Patent GB-190216203-A (GB)
Title: Improvements in Knot-Tying Implements
Inventor: COLMAN HOWARD DARLING
Filed: 1902-07-21
Granted: 1902-11-13
Abstract: 16,203. Colman, H. D. July 21. Tying or knotting.-Consists of an improved hand-operated implement adapted to tie a weaver's knot. Its use in connection with warping- mechanism is referred to. The implement is strapped to the hand by means of the lower part of the frame (not shown), and is actuated by a thumb-lever D. The operation is briefly as follows:-One of the threads is wound on the spindle B, and the finger G then passes between the strands thus laid on the spindle, and loops them together as shown in Fig. 14. The second thread is then laid in the jaw of the finger G, which moves towards the spindle B, at the same time gripping this thread. The threads are then stripped off the spindle and finger, the grip of the jaws producing enough resistance to tighten the knot. The spindle B is turned by a segmental gear C', fixed on a shaft C and fitted with locking- faces C<3>, C<4>, to engage with corresponding faces B<14> on the spindle. The lever D is loosely mounted on the shaft C, and carries a cam segment D<2> connected by a pin and slot with the segment C'. The cam D<2> operates a thread-controlling arm D<7> pivoted at D<10>, and is so shaped that the arm D' is first rapidly depressed from its position in Figs. 11 and 4 to form a loop in the thread between the arms A<5>, B<12>, is then gradually raised to allow this loop to be wound up on the spindle B, and finally rises quickly to its first position. Owing to the lost-motion connection between the cam D' and segment C', the arm D<7> receives its rapid downward movement before any movement is imparted to the segment C'. The spindle B has a central slot B<3> for the passage of the finger G, and a slot at right-angles thereto to accommodate the shearing and clamping blade B<6>. Fig. 11 shows the starting position with the thread laid across the arms A<5>, B<12>, and in the open jaw B<6>. After the depression of the arm D' described above, the jaw B<6> is closed by a pin C' on the segment C<2>, and the spindle then receives one and a quarter turns, stopping in the position shown in Fig. 14 with the jaw B<6> held closed by the segment B<15>. The finger G, which now comes into operation, forms part of a spindle G<2> mounted in an arm F (shown in plan in Fig. 3) secured to the shaft C. The spindle is rotated, as the finger G passes through the slot B<3>, by means of the pinion F<3> engaging teeth on a fixed segment, locking- surfaces E<3>, F<4> being provided. The movable shearing and clamping blade G<4> is pivoted on an eccentric pin G'‹ of the spindle G<2>, and has a tail pin G<7> engaging a circular slot G<8>, Fig. 4, in the arm F. The jaw G<4> opens when the pin G<7> enters the radial part G<9> of the slot G<8>. The small backward movement of the lever D which brings the parts to their final position is limited by the engagement with the fixed shoulder A<7>, of the nose C<6> of a locking-lever C<5> pivoted on the segment C<2>. The thread is laid helically on the spindle B, owing to the vertical movement of the guide B<12> produced by a cam B<9> in the lower end of the spindle.