Patent GB-484804-A (GB)
Title: Electrical colour selecting device for weaving looms having automatic weft replenishment
IPC: D03D45/20
Filed: 1936-11-10
Abstract: 484,804. Electric control systems. SCHWABE, K. Nov. 10, 1936, No. 30656. [Class 40 (i)] [Also in Group IX] In electric colour-selecting devices for looms having automatic weft replenishment, and employing shuttles embodying weft feelers F, in addition to a contact for closing a weft feeler circuit activating the replenishing mechanism, some at least of the shuttles have additional contacts, such as 44, Fig. 7, for closing other auxiliary circuits whereby bobbin magazine controlling devices are actuated for positioning under the transfer hammer a new bobbin corresponding to that in the exhausted shuttle. Operating the transferrer-When the shuttle in that box of the drop boxes which is in line with the picker is substantially exhausted, an electric circuit is completed from an earthed plate 20 through a plate 5, a feeler F, a plate 18 a metal rail 24, a current collector 25, an electromagnet 22, a source of current R.T. and an interrupter U back to earth, whereby bobbin exchange is operated. The interrupter is mounted on the crank-shaft &c., and determines the time at which the magnet is excited. Moreover the raised armature of this excited magnet may move an earthed blade spring 31 into engagement with a contact 30, thus closing a circuit through the magnet independent of that through the feeler, whereby current still continues to flow through the magnet, whilst permitted to do so by the interrupter U, although the circuit through the feeler F has been broken owing to the spent shuttle having been picked from its box. An arrangement is described wherein the duration of this circuit is independently controlled by a second interrupter, and a further modification is described wherein this independent circuit is actuated by a different current and one of a higher tension. The energized magnet may switch on a three phase motor which effects the change of bobbin. The rail 24 is mounted on a strip of insulating tape secured to the shuttle box. Multicompartment magazines controlling.- Various arrangements are described for actuating or controlling these by the auxiliary circuits referred to above. Thus a twocompartment magazine may normally be spring held in position with bobbins A<1> in position beneath the transferrer and be moved by a motor M to position bobbins B<1> beneath the transferrer. The shuttles B carrying bobbins similar to the bobbins B<1> are provided with additional contacts 44 co-operating with contacts 45 connected to contacts 47 on a sliding rail additional to the rail 24 for the circuit controlling the transferrer. When a shuttle B is spent, an additional circuit is completed through a current collector 48, and an additional magnet 49 is energized. Springs 54, 57 are thereby caused to close contacts 53, 56, and the motor M, driven by a source, R.S.T., is rotated, the motor driving the magazine by gearing 60, 59. Stops 61, 62 determine the two positions of the magazine. In a modification, the energized magnet 49 moves a hook connected to an arm on the magazine into the path of a vertically reciprocated knife, whereby the magazine can be turned against spring action. In another modification, the traps of the four compartments of a magazine are controlled by four respective electromagnets, and the shuttles are provided with four different types of additional contacts for energizing the circuits controlling these electromagnets. In another arrangement, a four colour magazine is used comprising outer and inner bobbin holders 102, 104, Fig. 11 driven by gearing from respective motors M<1>, M<2>. The holders are normally held in the central position shown by spring catches 107, 108. The various shuttles A, B, C, D are provided with different arrangements of contacts, the shuttles A having the ordinary contact 5 only, whilst the shuttles B, C have additional but differently-positioned contact strips 111, 112, the shuttles D having an additional double contact strip 113. The strips 111-113 co-operate with insulated blade springs 114, 115 connected to sliding rails 116, 117 and they are connected to the feeler F which is in electric connection with the sliding rail 23. When any shuttle is spent, the sliding rail 23 is electrically connected through the feeler F and contact 5 to the earthed contact 20, and when the shuttle B or C is spent, the rail 116 or 117 is also electrically connected to the contact 20, whilst when the shuttle D is spent, both rails 116, 117 are electrically connected to the contact 20. The circuit from the rail 23 controls the transferrer and is completed to earth through a source R, T, and interrupter U<1>. Current from the source RT passes to the rails 116, 117 through a switch W, and an interrupter is inserted in two phases of the source R. S. T. driving the motors M<1>, M<2>. The switch W determines which motor is actuated and also its direction of rotation, the corresponding bobbin holder being thus moved to position under the transferrer a bobbin corresponding to that in the spent shuttle. Various constructions of the switch W are described. In one, two magnets combined with a lever or throw in switch are used, in another two magnetically operated switches are employed. A modification is described wherein two magnets control the engagement with vertically reciprocated bars of hooks, which operate the magazine.