US2014087932A1PendingUtilityA1

Paper feed roller

49
Assignee: SUMITOMO RUBBER INDPriority: Dec 1, 2009Filed: Dec 3, 2013Published: Mar 27, 2014
Est. expiryDec 1, 2029(~3.3 yrs left)· nominal 20-yr term from priority
Inventors:Yasuchika ItoHirokazu Nishimori
B65H 2401/111G03G 2215/00683C08L 7/00C08L 9/06B65H 27/00C08L 9/00C08L 23/16C08K 5/01C08K 5/14
49
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Claims

Abstract

To provide a paper feed roller which hardly causes deterioration in the frictional coefficient due to paper powder accumulation and an accompanying paper conveyance failure, and can keep excellent paper feeding for a longer period. A paper feed roller 1 including a roller main body 2 made of a rubber composition which contains EPDM, IR, and BR or SBR as rubber components, where the mass ratio R 1 of the three kinds of rubber components expressed by the following equation (1): R 1 =M EPDM /( M IR +M x )  (1) (in the equation, M EPDM represents the parts by mass of EPDM, M IR represents the parts by mass of IR, and M x represents the parts by mass of BR or SBR) is not less than 25/75 and not more than 75/25.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A paper feed roller made of a rubber composition, wherein the rubber composition contains, as rubber components, ethylene propylene diene rubber (EPDM), isoprene rubber (IR), and butadiene rubber (BR), and the mass ratio R 1  of the three rubber components is expressed by the equation (1)′:
     R   1   =M   EPDM /( M   IR   +M   BR )  (1)′
 
 wherein M EPDM  represents the parts by mass of EPDM, M IR  represents the parts by mass of IR, and M BR  represents the parts by mass of BR, and wherein R 1  is not less than 30/70 and not more than 50/50. 
 
     
     
         2 . The paper feed roller according to  claim 1 , wherein the rubber composition contains isoprene rubber (IR) and butadiene rubber (BR) the parts by mass of which satisfy the following equation (2)′:
     M   IR   >M   BR   (2)′
 
 wherein M IR  represents the parts by mass of IR, and M BR  represents the parts by mass of BR. 
 
     
     
         3 . The paper feed roller according to  claim 1 , wherein the rubber composition is cross-linked by a peroxide cross-linking agent. 
     
     
         4 . The paper feed roller according to  claim 2 , wherein the rubber composition is cross-linked by a peroxide cross-linking agent.

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