Patent ID: 7775475

Claim:
A winding drum for a sheet-like member, comprising: a drum body having an outer peripheral surface around which the sheet-like member can be wound; a plurality of intake holes provided on the outer peripheral surface of the drum body at a predetermined position in the circumferential direction of the drum body, the intake holes being arranged in the axial direction of the drum body; a sucking means for sucking air through the intake holes so that the intake holes suck the sheet-like member when the sheet-like member is wound around the outer peripheral surface of the drum body; a hollow portion provided in the drum body so as to extend along the intake holes in the axial direction of the drum body, the hollow portion being communicated with each of the intake holes; a changeover member formed so as to extend along the hollow portion, the changeover member having an outer peripheral surface formed so as to extend along an inner peripheral surface of the hollow portion, the changeover member being rotatably provided in the hollow portion; an air passage provided on the changeover member, the air passage which communicates intake holes of a predetermined range in the axial direction of the drum body with the sucking means when the changeover member is placed at a predetermined position in a rotating direction of the changeover member, the air passage which communicates intake holes of another predetermined range in the axial direction of the drum body with the sucking means when the changeover member is placed at another predetermined position in the rotating direction of the changeover member; and a seal member provided between the outer peripheral surface of the changeover member and the inner peripheral surface of the hollow portion; wherein the seal member seals a gap between the outer peripheral surface of the changeover member and the inner peripheral surface of the hollow portion so as to inhibit suction of air through intake holes of a range other than said predetermined range when the changeover member is placed at said predetermined position in the rotating direction, and the gap between the outer peripheral surface of the changeover member and the inner peripheral surface of the hollow portion so as to inhibit suction of air through intake holes of a range other than said another predetermined range when the changeover member is placed at said another predetermined position in the rotating direction.