US391733A - Ed ward s - Google Patents

Description

2 Sheets-Sheet 1.

Patented Oct. 23, 1888.

E. S. BOYNTON. MEANS FR SEGURING PRINTING PLATES T0 BEDS 0R CYLINDBRS 0I' PRINTING MACHINES.

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E. S. BOYNTON. MEANS EOE SEGUEING PRINTING PLATES To EEES 0E GYLINDEES 0E PRINTING MACHINES.

Patented Oct. 23. 1888.

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EDWARD S. BOYNTON, CF NEW YORK, N. Y., ASSIGNOR TO THE CAMPBELL PRINTING PRESS AND MANUFACTURING COMPANY, OF SAME PLACE.

MEANS FOR SECURING PRINTING-PLATES T BEDS 0R CYLINDERS 0F PRINTlNG-IVlACHINES.

SPECIFICATION forming part of Letters Patent No. 391,733, dated October 23, 1888.

Application led January 25, 1888.

To all whom it 'may concern:

Be it known that I, EDWARD S. BoYNToN, of the city of New York, in the county and State of New York, have invented a new and useful Improvement in Means for Securing Printing- Plates to Beds or Cyiinders of Printing-Machines, which invention is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to provide means for readily securing plates of zinc, calcisinterj or similar or Vother thin plates to the beds of reciprocating or to. the printingcylinders of rotary printing machines, by which such plates may be quickly removed or exchanged and always brought under an equalized strain, thus insuring that the plates shall lie close to the bed or cylinder surface without buckling or distortion, or danger ofbeing torn out, or having their edges marred. It is also the object to so secure such plates that they shall entirely cover the beds at the ends where the impressioncylinder enters upon and leaves the plate used, while at the same time excluding the water used in printing from such plates from entering between the plate and the bed to which it is secured, and to also offer a smooth beveled or rounded surface for the impression cylinder to enter upon and leave similar to the rounded edges given to lithographicstonesin power lithographie printing.

The invention will irst be described in detail, and then particularly set forth in the claim.

In the accompanying drawings, Figure l shows a longitudinal vertical section through a dat bed and plate, taken at the line X X of Fig. 2; and Fig. 2 is a View in plan of Fig. l, With a portion of the plate and bed. broken away to show the mechanism of the straininglevers. Figs. 3 and et are similar views of a cylindrical-surfaced bed or turtle.

In said figures the several parts are indicated by numbers, as follows:

The number l in Figs. l and 2 indicates an auxiliary bed-piece, taking the place in a reciprocating lithographie press of the ordinary lithographie stone, and in Figs. 3 and Ll the Same number indicates a cylindrical-surfaced Serial No. 261,855. (No model.)

turtle or plate-holder as used in rotary machines, said bed-piece and plate-holder being each provided with recesses 2,cast in one edge, through which recesses are passed the free ends of a series of levers, 3.A Upon the other edge of the bed l is secured a strip of metal, 4, rabbeted at its lower edge so as to leave or form a narrow slot or space between it and the bed l. The lower edge of the strip 4 is rounded to avoid any sharp-cornered bend in the thin plate 5. Two ofthe other corners of the bed l are also rounded sufciently to allowsaid thin plate to be drawn easily over them,| as at 6 and 7. A rod 8, is secured in the vertical webs of the bed l, and the series of levers 3, above mentioned, are loosely journaled upon said rod. Near the free ends of the levers 3 are set screws 9, impinging upon the under side of the surface web of the bed for the purpose of depressing the free ends of the-levers 3. Said free ends are T-shaped and are secured to a rabbeted strip l0 exactly similar to strip 4 and forming a groove between the l"-heads of levers 3 and the striplO.

In adjusting the printing-plate it is first turned in a U shape at two of its edges, as shown, and then bent into form proper to pass over the rounded edges of the bed 1. It is then slid endwise into the grooves formed by the rabbeted strips 4 and l0, and by the manipulation ofthe set-screws 9 put under even strain until the whole plate lies iat upon the surface of the bed. The grooves formed by the rabbeted strips 4. and l0 need not be nearly a close lit to the thickness of the plate 5, as it is found in practice that if the curves made at the points ll and l2 in the plate 5 be small the grooves may be fully double the thickness of the plate without danger of the plates pulling out; and thus, having a loose lit iu the grooves, the plate may be readily slid on or off the bed, as hereinbefore explained.

Having thus fully described my said improvement as of my invention, I claim- The above-described means for holding thin plates upon the printing beds or cylinders of printing-machines, consisting of a rabbeted plate, as 4, forming a thin groove opening downward at one edge of the bed, andaseries of adjustable levers, as 3, provided with ady placed under equalized strain and capable of justingscrews, as 9, and carrying on their free being quickly removed or exchanged, subro ends a similar vertical groove at the opposite stantia-lly as set forth.

end ofthe bed, in combination with said bed 5 provided with rounded edges, as 6 and 7, EDW ARD S' BOYNTON' whereby said plates are secured by their Witnesses: curved edges in intimate Contact with the FRANCIS P. REILLY, printing bed or Cylinder at all points and JOHN TULLY.

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