US 12,330,904 B2
Medium conveying apparatus to detect multi-feed based on continuous overlap portion
Masaaki Sakai, Kahoku (JP)
Assigned to PFU LIMITED, Kahoku (JP)
Filed by PFU Limited, Kahoku (JP)
Filed on Oct. 11, 2023, as Appl. No. 18/379,131.
Application 18/379,131 is a continuation of application No. 17/674,775, filed on Feb. 17, 2022, granted, now 11,820,624.
Claims priority of application No. 2021-034620 (JP), filed on Mar. 4, 2021.
Prior Publication US 2024/0034584 A1, Feb. 1, 2024
Int. Cl. B65H 7/12 (2006.01); B65H 3/06 (2006.01); B65H 7/18 (2006.01)
CPC B65H 7/125 (2013.01) [B65H 3/063 (2013.01); B65H 7/18 (2013.01); B65H 2511/13 (2013.01); B65H 2553/30 (2013.01); B65H 2553/82 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A medium conveying apparatus comprising:
a conveying roller to convey a medium;
an overlap detection sensor to detect an overlap on the medium conveyed by the conveying roller;
a processor to
calculate an overlap length over which the overlap is continuous, based on outputs of the overlap detection sensor,
determine whether a multi-feed has occurred based on the overlap length, and
execute an abnormal processing when multi-feed is determined to have occurred, wherein
the overlap detection sensor detects overlaps at a plurality of positions within the medium, wherein
in calculating the overlap length, the processor determines that a first overlap portion and a second overlap portion are continuous when a distance between the first overlap portion and the second overlap portion is within a predetermined distance, wherein the first overlap portion and the second overlap portion are portions where the output of the overlap detection sensor detects overlap, and wherein
the predetermined distance is set to a value larger than a distance between adjacent positions among the plurality of positions at which overlap detection is performed.