Liquid ejection apparatus, winding control method, and computer readable recording medium

1. A liquid ejection apparatus comprising:

a conveying unit configured to intermittently convey a printing medium by a predetermined feed amount;

a winding unit configured to wind the printing medium conveyed by the conveying unit;

a printing unit configured to perform printing on the conveyed printing medium; and

a rotation control unit configured to control the winding unit to rotate in a winding direction at a predetermined timing after the conveying unit has started to convey the printing medium intermittently, and then cause the winding unit to rotate in a reverse direction opposite to the winding direction,

wherein the rotation control unit is configured to control the winding unit to rotate in the winding direction and the reverse direction every time the conveying unit conveys the printing medium intermittently.

2. The liquid ejection apparatus according to claim 1 , wherein the rotation control unit is configured to start to control the winding unit to rotate in the winding direction at a predetermined timing after the conveying unit has started to convey the printing medium intermittently and before conveyance is completed intermittently.

3. The liquid ejection apparatus according to claim 1 , further comprising:

a torque limiter drivingly connected to the winding unit, wherein

the rotation control unit is configured to control rotation of the winding unit such that the torque limiter slides and gives tension to the printing medium after the conveying unit completes conveyance of the printing medium intermittently.

4. The liquid ejection apparatus according to claim 1 , wherein the rotation control unit is configured to control the winding unit to rotate in the winding direction such that looseness of the printing medium reaches a predetermined level or lower at a timing after the conveying unit has started to convey the printing medium intermittently, and then control the winding unit to rotate in the reverse direction opposite to the winding direction such that a predetermined amount of looseness is given to the printing medium.

5. The liquid ejection apparatus according to claim 4 , wherein the rotation control unit is configured to determine that the looseness of the printing medium reaches the predetermined level or lower when a control voltage for controlling rotation of the winding unit is a certain control voltage that is higher than a normal voltage for a predetermined time or longer.

6. The liquid ejection apparatus according to claim 4 , wherein the rotation control unit is configured to determine that the looseness of the printing medium reaches the predetermined level or lower when a number of rotation pulses that are obtained by controlling rotation of the winding unit is a predetermined number of rotation pulses for a predetermined time or longer.

7. The liquid ejection apparatus according to claim 4 , wherein the rotation control unit is configured to determine a rotation amount of the winding unit for giving a predetermined looseness amount to the printing medium, based on an outer diameter of the printing medium that has been wound by the winding unit, the outer diameter being calculated from a conveying amount of the printing medium by the conveying unit and a rotation amount of the winding unit, and control the winding unit to rotate in the reverse direction by the determined rotation amount.

8. The liquid ejection apparatus according to claim 4 , wherein the rotation control unit is configured to determine a rotation amount of the winding unit for giving a predetermined looseness amount to the printing medium, based on an outer diameter of the printing medium that has been wound by the winding unit, the outer diameter being calculated from a conveying amount of the printing medium by the conveying unit and a rotation amount of the winding unit, and controls rotation of the winding unit such that a number of rotation pulses that are obtained by controlling the winding unit to rotate in the reverse direction reaches a certain number of rotation pulses corresponding to the determined rotation amount.

9. The liquid ejection apparatus according to claim 7 , wherein the rotation control unit is configured to perform, as initial operation that is performed prior to initiation of printing, looseness control of giving a predetermined amount of looseness to the printing medium by controlling the winding unit to rotate in the reverse direction after the outer diameter of the printing medium wound by the winding unit is detected and the printing medium is wound until the looseness reaches a predetermined level or lower.

10. The liquid ejection apparatus according to claim 8 , wherein the rotation control unit is configured to perform, as initial operation that is performed prior to initiation of printing, looseness control of giving a predetermined amount of looseness to the printing medium by controlling the winding unit to rotate in the reverse direction after the outer diameter of the printing medium wound by the winding unit is detected and the printing medium is wound until the looseness reaches a predetermined level or lower.

11. The liquid ejection apparatus according to claim 4 , wherein the rotation control unit controls a rotation speed of the winding unit such that a predetermined looseness amount of the printing medium is maintained, in accordance with an outer diameter of the printing medium wound by the winding unit.

12. The liquid ejection apparatus according to claim 4 , wherein the printing unit is configured to perform printing on the printing medium that has been wound by the winding unit such that the looseness reaches a predetermined level or lower and then been given a predetermined looseness amount by being rotated in the reverse direction.

13. A winding control method implemented by a liquid ejection apparatus

the liquid ejection apparatus including:

a conveying unit configured to intermittently convey a printing medium by a predetermined feed amount;

a winding unit configured to wind the printing medium conveyed by the conveying unit; and

a printing unit configured to perform printing on the conveyed printing medium,

the winding control method comprising:

controlling, by a rotation control unit, the winding unit to rotate in a winding direction at a predetermined timing after the conveying unit has started to convey the printing medium intermittently; and

controlling, by the rotation control unit, the winding unit to rotate in a reverse direction opposite to the winding direction after the winding unit has been controlled to rotate in the winding direction,

wherein the controlling by the rotation control unit to rotate the winding unit in the winding direction and the reverse direction occurs every time the conveying unit conveys the printing medium intermittently.

14. A liquid ejection apparatus comprising:

a conveying unit configured to intermittently convey a printing medium by a predetermined feed amount;

a winding unit configured to wind the printing medium conveyed by the conveying unit;

a printing unit configured to perform printing on the conveyed printing medium; and

a rotation control unit configured to control the winding unit to rotate in a winding direction at a predetermined timing after the conveying unit has started to convey the printing medium intermittently, and then cause the winding unit to rotate in a reverse direction opposite to the winding direction,

wherein the rotation control unit is configured to control the winding unit to rotate in the winding direction such that looseness of the printing medium reaches a predetermined level or lower at a timing after the conveying unit has started to convey the printing medium intermittently, and then control the winding unit to rotate in the reverse direction opposite to the winding direction such that a predetermined amount of looseness is given to the printing medium.