Patent GB-1116741-A (GB)
Title: Improvements relating to textile spinning or twisting machines
IPC: F15B11/046
Filed: 1965-07-08
Abstract: 1,116,741. Hydraulic building-motion. BARMAG BARMER MASCHTNENFABRIK A.G. 8 July. 1965 [8 July, 1964], No.29051/65. Heading DID. In winding yarn on to a package using a hydraulically-operated building rail, after the main winding is completed, yarn is wound on to the outside of the package with a large cross over angle. and if desired on to the end of the package sleeve in the form of a bunch, by moving the building rail in an. extensions of the main traversing zone to an external position for the cross-over winding and from the external position to the starting position of the main wind for winding the bunch; during such movement of the rail, a quantity of pressure fluid per unit time is delivered into and out of a working cylinder which is greater than that so delivered during the main winding. The building rail 1 is connected to a rod 4 to rise and fall as a piston 6 reciprocates in a cylinder 5. The reversals of the piston are brought about when a contact element 7 engages end-contacts 8, 9 which move along rotated threaded rods 10, 11 according to a programme which determines the build of the package. Depending upon the condition of a reversing-valve 16, fluid is supplied to one end or the other of the cylinder by a pump 15 through a one-way valve 19 or 20 at which the piston moves being governed by the rate at which fluid is exhausted from the other end of the cylinder. This in turn depends on the setting of throttles 17, 18 and 21 in the exhaust lines. Throttles 17, 18 are independently adjustable but their throughput once adjusted is constant, while the throughput of throttle 21 is changed during part of the traverse stroke so that the speed of that part of the stroke is varied. The throughput of throttle 21 is changed by pressure fluid applied to one side or the other and exhausted from the opposite side. Depending on the condition of a reversing valve 22, one side or the other of the throttle 21 is connected to the pump 15 and the other side to exhaust through a throttle 23 the throughput of which is adjustable but constant once adjusted. As pressure is supplied to one side of the throttle 21, it opens to accelerate the stroke at a rate depending on the rate of exhaust from the other side which is determined by the setting of throttle 23; when pressure is applied to the other side, the throttle closes to retard the stroke at a rate determined by throttle 23. The condition of valve 22 is determined by contacts 12, 13 which precede contacts 8, 9. As the element 7 engages contacts 12 or 13 towards the end of each stroke, the valve 22 is switched to allow the throttle 21 to open; before its miximum through put is achieved, the element engages contact 8 or 9 to reverse the valve 22 and cause it to close. At the final stroke of the traverse, the contact 8 moves to a position where it engages a locking switch whereby the building rail is allowed to fall beyond the normal range of the traverse, and then to be raised to the starting point of the traverse. As the element 7 moves from right to left during the final stroke, it engages contact 12 and to accelerate the traverse; as the element continues to move it engages the contact # which however, having engaged the locking switch, does not now reverse the valve 22, and the throttle 21 accordingly remains open and the maximum amount of fluid is discharged from cylinder 5. This amount exceeds the capacity of the pump 15 to fill the other side of the cylinder, and liquid is delivered from a storage apparatus 24, allowing the downward movement of the nail to take place quickly. In other arrangements, engagement of the locking switch by the contact 8 increases the output of pump 15. By suitably adjusting the programming arrangements, the movement of the rail from its lowest to its starting position can be accelerated, which movement can be combined with a temporary interruption in the movement of the rail for winding a bunch. In another form, Fig. 2, the storage apparatus 24 is dispensed with, and a by-pass 26 is provided across the ends of the cylinder, which by-pass is provided with two oppositely-acting one-way valves or a slide which blocks the bypass. One 27 of the valves, or the slide, is opened by a valve 28 which is connected to the locking switch operated by switches 8, 9 in the final stroke of the traverse. When the locking switch is operated, the valve 28 is switched to connect the operable valve 27 or the slide in the duct 26 to pressure, and open it, so that the two ends of the cylinder are connected and the movement of the piston 6 and of the building rail is accelerated.