Patent GB-319602-A (GB)
Title: Improvements in or relating to printing machines
IPC: B41F21/00
Filed: 1928-06-21
Abstract: 319,602. Molins, W. E. June 21, 1928. Rotary intaglio machines.-A rotary intaglio or like machine for printing labels &c. in multi-colour is constructed with improved means for drying the printed sheets between impressions. The sheets to be printed are fed by automatic means, or are cut from a web 1 fed from a roll 2 and cut into sheets by rotary cutters 6 after the curl is taken from the web by a device 4. The sheets are then printed by an intaglio roller printing- device 7, and are then lowered at a reduced speed in spaced parallel relation by a pair of threaded shafts 8 which support a number of printed sheets and allow the same to descend gradually in a path perpendicular to the original line of feed. The bottom sheets of the pile are removed successively by projections on bands, and by reciprocating hooked members, and are fed for the second impression in proper register to a second intaglio printing- couple 10, from which the sheets are raised in spaced parallel relation by threaded shafts 11, and each sheet when it reaches the top of the pile is again fed to a further printing-couple until the required number of impressions are printed. The means for cutting the web into sheets and forwarding these to the first couple are shown in Fig. 2, and comprise feed rollers 14, 15 mounted so as to be capable of being tripped if the web breaks, cutting-rollers 16, 18 fitted with blades 17, 18a, and feed rollers 19, 20 driven faster than the rollers 16, so as to assist in separating the cut sheet from the web. The cut sheet is fed in register along guides 33 to an intaglio printing- couple 43, 44, Fig. 5, by means of a cam-operated reciprocating hook 32, and from the printing- couple the printed sheet is delivered by rollers 47, 48 and an oscillating hook 49 on to pivoted guides 50 on oscillating shafts which cause the guides to move from under the sheet, which thus falls on to the upper surface of spirals 54. The sheets descend on these spirals, and the bottom sheet is fed to the next couple by means of projections 57 on chains 58, and oscillating hooks 59. Specifications 190,202; and 252,278, [Class 100 (i), Feeding and delivering webs &c.], are referred to in the Provisional Specification. Tripping-arrangements.-The feed rollers 14, 15 are tripped automatically in case of breakage of the web, by raising the roller 14 against the action of springs 32. The web passes between a pair of spaced rollers 23 and a spring-pressed roller 13, which-moves into the space between the rollers 23 if the web breaks. This movement of roller 13 causes an oscillating hook 25 to engage a pawl 26 on a lever arm 29, the shaft of which is fitted with a cam which raises roller 14 out of action. If a short sheet is cut from the web after a break has occurred, this is discarded by a reciprocating finger 41 coacting with a pair of spaced rollers 40. This finger does not affect the feed of a normal sheet which is received by the rollers 19, 20 before the finger 41 acts. The printing-rollers may be controlled similarly to the rollers 14, 15, so as to prevent the rollers from contacting when a blank is missing. Reference has been directed by the Comptroller to Specification 17148/05.