| 摘要 |
<p>1,075,772. Shearing. SIEMAG SIEGENER MASCHINEBAU G.m.b.H. Jan. 20, 1965 [Feb. 5, 1964], No. 2544/65. Heading B3W. In a pendulum-type flying shear an oscillating frame 3 is mounted on eccentrics 1 of a main drive shaft 2. The top blade 3 is rigidly mounted in the frame and the bottom blade 7 moves in guides formed in the frame and is driven by eccentrics 9, Fig. 2 (not shown), on the main shaft. The eccentrics 1 and 9 are displaced by 180 degrees so that the blades travel in opposite directions. In order to match the flying speed of the shear to the speed of the work the amplitude of oscillation of the frame is adjustable by a linkage system comprising a first link 13 pivotally connected to the frame 3 at 12, a second link 16 pivotally attached to the first link at 14 and to a fulcrum point 19. The common pivot of the two links is also connected to the free end of a connecting rod 15 which is driven by an eccentric 17, rotation of which thus produces oscillation of the frame 3. The amplitude of oscillation is varied by moving the fulcrum point 19, by means of a hand wheel 23 along straight guides 21. A scale 24 indicates the setting. Similar linkage is provided on both sides of the machine, and two cams 17 are provided on the shaft 18 which passes across the machine. In a modification, Fig. 3 (not shown), the fulcrum point (19) is itself mounted at the free end of a lever (28) which is pivotally mounted in the machine by a shaft (29) which is rotated by hand or power means, such as a screw and nut acting through a lever, or a worm and quadrant. Miss-cut device.-The drive from the eccentrics 9 to the bottom blade is by a connecting rod which has a pivoted joint intermediate its ends. The miss-cut device 11 permits angular movement between the two parts of the rod so that the bottom blade remains stationary.</p> |
