Patent ID: 6913723

Claim:
A method of manufacturing a guide roller for the magnetic tape cassette comprising steps of: injecting a first resin between a sleeve slidably attached to an insert pin and a cylindrical cavity of a first cavity plate so as to mold a tubular primary molding; leaving said tubular primary molding by withdrawing said first cavity plate; moving a mold onto the outer periphery of said primary molding, said mold comprising a core plate and a cavity plate which define a barrel shaped cavity having its maximum diameter at its parting line when said core and cavity plates are closed, said core plate having a half of said barrel shaped cavity, and said cavity plate having the remaining half of said barrel shaped cavity, disposing a gate within said primary molding; and withdrawing said sleeve; injecting a second resin between the inner side of said primary molding and said insert pin through said gate; and bulging said primary molding into the shape of said barrel shaped cavity by an injecting pressure to integrate said primary molding with said second resin injected within said primary molding.