GB189719745A - Improved Electro-magnetic Picking Mechanism for Looms. - Google Patents

Abstract

19,745. Fairweather, W., [Klein, F. E.]. Aug. 27. Magnetic looms; picking-motions.-The shuttle A contains an electromagnet, and a series of electromagnets B', B' are arranged beneath the shuttle race. Suitable contacts and circuits are arranged so that the shuttle acts as the armature of a motor and the magnets B', B<2> as field magnets, or vice versÔ. Arrangements are described for continuous and for alternating currents. If a three-phase current is employed, a short-circuited armature is placed in the shuttle and the contacts are dispensed with. In the arrangement shown in Fig. 5, the shuttle is grooved to pass over pins E, which guide it and form contacts. The dents L of the reed which are opposite the pins have enlargements, as shown in Fig. 6, to prevent the warps from catching on the pins when the shed is being formed. When dressed or twisted warps are used, it is sufficient to round off the tops of the pins. In weaving wire fabrics, the sides of the pins are covered with insulating-material. Cam-pieces H<2> at each end of the lay actuate a commutator in the shuttle to reverse the circuit through the magnet for each right or left hand throw. In weaving with a single shuttle, the magnets B may be extended as far as the position of rest of the shuttle at each end. This arrangement is, however, inapplicable in connection with a change-box mechanism, so the device shown in Fig. 1 has been designed, in which the energy of the incoming shuttle is stored in the spring s and utilized to start the shuttle again. The spring s is held in a state of compression by the trigger w, released by the withdrawal of the bar x from beneath the lever u. The shuttle is kept in contact with the buffer u on the end of the spindle t by a spring catch y, which is released as soon as the spring s has moved the shuttle through a short distance.