Apparatus for the control of die heads of presses with movable dies

In presses with movable dies, especially screwmaking machines consisting, as principal constructional elements, of a die head mounted on a shaft, two dies in the die head, and a pair of rollers on the die head,

• the use of controlling apparatus comprising a pivot shaft, a controlling fork mounted for pivotal movement on said shaft, a portion of said fork being adapted for rolling contact with the rollers on the die head, the sections of said portion nearest to the pivot shaft being circular arcs of the same radius, the centre point of each arc lying on the pivotal axis of the controlling fork, while those sections of the said fork which are farther from the pivot shaft than the said circular sections, and which are in use in contact with the rollers, are in the form of curves the distance of which from the said pivotal axis lightly increases in the direction of the working movement of the rollers, and between the circular arc sections and the sections deviating from a circular arc shape there are connecting transitional sections.