Abstract: A thermal head of a printer is provided to contact a platen through an elongated print paper and an elongated ink ribbon. One end of the ink ribbon is wound and retained on a ribbon core, and the other end is taken up by a take up spool. The print paper and the ink ribbon can be fed back at the same speed by reversely rotating the platen. At the same time, rotation resistance to be applied from the take-up spool to the ink ribbon is removed by a resistance removing device. Further, the ribbon core is reversely rotated by a ribbon core reverse driving device to rewind the ink ribbon, thereby preventing slacking of the ink ribbon.

Abstract: A power supply device includes a first output circuit for outputting a power supply voltage of a first potential, a second output circuit for outputting a power supply voltage of a second potential, a circuit for connecting the first and second output circuits, a circuit for applying a predetermined central potential to the connecting circuit, a circuit for generating a reference potential having a predetermined potential difference from the central potential, a circuit for generating a first detection potential corresponding to the first potential, a circuit for generating a second detection potential corresponding to both the first potential and the second potential, a circuit for controlling the first output circuit to minimize a potential difference between the first detection potential and the reference potential, a circuit for controlling the second output circuit to minimize a potential difference between the second detection potential and the central potential, and a circuit for forcibly changing at l

Abstract: A thermal printer includes a ribbon supply device for running a transfer ribbon through a printing section. The device includes a ribbon unit and a ribbon drive section which are removably mounted on a head supporting frame of the printing section. The ribbon unit includes a supply shaft on which the ribbon is wound, a take-up shaft for take-up the ribbon drawn from the supply shaft, a tension shaft, and a ribbon drive shaft. The supply and tension shafts are arranged to be symmetrical to the take-up and ribbon drive shafts, respectively, about an imaginary plane which extends between the supply shaft and the take-up shaft and between the tension shaft and the ribbon drive shaft, in parallel with these shafts, so that the unit is capable of being remounted on the head supporting frame while the unit is turned through 180 degrees.

Abstract: An edge emission type EL printer having a line head constituted by an array of numerous edge emission type EL devices. One group of electrodes for the EL devices receive driving pulses from a first driver means, and the other group thereof get driving pulses from a second driver means as per emission control signals. This allows the EL devices to selectively luminesce, forming an electrostatic latent image on the circumference surface of a photosensitive body charged by a charger. The image is developed by a developer and transferred to a recording medium by a transfer machine. The emission control signals entering the line head are monitored so that when the absence of EL devices luminescing within one primary scanning line is detected from the monitoring, a driving pulse stopping means is activated to stop accordingly the driving pulses continuously applied to the EL devices by the first driver means.

Abstract: A transfer printer includes a platen drive mechanism for rotating a platen roller facing a print head, and a paper feed mechanism for feeding a paper sheet passing between the platen roller and the head. A ribbon supply device is driven through a transmission mechanism by the drive power of the feed mechanism. The transmission mechanism has a roller holder supporting a transmission gear and arranged to be movable between a transmission position wherein the transmission gear engages an interlocking gear of the feed mechanism and an input gear of the ribbon supply device and a release position wherein the transmission gear is disengaged from the input gear so as to interrupt the power transmission. The roller holder is urged by a spring toward the transmission position, and restricted an excessive movement to the transmission position so that the transmission gear is in mesh with the input gear with a suitable backlash.

Abstract: A ticket issuing machine having a stocker for containing a continuous form, a paper carrier device for carrying the continuous form supplied from the stocker to an inlet of a carrier line, a paper separating device for separating the continuous form at a score thereof in the carrier line, and a printing/recording device for printing or recording data on the continuous form. The paper separating device includes a blade retained so as to be movable toward and away from a score formed in the continuous form, which blade has a rounded bursting portion adapted to face the score, and a blade driving mechanism for driving the blade so as to bring the blade into abutment against the score for separation of the continuous form at the score. Accordingly, the continuous form can be reliably separated at the score with a small force.

Abstract: A printing machine comprises a frame for supporting a pair of roller shafts spaced apart at a predetermined distance from each other and, a flat platen disposed between the roller shafts. An endless sheet-feeding belt made of an elastic material is stretched between the roller shafts. The sheet-feeding belt has an inner surface sliding on the flat platen by rotation of the roller shafts and an outer surface having such a high frictional coefficient that allows a sheet on the outer surface to be fed together with the sheet-feeding belt. A pair of pinch rollers hold the sheet in cooperation with the outer surface of the sheet-feeding belt at the roller shafts, for feeding the sheet. A printing head is opposed to the outer surface of the sheet-feeding belt at the flat platen.

Abstract: A line head device comprises a line head that has plural blocks of EL elements arranged in a row in the direction of a printing line for paper supplied to a transfer position and printed in line units. In the line head device, the line head has more than n blocks of EL elements, where n is the maximum number of EL elements required for the printing, and switches and a control circuit are provided to enable a group of n successive EL elements to be driven and change the group in accordance with paper alignment error in the processing line direction.

Abstract: When the label size is larger than the memory size of a frame buffer on which information to be printed on a label is drawn, the label is divided into a plurality of areas. A drawing enable area in the frame buffer is designated for drawing fields included in each divided area in units of divided areas, thereby performing label printing.

