US712099A - Printing-press. - Google Patents

Description

No. 7|2,o99. v Patented oct. 2a, |902.

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PRINTING PRESS.. (Application med Apr. so, 1990.) v

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Patented' oct. 2a, |902;

No. 7I2,099.

M. L. sEvEnY. PRINTING PRESS- (Application filed Apr. 30, 1900.)

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MELVIN L. SEVERY, OF ARLINGTON HEIGHTS, MASSACHUSETTS.

PRINTING-PRESS.

SPECIFICATION formingpart of LettersPatent No. 712,099, dated October 28, 1902.

Application filed April 30, 1900.

To aZZ whom it may concern:

Be it known that l, MELVIN L. SEVERY, a citizen of the United States, residing at Arlington Heights, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Printing- Presses, of which the following is a full, clear, and exact description.

The theoretically most perfect blanket for a printing-press consists of a diaphragm elastically and equally pressed upon every part of the printing-surface, While the most perfect means for applying an elastic'and equal pressure to such diaphragm consists of {luidpressure. In adapting Huid-pressure for a cylindrical impression member I have found that the intermediate portion of such cylinders tread upon the form is held down to its work with far less force than near the ends. This is owing to the fact that although the flexible diaphragm retains its circular lines under the inuence of the strong duid-pressure within, yet there is nothing to prevent the axial line of the cylinder from bowing away from the form. To overcome this axial orbodily bowing of the cylindricaldiaphragm, I apply one or more rigid cylinders opposite the tread of theimpression member,and henceovercome any tendency to distortion of the same other than from cylindrical to sectionally elliptical. I have, furthermore, discovered that a series of elastic rings positioned in such a manner as to form, in effect, a cylindrical impression-surface, when similarly held down to their work by rigid rotating members, produce a close approximation to the effect of my fluid-pressure cylindrical diaphragm, the essential idea being to hold down to theirwork along lines opposi te thereto a Series of annular elements adapted to resiliently persist in their circular contour.

Referring to the drawings forming part of this specification, Figure 1 is a transverse sectional elevation of my cylindrical fiuid pressure impression member and its confining-rolls. Fig. 2 is a longitudinal section of the same. v Fig. 3 is a face or peripheral View of a part of the cylindrical impression member. Figs. 4 and 5 are perspective views of two means for giving a hard printing-surface to said member. Fig. 6 is a diagram illustrative of the cushioning eect. Fig. 7 is a Serial No. 14,926. (No model.)

transverse section of my impression member composed of a large helical coil. Fig. 8 is a similar view of the impression member composed of a series of annuli. Fig. 9 is a longitudinal section of the construction illustrated in Fig. 7. Fig. 10 is a longitudinal section of the construction illustrated in Fig. 8. Fig. 11 is a longitudinal section of a different modiiication still. Fig. 12 is a transverse section showing another form of the fluid-pressure surface, and Fig. 13 is another view of the same.

In the construction illustrated in Figs. 1 and 2 the diaphragm lis secured at its edges to the ianges 11 of the cylinder 10, thus forming an annular space for the reception of the iiuid under pressure. Such uid is forced into said annular space through the channels 13 from the tube 14, and it may be compressed air or similar gas or a heavy liquid, as water or mercury, freely resting in the said space and tube 14, the latter being of a sufficient height to insure the required pressure against the diaphragm 1. The confining-rolls 20, contacting with the cylindrical impression-surface substantially opposite to its tread, may be two in number, as Aindicated in Fig. 1, or asingle one directly opposite, as in Fig. 2, or two above and one at each side, as in Fig. 8.

To prevent perforation and wear on the dia phragm 1 and also to improve the action thereof, I wind the diaphragm withwire 2, which may be rectangular in section, as-in Fig. 4,' or circular, as in Fig. 5. The latter is preferable, as being unable to lean, and

Ithereby present an edge to the printing-surface.

The manner in which the wire 2 improves the'action of the diaphragm is shown in Fig. 6, where the upward-pointing arrows indicate the duid-pressure within the cylinder and the single arrow the printing-'pressure upon the cylinders tread, in this case the form Fbeing supposed to be above instead of below,as in the other figures. As illustrated, the single arrow is resisted by the plurality of arrows instead of by a single arrow on account of the slight flexibility of the wire 2 as compared with the diaphragm 1. Hence the pressure within the diaphragm can be much less intense than would be required were there no such wires. The necessity for the 4said diaphragms being ICO quite iiexible arises from my Wish to have the different wires 2 relatively independent in their yield to the printing-surface, and thus insuring sufficient pressure at every point.

