US1788424A - Duplicator - Google Patents

Description

J. DURKIN DUPLICATOR Jan. 13, 1931.

Filed May 17, 1950 Patented Jan. 13, 1931 JAMES DURKIN, or rITrsBUneH, PENNSYLVANIA lnuriaentren Appncupn med May 17, 1930. ,serial No. 453,159;

This invention relates to duplicating de vices and more m particular to duplicatorsj having a stationary lgelatinous printingv sur# face. I Y

The primary object of this invention is to provide a duplicator having two stationary gelatinous working surfaces instead of but one such surface, as is now the case with du plicato-rs of this type on the market.

Another object s to provide in a dupli# cator simple means for renewing or exchanging the stationary gelatinous working surfaces with speed and ease.

A further object of this invention is to provide a duplicator having a canvas-backed stationary gelatinous working surface which may be adjusted as to position and tension. Yet another object of this invention is `the provision ofa duplicator which is `simple in construction and operation and which may be manufactured at relatively low cost.

Additional features and advantages of this invention will appear in the following description considered in. connection vwith `the accompanying drawing forming a part of this application, and in which:

Fig. l is a front elevation of my duplicator.

Fig. 2 is a sectional View taken substanV tially on line 2-2 in Fig. l.

Fig. 3 is a perspective view of the deviceA Figs. 4 and 5 are sectional, fragmentary,A

. cn the frame thereof.

Fig. 6 is a side elevation lof the clamping bar of the device.

Fig. 7 is an end View of Fig. 6.

Referring to the drawing, a duplicator built according to my invention comprises a Y Guide rails lor runners Gare securedv inV any desired manner on both' longitudinal sides Y, fl l :or-the base.` These runners are wider thanl the thickness of the basev and extend at both sides thereof to provide clearance space for the gelatinous lilin and vprotect the latter against Contact and friction withxthe top of the table' or desk upon.. which they device isV placed. These lrunners serve also as guides 1for'the sheets upon which printing VVis to be duplicated. To prevent marring thef'surface of the table, etc., upon which the duplieator is used, A't is preferable to cover the top and bottoni sides of the runners with a lin-y ing 7 of felt, or any other suitable and desired material, which lining also keeps the duplicator' from sliding too freely on said table, etc.V Y

` The canvas-backed duplicating film is reclamping-bar comprises a substantially cylin-V drical bar 10 havinga flat portion ll and a corrugated portionl2. At one end of the bar there is secured on the flat portion thereof the handle l-by means of which the clampingbar may be rotated.

The winding roller consists of the cylindrical body portion 14, made of wood or any other suitable and desired material, having a diainetr'al and longitudinal slot l5 into which one end of the duplicating film 5 inserted. Oneend of the body p'ortien is secured by means of a pin 16 in a ferrulel having a centrally disposed Ltrunnion 18. The other end of said body portion is also fastened by a pin connection 19 to another ferrule 20, `to which are secured the ratchet-wheel 21 and the turning shaft 22, the latter provided with a turning handle 23. l

The clampingbar and the-winding roller are rotatably mounted 'in suitably apertured brackets 2li, 25 fastened by means of screws 26, or otherwise, to the outer lateral sides of the. runners 6.4 i

Upon the bracket 25 is rockably mounted a pawl 27 provided with a holdingelug 28 and normally held in yengagement with the Vns to bring its corrugation in engagement with, the gelatinous side of the duplicating film, whereby the latter is securely clamped. The

film is nowloosely Wrapped aboutV both flat able means to stretch said film about said base,

and means Vto hold the film in stretched condition. v v

6. In a duplicator, a base; a fiexible stationary gelatinous duplicating film; means to removably secure said film to expose its effective surface on two sidesof saidbase.;l means to stretch said film on thejbase, and; spacer means adapted to hold said film in spaced relation to the surface on which said duplicatoris positioned.

In testimony whereof I affix my signature.

Y JAMES DURKIN.

faces of the base l and the free end of the'. f7.2 y Y film is then inserted in the slot 15 0f the Windf f ing-roller. By rotating the latter in the proper direction, the film may be stretched taut on the base, and it will be held in this conditionbyv the agency of the ratchet and pawl mechanism fully described above.

To remove the duplicating film, the winding-roller is rotated backwards by first pressing onthe lug 28of the pawl 27 to disengage the latter froml its ratchet-wheel. This releases the tension in the film and, by rotating the clainping-bar out of engagement with the film, the latter may be quickly removed. Y

Vhile I have illustratedherein the present construction of a novel duplicating device having two stationary gelatinous Working surfaces, instead of only one as heretofore available in the trade, itmay befound desirable. after continued experience to make kslight changes in the construction and arrangement of the details of this invention, andI intend to include all such variations in this application, as fall within the scope of the appended claims. Y

I claim: Y l. In a duplicator, a base; a flexible stationary gelatinous duplicating film; means to` removably secure said film to expose its effective surface on two sides of said base. Y

2. In a duplicator, a base; a flexible stationary gelatinous duplicating film; and

means to removably secure said film to expose e its effective surface on two sides of said base;

3. In a duplicator, abase; a fiexible stationary gelatinous duplicating lm; means to removably secure said film to expose its. effective surface on two sidesl of said base,Av

and means to stretch said film on said b-ase.

1l. In a duplicator, a base; a flexible stati onary gelatinous duplicating film; means to removably secure said film to expose-its effectivesurface'on two sides of said base, and ad` f ljust-able means to stretch said film about said base. l Y

5. In a duplicator, a base; a flexible sta.-

tionary gelatinous duplicating film; means to removably secure saidfilm to expose its e'ec.- tive'.A surface on; two' sides of, said. base adjust.-

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