Rotary punching apparatus
First Claim
1. A rotary punching apparatus for punching elongate openings in a moving web workpiece the elongate openings having a predetermined length along the longitudinal axis of the web and comprising;
- two die assemblies located on opposite sides of the path of the web workpiece, and power means for rotating the assemblies;
a first die mounted on one said assembly of said assemblies, and movement means for moving said first die generally outwardly relative to said one assembly so as to punch a first die opening through said web;
a second die on said one assembly adjacent to said leading die, said second die being located to engage and punch the web whereby to punch a continuation of said first die opening in said web, thereby defining a continuous opening, and;
a third die cooperating with said first and said second dies, whereby to pierce said web and further define and expand said continuous opening.
2 Assignments
0 Petitions
Accused Products
Abstract
A rotary punching apparatus for punching openings in a moving web workpiece the openings having a predetermined length along the longitudinal axis of the web and having a pair of die assemblies located on opposite sides of the path of the web and a drive for rotating the assemblies, a leading die mounted on one assembly, and being moveable for generally radially so as to punch a die opening through the web, a mating die recess punched in the other of the assemblies; and, a trailing die adjacent to the leading die, being located to punch the web at a point adjacent the punched die opening so as to punch a second die opening in the web, the first die opening and the trailing die opening together defining a continuous opening having a predetermined length along the web. Also disclosed is a method of rotary punching by use of such apparatus.
46 Citations
21 Claims
-
1. A rotary punching apparatus for punching elongate openings in a moving web workpiece the elongate openings having a predetermined length along the longitudinal axis of the web and comprising;
-
two die assemblies located on opposite sides of the path of the web workpiece, and power means for rotating the assemblies;
a first die mounted on one said assembly of said assemblies, and movement means for moving said first die generally outwardly relative to said one assembly so as to punch a first die opening through said web;
a second die on said one assembly adjacent to said leading die, said second die being located to engage and punch the web whereby to punch a continuation of said first die opening in said web, thereby defining a continuous opening, and;
a third die cooperating with said first and said second dies, whereby to pierce said web and further define and expand said continuous opening. - View Dependent Claims (16, 17, 18)
-
-
2. A rotary punching apparatus for punching elongate openings in a moving web workpiece the elongate openings having a predetermined length along the longitudinal axis of the web and comprising;
-
two die assemblies located on opposite sides of the path of the web workpiece, and power means for rotating the assemblies;
at least a leading die mounted on one said assembly of said assemblies, and movement means for moving said leading die generally outwardly relative to said one assembly so as to punch a first die opening through said web;
a trailing die on said one assembly adjacent to said leading die, said trailing die being located to engage and punch the web whereby to punch a continuation of said first die opening in said web, thereby defining a continuous opening which is elongated along the axis of the web, having a predetermined length along said longitudinal axis of said web and;
a die recess in the other of said assemblies registering with said leading and trailing dies. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
- 19. The method of punching an elongate opening in a continuously moving web work piece and comprising the steps of passing said web work piece between a pair of rotary die assemblies, one of said die assemblies carrying a leading movable die, and a trailing movable die adjacent to one another, said leading and trailing movable dies being movable upon rotation of said one of said assembly, whereby to move sequentially outwardly from said assembly, and punch said web work piece, said leading die punching a leading edge of said elongate opening, and said trailing die cooperating with said leading die to continue said elongate opening, and said leading and trailing dies punching side edges of said elongate opening between said leading and trailing edges.
Specification