Patent GB-708178-A (GB)
Title: Improvements in automatic control means for continuously variable speed devices
Inventor: CARTER MAURICE
IPC: G05G21/00
Filed: 1950-10-24
Abstract: 708,178. Driving arrangements. CARTER GEARS, Ltd., and CROFT, A. Jan.. 21, 1952 [Oct. 24, 1950], No. 25872/50. Class, 120(2) [Also in Groups XXIV and: XXXVII] Means for automatically controlling a continuously variable speed device, such as hydraulic or other gearing, a magneticcoupling,' an electronic motor control system or electric motor, so that the output speed of such device is varied automatically in accordance with two control functions, one of which constitutes a basic speed regulation means and completes one cycle for a given operation and the other of which constitutes a cycle speed regulation means which completes a number of cycles in the same time and is superimposed on the basic speed regulation, comprises a toothed differential gear unit in which all the gears are continuous, associated with pivoted basic and cyclic cam follower levers to actuate a speed control shaft or speed control output member according to the algebraic sum of the movement of the said follower levers. As shown, basic and cyclic cams 2, 3, the 'spindles 63, 64 of which are. connected to. the apparatus to be controlled, e.g. to the ratchet and heart shafts of doubling and spinning frames, actuate follower levers 4, 5, each pivoted at one end 6 and held in engagement with the cams by springs 18, pendant links 9, having runners 8 - engaging in arcuate slots 7 in the follower levers, being pivoted to levers 10 operatively connected to shafts 11, 12 on which are mounted sun gears 13, 14 of a differential having a planet 15 in a carrier 16. Stop means 19, 20 extend laterally from each lever to coact and limit the movement of the cyclic cam lever in accordance with the position of the basic cam lever, and the positions of the link runners 8 in the arcuate slots 7 can be controlled by screws and nuts 21. 22 carrying forks 23, a scale and pointer 24, 25 being provided to facilitate this adjustment and the device being mounted in a case with a transparent window 27 so that such adjustment can be observed Thus whichever cam 2, 3 moves will rotate the differential carrier 16, and the amplitude of this rotation for a given cam movement can be controlled by the position of the runners 8 in the slots 7. A gear 32 on the differential carrier meshes a gear 31, Fig. 1, on a speed control shaft 29, carrying a torsion spring 28, Fig. 3, secured at one end 30 to a stationary part and at the other end to the gear 31, the latter being formed on a sleeve 33 rotatable on the control shaft, and being extended at 35 to carry a'worm 36 meshing a quadrant 37 integral with a plate 38 also rotatable on the control shaft. A starting handle 41 is hinged to a block 42 secured to the shaft and can be engaged in a notch 39 in the plate 38 to transmit movement from the gear 31 &c. to the control shaft, the worm 36 &c. providing means for the angular adjustment of the gear 31 with respect to the control shaft 29. A lever 34 or other member is secured to one end of the shaft 29 and controls the continuously variable speed device, the torsion spring 28 being pre-stressed so that, if the handle 41 is engaged in the notch 39 and the cams 2, 3 removed, the control is moved towards the high speed position. The cyclic cam 3 can be adjusted angularly on its shaft by engaging a peg in holes 3a therein. In a modification, Fig. 4, not shown, the cams 2, 3 engage pivoted levers which themselves engage adjustably positioned rollers on another two levers, pivoted together at a fixed point, and connected at their other ends through universal joints to levers operating the sun gears of the differential.