A rotating pressure applying apparatus for clamping and pressing a plurality of workpieces. The apparatus includes a rotatable apparatus having a plurality of viselike clamping devices mounted thereon and spaced circumferentially around the rotational axis thereof. Each clamping device is moved into a clamping position by a suitable power device, such as a fluid pressure cylinder. A control structure, such as a cam and switch arrangement, coacts with the rotatable apparatus for causing automatic releasing of the clamping devices at a first location, and for causing automatic clamping of the clamping devices at a second location which is angularly spaced from the first location. A workman can position new workpieces into the apparatus between these two locations.
