Patent GB-698877-A (GB)
Title: Wrapping machine
Inventor: BEUTEL ROBERT JACOB
IPC: B65B59/00
Filed: 1950-04-03
Abstract: 698,877. Feeding webs. AMERICAN MACHINE & FOUNDRY CO. April 3, 1950, No. 8337/50. Class 100(i) [Also in Group XVII] In a machine for wrapping articles, such as loaves of bread, comprising an article lifter table 146 movable between a lower article receiving station and an upper article-delivery station, the wrapper web W is passed through feed rollers 142, 144 carried by the table and arranged to be driven when the table is at the delivery station to feed the web between clamping rollers 248, 250 on to a wrapper support 246. When the table moves downwardly the leading end of the web is retained on the support so that the web is draped in the path of movement of an article A on to the table. The web W of waxed paper is drawn from a roll R by auxiliary feeding rollers 60, 68 and passes over a slack roller 134 movable in vertical tracks 136 and thence over a guide roller 140 to the feed rollers 142, 144 which are driven intermittently from a cam 156 on a main drive shaft 20. The rollers 60, 68 are driven through chain and sprocket gearing and pawl and ratchet mechanism including a pawl 104 by a gear 40 which meshes with a gear segment 36 oscillated by a crank 33 on the shaft 20. The pawl 104 is coupled to a counterweighted lever 128 engaged by the ends of the slack roller 134, the arrangement being such that, when the roller is raised due to the feeding of web by the rollers 142, 144 the pawl is disengaged from its ratchet and the drive to rollers 60, 68 is rendered operative, whereby a further length of web is fed from the roll R until the roller descends to its initial position. The cam 156 actuates a lever 160 formed with an arcuate slot 166 engaging a pin 168 on a link 170 which actuates a gear segment 176 meshing with a pinion 178 secured to a sprocket 182 driving a chain 188. The chain engages a sprocket 190 which drives the roller 142 through a clutch 513, Fig. 4, the rollers 144 being driven from the roller 142 through a gearing 500, 502 and a one-way clutch 510 which ensures that the web remains engaged between the rollers 142, 144 when the table 146 is elevated by a further cam on the shaft 20. The clutch 513 is engaged when a lever 516 strikes a stop screw on a lever 590 as the table moves upwardly and is disengaged when the lever strikes on abutment 518 as the table arrives at the lower station. During the downward movement of the table the chain 188 remains stationary whereby the roller 142 is actuated to pay out slack fed by the rollers 60, 68 as the web is draped in the path of the articles. The rollers 144 are maintained in engagement with the roller 142 by springs and may be disengaged by depression of arms 507 when it is desired to thread the web between the rollers. By adjusting the position of pin 168 in slot 166, the amount of web fed by the rollers 142, 144 may be varied according to the size of the article to be wrapped. As each article is advanced on to the table it depresses a pivoted finger 574 which operates through linkage to position the stop screw on the lever 590 in the path of the clutch-operating lever 516, whereby the feed rollers 142, 144 are not driven unless an article is present.