Patent GB-1434992-A (GB)
Title: Continuous process for catching and binding portions of cloth and a machine therefor
IPC: D06B11/00
Filed: 1973-05-09
Abstract: 1434992 Finishing fabric edges Y IMURA 9 May 1973 [26 May 1972] 22015/73 Heading D1S A machine for knotting or looping a thread c around caught portions of a fabric edge comprises a movable member I adapted to oscillate forwards and rearwards, a hook lever 2 for looping thread c on front and rear engaging portions a, b, respectively, of the member 1, an oscillatable rod 4 mounted to the rear of the member 1 to adjust the tension of the thread c, a rotatable body 5 mounted to the front of the member 1 to guide the loop onto a caught portion of fabric e, a catching needle 6 mounted on the body 5 so as to be able to catch and release the fabric e, and a needle 8 mounted to the side of the neelle 6 so as to move forward and rearward and up and down for transfer or feed of the fabric. As shown, the member 1 comprises two parallel plates each provided with notches a, b and is movable along two guide grooves 10 in a plate 9. In operation, the thread c from a bobbin 19 is passed a tension adjusting pulley 18, through a hole 4' in the oscillatable rod 4, through a hole 3' in a round-hook member 3 and is hooked onto a hook 2' of the hook member 2. A motor 14 is started to drive a main shaft 11 and an auxiliary shaft 44, the arrangement being such that the shaft 44 rotates once for every two revolutions of the shaft 11. The body 5 is rotated anticlockwise of Fig. 1 by a cranked portion 30 of the shaft 11 and rods 32, 32' and the rod 4 is moved to slacken the thread c. A cam 15 moves the rod 2 in front of the member 1 to hook the thread c onto the hook 2' and lead it downwards whilst the thread abuts on an inclined edge 1' of the member 1 and then engages the notches b, Figs. 2 and 2a (the latter not shown). The member 3 is rotated about a shaft 22 by a cam 20 and moves in front of the member 1 so that the thread c engages the notches a to form a loop, Figs. 3 and 3a (both not shown). The member 1 is advanced along the grooves 10 by rods 13, 13', 13", 13"' and a crank plate 12 on the shaft 11, Fig. 4 (not shown), until the end edge 7' of a catching member 7, carrying the catching needle 6, passes through the space between the two plates of the member 1 to pass the edge 7' through the loop and to hook the rear portion of the loop, Figs. 5 and 5a (both not shown). The needle 8 is advanced by a cam 41 and the member 3 and the rod 2 return to their original positions. The needle 8 is lowered by a cam 40, Fig. 6 (not shown). The body 5 changes its direction of rotation to clockwise and a protrusion 5' thereof hooks the front portion of the thread loop engaging in the notches a and the needle 6 is moved by a cam 39 to catch the fabric, Figs. 7 and 7a (both not shown). Upon continued rotation of the body 5, the rod 4 starts its withdrawal to pull the thread and detach it from the protrusion 5', Figs 8 and 8a (both not shown). The body 5 then starts to rotate anticlockwise and the cams 41, 40 cause the needle 8 to be withdrawn and to ascend. When the rod 4 is withdrawn, an eccentric pin 28 on the crank plate 12 is moved along a quick-return portion 27' of a guide slot 27 in an oscillating plate 24 to pull the thread loop along the periphery of the body 5 so that it loops around the fabric portion caught by the needle 6, Figs. 9 and 9a (both not shown). The thread is looped a second time around the caught fabric portion during the second revolution of the shaft 11, Fig. 10 (not shown). The steps are repeated to form a series of fabric portions f with the thread looped therearound Figs. 11 and 11a (the former not shown).