US2260045A - Paper feeding means for duplicating machines - Google Patents

Description

9 R. F. MORRISON ETAL. 2,260,045

PAPER FEEDING MEANS FOR DUPLICATING MACHINES Filed May 1, 1939 3 Sheets-Sheet 3 fig 5 7 Q6 6/ 60 55 67 6/ 0 70 56 57 63 1 I I I i *ZMWW Mam,

A ORNEYS.

Patented Oct.- 21, 1941 UNlTED STATE s. PATENT OFFICE PAPER FEEDING MEANS FOR DUPLICATING MACHINES Robert F. Morrison, Oak Park,-

11}ii assignors to Wimmer, Chicago, corporated, Chicago, Virginia and Glen E.

Ditto, Ina corporation of West Application May 1, 1939, Serial No. 271,108

11 Claims.

' is to be transferred are fed from a tray to the drum by a pair of spaced feed rollers which engage the blank sheets before any ink has been applied tothe sheets. We have found that this feeding of clean sheets by clean rollers has a detrimental effect upon the master sheet in cases where the forwarding rollers are positioned for contacting the sheets at the points where the ink later is spread. This detrimental effect is evidenced by theproduction of copies having Fig. 2 is a. plan view of the duplicating machine of Fig. 1;

- Fig. 3 is an enlarged tray; i

Fig. 4 is a plan view of the feed tray of Fig. 3; Fig. 5 is a vertical sectional view taken substantially at the line 55 of Fig. 4;

Fig. 6 is a view similar to Fig. 5 but showing side elevation of the feed a changed position of the parts;

Fig. 7 is a vertical sectional view taken substantially at the line 1-1 of Fig. 4;

Fig. 8 is an enlarged face view of a. feed roll unit, partly in section;

zones where the printing is appreciably lighter than at adjacent points, the differences becoming more and more pronounced as the printing proceeds until finally the master sheet is discarded and a fresh one is employed.

We have found that we can avoid this difliculty by providing that the forwarding rollers shall engage only the side margins of the clear sheets at points which do not later come into contact with the inked portions of the master sheet. We

have found that by changing the arrangement of the forwarding means for accomplishing this purpose we have very greatly increased the effective life of a master sheet and very greatly improved the quality of the printing. Under these circumstances, it is one of the objects of our invention to provide an improved arrangement of the forwarding rollers and their supporting and driving means so that the rollers can be very easily and quickly shifted to any desired position transversely of the machine.

Our invention comprises also improved means for holding the copy sheets yieldingly in position on the tray by engagement with the side edge faces of the pile of sheets, for assisting in the control of the paper as it is fed forwardly by the rollers.

It is another object of our invention to improve machines of this type in sundry details hereinafter pointed out. The preferred means by which we have accomplished our several ob- .jects are illustrated in the accompanying drawings, in which- Fig. 1 represents a side elevation of a duplicating machine incorporating the novel feeding mechanism;

Fig. 9 is a vertical sectional view taken substantially at the line 9-9 in Fig. 2 but with the feed rollers in changed position; and

Fig. 10 is a vertical sectional view taken substantially at the line I'll-l0 of Fig. 9.

Referring now to the drawings for a detailed description of the invention, l0 represents the frame of the duplicating machine, having a feed tray ll mounted thereon for supporting a pile I2 of copy sheets. The copy sheets are moved forwardly (toward the right in Fig. 1) by the feeding mechanism hereinafter described to forwarding rolls l3. and I4, the'roll 13 serving additionally to moisten the upper surface of the copy sheet as it passes therethrough. The solvent is applied to the roll I3 by a solvent feeding mechanism 15, the details of which form no part of this invention and accordingly will not be described here. From the forwarding rolls I3 and M, the copy sheet passes to a drum it against which it is held by an impression roller ll. Suitable means (not shown) is provided for driving the drum l6 so that it is rotated to cause an impression to be made upon the copy sheet from a master sheet carried by the drum. The copy sheet is ejected from the drum upon a delivery tray I8 which is positioned below and to the right of the drum I6.

