| 摘要 |
PROBLEM TO BE SOLVED: To provide a mechanism, especially a dead beat second mechanism, for driving a jumping element in which energy is reduced and which is correct.SOLUTION: A jumping element 6 is coaxial to a drive wheel 1 which is connected by a spring 8. A drive mechanism comprises a cam 12 which is configured to oscillate a pallet lever 20 by oscillation motion, for releasing the jumping element 6 once for a unit time. The cam 12 and jumping element 6 comprise an additional pivotal arbor, and the drive mechanism further comprises an intermediate train for connecting the drive wheel 1 to the cam 12 in a kinetic state. The pallet lever 20 comprises four individual arms 20a, 20b, 20c, 20d, two arms 20a, 20b out of the four arms form a feeler which is configured to cooperate with the cam 12, and residual two arms 20c, 20d form an escapement arm configured to block and release alternately and continuously the jumping element 6 once for the time unit.SELECTED DRAWING: Figure 1 |
