Patent GB-716703-A (GB)
Title: A new or improved method of and apparatus for corrugating or pleating sheet material
Inventor: GONDA DESIRE
IPC: B31F1/22
Filed: 1949-12-29
Abstract: 716,703. Corrugating sheet material. HOLOPLAST, Ltd. Dec. 22, 1950 [Dec. 29, 1949], No. 33251/49. Divided out of 716,702. [Group VIII]. Class 141 A method of corrugating or pleating sheet material comprises advancing the sheet edgewise, i.e. longitudinally in the direction in which the corrugations are to expand whilst simultaneously displacing the sheet material to a progressively increasing extent transversely out of its original plane, this displacement being effected along laterally spaced straight lines extending longitudinally-of the sheet at nredetermined positions corresponding to the line along which are to extend the crests and/or bases of the corrugations, whilst simultaneously progressively drawing the sheet material laterally inwardly to compensate for the transverse displacement, and creasing the crests and/or bases of the corrugations so formed to impart an enduring set thereto. As shown, the sheet, preferably of paper impregnated with thermo-setting resin to be provided with V-shaped corrugations, is fed between a plurality of co-operating upper and lower horizontal guide plates 6, 7, Fig. 5, which are flat at the front end and gradually assume a V-shaped form of increasing amplitude. The paper is fed to the machine between a lower belt 224, Fig. 9; and an upper belt 232. Rollers 223, 239, 240, 227, 231, 238, 241, Fig. 11, and a bowed roller 233, consisting of a series of straight sections inclined to each other, are provided so that the paper assumes an S-formation before passing between the guide plates 6, 7. The feeding of the sheet 2 is assisted by a series of pairs of preforming or corrugating wheels 10, 11, 10<1>. 11' and 10<11>,11<11> operating along the crest lines of the corrugations through slots 99 between the plates 6 and central longitudinal slots in the plates 7, and a further series of pairs of wheels 12, 13 and 12', 13<1> operating on the bases of the corrugations through slots 100 between the plates 7 and central longitudinal slots in the plates 6. The pairs of wheels 10, 11, 12, 13 &c. have interengaging grooves and recesses. Each series of wheels 10, 10<1>. 10<11>, 11, 11<1>, 11<11> &c. is mounted, on a tranverse shaft, e.g. 105, 107 built up of a plurality of sections, the wheels being. axially adjustable on two shafts. The' crest and base lines are set by pressing them between pairs of nipping wheels 14, 15, 14<1>, 15<1> mounted on driving shafts and urged together by spring means, internal supporting wheels 18, 18<1> rotated in the opposite direction being provided. The sheets are delivered between rollers 212, 213 which are adjustable towards and away from each other. The machine includes a head frame 43, Fig. 11, which can be raised and lowered hydraulically with respect to a horizontal bed frame 33 supported by pillars 34. The frames supporting the guide plates 6, 7 which are pivoted in the front ends of arcuate guide plates 60, 58 and supported by studs passing through slots in the arcuate guide plates 60, 61, 58, 59 and the rear ends are connected to pairs of pivoted cam plates 93, 94, 73, 74. Drive is transmitted to all the feed, preforming and nipping wheels, and delivery rollers through a shaft 153 driven by an electric motor. A control panel 278 carries valves to control the hydraulic pressure and electric switch gear.