CARD TRANSLATOR FOR NATIONWIDE DIALING 1081 



normally rests on the support blade of the latches. After the pull-up 

 magnet is energized, support by the latches no longer is required and 

 they are operated to move their support blades out from under the toes 

 of the code select bars, so that the combination of bars called for by the 

 code digits may be depressed. After the combination is checked down, 

 the latches return to normal so that they are again in position to support 

 the card stack. The toes of the depressed bars project under the support 

 bars of the latches, thus tending to prevent any of the depressed bars 

 from restoring prematurely. The card support bars are not provided 

 with toe-hke projections and therefore, may be depressed regardless 

 of the position of the latch support blades. This is necessary because the 

 card support bars have to operate after the depressed code select bar 

 combination has been checked down and the latches restored. The 

 selected card then rides the support bars down and controls the ter- 

 minal card velocity within safe limits. 



Transverse alignment of the code select and card support bars within 

 close limits is important to proper coordination of the bars with the tabs 

 of the cards and also to maintain transverse operating clearance between 

 the bar coupling details and the blade Uke extension of the plungers of 

 the associated solenoids. It also is necessary to control the up-stop level 

 of the bars accurately so that the close vertical alignment of the holes 

 in the cards that is required may be assured. These conditions are met 

 by the provision of details that serve both as transverse guides and as 

 up-stops for the bars in groups of twenty each which is consistent with 

 their left and right-hand grouping. Since these combined stop and guide 

 details are needed at both ends of each group, four are provided. They 

 comprise details that are stepped to provide a horizontally disposed sur- 

 face that serves as a common up-stop and a vertically disposed wall 

 that is slotted to form a comblike transverse guide for the solenoid 

 operated bars. The nylon surfaced top of the code select and card sup- 

 port bars engages the bottom surface of , the combined up-stop and comb 

 guide details under the action of the solenoid retractile springs. The 

 comb portion engages the graphitized phenolic linen details that are 

 set into the code select and card support bars near their top at both ends. 



The lowermost position of the solenoid operated bars has to be con- 

 trolled in order to establish their proper operated position with respect 

 to the pole faces of the pulldown magnet and the bars have to be guided 

 endwise so as to maintain a longitudinal operating clearance at the 

 coupling details. This is accomplished by providing stop bars, the top 

 and inside surfaces of which cooperate respectively with horizontally 

 and vertically disposed surfaces of the berylUum copper details that are 



