GB461349A - Improvements in or relating to automatic speed control means for spinning frames - Google Patents

Abstract

461,349. Variable - speed drive for ring spinning - frames. JACKSON, L. MELLERSH-. (Reeves, P. B., and Brooks, H. E.) June 14, 1935, No. 17247. [Class 120 (ii)] Ring spinning-frames for building parallel wind or warp bobbins are driven at a speed which increases step by step to a maximum which is maintained for a determined period and then reduced step by step to the initial minimum, by mechanism controlled by an oscillating member from the ring rail so as to move an element of the variable-speed gear in opposite directions to increase and decrease the speed. The driving-mechanism comprises relatively movable cone discs 10, 11, 24, 25, Fig. 1, and a V-section belt 27, the discs 24, 25 being mounted under constraint of a spring 26 on the main shaft 28 of the machine, and the discs 10, 11 on a driving-shaft. The disc 10 is movable to vary the transmission ratio by means of levers 17 oscillated about a pivot 18 as determined by a nut 21 on a screw 22, which is rotated first in one direction, then maintained stationary, and rotated in the reverse direction by ratchet gearing. The screw 22 is geared to a shaft 44 which is driven through one or the other of two ratchet wheels 47, 63, Fig. 3, and clutches 52, 59. The ratchet wheels 47, 63 are operated by a pawl 36 on a shaft 35 carried in an arm 34 of a bracket 31, which is oscillated by a link 29 from the building-motion in accordance with the reciprocations of the ring or spindle rail. The clutches 52,59 are operated to connect and disconnect the ratchet wheels 47, 63 by forks controlled by a rod 135, Fig. 1, operated by a lever 139 and adjustable stops 143, 144, which are mounted on a rod 142 projecting from the lever 139 and are engaged by a block 145 on the lever 17. The pawl 36 is turned about the shaft 35 to engage one or other of the ratchet wheels 47, 63 by engagement of a projection 42 with a stop 87, which is advanced within the path of the oscillation of the pawl by an incline 112 which is gradually raised for this purpose. The incline 112 is carried by a screw 103 engaged by a wheel 99 which is rotated by pawl gear 118, 119 carried by the arm 34. The arrangement is such that initially clutch 59 is out of gear and the pawl 36 engaged with the wheel 47 so that the shaft 44 and shaft 22 are rotated step by step to operate the lever 17 and increase the speed. After about a quarter of the bobbin has been wound, the movement of the rod 135 due to the engagement of the stop 143 disconnects the clutch 52 so that the wheel 47 moves idly and no motion is imparted to the shafts 44, 22. When about three-quarters of the bobbin has been wound, the pawl 36 is reversed by the incline 112 and the shafts 44, 22 are rotated step by step so that the speed is reduced until the bobbin is fully wound, whereupon the movement of the rod 135 due to the engagement of the stop 144 reconnects the clutch 52 and then disconnects the clutch 59. When the ring rail is lowered for doffing the additional movement of the link 29 moves the arm 34 so that a projection 41 is engaged by a stop and the pawl 36 is returned for engagement with the wheel 47, and a finger 132 engages a latch 129 and releases the wheel 99 which is thereupon returned to its initial position by a spring 95, which is wound up during the rotation imparted by the pawl gear 118, 119 during the normal operation.