As shown in Figs. 7 and 9, I may form my impression-cylinder from a single coil of comparatively stiff but resilient Wire 3, which is quite narrow compared with its depth, as in Fig. 9. The construction shown in Fig. 8 is somewhat similar, the only difference being that the Wires are not continuous but separate rings 3.

In Fig. 1l is illustrated another modification, in which the impression-surface consists of a resilient drum 3, Which may be slit into partially separate elements, as at 3C; but it is supposed to be supplied with one or more confining-rolls, asin the constructions previously described.

In each of the constructions illustrated it will be noted that the impression-surface is constituted bya continuous hard slightly resilient element so Wound as to present a continuous or smooth surface, while the several forms of cushion therefor comprise the fluidpressure shown in Figs. 1 and 2, a rubber cushion 10, (illustrated in Fig. 3,) and the inherent resilience of the elements themselves in the construction shown in Figs. 7 and 9 and also in the right-hand part of Fig. 11.

In the fluid-pressure constructions and those given in Figs. 7 to 11 it should be observed that each annular portion or section thereof is so formed as to persist elastically in its circular contour, the means for resisting the recession bodily of each of said sections comprising the rolls 2O or other suitable means. Hence the only means whereby the tread of these impression-surfaces upon the printingsurface F can yield to accommodate the inequalities of the latter is by each annular section receiving a slightlyelliptical contour.

In the construction shown in Fig. 12 the bowing of the Huid-pressure support is largely prevented by dividing the same into a plurality of separate sections. Hence when pressure is applied to one section the compressed air or other fluid cannot be forced therefrom to the others, but is mainly confined thereto, and so cannot distort or bow the cylindrical surface as a Whole. These separate sections are formed by the four bags 10b, arranged about the cylindrical support 10 and adapted to be filled with the fluid under pressure through the channel 13, suitable valves being provided for closing the juncture of said channels branches with the bags. The surfaces of these bags are covered by the narrow hard slightly-resilient element 2, Wound about the same, as indicated in Fig. 13, said elements being shown as sinuous laterallyin Fig. 12, but as plain in Fig. 13.

The arrangement of separate fluid-pressure bags set forth in Figs. 12 and 13 is more fully disclosed and claimed in my companion application, designated as Case Gr.

What I claim as my invention,and for which I desire Letters Patent, is as follows, to wit:

1. A cylindrical impression-surface each annular portion of which resiliently persists in its circular contour, in combination with an unyielding surface contacting with the same at points substantially opposite to the tread thereof, whereby the only yield possible to said cylindrical impression-surface is one of distortion from a circular to an elliptical cross-section, substantially as described.

2. A cylindrical impression-surface each annular portion of Which resiliently persists in its circular contour, in combination with one or more unyielding rolls contacting with the same to oppose pressure applied to its tread, substantially as described.

3. In a printing-press, the combination with a cylindrical diaphragm suitably supported, of closely-disposed hard elements covering said diaphragm, and means for applying a {luid-pressure Within the same, substantially as described.

4. In a printing-press, the combination of a cylindrical diaphragm suitably supported, means for applyinga iuid-pressu re within the same, and a confining-roll contacting With said diaphragm substantially opposite to its tread, substantially as described.

5. In aprinting-press, the combination of a cylindrical diaphragm suitably supported, means forapplying a fluid-pressure Within the same, and a continuous, hard, slightly-resilient element so Wound on said diaphragm as to presentacontinuous surface, substantially as described.

6. In a printing-press, the combination of a cylindrical diaphragm suitably supported, means for applying a fluid-pressure within the same, and metallic wires Wound about said diaphragm and forming a continuous surface, substantially as described.

'7. An impression member constituted by a suitable support and a continuous, hard, slightly-resilient, elongated element circular in cross-section and wound to present a continuous surface, substantially as described.

8. An impression member constituted by a cushion-support and round Wire secured upon said support to present a continuous surface, substantially as described.

r 9. An impression member constituted by a cylindrical diaphragm suitably supported and cushioned by Huid-pressure, and round wire closely Wound about the same, substantially as described.

In testimony that I claim the foregoing invention I have hereunto set my hand this 24th day of April, 1900.

MELVIN L. SEVERY.

Witnesses:

LEON M. ABBOTT, A. B. UPI-IAM.

IOC

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