Patent GB-958568-A (GB)
Title: Improved spinning, twisting or like machine
IPC: D01H7/84
Filed: 1960-09-01
Abstract: 958, 568. Centrifugal spinning and twisting machines and collecting bobbins therefrom. E. NEGISHI. Sept. 1,1960 [Sept. 10, 1959 ], No. 30224/60. Headings DID and D1F. In an automatic spinning machine the yarn 8, Fig. 1, passes through a guide tube 3 reciprocating within a spinning tube 11, the yarn being sucked through the tube 3 and blown on to the internal wall of the tube 11 to be wound thereon by centrifugal force. The tube 3 carries a bobbin 6. Whilst the tube 3 is reciprocating it is gradually lowered until it engages against a central member 20', Fig. 7 in a doffing and bobbin replacing device B, Fig. 1,the bobbin 6 then engaging a spring biased ring 20. At this stage a circular knife 16, within the ring 20, cuts the yarn leaving the cut end of the wound yarn trapped between the bobbin 6 and the ring 20; and the cut end of the yarn in the guide tube 3 is trapped between the tube 3 and the central member 20'. The continued rotation of the tube 11 now causes the yarn in the tube 11 to wind on to the bobbin 6. During the winding of the bobbin 6 no further yarn is supplied by the feed rollers 1 and the reciprocating motion of the guide tube 3 ceases. This is achieved by including ratchet driven means between a driving motor for the rollers 1 and the means for reciprocating the tube 3, and the reversing said motor whilst the bobbin 6 is being wound. This means for automatically causing the driving motor to reverse may be controlled by a counting device on the feed rollers 1, or a time actuated device or a switch that is actuated when the guide tube 3 reaches its lowermost position. Broken yarn. Whilst the yarn is being wound from the tube 11, on to the bobbin 6, a feeler 22 rises at a rate that follows, but does not touch, the lowermost end of each successive layer of yarn as it is removed from the tube 11. Should the yarn break, the rising feeler will eventually prod and catch at or near their lower ends the outermost one or two layers incorporating the end of the broken yarn of the coil 32. Since the coil 32 is rotating together with the spinning tube 11, the yarn layers caught by the tip of the relatively non-rotating feeler 22 then becomes wound around the bobbin 6 and the unwinding motion is thereby started again. Removal of wound bobbin and replacement by empty bobbin. An empty bobbin 6a, Fig. 1, is held in a holder 31 by a resilient arm 38. When one winding operation is completed the doffing and bobbin replacing device B is displaced along a shaft 25 and rocked to the position shown in Fig. 3, the device B striking a catch member 39 on the resilient arm 38 to deflect the arm 38 and release the empty bobbin 6a for discharge into a tube 18 of the device B, the ring 20 having been allowed to move downwardly so that the empty bobbin. can enter the tube 18. At the same time the tube 3 is raised and when the yarn cop thereon engages a tube 13, the wound bobbin 6 is forced from the tube 3 and it drops down on to a guideway 26 fixed to the side of the tube 18, and from which it passes to a conveyer 35. Thereafter the device B returns to its vertical position, is moved along the shaft 25 to a position below the tube 11, and an arm 30 is then pivoted upwardly to raise the ring 20 in the tube 18 and force the empty bobbin on to the guide tube 3 where it is held by spring means 7 or by magnetic means. The sequence of operations is then repeated. Stopping spinning and initiating doffing. When the guide tube 3 has reached its lowermost position, its final reciprocating movement causes an associated pawl 130, Fig. 6, to raise a pivoted arm 129 to release a motor reversing switch 127. When the motor reverses, the drive through a free-wheel device 93-96 becomes effective to rotate a doffing wheel 98 and therewith a control wheel 122 having a notch 124 therein. Until the control wheel 122 has made one full revolution, the arm 129 cannot return to a position at which it re-contacts the reversing switch 127. The wheel 122 makes one complete revolution during the period from the start of the winding of the yarn on to the bobbin 6 to the completion of the return of the doffing device B, below the spinning and rewinding device A and the mounting of an empty bobbin on to the guide tube 3. The axial motion of the shaft 25 is caused by a cam 101 on the doffing wheel 98 acting on a lever 112 having a roller 114 engaged between flanges on the shaft 25. The rotary oscillation of the shaft 25 is produced by a projection 135 from the shaft engaging in a helical groove 136.