Patent GB-273016-A (GB)
Title: Improvements in and connected with paper or like winding or reeling machines
IPC: B65H23/032
Filed: 1926-03-26
Abstract: 273,016. Moufang, F. March 26, 1826. Feeding webs. - In webreeling machines wherein the transverse registering of the web is effected by the axial displacement of the delivering reel, a relay controlled by the edge of the web controls the operation of rotating friction discs which co-operate with a disc secured to a screwthreaded spindle adapted to produce displacement oi the delivering reel. The spindle 5, Fig. 2 , of the delivering reel 2 is mounted in bearings 6 and is driven by pinions 7, 8 and a belt drive 9 from the main shaft The left-hand bearing 6, together with the spindle 5, is movable to the right or left by a screw-threaded spindle 10 carrying a disc 11 which can be engaged by either of two constantly rotating friction discs 12, 13, Fig. 3, driven by the belt 9 and mounted on pivoted arms 14, 15 provided with armatures 18, 19 co-operating with electromagnets 20, 21 at their lower ends. The excitation of the electromagnets is controlled by a device comprising a guide a<1> carrying two slidably adjustable nozzles a which are set adjacent to the edges of the web, the nozzles being connected to a vacuum chamber b<1> by pipes b. The chamber b<1> is exhausted by a continuous acting pump b<2>. U-shaped branches C from the pipes b are open to the atmosphere and contain mercury upon which float iron discs c<3> adapted to close the requisite relay circuit when the deviation of the web causes a port a<2> in either of the nozzles to be covered and consequently increases the vacuum on that side, causing the mercury to rise until the disc c<3> comes against a contact c<4> in the relay circuit. The attraction of the armature puts the corresponding rotating disc 12 or 13 into contact with the disc 11 which turns in the direction necessary to restore the web into its central position. A valve d is provided in each of the pipes b to regulate the vacuum system. In a modification, Fig. 5, the friction discs k<12> co-operating with the disc 11 are provided with coaxial ratchet wheels k<6> adapted to be actuated by pawls k<5> at the ends of pivoted arms k<3>, the other ends of which rest upon rollers k<2> at the upper ends of rods supported by floats k on the surface of the mercury in the open ends of U-tubes h, so that when a port a<2> is uncovered by the edge of the web the mercury rises in the open end of one of the U- tubes and puts the pawl into engagement with its ratchet wheel. The pawls are oscillated continuously by connecting them to levers m<1> which are pivoted on the shafts of the discs k<12> and are engaged at their lower ends by a constantly rotating cam m. The pawls are normally held disengaged from the ratchet wheels by adjusting the positions of the suction nozzles to give the necessary vacuum in the U-tubes. In another modification the relay actions are controlled by an electric switch mounted at each edge of the web, each switch comprising an upper and lower metal plate between which the web passes, the upper plate being provided with an aperture containing a metal ball adapted to ride upon the edge of the web, so that if the web deviates the ball touches the lower plate and completes the relay circuit.