Tokyo Electric Co.

Kabushiki Kaisha Tec

Tsuyoshi Matsushita

Makoto Takahashi

Narumi Kikuchi

Yutaka Wada

Masafumi Sato

Kazuaki Takaishi

Hiromoto Ishii

Eiichi Furuya

Motoi Maekawa

Yoshiaki Ito

Katsuya Endo

A printing mode setting portion outputs energizing time data corresponding to a selected printing mode when selecting the printing mode according to operation of the operation unit. Based on the energizing time data, the energizing time period of a head energizing signal which is output from a head driving portion to a driving coil of a dot printer head is controlled by the energizing time control portion 6. When printing mode having a high dot density is selected, printing energy is reduced and the energizing time period is refined for the driving coil 8, thus making it made possible to lower the noise level.

Output controller for a dot printer head

Disclosed is a method for driving a printer carrier. One power source is connected via a constant current circuit to the carrier motor. Data storing means stores the current command data corresponding to the acceleration, constant speed printing and deceleration of the carrier motor. According to the method, the current command data from the data storing means is latched in synchronism with a clock signal. The latched data is converted to a current reference voltage. The output current of the constant current drive circuit is varied in accordance with the current reference voltage. Changing the current command data as desired makes it possible to adjust freely the torque of the carrier motor for acceleration and deceleration on a constant voltage from one power source.

Printer carrier driving method

A reader comprises a feeding path for boarding pass to be inserted in various orientations, pairs of feeding rollers for transporting the boarding pass along the path, and four sensor units arranged along the path each for sensing a signal recorded on the boarding pass inserted in a particular orientation. The reader also comprises a demodulation unit for demodulating each signal sensed by the sensor units, a monitoring circuit for determining which one of the sensor units of has sensed the recorded signal, a switch circuit, for electrically connecting the demodulation unit to the sensor unit which the monitor circuit determines has sensed the recorded signal, and a read circuit for reading flight information by extracting a series of digital data from each demodulated signal output by the demodulation unit and converting the series of digital data into the parallel form in accordance with the particular orientation of the boarding pass facing the sensor unit which the monitor circuit determines has sensed the recorded signal.

Apparatus for reading a magnetic stripe on a boarding pass regardless of

A memory capacity detecting device for memory cards including at least one memory chip of a predetermined memory capacity comprises an address specifying section for generating an address signal which selectively specifies two memory chips, a data write-in section for writing two items of preset data into top memory locations of the specified memory chips, and chip number detecting section for detecting the number of memory chips in the memory card by first reading out the data from the top memory location of each specified memory chip, comparing the readout data with the corresponding preset data, and determining the number of memory chips based on the comparision results. Particularly, the data write-in section includes writing section for writing different two items of the preset data into the top memory locations, and the chip number detecting section includes reading section for reading out the data from the top memory location of each specified memory chip after all the preset data items have been written.

Memory capacity detecting device for memory cards

Grounding terminals of a memory unit are disposed at the opposite ends of an array of signal terminals of the memory unit, respectively, reception grounding terminals of a connector are disposed at the opposite ends of any array of reception signal terminals of the connector, respectively, the grounding terminals of the memory unit are connected to the reception grounding terminals of the connector, respectively, before the signal terminals of the memory unit are connected to the reception signal terminals of the connector in inserting the memory unit in the connector. Upon the insertion of the memory unit in the connector, the static electricity accumulate in the memory unit is discharged surely to a ground without affecting the semiconductor memory of the memory unit through the signal terminals and the reception signal terminals.

Connecting structure for connecting a memory unit to a memory unit

A memory device includes a reset signal generator for generating a reset signal when the output voltage from a main power supply circuit to supply a driving voltage to a memory decreases to a first predetermined voltage, and a switching circuit for allowing a data holding voltage from a backup power supply to be supplied to the memory in place of the driving voltage from the main power supply circuit in response to the reset signal. This memory device further includes a comparator for generating an inhibiting signal when it detects that the data holding voltage from the backup power supply following generation of the reset signal is lower than the voltage necessary to hold the data in the memory, and a control circuit for setting the memory into an operation inhibition state when it detects that the inhibiting signal was generated from the comparator following the reset signal.

Memory device having backup power supply

A dot character display apparatus includes a control circuit for transferring data corresponding to character body and upper and lower symbols from first to third character generators to image buffers, a drive circuit for driving a dot matrix display section on the basis of the data stored in the image buffers. The dot matrix display section has an upper display area to display the upper symbol, a central display area to display the charcter body, and a lower display area to display the lower symbol. The drive circuit has a first drive section to drive the central display area of the dot matrix display section in accordance with data indicative of the character body from the first character generator, and a secod drive section to drive the upper and lower display areas of the dot matrix display section in accordance with data representative of the upper and lower symbols from the second and third character generators.

Dot character display apparatus

A printing device comprises a carriage having a printing wheel, a printing ribbon driver and printing hammer fixed thereto, carriage driver for driving the carriage along a platen, wheel driver for setting the printing wheel to a position corresponding to an input character code, and hammer for driving the printing hammer. The printing device further comprises a memory for storing energy data corresponding to a character code representing a type formed at the top end portion of a corresponding spoke of the printing wheel as well as time data, and a control circuit for reading the energy data corresponding to the input character code as well as the time data and for supplying the energy data from the memory to the hammer driver when the printing wheel is set to a printing position designated by the input character code and preventing an operation of the wheel driver over a time period corresponding to the time data from the memory after the printing hammer has been driven by a printing energy corresponding to the energy data.

Impact printer with variable delay for print cycle based on different

An electronic typewriter includes a plurality of character keys, a specification selector, a printer circuit, and a memory for storing a plurality of specification tables, each having a plurality of key data. A data processing circuit detects a determined one of the plurality of specification tables in response to a selection signal from the specification selector, and reads out the corresponding key data from the specification table selected in accordance with the operation of the character keys, thereby driving the printer circuit in accordance with the key data. The specification selector includes a plurality of selection switches formed on the same keyboard together with the plurality of character keys.

Electronic typewriter with presettable specification tables

There is provided a printing apparatus which drives a printing wheel in response to a rotation angle data corresponding to an input character code and drives a printing hammer with an impact force corresponding to this input character code. A data processing circuit reads out the rotation angle data from a first memory, supplies a drive data corresponding to this rotation angle data to wheel driving circuit through a first data bus, and reads out the impact force data from a second memory and supplies it to a hammer driving circuit through a second data bus. The information relating to a character is accessed from the first and second memories via the same address.

Rotary wheel printing apparatus with controllable hammer striking force

A motor drive circuit includes ROM in which a plurality of driving speed patterns are stored, a RAM for storing step data indicative of the number of driving rotational steps, and a data processing circuit for supplying motor driving data to a motor control unit in accordance with one of the driving speed patterns selected on the basis of the step data in the RAM. A series of step timing data is included in each of the driving speed patterns. The data processing circuit sequentially reads out the series of step timing data related to the selected driving speed pattern from the ROM and supplies the motor driving data to the motor control unit each time the period of time corresponding to this read-out step timing data elapses.

Method of driving a stepping motor and a drive circuit thereof

A stepping motor driving circuit includes a plurality of switching transistors having their emitter-collector paths connected to the corresponding ends of motor coils, a plurality of diodes having their anodes connected to the above-mentioned ends of the motor coils and their cathodes connected to a common terminal, and a braking circuit connected between the cathode of the diodes and the other end of the motor coils, in which the switching transistors are sequentially turned ON to permit excitation currents to pass through the corresponding motor coils. The braking circuit has a variable effective impedance.

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Shizuoka, Japan

Tsuyoshi Matsushita