Patent GB-878768-A (GB)
Title: Improvements in and relating to machines for wrapping bundles or stacks of newspapers
Inventor: SYKES THOMAS ROBERT
IPC: B65B27/08
Filed: 1957-08-27
Abstract: 878,768. Cutting webs. TORONTO STAR Ltd. Aug. 27, 1957, No. 27027/57. Class 31 (1). [Also in Group XVII] A machine for cutting-off a sheet of wrapping paper from a web of paper placed beneath a bundle to be wrapped comprises a conveyer A, B, C, Fig. 2, for the bundle, a supply of wrapping paper 20 below the conveyer, and co-operating severing means 38, 39, Fig. 6, both below the conveyer and spaced from one another longitudinally of the conveyer, there being means 8, 25 for feeding a web of the wrapping paper up on to the conveyer and means for oscillating the severing means 38 up through the conveyer to perform a cutting action in association with the other severing means 39. Conveyer. This is in three sections A, B and C. Sections A and C comprise roller flight conveyers 2a and 2b that are driven in synchronism, and section B comprises four driven rollers 6, 7, 8 and 9, adapted to have a progressively increasing surface speed from left to right. Wrapper supply. Below the machine, Fig. 2, are two withdrawable carriers 54 each holding a roll 20, 21, of wrapping paper so that when one roll 20 is exhausted a fresh roll 21 is already in position for feeding into the machine. The wrapping paper passes up between guide means 23, 24, then through gripper means 29, 50, Fig. 6, and finally between a roller 25 and the roller 8, the roller 25 being displaceable from the roller 8 about an axis 26. Operation. As a bundle leaves the roller flight conveyer 2a it displaces a switch arm 30, Fig. 1, to close a relay preparing a circuit for other switches to be actuated as the bundle advances. As the forward edge of the bundle reaches the upper edge of the wrapping paper between the rollers 25, 8, it also contacts a second switch arm 31 and this switch causes a pneumatically-operated piston 28a to move the roller 25 towards the roller 8 to grip the paper therebetween and, at the same time, to open the grippers 29, 50. The driven roller 8 then draws the paper from the supply and feeds it along the conveyer beneath the bundle. When the bundle has passed the switch 30 the return movement of the switch 30 causes a pistonoperated rack 33a to move forward from the position shown in Fig. 6. The rack 33a is geared to a pinion which, on rotation, causes a cutter bar 38 to swing over the roller 8 and then down against a saw-toothed knife edge 39 below the paper 19 to cut the paper. Continued forward motion of the rack 33a causes it to engage a press button 42a of a switch 42 to cause (a) the cutter bar 38 to return to its original position, (b) the roller 25 to move away from the roller 8 to prevent further feed of the wrapping paper, and (c) the grippers 29, 50, to close to prevent the paper from being withdrawn from between the rollers 25 and 8. The wrapper has now been positioned beneath the bundle and the bundle passes over the conveyer section C to either a tying machine or another conveyer. The length of the tail end of the wrapper behind the bundle is controlled by the position of the end of the switch lever 30. Both switch arms 30, 31 are slidable along the machine and cams within the switches are also adjustable so that the wrapper length extending beyond either end of the bundle is adjustable. Stop means in section A. When the cutter bar 38 is being actuated an air-operated cylinder 45, Figs. 1 and 2 causes a piston 45a, to project up between the rolls 6 and 7 to stop the forward movements of any following bundles of paper. When a bundle has cleared the switch arm 31 the piston 45a descends to permit a further bundle to pass from the section A to the section B. Knife guard.-To provide a guard for the knife-edge 39 a safety bar 43 as shown in Fig. 6 is provided. A sheet metal guard 43a, attached to the safety bar, is located close to the roller 8 to prevent the cut end of the paper web from winding around the roller 8. The safety bar is supported by two arms 44, 44, rotatably mounted on shaft 36. When the cutter bar 38 is in the position shown in Fig. 6, extensions 37a associated with the cutter bar 38 contact the safety bar to bring it up above the knife 39. When the cutter bar 38 is actuated, the extensions 37a rotate downwardly and a spring 49 moves the safety bar 43 to a position below the severing means 39. The return of the cutter bar 38 to the position shown in Fig. 6 brings the safety bar into its raised position. Specification 878,769 is referred to.