Paper feeding roller
AssigneeSumitomo Rubber Industries, Ltd.
InventorsMasashi HAMAKUBO, Akihiro MINE
Life of this patent
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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.
Claims3
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
- 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, wherein
- the rubber composition includes rubber components and sulfur as a crosslinking agent with a function of crosslinking the rubber components,
- the rubber components are constituted of at least two types of rubber including an ethylene propylene diene rubber at a blending proportion of not less than 50 mass % of the total amount of the rubber components, and
- a blending proportion of the sulfur is not less than 0.3 parts by mass and not more than 2 parts by mass with respect to 100 parts by mass of the total amount of the rubber components.
Dependencies are inferred from the claim text.