Cooperating with the forward portions of the copy sheets I2, that is, the portions nearest the forwarding rolls l3 and M, are two feed rolls I9 and 20. Each of the feed roll units comprises a ring H of friction material such as rubber or the like which is mounted on a wheel 22 which has a tubular extension 23 on one side thereof which serves as the mounting means for the wheel. The rubber ring 2! is preferably cut away at one side at 24, the purpose of which is to reduce the peripheral face of the roll so that the roll may be used with sheets having a relatively narrow margin without unduly sacrificing stiffness. The ring 2! is retained upon the wheel 22 by means otlateralflanges acarriedbythewheelfl. The rollanditstubularextemionareslidablymolmt- -edonadriveshait2liiattenedatonesideiace,

9300,0415 I a a I a members I: in openings in which hollow studs liareflxedlymountedasisbestshowninl 'igfl.

' Abushingllisrotatablymountedineachoithe beingreleasablysecuredinadiusted-mlltionby' asetscrewflcarriedbytheextension.

Theshai'tldisdrivenbymeansoisprocket wheelsilandllandachainlliromatransverseshaitll. Saidtransverseahaitflis mountedontheirame ll oitheduplicatingma-- chineashort distanceinrearoitherolls "and I. and is driven intermittently in timed relation with the drum II so that the operation of the rolls is likewise intermittent. In the arrangement shown, the slmit II is movably supported iromtheshaitflbymeansoianarmilinthe form 01' a housingadapted to swing vertically about the shait 34. The amount of pressure exertedbytherollsuponthecopysheetsisregulatedbyatensioningmeansllthedetailsoi which do not iorm a part oi this invention and hence are not described here.

The ieed rolls ll, 2. are normally positioned on the shait 28 in the manner shown mm. 2;

' that is, with the extensions 23 turned inwardly.

when so positioned the rolls are adapted to be adjustedsoastoengagethesidemarginsoithe copy sheets, being adjustable through a considerable range transversely of the machine for use with sheets oi diiierent widths. It is sometimes desirable, however, to have the forwarding rollers engage the intermediate portions oi the sheets regardless of the disadvantages, and particularly when the copy sheets are required to be passed through the duplicating machine a second time to impress additional material thereon. Re-run sheets have a tendency to buckle at their central portions so that they do not lie flat when they reach the forwarding rolls l3 and I. When the feed rolls I! and II are so spaced as to contact the central portions oi the sheets, these portions will enter the advancing rolls l8 and I4 without diiliculty and the side margins of the sheets will assumetheproperpositionontherolls. Topositlon the feed rolls II and II centrally oi the sheets,allthatisrequiredistoreversethe molmting means so that the extensions 23 projectoutwardlyinsteadoiinwardly.

'lheieedtrayllcomprisesashortmetalplate as having depending flanges 4| atthesides thereof,asisbestshowninn'g.9,suchtraybeing removably secured inposition on the irame II by any suitable means not illustrated in detail. In the arrangement shown, the tray is locked in place by means of a latch l2 pivotally mounted onthe trayandadaptedtoengageatransverse rod 43 on theirame |l,asshowninFig. l, for locking the tray against movement with respect to the rod.

The copy sheets are positionedon the tray ll bymeans oisidemarginbarslland inthe formoianglesasshowninFig.9,suchbarsbeing adjustably mounted on the tray. As is best showninl 'igs.3and4,eachoithemarginbars is provided with a stud II which projects downwardly into a lateral slot I! in the tray. Springs 4! acting against washers on the studs hold the forward ends of the margin bars against the tray. At their rear end portions, the bars 45 and 46 are provided with studs 5| which project downwardly through lateral slots 5; in the tray, having nuts 53 secured by screw-threads on their lower ends for tightening the rear end portions of'the margin bars against the tray.

At their rear end portions, the margin bars 45 and 46 are provided with brackets or housing studs ll, with a pin I. extending through each of the bushings into rigid iixed engagement with a plate I slidable sidewise in the housing II. A block oi sponge rubber II is glued or otherwise secured to the plate CI. The outer end of the pin It is threaded to receive an adjusting nut 68 and a lock nut N which serves to lock the adjusting nut It in place on the pin.

