Abstract: An embodiment of this invention is directed to ink droplet landing correction by a carriage scanning velocity. According to the embodiment, upon updating a correction value only in a case where a velocity difference is equal to or more than a predetermined value, possibility that ideal correction is not executed in an acceleration/deceleration region, and unnecessary correction occurs in a constant velocity moving region is reduced. More specifically, two velocity thresholds are set so as to sandwich a predetermined velocity of a servo profile. When the carriage scanning velocity falls in the range between the velocity thresholds, updating the correction value of the landing correction function is suppressed.

Abstract: An embodiment of this invention is directed to ink droplet landing correction by a carriage scanning velocity. According to the embodiment, upon updating a correction value only in a case where a velocity difference is equal to or more than a predetermined value, possibility that ideal correction is not executed in an acceleration/deceleration region, and unnecessary correction occurs in a constant velocity moving region is reduced. More specifically, two velocity thresholds are set so as to sandwich a predetermined velocity of a servo profile. When the carriage scanning velocity falls in the range between the velocity thresholds, updating the correction value of the landing correction function is suppressed.

Abstract: Driving circuitry having driving means for driving a load using a first DC voltage, regulator means for receiving an input voltage and deriving a regulated output voltage from the input voltage, and power source switch means switchable between a first state in which the first DC voltage is supplied to the regulator means as the input voltage and a second state in which a second DC voltage, lower than the first DC voltage and higher than the regulated output voltage, is supplied to the regulator means as the input voltage, second voltage deriving means for deriving the second DC voltage from the first DC voltage, and switch control means connected to the power source switch means for causing the power source switch means to switch from the first state to the second state when the second DC voltage is suitable for supply to the regulator means as the input voltage.

Abstract: This invention relates to a printing apparatus and a conveyance control method capable of allowing even an arrangement having a plurality of conveyance rollers in a printing medium conveyance path to accurately control conveyance of a printing medium. According to this invention, a first encoder detects a conveyance amount by a first conveyance roller, provided in a conveyance path, for conveying a printing medium. A second encoder detects a conveyance amount by a second conveyance roller provided in the conveyance path in the conveyance direction of the printing medium at the downstream side of the first conveyance roller for conveying the printing medium. On the other hand, a signal output from the first or second encoder is selected on the basis of the position of the printing medium on the conveyance path. Conveyance of the printing medium is controlled on the basis of the selected output signal.

Abstract: Serial data transfer method, electric device and printing apparatus for enabling various controls without adding signal lines and control signals to serial data transfer utilizing, e.g., three signal lines for transferring a data signal, a clock signal, and a strobe signal.

Abstract: An integrated circuit includes a trigger signal generating unit configured to generate a trigger signal for setting a control unit connected thereto in a reset state, an input unit configured to input a DC voltage of a predetermined voltage value, a pulse signal generating unit configured to generate and output a pulse signal with the predetermined voltage value to a power supply unit configured to generate a voltage to be supplied to the control unit with a coil and a capacitor, a detecting unit configured to detect generation of an event which requires an output of the trigger signal, a stopping unit configured to stop outputting of the pulse signal based on a detection result from the detecting unit, and an output unit configured to output the trigger signal generated by the trigger signal generating unit after outputting of the pulse signal is stopped and a predetermined condition is satisfied.

Abstract: Driving circuitry having driving means for driving a load using a first DC voltage, regulator means for receiving an input voltage and deriving a regulated output voltage from the input voltage, and power source switch means switchable between a first state in which the first DC voltage is supplied to the regulator means as the input voltage and a second state in which a second DC voltage, lower than the first DC voltage and higher than the regulated output voltage, is supplied to the regulator means as the input voltage, second voltage deriving means for deriving the second DC voltage from the first DC voltage, and switch control means connected to the power source switch means for causing the power source switch means to switch from the first state to the second state when the second DC voltage is suitable for supply to the regulator means as the input voltage.