Abstract: The present invention provides a compact dot matrix print head comprising a housing internally provided with print wires, electromagnets for driving the print wires, a printed wiring board having a diameter smaller than the outside diameter of the rear end of the housing, fixedly joined to the rear end of the housing and provided with wiring patterns connected to the coils of the electromagnets, connectors connected to the outer surface of the printed wiring board so that the conductors thereof are connected electrically to the wiring patterns, and flexible cables each having one end connected to the connector and the other end connected to a driving unit for driving the electromagnets.

Abstract: An electric circuit apparatus comprises a long and narrow case having two openings at both longitudinal ends thereof, a long and narrow circuit board contained in the case, on which electrical parts are attached and in which an electric circuit connected to the parts is mounted, and a pair of terminal bases mounted at the two openings within the case and each including at least one external connecting terminal externally opened in the longitudinal direction of the case. The terminal bases support both longitudinal ends of the circuit board and have the external connecting terminal connected to the electric circuit of the circuit board. The electrical parts are positioned within the respective height ranges of the terminal bases.

Abstract: A printer includes a print head and a platen roller facing the head. The platen roller is supported by supporting frames. The frames are rotatably supported by a stationary shaft. A second set lever is mounted on the supporting frame to be movable integrally with the frames, and includes a pressing portion facing a paper guide. The paper guide is pressed against a feed roller for feeding a paper sheet passing between the head and the platen roller. When the supporting frames are rotated in a direction to leave the platen roller from the head by a first set lever, the pressing portion pushes the paper guide so as to leave it from the feed roller.

Abstract: In the image forming apparatus of the present invention, printing stations are provided in positions opposed to an endless paper conveying belt, and an electric charger is disposed close to a conveyance roller and on a downstream side of the conveyance roller with respect to a conveyance direction, which conveyance roller is disposed in a conveyance start position of the paper conveying belt, to maintain the surface potential of each recording paper in good condition, whereby it is made possible to prevent the deterioration of the image quality, diminish the power consumption and attain a reduction in size of the apparatus.

Abstract: The electrophotographic apparatus comprises a charging device disposed to confront a photosensitive member and a unit member fitted detachably inside the apparatus, with an ozone filter being mounted detachably in close proximity to the charging device inside the unit member. Ozone created by the charging device is dissolved promptly by the ozone filter by being led by a turning air stream produced by the rotation of the photosensitive member. The ozone filter can easily be replaced by taking the unit member out of the apparatus.

Abstract: According to the present invention an exothermic member is provided freely rotatably and formed in a ring form composed of an exothermic resistor layer of high resistivity formed on an inner peripheral surface and a conductor layer of low resistivity formed on the outer peripheral surface of the exothermic resistor layer. A medium-leading member is provided for forming a conveyance path for media with the outer peripheral surface of the exothermic member in between and a pressing electrode member is provided for supporting the exothermic member in abutting against the exothermic resistor layer in a conductive state in a position opposing to the medium-leading member.

Abstract: An electronic typewriter comprises a printing head, a carriage on which the printing head is movable along along a printing line, a keyboard including various keys, a carriage pointer for indicating the position at which the carriage is presently located, a line buffer having sequential memory locations corresponding to printing positions on the printing line, and a control circuit for performing a character key processing when a character key is operated and a space key processing when a space key is operated.

Abstract: An image recording method and apparatus including jetting a single carrier gas stream from a nozzle toward an oppositely disposed recording member, causing vaporous dyes formed by heating sublimable dyes to be blown out according to a picture signal into the carrier gas stream, and attaching the vaporous dyes carried on the carrier gas stream onto the recording member. The dyes enter the gas stream immediately adjacent the orifice of the nozzle. In a second embodiment, the plurality of nozzles, each carrying only one color, are vibratable to mix the colors.

Abstract: A demodulating apparatus comprises a frequency detector for performing a frequency-detection on a digital modulation signal to acquire a detection signal, a clock generator for generating a clock signal, and a discrimination circuit for sampling a voltage level of the detection signal from the frequency detector at a clock timing of the clock signal from the clock generator, and converting the sampled voltage level into digital data, which is set to have one of first and second logic values on the basis of a reference voltage LDC.

Abstract: In a developing method in which a thin layer of toner is formed on the surface of a toner carrier to which a developing bias voltage is applied and the thin layer of toner is supplied to an electrostatic latent image to thereby render the electrostatic latent image visible, the improvement wherein:when let it be supposed that:a quantity of electrification of toner that adheres to a latent image holding body by development is q [C/kg];a quantity of charges accumulated by the toner due to its triboelectrification with the latent image holding body is q.sub.p [C/kg];an electric resistance of the toner carrier is R [.OMEGA..multidot.m.sup.2 ];an effective length of the toner carrier is l [m];an effective surface area of the toner carrier is S.sub.r [m.sup.2 ];a quantity of the toner that adheres to the latent image holding body by development is m.sub.p [kg/m.sup.2 ];a speed of movement of the surface of the latent image holding body is V.sub.