Patent GB-660823-A (GB)
Title: Machine for forming article supporting pallets for wrapping machines
IPC: B31F1/22
Filed: 1948-12-13
Abstract: 660,823. Corrugating cardboard. PACKAGE MACHINERY CO. Dec. 13, 1948 [Dec. 12, 1947], No. 32184/ 48. Class 141. [Also in Groups VIII and XVI] A machine for making article-supporting pallets for wrapping machines includes rolls for advancing a web of thin cardboard, a cutter for severing pallet-length strips from the web, opposed forming rolls contoured to form spaced parallel longitudinal corrugations in the pallets, and bending means positioned between the advancing rolls and forming rolls, so as gradually to bend the material of the pallets into corrugated shape whilst the web is actually in motion and prior to the entry of the web into the forming rolls. The web W, Figs. 1 and 2, fed by rollers 7 under a roller 23 having a blade 20 co-operating with a fixed blade 25 to cut the web into lengths, is operated on successively by rollers, 27, 28, fixed guides 59, 61, 60, rollers 29, 30, fixed guides 78 and forming rollers 31, 32, the corrugated sheet then being passed by rollers 33, 34 and feeding mechanism to a wrapping machine.. The first pair of rollers 27, 28 are formed with a central rib 51 and groove 54 respectively which engage the sheet, the remainder of the rollers being spaced so as to bend the sheet at a, b, Figs. 12 and 13, into a general channel shape. The guides 59 and 61 engage the sheet at either side to maintain the bends a, b and then the guides 60, which have an inclined edge, engage the outer edges to bend them downwardly as at c. Rollers 29, 30 are formed with opposed ribs and grooves 67, 68 and 69, 70 of which only the central pair 67, 68 engage the sheet, the remainder of the rollers being spaced so that the sheet is bent to the general shape of the required corrugations, guides 78 then engaging the sheet to pass it to final forming rollers 31, 32 which have ribs and grooves engaging the sheet across the whole width. The rollers are all centrally split as at 52, 55 and 71, 72, the halves being secured to the shafts of the rollers by set screws so that the spacing of the corrugations may be varied. The shafts of the lower rollers 28, 30, 32, 34 are journalled in the machine frame 1 and the shafts 35 of the upper rollers are each journalled in a bifurcated arm 36 of a bell crank 37 pivoted on a rod 38, which rods 38 are secured in spaced lugs 39 depending from a plate 40. The other arms 41 of the bell cranks 37 engage adjustable stop screws 42 to limit the downward movement of the arms 36 and upper rollers, and the arms 36 are pressed down by springs 45 on collared pins 44 adjustable to vary the spacing between upper and lower rollers for varying thickness of material. The plate 40 is pivoted at 46 to the machine frame 1 to be swung out of operative position to provide access to the lower rollers and has a clamping latch 47 secured by a nut 50. The feeding, cutting, shaping and forming rolls are driven from the wrapping machine through a chain 160 driving a shaft 91 which drives the roller shafts through suitable gearing, the speed of the shaping and forming rolls being greater than that of the feed rolls 7 and cutter roll 23 and that of the rolls 7 being adjustable relative to that of the cutter roll 23 to vary the length of the severed sheet.