Abstract: A DC motor control method and apparatus for reducing time required for deceleration without degrading positioning accuracy. In a device which drives a mechanism by using a DC motor as a power source, in deceleration of the DC motor, when the mechanism arrives at a predetermined position, a velocity command value to the motor, generated in accordance with a cubic function having a mild curve profile, is changed to a constant value, thus the velocity is discontinuously reduced.

Abstract: When torque of a DC motor is dropped down to zero at a stop position, force is generated by deformation of a member for transmitting the torque of the DC motor. The force moves the driven body which is in the stopped state, which results in a shift of the driven body from the stop position. Therefore, a process for stopping the driven body is performed according to the amount of shift by an encoder which periodically outputs a pulse signal according to movement of the driven body, a unit for acquiring velocity information and position information of the driven body based on the pulse signal, a controlling unit for controlling a moving unit based on the velocity information and the position information, and a unit for calculating the amount of shift, which is caused by the force generated by the deformation of the member for transmitting the torque, at the stop position of the driven body.

Abstract: A motor control apparatus which can improve detection accuracy of control information and stabilize a control system includes a detector for detecting first pulse information which corresponds to the drive speed of a driven object and second pulse information out of phase with the first pulse information; edge detectors for detecting rising edges and falling edges of the detected first pulse information and second pulse information; edge interval measuring units for measuring edge-to-edge periods using the detected rising edges and falling edges; a calibrator for calibrating the measured edge-to-edge periods with a reference period for driving the driven object at constant speed; a corrector for correcting the first pulse information and second pulse information based on the calibration; and a controller for generating control commands to drive the driven object based on the corrected first pulse information and second pulse information.

Abstract: In controlling a motor in a device which drives a mechanism using the motor as a power source, in executing driving, an ideal profile of the driving is generated in accordance with a target position and a preset initial parameter, driving of the motor is controlled in accordance with the profile, the value of the initial parameter is evaluated at the end of driving, and the value of the initial parameter is changed in accordance with the evaluation result. High-speed accurate position control can be achieved independently of the characteristic of an individual motor to be used.

Abstract: In controlling a motor in a device which drives a mechanism using the motor as a power source, pre-driving of giving a predetermined driving parameter to the motor and driving the mechanism is executed. During the pre-driving, movement of the mechanism is monitored, and a command value to the motor, which is necessary for starting the mechanism, is obtained. Driving of the motor is controlled using feedback using the command value as the initial value of the driving parameter. High-speed accurate position control can be achieved independently of the individual difference in an object to be controlled and the frictional force of the mechanical portion or the difference in use environment.

Abstract: Control of a motor in a device in which a mechanism is driven using the motor as the power source is achieved by providing velocity servo-control means for outputting first command information regarding the motor based upon a preset velocity profile and information relating to velocity of the mechanism, and position servo-control means for outputting second command information regarding the motor based upon a preset position profile and information relating to position of the mechanism. A motor driving signal is generated, based upon the first and second command information, in a region in which the mechanism is to be accelerated in the velocity profile. As a result, target-velocity attainment time is shortened and velocity fluctuation after attainment of the target velocity is reduced.

Abstract: A motor control apparatus which can improve detection accuracy of control information and stabilize a control system includes a detector (601) for detecting first pulse information which corresponds to drive speed of a driven object and second pulse information out of phase with the first pulse information; edge detectors (604 to 607) for detecting rising edges and falling edges of the detected first pulse information and second pulse information; edge interval measuring units (608 to 611) for measuring edge-to-edge periods using the detected rising edges and falling edges; a calibrator for calibrating the measured edge-to-edge periods with a reference period for driving the driven object (615) at constant speed; a corrector for correcting the first pulse information and second pulse information based on the calibration; and controller (613) for generating control commands to drive the driven object based on the corrected first pulse information and second pulse information.

Abstract: In cross control in sub-scanning (LF) and main scanning (CR), to avoid the risk of skew printing and increase the processing speed, a supposed settling time in the next sub-scanning cycle is obtained on the basis of the history information of the sub-scanning settling time of a printing apparatus, and a supposed idle time from the start of the next main scanning driving cycle to the start of printing is obtained on the basis of the history information of the main scanning acceleration required time. It is determined using the supposed settling time and supposed idle time whether cross control in which main scanning driving starts before the end of sub-scanning driving can be executed in next print scanning processing. If it is possible, the time difference from the start of sub-scanning driving to the start of main scanning driving is determined using the supposed settling time and the supposed idle time.

Abstract: In the ink jet recording apparatus, while the formation of an image on the present sheet is in progress, the remaining length-to-rear end Le between the point at which the presence of the sheet is detected by the sheet detection sensor to the rear end of the present sheet and the remaining recording time Tr from the present time point to the time point at which the formation of the image on the present sheet is completed are measured. Further, in the apparatus, the sheet for the next page is supplied from the feed sheet unit when it is found that that the formation of the image on the sheet for the next page is necessary, that the remaining length-to-rear end Le is less than the reference remaining length-to-rear end Lr, and that the remaining recording time Tr is less than the reference remaining recording time TrR.

Abstract: In a printing apparatus which prints using a printhead, a printing controller for feedback-controlling driving of the printing apparatus includes a control information generation unit which generates control information for controlling driving of a motor on the basis of the first driving pattern, a comparison unit which compares the control information and a threshold for determining an overload on driving of the motor, and a setting unit which sets the second driving pattern for changing a load on driving of the motor by the control information, instead of the first driving pattern on the basis of the comparison result of the comparison unit. Control of the motor is switched in accordance with the load state.

