Abstract: A control apparatus includes a controller that controls, by vector control, voltages and currents to be supplied to plural phases of a brushless motor. The vector control is performed through rotation control using a q-axis current predominantly to control rotation of a rotor, and field fixing control using a d-axis current predominantly in response to reception of a stop command signal. The controller controls the brushless motor with reduced influence of a dead time, in which a high-side switching element and a low-side switching element of each of plural half-bridge circuits are simultaneously set to OFF. The plural half-bridge circuits are provided in association with the plural phases of the brushless motor and are configured to supply the voltages and the currents to the respective phases. The influence of the dead time is reduced through the field fixing control.

Abstract: A control apparatus includes a controller that controls, by vector control, voltages and currents to be supplied to plural phases of a brushless motor. The vector control is performed through rotation control using a q-axis current predominantly to control rotation of a rotor, and field fixing control using a d-axis current predominantly in response to reception of a stop command signal. The controller controls the brushless motor with reduced influence of a dead time, in which a high-side switching element and a low-side switching element of each of plural half-bridge circuits are simultaneously set to OFF. The plural half-bridge circuits are provided in association with the plural phases of the brushless motor and are configured to supply the voltages and the currents to the respective phases. The influence of the dead time is reduced through the field fixing control.

Abstract: Provided is an image forming apparatus including a positioning portion provided upstream of a transfer portion in a transport direction of a recording medium. The positioning portion positions the medium using a leading end of the medium. Additionally included is a detector that is disposed downstream of the positioning portion in the transport direction, and that detects passage of the leading end of the medium; and a controller that controls a transport speed in a period from when the leading end of the medium passes through the detector to when the leading end of the medium passes through a target position situated downstream of the detector in the transport direction, in accordance with a time since transport of the medium is started from the positioning portion until the leading end of the medium passes through the detector.

Abstract: Provided is an image forming apparatus including a positioning portion provided upstream of a transfer portion in a transport direction of a recording medium. The positioning portion positions the medium using a leading end of the medium. Additionally included is a detector that is disposed downstream of the positioning portion in the transport direction, and that detects passage of the leading end of the medium; and a controller that controls a transport speed in a period from when the leading end of the medium passes through the detector to when the leading end of the medium passes through a target position situated downstream of the detector in the transport direction, in accordance with a time since transport of the medium is started from the positioning portion until the leading end of the medium passes through the detector.

Abstract: A control device includes an obtaining unit that obtains rotation information indicating an amount of rotation and a rotation direction of a rotor of a brushless motor; and a controller that specifies a current to be provided to a coil of the brushless motor to control a rotating magnetic field generated by the coil by performing change control for gradually changing an electrical angle of the rotating magnetic field, detecting, as an initial position of the rotor, a position in which the rotor faces magnetic poles generated at an electrical angle when the rotation direction obtained during the change control changes from a first direction to a second direction and a difference between the amount of rotation in the first direction and that in the second direction obtained during the change control becomes smaller than a first threshold, and controlling the rotating magnetic field in accordance with the initial position.

Abstract: A control device includes an obtaining unit that obtains rotation information indicating an amount of rotation and a rotation direction of a rotor of a brushless motor; and a controller that specifies a current to be provided to a coil of the brushless motor to control a rotating magnetic field generated by the coil by performing change control for gradually changing an electrical angle of the rotating magnetic field, detecting, as an initial position of the rotor, a position in which the rotor faces magnetic poles generated at an electrical angle when the rotation direction obtained during the change control changes from a first direction to a second direction and a difference between the amount of rotation in the first direction and that in the second direction obtained during the change control becomes smaller than a first threshold, and controlling the rotating magnetic field in accordance with the initial position.

Abstract: An image processing apparatus includes first and second transfer circuits. The first transfer circuit transfers a first image processing signal in accordance with a first reference signal. The second transfer circuit transfers a second image processing signal, which is extracted from the first image processing signal in accordance with a second reference signal. The first transfer circuit includes a transmission circuit that transmits an adjusting signal to the second transfer circuit in accordance with the first reference signal. The second transfer circuit includes first and second adjusting circuits. The first adjusting circuit adjusts a phase of the adjusting signal so that the second image processing signal will be stably extracted from the adjusting signal in accordance with the second reference signal. The second adjusting circuit adjusts the phase of the adjusting signal so that the second image processing signal extracted from the adjusting signal will match the adjusting signal.

