Patent ID: 6457339
Filing Date: 2002-10-01
Classification: B21J

Abstract:
In a rocking press machine comprising a metal die adapted to swing about a vertex at a lower end thereof and a rocking shaft mounted above the metal die and transmitting a swinging motion to the metal die, with an angle of eccentricity of the central axis thereof and an angular velocity of the orbiting motion thereof being adjustable, the improvement comprising:a friction disk provided between the metal die and the rocking shaft, the friction disk having an upper surface in friction contact with a lower surface of the rocking shaft and a lower surface in friction contact with an upper surface of the metal die, a gyro enclosing the metal die, supports provided outside the gyro, first projections projecting outward from the metal die, first recesses to rotatably support the first projections therein and formed in the gyro, second projections projecting from one of the gyro and supports, and second recesses to rotatably support the second projections therein formed in the other of the gyro and supports, with each of the central axes of regions in which the first projections fit in the first recesses being on a same straight line, each of the central axes of regions in which the second projections fit in the second recesses being on a same straight line, said two lines passing through the vertex at the lower end of the metal die, and the line connecting the central axes of the first projections and the line connecting the central axes of the second projections being set at an angle to each other in a horizontal plane, and said metal die having a central axis and being non-rotatable about said central axis.