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10 12 14 16 



WELD POSITIONS 



Fig. 6 — Contact length before and after adjusting hardness of rubber feed rolls 

 and omitting gears between them. 



each head. Fig. 6 shows the results of an early test on feed accuracy. 

 Impro^•ed accuracy was obtained by providing free running tape reels. 

 All portions of the tapes and reels are insulated from each other to 

 prevent loss of weld energy. 



ELECTRICAL FUNCTIONS 



Electrically the welder has 24 separate weld circuits. Each circuit, 

 sho^^^l schematically in Fig. 7, includes a capacitor w^hich is charged 

 through its own thja-atron to a predetermined high voltage maintained 

 by a voltage regulating transformer. The capacitor discharges through 

 a thyratron and a transformer to produce the customary low \-oltage- 

 high current weld energy. The transformers are located under the table 

 near the welding heads. 



The electronic equipment is mounted in cabinets to the right and left 

 of the welder proper, as shown in Fig. 3. The capacitors are located in 

 low cabinets, on either side, together with their solenoid controlled 

 safety short-circuiting system. The cabinet above the welding heads 

 contains control switches and relays. Toggle s^^^tches are provided for 

 cutting off the weld energ}^ for each of the 24 circuits. 



- — VW 



WELD 

 TRANSFORMER 



WELD 

 ELECTRODES 



Fig. 7 — Schematic of weld circuit. 



