Patent GB-880104-A (GB)
Title: Improvements in or relating to fly frame mechanisms
IPC: D01H1/36
Filed: 1957-10-28
Abstract: 880,104. Fly frames. WEST POINT MANUFACTURING CO. Oct. 28, 1957 [Nov. 5, 1956], No. 33605/57. Class 120(2) [Also in Group XXIX] A fly frame has mechanism whereby the bobbin rail and the bobbins are driven at independently variable speeds. The independent speed control may be wholly mechanical and may consist of a separate pair of cones to drive the bobbin rail, the belt for the additional cones being shifted simultaneously with a conventional cone belt. Several hydraulic driving arrangements are described. In one, Fig. 8, two distinct hydraulic variable speed drives are provided. A pump 206 is driven from the main driving pulley 70 of the machine and is controlled by a disc cam 260 intermittently rotated by electrical means in response to movements of the tumbler shaft 114 of the builder motion. The varying output of the pump 206 passes to a hydraulic motor 212 which drives one element of the compound or differential gear 94 from which is taken the drive to the bobbins. Another pump 234 also driven from the pulley 70 is controlled by a disc cam 284 mounted on the same shaft as the cam 260. The output of this pump is transmitted through a reversing valve 240, electrically operated from the tumbler shaft 114, to a motor 246 that drives the bobbin rail. Instead of two pumps, a single pump may be used and the fluid from it is passed through one motor before the other with a cam-controlled throttle valve 322, Fig. 16, permitting variable amounts of the fluid to by-pass the motor 246. The control of the pump and throttle valve from the builder motion may be mechanical or electrical. In one mechanical form, Fig. 16, periodic rotation of the tumbler shaft 114 is transmitted to the winding shaft 124 and by a gear 126 to a rack 128 that rotates, through gearing, a cam shaft 312 carrying a cam 310 controlling a pump 306 and a cam 326 controlling the variable throttle valve 322. The variable output of the pump 306 is transmitted initially to the motor 212, which drives one element of the differential 94, and then through the reversing valve 240 to the motor 246 driving the bobbin rail traverse mechanism. A conduit 346 constitutes a by-pass round the motor 246 and carries the throttle valve 324 so that a reduced fluid flow passes through the motor 246 according to the varying positions of the throttle valve 324. The reversing valve 240 is actuated by the builder motion through a rigid link 364. A supercharge pump may be provided to apply working pressure to both sides of the pump 306 and motors 212 and 246 when the frame is at rest. An auxiliary circuit including a valve 368 is provided to facilitate kinking of the slivers above the flyers for doffing. A circuit including a valve 370 permits movement of the bobbin rail when the machine is otherwise stationary, as for doffing, so that winding may be initiated with a full layer of slivers. If desired, a more completely hydraulic drive arrangement may be provided with a hydraulic motor to replace the driving pulley 70 and another motor replacing the differential gear 94. Specification 880,105 is referred to.