| Patent application number | Description | Published |
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| 20080204491 | MOTOR DRIVING DEVICE - A motor driving device, which drives a DC motor, includes a motor driving unit, a status determination unit, and an initial value renewal unit. The motor driving unit repeatedly performs a change-over, wherein the motor driving unit changes an amount of a current inputted into the DC motor to an initial value at a predetermined timing, and then gradually increases the amount of the current from the initial value, in order to slowly move a driving target, driven by rotational force of the DC motor, in a moving direction. The status determination unit determines whether or not the driving target is in a predetermined status. The initial value renewal unit changes the initial value when the status determination unit determines that the driving target is in the predetermined status. | 08-28-2008 |
| 20080211846 | SETTING METHOD AND IMAGE FORMING APPARATUS - A method is provided for setting a target moving velocity of a carriage in an image forming apparatus wherein a recording head is driven at a driving frequency proportional to a moving velocity of the carriage. The method includes steps of: varying the driving frequency of the recording head proportional to the moving velocity of the carriage so as to measure an ejection velocity of ink droplets ejected from nozzles of the recording head; deriving a velocity range where the ejection velocity of ink droplets from the nozzles of the recording head is increased as the moving velocity of the carriage is increased; calculating a control error between the target moving velocity and an actual moving velocity of the carriage; and setting the target moving velocity of the carriage such that the actual moving velocity of the carriage is within the velocity range based on the calculated control error. | 09-04-2008 |
| 20080298827 | IMAGE FORMING APPARATUS - An image forming apparatus comprises: an image forming mechanism including a motor, and an image forming unit which operates by the motor to form an image on a recording sheet; a registration unit which registers a job; a control unit which controls the image forming mechanism to form an image corresponding to the job registered through the registration unit on a recording sheet; a number obtaining unit which obtains the number of recording sheets required for the job registered through the registration unit; and a setting unit which sets a rotation speed of the motor according to the number of recording sheets obtained by the number obtaining unit. The control unit controls the image forming mechanism to form the image corresponding to the job registered through the registration unit on the recording sheet by rotating the motor at the rotation speed set by the setting unit. | 12-04-2008 |
| 20090066018 | IMAGE RECORDING APPARATUS - An image recording apparatus includes a record unit; a first roller provided upstream of the record unit; a second roller provided downstream of the record unit; a motor which drives the first and second rollers; a first drive signal generation unit which generates a first drive signal based on a first rotation amount of the first roller and a first target rotation amount; a correction value generation unit which generates a correction value based on the first rotation amount and a second rotation amount of the second roller; a target value generation unit which generates a second target rotation amount based on the first target rotation amount and the correction value; a second drive signal generation unit which generates a second drive signal based on the second target rotation amount and the second rotation amount; and a controller which controls the motor by the first drive signal until a conveyed sheet reaches a position and controls the motor by the second drive signal thereafter. | 03-12-2009 |
| 20090322018 | CONVEYANCE DEVICE AND CONVEYANCE METHOD - A conveyance device includes a motor, a conveyance unit, a movement detection signal output unit, a storage unit, a time measurement unit, a first updating unit, a standby time setting unit, a second updating unit, a manipulated variable determination unit, and a motor driving unit. The standby time setting unit sets a value larger than a parameter value TX stored in the storage unit as a standby time TW. The second updating unit updates the parameter value TX stored in the storage unit to the standby time TW each time the elapsed time measured by the time measurement unit reaches the standby time TW. | 12-31-2009 |
