Visual inspection system of moving strip edges using cameras and a computer

• US 6,046,764 A
• Filed: 09/11/1997
• Issued: 04/04/2000
• Est. Priority Date: 05/25/1995
• Status: Expired due to Term

• Current Assignee: Gillette Company (The Procter & Gamble Company)
• Original Assignee: Gillette Company (The Procter & Gamble Company)
• Inventors: Kirby, George J., Ewing, Jon F., Borgeson, Arthur B.
• Primary Examiner(s): LEE, Y YOUNG
• Application Number:
  US08/927,301
• Time in Patent Office: 936 Days
• Field of Search: 348/86, 348/88, 348/91, 348/92, 348/125, 348/128, 348/131, 348/142, 348/143, 348/159, 348/89, 73/104, 73/105, 324/750, 356/69, 396/19
• US Class Current: 348/92
• CPC Class Codes: B26B 21/54 Razor-blades B26B21/4006 takes precedence
• CPC Class Codes: G01N 2021/8918 Metal
• CPC Class Codes: G01N 21/8903 using a multiple detector array

Abstract

A continuous edge of a strip of material is processed as it moves in a direction along the length of the strip. The condition of the continuous edge of the moving strip is inspected after it has been processed. The strip is cut into pieces. And the pieces are sorted into groups in response to the condition of the edge. The edge is continuously monitored by a pair of parallel, closely spaced laser beams. A visualization system includes a camera, a monitor, and a storage systems. The camera images an edge of the moving strip of material. The monitor, coupled to the camera, displays images captured by the camera. The storage system, coupled to the camera and the monitor, stores images captured by the camera. The monitor is capable of displaying the stored images.

Claims

1. A visualization system for razor blade manufacturing comprising

an inspector that detects defects in the edge of a moving strip of razor blade material moving along a path, said inspector being located at a first, upstream position along said path, said inspector generating a defect signal when a defect is detected, said inspector including at least one beam directed perpendicular to the direction of movement of the strip of razor blade material,

a camera for imaging an edge of said moving strip of razor blade material, said camera being independent of said inspector,

said camera being located downstream of said inspector at a second, downstream position along said path along said moving strip, said camera being controlled to only take pictures of particular portions of said strip, said particular portions being fewer than all portions of said strip, said camera being responsive to said defect signal to take a picture of said strip at a predetermined time subsequent to said defect signal such that a picture is taken of said defect that had been detected at said inspector at the time that said defect passes said camera at said second, downstream position,

a monitor, coupled to the camera, for displaying images of said defects captured by the camera, and

a storage system, coupled to the camera and the monitor, for storing images of said defects captured by the camera, the monitor being capable of displaying the stored images of said defects.

2. The visualization system of claim 1 further comprising a light source directed at the edge of the strip;

and wherein said camera is a first camera and lens, in close proximity to the light source and on a first side of the strip, where the first camera and lens takes pictures of the edge of the strip as the strip passes the first camera and lens; and

further comprising

a second camera and lens, in close proximity to the light source and on a second side of the strip, where the second camera and lens takes pictures of the edge of the strip as the strip passes the second camera and lens; and

a computer that receives pictures from the first and second cameras, generates digitized images of the pictures, and displays the digitized images on said monitor.

3. The visualization system of claim 2 wherein the computer receives the defect signal and causes the first camera and lens and the second camera and lens to take pictures of the strip at a predetermined time such that pictures are taken of detected defects.

4. The visualization system of claim 3, wherein the predetermined time is adjustable and wherein the computer includes an input device through which an operator can input timing adjustments to which the computer responds by causing the first camera and lens and the second camera and lens to take pictures of the strip at an adjusted predetermined time when defect signals are received.

5. The visualization system of claim 2, further comprising a storage system that stores the digitized images in response to instructions from the computer, and wherein an operator using an input device of the computer can cause the computer to retrieve stored digitized images from the storage system for display on the monitor.

6. The system of claim 1 wherein said inspector includes a pair of parallel, closely spaced laser beams.

7. A visualization system for razor blade manufacturing comprising

an inspector that detects defects in the edge of a moving strip of razor blade material and generates a defect signal when a defect is detected,

a camera for imaging an edge of said moving strip of razor blade material,

said camera being located downstream of said inspector along said moving strip and responsive to said defect signal to take a picture of said strip at a predetermined time such that a picture is taken of said defect,

a monitor, coupled to the camera, for displaying images captured by the camera, and

a storage system, coupled to the camera and the monitor, for storing images captured by the camera, the monitor being capable of displaying the stored images

wherein said inspector includes a pair of parallel, closely spaced laser beams, wherein the parallel laser beams include

a first laser system including a first projector for projecting a first laser beam at the edge in a direction perpendicular to the direction of movement of the strip and perpendicular to the edge and a first profile detector for detecting a portion of the first laser beam passing over the edge and for generating a first signal representing the detected portion of the first laser beam;

and

a second laser system, in close proximity to the first laser system, including a second projector, for projecting a second laser beam at the edge in a direction perpendicular to the direction of movement of the strip and perpendicular to the cutting edge and a second profile detector for detecting a portion of the second laser beam passing over the edge and for generating a second signal representing the detected portion of the second laser beam.

8. The system of claim 7, further comprising:

a normalizing circuit that receives the first and second signals from the first and second profile detectors, substantially filters out movement of the edge, and generates an edge discontinuity signal; and

a defect detection circuit that receives the edge discontinuity signal, processes the edge discontinuity signal to detect defects in the edge, and generates a defect signal in response to detected defects.