Patent GB-1127140-A (GB)
Title: Hydraulic control system for traversing the building-rails of a ring spinning or twisting frame, or of a fly- or speed frame
Inventor: SEIDEL FRIEDRICH
IPC: D01H1/36
Filed: 1965-12-30
Abstract: 1,127,140. Hydraulic control circuits. PKM HYDRAULIK KARL-MARX-STADT VEB. Dec.30, 1965, No. 55236/65. Heading F1P. [Also in Division D1] In a hydraulic arrangement for controlling the movement of the rails of a ring frame or speedframe by one or more working pistons or cylinders associated with a pump which can be adjusted to control the speed at which the rails move, (a) the pump is connected with an element which reverses the movement (e. g. an hydraulically actuated multi-way valve), and means (e.g. an electromagnetically actuated multi-way valve) for controlling the means for positioning the reversing- element, the control and positioning means being connected, according to the direction of the stroke of the traverse, by one of two lines each provided with a throttle-valve, and, in parallel therewith, a non-return valve opening in the direction of the positioning means, and (b) the adjusting means for the pump comprises a piston and cylinder connected through lines to a control element (e. g. an electromagnetically actuated multi-way valve) to which an auxiliary pump is connected, each line being provided with a throttle-valve and, in parallel therewith, a non-return valve opening in the direction of the control element. In Fig. 1, the ring rail is moved up and down by the movement of a piston 11 working in a cylinder 10 and connected to the rail by a cord trained over a pulley 7. Each side of the piston is alternately connected to a pump 20 and exhaust 22 via a reversing-valve 18. The connection on the left of the piston is through a valve 23 which is kept open during working by permanent connection to the pump at 26 and which closes when the pressure is cut off to keep the rail in raised position, and either a non-return valve 24, or a pressure-limiting valve 25 arranged in parallel. The valve 18 has actuators which are hydraulically-actuated, and which are connected to one side of a control-valve 29 through an adjustable throttle 30 or 31 or through a one-way valve 32 or 33 in parallel. The other side of the valve 29 is connected to the pump at 35 or to exhaust at 22. The valve 29 is electromagnetically or pneumatically controlled to be reversed when the rail engages upper and lower transmitters 12, 15. The one-way valves provide a passage way when the associated lines are under pressure, and the throttles when the lines are connected to exhaust. At the start, the ring rail is in its uppermost position, the piston 11 lying to the right. The control valve 29 is now actuated to connect the left-hand actuator of the valve 18 to pressure so that the right-hand side of the piston 11 is connected to pressure through lines 16, 19, the left-hand side exhausting through valves 23, 25 and line 36. When the rail contacts transmitter 15, valve 29 is reversed and connects the right-hand actuator of the valve 18 to pressure to reverse the valve whereby the left-hand side of the piston is connected to pressure through line 17 and valves 24 and 23, and the rail is raised. When the rail contacts transmitter 12, the valves 29 and 18 are reversed and the rail descends. Means are provided to change the speed of the rail as it approaches the points of reversal. To this end, the amount of fluid delivered by the pump 20 is changed as an arm 50 moves between stops 51, 52, under the control of transmitters 13, 14 between the reversal transmitters 12, 15. The arm is connected to a piston 38 moving in a cylinder 39 which is connected by lines 40, 41 to one side of a valve 42, of which the other side is connected to an auxiliary pump 44, and, at 45, to exhaust. The lines 40, 41 each include an adjustable throttle 46 or 47 in parallel with a one-way valve 48 or 49. The valve is moved in one direction by a magnet or pneumatically when the rail contacts a transmitter and is reversed by a return spring. During the down-stroke, the rail is accelerated between transmitters 14,15 and de-celerated when the transmitter 15 is reached. The transmitter 14 is inactive on the up-stroke, between 13 and 12 the rail is accelerated, and at 12 it is de-celerated, transmitter 13 being inactive. The rate of movement of the pistons 11 and 38 and of the changeover of the valve 18 are controlled by the rate at which liquid is allowed to escape through the adjustable throttles 25, 30, 31, 46 47; the rate of the up-stroke of the rail can be varied by changing the position of stop 51 or by adjusting a throttle 37 in the return-line to exhaust. Two cylinders may replace the cylinder 39, Fig. 2 (not shown).