US2203848A - Inking arrangement of platen printing presses - Google Patents

Description

June 11, 1940. F. s. THOMPSON INKING ARRANGEMENT 0F PLA'IEN PRINTING PRESSES Filed Nov. 2, 1938 2 Sheets-Sheet 1 INVENTOR a/ r3 7 /J & BFYRANK svnNEYTuonPsou AT T 0R NE Y Patented June 11, 1940 INKING ARnANGEMENroF PLATEN PRINTING PRESSES Frank Sydney Thompson, Manchester, England, assignor to T. C. Thompson & Son, Limited,

Manchester, England Application November 2, 1938, Serial No; 238,312

In Great Britain December 1,1937

zciaims. (01. 101-340) .1

This invention has reference to the inking ar rangements of platen printing presses, of the kindwherein a rider or smoothing roller arranged to travel with the inking rollers and to rotate in contact. with one or more. of them has imparted to it an axial to-and-fromovement or reciprocation relative to the inking rollers to ensure uniform inking of the type and .wipe out marks.

In the inking arrangements of platen printing presses it is common practice to utilise the rotation of the inking rollers or their runners or of therider rollers themselves in conjunction with some form of scroll or screw-and-nut mechanism to effect the to-and-fro movement or reciprocation of the rider rollers. Such arrangements have to be keptsmall to avoid undueweight which is an objection especially in the case of a fast running machine. Further, where a revolving drum isused to supply the ink to the inking rollers (which arrangement considerably reduces the oscillatory travel of the rollers) the revolutions of the inking and rider rollers in their two directions are unequal which necessitates the provision of compensating slip means when the inking rollers are revolved by the drum, and if the drum revolves the rollers in the direction of their downward or inking run (as should be the case) the arrangement is sometimes inefiicient owing to rockable member or members pivoted on one or' both of the swinging arms which carry the inking rollers and adapted to be rocked about its or their 45 pivot or pivots. during the oscillations of said arms.

In the accompanying drawings Fig. l is a fragmentary side view and Fig. 2 is a like plan of a platen printing press comprising one embodiment to of theinvention, Fig. 3 is a side view to a larger scale of one of the end brackets in which the inking and rider rollers are mounted and the a. sociated .rod, hereinafter more particularly referred to, for axially reciprocating the rider roller, 55 Fig. 4 is a plan partly in section of the bracket and Fig. 5 is'a view also partly insection of the bracket looking on the left-hand side of Fig. 3.

Referring to thedrawings, 6, 1 indicates the side frames of the machine, 8 indicates the fixed platen on which the type is mounted and 9 indicates the movable platen which carries the sheet to be printed. In the side frames 5, 1 arms II], II are pivoted at l2, l3 about which latter the arms are oscillated by means of links It (Fl-g. 1) and m cranks l5 fixed on a shaft M which is suitably driven from the main shaft of the machine. In T the arms Ill, 1 I, which are of channel section, are slidably mounted rods ll, it which have mounted on them springs I9, 26 thrusting between the ends 10a, Ha, of the arms and collars Ha, 18a, fixed on the rods I1, I8 so as to urge the latter inwards.

The outer ends of the rods ll, l8 carry saddles or hooked brackets 2|, 22 which are rockably mounted on pivots 23, 24. The ends of the rods 20 l1, H! are formed with tongues llb, 3b, which take into slots 2m, Fig. 5, in the saddles or brackets 21, 22. The pivots 23, 24 are formed.

with collars 23a, 24a, which are secured to the saddles or brackets 2|,22 by screws 2| b, Fig. 5, 5

and also with extensions 231) on which lugs 25, 26 are mounted and secured by nuts 23c, 240.

The spindles 21a, 28a of the inking rollers 21,

28 are rotatably mounted in the saddles or brackets 2|, 22 and between the inking rollers a rider roller 29, adapted to be pivotably rotated by and in contact with said rollers, has its spindle 29a slidably mounted in the lugs 25, 26.

