Patent GB-458687-A (GB)
IPC: D01H1/24
Abstract: 458,687. Variable - speed gearing for spinning - frames &c. ; ratchet gearing. REEVES, P. B., c/o Reeves Pulley Co., Columbus, Indiana, U.S.A. June 22, 1935, Nos. 17996 and 17997. Convention dates, July 14, 1934. [Classes 80 (ii) and 80 (iii)] [See also Group IX] Consists in a control mechanism for a variablespeed transmission and more particularly to a fully automatic mechanical control for a variable-speed transmission for a spinning- frame. The control comprises a unit which, for filling wind cycles, will start the frame at a low speed, gradually increase it to a maximum, continue at this maximum for a period and then gradually reduce to starting speed but, for warp wind cycles will gradually increase the speed to a maximum and continue at such maximum until stopped. The frame is rotated by an electric motor through an expanding- pulley type variable-speed drive, changes in speed being effected by moving the motor relatively to the driven shaft. The motor is mounted on a table provided with a nut engaging a screw-threaded rod adapted to be rotated in one or the other direction in accordance with the position of the ring rail. The framing 10, Fig. 1, has spindles 11 and ring rail 12, the spindles being rotated by a shaft 13, Fig. 2, and the ring rail reciprocated by a shaft 14, arm 15 and link 16. The unit consists of a base 17 having an upstanding portion 18, a slideway 19, Fig. 2, in which accommodates a table 20, Figs. 1, 2, carrying the electric motor 21 which drives the shaft 13 through a shaft 24, expanding pulleys 25, 26, and belt 29. The table has a nut 23 engaged by a threaded rod 22 and carries a lug 76 adapted to engage adjustable stops 74, 75 on a rod 68. An arm 30, Fig. 1, through linkage 31 ... 33 oscillates a shaft 34 which extends into a casing 37, Figs. 1, 4, and carries an arm 38, Figs. 3, 4, in the outer end of which is a spindle 40 carrying a pawl having two arms 42, 43 adapted to engage oppositely directed teeth of ratchet wheels 55, 61 respectively. Loosely mounted on shaft 34 is a long sleeve 49 to which is splined at its lower end a clutch member 50. Another clutch member 57 is splined to the hub of the ratchet wheel 55, which is loose on the sleeve. Each clutch member has teeth adapted to engage teeth in a sprocket member 53 also loose on the sleeve 49, to which the ratchet wheel 61 is fixed. A post 64 provides a support for fulcra of levers 65, 69 engaging at one end the clutch members 50, 57 and at the other end elongated slots in the rod 68 shown also in Fig. 1. A spring 72 tends to hold both clutches in engagement. The sprocket 53 is connected by a chain 79 to a sprocket on a shaft 77 connected to the screwed rod 22, Fig. 1. A squared end 80 at the upper end of the shaft accommodates an adjusting handle 81. Keyed to spindle 40, Figs. 3, 4, are collars 45, 47 provided with fingers 46, 48 respectively adapted to engage stops 84, 85 adjustable along a slideway 83. After correct adjustment of the stops 74, 75, Fig. 1, the table 20 is brought by handle 81 to its upper or starting position, and pawl arm 42 is thrown into engagement with wheel 55, the finger 48 contacting with stop 85. Upon starting the motor, arm 38 being oscillated rotates ratchet 55 through pawl 42 and, clutch member 57 being engaged, the sprockets and shaft 22 will be rotated in a direction to produce downward movement of table 20. When this commences, the lug 76 will allow rod 68 to move downwardly under the action of spring 72 until the teeth of clutch member 50 are engaged, but this has no effect on the movement since pawl arm 43 is out of engagement. As the desired maximum speed is approached, lug 76 contacts with stop 74 and depresses rod 68. As the maximum is reached, clutch 57 is disengaged. At this moment, oscillation of arm 38 produces no rotation of the sprocket and the frame continues to be rotated at maximum speed. Owing, however, to the advance of arm 38, finger 46 will be caused by stop 87 ultimately to reverse the pawl, whereupon arm 43 will engage ratchet 61 and, as clutch 50 is in engagement, the sprockets and the shaft 22 will be rotated in the opposite direction to produce upward movement of the table and diminishing rate of rotation of the frame. Later, lug 76 engages stop 75 and clutch 50 is disengaged. At this moment table 20 is back to starting position and the machine is stopped by the operator, who doffs his spindles and returns ring rail 12 to starting position. In doing this, arm 38 is brought back and in passing stop 84 finger 46 engages a cam surface 91 of the stop and is not tilted thereby, but when near the starting position finger 48 strikes stop 85 to throw pawl arm 42 into engagement with wheel 55. For warp winding, stops 84, 85 are removed, and a single stop substituted having an overhanging portion adapted to engage a single finger on the pawl, the pawl arm 43 never engaging the ratchet 61. After completion of winding, the ring rail is moved back to starting position and this causes pawl arm 42 to be held out of engagement with ratchet 55 thus enabling the table 20 to be lowered by the handle applied at 80. In a modification, Fig. 7, intended for use where a gang of spinning frames is driven collectively from a single power source through line shafting, the frames are driven from a shaft 101 connected by expanding pulleys 103, 106 with a shaft 105, the disc 106 having a cylindrical surface adapted to be driven by a belt 120 with striking gear 121. A yoke 108 connected to movable discs 107 of pulley 106 has two pins 109 engaged by two levers 110 pivoted at 111, the other ends of the levers having slots to engage pins 116 on a nut 117 adapted to be traversed by a screw 119. The ring-rail reciprocating means is connected by a link 124 to a tubular element 127 which, through an off-set portion 128, rotates within a casing 169 an arm corresponding to arm 38 in Figs. 3, 4. Oscillation of this arm through pawls, ratchets, and clutches rotates a shaft 135 and through bevel gearing 156, 157 the screw 119. The clutches are actuated by a rod 171 carrying stops 172, 173 adapted to be engaged by a bracket 175 on the lever 110. The mechanism within casing 169 is described with reference to Fig. 8 (not shown). Specification 425,483, [Group IX], is referred to.