GB276047A - An improved process and apparatus for covering cylindrical rollers with rubber - Google Patents

Abstract

276,047. Gray, C. H. May 5, 1926. Moulding rubber coverings for rollers.-Permanent or rigid rollers such as rollers used in machines for paper-making are wound round helically with a rubber strip, the adjacent edges of the strip touching each other or being sufficiently close that vulcanizing will produce a continuous even covering. The strip may be progressively extruded and fed to the roller on the same machine. The edges of the strip may be cut. square, or may be bevelled in such a manner that adjacent edges form a scarfe joint. Where two layers of rubber are applied, either or both may be helically wound; and when both are helically wound, the helical windings may be in opposite directions or in the same direction but with the joints of the inner layer covered by the strips of the outer layer. The rubber covering thus applied is preferably vulcanized under water pressure. A machine for extruding and winding the strip comprises bearings 12 for the end shafts 11 of the roller 10 to be covered, and alongside this a carriage 22 running on rails 21 and carrying the rubber extruding device 35. The roller 10 is rotated through suitable gearing by an electric motor 14, and motion is transmitted through a clutch 26 and a reversing and reducing gear 28. to a chain 33 for moving the carriage 22 at the correct speed in relation to the speed of rotation of the roller 10 for the given width of rubber strip. The rubber strip 49 is extruded in a known way from the device 35 by means of an electric motor 36, and is passed over and under a small roller 37, which is pressed against the roller 10 by a spring 41. The pressure of this spring can be adjusted by a hand-wheel 144. The extruding device is mounted on a table 24, which can be angularly adjusted relatively to the carriage 22 by means of a hand-wheel 51 to deliver the rubber strip in a direction conforming with the pitch of the helix on the roller 10. Gas, water, steam, and electricity are supplied where required by conduits 44 - - 47. Specification 260,847, [Class 42 (ii), Fabrics, Treating otherwise &c.], is referred to.