Tham khảo tài liệu 'five hundred and seven mechanical movements part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Mechanical Movements. 87 349. Another form of parallel ruler The 356 Bohnenberger s machine illustra- arms are jointed in the middle and con- ting the same tendency of rotating bodies nected with an intermediate bar by which 1 This consists of three rings A A A2 means the ends of the ruler as well as the placed one within the other and connected sides are kept parallel. by pivots at right angles to each other. 350. Traverse or to-and-fro motion. The The smallest ring A27 contains the bear- pin in the upper slot being stationary and ings for the axis of a heavy ball B. The the one in the lower slot made to move in ball being set in rapid rotation its axis will the direction of the horizontal dotted line continue in the same direction no matter the lever will by its connection with the bar how the position of the rings may be give to the latter a traversing motion in its altered and the ring A2 which supports guides a a. it will resist a considerable pressure tend- 351. Stamp. Vertical percussive falls de- i to displace it. rived from horizontal rotating shaft. The mutilated toothed pinion acts upon the rack to raise the rod until its teeth leave the rack and allow the rod to fall. 352. Another arrangement of the Chinese windlass illustrated by 129 of this table. 353. A modification of the tilt or trip hammer illustrated by 7X. In this the hammer helve is a lever of the first order. In 74 it is a lever of the third order. 354. A modification of the crank and slot- ted cross-head 93. The cross-head con- w liữc miu KUi tains endless groove in driven by Vcvergeanng from he Engine wr sỊ wpr s u-ce . and by that means the pinion I is carried a uniform velocity of movement of the wrist round the stationary toothed circle G. and or reciprocating-rod. Ị tỊie wheeỊ A is iUS niade to receive a rapid 355. The gyroscope or rotascope an in- rotary motion on its axis. When the frame strument illustrating the tendency of rotat- II and wheel A are in motion the ten-ing bodies to .
