Patent application number | Description | Published |
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 |
20120081062 | Motor Control Device - A motor control device includes: a motor control unit; and a signal output unit, the motor control unit includes: a first control unit configured to estimate a current upper limit value on the basis of the rotation speed of the motor and a current decrease caused by back electromotive force, the first control unit configured to determine a control input corresponding to the estimated current upper limit value, and a second control unit configured to determine a control input to be applied to the motor on the basis of an operation amount of the motor and a target value, of the operation amount to control, the motor, and in the early period of driving of the motor, the motor is controlled by the first control unit, and in the late period of driving of the motor, the motor is controlled by the second control unit. | 04-05-2012 |
20120081063 | Motor Control Device - A motor control device comprises: an acceleration upper limit estimating unit; a target acceleration setting unit; a motor control unit; and a deficit calculating unit, wherein the target acceleration setting unit corrects the target acceleration based on the acceleration profile by an amount corresponding to the acceleration deficit within a range in which the target acceleration does not exceed the acceleration upper limit on the basis of the acceleration deficit calculated by the deficit calculating unit to set the target acceleration at each time. | 04-05-2012 |
20120249036 | Motor Control Apparatus and Image Forming Apparatus - A motor control apparatus includes a target acceleration setting unit, a control unit, an acceleration upper limit estimation unit, a mode switching unit, a detection unit and a trajectory setting unit, wherein the mode switching unit controls the target acceleration setting unit to execute a first setting processing, in which the target acceleration at each time point is set corresponding to a first target acceleration trajectory in which the target acceleration at each time point is set corresponding to a first target acceleration trajectory, a second setting processing in which a target acceleration is set corresponding to the acceleration upper limit, or a third setting processing in which the target acceleration is set corresponding to the second target acceleration trajectory, based on the acceleration upper limit, the target acceleration, the speed of the motor. | 10-04-2012 |
20120251213 | MOTOR CONTROL APPARATUS AND IMAGE FORMING APPARATUS - A motor control apparatus including a motor control unit and a signal output unit that outputs a signal corresponding to rotation of the motor to displace an object to be driven to a target stop position, the motor control unit includes: a first control unit that estimates a current upper limit and determines a first control input; a second control unit that determines a second control input and controls the motor to stop the object to be driven at the target stop position; a first calculation unit calculates a necessary amount for stop, a second calculation unit that calculates a remaining displacement amount, a switching unit, enable the first control unit or the second control unit to control the motor with switching; based on the necessary amount for stop and the remaining displacement amount. | 10-04-2012 |
20130070013 | Motor Control Device and Image Forming Apparatus - A motor control device comprises: a motor control unit that controls a motor; and a signal output unit that outputs a signal according to rotation of the motor, wherein the motor control unit controls the motor based on an output signal of the signal output unit so that a driven object driven by the motor is displaced to a target stop position. The motor control unit is configured to function as: a first control unit that estimates a upper current limit and controls the motor according to the upper current limit; a second control unit that controls motor according to an operated amount of at least one of the motor or the driven object; a switching unit that switches between the first control unit and the second control unit; a first calculating unit that calculates an amount necessary for stop; and a second calculating unit. | 03-21-2013 |
20130070014 | Motor Control Device and Image Forming Apparatus - A motor control device comprises: a motor control unit; and a signal output unit, wherein the motor control unit controls a motor based on an output signal of the signal output unit, wherein the motor control unit is configured to function as: a first control unit performs a first motor control, in which a current upper limit is estimated based on a rotation speed of the motor and is input to the motor, a second control unit performs a second motor control, in which a second driving current, which is a driving current lower than the first driving current at the end of the first motor control is input, a third control unit performs a third motor control, in which a third driving current to be input to the motor is determined, and a switching unit that sequentially switches the first, second, and third control units. | 03-21-2013 |
