Patent GB-466787-A (GB)
Title: Improvements in shuttle changing and loom stopping mechanism
IPC: D03D45/34
Filed: 1935-12-04
Abstract: 466,787. Looms having automatic weftreplenishment. CROMPTON & KNOWLES LOOM WORKS. Dec. 4, 1935, No. 33585. Convention date, March 6. [Classes 142 (i) and 142 (iii)] In a multicolour loom especially wherein some shuttles SS<1> and SS<2> are used less frequently than others CS<1> and CS<2>, a single weft detector or feeler 67 at the magazine side of the loom causes the actuation of automatic shuttle changing mechanism or loom stopping mechanism, accordingly as it indicates substantial exhaustion of weft in one of the shuttles CS<1>, CS<2>, or in one of the shuttles SS<1>, SS<2>. In the latter case, the loom is stopped with the active shuttle SS<1> or SS<2> at the drop box side of the loom. A warp stop motion is used, which is rendered temporarily ineffective whilst the weft detector is acting, and stops the loom upon warp failure &c. with the active shuttle boxed at the magazine side. An indication for shuttle change of a shuttle SS<1> or SS<2> is stored and retained during and after stoppage for hand replenishment of a shuttle CS<1> or CS<2> and the shuttle change is effected when weaving is resumed. Four shuttle boxes 70 to 73 may be used operated from floating lever mechanism and rods 81, 82 connected to cranks on shafts 85, 86, which are rotated under the control of mutilated gear mechanism. Cams 128, 123 on these shafts control the position of a lever 43 and thereby determine whether the feeler 67 shall cause loom stoppage or shuttle change. Shuttle - changing mechanism.-When the shuttles CS<1>, CS<2> are active, the cam 128 is in the position shown in Fig. 2, and a lever 124 controlled thereby is clear of a lever 120, which can thus be rocked by the cam 123 and by means of a cord &c., 47 move the lever 43 to two different positions, accordingly as the shuttle CS<1> or CS<2> is active, the lever 43 guiding one or the other of two hooks 23 into position beneath a stud 41 on a shuttle changing lever 30. The circuit of the weft feeler 67 comprises two branches 156, 157, which are respectively closed by contact screws 154, 155 . on spring- controlled pivoted arms raised and lowered by cams connected to the lever 43, so that when the shuttles SS<1>, SS<2> are active, the feeler circuit passes through a stopping electromagnet 100, but when the shuttles CS<1> or CS<2> are active, passes through a shuttle changing electromagnet 52. When this is energized, its raised core 53, Fig. 13, rocks a trip 54, which rocks one or the other of two latches 39, 40 into position to direct a dagger 38 on a constantly rocking lever 37 into position to engage and rock the lever 30, one or the other of the two hooks 23, 28 being depressed by the stud 41 and by means described, a shuttle from one or the other of two magazines 16, 17 is released or pushed into a space C. The lever 30 also raises a rod 34 carrying an upper weaving box 35 and a lower auxiliary box 36, whereby the shuttle change is effected. The latches 39, 40 are maintained in their actuated positions by toggle springs, but are reset by engagement with a screw when the lever 30 is raised. The latches are supported by a carrier 50 connected by a rod 49 to the lever 43 whereby one or the other is positioned in the same plane as the dagger accordingly as the shuttle CS<1> or CS<2> is active. The feeler of the double prong electric type is pivoted at 61 to a bracket 62 and is provided with a spring-controlled finger 63, which normally holds the detector in a rearward detecting position determined by an adjustable set-screw 65, but allows for forward movement at the time of shuttle change to clear the incoming shuttle &c. Stop motions.-When the shuttle SS<1> or SS<2> is active the cam 128 is, as shown in Fig. 4, so positioned as to rock the lever 124 and cause this to move the lever 120 and the lever 43 to a third and extreme position, whereby the circuit 52 is interrupted and that through the solenoid 100 closed, and also the latches 39, 40 are both moved clear of the vertical plane of the dagger 38. Yielding arrangements described permit the lever 43 to move to this extreme position without damaging the hooks 23, 28. Energizing of the solenoid 100 causes its raised core to raise a link 102 pivoted to a lever 93 into the path of a rocking lever 96, whereby the lever 93 is rocked and through lever mechanism actuates the shipper handle 90 to stop the loom. The link 102 is held raised by a lever, until it is actuated by the lever 96. A spring-controlled lever 105 is connected by a rod 106, an adjustable clip 108 and a spring 109 to the stem of a switch 111, which is closed when the shipper handle is in driving position, but otherwise open. An electric warp stop motion 188 is included in the circuit of the solenoid 100, but this circuit is interrupted at the time the detector acts by a cam-controlled lever 167 coacting with contact plates. However, when warp breakage occurs, the circuit is closed in due course and the link 102 raised into the path of the lever 96, which is actuated by two cams on the bottom shaft. One is adjustable and acts upon operation of the warp stop motion to stop the loom with the active shuttle at the magazine side. The other acts upon operation of the weft feeler to stop the loom with the active shuttle at the drop box side.