US1969942A - Ink distributing mechanism for printing machines - Google Patents

Description

1934. TIE. PHYTHIAN 1,969,942

INK DISTRIBUTING MECHANISM FOR PRINTING MACHINES Filed Sept. 24. 1931 2 Sheets-Sheet l Inventor Attorney.

Aug. 14, 1934. T. E. PHYTHIAN INK DISTRIBUTING MECHANISM FOR PRINTING MACHINES Filed Sept. 24, 1931 2 Sheets-5heet .lttorney.

Patented Aug. 14-, 1934 UNETED STATES rarest orrics INK nrs'rnmu'rmo MECHANISM FOR PRINTING Machines Thomas Ewart Phythian, Headingley, Leeds,

England 4 Claims. ((31. 101349) This invention relates to ink distributing mechanism for printing machines of that kind in which a cam disposed upon the same axis as the ink distributing drum is adapted to cause the 5 reciprocation of the ink distributing rollers. ,.In such a type of ink distributing mechanism the ink distributing rollers follow each other in their movement to an extent dependent upon the distance between the centres of the rollers and the pitch or distance between the centres of the waves in the cam, and the ink is imperfectly distributed.

The invention has among its objects to provide for the effective distribution of ink upon the ink drum.

According to the invention the cams employed are adapted to effect the reciprocation of the respective ink distributing rollers once on each rotation of the cam, and for the purpose each cam :0 is provided with a cylindrical periphery and the pitch of the cam ridge or groove thereon is relatively wide whereby a considerable extent of reciprocation results at each rotation of the cam.

According to the invention moreover two such cams are provided one at each side of the printing machine and respectively between the frames and the ends of the ink distributing drum; and according to the invention the cam ridge or groove is so disposed on the respective cams that alternate ink distributing rollers are adapted to be moved in opposite directions, that is to say, the cams may advantageously be set at 180 plus or minus the pitch of the ink distributing rollers with respect to each other, and the respective runners by which engagement is made with the cam ridges or grooves of the two cams are thus mounted at opposite ends of adjacent ink distributing rollers.

According to the invention, moreover, the cams are operated so as to have an angular velocity different from that of the ink distributing drum. Thus for example the respective cams may rotate once only for four revolutions of the ink distributing drum, or the angular velocities may have any other different relation. Thus the re- Figure 1 is an elevation partly in section.

Figure 2 is a cross-sectional view.

In carrying the invention into effect according to the construction as illustrated in the accompanying drawings, the respective cams a are provided with cylindrical peripheries and advantageously with an endless helicoidal ridge a of a cross-sectional shape corresponding to gear wheel teeth with straight inclined sides, the ridge a being disposed at such a uniform inclination as to extend from one edge or side of the cam a to the other. The respective cams a are mounted freely to rotate upon the shaft 2') of the distributing drum b in positions respectively between the ends of the drum b and the sides of the machine frame. A stationary ring c is advantageously mounted upon the respective inner faces of the frame sides with internal teeth c to gear with a pinion d (or a number of pinions) mounted upon a stud d or studs disposed parallel .75 With the axis of the shaft 73, the stud d or studs being carried at the end upon the web part of the respective earns a, while concentric and integral with the pinion referred to is a pinion d of larger diameter disposed adjacent the cam, '80 that is adapted to engage a pinion e keyed to the shaft b of the ink distributing driun. Thus the drive is imparted from the pinion e that is keyed upon the shaft 1) of the ink distributing drum b to the pinion or pinions d in enaagementss with it, the movement of which is communicated to the integral smaller pinion at whose teeth are in engagement with the internal teeth on the adjacent stationary ring 0, it being understood that the peripheral part of the cam d overhangs so as to cover the larger pinion or pinions d of the set of integral pinions referred to. By such means the drive is eifected through the pair or pairs of integral pinions d, d to the earn a and inasmuch as the spindles of the ink distributing rollers are only permitted an axial movement the rotary movement of the cam ridge (1 causes the reciprocation of the respective ink distributing rollers whose runners f lie n engagement with the cam ridge a The cams a are so dis-1100 posed that the cam ridges a are set in substan tially opposite positions, that is to say, the cam at one side is set at an angle of 180 plus or minus the pitch of, or distance separating, the ink distributing rollers to that at the other side, so that .105 by such means if each alternate ink distributing roller j be provided to be reciprooated by the same cam, adjacent rollers are reciprocated in opposite directions, it being understood that as the cam ridge is continuous and of helicoidal form extending from one side of the cylindrical periphery of the cam to the opposite side, a long stroke is imparted to the ink distributing rollers.

The pairs of integral pinions are advantageously mounted upon ball bearings and the gearing is so determined as to give approximately one revolution of the respective cams to foi1r revolutions of the ink distributing drum. The respective ink distributing rollers have runner's' mounted upon the ends at which connection is made with the cam, the groove of the runners corresponding in sectional form to that of the seasonal form of the cam ridges.

1. Ink distributing mechanism for printing machines, comprising a rotatable ink distributing drum, a plurality of ink distributing rollers co-operating with the said drum, a pair of H)"- tatable cams coaxial with but separate from the said drum, the said cams directly engaging and reciprocating the distributing rollers in groups and being positioned with a relative angular displacement determined by the distance apart of adjacent distributing rollers so that the adjacent distributing r'olle'rs are reciprocated in opposite directions from different cams throughout the movement of rotation of the drums, and means foreflecting a differential movement of the cams with respect to the drum.

2. Ink distributing mechanism according to claim 1, wherein the cams being cam surfaces adapted in one revolution of the cams to give one change of direction of movement to the distributing rollers operated thereby, the said cams being so relatively disposed that adjacent ink distributing rollers are moved always in opposite directions.

3. Ink distributing mechanism according to claim 1, comprising a rotatable shaft upon which said distributing drum is fixedly mounted and said cams are rotatably mounted, frame elements in which said shaft is supported, and gearing connecting said cams with said shaft, said gearing being wholly on the inner side of the frame elements,

4. Ink distributing mechanism according to claim 1, comprising a shaft upon which said ink distributing drum is fixedly mounted and said cams are rotatably mounted, and gearing for each cam comprising a pinion carried by said shaft, a toothed crown of fixed position co-axial with said shaft, and two pinions in fixed relation respectively in engagement with said crown and said pinion and carried by said cams.

THOMAS EWART PHYTHIAN.

Images