storing a plurality of sets of pattern data corresponding to different fonts and other characteristics of print images. The impact printer includes a print element carrier having indicia identifying the font and other characteristics of the print elements on the carrier. A print carrier detector determines from the indicia the type of type elements on the carrier and generates signals for selecting from the memory a set of corresponding pattern data that is used to control the dot matrix printer to produce character images with print quality and characteristics matching those of the character images produced by the impact printer.

Abstract: A printing apparatus for printing on a sheet of paper via a thermal ribbon comprising: a paper feeding device for feeding the sheet of paper; a thermal print head including heat generating elements which are held in pressed contact with the surface of the sheet of paper via the thermal ribbon, the heat generating elements being selectively energized to apply heat to an ink layer of the thermal ribbon to fuse the ink for adherence of the fused ink to the surface of the paper; a detecting device for sensing the smoothness of the surface of the sheet of paper fed by the paper feeding device; a print-quality improving device for improving the quality of printing on the sheet of paper; and a control device for activating the print-quality improving device while the sensed smoothness is lower than a preset lower limit, the control device deactivating the print-quality improving device while the sensed smoothness is not lower than the preset lower limit.

Abstract: A paper feeding apparatus for a printer, comprising feed rollers to feed sheets of paper in a direction across a line of printing, a paper stacker holding the sheets in a stack and movable between an advanced and a retracted position, a biasing device for biasing the paper stacker toward its advanced position to urge a top sheet of the paper stack into contact with the feed rollers, a manually operated member movable between a first and a second position, a retract-and-latch device for moving the paper stacker to the retracted position against a biasing force of the biasing device and locking the paper stacker at the retracted position when the manually operated member is moved from the first to the second position, and an unlatch device for releasing the retract-and-latch device to allow the paper stacker to return to the advanced position when the manually operated member is moved toward its first position.

Abstract: A paper feeding device for a printer having a first paper handling assembly including rollers for feeding sheets of paper of one kind from a first paper stacker along a first inlet path to a printing assembly of the printer, and a second paper handling assembly including a second stacker for receiving the printed sheets from the first stacker, and supported by a support member pivotally between first and second positions. The support member carries at least one paper guide which is pivotable between its first and second positions according to pivotal movements of the support member. In the first position, the paper guide defines a paper exit path opening through which the printed sheets are guided into the second stacker. When the paper guide is pivoted to its second position, it closes the paper exit path opening. The feeding device further comprises a member or members defining a second inlet path adjacent the second paper handling assembly when the support member is in the second position.

Abstract: A paper loading apparatus for a printer wherein sheets of paper are moved by a paper feeding device to a printing device to effect printing on the paper. The apparatus comprises a paper stacker for storing a stack of the sheets of paper, a feed roller engageable with the top of the paper stack and rotatable for feeding along a first paper path the individual sheets in one direction from the paper stacker toward the paper feeding device, a controller for controlling the paper feeding device such that the sheets of paper fed from the paper stacker are first moved in the above one direction into the printing device and subsequently moved in a reverse direction opposite to the above one direction, and a guiding device for guiding the sheet of paper moving in the reverse direction along a second paper path in which the sheet of paper is free from engagement with the feed roller.

Abstract: A printing apparatus having a first printing unit provided with a plurality of type elements and adapted to print characters and symbols and a second printing unit capable of plotting optionally, graphs and figures, and capable of attaining both high quality printing of characters and symbols and high-quality plotting of graphs and figures, and with good speed.

Abstract: A key matrix circuit comprises a plurality of column lines and a plurality of row lines, a plurality of capacitance switches which are respectively arranged at different intersections of the column lines and row lines, and a select switch having a condenser, a movable contact connected to a selected one of the column lines and a plurality of change-over fixed contacts, respectively, connected to different row lines other than the row lines to which the selected column line is connected through the capacitance switches. Each of the fixed contacts is selectively connected to the movable contact and the selected column line is connected to one of the different row lines through the condenser which has an equivalent capacitance to the capacitance switches when operated. A decoder and a multiplexer are respectively connected to the row lines and the column lines of the key matrix circuit.

Abstract: The casting apparatus for a hollow steel ingot is constructed such that: at least three concentric pipes are provided in the central portion of an ordinary mold for a steel ingot; a core is formed by filling up a space formed between the first outer-most pipe having the largest diameter and the second pipe disposed inwardly of the first pipe with granular refractory material wherein zircon or chromite sand is bound by a binder such as an organic resin; a double pipe is disposed inwardly of said core and forming a gas flow course for cooling the core; and pouring gates formed through the stool for feeding molten steel at an intermediate portion between the inner wall of said mold and the core.

Abstract: This invention relates to an apparatus for conveying cops and bobbins for directly connecting a ring frame with a winder wherein one operation to feed those cops which are doffed onto the transport-bands on both the right and left sides of the ring frame to the subsequent process from one end of each of the transport-bands and the other operation to receive bobbins needed for the next doffing onto the transport-band are together simultaneously performed, with these two simultaneous operations being repeated. This invention has no provision of a random stock zone and the substantial function of bobbin stock is given to the transport-band, and the bobbin returned from the winder is adjusted in alignment thereof by the bobbin aligning device and conveyed by the bobbin stock conveyor and dropped onto the transport-band.