Patent GB-191330069-A (GB)
Title: Improvements in Printing Presses.
IPC: B41F1/00
Filed: 1913-12-31
Granted: 1914-12-31
Abstract: 30,069. Grover & Co., and Patient, J. Dec. 31. Platen machines; bed-reciprocating apparatus; tripping-arrangements; inking-apparatus.-Relates to a platen press for printing on a continuous web by a forme carried on a reciprocating carriage, which remains stationary at the end of its forward stroke while an impression head descends to press the forme against the web extending over a fixed platen. A sliding carriage 5 carrying the forme or plate 4 is reciprocated positively in both directions, the first part of its forward and the latter part of its rearward motion being effected rapidly by one or more racks 6 engaging one or more wheels 6<1> on an oscillating shaft 7, and the latter part of its forward and the first part of its return movement at a relatively reduced speed. The carriage is thereby brought without shock against stops 10 on the impression head 11. The slower motion is effected after the racks 6 have passed out of gear with the wheels 6' by a crank 12 on the shaft 7, the shaped pin 12<2>, Fig. 5, of which passes into a slotted-bearing end 13<1> of a link 13, mounted by slots on a rod 14 on the carriage 5 and drawn towards the rod by springs 15. Owing to the crank motion, the speed of the carriage is gradually reduced until the carriage engages the stop 10, the further small swing of the crank merely extending the spring 15 and permitting the carriage to remain stationary while the impression head descends. The crank 12 is fitted with a segment 12<3> which depresses the end of the link 13 against an abutment 4<1> on the carriage and forces the crank-pin out of engagement. The wheels 6<1> are preferably detachably secured to disks fixed on the shaft 7, which is oscillated by a pinion 6<2> engaging a rack 8<1> reciprocated by a crank 9 on the main shaft 1. The impression head 11 is carried on arms 11<1> pivoted at 17 and is raised and lowered by a link 27 from cam-operated levers 25, 28, the link being connected to a cross-bar 23 which is connected to the outer ends of arms 11<1> by adjustable rods 20 surrounded by lifting-springs 18. The actual impression pressure is effected by a crank-pin 9<2> and links 30 with slotted ends 30<1> engaging a pin 31 on the head 11. The impression may be arrested by fitting the pin at each end with eccentrically-mounted bearing-portions, which may be turned collectively by an arm 31<2> so that the ends of the slots in the links 30 will not bear on them, and a connexion may be provided whereby such movement of the arm 31<2> laterally displaces the lever 28 out of engagement with its normal operating-cam and into engagement with a cam imparting less movement. The operation of the trip-arm 31<2> to arrest the impression may also render the device for drawing the web through the machine inoperative. The web is unrolled from a roll 32 by a roller 41 to form a loop B', and passes through guides and over the platen 16 and roller 39 to a wind-up roll 40. The inking-apparatus is mounted on a stationary part of the machine with provision for adjustment, and the axes of the forme rolls and distributing-roll are stationary relatively to one another. The fountain roll is driven by ratchet gear 90<1> and a rod 101 from a crank-disk 102, and supplies ink to a messenger roll 91 which, through a roll 92, conveys it to a composition roll 93, a further messenger roll 94 and composition roll 95 conveying it to a drum 34, which distributes it to the forme rollers 35 mounted in adjustable bearings. The drum 35 is oscillated from the shaft 7 so that its surface speed and that of the forme rolls are the same as that of the forme when driven by the rack 6 and wheel 6<1>. The messenger rolls are operated by rods 97, 99 from a lever 96 oscillated by a cam on the shaft 46, and the fountain roll is provided with a hand-wheel to turn it for starting up or cleaning.