GB179312A - Improvements in or relating to machines for making pneumatic tyre covers or casings - Google Patents

Abstract

179,312. Dunlop Rubber Co., Ltd., and Macbeth, C. Feb. 3, 1921. Tyres, elastic, special apparatus for making.- In a machine for building-up a tyre, cover on a rotary core, means are provided whereby the angularity of the spinning-down discs during their inward travel is controlled bv the contour of the core. For this purpose, a secondary or driving-disc may be associated with each spinning-down disc and, by gearing or otherwise, a variable velocity-ratio may be maintained between the peripheral speed of the spinning-down disc and the surface-speed of the contacting part of the core. The angle at which the spinning- down disc is first presented to the core may be varied, e.g. by varying the distance between the associated discs. To prevent creasing of the fabric, an air-jet or a mechanical wiper may be arranged in advance of the spinning-down disc. In the construction shown in Fig. 1, the spinning-down disc A is carried by a shaft A<x>, the driving-disc B being mounted on a sleeve B<x> and held by spring-pressure between discs B<1>, B<2> so as to impart a friction drive between the shaft A<x> and disc A. The shaft A<x> is supported in a yoke C which is swivel-muonted in a bracket C<2> reciprocated by the usual slide or carriage. Owing to the two-point contact of the discs A, B with the surface of the, core, the latter are caused to swivel in the bracket C<2> in its forward movement. Fig. 8 shows a modification in which the disc A is of larger diameter than the disc B, the discs being geared together to define the greater peripheral speed of the disc A. An air-jet at D' prevents folding-back of the unattached fabric Z<1>. The angle at which the discs are presented to the core may be varied by altering the eccentricity of the shafts A<x>, Bx.