Patent GB-1127236-A (GB)
Title: Improvements in yarn joining apparatus
Inventor: ROBERTS GEOFFREY
IPC: B65H69/02
Filed: 1965-09-30
Abstract: 1,127,236. Piecing-up or splicing yarns. NATIONAL RESEARCH DEVELOPMENT CORP. 23 Sept., 1966 [30 Sept., 1965], No. 41563/65. Heading D1W. In apparatus for jointing yarn, adhesive is automatically dispensed onto one of two pressure plates between which the yarn ends are then held in a predetermined overlapping and crossing relationship, the surplus yarn is removed by trimming members, oscillating motion is applied to one or both plates so that the ends are rolled together and the adhesive mingled therewith, and the plates are then separated to free the jointed yarn. At the commencement of a jointing operation, a multi-cam casting 57 and an arcuate plate 17 with an arcuate rack 23 are positioned approximately 15‹ and 45‹ clockwise of the positions shown. A yarn end 70 is guided against the right hand long edge of projection 3 and on meeting the projecting short and long edges of plates 4 and 5 cause .these plates to rotate and, on riding off short and long projections 7a and 7b, the yarn will be guided into pcsition between a post 51 and trimming cutter 52 on a lower bar,48 (and also between post 51 and spring finger 53a) and between gripper fingers 53 and post 51 on the upper bar 48 so as to lie slantingly across a bed-plate 8 where it is joined in crossing relationship by the other yarn end 71 which has been similarly guided (and secured) from the right hand edge of the projecting short side of plate 5. At this stage, plate 17 is in retracted position clockwise from plate 8 which is in a depressed position due to cam follower 62 lying in a recess 64 of cam 63, Fig. 3, gripper fingers 53 holding the two ends of yarn against posts 51, trimming cutter 52 being open relative to posts 51, and cam follower 46 engaging the lefthand end of the outermost portion of cam 47 the bars 48 being horizontal and parallel. An auxiliary motor (not shown) is .started to drive pinion 24 clockwise until plate 17 reaches the position of Fig. 1 and gearing (not shown) has rotated an adhesive dispensing roller 42 in a container 26 so that a segment 43 transfers a small quantity of adhesive to the resilient surface layer 18 of plate 17, which is thus brought above the crossed yarn ends, and the motor is stopped. A main driving motor (not shown) is then started to actuate cutters 52 which trim excess yarn from the free ends and simultanecusly lift plate 8, into increasing pressure engagement with plate 17. After a period of maximum pressure has passed, bars 48 are lowered, fingers 53 open and disengage from yarn ends and trimming cutters 52 open. A rolling or twisting action is then applied by starting the auxiliary motor which, through electro-mechanical reversing means (not shown) rotates pinion 24 alternately in opposite directions to oscillate plate 17. When the end of arc 65 on cam 63 reaches follower 62, the pressure between plates 8 and 17 is reduced but the oscillatory movement continues in order to complete the joint. The auxiliary motor is stopped, leaving plate 17 in its outermost anticlockwise position, and, when cam recess 64 reaches follower 62, the plate 8 lowers from engagement with plate 17. As shaft 2 approaches completion of one revolution (at which point the main motor is stopped) the cam 47 returns bars 48 to a horizontal position in which a spring 50 will pull them into parallelism. The main motor stops, the auxiliary motor is operated sufficiently to drive pinion 24 anticlockwise to retract plate 17 clockwise from bed-plate 8 and enable jointed yarn to be removed.