US2155692A - Duplicator - Google Patents

Description

April 25, 1939.

F. wv sToRcK DUPL I CATOR Filed Jan. 22, 1938 3 Sheets-Sheet l rovefllfbr 646713075 141163507076 April 25, 1939. w STORCK 2,155,692

DUPLICATOR Filed Jan. 22, 1938 3 Sheets-Sheet 2 April25, 1939. F W. STORCK DUPLICA'IOR '3 Sheets-Sheet 3 Filed Jan. 22, 1938 E l a Patented Apr. 25, 1939 UNITED STATES PATENT OFFICE to Standard Mailing Machines Company,

Everett, Mass, a corporation of Massachusetts Application January 22, 1938, Serial No. 186,407

7 Claims.

This invention relates to a machine for duplicating imprinted matter formed by means of a so-called hectograph or duplicating ink, and the invention more particularly relates to a novel printing drum and a supporting frame for the drum and the operating elements of the machine.

A machine employing the conveniently termed wet process method of duplicating is shown and described in United States Letters Patent Re.

' 19,951. In utilizing this process of duplicating, a master copy is formed in reverse with a dissolvable copying ink and the master copy secured to a rotatable drum with the reverse characters facing outwardly. A clear moistened sheet is engaged under pressure with the master copy and the moisture of the sheet dissolves sufiicient of the master character ink to form an inverse du-v plicateof the reverse master characters.

Hereto-fore, machines of the present character, for producing duplicate copies, have required a cost of manufacture that did not permit. of their being readily purchased by a large class of possible or potential users. In the manufacture of a practical and efficient duplicating machine, the operating elements of the machine must be suitably supported in frames that are of a rigid construction so that the machine elements may be properly positioned and adjusted to function uniformly and with an even degree of pressure. Further, the printing drum or platen must be of a rigid construction and such that will permit of suitable means being assembled therewith in a manner so that the master copy may be easily and conveniently attached to or removed from the face of the drum. Again, in machines of the above referred to character, it is essential that the printing drum positively rotate in a direct relation to other elements of the machine so that a clear moistened sheet may be fed to register in proper engagement with. the master copy. Ma-

chines adapted to these conditions have heretofore been considered as requiring a substantially heavy frame construction with a printing drum requiring an extreme degree of workmanship in effecting a master sheet clamping device and the assembling of associated parts with or within the drum.

Accordingly, one of the primary objects of the present invention is to so construct and arrange elements of a duplicating machine in a manner that will permit of reduced manufacturing costs and without impairing the emciency of the elements of the machine.

Another object of the invention is to provide a printing drum of a novel and simple construction that may be conveniently manufactured and assembled together with its immediate coacting elements. P v v A further object of the invention is to provide a'supporting frame for the operating elements of the machine that may be formed of a continuous sheet of material and in a manner that greatly assists in reducing the cost of producing the completed machine.

A still further object of the invention is to'provide the frame with depressed areas forming ribs in a manner that increases the rigidity of the frame and, at the same time, enhances its appearance.

With the above and other objects in view, the invention comprises a novel construction and arrangement of parts hereinafter described and more specifically pointed out in the appended claims.

The accompanying drawings illustrate a preferred embodiment of the present novel structure with a wet process duplicating machine sufficient to enable those skilled in the art to understand the construction and operation thereof.

It is known that, heretofore, separate side frames for machines have been made that utilize a substantially lightweight sheet material and invariably these separate side frames have required a separate base to which the side frames are attached so as to lend rigidity to the frames. In the present instance, it has been found that a base and side frame may be integrally formed and whereby the cost of production and assembly may be greatly reduced and facilitated.

Referring to the drawings:

Fig. 1 is a perspective view of the duplicating machine frame with the operating elements of the machine assembled therein.

Fig. 2 is an end elevation'of the operating elements of the machine as viewed with one of the sides of the frame omitted.

Fig. 3'is a fragmentary sectional view taken along line 3-3, Fig. 2.

Fig. 4 is a longitudinal section of the duplicating machine printing drum of platen with the master sheet clamp and operating means mounted therewith.

Fig. 5 is a transverse section taken substantially along line 5-5, Fig. 4.

Fig. 6 is a vertical section through the detachable printing drum or platen end, and- Fig. '7 is an end view of the detachable drum end shown at Fig. 6, viewing in the direction of arrow at, same figure.

The machine frame The frame adapted to support the operating elements of the duplicating machine comprises a base Ill of a suitable sheet metal material with opposed upwardly extending side walls Illa formed integral with the base I0. These side walls Illa are retained in a rigid spaced-apart relation by means of suitable tie rods or members H, [2, I3 and I4. In the present frame'construction, the opposed side walls Illa are provided with depressed channels Illb that form ribs lllc extending along the contour of the walls Illa and, besides enhancing the appearance of the side walls, these ribs Illc effect a more rigid structure than that formed by the sheet of material.

Operating elements of the duplicator generally indicated at l6, and to be later de-.

scribed in detail, is rotatably supported on the shaft I5 and is provided with a coacting pressure ,roller I! having pressure adjusting means associated therewith.

Rotatively mounted in the frame is a shaft I8 which has secured thereto a combined moistening and feeding roller l9. One end of the shaft l8 projects beyond the side wall of the frame and is provided with an operating lever by which the roller I9 may be rotated. Operatively associated with the shaft 3 and roller I9 is a gear 2| that meshes with an intermediate gear 22 that.

f in turn, engages with gear teeth 23 by which the drum I6 is rotated. A roller 24 is rotatively supported in the frame and closely engages with the combined feeding and moistening roller l9 and in a manner whereby the roller 24 is frictionally driven by the combined feeding and moistening roller Was this roller I9 is rotated.

