US368757A - Fastening for printing plates upon otlindeical surfaces - Google Patents

Description

(No Model.) f 4 sheets-sheen 1. J. A'. DEAR.

PASTENING FOR PRINTING PLATES UPON GYLINDRIGAL SURFAGBS.

Patented Aug. 23, 1887.

(No Model.) 4 sheets-sheet 2. l yJ. A. DEAR.

PASTENING POR PRINTING PLATES UPON GYLINDRIGAL SURFACES.

(No Model.) 4 sheets-sheet 3. J. A; DEAR. PASTENING POR PRINTING PLATES UPON CYLINDRICAL SURPACES.

Patented Aug. 23, 1887.

N. PETERS. Phmn-Lnhugmphnr. Washington. D. t;

(No Model.) 4 Sheets-Sheet 4. A

J. A. DEAR. l

PASPNING POR PRINTING PLATES UPON GYLINDRIOAL SURPAGES.

Patented Aug. 23, 1887.

l gnpher. washington, D. C.

lUNrTnD STATES PATENT JOSEPH A DEAE, OF JERSEY CITY, NEW JERSEY.

FASTENING FOR PRINTING-PLATES UPON CYLINDRICAL SURFACES.

SPECIFICATION forming part of Letters Patent No. 368,757, dated August 23, 1887.

Application filed November 2.3, 1886. Serial No. 219,551.

To @ZZ whom it may concern:

Beit known that I, Josnrn A. DEAR, of Jersey City, in the county of Hudson and State of New Jersey, have invented an Improvement in Fastenings forv Printing-Plates Upon Cylindrical Surfaces, of which the following is a specification.

The object of this invention is to secure stereotype, electrotype, or other printingplates uponthe type-cylinders in printingpresses so that they can be easily placed, adjusted, or changed.

In the drawings, Figure I is a section of a portion of the printing-cylinder. Fig. 2 is a plan of the convex surface and the parts thereon as if laid out fiat. Fig. 3 is a section at the line :c x, Fig. 2. Fig. 4t is a section, in larger size,of a chase-frame with my improvements applied thereto. Fig. 5 is a section at right angles to Fig. 4. Fig.6 is aplan view of the chase-frame detached5and Fig. 7 shows the chase-frame, plates, bands, and fastening devices as if laid out iiat.

The stereotype or other plates A are cut to the proper size with the corners rectangular, and the middle portion of each side is cut back slightly, so that the plates will only bear one against the other edgewise at the corners, which causes the plates to set together without any risk of rocking one against the other. Each plate has a margin, the printing portion of the plate standing above the margin sufficiently for the introduction of the clampingbands B, which are preferably of steel and are l drawn sufficiently tight to bind the printingplates firmly down to place upon the cylinder A. In order to draw thesc bands tight, and also to allow for loosening the same and removing and changing the printing-plates, I provide the blocks D and E `for the respective ends of each band.

One end of each band is attached firmly to one block, D, preferably by a screw, 2, and to obtain the necessary strength at the point of attachment the band may be thickened or widened. The other end of the band is made as a hook or catch to pass into andconnect with the nut-block 3, that is within a slot in the block E, and this slot is widest at the bottorn, and the nut-block iits the same, so that when the block E is in place in the printingcylinder A the nut-block cannot fall out, and

(No model there is a set-screw, 4, passing through the nut-block and within the slot in E, so that the Vband can be tightened up by turning the screw after the end of the band has been hooked upon the nut-block.

My improvement is available with a printing-cylinder or with chase-frame or a segment or turtle for the cylinder. The blocks D and E are received into grooves that run parallel to the axis of the cylinder, either in the cylinder or in the chase-frame or in the turtle, andthe ends of the blocks D E should be tapering or dovetailed, so as to be held in such grooves and be adjustable longitudinally of the cylinder to bring the bands to the proper places for holding the printing-plates.

