Patent GB-497890-A (GB)
Title: Tying machine
IPC: B65B13/10
Filed: 1938-01-17
Abstract: 497,890. Bundling-machines. HARVEY, H. Jan. 17, 1938, No. 1559. Convention date, Nov. 27, 1937. [Class 94 (i)] The machine applies a wire around an article and places the overlapping ends in the slot of a twisting device, means being provided for re-setting the parts for the next cycle. The wire 63 is applied by a shuttle 31, Fig. 1, on a carrier 41 adapted to travel round an annular frame 27 of irregular form. The article 24 is placed on a table 23 against an abutment 25 so that the part to be wired projects through the frame 27, the forward part being supported on an auxiliary table 91. The annular frame comprises a rail 30, Figs. 6 and 9, engaged by four rollers 32 on the shuttle carrier 41, and an angle iron 33 carrying a rail 34 and guide rail 36 engaged by a driving chain 35. The chain is constantly driven from a shaft 38, and carries brackets 40 adapted to be engaged by a spring- pressed pawl 42 on the shuttle carrier 41. The pawl is disengaged from a bracket at the beginning of each cycle by a pedal 47 and rod 48 connected to a control plate 43. The control plate is mounted on links 44, 45 and is normally pulled upwards into the disengaging position by a spring 46. To start the cycle, the pedal is depressed and the plate pulled down and held in the position shown in Fig. 9 by latches 49, 50 engaging lugs 51, 52. When the latch 50 is engaged, the latch 49 has some play. The shuttle carrier is now carried upwards in the direction of the arrow and completes the application of the wire to the article. On arriving back at position A, the carrier lifts the latch 50 from its lug 52, causing the plate to rise and be held by the latch 49. Further travel of the carrier lifts the latch 49, and the plate 43 rises to the disengaging position. The carrier, being no longer connected to the driving chain, falls by gravity and allows a loop of slack wire to form to provide for resetting. The wire passes from the first gripper 57 through the twister pinion and is tripped clear of the second gripper 61 to allow it to encircle the article. The second time it passes the point A, the wire is not tripped and passes into the gripper 61. Tensioning and twisting is now effected by known means. The operation may be started automatically by the engagement of a camsurface 76 on the carrier with a bell-crank lever 74, 75. A spring-plunger 73 on the arm 74 raises a tripping plate 71, Figs. 1 and 6, and releases the second gripper 61 into gripping position ; and, through a link 70, releases a trip plate 66 to allow a driving pawl 65 to engage the driving member 78 and rotate it through one cycle. Threading mechanism 79, of known type, takes the supply end of the wire to the first gripper. The wire tripping means comprises a lever 82, Fig. 6, having a bevelled front end 83 which deflects the wire from the end 84 of the second gripper, and is then released to an inoperative position by the engagement of the shuttle carrier with a bell-crank lever 89, 87, which releases a latch 88 and allows the spring 86 to swing the lever about its pivot 85. The auxiliary table 90, for supporting the front end of the bundle, is arranged to swing out of the way when engaged by the shuttle. The shaft 92 carrying it is mounted in a casing on a horizontal shaft about which a spring is disposed to urge the shaft 92 upright. The shaft 92 also engages a bevel gear to cause it to turn the table about an angle to increase the clearance. The annular frame may be replaced by others of different sizes or shapes according to requirements.