20130257953 | Image Forming Apparatus - An image forming apparatus includes a recording head which jets ink droplets, a head transporting mechanism which transports the recording head, and a control unit which controls the head transporting mechanism to reciprocate the recording head along a transporting path and controls the recording head to form an image on a sheet by jetting the ink droplets when the recording head passes over an image formation area within the transporting path. When the control unit controls the transporting mechanism to transport the recording head toward a turn-around point in the transporting path, the control unit decelerates the recording head in accordance with a first acceleration profile and a second acceleration profile which has a peak of deceleration higher than that of the first acceleration profile. | 10-03-2013 |
20130257983 | Image Recording Apparatus - An image recording apparatus includes a carriage which moves in a main scanning direction, a recording head which is installed on the carriage, and which records an image on a sheet, a drive section which has a motor, and which applies a driving force to the carriage, a guide member which guides the carriage in the main scanning direction, a first contact portion which is provided to the carriage and which contacts with the guide member, a second contact portion which is provided to sandwich a center of gravity of the carriage between the first contact portion and the second contact portion and which contacts with the guide member, and a friction-force adjusting section which adjusts a friction force acting between the guide member and the first contact portion in accordance with an acceleration of the carriage. | 10-03-2013 |
20140063112 | CONTROL DEVICE AND IMAGE FORMING SYSTEM - There is provided a control device configured to control a drive system including a motor and a driven object. The control device includes a controller configured to compute an operation amount, to measure a control amount of the controlled object, to input a measurement signal of the control amount to an inverse model of a model indicating input-output characteristics of the controlled object, and to generate a differential signal between an output of the inverse model and the operation amount; and a filter configured to filter the generated differential signal, and which has frequency characteristics of attenuating a vibrational component which is developed due to mechanical characteristics of the controlled object, from the differential signal. The controller is configured to make a judgment of whether or not a defect has occurred in the controlled object, based on an output of the filter. | 03-06-2014 |
20140291926 | Transporting System, Image Forming System, and Controller - There is provided a transporting system including two rollers to transport a sheet, two driving devices to drive the rollers, two measuring devices to measure state quantities Z1 and Z2 concerning the rollers, and a controller to control the transport. The controller includes first and second estimating units to estimate values R1 and R2 related to reaction forces act on the rollers, a first calculating unit to calculate control input U1 in accordance with a deviation between a target state quantity and (Z1+Z2)/2, a second calculating unit to calculate control input U2 in accordance with a deviation between a target value and (R1−R2)/2, a first drive controller to input a control signal in accordance with (U1+U2) to the first driving device, and a second drive controller to input a control signal in accordance with (U1−U2) to the second driving device. | 10-02-2014 |
20140292874 | Transporting System, Image Forming System, and Controller - There is provided a transporting system including two rollers to transport a sheet, two driving devices to drive the rollers, two measuring devices, and a controller to control the transport. The controller includes two estimating units to estimate values R1 and R2 related to reaction forces act on the rollers, a first calculating unit to calculate a control input U1, a second calculating unit to calculate a control input U2 in accordance with a deviation between a target value and (R1−R2)/2, first and second drive controllers to input a control signal in accordance with U1 and U2 to the first and second driving devices, and a setting unit. In an initial stage of a period in which the sheet is transported by the two rollers, the setting unit sets the target value to a value greater than that of the target value after the initial stage. | 10-02-2014 |
20150061207 | Transport System, Image Forming System, and Control Device - There is provided a transport system including: a transport mechanism including first and second rollers; first and second driving devices; first and second measuring devices configured to measure a state quantities Z1 and Z2; and a controller configured to control the first and second driving devices. The controller is configured to perform: estimating reaction forces R1 and R2; calculating control inputs U1 and U2; inputting, to the first driving device, a control signal in accordance with a sum of the control input U1 and the control input U2; inputting, to the second driving device, a control signal in accordance with a difference between the control input U1 and the control input U2; estimating non-tensional components RE1 or RE2; and correcting the control input U2 to prevent a control error caused by the non-tensional components RE1 and RE2 included in an estimated tension of the sheet (R1−R2)/2. | 03-05-2015 |