In many instances it is advantageous to lock up the plates in their proper relation to each other in a removable segmental chase, so that one chase may be lifted oit' the cylinder and another substituted without disturbing the adjustment of the respective plates. \Vith this object in view I provide in the cylinder A',

. or cylindrical segment, peripheral grooves at suitable distances apart for receiving the arc bars I, that are connected at their ends to the chase bars K, so as to form a frame or chase, the cylinder A being channeled longitudinally to receive such bars K, and within grooves in the bars K the respective blocks D E are received. The bands B may coincide in position to the are bars I, so as to clamp the margins of the plates to such arc bars, or the bands may be placed intermediate to the arc bars; but usually there will be but few of these arc bars-say three in each frame or chase; and to support the intermediate plates, A, I make use ofthe parallel bars L, that cross the arc bars and are beneath the edges of the plates A, such plates being undercut or dressedl off upon their under edges, so as to rest upon these parallel bars and be supported by them. These parallel bars are supported upon the arc bars, and the bands confine both the plates and the parallel bars to the arc bars.

The bar L', adjacent to the blocks D, may be fastened to the cylinder, as shown in Figs. 1 and 2, or it may be fastened to the chaseframe, as in Figs. 4 and 7. In either instance the plates A abut against or lap upon such bar L.

In order to be able to press the plates toward each other peripherally, I make use of the edge bars, M, at the opposite edge of the form to the bar L', and this bar is parallel to the bars L, and it is between the edges of the plates A and the blocks E, and there are the wedge-shaped side-sticks P P', that serve to lock up the printing-plates by pressing upon the edges of thc same in a peripheral direction. These side-sticks may be upon the surface of the cylinder, as in Figs. l and 2, or upon the chase-frame, as in Figs; et and 7. 'In all instances thev bands B pass across these sidesticks. If desired, the side-sticks may be made thicker at the wedge portions and be received into grooves either in the cylinder or in the chase-frame.

The chase-frame may be attached to the cylinder when in place by screws, as at 6.

lThe chase-frame may occupy any desired portion of the printing cylinder and be adapted to receive any number of pages or printing-plates.

The screws P2, for setting up the side sticks, may be applied within a groove or recess in the cylinder or in the chaseframe.

The devices for confining the ends of the plates at the edges of the form may be bands that are thickened and undercut, as seen at b2, Fig. 5, or strips of card-board or similar materials may be laid 'at the ends of the plates and conned by the bands, so as to give an even bearing for the bands, and there may be followers or screws upon the surface of the cylinder near its ends, as usual, to press the edges of the form toward each other.

I claim as my invention- 1. The combination, with the form-cylinder and the printing-plates, of the bands B, passing over the margins of the printing-plates and partially around the cylinder, the blocks D, to which the bands are connected at one end, the nut-blocks, the screws, and the dovetail blocks E, to which the other ends of the bands B are detachably connected, substantially as set forth.

2. The combination, with the grooved formcylinder, of a chase formed of arc bars and longitudinal bars, the bands for confining the printing-plates and the blocks, and tightening mechanism for applying tension to the bands, substantially as set forth.

3. The combination, with the grooved formcylinder and the printing-plates, of parallel bars to receive upon them the edges of the printingplates, the bands crossing the parallel bars and resting upon the margins of the printing-plates, and mechanism, substantially as specified, for applying tension to the bands, as set forth.

4. The combination, with the grooved formcylinder and printing-plates, of bands passing over the margins of the plates, dovetail blocks in similar grooves, to which the bands at one end are connected, and nut-blocks to which the bands at the other ends are removably hooked, dovetailed blocks with dovetailed openings therein receiving the nut-blocks, and screws within the openings and passing through the nut-blocks, substantially asset forth.

5. The combination, with the form-cylinder and the printing-plates, of bands resting upon the margins of the printing-plates, and means for tightening such bands, parallel bars for supporting the plates, and edge bar and sidesticks, substantially as set forth.

6. The combination, with a grooved formcylinder, of a removable chase having arc bars and grooved bars connecting the ends of the arc bars, bands connected at their ends to blocks within the grooved bars, and screws for tightening the bands, substantially as set forth.

Signed by me this 18th day of November, A. D. 1886.

JOSEPH A. DEAR.

Witnesses:

Gno. T. PINCKNEY, WILLIAM G. Mor'r.

Images