Patent GB-783029-A (GB)
Title: Web winders
Inventor: NITCHIE CHARLES DURLEY
IPC: B65H18/20
Filed: 1955-09-28
Abstract: 783,029. Winding webs. LANGSTON CO., S. M. Sept. 28, 1955, No. 27581/55. Class 100(1) [Also in Group XXIX] A web winding apparatus of the kind having a pair of parallel supporting rollers and a pressure roller movable upwardly as the roll increases in diameter is provided with hydraulic means for regulating the downward pressure exerted by the pressure roller. As shown, a roll A, Fig. 1 being wound on a shaft 22 is supported on parallel driven rollers 4 and 4<SP>1</SP>, while the pressure roller 6 is mounted in carriages 7 and 7<SP>1</SP> which can move up and down guides 10 and 10<SP>1</SP>. The roller 6 is driven by electric motors 6<SP>1</SP> through V- belt drives. The carriages have gears 8 meshing with racks 8a, 8b and are attached to chains 15 fixed at points X and Y. The chains pass around sprockets 16, 19 mounted on piston rods 12, 13 respectively slidable in cylinders 11, 11<SP>1</SP>. The carriages 7 and roller 6 may be raised or lowered by supplying oil to the appropriate ends of the cylinders from a reservoir 28, Fig. 3, through pumps 30 or 29. The pumps 29, 30 are driven by a motor 31 and deliver oil to a pipe 33, pump 29 being a large volume moderate pressure pump and pump 30 being a small volume high pressure pump. When the pressure in the pipe 33 is insufficient to lift a spring controlled relief valve 35 the oil from both pumps flows through a check valve 39 into a pipe 33a. When the pressure in pipe 33 exceeds the output pressure of the pump the valve 35 is opened to a drain 40, thus rendering pump 29 ineffective. A relief valve 36 permits by-passing of some oil through a drain 41 in the event of an excessive pressure accumulating. The effective piston area in the upper ends if the cylinders 11, 11<SP>1</SP> is approximately a half of that in the lower ends due to the rods 12 being larger than the rods 13. Thus, when equal pressure is applied to the top and bottom of the cylinders the pistons 11a move upwards. A valve 44 controls the pressure in pipe 43 and is controlled either by a manually operated valve 47 or an -automatically actuated valve 48 depending on the setting of a selector valve 46. When both valves 47 and 48 are open the valve 44 is open to the drain 40, thus causing pistons 11a to move down. When either valve 47 or 48 is slightly closed the valve 44 is closed proportionately, thus arresting the pistons 11a. Further closure of the valves 47 or 48 causes upward movement of the pistons 11a to lower the roller 6. The valve 48 is controlled by a cam 49, driven through reduction gearing by a sprocket 51, Fig. 1, engaging one of the chains 15, such that the full travel of the chains rotates the cam 49 once. In operation, the valve 46 is brought into hand control position and the valve 47 adjusted manually to lower the roller 6 into contact with a small roll on the winding shaft 22. The valve 46 is then moved to the automatic position, the cam 49 holding the valve fully closed to apply downward pressure to the roller 6. As the roll diameter increases the roller 6 is forced upwards and the cam 49 is consequently rotated, thus opening valve 48 to effect upward movement of the roller 6 by the pistons 11a.