Medium conveying apparatus to correct skew of medium using second roller while moving first roller to be spaced apart from medium
AssigneePfu Limited
InventorShogo Yoshita
Life of this patent
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Abstract
A medium conveying apparatus includes a first roller to convey a medium, a movement mechanism to move the first roller between a first position in contact with the medium and a second position spaced apart from the medium, a second roller located on a downstream side of the first roller in a medium conveying direction to convey the medium, and a processor to detect a skew of the conveyed medium, and control the movement mechanism to move the first roller to the second position, and correct the skew of the medium using the second roller when the skew of the medium is detected.
Claims20
A medium conveying apparatus comprising:
- a first roller to convey a medium;
- a solenoid or a motor, to move the first roller between a first position in contact with the medium and a second position spaced apart from the medium;
- a second roller located on a downstream side of the first roller in a medium conveying direction to convey the medium;
- a plurality of first medium sensors located apart from each other in a direction perpendicular to the medium conveying direction and on a downstream side of the second roller;
- an imaging device located on a downstream side of the first medium sensors in the medium conveying direction;
- a second medium sensor located between the first medium sensors and the imaging device in the medium conveying direction;
- and
- a processor to
- determine whether a skew of the conveyed medium has occurred, and
- control the solenoid or the motor to move the first roller from the first position to the second position, and execute a correction of the skew of the conveyed medium for orienting a front end of the medium to a downstream side of the medium conveying direction, using the second roller when it is determined that the skew of the conveyed medium has occurred, and
- control the solenoid or the motor to return the first roller from the second position to the first position so that the first roller is in contact with the conveyed medium the skew of which is corrected after the correction of the skew of the medium is started, for orienting the front end of the medium to the downstream side of the medium conveying direction, wherein
- the processor determines whether the skew of the conveyed medium has occurred based on output signals from the first medium sensors, and wherein
- the processor controls the solenoid or the motor to return the first roller to the first position when the conveyed medium passes through a position of the second medium sensor.
A method for correcting a skew of a medium, comprising:
- conveying the medium, by a first roller;
- moving the first roller between a first position in contact with the medium and a second position spaced apart from the medium, by a solenoid or a motor;
- conveying the medium, by a second roller located on a downstream side of the first roller in a medium conveying direction;
- detecting the skew of the conveyed medium,
- controlling the solenoid or the motor to move the first roller from the first position to the second position, and executing a correction of the skew of the conveyed medium for orienting a front end of the medium to a downstream side of the medium conveying direction, using the second roller when the skew of the conveyed medium is detected, and
- controlling the solenoid or the motor to return the first roller from the second position to the first position so that the first roller is in contact with the conveyed medium the skew of which is corrected after the correction of the skew of the medium is started, for orienting the front end of the medium to the downstream side of the medium conveying direction, wherein
- the skew of the conveyed medium is detected based on output signals from a plurality of first medium sensors located apart from each other in a direction perpendicular to the medium conveying direction and on a downstream side of the second roller, and wherein
- the solenoid or the motor is controlled to return the first roller to the first position when the conveyed medium passes through a position of a second medium sensor located between the first medium sensors and an imaging device located on a downstream side of the first medium sensors in the medium conveying direction.
A computer-readable, non-transitory medium storing a computer program, wherein the computer program causes a medium conveying apparatus including a first roller to convey a medium, a solenoid or a motor to move the first roller between a first position in contact with the medium and a second position spaced apart from the medium, a second roller located on a downstream side of the first roller in a medium conveying direction to convey the medium, a plurality of first medium sensors located apart from each other in a direction perpendicular to the medium conveying direction and on a downstream side of the second roller, an imaging device located on a downstream side of the first medium sensors in the medium conveying direction, and a second medium sensor located between the first medium sensors and the imaging device in the medium conveying direction, to execute a process, the process comprising:
- detecting the skew of the conveyed medium;
- controlling the solenoid or the motor to move the first roller from the first position to the second position, and executing a correction of the skew of the conveyed medium for orienting a front end of the medium to a downstream side of the medium conveying direction, using the second roller when the skew of the conveyed medium is detected, and
- controlling the solenoid or the motor to return the first roller from the second position to the first position so that the first roller is in contact with the conveyed medium the skew of which is corrected after the correction of the skew of the medium is started, for orienting the front end of the medium to the downstream side of the medium conveying direction, wherein
- the skew of the conveyed medium is detected based on output signals from the first medium sensors, and wherein
- the solenoid or the motor is controlled to return the first roller to the first position when the conveyed medium passes through a position of the second medium sensor.
Dependencies are inferred from the claim text.