US 1505349 A
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Description (OCR text may contain errors)
Aug. 19,- 1924. 1,505,349
F. N. JQHNSON ET AL SHEET SEPARATING ATTACHMENT Filed April 2, 1-923 gn uenlovf FAA/M 0 Patented Aug. 19, 1924.
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JoHNsoN' assfen'oa. or riis n x grrnn]Riser TO c ean-trier, Homvins, or 'natrins COUNTY, TEXAS.
aflessreeer vs TAQHMENT- Application filed April 2, 1923. SeriatNo. 629,289
1 0 all whom it may concern;
Be it known that we, F-RED;.N.' JQHNSON and VVILLIAM P. Jo nson, citizens ofthe United States ofAmerica, residing atDallas, in the county of Dallas and. State .of Texas, have invented certainnew and'use ful Improvements in Sheet-Separating Attachments, of which thefollowin'g is a specification.
This invention relates to new and useful improvements in sheet separating attachments.
In connection with printing presses it is customary to use automatic devices for feeding the sheets of paper to: the press. In a particular type of press the sheets are stacked horizontally in a vertical pile in a box or other holder. At each operation the top sheet is lifted by suction cups mounted on a carrier which feeds said sheet to the press. It frequently occurs that one or more underlying sheets adhere to the top sheet and are lifted therewith, thus causing one or more sheets to pass through the press unprinted or becoming the means of other trouble. Certain attempts have been made to separate sheets, but such efforts have resulted in built-in complicated devices requiring either a change in the structure of the paper box or feeding means.
The object of this invention is primarilyto provide an attachment which may be se-. cured to the front stock plate or other wall of the sheet holder of a press without altering or substituting any part of the feeder or press. I Y
A further object is to provide an attach ment having a wiping finger having a roughened face which is presented to the edge of the sheet as the same is lifted, whereby said edge is wiped over said face and any adhering sheets thus dislodged from the lifted sheet.
Another object is to provide an attachment having a displaceable finger provided with a roughened face and means for displacing the finger so that it overhangs the stack of sheets, thus providing an adjustment to suit sheets of various weights and thickness.
A construction designed to carry out the invention together with other features will be hereinafter described.
vention is shown. and wherein:
Fig. 1 isanisometric view of a sheet holder.equipped-with attachments made in accordance with the invention,
Fig.. 2 (is a front elevation of one of the attachments,
Fig. 3 is an end elevation of the same, and
Fig. .4 is an enlarged sectional detail show ingthe finger displacingv means.
In the drawings the numeral 10' designates a sheet holder having a. front stock plate 11 and which. is of the usual construction and from which sheets are lifted by suction cup feeder (not shown).
A plurality of attachments each comprising a vertical plate 12 formed of sheet steel or other suitable metal, are provided. Each plate has an upstanding finger 13 slit from its upper central portion. The upper face of the finger is provided with serrations 14; or
otherwise roughened in any suitable manner.
On each side of the linger downwardly bent hooks or clips 16 depend from the top of the plate and overhang the back thereof on eachside of the finger. The lower end of each hook may be rolled to form a bead 15.
In using the attachment a pair are employed and each is mounted on the plate 11.
against the inner side of the stock plate' Thestock of sheets is placed in the holder and againstthe faces of the attachment plates 12. As the serrations 14 are confined to the upper ends of the fingers 13, said serra tions will be above the top sheet. As is shown in Figs. 3 and't the serrations project from the face of the attachment plates 12 and overhang the edges of th'e'sheets. When the top sheet islifted its edge contiguous to the attachments is'wiped upwardly of the fingers 13 and overt-he serrations 14, whereby I any under sheets adhering to the top sheet Will be detached and will fall back into the holder.
WVhen light weight sheets are handled the separation is more difficult and therefore more pressure must be exerted against the edge of the lifted sheets by the fingers to effect a separation. This is accomplished by displacing the fingers 13 inwardly so as to overhang the pile of sheets. To effect this set screws 17 are threaded through apertures 18 in the plate 11 and impinge the rear side of the fingers, whereby each finger is bent outwardly for the attachment plate 12, as is shown in Fig. i. A lock nut 19 on each screw engages the outer face of the plate 11 and fastens the screw and the finger in place. It is obvious that for very thinpaper, such as French folio, onion skin and the like, a greater projection of the fingers is required than where heavier sheets, such as letterheads, inserts and the like are fed. The screws 17 enable minute adjustments and while the attachments may be used without the screws, by bending or wedging the fingers, the screws form a more desirable way.
Various changes may be made as for instance the means of securing the attachments to the stock plate 11 or the roughening of the faces of the fingers, all within the scope of the appended claims. The making and use of a single attachment is also within the province of the invention.
What we claim, is:
1. A sheet separating printing devices comprising a plate, clownturned hooks at the upper end of the plate, a finger slit from the plate between the hooks and having a roughened face, and a set screw for displacing the finger from the plate.
2. A sheet separating attachment for printing presses comprising an upright plate free for insertion downwardly on the stock plate of a sheet holder, downwardly bent hooks on each sideof the top of the plate for engaging over and clipping the back of the stock plate, and an upwardly directed separating finger extending from the plate between the hooks and having a roughened face, said plate being removable upwardly.
In testimony whereof we affix our signatures.
FRED N; JOHNSON. WILLIAM P. JOHNSON attachment for