US1132046A - Printing-frame. - Google Patents

Description

E. W. SWEIGARD.

PRINTING FRAME.

APPLICATION FILED JANJQ, 1914.

1, 1 32,046 hltented Mar. 16, 1915.

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THE NORRIS PETERS 60., PHo'm-uTl-IQ. WASHINGTON. u. C.

EMANUEL W. SWEIGABD, OF CHICAGO, ILLINOIS.

PRINTING-FRAME.

Specification of Letters Patent.

Patented Mar. 16, 1915.

Application filed January 19, 1914. Serial No. 812,878.

To all whom it may concern:

Be it known that I, EMANUEL W. SWEI- GARD, a citizen of the United States, residing at the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Printing-Frames, of which the following is a specification.

This invention relates to improvements in printing-frames of the type which is adaptable for use in lithographic or offset printing as well as half-tone and line printing, and it consists in certain peculiarities of the construction, novel arrangement and operation of the various parts thereof as will be hereinafter more fully set forth and specifically claimed.

The principal object of the present invention is to provide a printing frame of the above named general character, which shall be simple and inexpensive in construction, strong and durable, and so made, as to be eflicient and scientifically accurate in operation and construction.

A further object of the invention is to so construct and arrange the parts of the frame that very great and uniform pressure of the pressure-board will be attained without the tendency of drawing or tipping the sides of the frame inwardly, which heretofore has frequently been the case in old styles of printing frames, and at the same time, to reduce to a minimum the strain to which the frame proper is subjected.

Still another object is to provide simple and eflicient means for the adjustment of the pressure-bars, to the end, that they may be readily adjusted with the greatest degree of nicety or accuracy which is an absolute necessity in lithographic work.

A still further and important object of the invention is to afford an improved pressure or copy board, which will avoid or overcome the objectionable points of the old style boards, such as the tendency to sag or warp, and the uneven pressure thereof, by so constructing the board that the pressure will not only be applied thereto at the mathematically correct places, but will be uniformly distributed all over the board.

Various other objects and advantages of the invention will be disclosed in the subjoined description and explanation.

In the accompanying drawingsFigure 1 is a view partly in elevation and partly in section of the front portion of a frame embodying the invention, showing a part of one of the pressure bars raised; Fig. 2 is a view partly in section and partly in elevation taken on line 2-2 of Fig. 1, looking in the direction indicated by the arrows, but showing the pivot pin for one of the pressure bars omitted to illustrate the openings for said pin; Fig. 3 is a fragmental view of a portion of the frame, a part of the pressure guard, and a portion of one of the pressure arms illustrating a modification in the construction of the frame; Fig. 4 is a detailed view in elevation of one of the clamping loops or links, showing it and its guard mounted on a screw bolt, and Fig. 5 is a sectional view taken on line 5-5 of Fig. 4, looking in the direction indicated by the arrows.

Like numerals of reference denote like parts throughout the different views of the drawings.

The reference numeral 10 designates a rectangular frame, which may be of any suitable size and material, but preferably of wood, the pieces of which are connected together at the corners by means of angle brackets 11, or metal corner pieces. At its lower portion the frame 10 is provided with an inwardly extended flange or portion 12, to support a glass plate 13, on which the negative 14, from which the print is to be taken, is located with its film side uppermost, and upon this negative 14 is located a plate 15, which may be either a sheet of sensitized paper, or, a zinc plate, or any other 7 of the well known articles adapted to receive a print through a negative. As shown the inwardly extended portion or flange 12 is frame-like and thus allows light to pass through the glass 13, and negative 14, to enable the print to be transferred onto the plate 15 in the usual or well-known way.

At each of its sides the frame 10, is provided with a horizontally extended rib 16, which will rest on the table or support for the frame so as to hold the lower portion thereof at a distance from the table or support.

Extended vertically through suitable openings in the rear portion of the frame are a number of screw bolts 17, which are suitably spaced apart, and each of which has on its lower portion an adjustin nut 18 to engage the lower portion of the frame 10, and on its upper portion an adjusting nut 19, to engage the upper part of said frame, thus permitting each of said bolts to be adjusted vertically with great nicety and accuracy.

Fitted on the upper end of each of the bolts 17 is a rectangular-head 20, which'is embraced by the upwardly extended arms 21, of a head 22, which surrounds the bolts 17 just below the head 20 thereon, and which may be held in place by means of a nut 23, engaging the bolts '17 below said head. The upper portions of the arms 21 of the head are provided with openings 24, through which is extended a split key or pivot 25, which is also extended through a suitable opening in the head 20 which forms the free end of abracket 26, one of which brackets is secured to each of'the pressure bars 27, at its rear end. 'These pressure bars may be made of any suitable size and material, but preferably of wood, and of suflicient length to extend from the front portions of the heads 22, to about the inner front portion of the frame 10, as is clearly shown in Fig. '2 of the drawing. I

Extended vertically through the front portion of the frame 10 area series of screw bolts 28, which correspond in number to the screw bolts 17, and-arelocated at the front end of the frame in parallel lines with the last named screw bolts. Each of the screw bolts 28 is provided a t'its lower end with an adjusting nut 29, to engage the lower portion of the frame 10, and above said frame with an adjustin'g-nut30,to engage the upper surface of the frame, thus enabling said 'bolts tobeadjusted with great accuracy.

