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In the left illustration, the bull gear b, driven by drive pinion a, revolves about the large boss c, extending off support
d. The slotted section e, is pivoted about f, which is bored eccentric in boss c. g, a pin that is fixed in bull
gear b, is free to slide in a slot in the back of e. As b revolves, it forces e to revolve about f, but owing
to the eccentric position of f, the pin l makes one half revolution while the gear revolves from h to i, and
the other half while the gear revolves from i to h. k which pins the link m, to the ram n, can be lossened to
position the ram where required. |