Paper-feeding roller
AssigneeSumitomo Rubber Industries, Ltd.
InventorsYasuchika Ito, Hirokazu Nishimori, Takeshi Ishimaru, Noriaki Hitomi
Life of this patent
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Abstract
A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.
Claims11
A paper-feeding roller comprising a core and an annular elastic member mounted on a peripheral surface of said core,
- wherein said annular elastic member has a three-layer construction composed of a non-foamed inner layer having a JIS-A hardness of 1 to 10 degrees and a thickness of 2 to 10 mm;
- a non-foamed intermediate layer having a JIS-A hardness of 30 to 80 degrees and a thickness of 0.05 to 0.2 mm;
- and a non-foamed outer layer
- having a JIS-A hardness of 25 to 60 degrees and a thickness of 1 to 3 mm;
- said inner layer being made of rubber composition containing not less than 25 to 70 parts by weight of a carbon black and 150 to 300 parts by weight of a paraffin oil for 100 parts by weight of an ethylene-propylene-diene rubber (EPDM rubber);
- and said outer layer being made of rubber composition containing not less than 25 to 70 parts by weight of a mineral inorganic filler and not more than 300 parts by weight of a paraffin oil for 100 parts by weight of a EPDM rubber.
Dependencies are inferred from the claim text.