US2094628A

US2094628A - Duplicating machine

Info

Publication number: US2094628A
Application number: US61860A
Authority: US
Inventors: Dean H Whitehead
Original assignee: JOHN R NALBACH
Current assignee: JOHN R NALBACH
Priority date: 1936-02-01
Filing date: 1936-02-01
Publication date: 1937-10-05
Anticipated expiration: 1954-10-05

Description

fOrct. .5, 1937.

D.. H. WHlTEHEAD DUPLIGATING MACHINE Filed Feb. 1, 1956 3 sheets-sheet `1v ATTORNEY.

oct. 5, 1937.

D. H. wHlTl-:HEAD DUPLICATINGMACHINE 'Filed Feb.l 1, 1956- .5 Sheets-Sheet 2 ATTORNEY.

Oct.`5, 17937. D. H. wHrrEHr-:AD

` DUPLICATING MACHINE FiledFebi. 1f 1956 s rshams-sheet 3 ATTORNEY.

Patented Oct. 5, 1937 PATENT OFFICE DUPLICATING Dean H. Whitehead, Chicago, Ill., assignor of one-halfto John R. Nalbach, Oak Park, Ill.

Application February 1, 193s, serial No. 61,860

s ciaims. (ci. 10i-132) d This invention relates to duplicating machines.v One object of the invention is to provide an improved stripping mechanism for removing copies from the rotary drum of a duplicating or .like printing machine. d

p Another object of the invention is to provide a margin bar mechanism of simple construction and operation. f l V,

A further object of the invention is to provide an improved clip for the ends of a master, such'as a gelatin duplicating band and by means of which 4the master can be secured tautly to a rotary drum. Another object of the invention is to provide a duplicating machine provided with a movable l 415 margin bar and a stripping mechanism which are operable in properly timed relation with respect to the rotary movements Lof a drum preferably by a single cam operable with the drum. Y

Other objects relatetovarious features of con- `struction and arrangement of parts which will be apparent from a consideration of the following specification and accompanying' drawings, wherein: l

Figurel is a top plan view of a duplicating machine of the gelatin band type parts of which have been `broken away for the purpose of clarity. Figure 2 is a section taken on line 2-2 `of Figure l. l I Figure 3 is a section taken on line 2-2 of Figure l, but illustrating the drum and certain associated parts in different operative position. I

Figure 4 is a broken perspective view of a clip :for securing a master to a drum.

Inthe drawings I0 andi I are side frame mem- `bers secured in spaced relation by means of transverse bars I2 at the two lower corners of the frame and'at therear upper corner thereof. A tie rod d I3 adjacentthefront of the machine is also provided.l A rotatable shaft Il is carried by the frame upon which is secured a rotary drum indicated generally by the numeral I5'.v The drum comprises two end walls I6 and I1 and asemicylindrical shell rI8 whichas shown in Figures 2 V and 3 have inwardly directed ends `I9 and 20. The inwardly directed ends define a longitudinal recess in the periphery of the drum, the recess being designated by numeral 2I.

Wherethe improvements are to be used as a conventional gelatin band type duplicator the flange I9 is provided witha number of hooks 22 for the engagement of a suitable clipj23 which is secured to the end of the gelatin band- 2L Withl in the drum adjacent the opposite flange-20 a tensioning deviceis provided comprising arms 25 swingablyi mounted on a longitudinal rod 26 carried by the ends I6 and I1. y

yMA spring 21 isprovided which tends to move the arms 25 counter-clockwise as viewed in Figures 2 and 3, the spring being attachedat one end of one of the arms and anchored at the opposite end toa stud 28 also carried by the adjacent end wail I6 of the drum. 'I he tensioning device is also provided witha stop arm 2S arranged to abut the inner surface of `the drum shell to limit the counter-clockwise movementr of the tensioning device.

To position a gelatin band or other reverse master on the drum a clip 23 is caused to engage the hooks 22 and the band drawn around the drum, and a second clip 30, similar to clip 23 but secured to the opposite end of the band, is hooked over `the ends of the arms 25, the arms having first been suitably retracted against the action of the spring 21. ,The spring, as will be seen, hold the band taut upon the surface of the drum. After the gelatin band has been placed in position the original sheet, of which copiesare to be made, ivsfed into the machine and stripped therefrom in the same manner as that described hereinafter with respectto the feeding and stripping of copy sheets, except that the original is permitted to remain in contact with the band for a period adequate to enable the ink to be transferred from the original to the band.

An impression roll 3I is disposed between the frame members adjacent the forward end of a paper feed table 32. `The roll 3l is 'carried by arms 33 pivoted at 34 to the framemembers I6 and I1. Springs 35 are securedeach at one end to one of the arms 33 and at the opposite end to a stud 36 carried onthe frame for exerting'downward tension of the arm to press the roll into contact with the surface of the drum or into contact with the surface of the copy sheet carried thereby as hereinafter explained.

