| 摘要 |
1,216,551. Friction and toothed gearing; controlling clutches. W. ZINDLER, [trading as LUMOPRINT ZINDLER KG.]. 1 Jan., 1968 [4 Jan., 1967], No. 43/68. Headings F2L and F2Q. In a friction or positive drive for a control apparatus, driven members 5, 57 are peripherally engaged and driven by a continuously rotating driving member 1, recesses 10, 60 in the peripheries of the driven members interrupt drive when they arrive in positions adjacent the driving member, pivoted latches 13, 69 are spring biased to engage recesscorresponding notches 11, 67 in the driven members to stop the latter in their drive interrupted positions, and slipping friction means or, as shown, springs are provided to rotationally bias the driven members in their stopped position, so that on release of the latches peripheral engagement of the driving and driven members is initiated and drive ensues. The driving and driven members are of different diameters thus providing a torque change therebetween. At least one of the members may be serrated or knurled to provide slip-free engagement; or both members may be toothed, sudden impact being avoided by gradually changing tooth height or tooth face slope. The members may be discs or shafts, may be spring pressed together, and may have resilient surfaces. The recesses 10, 60 may be circumferentially offset so that peripheral drive ceases before latch engagement. In operation, on closure of a switch 52 a solenoid 22 withdraws the latch 13. During the resulting rotation of the driven member 5, firstly a cam 72 fast therewith depresses a lever 73 to switch on a light 78 which may include a time delay, and subsequently a cam 71 also fast with the member 5 depresses a lever 53 to switch off the light, and withdraw the latch 69 for rotation of the driven member 57. Due to driven member size difference &c. the member 57 continues to rotate after the member 5 has stopped. The member 57 may be fast with further cam means acting on the switch 52 to provide continuous repetition of the operation until interrupted, as by an additional switch in the solenoid circuit. More than two driven members may be provided, equi-angularly spaced. |
