Doffer beam lifting mechanism - has a sprung unit to support the brace at the lower setting to reduce drive spindle wear on lifting

摘要

The lifting mechanism for a doffer beam has a lower support spindle rod with a unit to retain the doffer beam when the lifting braces are at their lower setting. A compressible energy store supports the doffer beam, pref. a coil spring. The spring is mounted with an outer tube and a sleeve which slides in it but is held in place. The sleeve slides within the opening formed by a collar at the outer tube and bears against it with a collar from within the outer tube. The doffer beam (11) has a limit stop (41) to work with the sprung unit. The brace has a linked short arm fixed near the sprung unit linked to a long arm (17) at its centre, between the doffer beam (11) and the lower support rod. The long arm is linked to a hub on the lower rod which is moved to and fro by the rotation of the spindle rod. USE/ADVANTAGE - The mechanism is for raising and lowering a doffer beam, such as at a ring spinner, to exchange full bobbins for empty sleeves at a spindle rail. The system gives support at the critical settings where the movement applied leads to excessive wear in the spindle drive systemmm