Upon the bushing ll between the stud I! and the adjusting nut 83, we have mounted a lever GI provided with a rib it thereon adapted in the pofltion oi the lever as shown in Fig. 5 to engage agroove II in the outer end of the stud 55. When the lever is rotated upwardly through approximately the rib O8 is cammed out oi the notch or groove 61 so as to move the adjusting nut 83 and the pin 58 outwardly for moving the plate I and the rubber block I from the position as shown in Fig. 5 to the position as shown in Fig. 6. The rib ll serves thus substantially as a latch for holding the lever I in either its operative position as shown in Fig. 6 or in its inoperative position as shown in Fig. 5. The amount of movement provided by the rib 6. is such that the rubber block 8| will be withdrawn completely into the housing 55. When the lever ii is rotated back the same amount so that the rib it is in registry with the notch 61, the rubber block 8| protrudes from the housing 55 and contacts the side iaces oi the pile oi copy sheets on the tray. A compression spring II is inserted between the plate ill and the stud it so as normally to press the plate 6| inwardly. The amountthat the rubber block OI protrudes from the housing 55 may be regulated ,by the adjusting nut 63. By backing the nut 63 oil the pin it more or less, the rubber block 6| will be made to protrude a greater distance out of the housing I and when the nut I3 is adjusted inwardly on the pin II the amount of protrusion may be decreased. The selected position oi the nut 63 on the pin I. is assured by advancing the lock nut 04 againstthenut! It will be noted that the side margin bar 46 is notched at Ii (see Fig. 6) .to permit the rubber block CI to extend slightly below the surface oi .the bar, thereby insuring contact between the block and the lowermost sheet oi the stack oicopy heetslionthetmy.

To prevent the bottom sheet oi the stack oi copy sheets from being inadvertently drawn ior ward by the feed rolls II and II, pads 13 are pro vided on each side oi the margin bar under the rolls, each of which pads is preferably iormed with small protuberances to increase the holding ability oi the pad.

It is derstood that the foregoing description is merely illustrative of a preferred embodiment oi the invention and that the scope oi the invention, therefore, is not to be limited thereto but is to be determined by the appended claims.

We claim:

1. In a paper ieeding mechanism, the combination of, a table adapted to support a pile of copy sheets, paper feed means a'djustable transversely of the table so as to be brought into operative engagement with the side margins of the'top sheet of the pile on said table and reversible sheet in either of 'itsreversible positions for feeding said top sheet edgewise from the pile.

2. In a paper feedingmechanism, the combination of, a table adapted to support a pile of copy sheets, a shaftextending across above the table transversely thereof and movable toward and away from the table closely adjacent to the front edge of said pile of sheets, paper feed rollers mounted on said shaft so as to be rotated thereby and so as to be adjustable therealong into operative engagement with the side margins of the top sheet of the pile on said.table,"and means for giving said shaft intermittent rotary movements in the direction for causing said rollers to carry the top sheet forwardly edgewise from the pile.

3. In apaper feeding mechanism, the combination of, a table adapted to support a pile of copy sheets, a shaft extending across above the table transversely thereof, paper feed rollers each having a tubular bearing member extending from one face and mounted on said shaft so as to be rotated thereby and reversible for causing the tubular bearing members to extend either inwardly or outwardly, means carried by said rollers for holding the rollers in adjusted position along the shaft, and means for giving said shaft intermittent rotary movements in the.direction for causing saidrollers to carry the top sheet forwardly edgewise from the pile.

4. In a paper feeding mechanism, the combination of, a table adapted to support a pile of copy sheets, an arm pivotally mounted on a fixed axis above said table so as to swing toward and from the table at about the middle portion of the table transversely, a shaft rotatably mounted on said arm at an intermediate point along the shaft so as to be movable vertically withthe arm-closely adjacent to the front edge of said pile of sheets and extending toward the sides of the table, paper feed rollers mounted on opposite end portions of said shaft so as to be rotated by the shaft and so as to be adjustable along the shaft into operative engagement with the side margins of the top sheet of the pile on the table, and means for giving said shaft intermittent rotary movements in the direction for causing said rollers to carry the top sheet forwardly edgewise from the pile.

5. In a paper feeding mechanism, the combination of, a table adapted to support a pile of copy sheets, a shaft extending across above the table transversely thereof, paper feed rollers having body portions formed of rubber each comprisingaa short cylindrical portion and a reinforcing tapered portion, said rollers being mounted on said shaft so as to be rotated thereby and so as to be adjustable therealong into operative engagement with the side margins of the top sheet of the pile on said table, and means for giving said shaft intermittent rotary movements in the direction for causing said rollers to carry the top sheet forwardly edgewise from the pile. I