As shown in Figures 2 and 3 the frame members may be provided with inwardly directed lugs 31 carrying set screws 38 against whicnthe rear ends of thearms abut vfor limiting the downward movement of the roll 3| under the action of the springs 35.

Adjacent the impression roll 3I is a rod or shaft 38 which is carried by the side frame members and is provided with arms 40 to which is attached a margin'v bar-4I which is V-shaped in cross section as shown in Figures 2 and 3.- The normal disposition of the margin bar 4| is such that when a copy sheet 42 is fed forwardly from the table 32 beneath roller 3| it will be engaged by the margin bar 4|.

A spring 43 secured to a stud 44 and to one of the arms 40 is provided to swing the margin bar counter-clockwise as viewed in Figures 2 and 3 and away from the periphery of the drum to the dotted line position shown in Figure 3. Secured on the shaft I4 adjacent the drum ends I6 are similarV cams 45 of the shape shown in

Figlures

2 and 3. A lever 46 is pivotally secured at 41 to the frame member I9 and at its lower end is provided with a cam follower roller 48 for contacting the adjacent cam. while the upper end extends into contact with the rear surface of the margin bar 4I. Figure 3 shows a copy sheet 42 slid forwardly on the feed table 32 against the margin bar 4|. It will be seen that as the drum rotates a short distance clockwise from the position shown in Figure 3, the roll 3| will press the sheet against the master carried by the drum and that at this point of engagement the sheet will be fed forwardly due to the coaction of the impression roll and the drum. At the point where the sheet tends to be fed forwardly as stated, the cam follower roller 48 will be clear of the raised portion 45a of the cam whereupon the spring 43 will snap the margin bar and the lever 46 to the dotted line position shown in Figure 3. The copy sheet will thus travel with the drum as the latter rotates vuntil stripped therefrom by thev stripping mechanism about to be described.

The stripping mechanism comprises a stripping roll 49 journaled in the frame members I0 and and provided with a'pinion 50 which meshes with the gear 5| rotatable with the shaft I4. The ratio of the gear and pinion is such that the peripheral speed of the stripper roll 49 is equal to the peripheral speed of the drum. The stripper roll 49, as shown in Figures 2 and 3, is disposed outwardly of the periphery of the drum and beneath the feed table 32 so that each copy sheet remains in contact with the duplicating master during the period required for any point of the drum to move clockwise from the impression roll 3| to the stripper roll 49.

The stripping mechanism comprises also a deflector member in the form of a roll 52 mounted on a shaft 53 rotatably carried by two arms 54 which are pivotally connected at to two levers 56. The levers 56 are pivoted at 5`| to the adjacent side frame members. Both of the levers 56, only one of which is shown in Figures 2 and 3, are provided with cam followers 58 which contact the respective cams 45. The arms 54 and levers 56 provide an articulate structure which is operatively controlled by the cams 45 for moving the copy sheet deecting roll 52 inwardly and outwardly of the drum recess 2| in timed relation with respect to the rotary movement of the drum for engaging the forward end of the sheet which projects over the advancing end of the drum and moving it into contact with the stripper roller 49 to strip the sheet from the drum.

As shown in Figures 2 and 3, springs 59 are secured to each pair of arms 54 and levers 56 which tend to swing the arms clockwise about the pivot 55 for the purpose of retaining rollers 6U, mounted in the end of the shaft 53, (see Figure 1) in contact with guide members 6| which are secured to the frame members I0, I I. Springs 62 are secured to each arm 56 and to the stud 36 for swinging the levers in a direction to retain the followers 58 in contact with the surfaces of the respective cams.

In viewing Figure 2 it will be seen that as the projecting end of the copy sheet 42 approaches the stripper roll 49, levers 56 will be moved from the position shown in Figure 3 to the position shown in Figure 2, by the raised portions 45a of the cams. This movement will be effective against the tension of the springs 62 and will draw the deector roll 52 into the recess of the drum to the position shown in Figure 2. The projecting end of the copy sheet will, therefore, move in between the

spacedapart rolls

49 and 52. It will be seen that as the drum rotates farther in a clockwise direction from the position shown in Figure 2, the followers 58 will move under the action of the springs 62 from the raised portion 45a of the cams to the portions 45h, thus suddenly moving the defiector roll 52 outwardly beyond the periphery of the drum and carrying with it the projecting end of the sheet 42. The guides 6| along which the guide roller 60 rolls will direct the defiector roll 52 against the driven stripper roll 49 whereupon the paper will be stripped from the master as the drum continues to rotate. The sheet being stripped' will be engaged by a paper guide plate 63 which is located above the stripper roll and delivered into a tray 64 asshown in Figure 3.

