Patent GB-781899-A (GB)
Title: Apparatus for tying bundles
Inventor: SAXTON JAMES BLANE
IPC: B65B27/08
Filed: 1956-04-18
Abstract: 781,899. Bundling and wrapping-machines. NATIONAL BUNDLE TYER CO. April 18, 1956, No. 11767/56. Class 94(1). [Also in Group XXIV] In a machine for tying bundles of newspapers, bags or similar flat articles, a bundle 53, Figs. 1 and 2, provided with a top wrapper 55, is placed on a wrapper 54 and moved across a table 22 so that a plate 56 folds up one end of the wrapper. The bundle then engages a lever 49 which operates a valve (not shown) whereby compressed air is admitted to the right hand end of a cylinder 42 which encloses a piston connected by a rod 41 to a lever 35 coupled by a link 34 to a slide 28 supporting a bundle-feeding carriage 24. The bundle is thus moved to the left along the table by the carriage, whereby a pivoted member 59 folds up the other end of the wrapper 54, and is brought to rest beneath a compressing-member 69, Fig. 4, which is resiliently mounted on a slide 65 operated by an air cylinder 62. The lever 35 comprises pivoted parts 36, 37 coupled together by a spring 40, so that it can "break" if . an obstruction is encountered, and towards the ends of its stroke engages abutments 48 on a lever 44 coupled to a shock-absorber 46. The slide 28 carries an abutment 60 which operates a valve 61 in the circuit of the cylinder 62 whereby the member 69 is moved downwardly to compress the handle. A bracket 64 on the slide 65 carries a roller 81 which rocks a lever 84, Fig. 10, having a bevelled end 86 engaging a spring-loaded lever 93 controlling a clutch 98. The clutch comprises a member 97, Fig. 11, secured to a constantly rotating shaft 75 and a slidable member 99 urged to the left by a spring 100. The member 99 is formed with a sprocket which drives a chain 102 passing over an idler sprocket 103 and carrying rollers 101, 107. The shaft 75 drives a sprocket 115 coupled by a chain 114 to a sprocket 113, Fig. 6, which is rotatable on a shaft 127 and carries a ratchet wheel 128. A crank arm 129 is keyed to the shaft 127 and connected by a rod 132 to a spring-loaded chain 133 passing over a sprocket 134 on the shaft 136 of an arm 137 which carries a loop of cord 140 around the bundle, a second sprocket on the shaft 136 being coupled by a chain 138 to a sprocket 139 which drives knotting mechanism of known type. The arm 129 carries a pivoted pawl 111 which is urged by a spring 130 towards the ratchet wheel 128, but normally held out of engagement therewith by a dog 110 on an axially-movable shaft 109, Fig. 10. When the lever 93 is rocked by the lever 84, a stop 105 thereon is disengaged from the roller 101 to allow the clutch 98 to engage and drive is transmitted to the chain 102. When the latter has completed nearly one complete circuit around the sprockets 99 and 103, the roller 107 engages a cam plate 108 on the shaft 109 and moves it to the right against the action of a spring 131, thus disengaging the dog 110 and allowing the pawl 111 to engage the ratchet wheel 128. The shaft 127 and crank 129 are then rotated through 360 degrees to operate the tying mechanism. At the same time, the roller 101 rides up an inclined surface 112 on the lever 93 to disengage the clutch 98. The shaft 127 carries an arm 142 which, after completion of the tying operation, operates a valve 143 whereby the connections to the cylinders 62 and 42 are reversed so that the compressing member 69 and carriage 24 are returned to their intial positions. The cord 140 is led from a supply reel 150, Fig. 6, through an eye 151 in a lever 152 which operates a brake 154 on the shaft 149 carrying the reel so that a controlled tension is maintained in the cord. If the machine is required to deal with bundles of widely differing heights, such as those shown at 170 and 169 in Fig. 12, the carriage 24 is provided with brackets 165 carrying pivoted arms 166 abutting against stops 168. These arms engage and move the larger bundles, the smaller bundles being moved by the members 25 and 26 of the carriage.