Abstract: A slit forming device according to an aspect includes a damper configured to pass through a plurality of stations arranged on a circumference, a slit forming blade disposed on an outer circumference side or an inner circumference side of a slit forming station among the plurality of stations, and a damper rotating part capable of rotating the damper about a vertical line such that a slit forming surface of a work faces the slit forming blade in the slit forming station.

Abstract: A work measurement device according to an aspect includes a posture holding surface for holding a posture of a work, a first work presser capable of pressing the work against the posture holding surface from an opposite side to the posture holding surface across the work, a contact disposed to be able to contact the work, a moving unit for moving, relative to the contact, the work pressed against the posture holding surface by the first work presser. The contact is configured to contact the work downstream of the first work presser in a relative movement direction of the work by the moving unit.

Abstract: A slit forming device according to an aspect includes a damper configured to pass through a plurality of stations arranged on a circumference, a slit forming blade disposed on an outer circumference side or an inner circumference side of a slit forming station among the plurality of stations, and a damper rotating part capable of rotating the damper about a vertical line such that a slit forming surface of a work faces the slit forming blade in the slit forming station.