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US 2008/0165216 A1Published application
Image forming apparatus and method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorSung Ryul LEE
Life of this patent
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Abstract
An apparatus to control a velocity of a printing-paper transfer motor which is used in a series of processes of picking up paper loaded in a paper cassette, performing a printing operation and ejecting the paper to the outside of the apparatus. A motion generation unit improves a velocity control command output in a deceleration period of a velocity profile and gains and a constant are tuned at the time of design of a PID controller.
Claims19
An image forming apparatus, comprising:
- a printing device;
- a paper transferring system mounted in the printing device to transfer paper using a DC servo motor;
- a velocity sensor to measure a velocity of the DC servo motor;
- a motion generation unit to generate a velocity profile including a plurality of periods to transfer the paper and to output a velocity control command using positional information of the DC servo motor in a deceleration period of the velocity profile;
- and
- a velocity controller to output a motor control command to control the DC servo motor according to the velocity control command of the motion generation unit, wherein the motor control command uses system response characteristics of the paper transferring system.
3 more elements
An image forming apparatus, comprising:
- a printing device;
- a paper transferring system mounted in the printing device to transfer paper using a DC servo motor;
- a velocity sensor to measure a velocity of the DC servo motor;
- a motion generation unit to generate a velocity profile including a plurality of periods to transfer the paper and to output a same velocity control command at an end point of an equivelocity period and a start point of a deceleration period;
- a subtracter to supply an error signal by subtraction between the velocity control command of the motion generation unit and the motor velocity of the velocity sensor;
- a velocity controller to output a motor control command using the error signal supplied from the subtracter, a proportional gain, an integral gain and a constant corresponding to load friction;
- and
- a PWM driver to output a PWM signal to drive the DC servo motor of the paper transferring system according to the motor control command of the velocity controller.
5 more elements
An image forming apparatus, comprising:
- a paper transferring system to transfer paper using a DC servo motor;
- a velocity sensor to measure a velocity of the DC servo motor;
- a motion generation unit to output a velocity control command using positional information of the DC servo motor;
- and
- a velocity controller to output a motor control command to control the DC servo motor according to the velocity control command of the motion generation unit.
2 more elements
A method of an image forming apparatus, the method comprising:
- transferring paper using a DC servo motor;
- measuring a velocity of the DC servo motor;
- generating a velocity profile including a plurality of periods to transfer the paper and to output a velocity control command using positional information of the DC servo motor in a deceleration period of the velocity profile;
- and
- outputting a motor control command to control the DC servo motor according to the velocity control command of the motion generation unit, wherein the motor control command uses system response characteristics of the paper transferring system.
2 more elements
A method of an image forming apparatus, the method comprising:
- a transferring paper using a DC servo motor;
- measuring a velocity of the DC servo motor;
- generating a velocity profile including a plurality of periods to transfer the paper;
- outputting a same velocity control command at an end point of an equivelocity period and a start point of a deceleration period;
- supplying an error signal by subtraction between the velocity control command of the and the motor velocity;
- outputting a motor control command using the error signal, a proportional gain, an integral gain and a constant corresponding to load friction;
- and
- outputting a PWM signal to drive the DC servo motor of the paper transferring system according to the motor control command.
5 more elements
Dependencies are inferred from the claim text.