thereupon two laterally situtated levers 136 which are secured on rotable and displaceable shafts 137 which are mounted in stationary bearings are moved these act as lateral rotary folder the levers 136 are moved from the position shown at 136 in fig3 to the position shown at 136 39 and during this movement they engage under the portions a 6 and b 6 freed again by the openings in the housing raise these portions up and are further pushed inwardly under portions c 6 c 7 the lever 136 then raise the portions c 6 and c 7 to apply these portions over the projecting portion of the mandrel at the same time portion c 3 is also applied against the projecting portion of the mandrel after this portions c 6 and c 7 are securely clamped by the gripper 121 on the projecting portion 101a of the mandrel the revolver now executes another step of rotary motion so that the mandrel 103 previously at station iii now passes through station iv the lateral levers 138 now pivot from the position at 138 in fig3 to the position shown at 138 39 and fold the portions a 6 and b 6 hard against the portions a 4 and b 4 respectively the entire folding operation is now complete if it is necessary to hold.