Document Kzzo8nbgY2yoV55DmkyEMk86w

FlC 25-37 --This sketch represents a standard pneumatic bench press in combination with a specially developed safeguarding device Operation Piston A, sliding in cylinder B, is connected by means of rod C with punch D Spring E returns piston A to its highest position after the air pressure is released Air enters cylinder B through port F Without the safety device, the foot-operated valve C admits air from the storage tank directly to inlet F With the sensing device installed, the air ad mitted through valve C, now enters port H into the auxiliary small-diameter cylinder / Piston J in cylinder I is directly connected by means of rod K with the "nng" guard L which fits snugly around punch D The air pressure will depress piston J, allowing air to enter main cylinder B through the onfice M in cylinder I Air can enter the main cylinder only under the condition that piston J has passed beyond onfice M Any obstruction between punch D and die N will prevent the nng guard L and its attached piston ] from traveling downward sufficiently to open port M After releasing the pressure, pis ton J is returned to its highest position by spnng O The air in main cylinder B exhausts through port P, by way of inlet F and onfice M, allowing spnng E to return piston A to its ongmal position From American Machinist, McCraw-Htll, Inc Used with permission details in Chapter 33, "Electrical Haz ards ") 2 Starters for all motors including main drive, slide-adjustment, inclining, lubri cation, and auxiliary motors 3 A transformer to step down line voltage to a value not exceeding 120 volts for control circuits, operator controls, relays, and solenoids 4 Control relays for clutch, brake, air blowoff, and auxiliary devices 5 Operator controls, flywheel brake, rotary limit switches, air pressure switches for clutch-brake, counterbalances, and other control items 6 Air valves for clutch, flywheel brake, air blow-off, and auxiliary devices Installation Controls for new machines should be built and installed m accordance with the National' Electrical Code (ASI Standard Cl and NFPA Standard No 70), applicable local codes, and recognized industry standards The puipose of these codes and standards is to safeguard personnel and equipment The machine control panel should contain the main disconnect switch, motor starters. 725