US 11,724,527 B2
Roller, medium-transporting device, liquid ejecting apparatus, and method of manufacturing roller
Yosaku Tamura, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 24, 2021, as Appl. No. 17/534,682.
Claims priority of application No. 2020-196412 (JP), filed on Nov. 26, 2020.
Prior Publication US 2022/0161576 A1, May 26, 2022
Int. Cl. B41J 11/00 (2006.01); B41J 13/076 (2006.01); B41J 2/01 (2006.01); B65H 29/20 (2006.01); B65H 5/06 (2006.01); B41J 11/04 (2006.01)
CPC B41J 13/076 (2013.01) [B41J 2/01 (2013.01); B41J 11/0045 (2013.01); B41J 11/04 (2013.01); B65H 5/066 (2013.01); B65H 5/068 (2013.01); B65H 29/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A roller that transports a medium, the roller comprising:
a wheel having a plurality of teeth on a peripheral surface; and
holders that hold n wheels, which satisfy condition 1 and condition 2, such that the n wheels are stacked in an axial direction, n being a natural number of 2 or more,
Pr=Pt/n, wherein  condition 1:
Pr is a tooth pitch of the roller, and Pt is a tooth pitch of the wheel, and
condition 2: a minimum value of sums of angles each formed by a reference tooth and another reference tooth adjacent to the reference tooth in a circumferential direction of one to n wheels is greater than 180 degrees, wherein
one of the plurality of teeth is a reference tooth, and one of the n wheels is a reference wheel,
a wheel having a reference tooth nearest to the reference tooth of the reference wheel in the circumferential direction when viewed in a rotational axis direction of the wheel is a second wheel, and
wheels having reference teeth near to the reference tooth of the reference wheel in a direction identical to a direction in which the reference tooth of the second wheel is positioned with respect to the reference tooth of the reference wheel are second to nth wheels sequentially.