Regulation device and printer

A printer, comprising

• a print head;
• and
• a regulation device that regulates movement in a width direction of a rolled sheet of the printer, comprising:
• a first rack gear connected to a first guide support supporting the rolled sheet so that movement to one side of the width direction is regulated, the first rack gear movable in the width direction;
• a second rack gear connected to a second guide support supporting the rolled sheet so that movement to a second side of the width direction is regulated, the second rack gear movable in the width direction;
• a pinion gear engaging with the first and second rack gears;
• and
• a regulation gear that engages with the pinion gear to rotate, the regulation gear includes a locked portion having a plurality of steps are formed along a curved line forming a part of a spiral wound in a rotation direction of the regulation gear if the first and second rack gears are moved outward in the width direction from a rotation shaft center of the regulation gear toward a diameter outside, the regulation gear regulates movement of the first and second rack gears by locking the locked portion.

A point of sale printer, comprising

• a thermal print head;
• and
• a regulation device that regulates movement in a width direction of a rolled sheet of the point of sale printer, comprising:
• a first rack gear connected to a first guide support supporting the rolled sheet so that movement to one side of the width direction is regulated, the first rack gear movable in the width direction;
• a second rack gear connected to a second guide support supporting the rolled sheet so that movement to a second side of the width direction is regulated, the second rack gear movable in the width direction;
• a pinion gear engaging with the first and second rack gears;
• and
• a regulation gear that engages with the pinion gear to rotate, the regulation gear includes a locked portion having a plurality of steps are formed along a curved line forming a part of a spiral wound in a rotation direction of the regulation gear if the first and second rack gears are moved outward in the width direction from a rotation shaft center of the regulation gear toward a diameter outside, the regulation gear regulates movement of the first and second rack gears by locking the locked portion.