Patent GB-420098-A (GB)
Title: Improvements in wire tying machines
IPC: B65B13/28
Filed: 1933-05-26
Abstract: 420,098. Wiring bales &c. COX, H. W., 107, Pitt Street, Sydney, Australia. May 26, 1933, No. 15222. [Class 45] [See also Group XXII] Relates to a manually-actuated bale, &c., wiring machine of the general type described in Specifications 200,125 and 264,313, [both in Class 45], having means for automatically throwing out the tensioning mechanism when a predetermined tension is reached and coupling the twisting mechanism to the driving shaft and having two twister pinions whereby a triple twist tie as in Specification 202,335, [Class 45], is produced, with means to overtwist the twisted wires before the spare ends are cut and thereafter to return the twister pinions to the position wherein the radial slots therein are horizontal and finally to reset the tensioning mechanism. The end of the wire leading to the supply reel is clamped between a cam lever 63, Fig. 1, and a plate 62 both carried by a block 64 pivoted at 65. Another block 66 is pivoted at 65 and a spring 69 is confined between an ear on this block and the head of a bolt 69a carried by the block 64. An adjustable spring 73 bears on a toggle lever 71 which carries a roller 72 engaging the block 66 and a double clutch member 12 slidably mounted on the manually rotated shaft 10 is connected by a link 26b to the block 66. The spring 73 normally maintains the clutch 12 in engagement with the hub 14 of the first wheel of the gear train which rotates the winding drum 23 and a pawl 25 prevents reverse movement of the drum. When the tension on the wire reaches the limit determined by the spring 73 the block 66 rotates counterclockwise and pulls the clutch 12 to neutral position whilst the spring 69 completes the movement of the block 66 relatively to the block 64 to move the clutch further into engagement with the first wheel 27 of the gear train rotating the slotted twisting pinions 35, 35a. The movement of the block 66 also rotates a lever 59 clockwise against a spring 60, the free end of the lever being a fork which engages a sleeve 44 slidably but non-rotatably mounted on a shaft 17 on which the gear wheels 30, 34 engaging the twisting pinions 35, 35a are loosely mounted. The sleeve is provided with axially-projecting pins 45, Fig. 2, a radial extension 51 and teeth 44a on a quarter of its periphery. The teeth mesh with a quadrant 47 forming one of the cutters and the radial arm 51 engages an adjustable spring 56. During tensioning, when the sleeve 44 is in its right-hand position, the pins 45 engage elongated recesses in the gear wheel 30 ; as soon as the sleeve 44 is moved to the left by the fork lever 59 the pins 45 are withdrawn from these recesses and the spring 56 rotates the sleeve 44 clockwise to a limited extent and the pins no longer register with the recesses. The hooked end of the lever 61 having by this time been freed from the block 66, the spring 60 restores the sleeve 44 to its right-hand position but the pins 45 cannot re-enter the recesses in the gear wheel 30 until the latter has been fully rotated to twist the wires held in the slotted pinions ; when this happens the gear-wheel 30 and sleeve 44 rotate together counterclockwise to overtwist the wires and to compress the spring 56. Towards the end of the overtwisting operation the cutting edge of the quadrant 47 engages and severs one end of the wire ; the spring 56 now partially rotates the gear-wheel 30 and sleeve 44 clockwise to restore the twisting pinions to the position wherein the radial slots are horizontal, this clockwise rotation being limited by the engagement of a pawl 41 in a recess 40 in the boss 38 of the gear wheel 30. The cutter operating on the other side of the twist is operated simultaneously with the quadrant 47. Release of the tension on the blocks 64, 66 due to the cutting of the wires permits the spring 73 to restore the lever 71 on the blocks 64, 66 to the position shown and to move the clutch 12 into operative engagement with the tensioning-mechanism as shown. The spindles of the twisting pinions are slidably mounted and a spring 37 is provided between them to permit relative movement during twisting to compensate for the shortening of the wires due to the twisting. The tensioning drum comprises a peripherally grooved annulus 75, Fig. 5, rotatable on a collar 74 to a limited extent. Radial apertures 78a are provided in the annulus and normally register with similar apertures 78b in the collar ; the wire is inserted in the apertures 78a, 78b and as the collar is rotated by the tensioning gear-train the annulus slips somewhat and kinks the wire between the apertures, thereby holding the latter securely.