Patent GB-800582-A (GB)
Title: Improvements in or relating to machines for making pockets for pneumatic tyre covers
IPC: B29D30/30
Filed: 1956-03-08
Abstract: 800,582. Making bands of tyre fabric. DUNLOP RUBBER CO., Ltd. March 8, 1956 [March 25, 1955], No. 7259/56. Class 144 (1). A machine for winding endless pockets or bands of rubberized tyre fabric to a predetermined circumferential length comprises a rotary winding support 2 with at least one angularlyadjustable wing member 4 pivoted thereto with its pivotal axis 6 and its free end 8 parallel to the rotary axis 1 of the support, means being provided to rotate the support through a predetermined angle and to feed fabric to, and hold the fabric on, the support 2 whilst it is rotating. As shown, the support 2 comprises a rectangular table with a roller 5, 6 at each end to which wing members 3, 4 respectively are pivoted, the free ends of the wing members having rollers 7, 8 mounted thereon parallel with the rollers 5, 6, to define the corners of a prismatic winding surface. Angular adjustment of the wing members 3, 4, to adjust the perimeter of the winding surface, is effected by a lead-screw 15 having oppositely screw-threaded ends engaging corresponding nuts 11, 13 mounted on levers 9, 10, respectively, pivoted on the axes of the rollers 5, 6. The lever 10 is fixed to the wing 4 but the lever 9 is connected to the wing 3 by a pneumatic jack 14 whereby the wing 3 can be rapidly collapsed towards the table 2 for removal of a wound band. The table 2 is mounted on a horizontal shaft 50, Fig. 5, supported on a vertical stand 70 and driven through a friction clutch 51, 52, 53, 54 and a chain 64, by a motor 68. Rotation of the shaft 50 is normally prevented, against the clutch, by a solenoid-operated latch 57 engaged in a notch 54a in the clutch-plate 54 which is keyed to the shaft 50. Momentary operation of the solenoid 58 withdraws the latch 57 to permit one complete revolution of the shaft, and thereby the table 2, until the latch re-engages in its notch 54a. The notch 54a is angularly positioned to provide for a rest position of the table 2 at a convenient working inclination as in Fig. 1.. In operation the fabric stock is supplied both from above and below the table, as viewed in Fig. 1, from two stock rolls B mounted on removable stands A and each associated with an interliner take-up roll C which is friction-driven by a retractable roll 36 or 37 driven by a motor 29 or 28. The fabric stock from each roll passes over motor-driven rollers 39, 40 and 41, 42 respectively and loops dependingly around a roller 73 or 75 carried on a pivoted lever arm 72 or 74, lowering or raising of which during feed of the fabric controls the motor 29 or 28 effecting drive of the take-up rolls C and of the feed rolls 39, 40 or 41, 42. The upper fabric strip E then passes over a roller 43 and its free end is looped around a hollow perforated suction roller 45 carried at the end of a lever 44 which is swingable about the axis of the roller 43 into the broken-line operative position shown in Fig. 1. The end of the lower fabric strip E<SP>1</SP> is looped to rest over a bar 24 supported on a bracket 24a adjacent the lower end of the table 2. To wind a two-ply band, the end of the fabric E<SP>1</SP>, cut with the desired bias along MN, is laid on the table 2. The fabric is retained on the table surface by a fixed suction channel p, q which is disposed below a perforated portion of the table surface and is connected via conduits 77, 76, the bore 63 of the shaft 50, and a valve 61, with a vacuum pump, a further suction zone T being providedto hold the end N of the fabric. Suction at the zone T is provided by a rubber or like cup 80, Fig. 7, adjustably disposed below the table surface and connected to the conduit 77. The solenoid 58 is then operated to permit one revolution of the table 2 to wind the fabric around the rollers 5-8, after which the fabric is again torn.along the line MN, the free end of the fabric being rested back over the bar 24 and the ends of the wound band spliced together. The arm 44 is then swung down on to the wound band and the end of the fabric strip E brought to lie on the roller 6 whereupon a stitching roller 17, carried on one end of a bell-crank 17a, Fig. 4. and rotated by chains 25, 26 driven by a motor 27, is swung by means of a pneumatic jack 19 to clamp the fabric end against the wound band on the roller 6. Support for the roller 6 is provided by the end of a bell-crank 21 which is moved to engage the roller ends by a pneumatic jack 20. Rotation of the stitching roller 17, the suction hold on the wound band having been released, causes rotation of the band around the rollers 5-8 with simultaneous stitching thereto of a second ply from the fabric strip E. After the second ply band is completely wound, the fabric strip is torn and folded back over the roller 45, the lever 44 is raised, and the wing 3 collapsed to permit removal of the band. In alternative arrangements, only one wing may be provided, or the surfaces of the table and wings may be concave.