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:
Mar. 17, 1992
Filed:
Mar. 20, 1991
Haruhisa Madate, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A sheet extracting mechanism is provided with a suction cup for attracting one of stacked sheets, a negative pressure source for supplying a suction force to the suction cup, a detector for detecting the pressure in the suction cup, a moving mechanism for moving the suction cup thereby extracting the sheet adhered to the suction cup by the section force, and a discriminator for comparing the suction force in the suction cup with a predetermined pressure, at a predetermined position located a predetermined distance from the bottom of the stack of sheets, thereby identifying the amount of the stacked sheets. The suction cup is temporarily stopped at the predetermined position corresponding to a predetermined number of remaining sheets, and the remaining number of sheets is identified equal to or less than the predetermined number when the suction cup no longer touches the sheet, thereby becoming unable to attract the sheet.