Waste repellent die structure

• US 5,701,789 A
• Filed: 04/10/1995
• Issued: 12/30/1997
• Est. Priority Date: 04/10/1995
• Status: Expired due to Fees

• Current Assignee: Best Cutting Die Co.
• Original Assignee: Best Cutting Die Co.
• Inventors: Okonski, Frank
• Primary Examiner(s): Peterson, Kenneth E.
• Application Number:
  US08/419,185
• Time in Patent Office: 995 Days
• Field of Search: 83/98, 83/100, 83/123, 83/128, 83/346, 83/698.42, 83/134, 83/136, 83/140, 83/143, 83/117, 83/118, 83/698.21, 83/653, 83/13
• US Class Current: 83/13
• CPC Class Codes: B26D 2007/2607 for mounting die cutters
• CPC Class Codes: B26D 7/1818 by pushing out
• CPC Class Codes: B26D 7/1854 by air under pressure
• CPC Class Codes: B26D 7/2614 Means for mounting the cutting member
• CPC Class Codes: Y10T 83/04 Processes
• CPC Class Codes: Y10T 83/2066 By fluid current
• CPC Class Codes: Y10T 83/2109 Resiliently mounted
• CPC Class Codes: Y10T 83/2133 By resiliently biased ejector
• CPC Class Codes: Y10T 83/9466 Flexible sleevelike tool

Abstract

A cutting die system having an improved waste or scrap removal system is provided. Curved edge patterns are cut into the cutting die plate within the parameters of the cutting edge. These partial cutouts having curved edges are provided so that when the cutting die is mounted to the die cylinder, the bending of the cutting die to fit the curvature of the die cylinder causes the cut out shape to pop up. The direction of the pop-up cut out shape is complementary to the relative direction of rotation of the cutting die and the height of the projections remains below the cutting edge height. When the pop-up cut out shape comes in contact with the waste or scrap material, the waste or scrap material is pushed outward and away from the direction of the die cylinder.

Claims

1. A waste repellent system for use in removing scrap material from a cutting die, said system comprising:

a cylindrical die holder for rotation about an axis;

a flexible cutting die plate, said flexible cutting die plate comprising;

a substantially flexible sheet-like material having a sheet surface defined by leading, trailing and opposing side edges, a pattern surface having leading and side impression surfaces raised to a predetermined height above the sheet surface said impression surfaces defining an impression area for cutting a pattern into a web or blank, said impression area comprising a plurality of push pattern projections formed within and of said sheet like material at predetermined locations of said area, such that said pop-up push patterns are bendable into being coplanar with said sheet-like material and biased away from said impression surface for repelling scrap material from said cutting, die plate.

2. The system as in claim 1, wherein said cutting die plate is further comprised of an alignment means which cooperates with the die holder for accurately aligning said cutting die plate.

3. The system as in claim 1, wherein the pattern surface area is a rectangle.

4. The system as in claim 1, wherein the push pattern projections comprise semi-circle cut-outs.

5. The system as in claim 1, wherein the push pattern projections comprise horseshoe shaped cut-outs.

6. The system as in claim 1, wherein said push pattern projections for repelling waste are formed at predetermined locations of said flexible cutting die plate that are outside said area.

7. The system as in claim 1, wherein said cutting die plate is further comprised of orifices for communicating pressurized air located upon said pattern surface area.

8. The system as in claim 7, wherein said push pattern projections are substantially aligned with said orifices.

9. The system as in claim 1, wherein said holder is characterized as a magnetic holder.

10. The system as in claim 1, wherein said system is further comprised of means for blowing said scrap away from the cutting die plate.

11. The system as in claim 1, further characterized by said die holder rotation creating centrifugal force that correspondingly maximizes said push pattern projection scrap repelling force by bending said push pattern projections away from said die plate surface.

12. The system as in claim 1, wherein said holder is characterized as a non-magnetic holder.

13. A method for removing scrap material from a flexible cutting die plate which is positioned on a rotary die holder cooperating with an anvil, said method comprising the steps of:

affixing the flexible cutting die plate to the rotary die holder, said flexible cutting die plate comprising an impression surface, said impression surface having a pattern surface area comprising bendable push pattern projections that are formed in and of said flexible die plate, such that said pop-up push patterns are bendable into being coplanar with said cutting die plate and biased away from the impression surface for repelling scrap material from said cutting die plate;

rotating the die holder thereby causing said bendable push pattern projections to bendably extend and push said scrap material from the flexible cutting die plate.

14. The method as set forth by claim 13, further including the step of having pressurized air pass through orifices located in said pattern surface thereby further repelling scrap material.