Japanese Patent JPS6211558

U

An upper plate driving system is employed on a surface lapping machine. By this invention, poor performance and work-piece breakage can be avoided by providing a smooth connection between the upper plate and lower plate during operation. The driving system includes a cylindrical driver vertically mounted on typically the lower plate, the driver having a plurality of driver slots defined around its periphery at regular intervals and defining outer ends that flare outwardly to receive a corresponding plurality of lock arms mounted on the upper plate. Thus the upper plate can be raised and lowered into and out of connection wtih the driver slots of the driver member. By this invention, the lock arms are defined into two groups. Each lock arm is spaced from other lock arms in its group at a phase angle which is an even multiple of the spacing of adjacent driver slots. The rotational spacing between each of the two groups of lock arms is a similar even multiple of driver slot spacings, plus one-half of a pitch angle, such pitch angle equalling the center-to-center spacing of adjacent driver slots.

JP10253085U

January 24, 1987

July 05, 1985

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B24B37/08; B24B37/12; (IPC1-7): B24B37/04

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