Medium transport device and image reading device
AssigneeSeiko Epson Corporation
InventorsMasaki Namiki, Kendai Kawakami
Life of this patent
Estimating the term…
Abstract
A medium transport device includes: a feeding roller that feeds a medium mounted on a medium mounting section; a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream and a second rotation direction that is opposite to the first rotation direction; a pressing member that presses the separation roller against the feeding roller; a pressing force change portion that changes a pressing force of the pressing member; and a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion.
Claims13
A medium transport device comprising:
- a feeding roller that feeds a medium mounted on a medium mounting section;
- a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream in a transport direction and a second rotation direction that is opposite to the first rotation direction;
- a pressing member that generates a pressing force for pressing the separation roller against the feeding roller;
- a pressing force change portion that changes the pressing force of the pressing member;
- a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion;
- and
- a control unit that drives the pressing force change portion to change the pressing force of the pressing member,
- wherein the control unit changes the pressing force of the pressing member and changes a rotation speed of the separation roller.
A medium transport device comprising:
- a feeding roller that feeds a medium mounted on a medium mounting section;
- a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream in a transport direction and a second rotation direction that is opposite to the first rotation direction;
- a pressing member that generates a pressing force for pressing the separation roller against the feeding roller;
- a pressing force change portion that changes the pressing force of the pressing member;
- and
- a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion, wherein
- a one-way clutch is provided on a transmission path through which the driving force is transmitted from the drive source to the pressing force change portion, and
- the drive source transmits, via the one-way clutch, the driving force for rotating the separation roller in the second rotation direction when rotating forward, and transmits the driving force for changing the pressing force to the pressing force change portion when rotating in reverse.
A medium transport device comprising:
- a feeding roller that feeds a medium mounted on a medium mounting section;
- a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream in a transport direction and a second rotation direction that is opposite to the first rotation direction;
- a pressing member that generates a pressing force for pressing the separation roller against the feeding roller;
- a pressing force change portion that changes the pressing force of the pressing member;
- a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion;
- a thickness detection unit that detects a thickness of the medium;
- and
- a control unit,
- wherein the control unit drives the pressing force change portion to change the pressing force of the pressing member based on a detection result of the thickness detection unit.
Dependencies are inferred from the claim text.