US321743A - milligan - Google Patents

Description

(No Model.) J. MILLIGAN, Deod-l :asneets-sheen 1.

E. R. MILLlGAN, Exeutrix. PLATE PRINTING MACHINERY.

No. 321,743. Patented July 7, 1885.

(No Model.) J- MILLIGN, Ded- 2 heets-sneen Executrix.

PLATE PRINTING MACHINERY.

E. R. MILLxGAN,

NITEDr VSTATI-3s PATENT Brien.

EXEOUTRIX'OF SAID MILLIGAN, DEOEASED.

PLATE-PRINTING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 321,743, dated July 7, 1885.

(No model.)

To all whom it may concern,.-

Beit known that lI, JAMES MILLIGAN, of Brooklyn, Kings county, New York, have iuveuted 'certain Improvements in Plate-Printing Machinery, of which the following is a specification.

My invent-ion relates to wipers for power plate-printing presses; and it consists in a wiper constructed, arranged, and combined as more particularly pointed out hereinafter.

In the drawings,Figure lis a sectional view showing one of my improved wipers. Fig. 2 is a plan of Fig. l; Figs. 3 and 4, sectional views illustrating modifications.

In my improved wiper I use a single pad, A, consisting` of a strip of felt or other suitable yielding materiahand appliances whereby said pad may be sov adjusted as to secure an increased pressure upon the plate as it travels beneath and in contact with the wipingcloth. rlhis pad is set in a suitable frame, B, to which an elliptical, zigzag,or other suitable motion is imparted by means of eccentrics or cranks c, carried by Vertical shaftsb,or otherwise, so that the wiping-cloth,which is carried from a roll, d, to a roll, rl, over the face of the pad, will have about the same movement that is imparted to the cloth in hand-wiping.

In hand-wiping it is customary to iirst remove the mass ot' ink from the plate with a comparatively clean cloth. A clean cloth, however, cannot be employed for the final wiping, as it would wipe out the engraved lines. For this reason I feed the wiper-cloth across the face of the pad in the same direction as the plates travel,so that the plates will pass under the pad first in contact with the fresh cloth, and then with that which is inked or fat.7 It is also considered essential that as the wiping progresses the pressure of the cloth upon the plate shall increase, for which purpose, in a former application for Letters Patent, I described a wiper in -which were combined anumber of pads set at difterent heights or backed by springs adjusted so that the pressure upon the plate would increase as it passed beneath the wiper. In passing under a wiper so constructed the plate meets successively the edges of the diii'erent pads, and there is more or less tendency to wipe out felt or other suitable 1naterial,over which may.

extend the leather facing e, traversed by the cloth, and behind this pad is arranged a number of strips or blocks, C, each of which is vertically adjustable by means of bolts f, cxtending from the blocks through holes in a bridge, g, and provided with heads i t", which limit the dowuwardly-vertical movements.

It is very desirable that the.pad have a spring-backing, so that it can yield slightly under pressure, for which reason I interpose rubber or other springs between the pad and its bearings. For instance, I may use coiled springs n, resting upon the blocks C, and setscrews h,passlng through a bridge, 7c,by which the pressure of the spring may be varied so as to cause the forward edge of the pad to press more lightly upon the plate than the back edge. 'A like result may be secured by using a single backing-block, C, as shown in Fig. 3, and either adjusting the same to an angle to depress the rear edge or by keeping it level and facing it with strips m of felt set to secure increased thickness at the rear,with a corresponding gradual increase of pressure. In this structure springs n may be interposed between the block and an adjustable plate, H, the backing being limited in its vertical movement-s by headed screw-bolts f, as shown. A greater .variety of adjustments may be secured by using a backing consisting of numerous blocks, each having a spring-backing, as shown in Fig. 4. Vhichever may be the construction adopted, the pad is in one picce,and springs are applied and the backing is made or set so as to secure a gradually-increasing strong pressure upon the plate, but without the presentation of any abrupt edges, the pad interposing such a mass of elastic material between the edges of the backing blocks or strips and the plate as serves to reduce their sharpness and secure a practically inclined IOO plane at the under face of the pad Without ridges.

'It will be apparent that other adjusting devices than screw-bolts may be employed for adj usting the backing. I therefore do not limit myself to the use of these devices for the purpose.

I do not here claim the combination, with the wiper-pad,of a cloth traveling in the same direction as the plate; nor the combination with such wiper and cloth of reciprocating devices; nor devices for adjusting the 'sections of a wiper-block to different heights, nor for affording yielding bearings therefor j and for regulating the pressure of such bearings, as these features are embodiedin my application, filed October 2l, 1880, Serial No. 19,282.

1. A wiper for plate-printing presses, consisting of a single pad, springs, and a backing set to secure a gradually -increasing spring-pressure toward the back of the pad, and a cloth traversing the face of the pad, substantially as set forth.

2. The combination of a single wiping-pad, a backing constructed to secure increased pressure as the plate passes beneath the pad.

adjustable spring-bearings for the backing, and appliances for reciprocating the pad in .respect to the plate,substantially as specified.

3. Thecombination,in a mechanical wiper, of a single pad, abacking consisting of a series of pieces, and means for adjusting said pieces to different heights, substantially asset forth.

4. The combination of the single pad, the backing, adjustable devices for limiting the vertical movements of the latter7 and springs interposed between the backing and its bearings, substantially as specified.

5. The frame carrying a backing consisting of a series of independent pieces and a single pad extending below the same, in combination with devices for adjusting the 'pieces inde pendently, and with spring-bearings and dcvices for varying the pressure of the springs, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two sub scribing Witnesses.

JAMES MLLIGAN.

W'itnesses:

GHARLEs E. Fosrnn, H. E. HANsMANN.

Images