Patent GB-398316-A (GB)
Title: Machine for hooping or strapping boxes and other packages or objects
IPC: B65B13/28
Filed: 1932-07-02
Abstract: 398,316. Strapping boxes &c. BRENNEISEN, H., 60, Rue Planchat, Paris. July 2, 1932, No. 18797. Convention date, March 25. [Class 45.] In a machine for strapping, hooping, or binding boxes &c. with wire, band-iron, or other binding material in which means for securing the two ends of the wire and for stretching the wire are combined with mechanism for twisting, tying, or otherwise assembling the strands of wire, means are provided for locking the stretching-mechanism when the tension of the wire reaches a predetermined value, the assembling-mechanism which has been locked during the stretching being unlocked at the same time as the stretching-mechanism is locked. One end 2a of a wire 2 is clamped between a stop 33 and a serrated cam 34 mounted on an arm 36 pivoted at 37 to a baseplate 3. The wire is then passed through a slotted guide 25, a slotted torsion pinion 21 and a slotted guide 25a, round the box &c. and again through the guides and pinion, the end 2b being passed under a serrated cam 38, which holds it firmly against a branch 43 of an angle bracket 44, and then to the stretching-mechanism comprising a serrated cam 46 which holds the wire against a branch 53 of an angle bracket 54, the cam 46 and its associated parts being mounted on an arm 49 pivoted at 50 to the baseplate. The cams 38, 46 are loose on eccentric axles 39, 47 respectively and are turned by rockers 41, 51 controlled by springs 45, 55. The rockers 41, 51 have bevelled inclined branches 42, 52 which co-operate with the branches 43, 53 of the angle brackets so that the cams are turned against the action of the springs when the wire is inserted. The arms 36, 49 are connected by springs 61, 61a and the wire is stretched by the movement of a pivoted lever 56, Fig. 2, in the direction of the arrow f<3>, an extension 59 of the lever bearing on a projection 60 on the arm 49 and turning the arm 49 about its pivot 50. At the end of a stroke the lever 56 is returned by a spring 58 and the serrated cam 46 rides over the wire which is gripped and kept in tension by the serrated cam 38. When the tension in the wire reaches a certain point which may be adjusted by varying the tension in the springs 61, 61a the arm 36 is pulled inwards against the action of these springs to the position shown in Fig. 5 at which point the tensioning-mechanism is locked. The locking means comprise a sliding spring-pressed member 65 with serrated edge 64 which is normally held back by the engagement of a projection 68 on the member 65 with a pivoted cam 70 operated by a shoulder 72 on the arm 36. When the arm 36 is pulled inwards as in Fig. 5 the cam 70 is moved out of engagement with the projection 68, the member 65 being then pushed forward by springs 66 into engagement with a serrated projection 62 of the tensioning arm 49 which is thus locked. At the same time a lever 4 which is loosely mounted on a shaft 5 and actuates the torsion pinion is unlocked by the movement of an upstanding projection 77 mounted on a shoulder 76 of the arm 36, the projection 77 having a hook 78'which normally engages the lever 4. The lever 4 is moved upwardly by the action of springs 29 connected to the pivoted severing knives 27, 27a, the knives having lugs 31 which engage plates 32 on the lever 4. The lever 4 is then pulled over in the direction indicated by the arrow f<10>, Fig. 3, until a spring-pressed latch 7 on the lever enters one of two notches 13, 14 in a cam 12 secured to a gear wheel 15 rotatable on the shaft 5. The lever is then pulled in the reverse direction, rotating the gear wheel 15 which actuates the torsion pinion 21 which twists the wires, and towards the end of the stroke of the lever the plates 32 engage the lugs 31 and the wires are cut by the knives 27, 27a. When the wires are cut the arm 36 swings outwardly, the shoulder 76 contacts with a stop 74 which moves the sliding member 65 back against the springs 66 releasing the tensioning arm 49, the cam 70 turns to engage the projection 68 and the hook 78 is moved to lock the torsion lever 4.