Oki Electric Industry Co., Ltd.

Oki Data Corporation

Oki Electric Co., Ltd.

Naoji Akutsu

Jiro Tanuma

Chihiro Komori

Tadashi Kasai

Hideaki Ishimizu

Takao Uchida

Katsuyuki Ito

Akinori Kumonaka

Masayuki Ishikawa

Hiroshi Kikuchi

Akira Hagiwara

Mitsuru Kishimoto

Yukio Ota

Noboru Ooishi

Kazuhiko Itoh

Hiroshi Sakaino

Takehiko Okubo

Yasuhiro Shirai

Koichi Negishi

Yuhei Itasaka

Masaru Ito

A fixing unit fixes a developing material deposited on a recording medium by heating and pressing the recording medium. The fixing unit includes two heating members that apply heat to the recording medium and two temperature-sensitive shutoff devices. The two temperature-sensitive shutoff devices are connected in series with a corresponding one of the heating members. Each of the temperature-sensitive shut-off devices includes a first heat-sensitive shut-off element and a second heat-sensitive shut-off element. The first heat-sensitive shut-off element shuts off electric power to the corresponding one of the two heating members when a temperature of a surface of the corresponding one of the two heating members exceeds a certain value. The second heat-sensitive shut-off element shuts off electric power to the corresponding one of the two heating members when a temperature of a surface of the second one of the two heating members exceeds a certain value.

Fixing unit

A fixing unit fixes a developing material deposited on a recording medium by heating and pressing the recording medium. The fixing unit includes a first number of heating members that apply heat to the recording medium and a second number of switches that supply electric power to the first number of heating members. Each of the heating members receives electric power through a series circuit of the switches. Each of the switches responds to a surface temperature of a corresponding one of the heating members so that when the surface temperature exceeds a predetermined value, the electric power is shut off.

A needle disposal apparatus for melting a needle to be disposed of by passage of electrical current through it, has a guide member having an inlet which permits the needle to be inserted; an upper electrode roller, to which a first voltage is applied, the inserted needle making contact with an outer surface of the upper electrode roller; a lower electrode roller to which a second voltage is applied, the inserted needle making contact with an outer surface of the lower electrode roller; and a drive mechanism which rotates the electrode rollers in each direction so that the inserted needle is drawn between the electrode rollers; wherein the electrode rollers are disposed so that a part of the lower electrode roller is hidden behind the upper electrode roller when viewed from the inlet in a direction of insertion of the needle.

Apparatus for melting a needle using an electric current

According to a method of adjusting a head gap, a wire dot head is set to a predetermined position of a reference head gap; a printing pattern for detecting printing time is printed by a plurality of pins; reference printing times of respective pins are detected. Next, a test printing is performed with test printing dots previously selected from printing data, and printing time of the test printing is detected. Then, the thickness of the printing media is calculated based on the reference printing time and the printing time of the test printing. At that time, a rule of thumb in which the difference of the printing time corresponds to the difference of the head gap, is used. Then, a shift amount of the wire dot head is calculated for setting the head gap to an optimum value according to the thickness of the printing media, and gap shifting mechanism shifts the wire dot head by the shift amount. This leads to highly accurate detection of the head gap and improves printing quality thereof.

Method of adjusting a head gap for a wire dot impact printer

A power source circuit is provided having a high frequency transformer 16, a switching control circuit 15 connected with the primary winding of the transformer 16, rectifier circuits 17, 18 and 20 connected with the secondary winding of the transformer 16 for outputting a D.C. voltage to an external circuit, an alarm detection circuit 25, an excess current detection circuit 26, and an excess current detection delay circuit 28. When the alarm detection circuit 25 detects an excess current in supplying power source, the power source supply is suspended by turning off the output of the switching control circuit 15 after the lapse of the preset time. When the excess current flows after the lapse of the initial preset time t.sub.s from turning on the power source, the excess current detection circuit 26 detects it so that the output of the switching control circuit 15 is turned off.

