The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 1994
Filed:
Oct. 26, 1993
John A Korbonski, San Juan Capistrano, CA (US);
Eugene C Greenwood, Costa Mesa, CA (US);
Systems Division Incorporated, Mission Viejo, CA (US);
Abstract
Apparatus for cleaning foreign particles from the surface of sheets of material, such as printed circuit boards during fabrication processing. Two pairs of sheet cleaning rollers are located along the sheet path, and the sheet is passed through the nips between the pairs of rollers. The rollers have a surface tack sufficient to transfer the foreign particles from the surfaces of the sheet to the cleaning roller surfaces. Upper and lower roller cleaning rolls having surfaces of even greater surface tack are arranged in tangential contact with respective ones of the sheet cleaning rollers. The surfaces of the roller cleaning rolls have even greater surface tack, sufficient to transfer the foreign particles from the sheet cleaning rollers to the cleaning roll surfaces. An adjustable preload force is applied to each roller cleaning roll to urge each roll against the sheet cleaning roller surfaces. The adjustable preload force also controls the nip pressure between the cleaning rollers and the sheet surface improving the cleaning ability of the system. The apparatus further includes a system for preventing delamination of layers of the sheet. Endless belts are reeved about pulleys and about grooves formed in the sheet cleaning rollers, and provide a belt region remaining in contact with the sheet even after the region of the sheet has passed through the nip of the cleaning rollers. This prevents the outer layer of the sheet from lifting away from the body of the sheet.