Patent ID: 6949013

Claim:
A peripheral length correction device of metal rings with at least two rollers upon which a metal ring is laid, which are displaceable in mutually separating directions, whereby tensile stress can be applied to said metal ring by displacing one or both of said rollers while rotating said rollers to correct a peripheral length thereof, said device is characterized by comprising: a removal means for removing foreign substances adhered to an inner peripheral surface of said metal ring; and a re-adhesion prevention means for preventing re-adhesion of said foreign substances removed by said removal means to said metal ring; said removal means has an abutting body which is abutted on the inner peripheral surface of said metal ring by a predetermined pressing force; said abutting body is driven by a predetermined driving mechanism; said driving mechanism can move said abutting body in a short direction of the inner peripheral surface of said metal ring laid upon said rollers; and said abutting body when said metal ring is set to said rollers after being placed in a standby position separated from within said metal ring is moved to within said metal ring and said abutting body is made to contact said metal ring inner peripheral surface by said driving mechanism.