Printer
AssigneeSony Corporation
InventorsShunji Yamaguchi, Shigeyoshi Hirashima
Life of this patent
Estimating the term…
Abstract
A second driven roller that is rotated by following a second driving roller has a larger outer diameter than a first driven roller. A front edge of a recording sheet being lifted up from a first nip contacts the second driven roller, and hence the front edge does not directly hit the first driven roller. The second driven roller rotates at a higher rotational speed than a rotational speed of the first driven roller. The second driven roller gently flips the front edge of the recording sheet which has contacted the second driven roller, and leads the front edge quickly to the first nip. The front edge of the recording sheet is smoothly led to the nip.
Claims9
A printer comprising:
- a driving roller conveyance mechanism and a driven roller conveyance mechanism both arranged downstream of a print section in a conveying direction of a sheet with a conveyance path interposed between the driving roller conveyance mechanism and the driven roller conveyance mechanism,
- wherein the driving roller conveyance mechanism includes
- a first driving roller having an outer circumferential surface made of a material having a large friction coefficient, the first driving roller having a shaft center extending in a direction orthogonal to the conveying direction,
- a second driving roller having an outer circumferential surface made of a material having a smaller friction coefficient than the outer circumferential surface of the first driving roller, the second driving roller being coaxial with the first driving roller,
- a first driving mechanism configured to rotate the first driving roller so that the sheet is conveyed toward a downstream side in the conveying direction, and
- a second driving mechanism configured to rotate the second driving roller at a higher rotational speed than a rotational speed of the first driving roller so that the sheet is conveyed toward the downstream side in the conveying direction,
- wherein the driven roller conveyance mechanism includes
- a rotatable first driven roller being in contact with the first driving roller, the first driven roller having a shaft center extending in the direction orthogonal to the conveying direction,
- a rotatable second driven roller being in contact with the second driving roller, the second driven roller having a shaft center extending in the direction orthogonal to the conveying direction, the second driven roller having a larger outer diameter than the first driven roller,
- a first urging mechanism urging the first driven roller in a direction in which the first driven roller contacts the first driving roller, and
- a second urging mechanism urging the second driven roller in a direction in which the second driven roller contacts the second driving roller, and
- wherein the second driven roller is formed of a spur roller having a toothed part on an outer circumferential part of the second driven roller.
Dependencies are inferred from the claim text.