CARD TRANSLATOR FOR NATIONWIDE DIALING 



1083 



:ard support 



DAP, 



OFF NORMAL 

 CONTACT SPRING 



r 



CODE SELECT 



CA'-^D SU'^POPT riA^ 

 _ = ' MAf,\'- T 



Fig. 30 — Top of dynamic unit illustrating off-normal contacts and solenoid 

 arrangement. 



of supporting one-quarter of the weight of a full complement of cards 

 or 25 lb each. Yet the latches have to be fast. This is accomplished 

 largely by providing for ''on center" loading as may be discerned by 

 reference to Fig. 31 keeping in mind that the beryllium copper append 

 ages on the bottom of the code select bars engage the support blades ot 

 the latches virtually directly above the pivot center. Furthermore, a 

 major portion of the moving member is made from magnesium. A spring 

 pileup such as may be seen in Fig. 32, is associated with and is operated 

 by each latch and the translator circuit is so arranged that a translation 

 cannot progress beyond the latch operate point until all four latches have 

 operated. The same is true when the latches are to be restored to normal, 

 that is, the cycle cannot progress further until all four latches are 

 restored. 



The operate time of the latches averages 40 milliseconds, the restoral 

 average being 15 milliseconds. 



SOLENOIDS 



The main problem here was to provide high-speed operation in the 

 presence of a comparatively large non-operated gap and considerable 



