Machine for gathering products such as grass

A machine for gathering products that lie on the ground, comprising:

• a main frame bearing a first lateral gathering device with which a first windrowing device is associated and a second lateral gathering device with which a second windrowing device is associated;
• wherein the main frame further bears a central gathering device with which a third windrowing device is associated;
• and
• wherein the central gathering device and the third windrowing device are configured to be moved relative to the main frame such that the central gathering device and the third windrowing device can be transposed into a first position in which the central gathering device and the third windrowing device are aligned with the first and second gathering devices and windrowing devices and are substantially adjacent to the first and second gathering devices and windrowing devices such that said first, second and central gathering devices are in contact with said products, and into at least a second position in which the central gathering device and the third windrowing device are offset relative to the first and second gathering devices and windrowing devices such that said first and second gathering devices are aligned with each other and in contact with said products but said central gathering device is not into contact with said products.