Patent GB-702153-A (GB)
Title: Improvements in or relating to wrapping machines
IPC: B65B41/14
Filed: 1951-04-13
Abstract: 702,153. Wrapping - machines. FORGROVE MACHINERY CO., Ltd., and BROOK, L. March 26, 1952 [April 13, 1951], No. 8651/51. Class 94 (1) [Also in Group VIII] In a wrapping machine of the type comprising a plunger for lifting articles in succession into a wrapping,mechanism, a picker at one side of the plunger for intermittently feeding the end of a web of wrapping material horizontally into position above the plunger and an intermittently-operating knife at the other side of the plunger for severing a wrapper from the leading end of the web so that it is lifted with the article, the knife is mounted on a wrapper feed table which is slidable on the machine framework, in a direction parallel to that in which the wrapper is fed, to vary the position of the knife in relation to the lifting plunger and hence the length of the wrapper applied to the article, the feed table being readily detachable from the machine framework and carrying a linkage for imparting movement to the knife which, in all positions of adjustment of the feed table, coacts with a cam-operated actuating member. The machine shown comprises a picker 9, a lifting plunger 25 and associated wrapping mechanism as described in Specification 702, 154. The feed table 14 comprises a lower plate 33, for supporting the web of wrapping material, and a cover member 34 pivoted on an inclined stud 36, so that it may be swung open for cleaning purposes, and retained in its closed position by a spring-loaded catch 37..The plate 33 carries guides 43 for the edges of the web which are adjustable in a slot 44 in a transverse V-section slide 45, the guides being held in position by compression springs 46, and scales 47 being provided on the slide to facilitate the adjustment. The slide is held in position frictionally by a peg 49 on a flat spring 48 secured to the table, but can be moved bodily by turning an eccentric stud 90. The table has a depending tongue 151 slidable in a slot 51 in a fixed frame member 52 and is tapped to receive an adjusting screw 53 having a neck 54 of reduced diameterwhich rests in an upwardly open groove 55 in the member 52. A clamp screw 56 is inserted from below through a longitudinal slot 57 in the framework into a tapped hole in the plate 33. The screws are provided with knobs 58 and, 59 to enable manual adjustment of the table, the position of which is indicated by an index 61 co-operating with a scale 60. The table can be readily detached after removal of the screw 56. The web is fed by the picker between knives 15, 150 extending transversely of the table and urged into contact by a spring 69, the knife 15 being secured to a longitudinal shaft 62 carrying an arm 63, and the knife 150 being pivoted on the shaft and carrying an arm 64 which is coupled by a pin 65 to an arm 66 on a sleeve 67, surrounding the shaft and carrying an arm 68. The ends of the arms 63, 68 are coupled by toggle links 70, 71 to a pin 72 on a lever 73 pivoted at 74 to the end of the feed table and carrying a tappet 75 which engages the upper end 76 of a bar 77 under the action of a spring 78 which is connected to an arm 79 on the lever 73 and tends to close the knives. The bar 77 is slidable vertically on the machine framework against the action of a spring 80 and is pivoted to an :arm 81 on a rocking shaft 82 which carries another arm 83 fitted with a follower 84 engaging a cam 85. The latter operates the arm 83 periodically to raise the bar and thus open the knives. The end 76 of the bar is of such length that the tappet 75 coacts with it in all positions of adjustment of the feed table.