The invention relates to a machine for the processing of foodstuffs or for the preparation of liquid or pasty pharmaceutical and chemical products, with a bowl, through the bowl bottom of which there leads a motor shaft, protruding perpendicularly into the bowl, of a motor arranged underneath the bowl, and with a shaft seal sealing off the motor shaft vacuum-tightly from the bowl bottom.A cap-shaped seal support is pushed onto the free end of the motor shaft and resets underneath the fitted bowl on a shoulder of the motor shaft and engages at a clear distance labyrinth-like with a lower peripheral cap rim over a stationary housing ring enclosing the motor shaft. The seal support is pushed over and contacts an O-ring which lies in an annular groove of the motor shaft. In the upper section of the seal support, a V-ring is loosely inserted as a sealing ring, and encloses the shaft passage in the bowl bottom with an upper V-member. With fitted bowl, the V-ring is seated under radial prestress vacuum-tightly on the motor shaft and bears with its upper V-member under axial stress against the underside of the bowl bottom.