An automatic stuffing machine for food products, which comprises a base framework that supports at least one forming die of the product to be stuffed and a pusher adapted to cause the translation of the formed product through a stuffing tube; the machine has at least one tube changer body that supports at least two stuffing tubes and is actuated to move in order to bring, in each instance, one of the stuffing tubes to a working position, in which it is located substantially at the area of action of the pusher; furthermore elements are provided for removable joining between the forming die and the stuffing tube in the working position which are adapted to pass from an active condition, in which they provide a connection between the forming die and the stuffing tube in the working position, to an inactive condition.

A coextrusion head for a food processing machine includes a feed line section having an inner pipe for conducting in the production direction a food mass to be formed into a strand. An inlet end of the inner pipe is connectable to an outlet of a stuffing machine. A housing extends in the production direction from the feed line section and surrounding the inner pipe. A receiving chamber, formed between the inner pipe and the housing, for a casing material to be applied to the strand. The receiving chamber has a housing inlet for the casing material. The feed line section and the housing are integrally embodied and the coextrusion head further includes a die attachment that has a die opening shaped correspondingly to the inner pipe and that is connected to the housing. A food processing machine having a coextrusion head and a corresponding assembly method are disclosed.