Patent GB-189718740-A (GB)
Title: Improvements in Rotary Web Printing Machines and Collecting and Folding Mechanisms connected therewith.
Inventor: MARKS GEORGE CROYDON
Filed: 1897-08-12
Granted: 1898-07-09
Abstract: 18,740. Marks, G. C., [Campbell Printing Press and Manufacturing Co.]. Aug.12. Drawings to Specification. Rotary machines.-Relates to improvements in various mechanisms of rotary web machines, and collecting and folding mechanisms connected therewith. (1) The first improvement relates to means for introducing a fresh roll of web to the machine without losing time. The new web-roll is centered and secured by cones &c. upon its shaft, and the shaft is then placed in notches in the framing so that the roll is near the expiring web-roll. A portion of the new roll is unwound, and the end engaged on a toothed bar and pasted by hand or suitable mechanism. The old or expiring web is being drawn off and fed to the printing-machine by a feed drum and tapes ; by operating a handle the toothed bar, which is on pivoted arms, carries the pasted end of the new web into the bite of the feed mechanism and at the same operation a pivoted knife is moved to engage and sever the old web. The old web-roll is then removed and the new one rolled down into its place. A means for adjusting laterally and braking the web is described. Mechanism is also described for moving the new roll into position and removing the old one by means of travelling chains which have brackets engaging the shafts of the rolls. (2) Controlling-mechanism for regulating the tension of the web and for stopping its supply in case of breakage. The shaft of the web-roll operates a pump, preferably a rotary one, which circulates water or other incompressible liquid. In the circuit of pipes are valves operated by devices acted upon by the web at various parts of the machine, so that the valves are more or less closed or throttled according to the tension of the web. If the web breaks, one or other of the valves are closed by a weight so that the web-roll is held from turning and the supply of web is stopped. (3) System of fluid-pressure brakes for stopping the parts of the machine and controlling its speed. The shafts of the web-roll, printing and impression cylinders, ink drums, and folding-apparatus are provided with brakes operated by pneumatic diaphragms in casings connected to an air-service pipe, supplied from a pressure pipe connected with a reservoir in which pressure is maintained by an air pump. A tension roller resting against the web operates a valve by which the brake on the web-roll is controlled to regulate the tension. Resting on the web are also rollers which control valves in pipes connecting the pressure pipe and the service pipe, so that in case of failure or breakage of the web air is admitted to the service pipe and the brakes are applied. Branch pipes lead from the pressure pipe and service pipe to a main controlling-valve, in connection with which is an air cylinder operating a belt shifter. The controlling-valve may be adjusted so that the brakes and bell shifter will be actuated simultaneously or as desired. (4) Means for conveying ink from the ductor roller to the inkdistributing rollers. Mounted on revolving plates or brackets, so as to revolve in an orbit, are rollers or pairs of rollers which contact with and take up ink from the ductor roll and supply it to the distributing-rollers as they pass them. The gearing is preferably so proportioned that there will be no slipping of the rollers while they are in contact. (5) Inking-arrangements, and means for maintaining the ink supply at a constant temperature. The ink-distributing mechanism includes a series of distributing-drums of different diameters, preferably increasing in size from the first drum to to the last. Two ink-fountains may be used with means for moving them or putting either into cooperation with the transferring-roller. Pipes are provided for circulating water through the distributing-drums. The water is supplied from a cistern, and may be heated by gas jets to any desired temperature on its way to the drums, or it may be used cold. (6) Rotary switch for directing sheets as required for associating &r. in the delivery apparatus. The switch consists of segmental pieces or fingers on a shaft carried by revolving arms provided with counterweights. By timing the revolutions of the arms the switch may be made to direct every second or other sheet to a collecting-cylinder &c. By turning the shaft carrying the fingers or segments, the switch may be thrown out of operation. The switch is described in connection with a folding and delivery apparatus adapted for dealing with a printed web. (7) Rotary folding-mechanism. The fold is tucked, by a revolving blade, into a pair of rollers mounted on the periphery of a drum. The rollers are carried by end discs, driven independently of the drum, and the rollers are rotated by pinions on their ends engaging toothed wheels on the drum. Two or more pairs of rollers may be mounted on each drum. The folded sheets pass out of the rollers on to delivery tapes. The folding-mechanism is described in connection with a folding and delivery apparatus.