Patent GB-1420390-A (GB)
Title: Method of affixing labels to a web of sheet or film material and apparatus for carrying out said method
IPC: B65C1/02
Filed: 1973-04-09
Abstract: 1420390 Labelling apparatus ROLLES FABRIKER AS 9 April 1973 [22 Aug 1972 26 Sept 1972] 16998/73 Heading B8F [Also in Division A4] Labels or patches are applied to one or both sides of a double-walled web P divided by transverse welds into carrier bag blanks, which labels or patches are adapted to provide reinforcements around hand-holes punched in the bags, by advancing the web stepwise through intermittently-driven feed rolls 37 and 38 through a distance corresponding to bag widths, and rolling a label on to the web by means of a rotatably-driven suction cylinder 18, which is pivoted into engagement with the web when the feed rolls are inoperative and pivoted out of web engagement when the feed rolls are operative, the cylinder and web being moved relative to another in the plane of the web at a translatory speed equal to the cylinder peripheral speed during label application. As shown, the web passes around pulleys 3 and 6 carried at the ends of a tilting lever 36 to provide transverse web loops upstream and downstream of opposed suction cylinders 18 and 18a. When feed rolls 37 and 38 are operative, the tilting lever is moved from position I to position II by a cam drive 33 to increase the extent of the upstream loop and to reduce the extent of the downstream loop. When the feed rolls are inoperative during labelling, the lever moves from position II to position I to reduce the extent of the upstream loop and increase the extent of the downstream loop so that the web is moved between the cylinders at a speed equal to the cylinder peripheral speed. The cylinders are mounted on and driven through gear-boxes 41 and 44, gear-box 41 being pivoted about roll axis 17 by a cam 42 co-operating with follower roller 42a to swing the cylinder 18 into and out of engagement with the web on cessation and initiation of feed rolldrive respectively. The input shaft 20 to the gear-boxes is driven through a one-way clutch by a chain 22, which has its ends 29 and 30 fixed and which passes round chain wheels 23 and 27 on the tilting lever, so that drive is only transmitted to the gear-boxes and cylinders on movement of the tilting lever from position II to position I. The labels are severed from selfadhesive strips 19, which are drawn from rolls 10 and 11 and pass round dancing rolls 19a, by pneumatically-operated knives 39 and 40 when the suction cylinders are stationary. In a second embodiment, Figs. 2 and 3 (not shown), the suction cylinders 18, 18a and gear-boxes 41, 44 are carried on a sliding bracket 45, which is moved to position II from position I by springs 48 when the feed rolls 37, 38 are advancing the web a bag-width increment with the gear-box 41 and cylinder 18 being swung away from the web by a cam (not shown). During the labelling step, the bracket is driven to the left by a cam 49 operating through a rack-and-pinion drive 52, 53, and 54 whilst the cylinder 18 is swung into engagement with the web and is rotatablydriven through a one-way clutch by a rack-andpinion 55 and 56 so that the cylinder peripheral speed is the same as the relative web/cylinder translatory speed. In a modification, the bracket may move transverse to the direction of web feed.