| 摘要 |
A sure-seal rolling pin assembly of a lapping and polishing machine for substantially eliminating friction between the sure-seal rolling pin assembly and a work carrier and for substantially reducing particle contamination between the sure-seal rolling pin assembly and the work carrier. The lapping and polishing machine has a plurality of gears operatively connected to one another by the work carrier and each gear has a counterbore which has a surface. The sure-seal rolling pin comprises a pin, a plurality of ball bearing units and a torsionally stretchable seal. The pin has a longitudinal axis, a head portion and a body portion connected to the head portion and the head portion has a diameter and an outer surface. The body portion has a lower surface located adjacent the outer surface and is removably inserted into the counterbore of one of the gears. The plurality of ball bearing units are axially retained and concentrically connected to the body portion and are also connected to the surface of the counterbore so as to allow the pin to rotate about the longitudinal axis. The torsionally stretchable seal has a relaxed state and is capable of elastic restorability. The torsionally stretchable seal creates a seal between the pin and the surface of the counterbore while in the relaxed state. The torsionally stretchable seal has an upper face, an inner diameter, and an outer diameter concentrically located around the inner diameter and the inner diameter is connected to the lower surface of the body portion so as to allow the inner diameter to torsionally stretch when dragged by the rotation of the pin about the longitudinal axis. The inner diameter maintains fall contact with the lower surface of the body portion while the pin undergoes rotational movement about the longitudinal axis. The outer diameter is connected to the surface of the counterbore and maintains full stationary contact with the surface of the counterbore while the pin undergoes rotational movement about the longitudinal axis. The torsionally stretchable seal maintains a seal between the pin and the surface of the counterbore while the pin undergoes rotational movement about the longitudinal axis and maintains the seal while the pin returns to the relaxed state.
|
