US 638326 A
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Description (OCR text may contain errors)
No. 638,326. Patented nec. 5, |899.
l E. L. FARB.
PRINTINGMACHINE FOR OIL CLOTH, LINLEUM, SLC. (Application filed Apr. B, 1899 lNo Model.)
EDWARD L. FARR, OF WENONAH, NEW JERSEY.
PRINTING-MACHINE FOR OIL-CLOTH, LINOLEUIVI, 850.
SPECIFICATION forming part ef Lettere Patent No. 638,326, dated Deeemleeii 5, ieee.
Application filed April s, 1899. serial No. 712,225. (No model.)
To ttZZ ivi/tom it may concern: I
Beit known that I, EDWARD L. FARB, of Wenonah, Gloucester county, New Jersey, have invented an Improvement in Printing* Machines for Oil-Cloth, Linoleum, and Similar Fabrics, of which the following is a specification.
My invention has reference to printing-machines for oil-cloth, linoleum, dro. and it consists of certain improvements which are fully set forth in the following specification and shown in the accompanying drawings, which form a part thereof.
The object of'my invention is to provide a suitable construction for holding the printing-block to the forln-bed, so that it shall be iirmly held in place and yet readily removed without the least injury to the means of attachment. My construction is so formed that the printing-block may be repeatedly attached to and removed fromthe bed, such as would be necessary in duplicating the production of any given design, without in any manner in j uring or destroying the said connection, which is relied upon for properly locating or registering the printing-block upon the bed.
In oil-cloth-printing machines, as is Well known, there are a series of beds arranged side by side in the length of the fabric tobe printed, and with each of saidbeds operates a printing block or blocks for imparting to the surface of the fabric a definite design in color, but so disposed that the various colors impressed upon the surface of the fabric shall properly and accurately register to avoid blurring. Itis therefore most important that the means of attaching the printing-blocks to the beds shall be accurate and permit the rapid attachment of said blocks without danger of improperly adjusting them upon the bed. By so constructing themeans of attachment that such improper adjustment is avoided liner results are secured and considerable saving in labor is accomplished. Heretofore it has been customary to attach the printing-blocks to the bed by large lag-screws, which extend down through holes in the bed and enter the wood backing of the printing-block. It is evident that this lnethod has a tendency to tear out the wood, so that repeated attachments or continued use destroys the hold of the screw-threads upon the wood and ulti mately the block becomes defectively supported in place. It is furthermore evident that as the lag-screws are small in diameter the great strain put upon the wood in securing said screws in place naturally so dgstroys the Wood that the hold of the screw is greatly weakened. This prevents frequent use of the same blocks or repeating the use of the blocks without first plugging up the holes and then carefully reboring them. To obviate these defects, I employ a lnetallic bushing of large diameter, which is permanently screwed down into suitable apertures made in the back of the printing-block, the said bushings being of relatively large diameter to the clampingscrews and presenting a great resistance against being torn out of the wood. The printing-block is furnished with a number of these metallic bushings properly spaced over its back surface, and screws of small diameter are passed through the form-beds and into central screw-threaded apertures in said bushings, the diameter of said screws and the size of the threads being greatly less than the threads of the bushings which enter the wood. In this manner the greatest possible clamping strain may be exerted in attaching the printing-block to the bed without in any wise endangering thewood or injuring the means of connection. Under these conditions the same block could be used a hundred times,if necessary, without in any Wise causing injury to the means of attachment, and consequently its replacement in the press in every instance would be absolutely accurate and a reproduction of the printing might be accomplished without fear of defective register.
My improvements also comprehend certain details of construction, all of which will beV better understood by reference to the accompanying drawings, in which- Figure l is a sectional elevation across the form-bed, printing-block, and platen. Fig. 2 isa plan View of a portion of the type -form and printing-block. Fig. 3 is an enlarged sectional elevation showing my improved bushings and clamping-screw in position in the block. Fig. 4t is a plan view of the bushing. Fig. 5 is a side elevation of the bushing removed, and Figs. 6 and 7 are plan views of the bushings slightly modiiied.