When the roller I9 is rotated, by the lever 20 or other suitable means, the face of the roller I9 receives a thin film of moisture from a wick 25 that has one edge thereof in engagement with the peripheral face of this roller and its opposed edge portion in engagement with a supply of fluid maintained in a suitable fluid receptacle 26. r

A duplicating machine substantially embodyiing operative elements of the above general charreferred to patent Re. 19,951.

acter, and their functions in producing a duplicate copy of matter formed in reverse with a suitable copying ink on a master copy, is illustrated and. described in detail in the previously Further detailed description of the machine elements and their functions is thought to be unnecessary in view of the above and they are generally illustrated for the purpose of showing their cooperative relationship with the herein present improvements and are not intended as limiting the im-v provements thereto.

The printing drum or platen present instance, with areas I 61), I60 increased in thickness for a purpose to be hereinafter described. The drum shell wall Ilia is provided with an integral end wall IBd having a hub I69 with a bore l6 for engagement with the supporting shaft IS. A detachable end wall 21 is adapted to be secured to the opposed end of the shell wall lBa so as to form a substantially en- ;closed drum chamber l6g within the drum. This detachable end 21 may be attached to the shell end wall by means of screws or the like (not shown) that engage with threaded bores 28 in the increased thickness areas l6b of the shell. This permits the shell wall l6a to be relatively thin, although it is obvious that this wall may be of a suflicient thickness to accommodate the threaded bores 28, or other suitable and well known means may be employed for detachably securing the end 21 to the end annulus shell wall l6a.

It is to be noted that, in order to further reduce the manufacturing costs of the printing drum or platen, the gear teeth 23, by means of which the drum is rotated, are formed integral with the detachable end wall 21.

The opposed end walls Hid, 21 are preferably provided with openings lBh, 21a that permit a limited access to the drum chamber, when the drum is assembled, and further lighten the completed drum structure.

Master sheet clamp communicates with the interior chamber I6g of the drum by means of equi-spaced openings 30 so as to permit the depending extensions 3la of the clamp members 3| to engage in the drum chamber 16g. These clamp members 3| have a pivotal bearing against the bottom of the longitudinal slot 29 and each depending extension 3Ia thereof is attached to one end of a pull spring 32, the opposed ends of the springs 32 being attached to a stationary rod 33 suitably connected to the opposed drum ends lid, 21. are preferably disposed in an angular position so as to effect a pivotal seating of the-clamp members 3|, together with eifecting a resilient pivot for the extensions 3la and, when in operative position, cause the outer edges 3Ib of the clamp members 3| to closely engage with one sid Wall 29a of the longitudinal slot 29.

An operating rod 34 is rotatably supported in the drum chamber and longitudinally disposed The springs relative to the clamp member extensions 31a. 1

One end of the operating rod 34 extends outwardly beyond one end of the drum and is provided with an operating knob 34aor like device by means of which the rod 34 may be rotated when desired.

Suitably secured to the rod 34 is a cam member 35 that is adapted to engage with the extensions 3la, when the rod 34 is rotated, to actuate the clamping members 3| in the slot or recess 29. A sheet clamping device of the above character is fully shown and described in United States Letters Patent No. 2,093,385, issued September 14, 1937, therefore further detailed description of the herein illustrated clamping device is thought to be unnecessary as it sufficiently points outthe,

advantages of the present novel drum structure in permitting of a convenient assembling of the elements within the drum.

Having thus described my invention, what I claim is:

1. A duplicating machine having a frame formed of a continuous sheet of material formed to a desired contour and comprising a base and side walls extending upwardly from opposed sides- 2. A duplicating machine having a frame formed from a single sheet of material of a desired contour and including a base and side walls extending upwardly from opposed sides of said base and adapted to support the operating elements of said machine, a channel formed along the edges of said side walls, together with members extending between said opposed side walls.

3. A duplicating machine having a frame integrally fashioned from a single sheet of material and including a base and integral side walls extending upwardly from opposed sides of said base and adapted to support the operating elements of said machine, said frame having depressed areas therein to fbrm ribs in said frame, together with separate tie members extending between said opposed side walls.

4. A duplicating machine including, in combination, a frame, a printing drum having a substantially continuous peripheral face and rotatably mounted in saidframe with means for rotating said drum, means for securing a master copy to said drum, elements mounted in said drum and operably associated therewith, a pressure roller mounted in said drum and adapted to coact with the face of said drum with means for adjusting the pressure of said roller relative to said drum, said drum embodying a substantially continuous cylindrical face wall with an integral end wall, together with a detachable opposed end wall with means for securing said last end wall to said cylindrical wall.

5. The combination as recited in claim 4 wherein one ofv said opposed drum end walls has a driving member formed integral therewith with means engaging with said member and whereby said drum is rotated.

6. A duplicating machine having a rotatable printing drum formed with a substantially continuous cylindrical wall with a longitudinal slot extending through said wall and an integral end wall forming a chamber within said drum, elements assembled within said chamber and operably associated with said drum, a detachable end wall for said drum and chamber that permits assembling said elements within said drum chamber with means for securing said last end wall to said drum, one of said end walls having driving means integral therewith with other means engaging with said driving means and whereby said drum is rotated. I

7. A duplicating machine having a rotatable printing drum formed with a substantially continuous cylindrical wall with a longitudinal slot extending through said wall, said cylindrical wall having opposed apertured end walls forming a substantially enclosed chamber'within said drum, elements assembled within saiddrum chamber and operably associated with said drum, at least one of said end walls being detachably secured to said drum to permit removal thereof and whereby operations may be performed within said drum chamber.

FREDERICK W. STORCK.

Images