US2303171A - Moistening device - Google Patents

Description

MoIsTENING DEvicE` Filed Jan. 1511940 www l g 1. g .07" ,1.5.55

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Patented Nov. 24, 1942 naar stares ..ear-genrf carica Y 2,303,171 y l Mors'rnNiNG nevica 'l Robert F. Morrison, Oak Park, Ill., assignorto Ditto, neorporated,-Chicago, Ill., a, corporation. cfgWest Virginia y l l applicaties January 15, rsiassriaiNo. slaan'.

claims (o1. era-51) f This invention relates to moistening devices designed particularly for use in connection with liquid process duplicating machines, in which copy sheets are forwarded. into impression relationship with a master sheet carried ,aroundby a drum, and 'in which the means for forwarding the copy sheets to the drum comprises a pair of rollers, to one of which-va supply of solvent is fed for application to the face of the copy sheet on its way to the drum. It is the object of this In the construction illustrated, improved means is shown for applying a film of moisture to the lower one of the cooperating forwarding rollers, this arrangement comprising a receptacle -for holding a supply of solvent in contact with the machine rotatably mounted in position on a horizontal axis on a framework 28 and arranged for holding a ,master sheet 22 removably in position on the drum. An impression roller 25 is rotatably mounted in pressure relationship with the drum 55 of thecylindrical surface of the roller for scrapso as tocooperate with the. drum for` carrying a copy sheet forwardly in engagement with Ithe outer face of the master sheet 22.

Means isprovided for forwarding copy sheets `one at aftime to the drum and the impression roller, suchnmeanscomprising two forwarding rollers 84V and 85 mountedl in cooperative relationship to each other at a short distance to the rear of the impression roller 26.' The rollers 84 and ceptacle 85 adapted :to hold a supply of solvent below and about the roller, such roller 85 being `supported byarms or levers 81 of angular formation as is shown in Fig. l and pivotally mounted by means of machine screws 88, coiled springs 89 being provided for pressing the roller 85 upwardmoistening roller without the intervention of anyrZO ly into pressure relationship with the roller 84 spreader or other intermediate roller. In this which is mounted on aj fixed axis on the frameconstruction, an improved arrangement ofwiper work. .ff .means isv provided, comprising'wipers of sponge f Inthe y.arrangement shown, the roller 88 is rubber or other suitable absorbent material enprovided with a facing of sponge rubber or the gaging both side faces of vthe moistening roller, T25 like, the lower roller 85 being provided with a v together with suitable means for pressing such comparatively hard facing portion made of comwiper members into operative relation to the paratively hard rubber or neoprene or other simmoistening roller. An improved arrangement of ilar material. Means (not shown) is provided for wiper means for the ends of the moistening roller supplying solvent to the receptacle 86, such means is also provided, comprising scraper means of rub- 3Q 'being of any suitable type well understood in 'ber bearing directly on the ends of the roller and connection with this type of machine. The reon the end portions of the cylindrical face of -ceptacle 85 is also preferably provided with'overthe roller, flow means of any suitable type for limiting the It is another object of this invention to improve depth of the solvent therein; l moistening devices in sundry details hereinafter 35 At opposite sides ofthe roller 85, wipers 98 pointed out. The preferred means by which the and Sl areA provided, formed 0f Spenge rubber or several objects have been attained are shown in the like, with the surface skin removed so asv the accompanying drawing, in'whichto make the wipers readily absorbent for removv Fig. 1 is a vertical sectional View through the ing surplus moisture from the roller 85 as the preferred form of my improved machine; 4o roller revolves. In the arrangement shown, the Fig. 2 is a horizontal sectional view taken subwiper 98 is mounted in a shoe 92, which is pressed stantially at the line 2-2 of Fig. 1; by a set screw 93 toward the roller 85 for ad- Fig. 3 is a vertical sectional view taken sub- J'llSng the pressure Of the Wiper on the roller. stantially at the line 3-8 of Fig. 1; and The wiper 9|, on the other hand, is mounted Fig. 4 is a horizontal sectional view taken sub i5 in a shoe 94 which is -pressed by a coiled spring stantially at the line 4 4 of Fig. 3. 95 toward the roller for Iassuring that such wiper Referring now to the several Vfigures of the '9| shall have effective engagement With Said drawing, in which corresponding parts are indiroller- BelOW the Shoes '92 and 94, Pins 96 have -cated by the same reference characters, I9 inhave been provided for supporting the wipers in ydic-aies the drum of a liquid process duplicating 5o their Operative positions- At opposite ends of the roller 85, at points between the wipers 90 and the roller S4, Scrapers 91 have been provided having notches at 98 (see Fig. 12) soas to engage both f the end faces of the roller and the end portions ing surplus solvent from the roller. VIn the arrangement shown, the scrapers 91 are mounted in holders 99 in the form of channels, such channels being pressed toward'the ends of the roller by means of set screws which are adjustable for 'varying the pressure of the Scrapers against the roller.

As the roller 85 rotates, it picks up a supply of sol ent from the receptacle 86 for application to thbottom face of the copy sheet going forward to he drum, the wipers 90 and 9| being adapted to (limit the amount of liquid supplied to the copy sh'eet, and the wipers 91 being effective for removing the surplus liquid from the ends of the roller 85. Y

In the arrangement shown, a table IUI of any suitable type is provided to the rear of the forwarding rollers 84 and 85 for supporting a pile of copy sheets in convenient position for being fed to the forwarding rollers. A cover plate |02 is also provided above the roller 84 for preventing splashing of the solvent upon the master sheet carried bythe drum.

While I prefer to employ the form of construction as shown by the drawing and as above described, my invention is not to be limited to such arrangement except so far as the claims may be so limited, it being understood that changes might well be made in the construction and arrangement without departing from the spirit of the invention.

I claim:

1. In a moistening mechanism for applying lav film of liquid to a sheet and forwarding such ing the application of an excessive amount of the liquid to said sheet, adjustable means for pressing said wiper member with a controlled degree vtion of said roller for enabling the roller to pick up a supply of liquid for application to the bottom face of the sheet, wiper means engaging the upwardly moving face portion of said roller for preventing the application of an excessive amount of liquid to said sheet, and wiper members for the end portions of said roller and notched so as to engage both the end faces and the cylindrical surface of the roller at the upwardly moving face portion thereof for lremoving surplus liquid therefrom.

3. In a moistening mechanism for applying a lm of liquid to a sheet, the combination of a roller, means cooperating with said roller for forwarding a sheet in contact with the upper face of the roller, a receptacle adapted to hold a quantity of liquid in contact with the lower portion of said roller for enabling the roller to pick up a supply of liquid for application to the bottom face of the sheet, wiper means engaging the upwardly moving face portion of said roller for preventing the application of an excessive amount of liquid to said sheet, wiper members for the end portions of said roller and notched so as to engage both the end faces and the cylindrical surface of the roller at the upwardly moving face portion thereof for removing surplus liquid therefrom, and adjustable means for pressing said wiper members into engagement with said roller.

ROBERT F. MORRISON.

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