US699420A - Printing-machine. - Google Patents

Description

No. 699,420. 7 Patented May 6, I902.

R. L. SHEPHERD & H. B. BRADFORD, ha.

PRINTING MACHINE.

(Application filed Sept. 26. 1901.) (N 0 M o d e I bBOAIZiOMZ VMD GBOCEBIEZ 'Hllllilllllll UTTED STATES PATENT OFFICE.

ROBERT L. SHEPHERD AND HENRY B. BRADFORD, JR, OF NEW ORLEANS, LOUISIANA.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent NO. 699,420, dated May 6, 1902.

Application filed September 26, 1901. Serial No. 76,673. (No model.)

To all whont it may concern: I Be it known that we, ROBERT L. SHEPHER and HENRY B. BRADFORD, J12, citizens of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana,have

invented certain new and useful Improvements in Printing-Machines; and we do hereby declare the following to be a full, clear,and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in printing devices, and is especially adapted for use in printing on Wrapping-paper as it is drawn from an independent roll.

The main object of our invention is to produce a means for exerting an equal pressure and regulating the said pressure on the rollers, thereby imparting an even impression to the entire surface of the printing-form for securing at all times a perfect print.

Our chief means of attaining this end is by providing an adjustable tension-spring engaging and holding the various rollers in rolling contact and under a predetermined pressure.

To more fully describe our invention, reference is had to the accompanying drawings, in which the same letters of reference designate the same parts in the several views.

Figure 1 represents a side elevation of our improved printing device mounted in front of a roll of wrapping-paper. Fig. 2 is a front elevation of the printing device, a part of the form being broken away to show its rubbercushion support; and Fig. 3 is an enlarged side elevation of the adjustable spring, the

frame and guiding-thimble being shown in section.

To the base A We secure two suitable uprights B, connected at their upper ends by the cross-piece O. The uprights B are slotted for the greater portion of their length, as at 11, and formed thereon are the shoulders I), with the set-screws b. In these vertical slots are j ournaled the shafts of the operating-rollers of the device, the shaft of the platen or impression roller D being supported by the lower edge of the slots. The form or printing roller E, which is also journaled' in the vertical slots 19, is provided at its ends with the annular flanges e, which are adapted to be held in rolling contact against the impression-roller D.

F designates the printing-form and may be secured to the roller E in any suitable manner between the flanges e. The letters are so raised on the form as to be slightly higher than the flanges e, so that when the two rollers D and E arerevolved and the form F passes over the impression-roller the Weight of the impression will fall upon the type, securing a more perfect print.

Although we have describedlhe form F as being affixed to the roller E proper, it may be desirable and in practice we generally do provide a cushion of spongy rubber f, to which the form F is secured. This cushion may also be a pneumatic cushion instead of spongy rubber, as will readily be apparent; or we might use a printing-form comprising a rubber cushion havingraised letters out thereon, as in the ordinary rubber stamps, and suitably secure the same to the form-roller.

The inking-roller G is similar in construction to the form-roller E, the flanges g of the ink-roller being adapted to rest and revolve on the flanges e of the form-roller E.

The inking-roller is provided with a suitable ink-pad G, whichholds the ink and distributes it on the type as they pass beneath the'same during the revolution of the formroller,the inking-roller being of such a diameter in respect to the form-roller that the revolutions of the rollers in respectto each other will be so controlled that the type will engage diiterent parts of the inking-pad in each successive revolution, thereby insuring an even distribution of-ink on the type.

In order to secure a suitable tension device for regulatingthe pressure of the'rollers, we have formed from a straight piece of resilient metal substantially elliptical-shaped springs H, having the inwardly-projecting and concave bearing-surfaces h, which are adapted 9 to engage the shaft of the inking-roller G.

The ends it of these springs are bent outwardly opposite the surface It and are adapted to project into a hollow internally-screwthreadcd thimble or guide-plate I, provided in the cross-piece C of the frame. An adj usting-screw J, having a milled head, is adapted to be screwed into the thimble I, and its end rests against the ends h of the springs H. From this device it will be apparent that the pressure between the rollers will always be uniform, and the vertical freedom of movement of the form-roller can be readily regulated to permit of different thicknesses of paper being passed between the same and the impression-roller, the spring I-I always tending to hold the rollers against each other under tension.

The roll of paper K to be printed on is supported in any suitable manner in proximity to the printing device. We have shown it as supported in suitable uprights L, secured to the base A. We have shown the top crosspiece M provided with downwardly-curved arms N, having a guide 91., which serves to prevent the paper from unwinding too fast. When the paper is fed from a roll, as described, We provide the knife-edge or cutter O, which is supported in front of the printing device by the arms 0, adjustably secured in the shoulders Z) of the uprights 13. Upon the paper being pulled between the rollers D and E the same are caused to revolve, and the type engaging the inking-pad on the roller G will now make an impression on the paper as it passes between the type and the impression-roller, after which the paper is raised into contact with the knife-edge O and torn off in suitable lengths.

Although we have described the paper as being fed from a roll, it is readily apparent that our deviceis equally adapted to print on paper out in sizes, such as bags, blotters, &c.

Having thus described our invention, what we claim, and desire to secure by Letters Patent of the United States, is

1. The combination with a plurality of rollers adj ustably mounted in guideways, of a tension device for regulating the'pressure between said rollers, comprising a pair of substantially elliptical-shaped springs, the lower faces of which are provided with central concave depressions, forming bearing surfaces adapted to engage the shaft of the end roller, and adjustment-screws engaging said springs opposite said central depressions.

2. The combination with a slotted frame and a plurality of rollers adjustably mounted therein, of a tension device for regulating the pressure between said rollers, comprising a pair of substantially elliptical-shaped springs, provided with a central inwardly-projecting bearing-surface, engaging the shaft of the end roller, and outwardly-bent ends opposite said bearing-surface, thimbles mounted in said frame for retaining the ends of said springs, and an adjustment-screw operating in said thimbles and engaging the end of said springs.

In testimony whereof we aflix our signatures in presence of two witnesses.

R. L. SHEPHERD. H. B. BRADFORD, JR.

lVitnesses:

J. F. LEAKE, H. 0. BROWN.

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