Transport device and recording device

1. A transport device comprising:

a transport mechanism comprising a supporting member configured to support a placed medium and transport the medium along a transport path along with movement of the supporting member;

a first charging device configured to alternately charge the supporting member with one polarity and an opposite polarity along the transport path to form a plurality of charged segments in the supporting member;

a transfer mechanism configured to transfer the medium to the supporting member to place the medium on the supporting member;

a second charging device configured to alternately charge the medium with one polarity and an opposite polarity along the transfer path for transferring the medium with the transfer mechanism before the transfer mechanism places the medium on the supporting member to form a plurality of charged segments in the medium; and

a control unit configured to control at least one of the transport mechanism, the transfer mechanism, the first charging device, and the second charging device such that a charging pattern of the placed medium and a charging pattern of the supporting member have a predetermined relationship on the supporting member.

2. The transport device according to claim 1 , wherein the control unit is configured to control at least one of the transport mechanism, the transfer mechanism, the first charging device, and the second charging device such that a match rate indicating a rate of the charged segment having a second polarity, formed in the medium with the second charging device and overlapped with the supporting member to the charged segment having a first polarity formed on the supporting member with the first charging device, matches a match rate of all of the charged segments formed in the supporting member.

3. The transport device according to claim 2 , wherein the plurality of charged segments formed in the supporting member have the same length along the transport path, and the plurality of charged segments formed in the medium have the same length along the transport path, and

one charged segment of the supporting member and one charged segment in the medium have the same length along the transport path.

4. The transport device according to claim 3 , wherein the control unit is configured to control at least one of the transport mechanism, the transfer mechanism, the first charging device, and the second charging device such that a charged segment of a first polarity formed in the medium opposes any charged segment of a second polarity formed in the supporting member, on the supporting member.

5. The transport device according to claim 1 , further comprising a neutralization device configured to neutralize the supporting member.

6. The transport device according to claim 5 , wherein the neutralization device is configured to apply charges having an opposite polarity to a polarity of each of the charged segments formed in the supporting member to the charged segment to neutralize the supporting member.

7. The transport device according to claim 1 , further comprising an operation sensor configured to detect an operation of the supporting member,

wherein the control unit is configured to control at least one of the first charging device and the second charging device based on a detection result of the operation sensor such that a charging pattern of the medium and a charging pattern of the supporting member have the predetermined relationship on the supporting member.

8. The transport device according to claim 1 , further comprising an operation sensor configured to detect an operation of the supporting member,

wherein the control unit is configured to control at least one of the transport mechanism and the transfer mechanism based on a detection result of the operation sensor to place the medium on a predetermined region of the supporting member, and control the first charging device and the second charging device such that the first charging device operates only in a period for charging the predetermined region of the supporting member is charged, and the second charging device operates only in a period for charging the medium.

9. The transport device according to claim 1 , wherein the control unit is configured to control at least one of the transport mechanism, the transfer mechanism, the first charging device, and the second charging device such that a match rate indicating a rate of the charged segment having a second polarity formed in the medium and overlapped with the supporting member to the charged segment having a first polarity formed on the supporting member is variable.

10. The transport device according to claims 1 , further comprising a humidity sensor,

wherein the control unit is configured to control at least one of the first charging device and the second charging device such that at least one of a charging voltage of the first charging device and a charging voltage of the second charging device becomes higher as a value of humidity detected by the humidity sensor increases.

11. The transport device according to claim 1 , further comprising a thickness specifying unit configured to specify a thickness of the sheet-like medium,

wherein the control unit is configured to control at least one of the first charging device and the second charging device such that at least one of a charging voltage of the first charging device and a charging voltage of the second charging device becomes higher as a thickness of the medium specified by the thickness specifying unit increases.

12. The transport device according to claim 1 , wherein a charged amount of one charged segment of the medium, which is charged with the second charging device is smaller than a charged amount of one charged segment of the supporting member, which is charged with the first charging device.

13. The transport device according to claim 1 , wherein the supporting member is an endless belt, and

the transport mechanism further comprises a plurality of rollers between which the belt is stretched.

14. A recording device comprising:

the transport device according to claim 1 ; and

a liquid ejection head configured to eject a liquid to the recording medium supported by the supporting member.

15. The recording device according to claim 14 , further comprising a neutralization device configured to neutralize the supporting member,

wherein the neutralization device comprises a neutralization member positioned between the liquid ejection head and a separation position at which the recording medium is taken off from the supporting member so as to come into contact with the recording medium.

16. The recording device according to claim 15 , wherein the neutralization member is configured to contact with an opposite surface of the recording medium to a surface supported by the supporting member.

17. The recording device according to claim 14 , wherein the second charging device configured to charge an opposite surface of the medium to a surface in contact with the supporting member.

18. The recording device according to claim 14 , wherein the second charging device configured to charge a surface of the medium in contact with the supporting member.

19. The recording device according to claim 14 , further comprising a retransport path configured to retransport the recording medium transported with the transport mechanism such that an opposite surface comes into contact with the liquid ejection head,

wherein the liquid ejection head first records an image on a first surface on the liquid ejection head side of the recording medium transported with the transport mechanism, and then a second surface of the recording medium transported with the transport mechanism through the retransport path.

20. The recording device according to claim 19 , wherein the control unit is configured to control at least one of the first charging device and the second charging device to satisfy at least one of (a) a condition that a charging voltage of the first charging device applied upon recording an image on the second surface is higher than a charging voltage of the first charging device applied upon recording an image on the first surface and (b) a condition that a charging voltage of the second charging device applied upon recording an image on the second surface is higher than a charging voltage of the second charging device upon recording an image on the first surface.