A is the form-bed, which may be made in IOO s ceases one at each end and one in the middle. To the bottoms of these I-beams there is arranged a series of parallel base-pieces E, which are adjustably clamped upon the lower flanges of the I-beams, so that they may be adjusted in the direction of the length of said beams. The base-pieces .E are held to the I-beams by ihe clamping-jaws e c and clamping-screws F. 'Ihe bottoms of said base-pieces are level and are perforated for the passage of the clamping-screws I for the printing-blocks. G is one of the printing-blocks,which is approximately about eighteen inches in width and about forty-live inches in length, though this size may be greatly varied, if desired. The block is made up of a series of layers of wood, as clearly shown in Fig. l, and is provided on its lower or printing face with the engraved or otherwise-formed printing-surfaces J. rlhe back is carefully marked off by the employment of suitable templets to insure the location of the holes in which the bushings are to be placed, and said portions of the back are then carefully bored by a suitable machine. The holes which are so formed in the wood-packing of `the printing-block have a diameter equal to the diameter of the bushings at the roots of the threads, so that the central portion or body of the bushing snugly fits the hole.
'Ilhe bushings consist of the central body portion H, -having large screw threads h around the outer surface and which are preferably formed as shown in Fig. S-namely, so that the upper surfaces are radial and approximately horizontal and the lower surfaces inclined-the construction being such as to offer a greater resistance against upward displacement under the clamping action. It furthermore has a less tendency to rupture or split the wood into which the said bushings are screwed. The outer and lower ends of the bushings are respectively bored out, as at M and N, to a larger diameter than the clamping-screws l, and the intervening portion of the body is bored out at O and adapted to receive the screw-threaded portion of the clamping-screw I. The clamping-screws I pass through holes in the base-pieces E, and are readily centered into the screwthreaded holes .D of the bushings owing to the recessed upper part M. These bushings have their upper edges notched or slotted, as at L, into which a suitable screw-driver may be placed for screwing them into place.
In place of having the slotted portion L the bushing may have a square hole M, as shown in Fig. 6, or a square head, as shown in Fig. 7, whereby a suitable wrench may be applied for screwing them into the wooden block.
Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-
l. The combination of the type-form bed of a printing-machine having a series of small round holes distributed over its surface, with a printing-block having at intervals in its back metallic bushings screwed into the wood of the block and provided with screw-threaded apertures of small diameter terminating in the top or outer ends in enlarged recesses, and clamping-screws snugly fitting the holes in the form-bed and screwed into the bushings and adapted to be guided therein by the enlarged recesses in the ends thereof.
2. In a printing-press the combination of a type-form bed of metal having a series of round holes distributed over its surface, with a printing-block consisting of a fiat block of wood of relatively great area with reference to its thickness and having its back formed with a series of apertures distributed over and at right angles to the surface of the back in which are metallic bushings each bushing having coarse screw-threads screwed Wholly within said apertures and a central screwt-hreaded hole of small diameter and less vertical height than the bushing, and clampingscrews of small diameter adapted to said l bushings and'passing through and closely fitting the round holes in the form-bed whereby to secure the block to the type-form bed of a printing press without possible misadjustment. I
3. A bushing for a printing-bloclcconsisting of a cylindrical body of uniform external diameter and with a substantially dat top and bottom, the outer surfaces of the body portion being provided with coarse screw-threads of same diameter throughout and the central portion of the body being perforated by a small screw-threaded aperture extending entirely through the bushing in the direction of its length, being of less length than the full height of the bushing and terminating in the outer end or top in an enlarged recess adapted to act as a guide to the entering screws.
4. A bushing for a printing-block consisting of a cylindrical body portion having coarse screw-threads about its outer circumference and having the central portion of its body reduced in vertical thickness and said reduced portion formed with a central screw-threaded aperture of small diameter.
5. A bushing for a printing-block consisting of the body I-I having the outer screwthreads'h of coarse pitch and the top and bottom ends of the body recessed as at M N and the metal intermediate of said recesses formed with a screw-threaded aperture O of smaller diameter than the diameters of said recesses parallel to the outer threaded portion and eX- tending entirely through the bushing.
6. A bushing for a printing-block consisting of the body H having the outer screwthreads h of coarse pitch and formed With radial upper edges and inclined lower edges, and the top and bottom ends of the body recessed as at M Nand the metal intermediate of said recesses formed with a screw-threaded IOO ' with a screw-threaded aperture O of smaller diameter than the diameters of said recesses and notches L formed in the walls of the body opening into the recess M.
S. A printing-block for a printing-press comprising a Wooden block of extended area and composed of a series of layers of wood united together and having an impressionsurface formed or attached to the lower part zo of the block, and a series of metallic bushings distributed over the upper opposite surface of the wooden block, said bushings each having external screw-,threads and screwed into the body of the wood so as to attach themselves to 2 5 a series of the upper layers of the block and also havinga central aperture screw-threaded and of small diameter and the upper and outer surfaces of the said bushings confined below a plane lying in the upper surface of 3o the block.
In testimony of which invention I have hereunto set my hand.
EDWD. L. FARB.
MABEL R. FARE, WM. C. CATTELL.