GB1103066A - Supervision and control of a multiple spindle textile machine - Google Patents

Abstract

1,103,066. Automatic control of yarn treatment. D. FINLAYSON. Aug. 16, 1965 [Aug. 26, 1964], No. 35060/64. Heading G3R. [Also in Division D1] Each spindle of a textile machine e.g. a spinning machine has a number of transducers each producing a potential proportional to a parameter of the yarn (e. g. denier, diameter, turns per unit length or amount of lubricant applied per unit length) and each potential is compared with a standard potential which is set either manually on a calibrated dial or in accordance with the information on a punched card. In accordance with the comparison of the potentials a control or supervisory action on the individual yarn may be initiated. Instead of D. C. potential other electrical quantities such as frequency could be used. In Fig. 1 (not shown) adjustable potentials are set on leads (1, 2, 3) and at each spindle each standard potential is compared by a comparator (C1) with the corresponding potential from a transducer (T1) giving a potential proportional to a yarn parameter at that spindle. An alarm or control device (A1) may be operated in consequence. The comparison of standard and running potentials is continuous. In Fig. 2 (not shown), one set of comparators (C6, C7, C8) is provided and is connected in turn by sequential switches (A5) to the corresponding transducers (T6, T7, T8) and alarm or control devices (A6, A7, A8). The comparison of standard and the running potentials of one particular spindle is, in this case, intermittent. In Fig.3 (not shown), the devices associated with a single spindle are shown. Monitoring yarn size. Yarn Y of cellular acetate filaments or nylon passes through a photo-cell device T1 and a running potential proportional to its diameter produced. If, on comparison with a standard potential, this is found to be unsatisfactory an alarm A1 is actuated. A differentiating network may also be provided to detect small but repetitive variations. Alternatively or additionally the denier may be measured by a capacitance device or pivoted lever. Variation from standard may cause the bobbin to be rejected. Control of lubrication. Lubricant is applied to the yarn by a roller L and the amount applied is tested by measuring the conductivity of the yarn between contacts E1, E2. A comparison is made at C2 with a standard potential and if a difference is found a feeler S1 is moved to change the wrap of yarn on roller L to regulate the application of lubricant. Measuring yarn on bobbin. The yarn is forwarded by a roller F driven at a controllable speed. A resettable transducer counts rotations of the roller from the commencement of a winding and the output potential compared with the standard at C3. When a required length is wound the comparator operates electromagnets RM and BM to stop the traveller and spindle respectively. The yarn is cut and the feed end fed to a waste duct W. In another form a threaded rod is rotated at a speed proportional to the speed of the bobbin and moves via a threaded nut thereon the slide of a potentiometer, a potential from which is lead to the comparator. In a further form a control drum having a stud thereon for each spindle is provided. The drum rotates once in the time taken for the bobbin to be filled and each stud initiates dipping after each revolution. If a fault is corrected at a spindle the associated stud is moved to compensate for the time loss. Monitoring the insertion of twist. The spindle DS is provided with a permanent magnet rotor PR, which produces a potential in a coil T4. This is compared with a standard potential at C4 and if the speed of spindle DS departs from the desired value e.g. due to belt slippage or bearing seizure an alarm A4 is operated. To compensate for changing yarn speed the windings may be revolved at a rate proportional to that of a yarn feedroller. In addition to actuating the alarm A4 the faulty bobbin may be automatically replaced. Doffing and donning. In Fig.4 (not shown), rails (23) are provided above rows of spindles (22) and each carries a donning trolley (25) and a doffing trolley (26). Normally these are located at opposite ends of their respective rail. Each trolley is provided with a grab G (Fig.3) capable of being lowered to engage a bobbin. When a bobbin is almost filled a signal is transmitted to cause the doffing trolley (26) to run to the appropriate spindle. When the bobbin is pulled round the grab is lowered, pushing aside the pivoted yarn guide TG (Fig. 3). The grab grasps the bobbin, lifts it off the spindle and the trolley runs to a position (40) where the bobbin is lowered on to a square base with a central spring pin. The bobbin and base are then raised, conveyed and placed on a moving belt (32). The bobbin on belt (32) move until halted by a stop (33). When say, five bobbins are against the stop a photo-cell device energizes a ram (34) and they are pushed off the belt on to a box form (37) (see also Fig. 5 not shown). After several rows have been pushed on to the box from the box sides are manually or automatically fastened, the box removed and replaced by a further box form. Meanwhile the donning trolley has moved to the empty spindle and lowered an empty bobbin into it. The donning grab is withdrawn causing the spindle and traveller brakes to be released and winding commence. The donning trolley then runs to a position over a moving belt (29) which carries on pegs (30) empty bobbins from a supply (31). The donning grab picks up an empty bobbin and the trolley moves to a position (38) to await further action. Indicating yarn breakage. Guide TG (Fig. 3) may be arranged to move to indicate a broken yarn or filament and to operate an alarm. The bobbin is then manually removed and replaced. Marking the bobbins. The jaws of the doffing grab are provided with means to mark each bobbin e. g. to show its machine number, date and denier. Each bobbin may have a plastic ring on which the information is stamped or the jaws may be inked to print on a paper strip.