Bag manufacturing apparatus
AssigneesNewlong Machine Works, Ltd., New Pack Company, Ltd.
InventorsToyokichi Gotou, Masami Fujishiro
Life of this patent
Estimating the term…
Abstract
A lapel provided at the one end of a paper sheet to forming a paper bag is introduced into the interior of an opening on the rotary cylinder by means. The folding blade has a rotational axis located outside the rotary cylinder parallel to an axis of rotation of the rotary cylinder. The thus bent lapel is brought in pressure contact with the edge face of the opening by means of a holding pawl which turns in operative association with the rotary cylinder. Thereafter, the lapel is covered and depressed by means of a depressing pawl which turns in operative association with the rotary cylinder whereby the lapel and a part of the paper sheet are adhesively secured to one another to build a double-walled structure around the opening of the paper bag.
Claims9
A folding apparatus for folding an edge part on a paper sheet to form a lapel of double thickness on an open end of a bag made from said sheet comprising:
- a rotary cylinder having an opening formed thereon extending in both circumferential and axial directions of the cylinder, said paper sheet disposed on said cylinder with said edge part overlying said opening,
- a folding blade rotatable about an axis located outside said rotary cylinder and generally parallel with an axis of rotation of the rotary cylinder, and means for moving part of said folding blade into said opening on the rotary cylinder so that said folding blade contacts to direct said edge part into said opening,
- a holding pawl movable towards and away from an edge face of the opening for engagement with a folded portion of said edge part, and means for moving said holding pawl in operative association with the rotary cylinder towards the edge face to exert pressure contact against said folded portion of said edge part bearing against the edge face, and
- a depressing pawl positioned to project through the opening to cover a part of the outer circumferential surface of the rotary cylinder adjacent the edge face of the opening located opposite to the holding pawl to exert pressure contact against a free end of the edge part projecting out of the opening from the folded portion, and means for moving said depressing pawl in operative association with the rotary cylinder to exert said pressure contact.
A folding apparatus for folding an edge part on a paper sheet to form as lapel of double thickness on an open end of a bag made from said sheet, comprising:
- a rotary cylinder having an opening formed thereon in both circumferential and axial directions of the cylinder, said paper sheet disposed on said cylinder with said edge part overlying said opening;
- a folding blade rotatable about an axis located outside said rotary cylinder and generally parallel with an axis of rotation of the rotary cylinder, said folding blade being formed with a plurality of cutouts;
- and
- means for moving said folding blade into the interior of said opening to direct said edge part into said opening;
- a holding pawl movable towards and away from an edge face of the opening for engagement with a folded portion of said edge part, and means for moving said holding pawl in operative association with the rotary cylinder towards the edge face to exert pressure contact against said folded portion of said edge part bearing against the edge face;
- and
- a depression pawl positioned to project through the opening to cover a part of the outer circumferential surface of the rotary cylinder adjacent the edge face of the opening to exert pressure contact against a free end of the edge part projecting out of the opening from the folded portion, and means for moving said depressing pawl in operative association with the rotary cylinder to exert said pressure contact.
Dependencies are inferred from the claim text.