Patent GB-415385-A (GB)
Title: Improvements appertaining to driving gear and adjustable bearings for the inking anddistributing rollers of off-set printing machines
IPC: B41F31/30
Filed: 1933-02-20
Abstract: 415,385. Printing - machines. WAITE & SAVILLE, Ltd., Falcon Works, and WHYTE, F., The Evergreens, both in Otley, Yorkshire. Feb. 20, 1933, No. 5122. [Class 100 (ii).] Driving-gear for the inking and distributing rollers of offset printing-machines comprises three sets of gear independent of the gear for the printing-cylinder, one set for rotating the duct roller, and those rollers intervening between it down to and including the reciprocating ink-distributing cylinder or roller, having the driving-gear on the outside of one end frame of the machine, the other set for rotating the remainder of the rollers intervening between the printing-cylinder and the inkdistributing cylinder having the driving-gear within the two end frames of the machine, and the third set of gear for imparting the reciprocating motions to any desired roller being arranged on the outside of the opposite end frame to that of the first set of gear. Ink is taken from the duct-roller 2, Fig. 1, by a messenger-roller and transferred to a roller 2<a> which transfers it to the distributing- cylinder 4<a> through the intermediate rollers 3, 3<a>, 4. The cylinder 4<a> passes on the ink to the printing-cylinder 10 through sets of rollers 5, 7<a>, 11, 12 and 5, 6<a>, 8, 9. The rollers 2<a>, 3<a>, 6<a>, 7a and cylinder 4<a> are reciprocated longitudinally and are rotated by gear, but the rollers 3, 4, 5, 8, 9, 11, and 12 are driven by frictional contact, and are not reciprocated. A main driving-shaft 13 drives, through gear-wheels 14, 16 mounted on the outside of one frame A of the machine, a shaft 15 which extends between the two frames of the machine. The gear-wheel 16 drives a gear-wheel 17 adapted to clutch in known manner a member on the shaft 4b of the cylinder 4<a>, and the latter drives the rollers 6<a>, 7<a> respectively through the trains of gear-wheels 18, 19, 20, 20b, 6<b> and 18, 19, 21, 21b, 7<b>, these trains of wheels being situated on the inside of the frame A of the machine. A gear-wheel 25 loosely mounted on the shaft of the ductroller 2 is driven from the shaft 13 by gearwheels 24<a>, 24, 2<c>, 23, 3<c>, 22, 17, 16, 14, all of which are on the outside of the frame A of the machine. The mechanism for longitudinally reciprocating the rollers 2<a>, 3<a>, 6<a>, 7<a> and cylinder 4<a> is situated on the outside of the opposite frame of the machine, and is actuated from the shaft 15 on which is mounted a spiral gear-wheel 26, Fig. 3, in mesh with another spiral gear-wheel 27 secured to a shaft 28 at right-angles to the shaft 15. The shaft 28 carries eccentrics 2<w>, 3<w>, 4<w>, 6<w> adapted to actuate levers 2<x>, 3<x>, 41<x> (not shown), 6<x>. The levers 2<x>, 3<x> are pivoted loosely on a shaft 29 which is parallel to the shaft 28, and engage the grooved hubs on the shafts of the rollers 2<a>, 3<a> to reciprocate the rollers in the usual manner. The lever 41<x> operates a pivoted lever 4<x> which reciprocates the distributing-cylinder 4<a>, and the lever 6<x> is fixed on the shaft 29 in order that the latter may be oscillated to reciprocate the rollers 6<a>, 7<a> through the medium of levers 61<x>, 71<x> secured to the shaft 29. The bearings of the rollers 6<a>, 7<a> are open at the top, to facilitate removal of the rollers. Means for adjusting the rollers 8, 9, 11, 12 in contact with the rollers 6<a>, 7<a> and the printing-cylinder 10 includes roller shaft bearings 43, Fig. 7, situated in the bifurcated ends of brackets 44 mounted upon adjustable framework 45 situated on each side of the machine, and raised and lowered by the usual cam devices 46. The upper end 45<a> of each framework 45 is of semicircular shape, of a radius equal to the radius of the cylinder 10, and the brackets 44 can be adjusted along the upper end of the framework, as is usual. Minute adjustments of the bearings 43 can be made by adjusting-screws 47, and by providing on the bolts which secure the brackets 44 to the framework 45, eccentrics 48 which engage in recesses in the brackets and can be adjusted, when the nuts of the bolts are slackened, by milled-headed extensions to adjust the positions of the brackets relatively to the framework. The duct-roller 2 is driven from the gear-wheel 25 by a pawl 51 thereon adapted to engage one or the other of two teeth 52, 52<a> formed on a disc 53 secured to the shaft of the roller 2. The two teeth on the disc 53 are such that ink picked up from the duct by the roller 2 will be transferred to the rollers 8, 9, 11, 12 when the blank part of the printing- cylinder 10 is passing these rollers, in order that the thickness of the ink taken up by the cylinder 10 shall be as even as possible.