. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ce E, during thisperiod, acting simplv to swing the connections, //, H, upon their centers, as shown by thedotted lines, but producing no perceptible movement of the blank-holder, while the cranks,K, K, and their connections being in the same straight line, which is the line of thrust,the moving parts are relieved of all strain, thus avoiding undue wear, and making thefull power of the machine available at this time
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ce E, during thisperiod, acting simplv to swing the connections, //, H, upon their centers, as shown by thedotted lines, but producing no perceptible movement of the blank-holder, while the cranks,K, K, and their connections being in the same straight line, which is the line of thrust,the moving parts are relieved of all strain, thus avoiding undue wear, and making thefull power of the machine available at this time, just when it is needed for the object in making the piece, E, so heavy is that it may act as a counterbalance for theother moving parts. In operation, the blank, which has previously been punched or trimmedto the desired size and shape, is placed over the die, and the blank-holder then first descendsin advance of the punch until it rests upon the blank, and exerts a heavj pressure all aroundits outer edge. The punch then descends and forces the middle portion of the blank intothe die, drawing the metal out from between the face of the die and blank-holder, which. Fig. 6.—Toggle press. Elevation. 668 PRESSES, FORGING.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
