Patent GB-527941-A (GB)
Title: Improvements in or relating to timing mechanisms
IPC: G05G15/04
Filed: 1939-04-24
Abstract: 527,941. Doffing mechanism for spinning-machines. WILLENS, R. A. A. April 24, 1939, No. 12252. [Class 120 (ii)] [Also in Group XXVI] A timing mechanism comprises. a plurality of units each consisting of driving, driven and intermediate elements geared together, said units being connected in series, and means being provided to restrict the rotation of the intermediate elements and last of the driver elements of the series to any desired amount so as to permit any predetermined amount of rotation of the first driving element 11. In one form, compound toothed wheels 15, 18, and 21, 24, Fig. 4, are freely mounted on arms 17, 23, free on a central shaft 9. A hollow driving shaft 11 has a gear 14 engaging the gear 15. Gears 19, 20, of a compound wheel free on the shaft 9 engage the gears 18, 21. The gear 24 engages a gear 25 free on the shaft 9 and fixed to an arm 26. The gears are contained in a casing consisting of side plates 12, 13, fixed to the shaft 9 and three annuli 28, 29, 30. A bar 27 passing through the casing engages the arms 17, 23, 26 which may also engage projections 33, 34, 35 on the annuli 28, 29, 30. The annuli have circumferentially spaced holes, 40, 41, 42 and the relative angular displacement of the projections 33, 34, 35 can be adjusted and the parts registered by a bar 32 passing through the holes. The outer surface of the annuli 28, 29, 30 may be graduated to facilitate this adjustment. Upon rotation of the driver 11 motion will be given to the gears, and the arms 17, 23 will planetate until they abut the projections when no further relative motion of the gears can occur. The casing with the gears and shafts 9, 11, will then rotate solidly. If the direction of rotation is reversed a similar delay action occurs before the shaft 9 is driven. In Figs. 1 and 2 the timing gear is shown applied to apparatus for spinning artificial silk in which filaments 1 produced in a cabinet 2 are collected on packages 5. When the packages are full the filaments 1 are broken by a projection 7 on a chain 6 carried by a shaft 59. The latter is driven in one direction only from the shaft 9 through gears 56, 58 and free wheel 61, or a chain 62 and free wheel 64. The shaft 11 of the timing mechanism 8 is driven from the shaft 47 in one direction by gears 43, 48 and in the opposite direction by chain gearing 44 according to the position of a clutch member 51. The latter is actuated periodically by a member 67 on the shaft 59. In operation after the filaments 1 have been cut the direction of rotation of the shaft 11 is reversed. During the time which elapses before the shaft 9 again rotates a fresh set of packages 5 are assembled and wound. In a modification of the timing device for uni-direction rotation, the shaft 11, Fig. 7 (not shown) is driven by a ratchet clutch under spring action and the arms 17, 23, 26, each have a spring tending to force them towards the bar 27. In another modification each unit of the timing mechanism comprises sun wheels 109, 110, Fig. 8, and a sleeve 106 carrying planet bevel pinions 108. Each sun wheel 109 is integral with the preceding sleeve 106. The sun wheels may be locked to the casing or permitted to rotate one revolution by a key 118. The number of revolutions made by the driver 11 before rotation of the shaft 9 occurs depends upon the number of the sun wheels 110 which are held locked.