Slitter for tamper-evident closures

• US 5,636,958 A
• Filed: 02/10/1995
• Issued: 06/10/1997
• Est. Priority Date: 02/10/1995
• Status: Expired due to Fees

• Current Assignee: Nestec Machine Systems Limited
• Original Assignee: Nestech Machine Systems, Inc.
• Inventors: Foldesi, Steven Jr., Foldesi, Steven
• Primary Examiner(s): Hail, III, Joseph J.
• Assistant Examiner(s): OJINI, EZIAMARA ANTHONY
• Application Number:
  US08/386,439
• Time in Patent Office: 851 Days
• Field of Search: 413/10, 413/12, 413/67, 83/676, 83/678, 83/879, 83/880, 83/946, 264/154, 425/809, 215/252, 215/253
• US Class Current: 413/10
• CPC Class Codes: B26F 1/18 Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
• CPC Class Codes: B26F 2210/04 Making plastic pilferproof screw caps by cutting a tamper ring
• CPC Class Codes: Y10S 83/946 Container
• CPC Class Codes: Y10T 83/0333 Scoring
• CPC Class Codes: Y10T 83/9408 Spaced cut forming tool

Abstract

A rotary slitter for container closures of varying sizes is disclosed. The embodiments include swivel housings to permit rapid changing of internal tools, and a rectilinear knife blade which eliminates adjustment problems normally occurring with curved knife blades.

Claims

1. In a rotary slitter for container closures for forming a separable tamper indicating ring on a skirt portion of said closures, said slitter including a relatively stationary hub mounting a sun gear, a rotating dial mounting a plurality of star gears engaging said sun gear, each of said star gears driving a rotary arbor supporting closures on an internal tool against a knife blade for slitting said skirt, the improvement comprising:

said sun gear having a tooth bearing periphery including alternately spaced arcuate and rectilinear segments, a pivotally mounted arbor housing rotationally supporting said arbor and shifting said arbor about a pivot point spaced from the axis of rotation of said arbor to enable said star gear to continuously engage both arcuate and rectilinear segments of said sun gear;

and a segmented slitting knife having a rectilinear cutting edge operative to slit closures when said star gear is engaged with a rectilinear segment of said sun gear.

2. The improvement in accordance with claim 1, further comprising resilient means for urging said star gears into continuous engagement with said sun gear.

3. The improvement in accordance with claim 1, said arbor housing having an arcuate path of motion sufficient to enable the positioning of internal tools of differing diameters upon said arbor.