An unwinder (1) of rolls (B1, B2) including a bearing structure (3) and two pairs of arms (11A, 11B; 13A, 13B) supported movable on the bearing structure (3). The unwinder further includes a splicing machine (31). The bearing structure (3) includes a base (5) and an upright (7) extending from the base, on which a cross member (33) is supported. The cross member (33) includes an intermediate portion (33A) rigidly bound to the upright (7) and a pair of lateral supports (33B, 33C) adapted to assume at least one operating position and one non-operating position, with respect to the inter-mediate portion (33A) of the cross member (33).

A sheet conveyer, including a body with a conveyer path, a first roller, a second roller, a roller holder supporting the second roller rotatably, an urging member urging the roller holder, and a guide member, is provided. The guide member is supported rotatably by the body at a position on a side opposite to the first roller across the second roller is pivotable between a closed position and an open position. The roller holder is movable between a first position, where the second roller contacts the first roller, and a second position, where the second roller is separated from the first roller and in which the roller holder contacts the guide member located at the open position. The roller holder located at the second position is restricted by the guide member from moving farther from the first position. The urging member urges the roller holder toward the first position.

An unwinder (1) of rolls (B1, B2) including a bearing structure (3) and two pairs of arms (11A, 11B; 13A, 13B) supported movable on the bearing structure (3). The unwinder further includes a splicing machine (31). The bearing structure (3) includes a base (5) and an upright (7) extending from the base, on which a cross member (33) is supported. The cross member (33) includes an intermediate portion (33A) rigidly bound to the upright (7) and a pair of lateral supports (33B, 33C) adapted to assume at least one operating position and one non-operating position, with respect to the inter-mediate portion (33A) of the cross member (33).

A sheet conveyer, including a body with a conveyer path, a first roller, a second roller, a roller holder supporting the second roller rotatably, an urging member urging the roller holder, and a guide member, is provided. The guide member is supported rotatably by the body at a position on a side opposite to the first roller across the second roller is pivotable between a closed position and an open position. The roller holder is movable between a first position, where the second roller contacts the first roller, and a second position, where the second roller is separated from the first roller and in which the roller holder contacts the guide member located at the open position. The roller holder located at the second position is restricted by the guide member from moving farther from the first position. The urging member urges the roller holder toward the first position.