| 20100067926 | ELECTRONIC DEVICE - An electronic device includes a carriage conveyance unit, a sheet conveyance unit, a failure detection unit, a position detection unit, and a jam determination unit. The carriage conveyance unit includes a motor and conveys a carriage in a main scanning direction by a driving force of the motor. The sheet conveyance unit conveys a sheet in a sub-scanning direction which crosses the main scanning direction in which the carriage is conveyed. The failure detection unit detects a conveyance failure of the carriage. The position detection unit detects a position of the carriage in the main scanning direction. The jam determination unit determines whether or not the conveyance failure is due to jamming caused by interference between the carriage and the sheet, based on the position of the carriage detected by the position detection unit at a time when the conveyance failure is detected by the failure detection unit. | 03-18-2010 |
| 20100123751 | IMAGE FORMING APPARATUS - An image forming apparatus includes a conveyance control unit that controls conveyance of a recording unit. The conveyance control unit switches a conveyance direction of the recording unit at return points on both sides of a scanning direction to reciprocate the recording unit, and controls a speed of the recording unit to a target speed until the recording unit reaches a control changeover point from the return point upstream in the conveyance direction. The target speed is set to be symmetrical in a zone in which the recording unit is shifted to a constant speed state from a start point of an image forming area and in a zone in which the recording unit reaches the end point of the image forming area from a deceleration start point. | 05-20-2010 |
| 20100225934 | ENCODER SIGNAL PROCESSOR, ENCODER SIGNAL PROCESSING METHOD, AND TRANSPORT APPARATUS - An encoder signal processor which processes a pulsed encoder signal output from an encoder in accordance with a travel distance of an object to be detected, including: an increasing and decreasing wave generating unit that generates an increasing and decreasing wave based on the encoder signal output from the encoder; an intermediate pulse signal generating unit that generates a binarized intermediate pulse signal based on the increasing and decreasing wave; and a multiplied pulse signal generating unit that generates a multiplied pulse signal, which is a signal obtained by multiplying the encoder signal by 2, by performing exclusive-OR operation between the encoder signal output from the encoder and the intermediate pulse signal. | 09-09-2010 |
| 20100245409 | MOTOR CONTROL DEVICE, IMAGE FORMING APPARATUS, AND MOTOR CONTROL METHOD - A motor control device includes a measurement unit, a speed control unit, a correction unit, a drive unit, and a disturbance suppressing unit. During a time period before a measurement value of speed of one of a motor and a driven object which is driven by the motor measured by the measurement unit becomes greater than zero the correction unit corrects a manipulated variable such that a reduced correction amount which is from zero percent to less than 100 percent of a correction amount determined by the disturbance suppressing unit, is added to the manipulated variable determined by the speed control unit corresponding to a target speed of the one of the motor and the driven object. | 09-30-2010 |
| 20100245450 | MOTOR CONTROL DEVICE AND IMAGE FORMING SYSTEM - A motor control device of the present invention includes a correction input unit, a measurement unit, a first signal processing unit, and a second signal processing unit. The correction input unit corrects a control input signal outputted from a controller, and inputs a corrected control input signal into a motor. The measurement unit measures a physical quantity resulting from rotation of the motor corresponding to a control output. The first signal processing unit inputs a measurement signal representing the physical quantity inputted from the measurement unit into an inverse model 1/G of a transfer function G of a controlled object, and filters an output of the inverse model 1/G through a first low-pass filter. The second signal processing unit obtains a corrected control input signal to be inputted into the motor by the correction input unit, and filters the control input signal through a second low-pass filter. | 09-30-2010 |
| 20110074856 | Conveyance Device and Image Forming Apparatus - A conveyance device includes a linear encoder that outputs an encoder signal corresponding to displacement of a conveyed object. The encoder includes an encoder fence provided on an intersecting plane that intersects a reference plane orthogonal to a direction in which a guide element supports the conveyed object. The encoder fence is configured such that a plurality of light-transmitting portions and light-shielding portions are arranged alternately on a side of the encoder fence. The light-transmitting portions and the light-shielding portions are formed so that a first point on each boundary between each of the light-transmitting portions and each of the light-shielding portions adjacent to each other and a second point on the each boundary, which is positioned separately from the first point with respect to a direction along the side of the encoder fence and perpendicular to the conveying direction, are separately positioned with respect to the conveying direction. | 03-31-2011 |
