374,613. Variable-speed belt gearing. DRONSFIELD, J., Atlas Works, Oldham. May 29, 1931, No. 15707. [Class 80 (ii).] Relates to an automatic belt or like shifter for use in apparatus for grinding or trueing leather-covered or other rollers used in textile and other trades, for example as described in Specifications 7095/01 and 249,299, [both in Class 60, Grinding or abrading &c.], in which the traverse of a grinder at different speeds in each direction is required. The grinder at each end of its travel moves a rod b axially, the rod carrying stops b2, b3 which move one, for example a4, of a pair of loose brackets a4, a5, slidable on the rod b and on a rod a3 moving with a rod a which carries the belt-forks a1. The bracket a5 is temporarily held by a pawl e so that a spring lying between the brackets is compressed. On further movement of the bracket a4 its inclined edge a4x engages an incline on the pawl e and the bracket a5 is released and is thrust forward rapidly by the spring bearing upon stirrups a2 secured to the rods a, a3 and thus moving the belt on to the pulley step f1. In the opposite direction of motion of the grinder, the bracket a4 is temporarily held by a second pawl e1 which is similarly released to allow the spring to thrust the belt on to the pulley step f2.
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