Patent GB-206963-A (GB)
Title: Improvements in the weaving of damask and kindred fabrics
Filed: 1922-09-08
Abstract: 206,963. Carver, T. A. B. Sept. 8, 1922. Jacquards ; lifting-cords.-In apparatus for weaving damask &c., the shedding-mechanism is grouped in self-contained rows of thread-lifting " actions " which are interchangeable and ad. justable in relation to the warp, all the rows being subject to common lifting-mechanism for the shed and to common control of the twill through twilling mechanism engaging corres. ponding selecting actions in each group. The selecting actions for controlling the individual warps for the production of the pattern and the ground are arranged in groups in multiples of the twills generally in use. Each selecting por. tion is provided with a ground lifter and a pattern lifter, which alternatively control the thread according to whether it is to be a ground or a pattern thread. The selecting actions are controlled by electromagnets from a readerframe. As shown in Fig. 1, the selecting actions are arranged adjacently over the warps in groups R of forty, the actions being arranged in the direction of the warp and the groups of actions extending across the warp. Pairs of patterncontrolled twilling-bars Q for controlling the twill of the ground, e.g. 5-leaf twill, and the twill of the pattern, e.g. 8-leaf twill, are arranged so that each ground twilling-bar and each pattern twilling-bar of a pair control one selecting action in each group of actions. A selecting action for controlling a single warp thread in the manner of a double-lift jacquard is shown in Fig. 2. The heald for the warp thread A is attached through a coupling D to a common lifter E with projections E<1> slidable in two pattern selectors F<1>, F<2> having armatures G', G<2>, each having a projection G‹, which is normally held by a spring above a projection on the lower end of a ground lifter H' but is adapted, upon the energization of an electromagnet J, to be moved above a projection on the end of a pattern lifter H<1>. The lifters H', H' have shoulders at their upper ends adapted to rest on projections O of lift-control bars O<1>, O<2>, which are normally held in their uppermost positions by springs P and are depressed as required by the twilling-bars Q. Each group of selecting actions is provided with a pair of oppositely vertically-reciprocating common lifting-bars M carrying a pair of hooks L corresponding to each pair of hooks K on the pattern and ground lifters H', H<2>. A slight horizontal movement is also given to the bars M so that their hooks L engage the corresponding hooks K of the lifters which are in a raised position as determined by the twilling-bars Q. The corresponding lifter is then raised by the upward motion of the bar M and lifts the pattern selector or not according to whether the armature projection G‹ is in engagement with the lifter. The electromagnets J are controlled by a pattern X, Fig. 1, having conducting and non-conducting parts through a reader frame having a row of feelers W connected by flexible conductors Y enabling any feeler to be connected to any one or more electromagnets of the selecting actions. In a modified form of selecting action, the twilling-bars Q, Fig. 3, act on the pattern and ground lifters H<1>, H<2>, the armature G being carried on a lift-control bar O<3> having projections movable in slots in the pattern selectors F<1>, F<2>, which have hooks at their upper ends for engagement by the common lifting-bar M. In this form, the lifters move only through a range sufficient to give engaging action between the selectors and the bar M instead of through the whole lifting-range. In a further modification, the armature G, Fig. 4, of each selecting action is pivoted at G' to the frame and carries a pin G‹ which moves a rocker O<4> pivoted to the lift-control bar O<3> to one side or the other when the bar O<3> is moved downwardly by the reciprocating member M. When the bar O<3> is urged upwardly again by the spring P, it is allowed to rise or not as determined by the twilling-bar Q then in register with the upper end of the rocker. Instead of mounting the groups of selecting actions adjacently over the warps, they may be arranged high above the warps, the usual jacquard harness being employed.