Patent GB-445159-A (GB)
Title: Improvements in and relating to wrapping machines
IPC: B65B25/16
Filed: 1935-01-19
Abstract: 445,159. Wrapping-machines. AMERICAN MACHINE & FOUNDRY CO., 511, 5th Avenue, New York, U.S.A. Jan. 19, 1935, No. 18530. Convention date, May 5, 1934. Divided out of 445,058. [Class 94 (i)] A wrapping-machine of the type described in Specification 404,976 is provided with means whereby the tension of the wrapper about the article is adjustable by devices which coact with the last trailing edge portion before it is folded, and which are adjustable to vary the drag while it is being folded. The progress of the article through the machine is as follows. The article L is fed by a conveyer 39 with pushers 47 on to a lifter table 57 which rises with it to the level of a slicing table 83. A pusher 370, operated by a rack 373 and pinion 374 on an oscillating shaft 375, forces the loaf past slicing knives 86, if the slicing mechanism is in the operative position, and has a stroke sufficient to feed the sliced loaf across the table 83 on to a lifter 108, carrying with it a wrapper W and a frictionally mounted back tension plate 312, so that the wrapper is clamped between the tension plate and the loaf. The wrapper W, which was depending in front of the loaf L as shown in Fig. 1, is partially applied when the loaf moves to the left, folders 208 on the lifter making the first end folds. The lifter rises to the level of the delivery table 221 and the application of the wrapper is completed as described in Specification 404,976. A floating rod 313 drapes the wrapper over the top and down the right-hand side of the loaf, and towards the end of the ascent, contacts with a lever 314, Fig. 1, to lift a clamping roller 315 away from the roller -wrapper. In order to vary the tension, rods of different weights may be used. After the edge of the web has been freed from the rolls 315, 316, it is subjected to an adjustable tension while a pusher 223, Fig. 1, moves the partially wrapped loaf P to the right. An adjustable quadrant 341, Fig. 2, is provided with a spring 343 bearing on pins 342b on a drag lever 342 co-operating with a roller 344, so that the tension on the wrapper while it is being drawn from between the elements 342, 344 can be adjusted. In order to throw the lever 342 out of action, the quadrant is moved so that the spring bears on the pins 342a. A heating element may be provided beneath the left - hand edge of the delivery table 221 in order to seal the overlapped edges forming the bottom seam. The wrapping material is fed from a reel R by feed rollers 120, 121, Fig. 1, and enters a guideway on the lifter 108, then in the upper position shown in broken lines in Fig. 1, and the forward end passes over the roller 316, and is clamped by the descent of the roller 315 on the arm 314. The web is severed and the severed portion is carried down by the descent of the lifter. Overrunning due to the inertia of the reel R is prevented by means of a friction brake on the shaft R<1>, The rollers 120, 121 may be separated by a hand lever to discontinue the feed without stopping the drive, and the pressure between these rollers is adjustable. The clamping roller 316, Figs. 1 and 6, is prevented from overrunning by means of bushes 316e, 316f, pressed on a non-rotating sleeve 316g and collar 316c by a spring 316b, the pressure of which is adjustable by means of a nut 316d.