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    • 4. 发明专利
    • Improvements in Wefting Mechanism for Looms for Weaving.
    • GB189729984A
    • 1898-10-22
    • GB189729984D
    • 1897-12-18
    • MACDONALD DAVID JOHNSTON
    • MACDONALD DAVID JOHNSTON
    • 29,984. MacDonald, D. J. Dec. 18. Shuttleless looms.-The weft is inserted half-way through the shed in loop form by a weft rod or needle G, and is taken the remainder of the distance by a hook rod L which advances to meet the rod G. The rods G, L are mounted upon sliding bars F , K, which are guided by pins F , K on the lay, and are connected together by an endless cord J, passing over pulleys J on the lay and fixed to a bracket F on the bar F . The bar F is moved in one direction by a collar E on a sliding bar E engaging with the bracket F, and in the other direction by a spring lever M' acting upon the same bracket. The bar E is connected by a cord D to a pulley B' on a spindle on the lay, and the spindle is driven by another pulley B, over which passes a cord C having its ends fixed to the frame of the loom. The hook rod L is jointed at L to the sliding bar K, and is freed from the weft loop by a roller L , or, according to the Provisional Specification, by a separate lever on the bar K. A selvage shuttle N is mounted in a cradle P, carried by an arm of a rocking shaft, and inserts a thread through the weft loop. In a modification, the shuttle is operated by an endless chain passing over pulleys and attached to the lay. The Provisional Specification states also that the looped or double thread may be twisted, after it has been inserted into the shed, by rotating the hook bar in its bearings by spur or rack gearing.
    • 9. 发明专利
    • Improvements in and connected with Wefting Mechanism for Looms for Weaving.
    • GB189907763A
    • 1900-02-17
    • GB189907763D
    • 1899-04-13
    • MACDONALD DAVID JOHNSTON
    • MACDONALD DAVID JOHNSTON
    • 7763. MacDonald, D. J. April 13. Shuttleless looms.-The weft is inserted in looped form into the shed from a stationary bobbin or roll by means of a needle D , Fig. 2, and hook F, carried by bars D , E , which are moved in opposite directions by an endless cord E passing over pulleys E', E and connected on opposite sides to brackets on the bars. The bar D is operated from another bar C , connected at its end by a cord C to a pulley B , which is driven by a smaller pulley B on the same axis and a cord C attached at its ends to the frame of the loom. The return motion is given by a spring lever F . The loop of weft is traversed at the selvage by an oscillating shuttle G, Figs. 3 and 4, operated by pins J , J on a carrier, which is held in a case K, Fig. 7, and driven by bevel and spur gearing K , K , K and a pin L' from a slotted plate L on the breast beam L . A vertical needle M, made D-shaped near the point, is reciprocated by a cam-bar M to prevent the outer thread of the loop from being improperly acted upon by the shuttle. The shuttle is provided with an adjustable spring finger H to regulate the tension of the selvage thread, and this finger can be turned up, as shown in Fig. 4, to allow the spool G to be taken out of, or put into, the shuttle. The hook F is released from the loop by a small roller N , Fig. 2, acting upon a projection N on its pivoted end. The slack of weft is taken up and its tension regulated by passing it over a guide-bar P , Fig. 10, through the eye Q of a sliding block Q , and through another block S sliding upon a rail S' on the lay A. This improvement is of advantage in weaving narrow fabrics. The block Q is moved up and down by a cam slot R, and is connected by a cord R to a weighted lever P , so that, when the slack is being taken up, this lever is allowed to press upon the weft passing over the bar P .