| 摘要 |
Transmission device for rotary motion in steps, in particular in the packing machines at high operating speeds, comprising one input shaft (2), a kinematic chain (3, 4, 5, 6, 7, 8) for transmitting the motion to a multiple, or at least double tumbler (9, 109, 209, 10), and cooperating with a maltese cross type wheel (11), the said maltese cross type wheel is dynamically connected to one or more operative parts to be driven (12), and a spider (9, 209) that carries the double tumbler (109, 10) and that cooperates with the maltese cross type wheel (11) in the sense that it prevents the rotation in the dynamically disengaged condition with one or more tumblers. According to the invention, a second spider (21, 121, 221) is associated with the maltese cross (11) that is given oscillating or rotary alternating motion between a position of engagement and a position of disengagement with the maltese cross. <IMAGE> |
