Patent GB-190415940-A (GB)
Title: Improvements in and relating to Delivery Mechanism for Rotary Web Printing Machines.
Inventor: ANNAND ROBERT CUMMING
Filed: 1904-07-18
Granted: 1905-07-13
Abstract: 15,940. Annand, R. C. July 18. Rotary machines cutting-apparatus; delivery apparatus; folding paper; associating- apparatus; ; web - turni n g apparatus. -In rotary web - printing machines, the web is cut into any length of sheet without altering the average velocity ratio between the cutting and printing cylinders. After cutting into the desired lengths of sheets, the sheets are given one or two transverse folds, then a longitudinal fold, and finally, if desired, a transverse fold. Before being cut, a transverse line of paste may be applied to the web by a pasting-roller, and, if web-turning bars are used, they are made hollow and heated internally to minimize the smearing of the paste or ink. For cutting the web, in one form of apparatus, Fig. 1, the cutting-rollers 1 revolve at a velocity having a surface speed at least as high as the highest speed of the web when the longest sheet is being formed. A roller 5, mounted on arms reciprocated by a cam-actuated shaft, loops the web, and, during the cutting- operation, the loop is straightened out at such a speed that the velocity of the web when in contact with the cutting-blade is equal to the linear velocity of the cutting-blade, the cam actuating the looping-devices being changeable. In another form of apparatus, Fig. 3, the cutting-members 11, 12 are mounted on adjustable slides 10 so that, by moving them further from or near to the centres of the shafts 13 their linear velocity may be altered to correspond to that of the web. The distance apart of the shafts 13, driven through gear-wheels 20, 21, is also adjustable as shown. In another form of apparatus, the cutting-cylinders are driven at a varying speed at different portions of the revolution by eccentric or oval spur-wheels, the positions of which are adj ustable so that the surface speed of the rollers at the instant of cutting is equal to that of the web. The eccentric wheels are preferably adjusted by clamping them to flanges by bolts, the heads of which run in circular slots in the flanges. Another form has cutting-cylinders revolving at a greater surface speed than the web at its maximum speed, and one cutting-cylinder carries an ordinary perforating- blade, while, in the other, a groove is formed, into which the web is pushed by the blade. At the same moment, the leading end of the web is caught by nipping-rollers, and the web is pulled taut and severed. With this device, spring buffers such as are usually required at the sides of perforator bars may be dispensed with. The sheets may then pass to the folding-apparatus, Fig. 7. The sheet is seized by grippers 40 on a cylinder 39 and the centre of the sheet 36 is pushed by a folding-blade 41 into folding-grippers 42 on a cylinder 43. If a second transverse fold is required, the folding-blade 44 tucks the sheet into folding - grippers 45 on a cylinder 46 ; otherwise, the blade 44 is put out of action, and ordinary grippers 60 take the sheet from the grippers 42. The sheet then passes along tapes 47 to receive a longitudinal fold by the blades 53 and rollers 51, whence it passes by tapes either to a delivery apparatus, or to a second pair of folding- rollers 55, 56 to give it another transverse fold, after which it is delivered on tapes 63 or otherwise. In order that various sizes of sheets may be folded, the folding-blades and folding - grippers on the cylinders 39, 43 are mounted on arms pivoted on the shafts, and adjustable with reference to the cylinder. The blades, or one of the arms carrying them, are in some suitable manner fixed to the gear-wheel, which is loose ou the shaft, and adjustably clamped by bolts or otherwise to the cylinder. This prevents the adjustment of the devices on one cylinder from throwing those devices out of working relation with the devices on the next cylinder. The conveying-grippers of the third cylinder are also adjustable The webs, before passing to the cutting &c. devices, may have a transverse line of paste applied to them as they pass over a pasting- roller 74, Fig. 13, filled with paste injected through a hollow shaft. The roller 74 carries a small roller 76, slowly revolved by any suitable mechanism, but preferably by a worm-wheel at one end gearing with a worm on a small shaft mounted in a bearing on the cylinder 74, and having a bevel-wheel gearing with a fixed bevel - wheel concentric with the cylinder 74. The opening through which the small roller 76 projects is adjusted in size by moving the strickle - boards 82. The web - turning bars 88, Fig. 16, which are used with webs pasted as above, or otherwise treated, are preferably made hollow, and fitted with a downwardly-turned nozzle 89 at one end, having a gas flame 90, by which they are heated, the circulation being promoted by a small chimney 91 at the opposite end. The smearing of the web is thereby minimized. Other means, such as steam or electric devices, may be employed instead of gas burners to heat the bars.