At the other end of the bed plate b, are the pillar blocks f, affording journal bearing to the cam and fly-wheel shaft, a′′ is the tripping cam, which is provided with two toes or cam arms, which meet the tripping piece b′′, and this gives the hammer two strokes in a revolution of the fly-wheel shaft or cam shaft g. The stroke of the hammer may be altered by means of the set-screws c′′, which move the pillar blocks f, so that the cam toes a′′ have contact with the tripping piece b′′ through more or less of the revolution of a′′; the pillar blocks f being retained in their adjusted position by means of the set-screws shown below them in the bed piece b.
By the following means provision is made whereby the face of the hammer may be set out of parallel with that of the anvil block or lower die d′.
Fig. 3049.
[Fig. 3049] is a sectional view through the pillar blocks c, and casting and clamp d. The pillar blocks c c are carried in a semicircular frame a′, hence by unscrewing the bolts b′ and screwing up the pillar block on the other side, the journals are thrown out of parallel, and the plane of motion of the hammershaft is altered so that the face of the upper die does not meet that of the anvil die fair to an amount which may be varied at will by operating the screws b′. The object of this is to enable the forging taper (as in sword blades) with common dies, and thus to save the making of special dies for each degree of taper required.
Similar provision is made in the anvil block which is easier to set, providing the degree of taper is within the limit of its range, of movement, otherwise the hammer also may be set.
Fig. 3050.