Patent GB-634249-A (GB)
Title: Improvements in machines for tightening and wrapping rolls of wadding
IPC: B65B63/04
Filed: 1947-09-23
Abstract: 634,249. Packing. PAPER PATENTS CO. Sept. 23, 1947, No. 25829. Convention date, July 21, 1943. [Class 94 (i)] A machine for .tightening and wrapping a roll of wadding has a pair of rollers 15, 17 supporting a belt 7 and relatively movable towards and away from each other for alternating the contour of the belt between a suspended loop and a taut span, and means co-ordinately operable with the relative movement of the supporting rollers for shifting the belt so as to accelerate the change in contour of the belt, the ends of the belt being connected to a pair of winding rollers 44, 45 which are positively actuated to effect linear movement of the belt. In operation, a wrapper 59 is laid on the belt 7 (Fig. 1) and a roll 60 of wadding is laid on the wrapper. The roller 17 is carried on rocker arms 18 pivoted at 20, and the operator releases latches 21 and pushes the rocker arms rearwardly towards the fixed roller 15. The belt 7 is thus formed into a loop or sling for the roll, and when the arms 18 reach their furthest position, latches 22 engage shoulders 26 on the arms 18 to retain them in this position. Meanwhile a motor 38 which was started automatically when the latches 21 were retracted, has been driving a link belt 35 and a carriage 32 carried thereby. This carriage 32 carries a pair of rollers 33 which straddle the belt about a fixed roller 34, and movement of the carriage to the right in Fig. 1 lengthens the belt between rollers 15, 17 and thus ensures that the loop 61 formed in the belt 7 is large enough to receive the roll 60 (Fig. 5). Movement of the carriage .continues until the belt 7 is entirely out of contact with the rollers 33, 34 (see Figs. 2 .and 5) when a shoulder 41 carried by the carriage contacts a switch 43 and stops the motor 38. The operator then starts a motor 46 which drives the rollers 44, 45 through a worm drive 47, and link belts 48, 49. Roller 44 is driven 1.6 times as fast as roller 45 to effect a combined linear movement of belt 7 and reduction in size of loop 61, thereby tightening and compressing the roll 60. Sprockets 54, 55 on the rollers carry a link belt 53 which is moved until a link 50 contacts a switch 51 to stop the motor 46 and belt 7. The wrapper may be sealed around the roll by applying a quick-setting glue to the top edge of the wrapper or, alternatively, by applying a strip of gummed tape to the overlapping edge portions after a slight initial tightening, when the loose top end of the wrapper is still exposed between the rollers 15, 17. After completion of the tightening operation the operator starts the motor 46 in reverse to rewind the belt 7 on to the roller 45 until the link 50 engages a switch 52 and stops the motor 46. The wrapped roll is then loosely held in the slackened loop, and the operator depresses a treadle 27 connected by links 29 with the latches 22 which are thus released and permit the operator to retract the rocker arms 18. When these arms have been returned to their original position (Fig. 1) the motor 38 is started in reverse and the consequent inward movement of the carriage 32 brings the rollers 33 into contact with the belt 7 and extends it around roller 34 until the shoulder 41 engages a switch 42 and stops the motor. By this time the belt between the rollers is quite taut again and the wrapped article is allowed to roll down on to a platform 14. The switches 42, 43 are adjustable along the frame so as to vary the extent of travel of the carriage 32, and the switches 51, 52 are adjustably supported on a rod 56 so that the amount of winding of the belt 7 on to the roll 44 may be varied with the size of roll being wrapped.