6. A feed roller unit comprising in combination a metallic tubular member, a head on one end of said tubular member, and a roller formed of rubber on said head and comprising a short cylindrical portion and a reinforcing portion formed integrally with the cylindrical portion and tapering toward said tubular member. '7. In a paper feeding mechanism, the combination of, a table adapted to support a pile of copy sheets, means adapted by engagement with the top sheet of the pile to forward said sheet edgewise from the pile, brackets at opposite sides of the table, pressure plates at opposite sides of the pile of sheets having pins extending outwardlyihrough openings in said brackets with nuts adjustably mounted by means of screwthreads on the outer ends of the pins so as to limit the inward movement of the pressure plates, springs serving normally to press said plates to the limitof their movement inwardly, levers rotatable about said pins, and cam means controlled by movements of said levers for moving said pins outwardly against the action of said springs for carrying said pressure plates out of their normal'operative pressure positions with respect to said pile of sheets.

i 8. In a paper feeding mechanism, the combination of a table adapted to support a pile of copy sheets, means adapted by engagement with the top sheet of the pile to forward said sheet edgewise from the pile, a pressure plate at one side at least of the pile of copy sheets for applying a frictional braking effect on the sheets for holding them yieldingly against forward movement, spring means normally pressing said pressure plate inwardly, adjustable means for limiting the inward movement of said pressure plate comprising a pinextending outwardly from said pressure plate through an opening in a in one position by holding engagement with said adjustable means to hold the pressure plate out of operative position with respect to said pile of copy sheets and adapted when moved into an alternative position to permit said spring means to return the pressure plate to operative pressure relationship to said pile of sheets,

9. In a paper feeding mechanism, the combination of a table adapted to support a pile of copy sheets, margin bars along opposite sides of the table adjustable transversely thereof for p0 sitioning said pile of copy sheets, means adapted 45 by engagement with the top sheet of the pile to forward said sheet edgewise from the pile, brack-= ets carried by said margin bars near their rear ends, pressure plates mounted on saidbrackets respectively and movable transversely of the matent beyond the inner faces of the margin bars for engagement with the side faces of said pile of copy sheets, pins connected with said pressure plates and extending outwardly therefrom through openings in said brackets, springs mounted on said pins so as normally to move said pressure plates inwardly, 'nuts secured by screwthreads on the outer end portions of said pins for limiting the inward movement of said pressure plates by said springs, and a member movably mounted in operative relation to at least one of said pins adapted in one position to prevent inward movement of said'pin so as to hold the attached pressure plate in outwardly retracted position with respect to the margin bar on which the plate is mounted and out of engagement with said pile of copy sheets and adapted when moved into an alternative position to permit the spring bearing on said one pressure plate to return the to said pile of sheets.

10. In a paper feeding mechanism, the com-- chine for projection inwardly to an adjusted expressure plate to operative pressure relationship sitioning said pile oi copy sheetamesns adapted said pressure plates inwardly, adjustable means for limiting the inward movement of said pressure plates comprising pins extending outwardly from said pressure plates through openings in said brackets, and nuts secured .by screw-threads on the'outer end portions of said pins, and latch means movably mounted in operative relation to said pins' adapted in one position by holding engagement with said adjustable means to hold the pressure plates in outwardly retracted position with respect to said margin bars and out or engagement with said pile of copy sheets and adaptedwhen moved into an alternative position to permit said springs to return the pressure plates to operative pressure relationship to said pile of sheets.

11. In a paper feeding mechanism, thecombip .by engagement with the top sheet a: the pile to wise from the pile, means for applying a iric- 25 Pile oi copy sheets.

nation of same adapted to mart a pile or copy sheets, means adapted by engagement with thetopsheetoi apileio iorwardsaidsheetedgetional grip on the sheets for holding them yieldingly against forward movement and comprising a pressure plate at one side at least of the pile,

spring means normally pressing said pressure plate inwardly, a lustable means for limiting the inward movement of said pressure plate comprising a pin extending outwardly from said pressure plate through an opening in a bracket ad- Justable transversely with respect to said table, a nut mounted by means or screw-threads on said pin, and a cam lever pivotally mounted on said pin between said bracket and said nut so astobeswingableaboutthepin adaptedinons position to have operative engagement with a notch insaid bracketso as to permitsaidspring mum to hold the pressure plate in operative pressure relationship to said pile of sheets and adapted in another position to engage the bracket in spaced relation to said notch-so as to hold the pressure plate out of prusure relationship to said ROBERT F. nonmson. 0mm 1:. wmmm.

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