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Five Hundred and Seven Mechanical Movements Episode 6

Tham khảo tài liệu 'five hundred and seven mechanical movements episode 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | - Mechanical Movements. 45 164. A knee-lever differing slightly from the toggle-joint shown in 40. It is often used for presses and stamps as a great force can be obtained by it. The action is by raising or lowering the horizontal lever. 165. Circular into rectilinear motion. The waved-wheel or cam on the upright shaft communicates a rectilinear motion to the upright bar through the oscillating rod. 166. The rotation of the disk carrying the crank pin gives a to-and-fro motion to the connecting-rod and the slot allows the rod to remain at rest at the termination of each stroke it has been used in a brick-press in which the connecting-rod draws a mold backward and forward and permits it to rest at the termination of each stroke that the clay may be deposited in it and the brick extracted. 167. A drum or cylinder having an endless ị spiral groove extending all around it one half of the groove having its pitch in one and the other half its pitch in the opposite direction. A stud on a reciprocating recti- linearly moving rod works In the groove and so converts reciprocating into rotary motion. This has been used as a substitute for the crank in a steam engine. J 68. The slotted crank at the left hand of the figure is on the main shaft of an engine and the pitman which connects it with the reciprocating moving power is furnished with a pin which works in the slot of the crank. Intermediate between the first crank and the moving power is a shaft carrying a . second crank of an invariable radius connected with the same pitman. While the first crank moves in a circular orbit the pin at the end of the pitman is compelled to move in an elliptical orbit thereby increasing the leverage of the main crank at those points which are most favorable for the transmission of power. 169. A modification of 168 in which a link is used to connect the pitman with the main crank thereby dispensing with the slot In the said crank. 170. Another form of steam engine governor. Instead of the .