US288081A - Device for stippling - Google Patents

Description

DEVICE FOR STIPPLING, SHADING, OR TINTING PRINTING STONES 0R PLATES.

No. 288,081. Patented Nov. 6, 1883.

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nventor Z14 gfr/ 2% i l i l l l 1 I printing stones and plates.

Unirno Sr T EsPA-T NT OFFI E.

CHARLES C. MAOBRAIR, OF CINCINNATI, OHIO.

' DEAVICE For STIPPLING, SHADING, OR TINTING PRINTING STONES 0R PLATES.

, SPECIFIOATIQN forming part of Letters Patent No. 288,081, dated November 6, 1383.

I Application filed manic, 1853. no model.)

To raZZ whom it may concern:

i useful Improvements in Devices for Stippling, Shading, or Tinting Printing Stones or Plates,

of which the following is a specification.

My invention is in the nature of an improvement upon devices for the production of stip;

ple, line, orwavedshading or grain work upon A Ihe'purposes'and previously-existing meth o'ds for the production of stipple, line, waved,

or grain shading upon printing-surfaces are fully described in several Letters Patent of the United States andof Great Britain, but with more perspicuity and detail in United States I Patent No. 214,493,0fApri122, 1879, to Benjamin-Day, to which patent I shall have occa sion to refer in pointing out thepractical men its of my invention.

My invention has for its object the production of a device for stippling, line-shading, or

rgraining printing surfaces, which shall .de-.,

velopupon such surfaces the desired effects in shading and varying the lights with great,

or accuracy and facility than any ofthe de-,

vices previously in use, and which shall be adapted to the largest work, as circus-posters,

equally as well as to the smallest card-work. The present devices ormet-hods can be used successfully only in small work, for reasons given hereinafter.

Toaccomplish my object I construct apressure-roll,of any desired or convenient size- -as, for instance, (fonlarge work,). of twoand one half inchesdiameter and'twcnty-fourinches wood, hard rubber, or metal-and upon this long-'mounted upon a shaft or spindle in a suitable frame, for use by hand, which roll is made of an unyielding or firm material-as pressure-roll I place a transfer-sleeve ofany suit-able yielding materialas fine glue or gelatine, and glycerine-upon the external surface of which sleeve is produced in relief, by means of a corresponding matrix or mold, any kind oi'stipple, line, waved, or grain design for shading. lhe internal diameter or bore of this sleeve is suflici'ently less than the external diameter of the roll upon which-ibis mounted, that when drawn over or upon the latter it will adhere to and revolve with it.

The thickness of the transfer-sleeve is such therequisite shading effects upon the printing stone or plate.

The principal use of my device is in the preparation of stones and plates for lithographprinting.

In the accompanying drawings, Figure 1 is an elevation of myimproved transfer or printing roll. Fig. 2 is a transverse section on the line as m of Fig. 1. Fig. 3 is a transfer-sleeve developed upon aplane, showing three different kinds of shade effects impressedor mold ed in relief thereon, although only one of a kind will be used on the same sleeve. Fig. 4 is a cross-section, at right angles to axis, of the transfer-sleeve; and Figs. 5, 6, 7, and 8 are illustrations of some of the shade eiiects produced upon a printing-surface.

parts.

A is a frame, (preferably of cast or wrought iron,) provided with arms a a and handle a. The arms a a are furnished with bosses, to form bearings and receivethe journals of the shafts or spindles b and d of the pressure-roll B and inking-roll D, respectively.

B is the pressure-roll, of an unyielding material-as wood, hard rubber, or metalthe surface of which is truly concentric with the journals ofshaft b, and of uniform diameter from end to end.

.G is the, yielding transfer-sleeve, cast of a composition of fine glue or gelatine and glycerine, in a suitable mold, which shallproduce in relief upon the external surface thereof the desired stipple, line, or waved shading, as in- Fig. 3, only one of which kinds of shading, however, is admissible upon any one roll, and the internal surface or bore of which shall be smooth and of a diameter somewhat less than the diameter of the pressureroll B, so that maintain the sleeve in condition to produce Similar letteis of reference indicate similar r Fig. 5, stipple in Fig. 6, waved or curved when the sleeve 0 is drawn upon the roll'B it shall adhere to and revolve with the latter.