Abstract: An area on the printing sheet which can be printed through a single scanning operation of a printing head is divided into a plurality of smaller areas. The printing sheet is transported a distance corresponding to each divided area to print the image using different nozzles of the printing head for each divided area. When a back end portion of the printing sheet is printed, the distance transported is reduced to set inoperative nozzles that are not used for the printing operation. Then, when the printing sheet slips out from the upstream roller pair and it is then detected that the printing sheet is to be transported a distance longer than predetermined amount of rotation of the roller, the inoperative nozzles are used to shift an operative nozzle range depending on the extra amount of rotation. Thus, the extra transportation of the printing sheet is corrected.

Abstract: In a sheet member conveying apparatus having a roller for conveying a sheet member, a motor for driving the roller, a driving transmitter for transmitting a driving force of the motor to the roller, and a detector for detecting position and speed of the roller, control is executed by a step of detecting a periodic speed or torque change of the roller as a period profile, a step of judging a specific phase angle in the period profile as an origin, a step of correlating an offset phase angle having a specific offset from the origin with an optimal suspension phase angle on the period profile, which is a phase angle to suspend the roller, and a step of controlling the suspension phase angle on the period profile at which the roller is suspended to become optimal, thereby suppressing an influence by torque and speed changes of the motor.

Abstract: A recording apparatus includes a conveying mechanism control unit which performs a first processing and a second processing almost simultaneously, when it is detected that a recording medium has reached a stop position. The first processing is to make invalid the output of a servo computing device and make effective the output in accordance with an output-for-stop setting register. The second processing is to generate an auto stop interrupt to inform that the output in accordance with the output-for-stop setting register is made effective. With this configuration, the recording apparatus enables the increase in speed of a stop operation control processing of a DC motor for use in conveying a recording medium and the improvement of the stop position accuracy of the recording medium.

Abstract: Control of a motor in a device in which a mechanism is driven using the motor as the power source is achieved by providing velocity servo-control means for outputting first command information regarding the motor based upon a preset velocity profile and information relating to velocity of the mechanism, and position servo-control means for outputting second command information regarding the motor based upon a preset position profile and information relating to position of the mechanism. A motor driving signal is generated, based upon the first and second command information, in a region in which the mechanism is to be accelerated in the velocity profile. As a result, target-velocity attainment time is shortened and velocity fluctuation after attainment of the target velocity is reduced.

Abstract: A digital encoder control method of a digital control apparatus has a driving unit, a frequency signal generating unit for generating a pulse signal of a frequency according to a driving velocity of a driven member which is driven by the driving unit, an edge detecting unit for detecting a rising-up edge and a falling-down edge of the pulse signal, and a period data detecting unit for counting period data between edges detected by the edge detecting unit. Each time the edges are detected by the edge detecting unit, the period data between the same edges as the detected edges is outputted as control velocity data of the driving unit.

Abstract: In cross control in sub-scanning (LF) and main scanning (CR), to avoid the risk of skew printing and increase the processing speed, a supposed settling time in the next sub-scanning cycle is obtained on the basis of the history information of the sub-scanning settling time of a printing apparatus, and a supposed idle time from the start of the next main scanning driving cycle to the start of printing is obtained on the basis of the history information of the main scanning acceleration required time. It is determined using the supposed settling time and supposed idle time whether cross control in which main scanning driving starts before the end of sub-scanning driving can be executed in next print scanning processing. If it is possible, the time difference from the start of sub-scanning driving to the start of main scanning driving is determined using the supposed settling time and the supposed idle time.

Abstract: In controlling a motor in a device which drives a mechanism using the motor as a power source, in executing driving, an ideal profile of the driving is generated in accordance with a target position and a preset initial parameter, driving of the motor is controlled in accordance with the profile, the value of the initial parameter is evaluated at the end of driving, and the value of the initial parameter is changed in accordance with the evaluation result. High-speed accurate position control can be achieved independently of the characteristic of an individual motor to be used.

Abstract: In controlling a motor in a device which drives a mechanism using the motor as a power source, pre-driving of giving a predetermined driving parameter to the motor and driving the mechanism is executed. During the pre-driving, movement of the mechanism is monitored, and a command value to the motor, which is necessary for starting the mechanism, is obtained. Driving of the motor is controlled using feedback using the command value as the initial value of the driving parameter. High-speed accurate position control can be achieved independently of the individual difference in an object to be controlled and the frictional force of the mechanical portion or the difference in use environment.

Abstract: An area on the printing sheet which can be printed through a single scanning operation of a printing head is divided into a plurality of smaller areas. The printing sheet is transported a distance corresponding to each divided area to print the image using different nozzles of the printing head for each divided area. When a back end portion of the printing sheet is printed, the distance transported is reduced to set inoperative nozzles that are not used for the printing operation. Then, when the printing sheet slips out from the upstream roller pair and it is then detected that the printing sheet is to be transported a distance longer than predetermined amount of rotation of the roller, the inoperative nozzles are used to shift an operative nozzle range depending on the extra amount of rotation. Thus, the extra transportation of the printing sheet is corrected.

Abstract: A DC motor control method and apparatus for reducing time required for deceleration without degrading positioning accuracy. In a device which drives a mechanism by using a DC motor as a power source, in deceleration of the DC motor, when the mechanism arrives at a predetermined position, a velocity command value to the motor, generated in accordance with a cubic function having a mild curve profile, is changed to a constant value, thus the velocity is discontinuously reduced.