Printing apparatus and conveyance control method

A conveyance control method of conveying a medium with a conveyance unit,

• the conveyance unit including:
• a feeding unit configured to feed the medium from a roll wound with the medium in a rolled form,
• a conveyance roller pair configured to convey the medium fed by the feeding unit, and
• an intermediate roller pair configured to convey, toward the conveyance roller pair, the medium fed by the feeding unit at a position between the feeding unit and the conveyance roller pair,
• the conveyance roller pair including:
• a first driving roller and
• a first driven roller configured to sandwich the medium together with the first driving roller,
• the intermediate roller pair including:
• a second driving roller and
• a second driven roller configured to sandwich the medium together with the second driving roller,
• the conveyance unit including:
• a first driving unit configured to rotate the first driving roller and
• a load changing unit configured to change a pressing load acting between the second driving roller and the second driven roller by relative translational movement of the rotation shaft of the second driven roller with respect to the rotation shaft of the second driving roller, the method comprising:
• controlling the first driving unit such that the first driving roller is rotated and stopped in an alternate manner in an intermittent conveyance of conveying and stopping the medium in an alternate manner;
• executing a first control configured to control the load changing unit by changing a distance between a rotation shaft of the second driven roller and a rotation shaft of the second driving roller such that the pressing load is a first pressing load when the first driving roller is rotated in the intermittent conveyance;
• and
• executing a second control configured to control the load changing unit by changing the distance between a rotation shaft of the second driven roller and a rotation shaft of the second driving roller such that the pressing load is not generated or such that the pressing load is a second pressing load smaller than the first pressing load when rotation of the first driving roller is stopped in the intermittent conveyance.

A printing apparatus comprising:

• a printing unit configured to perform printing on a medium;
• a conveyance unit configured to convey the medium to the printing unit;
• and
• a control unit configured to control the conveyance unit, wherein
• the conveyance unit includes:
• a feeding unit configured to feed the medium from a roll wound with the medium in a rolled form,
• a conveyance roller pair configured to convey, toward the printing unit, the medium fed by the feeding unit, and
• an intermediate roller pair configured to convey, toward the conveyance roller pair, the medium fed by the feeding unit at a position between the feeding unit and the conveyance roller pair,
• the conveyance roller pair includes:
• a first driving roller and
• a first driven roller configured to sandwich the medium together with the first driving roller,
• the intermediate roller pair includes:
• a second driving roller and
• a second driven roller configured to sandwich the medium together with the second driving roller,
• the conveyance unit includes:
• a first driving unit configured to rotate the first driving roller,
• a second driving unit configured to rotate the second driving roller and
• a load changing unit configured to change a pressing load acting between the second driving roller and the second driven roller, and
• the control unit is configured to:
• control the first driving unit such that the first driving roller is rotated and stopped in an alternate manner in an intermittent conveyance of conveying and stopping the medium in an alternate manner,
• control the second driving unit such that the second driving roller is rotated and stopped,
• execute a first control configured to control the load changing unit such that the pressing load is a first pressing load when the first driving roller is rotated in the intermittent conveyance,
• execute a second control configured to control the load changing unit such that the pressing load is not generated or such that the pressing load is a second pressing load smaller than the first pressing load when rotation of the first driving roller is stopped in the intermittent conveyance,
• and
• control the load changing unit such that the pressing load is the first pressing load when the first driving roller is stopped and the second driving roller is rotated.