tailieunhanh - Five Hundred and Seven Mechanical Movements - North, Dug_5

Tham khảo tài liệu 'five hundred and seven mechanical movements - north, dug_5', 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 Mechanical Movements. 1S9. Another modification of 186. 197. What is called a mangle-rack. 191. Scroll-gears for obtaining a gradually increasing speed. into the endless screw which is arranged between them. The teeth of one wheel only are visible those of the other being on the back or side which is concealed from view. 194. Another mangle-wheel. In this the speed is equal in both directions of motion reciprocating motion to the square frame. The pinion-shaft must be free to rise and fall to pass round the guides at the. ends of the rack. This motion may be modified as follows If the square frame be fixed and the pinion be fixed upon a shaft made with a universal joint the end of the shaft will describe a line similar to that shown in the drawing around the rack. only one circle of teeth being provided on the wheel. With all of these mangle-wheels 190. A screw-clamp. On turning the the pinion-shaft is guided and the pinion handle the screw thrusts upward against the kePt gfar by a grooyẹ in the wheel. The holder which operating as a lever - holds f is made with a universal joint down the piece of wood or other material yhich allows a Portion of il to haye under it on the other side of its ful- bratory niotioa necessary to keep the pinion I in sear. crum. 195. A mode of driving a pair of fecd-I rolls the opposite surfaces of which require to move in the same direction. The two 192. A variety of what is known as the wheeỊs are precisely similar and both gear mangle-wheel. One variety of this was illustrated by 36. In this one the speed varies in every part of a revolution the groove Ờ d in which the pinion-shaft is oacK or slue wnicn IS concealed from view guided as well as the series of teeth being eccentric to the axis of the wheel. ị 196. The pinion B rotates about a fixed axis and gives an irregular vibratory motion 193. Another kind of mangle-wheel with to tbe arm .