US1746152A - Endless offset sheet - Google Patents

Description

Feb. 4, 1930. J. E GUERRY ET m.

' ENDLESS OFFSET SHEET Filed July 11/1928 2 Sheets-Sheet 1 Ja Mes [/more (Quarry Feb. 4, 1930. v .1. E. GUERR.Y ET AL 5 ENDLES S OFFSET SHEET Filed July 11, 1928 I 2 Sheets-Sheet 2 ATTOR NEY y so mg a portion of a rotaryprintin-g press with Patented Feh.i4,1930 I UNITED STATES PATENT F C JAM S "ELMORE' UE RY, "FRE E ICK wIL IArr-vroRRALt, AND ALBERT JOSEPH.

' muetncn or BIRMINGHAM, ALABAMA .-E1\TDLEss OFFSET S EET 1 "Ci-Application [filed July 11, 1923. s ria u zeteea.

' This-invention relates to improvements in printing presses and hasespecial reference to rotary. pr esses,,.an;.object being to provide an 7 endless ofiset sheet for the second impression roller which maybe repeatedly used, means being provided for guiding a continuous sheet around said roller and for cleaning and drying the sheet after it leaves the roller, so

A that a dry clean'surface will be continuously opresented atthe second impression roller of the press.

- Another objectof the invention is the r0- vision of an oftset'sheet which will be cleaned and fed to thesecond impression roller without rewinding or removing the sheet from the press, the character of the sheet, together with the manner of mounting and operation,

adding materially to the life of the sheet, so

' that the cost ofhandling and'materials will be greatly reduced.

, Another ob ect of the invention is the provision of means for mounting and attaching the sheet and its operating and cleaning mechanism .to a press, so that the invention the press,

the invention further includes the following novel features and detailsof constructiomto be hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings the invention ap'pliedJ Figure 2 1s a sect on onv Figure 1.

the 11 24 of a in like characters ofrefere'nce denote corresponding parts, the'referenc'echaracter indicates .a portion of the frame of the press impression cylinder. By this is meant the cylinder around which the web 12 passes after the first side of the web or paper has been may be supplied as ap'ress accessory, or may p be installed at the time of manufacturev of Figure 1 is a fragmentary elevation show- I Referring tothe drawings in detail wherewhile 11 indicates a portion of the second sion cylinder and the printed side of the web so that this cylinder will be kept free of ink to prevent the printed side of the web from becoming blurred. Ordinarily, this is a special-paper run from-a large roll andafter to thetime-an'd labor required; to 'rewin'd the 1 offset sheet renders it very expensive.- l

"These and'other d1sadvantages are. overcome in'the presentinvention by providing a continuous offset sheet of relativelylong sion cylinder, so that a continuous clean sure face is provided for contactwit-hthe Web'at this point.

In the present instance the invention is shown as attached to arotary press and for this purpose there is provided a frame 13 which is secured tothe frame ofthe press. This frame 13 carries the rollers which drive andgui'de an endless offset sheet 14 which asses around the impression cylinder ll; The sheet 1 1 passes between traction rollers '15..and 16, the latter being adjustable with respect to the formerby' means of an adjustin'g screw 17, and suitable spring means may be, provided to keepthe'roller 15 in proper frictional contactJwith the sheet" 14. The I sheet 14: also passes arounda roller. 18 which:

is} adjustable to regulate the tension of the g-sheet, and for this purpose is'mounted in adjustable bearings19.

22 and 23 which are positively driven'by suitable means from the press',cthe driving. f- I means being such that the peripheral'speeds 1 V of the'r'ollers are at all times in synchronismjg This insures that friction of theofl'set. sheet around the rollers will be'reduced to a mini mum and that the pulluponthesplice ofthe I sheet'at its connected ends will be reduced,

so that the life of the sheet will'be materially increased. The spring adjustment of the I roller 16'insu'res a constant pressure on the sheet irrespective of the thickness ofthelatter.

The sheet; let further passes around a guide c beingrun, must be rewound; The paper 1s costly and deterioratesrapidly and this added H as. .'-'The sheet also passes around rollers 20, 21,

'of adjusting nuts 37.

roller 24 and a tension roller 25. This last mentioned roller is mounted at the outer ends of pivoted arms 26 whose movement in one direction is yieldingly resisted by a spring 2 The sheet 14 passes between the roller 21 and a roller 28. This last mentioned roller operates within a reservoir 29 Which preferably contains oil or other ink solvent. The cylinder 28 is adjustable with respect to the cylinder 21 through the medium of an adjusting screw 29 which regulates the position of adjustable bearings 30 for the cylinder 28. The amount of oilor other solvent applied to the sheet 14 may thus be regulated.

Bearing against the sheet 14 are cleaning and drying elements 31 and 32 respectively. These elements each include frames 33 which are movable upon rods 34. The frames 33 carry flexible wiping elements 35 which bear upon the sheet and which are yieldingly forced into engagement by means of springs 36. These springs may be tensioned by means Located below the sheet and carried by the frame 13 is a drain pan 38.

The sheet 14 is treated with'a special coat-- ing consisting of a mixture of celluloid and acetone, which renders the treated surface impervious to oil, ink and other moisture. However, the sheet possesses such resilience and flexibility that the prepared surface will not crack or break down under the pounding of the type.

WVhen the ink from the first impression upon the web 12 is transferred to the offset sheet 14 at the second impression cylinder 11,- the sheet carries this ink to the rollers 21 sheet after the latter leaves the impression cylinder.

2. In combination with a rotary printing 1 i and 28. At this point the ink iscovered with i oil or other solvent by contact with the cylinder 28 and when the treatedportion of the sheet reaches the cleaning element 31, the ink and oil is removed from the sheet. Then the sheet reaches the drying element 32,,any oil or other moisture remaining upon the sheet is effectually removed, while the drain pan 38 directs this oil back into the reservoir 29. As the sheet travels in the direction indicated by the arrow in Figure 2, a

clean dry surface will be presented to the second impression cylinder.

The invention is susceptible of various changes inv its form,'proportions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of the appended claims.

Having described the invention what is claimed is:

1. In combination with a rotary printing press, an offset sheet having a ductile resilient coating impervious to moisture, means to direct the offset sheet around the impression cylinder of the press between said cylinder and the web, and means to clean the offset

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