A system for forming and fanfolding a sheet material, from a web of indefinite length, having a bottom, top and longitudinal side edges, the system includes a frame, a feeding device, a creasing device downstream of the feeding device to form transverse creases on the web spaced apart at a constant longitudinal pitch and defining adjacent partitions, and a folding device located downstream of the creasing device for folding adjacent partitions along creases into a fanfold arrangement. The folding device includes at least one first group of thrust tools acting on creases formed on the bottom side of the web and at least one second group of thrust tools acting on creases formed on the top side of the web. The thrust tools of each group are mechanically connected to and operatively dependent on each other so that tools of the same group are forced to follow the same trajectory.

A system for forming and fanfolding a sheet material, from a web of indefinite length, having a bottom, top and longitudinal side edges, the system includes a frame, a feeding device, a creasing device downstream of the feeding device to form transverse creases on the web spaced apart at a constant longitudinal pitch and defining adjacent partitions, and a folding device located downstream of the creasing device for folding adjacent partitions along creases into a fanfold arrangement. The folding device includes at least one first group of thrust tools acting on creases formed on the bottom side of the web and at least one second group of thrust tools acting on creases formed on the top side of the web. The thrust tools of each group are mechanically connected to and operatively dependent on each other so that tools of the same group are forced to follow the same trajectory.

A stacking apparatus for alternately stacking a continuous ribbon-like separator and foil sheets. The apparatus comprises a stacking station to receive foil sheets, first and second transfer devices, a feeder device and a displacement device fed by the feeder device. The first and second transfer devices are movable between a pickup and release position for respective transfer of first and second foil sheets. The ribbon-like separator being fed by the feeder device. The displacement device comprises an accompanying device movable above the stacking station between first and second end positions when the second transfer device moves to the pick-up position, and between the second and first end positions when the first transfer device moves to the pick-up position. The accompanying device comprises at least one surface to contact the ribbon-like separator. Motorized members rotate the surface of the accompanying device while it moves between the first and second end positions.

A stacking apparatus for alternately stacking a continuous ribbon-like separator and foil sheets. The apparatus comprises a stacking station to receive foil sheets, first and second transfer devices, a feeder device and a displacement device fed by the feeder device. The first and second transfer devices are movable between a pickup and release position for respective transfer of first and second foil sheets. The ribbon-like separator being fed by the feeder device. The displacement device comprises an accompanying device movable above the stacking station between first and second end positions when the second transfer device moves to the pick-up position, and between the second and first end positions when the first transfer device moves to the pick-up position. The accompanying device comprises at least one surface to contact the ribbon-like separator. Motorized members rotate the surface of the accompanying device while it moves between the first and second end positions.

An object of the present disclosure is to prevent wrinkles in a folding line portion of a paper irrespective of the conditions such as the type, the size, and the like of the paper, thereby securing the precision of the position of a folding line when a flap (such as a flap portion) of an envelope is folded back. The folding unit comprises a pair of an upper and a lower guide plates that defines part of the paper conveyance path at the folding position, and the folding plate is configured so that, when turning from the placement position to the overlap position, a lower face of the folding plate overlaps an upper face of the upper guide plate of the pair of the upper and the lower guide plates.

An object of the present disclosure is to prevent wrinkles in a folding line portion of a paper irrespective of the conditions such as the type, the size, and the like of the paper, thereby securing the precision of the position of a folding line when a flap (such as a flap portion) of an envelope is folded back. The folding unit comprises a pair of an upper and a lower guide plates that defines part of the paper conveyance path at the folding position, and the folding plate is configured so that, when turning from the placement position to the overlap position, a lower face of the folding plate overlaps an upper face of the upper guide plate of the pair of the upper and the lower guide plates.