The invention relates to a pureeing unit (1) for an apparatus for processing foodstuffs with at least one knife (31, 32) arranged radially to a rotation axis (2) and with at least one blade (41, 42) arranged radially to the rotation axis (2). The at least one knife (31, 32) and the at least one blade (41, 42) are rotatable about the rotation axis (2).

A clutch matched with a transmission screw rod comprises a left clutch half tooth, a right clutch half tooth, a clutch screw rod and a clutch base, the left clutch half tooth and the right clutch half tooth can slidably move relative to the clutch base; first threads matched with the transmission screw rod are arranged on the right side face of the left clutch half tooth and the left side face of the right clutch half tooth; the clutch screw rod and the transmission screw rod are located in different planes; a second thread and a third thread in opposite directions are arranged on the clutch screw rod; a fourth thread matched with the second thread and a fifth thread matched with the third thread are separately arranged on the left clutch half tooth and the right clutch half tooth.

An operative insert for a device for processing foods and a device for processing foods including such an operative insert, the device having a receptacle for the operative insert that is driven rotationally about an axis of rotation (R), to which receptacle the operative insert can be detachably fastened in a torque-locked manner by a drive interface, wherein the operative insert bears at least one working element, which can be driven rotationally in a working direction by the drive interface and which can be decoupled from the drive interface in regard to the rotational motion by a freewheel when the direction of rotation of the drive interface is reversed.