Blade driving assembly for food processor and food processor incorporating same
A blade driving assembly includes a blade-supporting shaft disposed to rotate parallel to, but laterally offset from, the axis of a food processor's drive outlet. A planetary drive system conveys rotational drive to the blade-supporting shaft, so that the blade-supporting shaft rotates around its own axis, thereby spinning the blade or blades, while at the same time the blade-supporting shaft rotates bodily around the drive-outlet axis, describing a locus, centered on the drive-outlet axis but separated therefrom by a radial distance (d) corresponding to the lateral offset.
1. A blade driving assembly for a food processor comprising:
a base housing an electric motor and having a support surface presenting a drive outlet driveable in rotation about a drive-outlet axis,
a goblet having a base portion containing a drive shaft and adapted, when placed upon the support surface, to pick up the drive from the drive outlet in order to rotate the drive shaft about its longitudinal axis; the longitudinal axis being substantially coincident with the drive outlet axis;
a blade-supporting shaft supported by the base portion and disposed for rotation within the goblet with its longitudinal axis substantially parallel with but laterally offset from the axis of the drive shaft;
a planetary drive system supported by the base portion and adapted to convey rotational drive from the drive shaft to the blade-supporting shaft, such that the blade-supporting shaft is constrained to rotate around its own axis, thereby spinning the blade or blades supported thereby, while at the same time causing the blade-supporting shaft to rotate bodily around the axis of the drive shaft, thereby describing a locus centered on the axis but separated therefrom by a radial distance (d) corresponding to the lateral offset, and reducing formation of vortex patterns otherwise associated with simple rotation of the blade or blades about the drive shaft relative to foodstuffs in the goblet.
2. An assembly according to claim 1 , wherein the planetary drive system comprises a sun gear carried by the drive shaft and a planet gear carried by the blade-supporting shaft.
3. An assembly according to claim 2 , wherein the planet gear runs against a stationary toothed ring formed in a circular recess of a stationary component surrounding the orbit of the planet gear.
4. An assembly according to claim 1 , wherein the axis of the drive shaft coincides with the longitudinal axis of the goblet and the blade-supporting shaft supports one or more blades and wherein a tip of at least one of the blade or blades describes a circular orbit of diameter greater than the lateral offset (d) between the axis of the blade-supporting shaft and the axis of the drive shaft.
5. An assembly according to claim 2 wherein the sun gear rotates with the drive shaft and imparts rotation of the sun gear.