US 9,809,405 B2
Paper feeding roller
Masashi Hamakubo, Kobe (JP); and Akihiro Mine, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo (JP)
Appl. No. 15/30,298
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-shi, Hyogo (JP)
PCT Filed Sep. 25, 2014, PCT No. PCT/JP2014/075519
§ 371(c)(1), (2) Date Apr. 18, 2016,
PCT Pub. No. WO2015/060062, PCT Pub. Date Apr. 30, 2015.
Claims priority of application No. 2013-219229 (JP), filed on Oct. 22, 2013; and application No. 2014-137951 (JP), filed on Jul. 3, 2014.
Prior Publication US 2016/0251190 A1, Sep. 1, 2016
Int. Cl. B65H 27/00 (2006.01); C08L 23/16 (2006.01)
CPC B65H 27/00 (2013.01) [C08L 23/16 (2013.01); B65H 2401/111 (2013.01); B65H 2402/80 (2013.01); B65H 2404/11 (2013.01); B65H 2601/24 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A paper feeding roller formed of a rubber composition such that the paper feeding roller has a tubular shape having a through hole through which a shaft is inserted, wherein
(A) the shaft is inserted through and fixed in the through hole and after leaving still for 24 hours in a state where another shaft of φ6 mm outer diameter is press-contacted against a single location of an outer peripheral surface by applying a load of 600 g and under a high temperature environment of 60° C. and then leaving still for 8 hours at room temperature while maintaining the press-contacted state, a recess amount, determined from a thickness T1 (mm) at a position at which the shaft was press-contacted and a thickness T0 (mm) at a position at which the shaft was not press-contacted and using formula (1):
Recess amount=T0−T1  (1)
is not more than 0.1 mm,
(B) the rubber composition includes rubber components constituted of just one type or two or more types of low-ethylene propylene diene rubber with an ethylene content of not more than 55 mass % and one type or two or more types of high-ethylene propylene diene rubber with an ethylene content exceeding 55 mass %, and
(C) the blending proportion in the rubber composition of the high-ethylene propylene diene rubber and the low-ethylene propylene diene rubber as expressed as the blending proportion of the low-ethylene propylene diene rubber in the total amount of the rubber components is 30 mass % to 80 mass %.