Sheet suction device, conveyor, printer, and suction region changing device

A suction region changing device between a plurality of suction holes and a suction device, the suction region changing device comprising:

• a first member between the plurality of suction holes and the suction device, the first member configured to rotate and change a suction region of the suction device connected to the plurality of suction holes to suck a sheet;
• a second member including a plurality of holes on a side surface in a circumferential direction of the second member;
• and
• a detector to detect a rotation angle of the first member,
• wherein the first member includes grooves connected to the suction device, the grooves on a side surface in a circumferential direction of the first member, and
• a rotation of the first member in one direction relative to the second member increases a number of the plurality of holes of the second member connected to the grooves of the first member and increases a number of the plurality of suction holes connected to the suction device.