摘要:
A recording sheet is positioned at one of a plurality of starting positions based on a printing mode used in previous printing operations. When printing operations are started in a printing mode different from the previous printing mode, the recording sheet is transported either in a forward direction or in a reverse direction to a corresponding starting position. Then, actual printing is started. On the other hand, when printing operations are started in the same printing mode, actual printing is started immediately. In this way, printing speed is improved.
摘要:
In a printing apparatus having a platen, a plurality of print hammers arranged in a horizontal row and a horizontally movable type carrier on which print carriers are arranged, a restraining member limits upward movement of a horizontally movable ink ribbon and thereby eliminates character omission. Between the print hammers and the type carriers are disposed the horizontally movable ink ribbon and a vertically movable print sheet on which a character impression is made upon impact of a selectively energized hammer. The print sheet is folded along transverse cut lines to define forms which are stacked together below the apparatus. When the print sheet is pulled upwardly, the folded portion tends to drag the ink ribbon upwardly displacing the ribbon from its print position. The restraining member is mounted above the ink ribbon to limit this upward movement of the ribbon.
摘要:
A dot line printer has a plurality of print hammers accommodated in a hammer bank, which make dot impressions on a sheet of print paper as the hammer bank reciprocally moves in a print line direction perpendicular to the direction in which the sheet of print paper is fed. To print L dot lines at a time with each of forward and backward movements of the hammer bank, the print hammers are divided into a preselected number of groups so that each group includes N number of print hammers where L and N are integers equal to or greater than 3. The print hammers in each group are displaced one dot line distance from one another in the sheet feeding direction. The print hammers in each group are further displaced in the print line direction by respective predetermined distances from their home positions so that the respective hammers in each group do not impinge upon the sheet of print paper simultaneously. The print hammers equal in number to the least common multiple of L and N or integer multiples of the least common multiple thereof are integrally formed into a module structure to facilitate the manufacture and management of the hammer assemblies.
摘要:
An auxiliary ribbon separator for use on a dot-line printer is positioned to prevent vertical ribbon displacement in the presence of upward forces such as caused by perforations on continuous feed paper. The auxiliary separator is located so that the ribbon is guided past an end of a front yoke. The front yoke serves as a course ribbon guide and is a component of the electro-magnetic assembly of the print head associated with the printer. The auxiliary separator may be shaped so as to facilitate loading of the ribbon in the printer.
摘要:
A sleeve member of elastomeric material is mounted on one of the driving and driven pulleys between which the type-carrier is passed. The sleeve member is wetted with a lubricant liquid so that a friction occurring between the type-carrier and the platen is minimized.
摘要:
A linear shuttle motor assembly used for reciprocally moving a printer head includes a rotor and a stator having the same mass. A loud, i.e., the printer head, is connected to the stator and a counter balance to the rotor. The rotor and the stator are driven to reciprocally move in mutually opposite directions. A 180 degree phase synchronizing mechanism is used to synchronize phases of the rotor and the stator. The mechanism is fixed to a housing and connected to the rotor and the stator. By this configuration, the amount of power transmission loss is reduced to a minimum, which improves energy conversion efficiency.
摘要:
A printing apparatus comprising a type carrier to travel along a print line on a printing paper, a plurality of printing hammers to be selectively driven to strike the printing paper against an inking ribbon and the inking ribbon against a platen in front of the inking ribbon, and a support member supporting the type carrier, inking ribbon and platen thereon, wherein the support member is movable between a position holding the type carrier, inking ribbon and platen in positions capable of performing printing operation but intercepting the line of sight between the print line and the operator's eyes and a position holding the type carrier, inking ribbon and platen in inoperative positions but providing an unobstructed line of sight from the operator's eyes toward the print line for enabling the operator to clearly view the printed information along the print line.
摘要:
A printer and ribbon cassette with gears for transmitting power from the drive motor of the printer to the ribbon cassette. Guides are provided for guiding the ribbon cassette in a direction perpendicular to the rotational axis of the gears, so that the ribbon cassette slides easily into place and the gears engage easily, but the gears are tightly engaged.
摘要:
A printing hammer assembly is provided having a plurality of hammer springs arrayed side by side at a predetermined pitch in a shuttling direction of a hammer bank. A front yoke is provided in front of the hammer springs, and a plurality of rectangular grooves are formed at an upper portion of the front yoke so as to receive therein corresponding rectangular plungers provided at the hammer springs. A gap is defined between a side wall of the groove and a side wall of the plunger. The gap is sufficiently large for tolerating inaccurate assembly of the hammer springs and the front yokes. Further, a subordinate front yoke is provided on the front yoke at a position of an array of the grooves.
摘要:
A paper tension adjusting device in which one of the tractors with feeding pins changing feeding apertures in the paper is movable widthwise to adjust widthwise paper tension. The desired tension is determined from paper thickness which is in turn determined from the hammer flight time. Lengthwise tension is adjusted by adjusting paper clampers separated from the tractors. The tension is both widthwise and lengthwise directions is determined by optically sensing the positions of the feeding pin with respect to the aperture in which that pin is engaged.