Abstract: An integrated circuit includes a trigger signal generating unit configured to generate a trigger signal for setting a control unit connected thereto in a reset state, an input unit configured to input a DC voltage of a predetermined voltage value, a pulse signal generating unit configured to generate and output a pulse signal with the predetermined voltage value to a power supply unit configured to generate a voltage to be supplied to the control unit with a coil and a capacitor, a detecting unit configured to detect generation of an event which requires an output of the trigger signal, a stopping unit configured to stop outputting of the pulse signal based on a detection result from the detecting unit, and an output unit configured to output the trigger signal generated by the trigger signal generating unit after outputting of the pulse signal is stopped and a predetermined condition is satisfied.

Abstract: This invention relates to a printing apparatus and a conveyance control method capable of allowing even an arrangement having a plurality of conveyance rollers in a printing medium conveyance path to accurately control conveyance of a printing medium. According to this invention, a first encoder detects a conveyance amount by a first conveyance roller, provided in a conveyance path, for conveying a printing medium. A second encoder detects a conveyance amount by a second conveyance roller provided in the conveyance path in the conveyance direction of the printing medium at the downstream side of the first conveyance roller for conveying the printing medium. On the other hand, a signal output from the first or second encoder is selected on the basis of the position of the printing medium on the conveyance path. Conveyance of the printing medium is controlled on the basis of the selected output signal.

Abstract: High accuracy is achieved in paper feed control without increasing the size of an encoder, which would result in an increase in cost. The velocity of a paper feeding mechanism is calculated from an edge signal that is generated by the encoder in response to the motion of the paper feeding mechanism. Based on the calculated velocity, a calculation is performed as to the time needed to reach a stop position since a detection of an encoder signal edge immediately before the stop position. Based on the calculated time, a control signal for stopping the paper feeding mechanism is generated.

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: 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: High accuracy is achieved in paper feed control without increasing the size of an encoder, which would result in an increase in cost. The velocity of a paper feeding mechanism is calculated from an edge signal that is generated by the encoder in response to the motion of the paper feeding mechanism. Based on the calculated velocity, a calculation is performed as to the time needed to reach a stop position since a detection of an encoder signal edge immediately before the stop position. Based on the calculated time, a control signal for stopping the paper feeding mechanism is generated.

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 printing apparatus is equipped with a filter mechanism for achieving optimum digital encoder signal filtering so as to realize precise position control, for example. The printing apparatus filters out high-frequency noise overlaying a detection signal generated when detecting the position of a carriage on which a printhead is mounted and reciprocally moved in a first direction in such a way as to reflect the state of movement of the carriage and controls the printhead based on the filtered detection signal from which the noise is filtered out. Further, the printing apparatus may be configured to filter out high-frequency noise overlaying a detection signal generated by detecting a position of a printing medium according to conditions that reflect the state of conveyance by a conveyance mechanism and perform conveyance control of the printing medium based on the noise-filtered detection signal.

Abstract: High accuracy is achieved in paper feed control without increasing the size of an encoder, which would result in an increase in cost. The velocity of a paper feeding mechanism is calculated from an edge signal that is generated by the encoder in response to the motion of the paper feeding mechanism. Based on the calculated velocity, a calculation is performed as to the time needed to reach a stop position since a detection of an encoder signal edge immediately before the stop position. Based on the calculated time, a control signal for stopping the paper feeding mechanism is generated.

Abstract: Serial data transfer method, electric device and printing apparatus for enabling various controls without adding signal lines and control signals to serial data transfer utilizing, e.g., three signal lines for transferring a data signal, a clock signal, and a strobe signal.

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: The present invention provides an ink jet printing apparatus and method that can print a high-grade image without being affected by a variation in moving speed of a printing head. To accomplish this, an encoder is used which outputs a pulse each time a printing head and a printing medium are moved a specified amount relative to each other. Driving timings with which ink is ejected from the printing head are adjusted depending on the time interval between the pulses.

Abstract: High accuracy is achieved in paper feed control without increasing the size of an encoder, which would result in an increase in cost. The velocity of a paper feeding mechanism is calculated from an edge signal that is generated by the encoder in response to the motion of the paper feeding mechanism. Based on the calculated velocity, a calculation is performed as to the time needed to reach a stop position since a detection of an encoder signal edge immediately before the stop position. Based on the calculated time, a control signal for stopping the paper feeding mechanism is generated.