WIRE STH AKJH'I'KNINC; AX1> MOLDINO FOR RELAYS 



807 



'I'hc (lie lihulcs arc used not (»iily to coii.sc'rN'c space l)iit also to iiiiiiiinizc 

 (lie costs. The hitter is acconii)hsli(>(l l)y making them from inexpensive 

 sheet metal on a puncii press and discarding- them as soon as wear has 

 dc'stroyed their us(>fuln(\ss for wire straightening. I'lilike the indix'idual 

 die blocks used in the previous rotary head straighteners, it is not neces- 

 sary to groove these die blades to direct the flow of wire through the 

 head. There is a slot milled into each spindle to hold the die blades as 

 shown in Fig. (i. The walls of these slots guide the wire and limit its 

 sideways movement in much the same manner as the groo\'es in the 

 indi\-idual die l)locks. The actual thickness of the die l)lade was estab- 

 lished as slightly more than that of the diameter of the largest wire to be 

 straightened for wire spring relay combs. Thus, one slot of uniform width 

 is milled into each spindle allowing interchangeability of spindles regard- 

 less of the diameter of the wire to be straightened. 



Wire in its transit through the die blades is flexed and burnished to 

 the extent required to produce the desired degree of straightness. It is 

 not rotated during the straightening operation but may acquire twist 

 and even a spiral threadlike burnished appearance from rotation of the 

 die blade surfaces. 



Fig. 5 — Straightening nicrhanisin ot Ul douhlc head wire si raigtiicniiig niachiiic. 



