Patent GB-540001-A (GB)
Abstract: 540,001. Knot - tying devices. FIDELITY MACHINE CO. Oct. 24, 1940, No. 15656. Convention date, July 31, 1940. [Class 112] [Also in Group VIII] In a machine drawing a yarn from any one of several supplies, means are provided for knotting the yarn in use to any other one of the supplies and severing it from the previous supply. In the arrangements shown, the supply yarns a ... e pass through holes in a fixed guide 18 and in individual selecting fingers 1 ... 5, and the yarn in use, or running yarn, a<SP>2</SP>, Fig. 12, is connected to a supply yarn a while the ends of the other supply yarns are held in clamping means B. To change the running yarn to the supply c, the corresponding selecting finger 3 is lifted and an arm 180 is swung to carry the yarn portions a<SP>2</SP>, c<SP>2</SP> into a knotter where they are tied together and the yarn a is cut below the knot. The knotter K includes a housing 130 which carries bearings 131, 132, Fig. 6, for a vertical shaft 86 and bearings 133, 134 for the horizontal bill shaft 135, which passes through an opening in the shaft 86 and is operated therefrom by gears 137, 138. A movable jaw 141 pivoted at 142 to a bifurcated fixed jaw 139 is provided with a heel 143 and toe 144, which ride on a cam surface 145 formed on the bearing 133 to open and close the bill 140 as it is rotated. Above the bill the knotter includes a gripper or pincher 150, comprising blades 151, 152, and 154, which are apertured to fit on the shaft 86 and to permit oscillatory movement. By the action of swing- ing the finger 3, Fig. 12, the portion c<SP>2</SP> of the selected yarn c<SP>1</SP> and the portion a<SP>2</SP> of the running yarn are carried into the bill 140 and into the open pincher 150. The knotter shaft is then operated to rotate the bill and cause the pincher to move the yarns forward. As the shaft rotates, a loop of the knot is formed about the bill and a lever 121 is rocked to grip the yarn a<SP>2</SP> by its edge 123 against a fixed plate. As the jaws of the bill close on and grip the two yarn portions a<SP>2</SP>, c<SP>2</SP>, the two yarns are severed by shears 210, Fig. 1, actuated by an oscillating member connected to the knotter-actuating lever 175, and the cut ends are drawn through the loop. The pincher then pulls the loop off the bill and makes a tight knot. Each yarn finger 1 ... 5 has a notch 10 to engage the running yarn and a tooth 12 to keep its own yarn clear of the clamp when selected. Gears 14 on the hubs of the fingers 1 ... 5 are brought selectively, by sliding the whole group A of fingers, into alignment with a pinion on a shaft driven from a gear 25, Fig. 1, which also meshes with a sliding rack 27; the pinion is flanked by fixed toothed segments which lock the fingers not selected for operation. Upon vertical movement of the rack the selected finger is operated and swings to the operating position as shown by guide 3 in Fig. 12. The stud 16, Fig. 12, on which the fingers 1 ... 5 pivot is an axial extension of a slide bar which is fitted with a lateral extension carrying a pin 42, Fig. 1, working in a cam slot 45 of a plate 46, pivoted at 47. A spring tends to slide the group A of fingers to the left, so as to retain the finger 1 in position to be operated, by turning the plate 46 in the direction of the arrow Z. The plate 46 is turned in the opposite direction to select the fingers 2 ... 5, by a pattern-device, not shown, acting through a lever connected by link 52 to a lever 53, pivoted at 54 to a fixed part of the machine; a link 55 connects the lever 53 the plate 46. Another lever 60, pivoted at 54, is constantly rocked by an eccentric rod 61, and a third lever 65, pivoted at 54, is connected to the rack 27 by a link 66. A pawl 68. pivoted at 67 to the lever 65, normally bears on a surface 69 of a hold-out cam 70. The cam 70 is also pivoted at 54 and is connected by an arm 71 and a link 73 to the cam plate 46. When the plate 46 is rocked in making a selection, it rocks the cam 70, the surface 69 being moved from beneath the tip of the pawl 68, so that the tip rides down into the path of a shoulder 77, formed on the outer end of a lever 78 secured to the constantly rocking lever 60. With the tip of the pawl 68 lying in the path of movement of the shoulder 77, the effect of the lever 78 rocking in the direction of the arrow x is to rock the lever 65 and to displace the rack 27 and the operating gear in mesh therewith, so that the selected finger is swung upwards to the position of finger 3 in Fig. 12. Specifications 219,313 and 267,459, [both in Class 74 (ii)], are referred to.