摘要:
A printer buffer unit is connectable to one or a plurality of host computers and one or a plurality of printers. The printer buffer unit has a unit for detecting a break of print job data sent from a host computer, and a unit for adding a job offset command at the time of the break in sending the print job data to a printer.
摘要:
An apparatus for generating a laser beam modulated on the basis of an information signal, which comprises a circuit for generating a first information signal, a circuit for generating a second information signal, independent of the first information signal, a circuit for driving a semiconductor laser on the basis of the first and the second information signals, wherein the driving circuit comprises first and second switching elements which operate supplementarily with each other, one of the first and second switching elements switches a drive current to the semiconductor laser, and wherein the first information signal is provided into a control terminal of the first switching element and the second information signal is provided into a control terminal of the second switching element.
摘要:
A printer buffer unit is connectable to one or a plurality of host computers and one or a plurality of printers. The printer buffer unit has a unit for detecting a break of print job data sent from a host computer, and a unit for adding a job offset command at the time of the break in sending the print job data to a printer.
摘要:
In a power supply circuit for a motor in which a power source line can be opened and closed by a first opening-closing device, a construction is adopted which has a electrically controllable second opening-closing device connected in parallel to the first opening-closing device, a comparator for comparing the voltage of the motor load side with a predetermined value, a controller for controlling the opening and closing of the second opening-closing device on the basis of a signal from the comparator, and a current limiter device provided in parallel to the second opening-closing device, whereby a rush current when the first opening-closing device is closed can be suppressed to thereby prevent the fluctuation of the source voltage and the deterioration of the contacts of the first opening-closing device.
摘要:
An apparatus for generating a laser beam modulated on the basis of an information signal, which comprises a circuit for generating a first information signal, a circuit for generating a second information signal, independent of the first information signal, a circuit for driving a semiconductor laser on the basis of the first and the second information signals, wherein the driving circuit comprises first and second switching elements which operate supplementarily with each other, one of the first and second switching elements switches a drive current to the semiconductor laser, and wherein the first information signal is provided into a control terminal of the first switching element and the second information signal is provided into a control terminal of the second switching element.
摘要:
A temperature control device for controlling a surface temperature of a member to be heated at a predetermined temperature includes a detector for detecting the surface temperature, and a control unit for controlling current supply for a heating source for heating the member to be heated so that a result of detection by the detector is maintained at a predetermined value. The control unit controls a time of current supply for the heating source during a constant temperature control according to data relating to peak temperatures of the surface temperature during the constant temperature control.
摘要:
An image forming apparatus is provided which is capable of positively preventing a recording sheet from being wound around a conveying means that conveys the recording sheet. A high voltage power supply section applies voltage to feeding brushes disposed in contact with the surface of a pressurizing roller having an electrically conductive surface. A winding sensor is disposed in contact with the surface of the pressurizing roller and is located in a sheet passing area of the pressurizing roller. A CPU sets a threshold voltage to a value corresponding to the temperature of the pressurizing roller detected by a temperature sensor, and detects whether the recording sheet is wound around the pressurizing roller, based upon the set threshold voltage and voltage of the pressurizing roller in the sheet passing area detected by the winding sensor.
摘要:
An image forming apparatus includes a process cartridge detachably mountable with respect to the main body of the apparatus. The process cartridge is provided with an image bearing member, a charger for charging the image bearing member, a power supply for applying an alternating current voltage to the charger, and a controller for variably controlling the alternating current supplied from the power supply to the charger in conformity with information about the use situation of the process cartridge. The process cartridge can also include an image bearing member, a charger for charging the image bearing member, the charger permitting an alternating current voltage to be applied thereto by a power supply, and a memory for storing therein information about the use situation of the process cartridge, and information of a plurality of preset control values for an alternating current supplied from the power supply to the charger to be variably controlled in conformity with the information.
摘要:
An image forming apparatus including an AC high voltage power supply, a DC high voltage power supply, and a high voltage power supply apparatus, which outputs an output voltage at an output end by superposing an output of the AC high voltage power supply and an output of the DC high voltage power supply. The high voltage power supply apparatus has a positive peak detector detecting a positive peak of the voltage at an output end, and a negative peak detector detecting a negative peak of the voltage at an output end. An output voltage of at least one of the AC high voltage power supply and the DC high voltage power supply is controlled on the basis of the detection result of at least one of the positive peak detector and the negative peak detector. An output voltage of the AC high voltage power supply is controlled on the basis of the detection result of the positive peak detector, and an output voltage of the DC high voltage power supply is controlled on the basis of the detection result of the negative peak detector.
摘要:
The image forming apparatus with the high voltage power supply apparatus which includes an AC high voltage power supply and a DC high voltage power supply and which outputs at an output end a voltage of an output voltage of the AC high voltage power supply superposed on an output voltage of the DC high voltage power supply, the high voltage power supply apparatus comprises a positive peak detection circuit and a negative peak detection circuit, and is arranged to control the output voltage of the AC high voltage power supply and the DC high voltage power supply, on the basis of the detection result of the positive peak detection circuit and the negative peak detection circuit.