Hole punch for a cutting die

• US 4,306,476 A
• Filed: 01/09/1980
• Issued: 12/22/1981
• Est. Priority Date: 01/09/1980
• Status: Expired due to Term

• Current Assignee: Wachovia Bank NA (Wells Fargo & Company)
• Original Assignee: Container Graphics Corporation
• Inventors: Simpson, Jack R., Saunders, Philip G.
• Primary Examiner(s): Meister, J. M.
• Application Number:
  US06/110,781
• Time in Patent Office: 713 Days
• Field of Search: 83/117, 83/138, 83/139, 83/116, 83/128, 83/123, 83/653, 76/107 C, 493/82, 493/83, 493/342, 493/373, 493/472
• US Class Current: 83/117
• CPC Class Codes: B26D 7/1818 by pushing out
• CPC Class Codes: Y10T 83/2109 Resiliently mounted
• CPC Class Codes: Y10T 83/2133 By resiliently biased ejector
• CPC Class Codes: Y10T 83/2157 Elastomeric stripper contacting product

Abstract

A punch for a cutting die is provided for forming holes in corrugated board or the like. The hole punch includes a tubular metal member of circular transverse cross section having one end substantially flush with the back surface of a die plate in which it is mounted and the other end extending beyond the front surface of the die plate and terminating in a circular cutting edge. A body of resilient material, such as natural gum rubber or latex, is located within the cylindrical member and has one end terminating near the back end of the tubular member and another end terminating near the cutting edge of the tubular member. The purpose of the body is to eject and strip the scrap of corrugated board from the punch and from the rest of the blank being formed by the cutting die. The resilient body has a central, cylindrical passage extending completely therethrough, in a preferred form. This central passage enables the resilient material to be deformed inwardly when engaging a corrugated board being cut by the circular cutting edge, which provides a much longer life for the body of resilient material.

Claims

1. A cutting die for forming a hole in corrugated board or the like, said cutting die including a die plate having a front surface and a back surface, an open-ended tubular member held by said die plate and having one open end terminating at the back surface of said die plate, said member having another open end extending beyond the front surface of said die plate and terminating in a cutting edge, and a body of resilient material within said tubular member and having an outer diameter about equal to the inner diameter of said tubular member, said resilient body having a central void in the form of a passage extending completely through said resilient body from one end to the other end, said resilient body having one end terminating near the cutting edge of said tubular member, said resilient body having the other end terminating at said one open end of said tubular member, with said back surface of said die plate, said one end of said tubular member, and said other end of said resilient body being substantially in a common plane.

2. A cutting die according to claim 1 characterized by said body of resilient material being of incompressible gum rubber.

3. A cutting die for forming a hole in corrugated board or the like, said cutting die including a die plate having a front surface and a back surface, an open-ended tubular member held by said die plate and having one open end terminating at the back surface of said die plate, said member having another open end extending beyond the front surface of said die plate and terminating in a cutting edge, and a tubular body of resilient material within said tubular member and having an outer diameter about equal to the inner diameter of said tubular member and held therein by a friction fit, said resilient body having a central void in the form of a passage extending completely through said resilient body from one end to the other end, said resilient body having one end terminating near the cutting edge of said tubular member, said resilient body having the other end terminating near said one open end of said tubular member, said resilient body being reversible from end-to-end in said tubular member to place said other end of said resilient body near said cutting edge of said tubular member.

4. A cutting die according to claim 3 wherein said passage is of circular cross-sectional shape.