Patent GB-297811-A (GB)
Title: Machines for making endless bands for use in tyre building
IPC: B29D30/42
Filed: 1928-05-25
Abstract: 297,811. Goodyear Tire & Rubber Co., (Assignees of Maas, E. F., and Templeton, E. G.). Sept. 30, 1927, [Convention date]. Making compound fabrics. - A machine for assembling compound strips, especially bands of fabric and rubber for pneumatic tyre covers, comprises means for conveying a strip or band, for instance of fabric, and means for selectively applying other strips, for instance strips of rubber of various widths, to the band. The fabric in the form of an endless band is conveyed over a table by an endless belt, and the rubber strip is applied by rollers which may be moved into position against the fabric. The machine comprises a table 2, Fig. 1, over which passes an endless belt 3 which carries the endless strip 4 of fabric. The rubber strips are applied by means of feeding units 55. The endless belt 3 is driven by a roller 8 which is driven by a chain from an electric motor 17 through a speed regulating device 16, a clutch 18 operated by a treadle 22 being provided. A sector-shaped plate 40 is pivoted to the frame of the machine at 41, and carries a bolt 42 extending through a a slot 43 in the frame. A scale 44 is provided on the upper surface of the plate 40. An arm 46, carrying at its upper end a roller 48, is also pivoted to the frame at 41, and is normally kept adjacent the table 2 by a spring 49. The arm 46 is moved into the position shown into contact with a stop 45 on the plate 41 by fluid pressure applied to a piston in a cylinder 53. Pressure fluid is conveyed through a flexible hose 54, and controlled by means of a valve 55, Fig. 2. A roller 61, Fig. 1, mounted on a shaft 59 secured to the longer arm of a bell crank 56 is brought up against the lower run of the band 3 and fabric 4 when fluid pressure is applied to a piston in a cylinder 64. The pressure in this cylinder is also controlled by the valve 55. Means for compressing the fabric and rubber strips comprises a roller 67 journaled in the end members 69 of a cross plate 71 which is mounted by means of pins 72, Fig. 2, passing through collars 73 in an arm 65. The latter is pivoted to the frame, and a weight 76 hung from the opposite end of the arm 65 normally holds the roller 67 away from the fabric strip. This end of the arm can however be raised by means of fluid pressure applied to a cylinder 77, admission to which is controlled by the valve 55. As a cushioning device to prevent damage when the weight 76 is allowed to raise the roller 67, a valve 80, Fig. 3, is located in the pipe 79. The valve comprises a spring pressed ball 88 which permits the passage of fluid in one direction when fluid is admitted to the cylinder 77, but which closes against fluid flowing from the cylinder when the valve 55 is opened to exhaust. A restricted passage 86 then allows fluid to pass slowly, thus lowering the weight 76 without shock. Each unit 5 of the feeding apparatus for the rubber strip comprises a rectangular shaft 93, Fig. 1, mounted in a bearing on the frame and supporting a wooden core 94 on which is mounted a roll of rubber strip interwound with liner material as usual. Mounted rotatably on the shaft 93 is an arm 97, Fig. 2, on the free end of which is mounted a shaft 99, squared to fit a wooden core 100, Fig. 1, upon which the liner strip 96 is wound after removal of the rubber strip. An arm 104, Fig. 1, mounted on a shaft 102, carries at its free end a pivotally mounted arm 107 at the two ends of which are mounted rubber covered applying rollers 111. The free end of each arm 97 is pivotally connected to the ccrresponding end of the arm 107 by a bar 110. The arm 107 may be locked in adjusted positions so that either one of the rollers 111 bears on the work by means of spring pressed pins engaging in indentations on the shaft on which it is mounted. An arm 116 secured to the shaft 102 on which the arm 104 is mounted carries a weight 118 which tends to raise the arm, while the shaft 102 may be adjusted and locked in position by means of a hand lever 119 and a pin 121. Friction brakes comprising adjustable straps 127, Fig. 2, engaging pulleys 126 on the shafts 93 control the unwinding of the rolls. In operation, rolls of rubber strip of different width are placed on the shafts 93, Fig. 1, and the strips fed over the shafts 99 and under the rolls 111. One or two turns of each liner 96 are wound upon the cores 100. The plate 40 is set so that a strip of fabric passing around the rollers 8, 9, 48 will produce an endless band of the required size, and the fabric strip positioned. One of the rollers 111 is then adjusted to bear on the fabric band, and the endless belt 3 is then started. The rubber strip is pressed on to the fabric band. After one complete revolution of the latter, the machine is stopped, the application rollers raised by means of the lever 119, and a second strip of fabric is applied over the rubber strip, the roller 67, being raised, the roller 61 lowered, and the roller 48 moved inwardly by release of the fluid pressure to permit this. A second strip of rubber is then applied from the other applying device, and then a third fabric band.