On the oscillatory arm ID the shorter arm of an Lshaped lever 30 is pivoted at 3!. In the longer arm of the lever 30 is slidably mounted a rod 32 having its outer end formed with a yoke 33 through which the spindle 29a of the rider roller 29 extends. The spindle 29a is retained in the yoke33 by a keep 34 and collars 35, 36 40 are fixed on the spindle one on either side of the yoke. At the junction between the arms of the lever 30 there is pivoted at 31 one end of a link 38 the other end of which is pivoted at 39, a little below the pivot [2 of the arm l0, in a bracket 40 fixed on the side frame 6.

During reciprocation of the arms II], ll between their extreme positions indicated by the dot-and-dash lines X, X Fig. 1, the inking rollers travel to and fro between the positions indicated in dotted lines at Y, Y and the rider roller 29 travels in thesame path as, and rotates in contact with, the inking rollers in the usual way. Owing to the eccentricity of the pivot 39 of the link 38 relatively to the pivot l2 of the arm ID, the pivot 3| of the lever 30 moves in arcuate path Z, Fig. 1, about the centre l2 while the pivot 31 of the link moves in the arcuate path Z about the centre 39. The effect of the relatively eccentric paths of the pivots 3|, 3'! is that during the downward movements of the arms Ill, H and inking rollers 21, 28 from the positions X, Y, Fig. 1, to the positions X Y the lever 30 is caused to rock on its pivot 3| and reciprocate the rider roller 29 away from the observer in Fig. 1, i. e. in the direction indicated by the arrow W in Fig. 2, and during the return movements of the arms In, H and inking rollers 21, 28 from the positions X ,Y Fig. 1, to the positions X, Y, the lever 30 is caused to rock on its pivot 3|, in the opposite direction to formerly, and reciprocate the rider roller 29 towards the observer in Fig. 1, i. e. in the direction indicated by the arrow W in Fig. 2.

When the inking rollers 21, 28 are in the position indicated in dotted lines at Y, Fig. 1, they contact with, and are frictionally driven by, and pick up ink from, the positively driven drum 4|. The drum 4| is driven and has ink supplied to it in the known ways.

The spindle 29a of the rider roller 29 is free to move laterally in the yoke 33 in order that it may partake of the pivoting movements of the inking rollers 27, 28 and the saddles or brackets 2|, 22 about thepivots 23, 24 of the latter, and so maintain itself in proper engagement with the inking rollers.

If desired the oscillatory arm I I may also have associated with it means as described for reciprocating the rider roller 29. In such case the pivot corresponding to the pivot 39 of the lever 38 will be arranged at a corresponding point above the pivot l3 of the arm II.

It will be apparent that by appropriate multiplication of the mechanism described, or coupling together two or more such mechanisms, two or more rider rollers may be given axial to-and-fro motions or reciprocations in union or independently of each other.

I claim:

1. In the ink spreading arrangement of a platen printing press, including a reciprocating member pivoted on the frame of the press and carrying a plurality of ink spreading rollers, an

L-shaped member one arm of which is pivoted at a point on said reciprocating member, the other arm of which is connected to one of said rollers, and a link pivoted at one end to the frame on an axis noncoincident with that of the reciprocating member and pivotally attached at its other end to the L-shaped member, whereby upon reciprocation of said reciprocating member a lateral motion is given to the one of said rollers relative to the others.

2. In the ink spreading arrangement of a platen printing press, including a reciprocating member pivoted on the frame of the press and carrying a plurality of ink spreading rollers, an L-shaped member one arm of which is pivoted at a point along the axis of said reciprocating member, the other arm of which is connected to one of said rollers and the juncture of the two arms of which is connected by a rod to the frame of said press in a vertical line with and below the point of support of said reciprocating member, whereby a lateral motion is given to one of said rollers relative to the others of said rollers.

FRANK SYDNEY THOMPSON.

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