GB520451A - Improvements in or relating to mechanism for producing a combined rotary and reciprocating movement and to applications thereof - Google Patents

Abstract

520,451. Sliver-rubbing apparatus. POOL, W. Oct. 22, 1938, No. 30600. [Class 120 (i)] [Also in Group XXIV] A roller 22, Fig. 2, for driving a band, e.g., a rubbing band as used for compacting continuous assemblies of staple fibres in the preparation of textile threads, is given a rotary motion and at 'the same time is reciprocated axially. The ends of the roller have ratchet teeth 23, 24 facing in a direction opposite to that in which the roller is to rotate. Ratchet members 25, 26 of the same diameter as the roller, have teeth facing in the same direction as the roller is to rotate, these members being so arranged that when the roller is in full engagement with one of the ratchet members it is just clear of the other. The members 25, 26 are continuously oscillated by eccentrics 27, 32 arranged 180 degrees out of phase, and which drive discs 29, 33 connected to the members 25, 26 by steel tapes 31, 34. Movement of the member 25, Fig. 3, causes the roller to move to the right and be engaged by the member 26. When the movement of the members 25, 26 is reversed, the roller is moved to the left and is again driven in the same direction by the member 25. The arrangement is such that a onetooth movement of the ratchet members results in a two-tooth movement of the roller 22 which, for a part of its movement, is rotated without reciprocation. If, however, the ratchet members 'are oscillated over the space of half a tooth only, then the whole motion of the roller is one of combined rotation and reciprocation. In Fig. 1, a bundle of continuous filaments 1, with little or no twist, is drawn through a gate 3 by feed rollers 4 and delivered to an air jet 5 and thence propelled to lie above a hair clipper 6. The separated filaments are carried into the cutter 6 by a deflector 7. The forward ends of the fibres reach the point 8 of a permeable support 9 passing round a suction tube 10 perforated at 11. The upper run of the support 9 moves towards the nip of rollers 12, 13 the latter of which together with a roller 14 serving to carry an end- 'less band 15 against which bears an endless band 16 on rollers 17, 18. The rollers 13, 14 and 17, 18 have the movement described above, whereby the groups of filaments which form a continuous assembly which is compacted by the rubbing bands and when it emerges is twisted into a staple fibre 20 by the ring spinning device 21. Specification 484,190 is referred to