Power source circuit incorporating a protection device therein and a

A printed chip-on-board substrate is for mounting a high-power semiconductor chip. As a construction for efficiently releasing or dissipating heat to be generated in the semiconductor chip, the printed substrate has a printed interconnected substrate and a metal plate bonded on a back side of the substrate. The printed interconnected substrate is constructed by forming an interconnected layer on a surface of the substrate. At a mount area where the semiconductor chip is to be mounted, an opening is formed reaching the metal plate. The metal plate covers the opening on the side of the back side and is formed with a thickness capable of providing rigidity sufficient to support thereon at least the semiconductor chip to be mounted.

Printed substrate for mounting high-power semiconductor chip thereon and

A drive system for a wire dot head is provided with sensors for detecting displacements of corresponding print wires. Each sensor outputs a movement initiation timing signal and an impact timing signal for the corresponding print wire. An electric current to be fed to an associated coil is normally controlled by these timing signals. It is detected whether these timing signals are obtained in a predetermined time period. If not, electric power is continuously fed to the coil or is forcedly cut off so that the timing signals are obtained within the predetermine time period.

Drive system for wire dot head

Printing control includes determining printing dot density of print data to be supplied to a printing head, averaging the printing dot density during a predetermined period of time based on the printing dot density determined, selecting a printing speed in response to the average value of printing dot density, and controlling printing to print at the selected printing speed.

Carriage speed control based on average dot density

A drive current for driving actuators is generated based on a first digital signal comprising n-bit binary data which is supplied from a microprocessor and it is applied to an excitation coil. The drive current is supplied to the exciting coil and is converted into a voltage which is then converted into a second digital signal comprising n-bit binary data. The binary data of the second digital signal is compared with the digital data of the first digital signal to detect an alarm condition. Furthermore, the second digital signal is compared with first and second reference value to set plural alarm conditions.

Alarm control method

In a wire-dot impact printer having a capacitance detector for detecting a displacement of each armature by a sensor electrode arranged opposite the armature, a space is formed between each sensor electrode and its associated armature, and a shield pattern is formed with a small space left around each sensor electrode. The shield pattern is fed with a potential at least equal to the potential of each sensor electrode. This makes it possible to reduce the influence of noise upon detection of a capacitance by the capacitance detector. A noise canceling electrode is also disposed around each sensor electrode and is connected to the sensor electrode, whereby a noise canceling circuit is further provided to eliminate noise voltage. The noise canceling circuit can eliminate a noise voltage picked up by the sensor electrode and the noise canceling electrode.

Wire-dot impact printer

Printer with an LED print head having means for setting data about the

In an electrophotographic recording device which includes a number of consumable parts, there is provided a first memory for storing a currently integrated total number of prints, and a number of prints at replacement of each consumable part. A second memory stores a number of lifetime prints, which is a conversion of the life of each part into a number of prints. A processor performs a first calculation to calculate a number of prints for replaced consumable parts after such replacement and a second calculation to calculate a wear rate of the replaced consumable parts from the number of lifetime prints read out from the second memory, and from the number of prints calculated by the first calculation. An indication section indicates the wear rate obtained from the second calculation. The number of prints stored in the first memory for the consumable parts at replacement is written into the current total number of prints.

Electrophotographic recording apparatus indicating a wear rate for

An electromechanical actuator includes an electric motor and a control and drive circuit mounted integrally with the electric motor. The control and drive circuit includes a serial-to-parallel converter for converting a control signal in the form of serial data into parallel data, and a device responsive to the control signal in the form of parallel data for producing a drive current or voltage for the electric motor. A system for accessing or controlling a plurality of such actuators by commands from a main controller can include a control and drive circuit which is integral with the motor itself.

Electromechanical actuator having control and drive circuit

An LED array print head for an electrophotographic printer includes: LED array device packages each being loaded with an array of LEDs individually connected to a first major surface of the LED package by first solder joints; LED driver packages each loaded with a driver circuit connected to a first major surface of the driver package by second solder joints; and an optically transparent insulative substrate with a first major surface carrying conductive leads adapted to electrically connect the LEDs and driver circuits. The LED and driver packages are mounted on the substrate in such an orientation that the first major surfaces of the packages face the first major surface of the substrate and the first and second solder joints are connected to the conductive leads of the substrate.

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Tokyo, Japan

Naoji Akutsu