MULTIPLE-BAR MECHANISM OF A SHEAR
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Crank 1 rotates about fixed axis D. Link 9 is connected by turning pairs B and C to crank 1 and to link 3 which, in turn, is connected by turning pair A to ram 2 carrying knife a. Ram 2 slides alondg vertical ways b-b. Link 3 is connected by turning pairs E an F to links 4 and 10. Link 10 turns about fixed axis G. Link 4 is connected by turning pair H to rocker arm 5 which turns about fixed axis K.• Suspended by turning pair L from rocker arm 5 is hold-down 6 which turns freely about axis L. When crank 1 rotates counterclockwise, ram 2 with upper knife a travel downward. Hold-down 6 also travels downward. Ram travel ceases when the hold-down reaches knife a. The stock is sheared by raising lower knife b upon further rotation of crank 1. The mechanism for raising the lower knife is not shown.
$892$LW,FD$

Linked items
Mechanisms: Multiple-bar mechanism of a shear
Documents: Lever mechanisms  [Streambook]
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