Stick curvature correction device

A method for correcting a curvature of a stick used for suspending food, the method comprising:

• detecting a curvature of the stick having a curved section by using a curvature detection unit which includes two-end push-up portions and a multi-point sensor unit disposed between the two-end push-up portions, the multi-point sensor unit including a plurality of sensors arranged in a longitudinal direction;
• pushing up a part located between one end and a center of the stick by a center push-up unit movable in a vertical direction, when the curvature detection unit detects the curvature equal to or more than a predetermined threshold value;
• holding the stick by a stick holding unit;
• and
• correcting the curvature of the stick by a stick correction unit including a correction roller,
• wherein the detecting a curvature of the stick includes one of the two-end push-up portions pushing up the one end of the stick and an other of the two-end push-up portions pushing up an other end opposite to the one end of the stick so that the curved section of the stick is located in a downward position by rotating the stick axially, and detecting plural points of the stick by the multi-point sensor unit in accordance with an arrangement position of the plurality of sensors when the two-end push-up portions pushes up the ends of the stick,
• in the pushing up the part, by rotating the stick axially after lowering the one end of the stick by the two-end push-up portions, the curved section of the stick is positioned from the downward position to an upward position and the other end is positioned in a lower position than that of the one end,
• in the holding the stick, the stick holding unit holds the other end of the stick located in the lower position in a slidable but unrotatable manner in the longitudinal direction, while maintaining the upward position of the curved section of the stick, and
• in the correcting the curvature of the stick, the correction roller applies a force to the curved section in a direction opposite to a curve direction of the stick which is supplied from the stick holding unit so as to correct the curvature of the stick.