Patent GB-239009-A (GB)
Title: Improvements relating to wire tying machines
IPC: B65B13/28
Filed: 1924-07-12
Abstract: 239,009. Gerrard Wire Tying Machines Co., Ltd., (Gerrard, A. J., and Wright, P.). July 12, 1924. Wire strainers for tying wires round boxes, cases, packages, &c. In apparatus of the type which rests on the top of the box &c. and carries a slotted twister rotated on an axis in a plane parallel to the top of the box, the twister is rotated by handoperated means directly connected thereto in the operative position. The deformed end 20, Fig. 13, of the wire, which is of heavy gauge, is placed in a narrow slot 19, Figs. 9 and 10, at the end of a slotted holding post 2 and the wire is then passed through the wide slots 22 and narrow slots 5 in the twisting member 4, then through a slot 21 in the holding post 3, then round the box and up through the slot 17 in the post 2, again through the twisting member and post 3, and the free end is passed through one or more of a number of diametrical slots 16 in a ratchet member 9 and finally under a pin 37. The member 9 is then rotated by a pawl lever 38 so as to tension the wire. In order to equalize the tension on both sides of the wire the bottom of the apparatus which rests on the box is smooth so that it may move over the box during tensioning. In order to maintain the parallelism of the two bights 35, 36 of the wire should the apparatus slew round during tensioning the wires may be held in place by a hooked lever 90 pivoted at 91 and normally resting in raised position against a stop 92. In order to effect the twisting operation the member 4 has ratchet teeth 30, 31, Fig. 4, on opposite sides of the axis of the slot 5, and the lip 32 of the slot constitutes a third tooth. This member is rotated by a pawl 33 mounted between the bifurcated arms 26 of a lever 27, the ends of the arms terminating in slotted collars 25, which embrace the portions 6, 7 of the twisting member. A spring stop-pawl 56 is also provided. At least two throws of the lever are required for one complete rotation of the twister. In order to determine the number of twists and to stop the apparatus with the slots in the collars in alignment with the slot 5 the lever 21 is arranged to co-operate with a rotatably mounted timing disc 41, Figs. 4 and 10. This disc, which is held in position by a spring-pressed ball 99 engaging notches 100, has a number of deep notches and a narrow notch 0. The deep notches permit the passage therethrough of a pin 42 on the lever 27 into a hole 43, but the narrow notch prevents the passage thereof. A pawl 44, which has a slot 54 engaging a pin 55 and is pressed towards the disc by a spring plunger 52, is first pushed forward until its tooth 45 engages the notch 9, by pressing its end 58 by hand. The pin 42 is then opposite the narrow notch 0 and the pawl 33 is out of engagement with the tooth 30. Forward motion of the lever 27 thus results in the pin 50 thereon engaging a shoulder 51 on the pawl 44, which is thus pushed back and by its tooth feeds the disc 41 round one stage. On moving back the lever 27 so that its pin 42 passes into the hole the pawl 33 engages the tooth 30 and the pawl 44 is pushed forward by the lever engaging the shoulder and is thus in a position to feed the disc round on the next forward movement. The forward motion of the lever 27 is determined bv a cut-away projection of the frame. Discs with different number of notches may be used to suit boxes of different sizes and wires of different lengths. The ends of the wire are cut off and pressed down below the upper surface of the twist so as to avoid injury to the operator or to packages or persons handling them during transit. In order that this operation may be effected close to the ends of the twist the sides 72. 74 of the holding posts 2. 3 serve as fixed cutters. The cutting and bending is effected by a pair of inclined cutters 68, 69, Figs. 9 and 13, which are reciprocated by cams 70, 71 formed on journals 64. 63 fixed to a looped hand lever 66, the lever engaging stops 94, 95, Fig. 4, at opposite ends of its stroke. The cutters have gaps 76, 77 so that each cuts only one wire and have bevelled sides 83. 85 so as to bend down the severed ends of the wires, the side 83 increasing the twist and the side 85 untwisting the part 81.