tailieunhanh - Five Hundred and Seven Mechanical Movements - North, Dug_4

Tham khảo tài liệu 'five hundred and seven mechanical movements - north, dug_4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http t M EC HA NICAL Mo VEM ENTS. 37 128. A continuous rotary motion of the bars move toward perpendicular positions shaft carrying the three wipers produces a and force the lower disk down. The top reciprocating rectilinear motion of the rec- disk must be firmly secured in a stationary tangular frame. The shaft must revolve in . position eicept as to its revolution. the direction of theJOTOW for the parts to be Ị 133. A simple press motion is given in the position represente . 1 tjlr0Ug J1C hand-crank on the pinion-shaft 129. Chinese windlass. This embraces the pinion communicating motion to the the same principles as the micrometer screw tootl .ed sector which acts upon the platen III. The movement of the pulley in by means of the rod which connects it there-every revolution of the windlass is equal to with. half the difference betw een the larger and smaller circumferences of the windlass barrel. 130. Shears for cutting iron plates etc. The jaws are opened by the weight of the long arm of the upper one and closed by the rotation of the cam. . 134. Uniform circular motion into rectilinear by means of a rope or band which is wound once or more times around the drum. 135. Modification of the triangular eccen- trie 91 used on the steam engine in the . Paris Mint. The circular disk behind car lies the triangular tappet -which communi- 131. On rotating the disk carrying the cates an alternate rectilinear motion to the crank-pin working in the slotted arm reci- j valve-rod. The valve is at rest at the com-procating rectilinear motion is imparted to pletion of each stroke for an instant and is the rack at the bottom by the vibration of pushed quickly across the steam-ports to the toothed sector. i the end of the next. 132. This is a motion which has been 136. A cam-wheel of which a side view used in presses to produce the necessary is shown has its rim formed into teeth or pressure upon the platen. .