Method and apparatus for maintaining contact between the recording media and media support surface of a scanning system

• US 5,671,005 A
• Filed: 02/21/1995
• Issued: 09/23/1997
• Est. Priority Date: 02/21/1995
• Status: Expired due to Fees

• Current Assignee: Agfa Corporation (Agfa-Gevaert N.V.)
• Original Assignee: Bayer Intellectual Property GmbH (Bayer AG)
• Inventors: McNay, Robert P., LeMay, Norris C., Pepe, Robert D., Garand, Donald J., Viola, David P.
• Primary Examiner(s): Reinhart, Mark J.
• Application Number:
  US08/393,104
• Time in Patent Office: 945 Days
• Field of Search: 347/262, 347/264, 347/139
• US Class Current: 347/262
• CPC Class Codes: H04N 1/08 Mechanisms for mounting or holding the sheet around the drum
• CPC Class Codes: H04N 1/0826 Holding or supporting the sheet in the vicinity of the scanning element
• CPC Class Codes: H04N 1/0839 Mechanical clamps, i.e. means for holding the sheet against the drum by mechanical force
• CPC Class Codes: H04N 1/0856 Suction or vacuum means
• CPC Class Codes: H04N 1/0873 for holding the sheet on the internal surface of the drum
• CPC Class Codes: H04N 1/0886 Mounting the sheet from a roll

Abstract

A method and apparatus for maintaining contact between the recording media and the media support surface of a scanning system. A pressure load is applied on the recording media in the immediate vicinity of a scanning laser beam, thereby ensuring surface to surface contact between the recording media and the media support surface while scanning.

Claims

1. In an optical scanner including an internal drum and an optical arrangement for directing a scanning laser beam toward a quantity of recording media disposed on said internal drum, a method for maintaining contact between said internal drum and said recording media, comprising the steps of:

positioning said recording media on said internal drum; and

,

applying a mechanical pressure load against said recording media immediately adjacent said scanning laser beam, said pressure load forcing said recording media against said internal drum.

2. The method according to claim 1, wherein said step of applying a pressure load further includes the step of:

applying said pressure load against said recording media on opposing sides of said scanning laser beam, said pressure load forcing said recording media against said internal drum about said scanning laser beam.

3. The method according to claim 1, wherein said step of applying a pressure load further includes the step of:

removably applying said pressure load against said recording media.

4. The method according to claim 3, wherein said step of removably applying said pressure load further includes the steps of:

applying said pressure load when said recording media is stationary; and

removing said pressure load during a displacement of said recording media.

5. The method according to claim 1, wherein said optical scanner further includes an apparatus for displacing said optical arrangement and said scanning beam along said internal drum, and wherein said step of applying a pressure load further includes the step of:

cleaning a section of said recording media adjacent said scanning beam immediately before said scanning beam contacts said section of recording media as said scanning beam is displaced along said internal drum.

6. The method according to claim 5, wherein said cleaning step further includes the step of:

sweeping a brush assembly over said recording media immediately before said scanning beam contacts said section of recording media.

16. The method according to claim 1, wherein said step of applying a pressure load includes the step of:

applying a brush assembly against said recording media immediately adjacent said scanning beam to force said recording media against said internal drum.

7. An optical scanner including:

a support surface for supporting an element to be scanned;

an optical arrangement for directing a scanning laser beam toward the element supported on said support surface; and

means for applying a mechanical pressure load against said element immediately adjacent said scanning laser beam, said pressure load forcing said element to be scanned against said support surface.

8. The optical scanner according to claim 7, further including:

means for displacing said optical arrangement along said support surface; and

an arrangement for mounting said pressure applying means to said optical arrangement, wherein said pressure applying means is displaced along said support surface in response to a displacement of said optical arrangement.

9. The optical scanner according to claim 7, further including:

a hollow shield, coupled to said optical arrangement, for enclosing said scanning laser beam, said hollow shield further including a pair of opposing fan shaped members, each opposing fan shaped member having a distal end section disposed adjacent said support surface; and

an arrangement for mounting said pressure applying means to the distal end section of said pair of opposing fan shaped members.

10. The optical scanner according to claim 7, wherein said pressure applying means includes at least one brush member for forcing said element to be scanned against said support surface.

11. The optical scanner according to claim 7, wherein said pressure applying means further includes:

means for retractably applying said pressure load against said element to be scanned.

12. The optical scanner according to claim 11, wherein said means for retractably applying said pressure load against said element to be scanned further includes:

means for applying said pressure load when said element to be scanned is stationary; and

means for removing said pressure load during a displacement of said element to be scanned.

13. In an optical scanner including a media support surface, a supply of recording media positioned on said media support surface and an optical arrangement for directing a scanning laser beam toward said recording media, a method for maintaining contact between said media support surface and said recording media during a scanning operation, comprising the steps of:

positioning said recording media on said media support surface; and

,

applying a mechanical pressure load against said recording media immediately adjacent said scanning laser beam, said pressure load forcing said recording media against said media support surface.

14. The method according to claim 13, wherein said pressure applying step further includes the step of:

applying a pressure load against said recording media on opposing sides of said scanning laser beam, said pressure load forcing said recording media against said media support surface about said scanning laser beam.

15. The method according to claim 13, further including the step of:

drawing the recording media against the media support surface by applying a vacuum between said recording media and said media support surface.

17. The method according to claim 13, wherein said step of applying a pressure load includes the step of:

applying a brush assembly against said recording media immediately adjacent said scanning beam to force said recording media against said media support surface.