抄録
From the calculated motion diagrams of a sewing machine (H-B-1-type), we see that the maximum velocity and the maximum acceleration of the " eye of thread take-up lever " of this machine become 5 m/sec and 680 m/sec2 respectively at 800 r. p. m.. The respective maximum values of the angular velocity and the angular acceleration of the " shuttle " become 140 rad/sec and 13, 000 rad/sec2 at the same speed of rotation.
These calculated results show that some undesirable vibrations may be excited in the machine for these great velocities and accelerations.
Now the calculated value of the acceleration of the " feed-teeth " of the machine becomes small compared with those of other parts, but its time variation becomes discontinuous, and therefore it may induce some impacts and vibrations on the machine.
