NEW GENERAL 1>1 Hl'OSK UKLAY 



1037 



Fig. 10 — AF relay with twelve make contacts. 



push, rather than to pull, the \\'ire through the rotating cams. By this 

 means it is expected to get straight wire without producing an appreci- 

 able tuist in it. The Western Electric Company has developed a multiple 

 head wire straightening machine which can be directly associated with 

 the molding press. 



A multiplicit}^ of straightened wires is fed into a molding press where 

 plastic molding is used to hold them in proper location. Molding of wire 

 required that the plastic, fed into the die, avoid any appreciable dis- 

 tortion of the -^ares between unsupported sections. A considerable 

 amount of development work, chiefly by the Western Electric Company 

 engineers, was required to achieve this result. Transfer molding of a 

 thermosetting phenolic plastic has been chosen as the most suitable for 

 producing stable wire spring subassemblies. This is based on the need 

 for stability of the wire positions and because of the ability of the ma- 

 terial to withstand the effects of heat. Fig. 12 shows continuous ladders 

 of molded wire spring sections before cutting to length. 



The molded sections have a number of features of design importance 

 be^'ond liolding the wires in place. These added features are provided by 

 shaping molded sections to make the remainder of the relay simpler. In 

 particular, these features provide registration pins and holes, guides for 



