Method and apparatus for visually inspecting a substrate on a printing press

• US 6,867,423 B2
• Filed: 09/17/2002
• Issued: 03/15/2005
• Est. Priority Date: 09/17/2002
• Status: Active Grant

• Current Assignee: Baldwin Americas Corporation (Forsyth Baldwin LLC)
• Original Assignee: Quad/Tech Incorporated
• Inventors: Warner, Paul
• Primary Examiner(s): Allen, Stephone B.
• Assistant Examiner(s): Lee, Patrick J.
• Application Number:
  US10/245,469
• Publication Number:
  US 20040051061A1
• Time in Patent Office: 910 Days
• Field of Search: 250/559.29, 250/559.3, 250/559.37, 271226-227, 271233-234, 271242-245
• US Class Current: 250/559.29
• CPC Class Codes: B41F 33/0036 Devices for scanning or checking the printed matter for quality control

Abstract

The present invention relates generally to the field of printing presses, and specifically to a method and apparatus for visually inspecting a web moving on a printing press using a CMOS based image recording device and preferably a LED light source.

Claims

1. A visual inspection system configured to be in optical communication with a substrate of a printing press, said visual inspection system comprising:

a CMOS image recording device configured to record images printed on the substrate,

a processing unit coupled to the recording device, wherein the processing unit is configured to generate an output, and

an illumination system of the non-strobe, non-incandescent type, wherein said illumination system includes a plurality of LEDs wherein said plurality of LEDs are in a circular configuration.

2. The visual inspection system of claim 1 where said circular configuration surrounds said recording device.

3. A visual inspection system configured to be in optical communication with the substrate of a printing press, said visual inspection system comprising:

a CMOS image recording device configured to record images from the substrate,

a control system coupled to said recording device, wherein the control system uses the recorded image of the substrate to control operation of the printing press, and

an illuminator of the non-strobe and non-incandescent type wherein said illuminator includes a plurality of LEDs wherein said LEDs are arranged in one of a rectangular and a circular configuration.

4. The visual inspection system of claim 3 wherein said configuration surrounds said recording device.

5. A visual inspection system configured to be in optical communication with the substrate of a printing press, said visual inspection system comprising:

a CMOS image recording device configured to record images from the substrate,

a control system coupled to said recording device, wherein the control system uses the recorded image of the substrate to control operation of the printing press, and wherein said recording device is stationary.

6. The visual inspection system of claim 5 wherein said recording device is fixed relative to the printing press.

7. A visual inspection system configured to be in optical communication with a substrate of a printing press, said visual inspection system comprising:

a CMOS image recording device configured to record images printed on the substrate;

a control system coupled to said recording device, wherein the control system uses the recorded image to control operation of the printing press; and

an illumination system including a plurality of LEDs arranged in a configuration surrounding said recording device.

8. A visual inspection system configured to be in optical communication with a web of a web offset printing press, said visual inspection system comprising:

a CMOS image recording device configured to record images printed on the web;

a control system coupled to said recording device, wherein the control system uses the recorded image to control operation of the printing press; and

an illumination system including a plurality of high intensity LEDs arranged in a configuration surrounding said recording device.

9. A visual inspection system configured to be in optical communication with a substrate of a printing press, said visual inspection system comprising:

a CMOS image recording device configured to record images printed on the substrate, and

a plurality of LEDs adjacent said recording device and positioned to illuminate the substrate, wherein said recording device includes a lens and wherein said LEDs are arranged in a circular orientation surrounding said lens.

10. A method of visually inspecting a web of a web offset printing press, the method comprising:

providing a camera assembly including a CMOS image recording device configured to record images printed on the web;

illuminating the web with a plurality of LEDs surrounding the CMOS recording device;

recording at least one image using the CMOS image recording device;

generating an output; and

controlling an aspect of the printing press in response to said output.

11. An illumination arrangement for an image recording device on a printing press, said illumination arrangement adapted to illuminate the substrate of the printing press and comprising:

a plurality of high intensity LEDs arranged in a circular configuration surrounding the recording device.

12. A visual inspection system configured to be in optical communication with a substrate of a printing press, said visual inspection system comprising:

a plurality of CMOS image recording devices configured to record images printed on the substrate; and

a processing unit coupled to each of said plurality of recording devices and adapted to process the recorded images wherein each of said plurality of recording devices is fixed relative to the printing press.