Rotary apparatus for punching apertures into corrugated board material

• US 3,946,627 A
• Filed: 02/11/1974
• Issued: 03/30/1976
• Est. Priority Date: 02/16/1973
• Status: Expired due to Term

• Current Assignee: Alfred Hofmann
• Original Assignee: Alfred Hofmann
• Inventors: Hofmann, Alfred
• Primary Examiner(s): Yost, Frank T.
• Application Number:
  US05/441,725
• Time in Patent Office: 778 Days
• Field of Search: 83/117, 83/103, 83/116, 83/115, 83/140, 93/36 A, 76/107 C
• US Class Current: 83/117
• CPC Class Codes: B26D 7/1818 by pushing out
• CPC Class Codes: B26F 1/10 Roller type punches
• CPC Class Codes: Y10T 83/2109 Resiliently mounted

Abstract

A rotary cylinder is mounted opposite abutment means, and has a metal strip upstandingly mounted on the cylinder, with an exposed edge for cutting out a portion of said material. In order to automatically eject the cutout portions, at least one resilient ejector is mounted on the cylinder, within and adjacent the cutting strip. Advantageously, the ejector is provided in form of telescoping, outwardly spring-loaded shells, mounted on the cylinder to extend generally radially of the cylinder.

Claims

1. Rotary apparatus for punching apertures into corrugated board material, comprising rotatable cylinder means having a peripheral surface;

board abutment means opposite and spaced from said peripheral surface;

knife means on said cylinder means, said knife means having a cutting edge for cutting out a portion of board material fed between said peripheral surface and said abutment means during rotation of said cylinder means;

spring-loaded ejector means for displacing the cut-out portion of the board material relative to the remainder thereof during further rotation of said cylinder means, said ejector means including telescopingly-arranged shells and a spring disposed within said shells; and

mounting means for removably mounting said knife means and said ejector means on said rotatable cylinder means.

2. Apparatus as defined in claim 1, wherein said knife means comprises a strip of steel, and means for mounting said strip substantially radially projecting from said cylinder means.

3. Apparatus as defined in claim 1, wherein said abutment means comprises another cylinder, rotatably mounted to define with said one cylinder means a gap for passage of the corrugated board material through said gap incident to said cutting.

4. Apparatus as defined in claim 3, wherein said other cylinder has surface structure slightly compressible incident to said cutting.

5. Apparatus as defined in claim 1, and including additional abutment means comprising substantially rigid sheet means mounted opposite said cylinder means, for abutting said remainder of board material while the cut out portion is displaced relative to said remainder.

6. Apparatus as defined in claim 1, wherein said ejector means includes a leaf spring having one end secured to said rotatable cylinder means.

7. Apparatus as defined in claim 6, wherein the leaf spring has a free end in rounded form, to facilitate passage into the working area of the machine.

8. Apparatus as defined in claim 1, wherein the ejector means comprises a plurality of ejectors, all disposed adjacent said knife means.

9. Apparatus as defined in claim 1, wherein said shells are mounted in positions slightly inclined to their direction of travel with said rotatable cylinder means.

10. Rotary apparatus for punching apertures into corrugated board material, comprising rotatable cylinder means having a peripheral surface;

board abutment means opposite and spaced from said peripheral surface;

knife means on said cylinder means, said knife means having a cutting edge defining an outline for cutting out a portion of board material fed between said peripheral surface and said abutment means during rotation of said cylinder means; and

a plurality of springloaded ejector means spaced from one another and mounted on said cylinder means within said outline and operative to displace the cut-out portion of the board material relative to the remainder thereof during further rotation of said cylinder means, said ejector means normally projecting beyond said cutting edge by a distance radially of said cylinder means, at least equal to the normal thickness of the corrugated board material.

11. Apparatus as defined in claim 10, wherein said ejector means normally projects beyond said cutting edge by a distance slightly greater than said normal thickness.

12. A rotary apparatus for punching apertures into corrugated board material, comprising rotatable cylinder means having a peripheral surface;

board abutment means opposite and spaced from said peripheral surface;

knife means on said cylinder means, said knife means having a cutting edge defining an outline for cutting out a portion of board material fed between said peripheral surface and said abutment means during rotation of said cylinder means; and

a plurality of spring-loaded ejector means spaced from one another and mounted on said cylinder means within said outline and operative to displace the cut-put portion of the board material relative to the remainder thereof during further rotation of said cylinder means, said ejector means having a first shell having one end secured to said rotatable cylinder means, a second shell concentric with said first shell, and a compression spring disposed within said shells to bias said second shell in an outward direction relative to said cylinder means.

13. Apparatus as defined in claim 12 including mounting means for removably mounting said knife means and ejector means on said rotatable cylinder means.

14. Apparatus as defined defined in claim 13, wherein said ejector means includes mutually telescoping shells, one of said shells being secured to said mounting means and extending through the same;

and a closure of the said last-mentioned shell providing an abutment for said spring and removably arranged at the inner end of said one shell.

15. Apparatus as defined in claim 12, including additional shell means telescopingly arranged with respect to the aforementioned shells.

16. Rotary apparatus for punching apertures into corrugated board material, comprising rotatable cylinder means having a peripheral surface;

board abutment means opposite and spaced from said peripheral surface;

knife means on said cylinder means, said knife means having a cutting edge for cutting out a portion of board material fed between said peripheral surface and said abutment means during rotation of said cylinder means;

resilient ejector means mounted on said cylinder means to displace the cut-out portion of the board material relative to the remainder thereof during further rotation of said cylinder;

additional abutment means having substantially rigid sheet means including a series of metal sheets, said additional abutment means mounted opposite said cylinder means for abutting said remainder of board material while the cut-out portion is displaced relative to said remainder;

a support rod mounted adjacent said cylinder means and extending substantially parallel to the axis of said cylinder means; and

means for adjustably mounting said metal sheets on said support rod.

17. Rotary apparatus for punching apertures into corrugated board material, comprising rotatable cylinder means having a peripheral surface;

board abutment means opposite and spaced from said peripheral surface;

knife means on said cylinder means, said knife means having a cutting edge for cutting out a portion of board material fed between said peripheral surface and said abutment means during rotation of said cylinder means; and

resilient ejector means mounted on said cylinder means to displace the cut-out portion of the board material relative to the remainder thereof during further rotation of said cylinder, said ejector means having a first shell including one end secured to said cylinder means, a second shell concentric with said first shell, said shells being mounted in positions slightly inclined to their direction of travel with said cylinder means, and a compression spring disposed within said shells to bias said second shell in an outward direction relative to said cylinder means.