tailieunhanh - Illustrated Sourcebook of Mechanical Components Part 12

Tham khảo tài liệu 'illustrated sourcebook of mechanical components part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Mechanisms 22-71 4 PIN WHEEL. Pallet A is about to unlock escape wheel. Pin will give a push to pallet A while sliding down Impulse surface. As pendulum continues to swing pallet B will stop pin thus locking escape wheel. After pendulum reverses direction and swings toward dead center pallet B releases wheel and receives an impulse from pin. 5 LANTERN WHEEL. Escape wheel is stopped when pin hits plate A of pallet attached to rocking arm. As arm swings to right pin pushes against Impulse surface of plate until pin Is clear. Escape wheel then turns freely until pin Is stopped by plate B of pallet. Arm starts back toward left receiving impulse from pin until latter clears plate. 3 MUDGE S LEVER. As balance wheel swings counterclockwise 1 the ruby pin enters fork of lever and pushes It to the right. The lever releases tooth of escape wheel which starts turning and gives a tiny push 2 to impulse surface of pallet A-This is transmitted to balance wheel through fork and ruby pin. Balance wheel continues rotating counterclockwise 3 while lever swings to right and pallet B stops the escape wheel by engaging tooth. When balance wheel reaches Its hairspring s limit it reverses direction and re-enters fork 4 . Ruby pin pushes lever to left and receives Impulse when escape wheel starts to move. Balance wheel continues clockwise until It reaches opposite limit of its hairspring. Lever continues moving to left until It again stops escape wheel 5 and awaits return of ruby pin. Another view of Mudge s lever is given in 6 . This escapement Is very precise because of the small portion of each half-cycle that escape wheel and balance wheel are in contact. Friction drag is at a minimum. 22-72 7 More Escapement Another selection of these ingenious mechanical components for use in control systems. Federico Strasser 2 DOUBLE RATCHET. Two escape wheels are mounted on a common axis and pinned together so teeth are aligned with a half-pitch distance between them. Drawing shows pendulum in .