Patent GB-1306232-A (GB)
IPC: D01H4/24
Filed: 1970-02-25
Abstract: 1306232 Break spinning; end catchers; stop motions TOYODA JIDOSHOKKI SEISAKUSHO KK 25 Feb 1970 [25 Feb 1969 15 March 1969] 9146/70 Heading DID Yarn breakage in a break-spinning machine is repaired by unwinding the end of the yarn from the package 6, drawing it across a predetermined span (position I), guiding the spanned portion into the exit path of the yarn from the spinning unit (position II), cutting the end off the yarn, introducing the cut end into the exit passage 7 of the spinning unit until it reaches the spinning chamber thereof, whereafter normal spinning operation can result. Normal spinning operation (Figs. 3 and 4 not shown). Sliver is fed by rollers (I) over combing roller (2) into sub-atmospheric pressure spinning chamber (3). Spun yarn is withdrawn through exit 7, over rollers 8, 9 and wound onto drum-driven package 6. Upon yarn breakage, as detected by detector 17, the drive to the sliver feed rollers (1) is interrupted and a signal lamp 20 is lit. A travelling automatic yarn tending unit 21 (Fig. 1) detects this illuminated lamp 20 and then its detector (30) cuts its drive motor (or engages a low speed drive) and applies a brake so as to stop opposite the faulty spinning unit. The brake is operated by the detector 30 moving an operating switch (LS1) into the path of a lever (33) which is oscillated as the tending unit 21 passes each spinning unit. Operation of the tending unit 21. (1) Cleaning the spinning chamber (3), (see Fig. 3, 4 and 5 not shown). The spinning chamber (3) is opened by moving an arm (38) towards the two part casing 11, 12 of the chamber so that it releases the catch (13, 14) and pivots the front of the chamber open. The belt drive to the combing roller (2) is thereby disengaged. A nozzle (54) is then lowered into the chamber to blow compressed air against the chamber walls and suck the fibre-laden air away. Alternatively, the nozzle (54) can have a device for peeling the fibres from the chamber walls (Fig. 7). One nozzle is then retracted and the two parts 11, 12 of the spinning chamber casing are closed and opening arm 38 is retracted. The combining roller (2) and the spinning chamber recommence rotation. (2) Repositioning broken yarn end. A suction nozzle carrying a package unwinding roller 65 is raised towards the package 6 and the package 6 is lifted from its driving drum 10. When the nozzle is below the package 6, the package is lowered onto the roller 65, and the yarn end is unwound and sucked into the nozzle 64, as shown. This nozzle 64 has a longitudinal slit in it (Fig. 11 not shown) and therefore the yarn eventually emerges from this slit to extend in the position I as shown. A yarn guide and cutter 78 is then moved forward to move the yarn through guides 80 and (82 Fig. 12 not shown) to position II between rollers 70. The yarn is then cut by a cutter 79 on the end of the arm. (3) Feeding of yarn end to spinning chamber is performed by rollers 70 and air duct 87 (Fig. 14 not shown). The yarn detector then causes sliver feed rollers (1) to feed fibre to the spinning chamber and spinning recommences. The unwinding roller 65 and rollers 70 are then driven in the opposite direction (by roll 72 bearing against roll 8) to rewind the yarn onto the package. The nozzle 64, unwinding roller 65 and yarn guide and cutter 78 are then quickly retracted and the package 6 drops onto drum 10. The electric circuits and the arrangement of electromagnetic clutches and brakes for performing the above operations are illustrated (Figs. 9, 10, 17 and 18 not shown).