Medium conveying apparatus for controlling current limit value of DC motor
AssigneePfu Limited
InventorYuta Arai
Life of this patent
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Abstract
A medium conveying apparatus includes a conveyance roller to convey a medium, an imaging device to image the medium, a DC motor to drive the conveyance roller, a processor to detect that a front end of the medium reaches between the conveyance roller and the imaging device, set a current limit value of the DC motor to a first limit value until the front end of the medium reaches between the conveyance roller and the imaging device, and change the current limit value to a second limit value larger than the first limit value after the front end of the medium has reached between the conveyance roller and the imaging device, and drive the conveyance roller by rotating the DC motor based on the second limit value when the imaging device performs imaging.
Claims20
A medium conveying apparatus comprising:
- a conveyance roller to convey a medium;
- an imaging device to image the medium;
- a motor to drive the conveyance roller;
- a sensor to detect a front end of the medium;
- and
- a processor to increase a current upper limit value of the motor based on a signal output from the sensor, wherein
- the motor is a DC motor.
A medium conveying apparatus comprising:
- a first roller;
- a first motor to drive the first roller;
- a second roller;
- a second motor to drive the second roller;
- an imaging device to image the medium;
- a sensor to detect a front end of the medium;
- and
- a processor to change a current limit value of the first motor with a current value of the second motor based on a signal output from the sensor.
A medium conveying apparatus comprising:
- a conveyance roller to convey a medium;
- an imaging device to image the medium;
- a motor to drive the conveyance roller;
- a processor to
- determine whether a front end of the medium reaches between the conveyance roller and the imaging device, based on a time elapsed after a start of feeding the medium,
- set a current limit value of the motor to a first limit value until the front end of the medium reaches between the conveyance roller and the imaging device, and change the current limit value to a second limit value larger than the first limit value after the front end of the medium has reached between the conveyance roller and the imaging device, and
- drive the conveyance roller by rotating the motor based on the second limit value when the imaging device performs imaging.
A medium conveying apparatus comprising:
- a conveyance roller to convey a medium;
- an imaging device to image the medium;
- a motor to drive the conveyance roller;
- a sensor to detect a front end of the medium;
- and
- a processor to increase a current upper limit value of the motor based on a signal output from the sensor, wherein
- the processor drives the conveyance roller by rotating the motor based on the increased current upper limit value when the imaging device performs imaging.
Dependencies are inferred from the claim text.