Patent GB-334798-A (GB)
Title: Improvements in strap stretching and sealing devices
IPC: B65B13/34
Filed: 1929-11-27
Abstract: 334,798. Glardon, E. C. Nov. 27, 1929. Wire strainers. - In a bale-strapping machine, one end 7 of the strap is placed beneath the sealing device 35, Fig. 1, the strap is then passed between clamping members 5, 6, and around the bale &c. and is then guided, either up an inclined surface 33 or through a slot in the base plate 1, beneath the sealing device again and the other end 4 passed between coacting serrated rollers 2, 3 which comprise the tensioning device. The clamping members 5, 6, Fig. 4, are carried respectively by the base plate 1, and a U-shaped bracket 28 in which the serrated roller 3 is rotatably mounted and which is provided with an upstanding limb 29 through which the shaft 8 on which the other serrated roller 2 is secured freely passes. The bracket 28 is also pivoted at 31, Fig. 1, for movement in a vertical plane. The shaft 8 is rotatably and eccentrically mounted in discs 9, 10, Fig. 4, which are rotatably mounted in brackets 11, 12 forming part of the base plate.. The discs 9, 10 are provided with arms 21, 22 to which a handle 23, Fig. 1, is secured so that the discs can be rotated to lower and raise the shaft 8. The first effect of lowering the shaft is to move the member 6 into clamping engagement with the portion of the strap resting on the other member 5; subsequent downward movement of the shaft causes the serrated roller 2 to move downwardly into engagement with the other portion 7 of the strap resting on the other roller 3. The roller 2 is then rotated through a pawl and ratchet lever 18 to tension the strap, a second pawl 16 being provided to prevent return movement of the shaft 8. Rotation of the discs 9, 10 also withdraws a locking rod 61, Fig. 1, from an aperture 62 in the sealing device 35 which is slidably mounted on a guide 36. The sealing device comprises two plates 35 spaced apart by the pivot pins 48, 49, Fig. 5, of a pair of jaws 46, 47 which are linked at their upper ends to a link 41 which is pivoted to a lever 39, Fig. 1. The lever 39 is provided with a link 40 pivoted to one of the brackets 11. A block 50, Fig. 5, is rigidly secured between the plates 35 and is provided with a pair of slotted jaws 51, 52, the teeth 55, 56 at the lower ends of the jaws 46, 47 working in the slots in the jaws 51, 52. Depression of the lever 39 first moves the sealing device downwardly along the guide 36 with the relative positions of plates and jaws unchanged so that the block 50 and jaws 46, 47 straddle the strap lengths 4, 7 and clip 53 therefor if a clip is used. The connecting pin 42 of the links 41, 44, 45 is guided in grooves 43 formed in the opposing faces of the spaced plates 35. Movement of the jaws 46, 47 about their pivots is prevented, until after the sealing device has been lowered, by a stationary guide 63 which engages a shoulder 65 on the upper end of one of the jaws. Further depression of the lever 39 rocks the jaws about their pivots so that the teeth 55, 56 at the lower ends of the jaws pass through the slots in the limbs 51, 52 of the stationary block 50 and cut and deform the clip 53 and straps 4, 7. Opening movement of the jaws is effected by the engagement of the curved portion 64 of the guide 63 with the shoulder 65. Stops 37, Fig. 1, and 38, Figs. 1 and 5, limit the vertical movement of the plates 35.