tailieunhanh - Five Hundred and Seven Mechanical Movements Part 5

Tham khảo tài liệu 'five hundred and seven mechanical movements part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Mechanical Movements. 47 172. A mode of obtaining an egg-shaped elliptical movement. 173. A movement used in silk machinery for the same purpose as that described in 142. On the back of a disk or bevel-gear is secured a screw with a tappet-wheel at one extremity. On each revolution of the disk the tappet-wheel comes in contact with a pin or tappet and thus receives an intermittent rotary movement. A wrist secured to a nut on the screw enters and works in a slotted bar at the end of the rod which guides the silk on the bobbins. Each revolution of the disk varies the length of stroke of the guide-rod as the tappet-wheel on the end of the screw turns the screw with it and the position of the nut on the screw is therefore changed. 174. Carpenters bench-clamp. By pushing the clamp between the jaws they are made to turn on the screws and clamp the sides. 175. A means of giving one complete revolution to the crank of an engine to each stroke of the piston. 176 and 177. Contrivance for uncoupling engines. The wrist which is fixed on one arm of the crank not shown will communicate motion to the arm of the crank which is represented when the ring on the latter has its slot in the position shown in 176. But when the ring is turned to bring the slot in the position shown in 177 the wrist passes through the slot without turning the crank to which said ring is attached. 178. Contrivance for varying the speed of the slide carrying the cutting tool in slotting and shaping machines etc. The drivlng- shaft works through an opening in a fixed disk in which is a circular slot. At the end of the said shaft is a slotted crank. A slide fits in the slot of the crank and in the circular slot and to the outward extremity of ị this slide Is attached the connecting-rod which works the slide carrying the cutting tool. When the driving-shaft rotates the crank is carried round and the slide carrying the end of the connecting-rod is guided by the circular slot which Is placed eccentrically to the

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