Abstract: An image forming apparatus includes: a monitor that monitors a state of communication performed in the image forming apparatus; and a controller that, when the monitor monitors that the state of the communication is abnormal, controls the communication based on an operation of the image forming apparatus in which a state has been changed within previously determined time including a time point at which the state of the communication has become abnormal.

Abstract: An image processing apparatus includes first and second transfer circuits. The first transfer circuit transfers a first image processing signal in accordance with a first reference signal. The second transfer circuit transfers a second image processing signal, which is extracted from the first image processing signal in accordance with a second reference signal. The first transfer circuit includes a transmission circuit that transmits an adjusting signal to the second transfer circuit in accordance with the first reference signal. The second transfer circuit includes first and second adjusting circuits. The first adjusting circuit adjusts a phase of the adjusting signal so that the second image processing signal will be stably extracted from the adjusting signal in accordance with the second reference signal. The second adjusting circuit adjusts the phase of the adjusting signal so that the second image processing signal extracted from the adjusting signal will match the adjusting signal.

Abstract: An image forming apparatus includes: a monitor that monitors a state of communication performed in the image forming apparatus; and a controller that, when the monitor monitors that the state of the communication is abnormal, controls the communication based on an operation of the image forming apparatus in which a state has been changed within previously determined time including a time point at which the state of the communication has become abnormal.

Abstract: A printer control apparatus performs printing control while converting print density within a page, to convert print density at low cost without changing the print resource. The apparatus includes a detecting unit for detecting a bar code pattern for which density should be converted from the bit map data, and the expanding unit for changing the number of data expansion dots according to the detection result. Since the print density of a specified pattern in a page can be changed from the print density of the other area, the present invention can be implemented without changing the print assets and command system at the host side, and without changing bit map expansion processing and bit map expansion density of the printer controller.

Abstract: According to the present invention, there is provided a continuous medium printing apparatus including a printing section, a determining section, instructing unit, wherein the determining section is controlled in its reading operation for acquiring printed image data from continuous paper in accordance with first instructing signal supplied from the instructing unit, and the printing section is controlled in its printing operation on the continuous paper in accordance with a second instructing signal supplied from the instructing unit.

Abstract: A printing apparatus for printing on double-sides of a recording medium has a first print control unit for controlling an one-line exposure for the right or reverse side by a horizontal synchronous signal, and a second print control unit for controlling the one-line exposure for the reverse or right side by using this horizontal synchronous signal. A print start timing for the right side can be synchronized with a timing for the reverse side, and is capable of preventing a deviation in print position between the right side and the reverse side of the recording medium even by providing the print control units for the right side and the reverse side, individually.

Abstract: The present invention provides an exposure device capable of operating at a high speed and obtaining an excellent printing result. The exposure device according to the present invention includes optical write heads using shift registers of two systems, and a circuit that supplies image data for one line divided into the first half and the second half to the respective shift registers. The circuit is consist of a write control section, a memory, a read control section and a transfer control section), and receives data of twice the number of bits of data inputted to the shift register.

Abstract: An optical write head operable in high speeds is provided with better printing results. The optical write head is arranged by an LED array constructed of a plurality of LEDs arrayed in a line form, one shift register used to store thereinto pixel data for a front half portion of this LED array, and the other shift register used to store thereinto pixel data for a rear half portion of this LED array. The optical write head is further arranged by registers for latching parallel pixel data outputted from these shift registers, and a driving circuit for simultaneously driving the LEDs employed in the LED array in response to patterns of the pixel data outputted from the registers when a control signal is inputted.

Abstract: Conveyance apparatus for a continuous form having sprocket holes on both sides thereof provided in a high-speed printing system, comprised of a printing machine and an after-treatment machine, including: a constant-speed conveyance roller for feeding the continuous form to the printer; a pair of ejection rollers located downstream of the constant-speed conveyance roller for conveying and ejecting the continuous form, under tension, by rotating a little faster than the constant-speed conveyance roller; a pair of drawing rollers provided at the entrance to the after-treatment machine for pulling the continuous form therein injected by the printing machine; an end sensor for outputting an end signal when a disengagement between the last sprocket hole and the constant-speed conveyance roller is detected; and a controller.