Abstract: A thermal printer is capable of maintaining the heating elements thereof at a constant temperature to achieve uniform print density and to avoid abnormal heating of the heating elements. For this purpose each heating element receives a stronger driving pulse at the first printing operation in a scan line and receives a weaker driving pulse at the subsequent printing operation.

Abstract: A thermal transfer printer includes a thermal head having plural heat generating elements, a thermal head driver connected to a character generator for controlling the thermal head by supplying drive currents to the heat generating elements of the thermal head in response to print information, and control circuit for controlling the drive currents from the thermal head driver in response to the ambient temperature. Therefore, the thermal transfer printer is capable of constantly providing an optimum transfer density regardless of the ambient temperature, thus ensuring a satisfactory print quality.

Abstract: An electronic apparatus comprises a left-hand unit and a right-hand unit mutually connected to constitute a foldable structure, in which a display device is provided in one of the units while an aperture is provided in the other to enable observation of the display device even in the folded state of the apparatus. Operational keys are provided on the other unit or on both units to enable operation of the apparatus in the open and/or folded position thereof.

Abstract: The apparatus of the present invention is provided with a stain preventing element provided between a print drum and a hammer and adapted to shield alternate digits to be printed, said stain preventing element being shiftable in the transverse or advancing direction of print sheet. Said hammer is an intermediate hammer which is set to a predetermined initial position from an unsteady position upon the turning on of the power supply, and simultaneously necessary preparations such as paper feeding and ink application onto the print drum prior to the printing are performed. Also there is provided a stain preventing mechanism for multi-color printing, and the above-mentioned stain preventing member is provided with a means for preventing ink diffusion. Also the paper feed plunger etc. is structured similar to the said hammer thereby rendering the entire apparatus smaller and more compact.

Abstract: An ink ribbon for a printing device comprises a substrate of a long thin web of a synthetic resin film having a solid ink coated on one surface thereof, the color of the substrate being the same as that of the solid ink. After the ink ribbon is used, the negative impressions left from the transfer of information to a printing sheet will be illegible.

Abstract: A heat transfer printer prints information while sequentially driving dots of a thermal head to urge them against a platen through a printing paper sheet and a transfer ink ribbon. The printer has a pulse motor or the like which carries the transfer ink ribbon at a speed relative to the stationary printing paper sheet for performing heat transfer printing with the thermal head.

Abstract: Improvement in the printing device of a type ring selection system, wherein each independent type ring for each numerical place is rotationally controlled to select a required type on the outer periphery of each type ring at a position opposite to a platen, whereby the types for these numerical places to be printed in one line are aligned and the single line is printed at once with the thus aligned types.

Abstract: A printing apparatus for serial printing by displacement of a printing head, in which a discriminating circuit identifies the typefont of the printing head mounted on the carriage, and a coincidence circuit compares the result of typefont identification with the typefont to be printed and provides alarm if the two are different.

Abstract: A printer is disclosed which comprises a recording head for recording information on a recording medium and control means for shifting the position of the recording head relative to the recording medium subsequently to the ending of a recording on the recording medium by the recording head at a record end position preset for the recording medium.

Abstract: A recording head having plural recording elements, a printed circuit board connected to the plural recording elements for power supply thereto, a serial-in-parallel-out driver circuit provided on the printed circuit board for converting the signals to the recording elements into parallel signals, and electrodes provided on the printed circuit board for connection with an external connector.

Abstract: A printing apparatus of the type in which character wheels of respective columns are independently rotatably juxtaposed and the character wheel of each column is individually rotation-controlled to select a desired one of characters on the outer periphery of the character wheel at a print position, characterized in that the apparatus is compact and light in weight.

Abstract: A printing apparatus has a motor, a character drum rotated by the rotational force of the motor, a printing paper feed mechanism operable by the rotational force of the motor, and a mechanism for shifting hammers and a stain preventing member integral with said mechanism and shiftable by the rotational force of the motor. The stain preventing member has shielded portions at every other column.

Abstract: In the printer, each printing hammer is composed of a pair of electroconductive elastic members arranged parallel to the axis of a type drum and is provided with paramagnetic material at its head. The hammer, when not used, is kept pulled in the non-printing position with the paramagnetic material attracted by a permanent magnet to accumulate mechanical energy in the elastic members. When the accumulated energy is discharged by an electromagnet provided at each hammer head including the paramagnetic material, printing operation is executed. Finishing the printing operation, the hammers return quickly to their home positions by the permanent magnet attraction force. A type drum and hammer heads are composed of an organic resilient substance.