US2728294A - Printing table - Google Patents

Description

E. KLIN PRINTING TABLE Dec. 27, 1955 Filed oct. 24, 1952` ,WH y n.7/ M MM w Il .M u 5/ United States Patent O PRINTING TABLE Erich Klin, Netstal, Switzerland, assigner to Stetfel Se Co., St. Gallen, Switzerland Application October 24, 1952, Serial No. 316,763 Claims priority, application Switzerland July 21, 1952 2 Claims. (Cl. 101-4l07) The present invention relates to a printing table, in particular for arrangements adapted to print by means of at stencils, but also, for example, for rotary film printing machines.

So far, quite generally printing tables have been used which comprise a multi-layered textile padding of which the service life was very short.

The printing table as disclosed by the present invention is characterized by a rectangular frame and a resilient stretched metallic tape secured to two opposite sides of said frame and extending over the entire length thereof, which tape serves as printing support.

One form of performance of the present invention is shown, by way of example, in the accompanying drawing in which Fig. 1 shows a cross-section on the line l-I of Fig. 2, and

Fig. 2 a top plan view of the table.

The printing table shown comprises a rectangular frame. Two opposite sides of said frame are constituted by tubes 1, and the other two sides of the frame are constituted by tubes 2. Frontally to the two ends of the tubes 2 are welded plates 3 which on both sides are extended beyond the tubes. In each such extension are provided a smooth bore at the bottom and a threaded bore on top. The smooth bores are traversed by cap screws 4 which are engaged in threaded bores of bracing and connecting members 5. The threaded bores of the plate extensions are traversed by threaded pins 6 of which the plain cylindrical forward portions project into blind holes of said members 5, abutting against the bottom of said holes.

A steel tape 7 of which the width is equal to the length of the tubes 1, with each end engages one of the latter, as is clearly visible in Fig. 1. That side of the members which faces the tube 1, is concave and its cross-section has the shape of a wide-apertured V. The ends of steel tape 7 are clamped between the tubes 1 and the said sides of the members 5 and are prevented from slipping by screws 8 which in the rst place serve the purpose of securing the members 5 to the tubes 1.

The steel tape 7 thus is secured to two opposite sides of the frame which are constituted by the tubes 1, eX- tends over the entire length of said frame sides, is stretched by correspondingly actuating the cap screws 4 and the threaded pins 6, and serves as printing support. The tubes 2 and their plates 3 as well as the screw elements 4, 5 form the other two frame sides of which the effective length is variable by turning the said elements for the purpose of stretching the tape 7 and, thus, of varying the softness of the printing table.

It is readily apparent that the flat and level portion of tape 7 extending between the tubes 1 forms an ideal printing support in that it is capable of resiliently yielding in the direction of printing, i. e. at right angles to its surface or top, but cannot lengthen in any direction.

ICC

In place of the steel tape 7 another resilient metallic band, such as a band of brass, Monel metal or beryllium bronze could be used.

What I claim is:

1. A stationary printing table providing a mono-planar stationary tensioned supporting surface for use in printing by means of flat stencils comprising, in combination, an open rectangular frame, a resilient flexible metallic tape secured at its ends to two opposite sides of said frame and extending across the top open portion of said frame to provide said mono-planar supporting surface for the printing operation, said tape normally engaging said frame only at two opposite sides thereof, the two sides of the frame to which said metallic tape ends are secured comprising tubular members, and clamp members supporting said tubular members, said tape ends passing over said tubular members and being held between said tubular members and said clamp members, the other sides of said frame being of lesser length than the distance between the rst mentioned frame sides, and means for exerting an adjustable longitudinal tension on said tape for maintaining said tape tightly and fixedly stretched across said open portion of the frame, said tensioning means comprising threaded members interconnecting said first named frame sides with said second named frame sides for adjustably varying the spacing between the first named frame sides.

2. A stationary printing table providing a mono-planar stationary tensioned supporting surface for use in printing by means of flat stencils comprising, in combination, an open rectangular frame defined by a first pair of spaced-apart tubular members providing two sides of said frame and a second pair of tubular members of lesser diameter providing the other sides of said frame, and means for interconnecting said two pairs of tubular members, said connecting means including `first plates secured to each end of each tubular member of said second pair, second plates having an arcuate face removably secured to the sides of each tubular member of said first pair, means for connecting said first plates with said second plates, said connecting means providing means for adjusting the distances separating said plates and thereby adjusting the distances separating said first tubular members, and a resilient flexible metallic tape having its ends overlying a portion of the periphery of said first tubular members and being secured between said tubular members and said second plates, said tape being stretched between said first tubular members and normally overlying said plates and said second tubular members but being out of engagement therewith, said'means for adjusting the distances between said plates serving to provide an adjustable longitudinal tension on said tape for maintaining said tape tightly and ixedly stretched between said first tubular members.

References Cited in the file of this patent UNITED STATES PATENTS Re. 9,141 Taylor Apr. 6, 1880 960,218 Droitcour May 31, 1910 1,524,897 Weil Feb. 3, 1925 1,800,343 Geiger Apr. 14, 1931 1,892,268 Flockhart Dec. 27, 1932 1,956,611 Besocke May 1, 1934 2,018,560 Levane Oct. 22, 1935 2,097,832 Brenner Nov. 2, 1937 2,164,363 Waters July 4, 1939 2,409,536 Braunworth Oct. 15, 1946 2,540,862 Buser Feb. 6, 1951

Images