WIRE STRAIGHTENING AND MOLDING FOR RELAYS 



861 



that a multiple head machine would bo rcHiuiicd, a second experimental 

 machine was built. This machin(% V'l^. I, (Unsigned with the driving 

 mechanism and spacing allowances considered ncn-essary for an automatic 

 multiple head straightener, had onl_v one double head capable of straight- 

 ening a single wire. A major change, to be tliscussed later, was rei)lac(^- 

 m(Mit of the five adjustabh" die blocks in each head l)y a pair of opposing 

 die l)lades contoured to provide a wire passage space between them 

 identical to the predetermined path previously forced upon the ^^^rc by 

 the fi\'e die sets. These die blades were retained by a spindle keyed to the 

 drive mechanism. To accommodate the double head featuie, a rotating 

 unit consisting of two spindles coupled together was employed. Much 

 of the remaining experimental work, such as optimum rotational speed 

 of the spindles, the effect of different configurations of the die blade 

 wire path surfaces, rate of ^\ire feed, etc. was performed with, this ma- 

 chine. Except for minor changes it became the prototype for the auto- 

 matic multiple head machines constructed later. 



Straightened Wire Storage 



In contrast to the manual operations needed to assemble the springs 

 and phenol fibre insulators of U- and Y-type relay spring pile-ups, it 

 was planned from the beginning to mold straightened ^\^re into phenolic 

 resin by automatic means so that imit assemblies would be obtained for 



Fig. 1 — Experimental machine with one double head, prototype of 24 and 30 

 double head wire straightening machines. 



