Indexing wedge drive for cold tube reducing mills and the like

B - Operations – Transporting – 21 – B

Patent

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80/12, 205/31

B21B 21/00 (2006.01)

Patent

CA 1044180

ABSTRACT OF THE DISCLOSURE The invention is directed to a wedge actuating drive for reciprocating cold reducing tube mills. The wedge drive is driven in common with the main crank which reciprocates the roll carriage, so as to be synchronized therewith. Upper and lower roll positioning wedges are arranged to be cyclicly inserted in and withdrawn from roll closing positions, by means of eccentric drive shaft means associated with each of the wedges, one above and one below the pass line for the workpieces. Indexing drive means is provided for the eccentric shaft means, whereby during continuous rotation of the main drive shaft for the system, the eccentric drive shaft means for the wedges are actuated intermittently, so that wedge actuation occurs, as desired, only during the periods when the crank- driven roll carriage nears the end extremities of its recip- rocating stroke. The use of an indexing drive means, rather than more conventional cam and toggle means, provides significantly greater long-term reliability in the operation of the roll positioning wedges, and enables significant reductions to be achieved in the construction cost of the equipment. At the same time, significantly higher operating speeds may be obtained.

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