Mounted o'n'the upperend ofeach of the bolts'28 is aguard31, which has upwardly extending prongs 82, which are adapted to stridethe outwardly .or forwardly extended portion of a bracket "33, which is horizontally securedtothefront portion of eachof the bars 27. The outer or free end of each of thebrac'kets 33 is provided with forks 3 f, between which is secured a cam lever 35, whichhas on its inner end ahook 36, and at its other .end a handle 37. The lowerportion of each .of the guards '31, isprovided with downwardly extended hooked bearings 38, which overlie and engage bearing portions 39fformed on thelowerportion o'fa loop 40, one of which is mounted on each of the screwbolts 28, and'hasitslupper portion extended transversely of the prongs 82, of'the guard, aslisc'learly shown in Figs. 1 and 4 of the drawing. Each of the loops 4O isprovided at its lower portion with an extension 41,1ocated'between the bearings 39 of said loop .to rest against the bolt 28 on which it is mounted, in order to restrictits outward movement. 7

Locatedin the frame 10, for vertical movement is the pressure or copy board 42, which may have on its lower surface cushioning material 43, of any desired kind, to rest against the plate 15 on which the image of the negative is to be transferred.

Extended across the board as from its front to its rear portion, and suitably sezcured thereto, are a number of standards 44,

which correspond in number to the pressure arms "27, and are located directly beneath said arms so as to receive pressure therefrom. On the upper surfaceof each of thestandards 44: are secured a number of elastic cushions 45, which are preferably cylindrical in shape and of rubber. Instead of-securingthe cushions 45, to the "standards 44, as shown in Figs. 1 and 2 of the drawing, and above described, I may secure said cushions to the lower surfaceof each of the pressure bars 27, as shown in Fig. 3, when it is apparent that by loweringsaidbars' the cushions i5 will be interposed between the bars and standards so as to afford resiliency or a cushioning effect very similar to that afforded when the cushions 45 are secured to the standards.

From the foregoing and by reference to the drawing, it will be readily understood and clearly seen, that in order to produce a print, the negative 14 may beplaced with its film surface upwardly on'the glass1'3, after which the plate 15 may be placed on the ne ative, which will be held in contacttherevith by means of the pressure board'42 and its cushioning material 43, when the'la'tter is employed. In order to permit of the free insertion and removal of the pressure board 42, it is obvious that the pressure bars '27 may be ralsed to thepos1tions shown at the right hand of Figs. 1 and '2, and it is apparent that when it is desired'to applypressure toithe plate -15,'the bars 27 can'be turned downwardly, in which operation the books '35, can'be caused to engage the loops or links 40, when by turning'the cam levers 35 from the position shown in Fig. 3 to that illustrated in Fig.2, it is manifest that great pressure will be applied to the board 42 through the instrumentality of the bolts 17 and 28, the links 40, levers 35, :bars "27,

cushions l5 and'standards 4 6i, which'are'located at the proper places to aline with'the bars '27, and to uniformly distribute "the pressure toitheipressure board. As the bolts 17 and .28 are extended vertically "through the rear and front portions of the frame 10, it is evident that the pull on the "bolts will be closer tothe points of resistancethan in the old styles of printing frames, and that the tendency of drawing or -tipping 'the frame sides inwardly will be obviated or lessened. "By securing the pressure-bars 27 tothe arms'21 ofthe heads 22, by means of the split keys 25, it is evident'that :byremoving saidkeysthe-saidbars may be readily detached and removed fromthe frameso as to be entirely out of the way of the manipulation of the pressure board or stone when such is employed.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination with a frame, of a pressure-board located therein for vertical movement and having on its upper surface a horizontally extended standard, a vertically adjustable bolt located on the frame at each end of said standard and in alinement therewith, a pressure bar pivotally secured at one of its ends to one of said bolts and adapted to lie directly over said standard, means on the other of said bolts and at the free end of said bar to draw the latter toward the frame and to lock it in place, and cushions interposed between said bar and standard.

2. The combination with a frame, of a pressure-board located therein for vertical movement and having on its upper surface a horizontally extended standard, a vertically adjustable bolt located on the frame at each end of said standard and in alinement therewith, a pressure bar pivotally secured at one of its ends to one of said bolts and adapted to lie direct-1y over said standard, means on the other of said bolts and at the free end of said bar to draw the latter toward the frame and to lock it in place, and cushions mounted on the upper surface of said standard.

3. The combination with a frame, of a pressure-board located therein for vertical movement and having on its upper surface a plurality of standards extended in parallelism across the board, a vertically adjustable bolt located on the frame at each end of each of said standards and in alinement therewith, a pressure bar pivotally secured at one of its ends to each of said bolts at one end of the frame and adapted to lie over said standards, means on each of the other of said bolts and at the free end of each of said bars to draw the latter toward the frame and to lock them in place, and cushions interposed between said bars and standards.

4. In a printing-frame, the combination with a vertically adjustable bolt, of a guard mounted on the upper end thereof and having upwardly extended prongs and a downwardly extended bearing-projection on each side of the bolt, and a link having at its lower part bearings engaged by the said bearing-projections and between the same an extension adapted to contact with the bolt and restrict the outward movement of the link, said link having its upper portion extended transversely of the upper portion of the guard prongs.

EMANUEL W. SWEIGARD.

Witnesses:

CHAs. O. TILLMAN, A. S. PHILLIPS.

copiel of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0.

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