TAILIEUCHUNG - Five Hundred and Seven Mechanical Movements Episode 5

Tham khảo tài liệu 'five hundred and seven mechanical movements episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | J Í Mechanical Movements. ị 35 il 9. Reciprocating rectilinear motion of the double rack gives a continuous rotary the bar carrying the oblong endless rack motion to the center gear. The teeth on produced by the uniform rotary motion of the rack act upon those of the two semi-cir-the pinion working alternately above and below the rack. The shaft of the pinion moves up and down in and is guided by the slotted bar. cular toothed sectors and the spur-gears attached to the sectors operate upon the center gear. The two stops on the rack shown by dotted lines are caught by the curved piece on the center gear and lead the toothed sectors alternately into gear with the double rack. 120. Each jaw is attached to one of the I two segments one of which has teeth outside and the other teeth inside. On turning the shaft carrying the two pinions one of which gears with one and the other with the j linear motion of the bow the stnng of which passes around the pulley on the spindle carrying the drill producing alternating rotary motion of the drill. other segment the jaws are brought together with great force. 121. Alternating rectilinear motion of the rod attached to the disk-wheel produces an intermittent rotary motion of the cog-wheel by means of the click attached to the disk- wheel. This motion which Is reversible by throwing over the click is used for the feed of planing machines and other tools. 124. Fiddle drill. Reciprocating rccti- I2J. A modification of the motion shown ĩn 122 but of a more complex character. 126. A bell-crank lever used for changing the direction of any force. 122. The rotation of the two spur-gears with crank-wrists attached produces a va- 127. Motion used in air-pumps. On vi-riable akernating traverse of the horizontal b tin the Iever fixed on tbe _same shaft bar. 123. Intended as a substitute for the crank. Reciprocating rectilinear motion of with the spur-gear reciprocating rectilinear motion is imparted to the racks on each side which are attached

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