Drawing device and control method for the same

A method for positioning a finger or toe including a nail by a positioning device included in a drawing device and for performing drawing on the nail by the drawing device, the positioning device comprising

• an insertion portion into which a finger or a toe including a nail which is a drawing target surface is inserted, the insertion portion comprising a left side wall, a right side wall, a lower wall, an upper wall, and an inner wall joining the left side wall, the right side wall, and the upper and lower side walls, the upper wall having an opening configured to expose an entire tip portion of the finger or the toe including a region having the nail of the finger or the toe, and
• a holding portion disposed in the insertion portion and configured to suppress movement of the finger or the toe, the holding portion comprising
• a first pressing portion disposed on the left side wall near the inner wall and configured to press a first side surface on a first side of the tip portion of the finger or toe that is inserted in the insertion portion,
• a second pressing portion disposed on the right side wall near the inner wall and configured to press a second side surface on a second side of the tip portion of the finger or toe that is inserted in the insertion portion, and
• a third pressing portion disposed at on the lower wall and configured to press a lower surface of the finger or toe that is inserted in the insertion portion,
• each of the first and second pressing portions being disposed at a position such that a distance in a height direction between a center thereof and the opening is shorter than a distance in the height direction between a center of the insertion portion and the opening,
• the third pressing portion extending along a proximal portion of the insertion portion, opposite the inner wall, such that a distal end of the third pressing portion is aligned with a proximal portion of the opening, and
• the method comprising:
• suppressing movement of the finger or the toe by pressing both side surfaces and the lower surface of the finger or the toe that is inserted into the insertion portion by supplying fluid to the first, second, and third pressing portions, to thereby inflate the first, second, and third pressing portions, whereby the tip portion of the finger or the toe, which is pressed upward by the third pressing portion and obliquely downward by the first and second pressing portions, is prevented from passing upward out through the opening;
• performing drawing on the nail of the finger or the toe the movement of which is suppressed;
• and
• releasing the suppression by releasing the pressing by discharging the fluid from the first, second, and third pressing portions after performing the drawing, whereby the first and second pressing portions are shrunk.