Paper feeding roller
AssigneeSumitomo Rubber Industries, Ltd.
InventorsMasashi Hamakubo, Akihiro Mine
Life of this patent
Estimating the term…
Abstract
Provided is a paper feeding roller in which recesses due to deformation are unlikely to be formed even when contact with another roller in one location continues for a comparatively long period of time, particularly as a conveying roller or the like. A paper feeding roller that has a shaft measuring 6 mm in exterior diameter pressure-welded to the outer circumferential surface under a load of 600 g in a high-temperature environment of 60° C. for 24 hours is left at room temperature for eight hours while being pressure-welded, after which the recess amount obtained using the difference (T)0−T1, between the thickness T1 (mm) of the position where the shaft was pressure-welded and the thickness T0 (mm) of a position where the shaft was not pressure-welded, is 0.1 mm or less.
Claims6
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 %.
Dependencies are inferred from the claim text.