Machine for folding a continuous web assembly

• US 3,980,291 A
• Filed: 04/01/1975
• Issued: 09/14/1976
• Est. Priority Date: 02/23/1971
• Status: Expired due to Term

• Current Assignee: AM International Incorporated (Paragon Corporate Holdings, Inc.)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Loase, Raymond M.
• Primary Examiner(s): Burr, Edgar S.
• Assistant Examiner(s): Heinz, A.
• Application Number:
  US05/564,119
• Time in Patent Office: 532 Days
• Field of Search: 270/6, 270/7, 270/13, 270/14, 270/19, 270/38, 270/39, 270/42, 270/47-50, 270/60, 270/63-65, 270/70-77
• US Class Current: 493/430
• CPC Class Codes: B65H 45/20 Zig-zag folders B65H45/228 takes precedence

Abstract

A continuous web folder includes a pair of driven cylinders arranged in adjacent parallel relation, and each cylinder has a pair of diametrically opposed movable jaw members disposed at right angles to a pair of diametrically opposed pivotal tucker blades. The surface of each cylinder includes axially spaced circumferentially extending wide grooves which form relatively narrow circumferentially extending ribs therebetween for effectively eliminating the effect of static electric attraction between the cylinders and a paper web directed between the cylinders and thereby provides for high speed zig-zag folding of the web.

Claims

1. In a high speed cylinder type folder for folding a continuous web in zig-zag fashion, said folder including a pair of driven cylinders mounted with their axes of rotation in parallel adjacent relation and each having an outer cylindrical wall defining a nip adapted to receive the web therebetween, grippers and tucker blades mounted in diametrically opposed positions in said walls lengthwise of each said cylinder, the gripper on one cylinder being arranged in opposed cooperating relation with the blade on the other cylinder whereby said blades tuck the web into said grippers on alternate ones of said cylinders at longitudinally spaced intervals along the web in response to rotation of said cylinders, said grippers being controlled such that lengths of said web are pulled away from said nip and held by said grippers in contact with portions of the associated said outer cylindrical walls of first one and then the other of said cylinders before release of said grippers, and stripping members operative to guide the folded web from said cylinders upon release of said grippers;

the improvement comprising said portions of said outer walls having formed therein a series of spaced apart relatively wide and shallow recesses opening outwardly in a circumferential direction around each said cylinder and having bottoms slightly depressed with respect to said outer cylindrical walls, said recesses being separated by relatively narrow ribs having outer surfaces which are adapted to contact the web and having sides integral with the bottoms of said recesses the width of said recesses being substantially greater than the width of said ribs, said grippers and tucker blades extending lengthwise of said cylinders across said recesses and ribs to form end walls of said recesses extending outward to the level of said outer cylindrical walls and thereby to trap air in said recesses behind said lengths of said web whereby upon release of said grippers the lengths of web will be urged away from said cylinders by the trapped air.