Ink-jet recording apparatus

1. An ink-jet recording apparatus comprising:

a transporting roller provided in a transport path through which a recording medium is guided, and configured to transport the recording medium along the transport path in a transporting direction;

a driven roller provided opposite the transporting roller to sandwich the recording medium between the driven roller and the transporting roller to transport the recording medium along the transport path, while moving in an approaching-departuring direction to approach to or depart from the transporting roller based on a thickness of the recording medium sandwiched between the driven roller and the transporting roller;

a first biasing member biasing the driven roller to the transporting roller;

a platen provided below the transport path on a downstream side from the transporting roller in the transporting direction, and configured to support the recording medium transported through the transport path;

a recording portion provided above the transport path to face the platen, and configured to jet ink droplets from nozzles to record an image on the recording medium supported on the platen; and

a cooperative portion configured to move along with movement of the driven roller in the approaching-departuring direction to move the platen,

wherein the cooperative portion comprises:

a support member rotatably supporting the driven roller and integrally moving with the driven roller;

a contact portion disposed on the platen and configured to come into contact with the support member;

a contacted portion disposed on the support member to be contacted by the contact portion; and

a second biasing member biasing the platen to the support member, and

wherein the platen moves in resistance to a biasing force of the second biasing member due to the contact portion being pressed by the contacted portion.

2. The ink-jet recording apparatus according to claim 1 further comprising a discharge roller provided below the transport path on a downstream side from the platen in the transporting direction, and configured to transport the recording medium in the transporting direction,

wherein the platen is configured to rotate about a shaft of the discharge roller; and

the contact portion is disposed on a rotating end portion of the platen.

3. The ink-jet recording apparatus according to claim 1 , wherein the contact portion and the contacted portion include a plurality of contact portions and a plurality of contacted portions, respectively, spaced apart in a width direction perpendicular to the transporting direction; and

the second biasing member includes a plurality of second biasing members provided at positions facing the contact portions and the contacted portions in the width direction.

4. The ink-jet recording apparatus according to claim 3 , wherein the plurality of contact portions, the plurality of contacted portions and the plurality of second biasing members are provided symmetrically from a central portion of the platen in the width direction, respectively.

5. The ink-jet recording apparatus according to claim 1 further comprising:

a plurality of holding portions provided apart in a width direction perpendicular to the transporting direction at positions facing the platen on an upstream side to the nozzles in the transporting direction, and configured to come into contact with an image recording surface of the recording medium supported on the platen; and

a projection provided on an upper surface of the platen to project upward above lower ends of the holding portions at a position between a pair of holding portions of the plurality of holding portions in the width direction.

6. The ink-jet recording apparatus according to claim 5 , wherein the projection includes a plurality of projections each of which is disposed between a respective pair of holding portions of the plurality of holding portions.

7. The ink-jet recording apparatus according to claim 5 , wherein the projection extends up to a downstream side of the holding portions in the transporting direction.

8. The ink-jet recording apparatus according to claim 5 , wherein the cooperative portion comprises:

a support member rotatably supporting the driven roller and integrally moving with the driven roller,

a contact portion disposed on the platen and configured to come into contact with the support member,

a contacted portion disposed on the support member to be contacted by the contact portion, and

a second biasing member biasing the platen to the support member;

the support member is kept at position by a biasing force of the first biasing member in the approaching-departuring direction under a condition that the recording medium is sandwiched between the platen and the holding portions; and the platen moves in such a direction that the contact portion departs from the contacted portion in resistance to a biasing force of the second biasing member due to the recording medium sandwiched between the platen and the holding portions.

9. The ink-jet recording apparatus according to claim 8 further comprising a discharge roller provided below the transport path on a downstream side of the platen in the transporting direction, and configured to transport the recording medium in the transporting direction,

wherein the platen is configured to rotate about a shaft of the discharge roller; and the contact portion is disposed on a rotating end portion of the platen.

10. The ink-jet recording apparatus according to claim 8 , wherein the contact portion and the contacted portion include a plurality of contact portions and a plurality of contacted portions, respectively, provided in the width direction perpendicular to the transporting direction; and

the second biasing member includes a plurality of second biasing members which are provided at positions facing the plurality of contact portions and the plurality of contacted portions in the width direction.

11. The ink-jet recording apparatus according to claim 10 , wherein the plurality of contact portions, the plurality of contacted portions and the plurality of second biasing members are provided symmetrically from a central portion of the platen in the width direction, respectively.

12. The ink-jet recording apparatus according to claim 1 , further comprising:

a plurality of projections provided on an upper surface of the platen; and

a holding portion provided in a width direction perpendicular to the transporting direction at a position facing the platen on an upstream side to the nozzles in the transporting direction,

wherein a lower end of the holding portion is located below an upper end of each of the projections, and

the holding portion is located at a position between a pair of projections of the plurality of projections in the width direction.

13. The ink-jet recording apparatus according to claim 12 , wherein the holding portion is formed as a plurality of holding portions each of which is disposed between a respective pair of the projections of the plurality of projections.

14. The ink-jet recording apparatus according to claim 1 , wherein the transporting roller is provided above the transport path; and the driven roller is provided below the transport path.

15. An ink-jet recording apparatus, comprising:

a transporting roller provided in a transport path through which a recording medium is guided, and configured to transport the recording medium along the transport path in a transporting direction;

a driven roller provided to face the transporting roller, and configured to sandwich the recording medium between the driven roller and the transporting roller to transport the recording medium along the transport path, while moving in an approaching-departuring direction to approach to or depart from the transporting roller based on a thickness of the recording medium sandwiched between the driven roller and the transporting roller;

a first biasing member biasing the driven roller to the transporting roller;

a platen provided below the transport path on a downstream side of the transporting roller in the transporting direction, and configured to support the recording medium transported through the transport path;

a recording portion provided above the transport path to face the platen, and configured to jet ink droplets from nozzles formed in the recording portion to record an image on the recording medium supported on the platen;

a support member rotatably supporting the driven roller and integrally moving with the driven roller;

a contact portion disposed on the platen and configured to come into contact with the support member;

a contacted portion disposed on the support member to be contacted by the contact portion; and

a second biasing member biasing the platen to the support member,

wherein the platen moves in such a direction that the contact portion approaches to or departs from the contacted portion.