Machine for rolling bags of plastics

Claim 2

A machine for winding up rolls of piled sheet material, particularly of plastics bags, comprising: a table for at least partly supporting said piled sheet material; winding means including: a frame, a rotary body in said frame, pliers means rotatable with the rotary body for gripping and releasing piled sheet material and having a projecting first jaw member integral with said rotary body and a projecting second jaw member parallel with said first jaw member and shiftable towards and away from said first jaw member, guiding means for supporting said frame for forward and return strokes transversely of said piled sheet material, first motor means for controlling said shifting movement of said second jaw member, second motor means for controlling said forward and return strokes of said frame, and locking means for selectively locking said rotary body in a predetermined angular position.

Claim 3

A machine according to claim 1, wherein said frame has a box-like shape and arm means is mounted on said guiding means near the box-like frame in its extreme forward stroke position, said arm means being spring biased to embrace a portion of the said jaw members to disengage a roll of piled sheets from the pliers means during the return stroke of said frame.

Claim 4

A machine for winding up rolls of piled sheet material, particularly plastics bags, comprising: a table for supporting piled sheet material; two winding units facing each other, each one including: a frame, a rotary body in said frame, pliers means rotatable with the rotary body for gripping and releasing piled sheet material and having a projecting first jaw member integral with said rotary body and a projecting second jaw member parallel with said first jaw member and shiftable towards and away from said first jaw member, guiding means for supporting said frame forward and return strokes transversely of said piled sheet material, first motor means for controlling said shifting movement of said second jaw member, second motor means for controlling said forward and return strokes of said frame, and locking means for selectively locking said rotary body in a predetermined angular position; two parallel rails extending from positions spaced from both sides of said piled sheet material to discharge positions; movable carriage means supported on each of said two parallel rails, said two winding units being mounted on said carriage means; and motor means for moving said movable carriage means in unison along said rails.

Claim 5

A machine for winding up rolls of piled sheet material, particularly plastics bags, comprising: a table for supporting piled sheet material; two winding units facing each other, each one including: a frame, a rotary body in said frame, pliers means rotatable with the rotary body for gripping and releasing piled sheet material and having a projecting first jaw member integral with said rotary body and a projecting second jaw member parallel with said first jaw member and shiftable towards and away from said first jaw member, guiding means for supporting said frame forward and return strokes transversely of said piled sheet material, first motor means for controlling said shifting movement of said second jaw member, second motor means for controlling said forward and return strokes of said frame, and locking means for selectively locking said rotary body in a predetermined angular position; two parallel rails extending from positions spaced from both sides of said piled sheet material to discharge positions; movable carriage means supported on each of said two parallel rails, said two winding units being mounted on said carriage means; and motor means for moving said movable carriage means in unison along said rails.

Claim 6

A machine according to claim 3, wherein said frame has a box-like shape and arm means are mounted on each said transverse guiding means near each box-like frame in its extreme forward stroke position, said arm means being spring biased to embrace a portion of the said jaw members to disengage a roll of piled sheets from the respective pliers means during the return stroke of said frame.

Claim 7

A machine according to claim 3, further comprising means for coordinating the movement of the two rotary bodies with the movement of said frames.

Claim 8

A machine for winding up rolls of piled sheet material, particularly plastics bags, comprising: a table for supporting piled sheet material; two winding units facing each other, each one including a frame, a rotary body in said frame, pliers means rotatable with the rotary body for gripping and releasing piled sheet material and having a projecting first jaw member integral with said rotary body and a projecting second jaw member parallel with said first jaw member and shiftable towards and away from said first jaw member, guiding means for supporting said frame for forward and return strokes transversely of said piled sheet material, first motor means for controlling said shifting movement of said second jaw member, second motor means for controlling said forward and return strokes of said frame, and locking means for selectively locking said rotary body in a predetermined angular position; two parallel rails extending from positions spaced from both sides of said piled sheet material to discharge positions; movable carriage means supported on each of said two parallel rails, said two winding units being mounted on said carriage means; motor means for moving said movable carriage means in unison along said rails; and a taping means for holding adhesive tape for tying a roll of piled sheet material.

Claim 9

A machine for winding up rolls of piled sheet material, particularly plastics bags, comprising: a table for supporting piled sheet material; two winding units facing each other, each one including a frame, a rotary body in said frame, pliers means rotatable with the rotary body for gripping and releasing piled sheet material and having a projecting first jaw member integral with said rotary body and a projecting second jaw member parallel with said first jaw member and shiftable towards and away from said first jaw member, guiding means for supporting said frame for forward and return strokes transversely of said piled sheet material, first motor means for controlling said shifting movement of said second jaw member, second motor means for controlling said forward and return strokes of said frame, and locking means for selectively locking said rotary body in a predetermined angular position; two parallel rails extending from positions spaced from both sides of said piled sheet material to discharge positions; movable carriage means supported on each of said two parallel rails, said two winding units being mounted on said carriage means; motor means for moving said movable carriage means in unison along said rails; and a taping means for holding adhesive tape for tying a roll of piled sheet material.

Claim 10

A machine according to claim 6, wherein said taping means comprises: a cylinder adapted to carry a roll of adhesive tape; a first lever means movable between a position in which tape is to be applied to a position in which tape is to be cut; tongue means carried by one end of said first lever means adapted to press an end portion of adhesive tape against a roll of piled sheet material and a cutting device carried by said one end of said first lever means for cutting said end portion of tape.

Claim 11

A machine according to claim 6, wherein rotation of said rotary body and associated roll of sheet material causes concurrently dragging of tape from said taping means, the tape being automatically applied about the sheet material roll.

Claim 12

A machine according to claim 6, further comprising flexible and rocking tabs mounted slightly upstream of the taping means and staggered with regard to said taping means, said tabs extending outwardly and being adapted to come into contact with a roll of sheet material to maintain the rolled disposition of said sheets.

Claim 13

A machine according to claim 7, wherein said cutting device for adhesive tape comprises a blade, said tongue means comprises a flexible tongue, and said taping means includes a second lever supported by said first lever means, said second lever being actuatable to move the blade to cut tape and to move the flexible tongue to apply the portion cut away from the roll of adhesive tape to the roll of sheet material.