The above described embodiment of the invention is shown provided with an operating handle 65 for manual operation.` It will be seen that an operator can rotate the drum by means of the handle and the copy sheets fed against the margin bar during the period required for the drum to rotate from the position shown in Figure 2 to approximately the position shown in Figure 3. As the pressure roller 3| comes into contact with the paper to press the same against the master, the margin bar snaps to the dotted line position shown in Figure 3 and as a projecting end of the paper reaches the stripping position the deflector roll will snap into the recess 2| of the drum to engage the lower surface of the projecting end and then move outwardly as described to press the sheet against the driven stripper roll 49 to provide a positive stripping action. The operator with a little practice can thus continuously rotate the drum with one hand and with the other hand feed the copy sheets against the margin bar, asdescribed. y

In Figure 4 the improved clip 23 is shown in broken perspective. This clip is formed of relatively thin sheet metal and comprises two integral leaves 23a and 23D, the former folded upon the latter. The leaf 23h is provided with a folded over end or flange 23e providing a hook beneath which is the folded end 24a of the' master 24. In attaching the clip to the master the end of the master is folded over and slipped beneath the flange 23o after which the leaf 23a, which may be in partially folded position, is pressed downwardly to the position shown in Figure 4. The leaves 23a and 23h are provided with registering apertures to provide the openings 23d, the metal tongue 23e of the cutout of leaf 23h being folded upwardly through the opening of. leaf 23a and pressed vdownwardly upon the surface thereof to form a fastener which holds two leaves together and effects the firm gripping of the end of the master therebetween. v'Ihe openings 23d inthe clips 23 provide ymeans for attaching the clips to the hooks 22 and arms 25 as above described.

Another feature of convenience of the present improvements is that the pressure roll 3| can be swung to the inoperative position indicated by dotted lines in Figure 3, in which position the arms 33 abut the lugs 31. Due to the fact that the springs 35 move past the pivotal axis of the arms 33 in being swung to the elevated position shown in said figure, the roll is retained in the'y temporarily elevated positionby the tension of i the springs. While in elevated position the roll can be cleaned conveniently and access to the upper portion of thejdrum is facilitated, as for placing the band thereon or for placing on the band the original copyl of the matter to be duplicated. While I have shown and` described certain embodiments of `my improvements for the purpose A of illustration, I do not wish to -be restricted specifically thereto .except `as so limited by the appended claims.

1. A machine of vthe class described comprising a rotary copy-sheet carrying drum having a `longitudinal recess in the surface thereof, means for effecting the disposition of a copy sheet on the drum with onejend projecting over said recess, and means for stripping the sheet from the drum comprising a driven stripper roll disposed beyond the periphery V'of the drum and a cam controlled sheet defiector roll movable inwardly and outwardly of said recess for'engaging said projecting end of said sheet and pressing the same into contact with said driven roll.

2. A machine` of the class described comprising a rotary copy-sheet carrying drum having a `longitudinal surface recess `over which an end of the sheet projects and stripping mechanism comprising a driven stripper roll disposed beyond the drum periphery, a movable sheet deector roll', and articulate cam operated means for moving said deilector roll into said recess to engageV the inner surface of the projecting end of said sheet and thence outwardly to press the sheet against said driven roll to effect the stripping of the sheet from `the drum during the rotation thereof 3. A machine of theclass described comprising a frame, a copy-sheet carrying drum rotatably supported thereby; said drum having a longitudinal recessin the periphery thereof over which ends of the copy sheets are adapted toA project, a cam operable with said drum, and stripper mechanism comprising a driven stripper roll, a deector roll, an articulated swingable structure carried by said frame and operatively controlled by said cam and upon which said deflector roll is mounted for moving the latter into and outof said recess for deflectin'g the projectingr end `of thecopy sheet away from said drum, and means on the framer for guiding said deflector roll and sheet end into contact with said stripper roll for stripping the sheetv from the drum. l

4. A machine of the class described comprising y a rotary copy-sheet carrying drum havinga lon? gitudinal recess in .the periphery thereof over which the copy `sheets project, andkstripping mechanism comprising a driven roll disposed beyond the periphery of said drum, a sheet deflector roll, an'articulate swingablestructure supporting said deflecto'r roll, a cam operable with said drum for effecting the actuation of said lstructure'in directions for moving said deflector p roll into and from said recess to engage the projecting end of the copy sheet and move the same outwardly of 'said drum periphery, and means for guiding said deflector roll during ltheout- Ward movement thereof for moving said sheet endv into contact with said driven roll for stripping the sheet from the drum as the latter rotates.

5. In a duplicating machine the combination of a rotary copy sheet carrying drum having a longitudinal surface recess, means for effecting the disposition of a copy sheet on the drum 4with one end of the sheet projecting over the longitudinal recess in the surface thereof, means for. effecting the disposition of acopy sheet on the drum with one end projecting over said recess, and means for stripping the sheet from the drum comprising a driven stripper roll disposed beyond the periphery of the drum and a relatively shiftable coacting sheet deector roll arranged for engaging said projecting end of said sheet and pressing the same into contact with said' driven roll. DEAN H. WHITEHEAD.