. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . i-oma crank on tlie outerend of the main shaft,by a peculiar system oflink work, which im-parts, through theblank-holder, a muchmore uniform pressureto the blank than canbe maintained in camdiawing presses. Thestrain arising from thepressure put upon theblank is transferredthrough the straight-ened toggles directly tothe frame of the press,instead of falling onthe main shaft, thusrelieving entirely thebearings from
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . i-oma crank on tlie outerend of the main shaft,by a peculiar system oflink work, which im-parts, through theblank-holder, a muchmore uniform pressureto the blank than canbe maintained in camdiawing presses. Thestrain arising from thepressure put upon theblank is transferredthrough the straight-ened toggles directly tothe frame of the press,instead of falling onthe main shaft, thusrelieving entirely thebearings from all fric-tion and wear due tothe blank holding. Bet-ter and smoother work,with fewer wasters,greater durability, andless consumption ofpower, are the princi-pal advantages gainedthrough this togglemovement. ill DlGSSGS 01 tlliS tvpe made by the E. W. Bliss Co., of Brooklyn, N. Y., the main frame of the usual sizes ismade of a single casting. The main shaft is of forged steel, with a crank s otted out tooperate the plunger. This plunger is guided on the inside of the blank-holder slide andconnected to the crank by a pitman with steel adjusting screw, provided with right and. Fi&. 1.—Toggle drawing press. 666 PRESSES. DRAWING. left-hand ratchet collars for quickly adjusting same. The adjustment of the blank-holderis made by means of four steel screws. In the larger sizes, power is communicated to the back shaft through apowerful fIictionclutch, which, in con-nection with the au-tomatic brake, placesthe movements of thepress entirely underthe control of the op-erator, so that thepress can be stoppedand started instantlyat any point of thestioke. Fig. 1 shows oneof the smaller sizes ofpress made by the Bliss Co. Thispress is adapted foropeniting double-ac-tion dies in the manu-facture of brass, tin,and other sheet-metalshells not exceeding3^ in. in diameter orll in. in depth. Thisincludes a large vari-ety of lamp and burn-er work, tin boxesand covers. Manufacturers ofmetal g
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
