Patent GB-190221247-A (GB)
Title: Improvements in and relating to Shuttle Filling or Thread Replenishing, Severing, Failure-detecting, Take-up and Stop or Controlling Mechanism of Looms for Weaving
Inventor: BROOKES ALFRED GEORGE
Filed: 1902-09-30
Granted: 1903-01-08
Abstract: 21,247. Brookes, A. G., [Northrop Loom Co.]. Sept. 30. Loom shuttles, changing bobbins and the like in, automatically; stop-motions; weft, cutting take-up motions; temples. -Relates to weft-replenishing mechanism of the kind described in Specification No. 22,939, A.D. 1894. The hopper F containing the bobbins or weft carriers b is located near one end of the lay, and acts in conjunction with a main weft-fork mechanism at the opposite end of the lay and an auxiliary weft-fork mechanism near the hopper, the whole being arranged so that the main fork is controlled during picks in one direction and the auxiliary forks during picks in the opposite direction, and that the filling- ends, or portions of weft between the hopper and the nearer edge of the cloth, never control the forks. The main weft fork is pivoted to a slide f<x> mounted in a guide f<2> secured to the breast beam A<40>. On failure of weft, when the shuttle travels in one direction, the slide f<x> is actuated by means of the usual weft-fork hammer W, and rocks a shaft d' which carries an arm d engaging with the back end of the slide f<x>; this shaft d' controls the operation of the weft-replenishing apparatus. An arm d' on the shaft d' strikes the upper end of a carrier a<1> supporting the take-up pawl, and causes the take-up mechanism to stop. The shipper lever s is actuated by a knock-off lever n so as to cause the loom to stop, upon outward movement of the slide f<x>, a predetermined number of times in succession, as provided for in the arrangements described in Specification No. 22,939, A.D. 1894. The auxiliary weft fork is carried by a slide g<x>, fitted in a stand g<2> on the breast beam, and engages with the upper end of an arm c<4> secured to a tubular shaft c<x> concentric with the shaft d<1>. This shaft carries an arm c<5>, which acts upon the arm d<2> and thereby throws the take-up motion out of action. The auxiliary fork is formed in two parts, a tine-head g<5> and a body g<7> which is adapted to engage with a weft-fork hammer W<x>; both parta g<5> and g<7> are pivoted upon a pin 15, and are connected by a coiled spring encircling the pin. As long as the weft has not failed, this weft fork is tilted out of the way of the hammer in the usual manner ; if the weft fails, the weft-fork slide g<x> is actuated, and causes a full bobbin or weft carrier to be supplied, but during the backward movement of the slide g<x> a finger g<10> on the stand g<2> strikes a projection g<9> on the head g<5> and tilts the tines of the fork upwards, so that they are out of the way of the filling-end of the pick of weft t<x> next succeeding the replenishing operation. When the slide moves back again, the tines descend but lie at the back of the filling-end and in front of the next pick t ; consequently, the filling-end t<x> cannot control the fork and may be severed at any time. In a modified arrangement, both main and auxiliary weft-fork mechanisms are employed, but the main fork controls the replenishing-mechanism directly, while the auxiliary fork controls the mechanism indirectly through the main woft-fork mechanism. For this purpose, the main weft-fork hammer has a shoulder adapted to engage with a pawl, which is normally held in an inoperative position by a sliding detent mounted on the support of the weft-fork slide. The detent is actuated by means of the auxiliary weft-fork mechanism. Each weftfork mechanism acts independently to throw the take-up motion out of action. When the replenishing-mechanism has been operated a predetermined number, say three, times in succession, in consequence of repeated failure of weft, the loom is stopped automatically by means of an auxiliary knock-off lever actuated by a finger on the main weft-fork mechanism ; this finger is moved into its operative position only when the replenishing- mechanism has been put in operation a predetermined number of times in succession. The filling- enda are promptly severed, after replenishing, by a fixed cutter acting in conjunction with a movable hooked cutter c, the tail end c<4> of which is operated by a spring S<2> connected to and encirclmg a pin c<2> on a slide-bar B carried by a temple stand A. This slide-bar and its connected parts may be of the kind described in Specification No. 15,428, A.D. 1897. On the tail end of the cutter c is a pin c<5> to which the lower end of the spring S<2> is attached, and a notched link h<x> is also connected to the pin c<5> and is normally held firmly by a pawl h<3> and a finger g<10> adjustably secured to the upper part of an arm g<3> on the shaft d<1>. A spring S<x> connects the pin c<5> to the lay. As long as the loom is running, without failure of weft, the motion of the lay towards and from the cloth results only in the alternate relaxation and tension of the spring S<x>, the link h<x> being firmly held. When, however, the shaft d' is rocked on failure of weft, the support or finger g<19> is withdrawn from the link h<x>, which falls away from the pawl h<4>. The next movement of the lay away from the cloth causes the blade c to be moved into the position shown in Fig. 12, or in dotted lines in Fig. 13, the spring S<2> being put in a state of tension, and on the beat-up of the lay, the spring S<2> recoils and actuates the blade, which passes rapidly into the position shown in full lines in Fig. 13, thus severing the weft.