The sleeve O,'being cast'as" an independent member of the device, and removable from the roll B, any number of these, each having a dif-- ferent form or variety of shade, stipple, or

lines impressed thereon, may be made and used with a single roll.

D is an inking or feeding roll of the kind usually employed for supplying ink to a formin an ordinary printing-p'ress, mounted in the frame A, over the roll and sleeve 13 and O, which roll D is charged with transfer-ink for the preparation of printing stones and plates. In large devices of my design the weight of the feed-roll D will be sufficient to producethe shading in Fig. 7, and as a graduated tint in Fig. 8, which latter effect may be produced either byvarying the pressure on opposite ends of the roll B and sleeve 0, when in use, or by casting atransfer-sleeve with a series of graduated stipple or line work upon the surface thereof.

The object of this class of work in the preparation of lithographing stones or plates has been so fully described in former patents of this and other countries, andis so well known to the craft, that any extended description here is not necessary to a proper understanding of my invention.

Referring to the objections to all previous devices for this purpose with which I am familiar, films such as are described in Days Patent, No. 214,493, and in other patents, can be I used successfully only of small sizeyowing to the deteriorating effect of changes of temperature upon the composition entering into the film, causingit to expand and buckle ili warm weather and to contract unevenly and possibly tear in cold weather, and as the film must be of same'thickness, however large, to produce the desired effects, these objections, together with the necessity of repcatedlyremoving and reinking the film by hand to produce deeper tones or tints, are sufficient to defeat its use upon a larger-surface.

WVhen large surfaces are to be shaded with the fiat films, they (the films) must be set over the figure several times, care being had that the joints of the shade-work shall register perfectly. Thus in shading or toning a'sur-' face eighteen by twenty-four inches with a fiat film six by eight inches it must be set over the figure on the stone or plate no less than nine times and possibly more than this number of times if deep tones are required 'lup'on-p'ortions of the figure. This transferring of the film from place to place over a large stone or plate requires great skill and considerable time, all of whichis avoided by my improved device, which may be large enough to cover theentire figure or plate at one sweep. v

In using my improved transferring device such portions of the figure as do not require tinting or shading are stopped out'by an 'overlay of thin paper out to the form of so much of the figure as requires high lights; or the entire figure may be tinted and the high lights scraped out. To increase the depth of tint or shade the roll is passed over the figure repeatf edly, successively stopping out with a solution of gum and acid or an overlay of paper so much of the figure as has been given the proper tone or shade.

By means of the feed-roll D, to supply ink to the transfer-sleeve C, any amount of surface-representing several complete revolutions of the lattermay be made with a Tuniform effect upon the figure being worked,

'I am aware that printing-films or transferring-films, for the shading ortinting of fig ures by means of pressure by a platen-press, or by the abrasive action of a stylus upon the back thereof, are not new, and these I do not claim.

I am also aware that it is not new to employ a roller having molded. thereon a covering of printer s composition perforated for coloring the edges of the books; nor to employ, for marking purposes, a roll having a rubber-coated cloth band with type-letters on its surface, secured thereto by a wedge set into a longitudinal groove in the roll, so as to take up the slack of the band, a second roll being used to apply ink to the marking-roll; nor to construct a hand-stamp of two rolls, one being the marking-roll covered by a rubber band having printing-letters thereon, the

' other being used to apply ink to the markingroll. The rubber-surface is too hard for my purpose, and the yielding surface must be detachable, so that different designs may be applied to the same roll.

Having described my invention, what I claim In adevice for shading or tinting figures on printing stones or plates, the combination, with a frame and an inking-roll and transfer-roll, of a detachable sleeve to the transfer-roll composed of a yielding material, such as glue or gelatine and glycerine having the desired design in relief on its external surface, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to the foregoing specification in the presence 'of two subscribing witnesses.

CHARLES o. MAcBRA R'.

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