US2051376A

US2051376A - Duplicating mechanism

Info

Publication number: US2051376A
Application number: US695920A
Authority: US
Inventors: John W Hernlund; Cecil C Mccain; Marchev Alfred
Original assignee: Ditto Inc
Current assignee: Ditto Inc
Priority date: 1933-10-30
Filing date: 1933-10-30
Publication date: 1936-08-18
Anticipated expiration: 1953-08-18

Description

Aug. 18, 1936. 1. w. HERNLUND ET -A|.

DUPLICATING MECHANISM Filed oct. so, 1935 9 Sheets-Sheet 1 Auge 18, 1936- J. w. HERNLUND Er AL 2,051,376

DUPLICATING MECHANISM 9 sheets-sheet 2' Filed Oct. 50, 1935 Aug. 18, 1936.

J. W. HERNLUND ET AL DUPLICATING MECHANISM 9 sheets-sheet s' Filed Oct. 50, 1933 im la Aug./18, 1936 x. w. HERNLUND ET'AL 2,051,376

DUPLI CATING MECHANI SM Aug. 18, 1936.

J. w. HERNLUND ET A1.

DUPLICATING MECHANI S M Filed Oct. 30, 1933 9 Sheets-Sheet 5 9 sheets-sheet 6 Filed oct. so, 1953y Aug. 18, 19436. J. w. HERNLUND E12/xl.

DUPLICATING MECHANISM F'iled Oct. 30, 1933 Zarza.

1935 9 Sheets-Sheet 8 J. W. HERNLUND ET AL.

DUPLICATING MEGHANISM Filed Oct. 30,

Aug. 18, 1936.

Aug. 18, 1936. 1. W. HERNLUND ET AL 2,051,376

DUPLICATING MECHANISM Filed Oct. 30, 1933 9 Sheets-Sheet 9 Patented Aug. 18, 1936 DUPLICATING PATENT vOFI-ica MECHANISM John W. Hernlund, La Grange, Cecil C. Mc0an, Glen Ellyn, and Alfred Marchev, La Grange,

Ill., assignors to Ditto, ration of West Virginia Incorporated, a corpo- Application October 30, 1933, Serial No. 695,920

Claims. v(Cl. 101-132) This inventionl relates to duplicating machines of the rotary type and more especially, though not exclusively as to all of its features, to duplieating machines employing a master sheet presenting in reverse, or negative, condition thereon the transfer-ink impression of which copies are to be made on sheets of paper fed to the machine, produced, as for example, by typing the sheet which is to form the master sheet, against a transfer-ink carbon sheet applied to the back thereof, the sheets from which the duplicates are to be made being moistened, preliminary to the making of the impressions thereon, with a solvent of the ink from which the im- Ipression on the master sheet is made.

Certain of the objects of the invention are to provide for the more rapid printing of the sheets; to provide for the automatic clamping of the master sheet to -the impression cylinder of the machine as the first step in the operation of conditioning the machine for the making of copies of the impression; to provide for the release of the master sheet from the impression cylinder, under the control of the operator. by the continuation of the operation of the driving means in the same direction as when producing the copies; to provide for the accurate alignment with the master sheet of the sheets to be printed and particularly useful where ruleline registration is necessary; to provide against 'the rotation of the impression cylinder in case of failure to present a sheet at the proper time to the means for feeding the'sheets into cooperative relationship with the impression cylinder; and other objects as will be manifest from the following description. v

Referring to the accompanying drawings:

Figure 1 is a view in side elevation of a machine embodying our invention.v

Figure 2 is a plan view of the machine.

Figure 3 is a section taken at the line 3-3 on Fig. 2 and viewed in the direction of the arrows. l

Figure 4 is an enlarged sectional fragmentary view showing that portion of the impression cylinder which is equipped with clamping means for the master sheet showing these clamping means in open position and illustrating the master sheet as fed into a position to be engaged by these clamping means. Figure 5 is a similar view of the parts shown in Fig. 4 illustrating the clamping of the master sheet in the movement' of the cylinder out of the position shown in' Fig. 4.

Figure 6 is a similar view'of the parts shown in Figs. 4 and 5 showing the machine upon the completion of one revolution of the cylinder from the position shown in Fig. 4 and illustrating the position to which the sheet upon which theimpression is to be made is fed upon the cylinder 5 reaching this position.

Figure 7 is a broken plan sectional view taken at the line 'l on Fig. 8 and viewed in the direction of the arrow.

Figure 8 is a section taken at the line 8 8 10 on Fig. 3 and viewed in the direction of the arrows.

Figure 9 is a plan sectional view taken at the irregular line 9-9 on Fig. 8 and viewed in the direction of the arrows. 15

Figure 10 is a broken fragmentary sectional view taken at the irregular line lll-I0 on Fig. 8 and viewed in the direction of the arrows.

Figure 11 is a section taken at the line Il-H on Fig. 1 and viewed in the direction of the arrows.

Figure 12 is a section taken at the line I2-I2 on Fig. 11 and viewed in the direction of the arrows.

Figure 13 is a section taken at the line |3-I3 on Fig. 11 and viewed in the direction of the arrows.

Figure 14 is a broken section taken at the irregular line I-M on Fig. l1 and viewed in the direction of the arrows.

Figure l5 is an enlarged fragmentary section taken at the line I5l5 on Fig. 14 and viewed in the direction of the arrows.

Figure 16 is a fragmentary section taken at the irregular line. lB-IB on Fig. 11 and viewed in the direction of the arrows.

Figure 17 is an enlarged fragmentary section taken at the irregular line II-I'l on Fig. 2 and viewed in the direction of the arrows this view illustrating the positions occupied by the parts of the machine when the machine is at' rest following one complete cycle of operation.

Figure 18 is a similar view, showing the impression drum at the beginning of its cycle of revolution showing the position of the cylinder-driving means provided a sheet has been introduced into the machine into a position for feeding.

Figure 19 is a view like Fig. 17 illustrating a position of the parts of the cylinder and its driving means and the control means therefor in the event that no sheet has been introduced into the sheet-feeding means.

Figure 20 is a fragmentary section taken at the line 20-20 on Fig. 11 and viewed .in the direction of. the arrows.

tion of the arrows and illustrating certain con-. l trolling means for the feed rolls.

Figure 22 is a similar view of the same part showing another position occupied thereby.

Figure 23 is a fragmentary plan section taken at the line 23 on Fig. 19 and viewed in the direction of the arrow.

Figure 24 is a fragmentary section taken at the line 24--24 on Fig. 23 and viewed in the direction of the arrows.

Figure 25 is a perspective view of a bed plate of the machine over which the sheets are fed to the duplicating cylinder.

Figure 26 is a perspective view of a margin bar forming a part of the machine.

Figure 27 is a perspective view of a feeler device constituting a part of the mechanism controlling the operation of the machine in the event of failure of delivery of a sheet to the feed means; and

Figure 28, a perspective view of the upper one of the feed rolls and the mounting therefor.

Referring to the particular illustrated embodiment of the invention, it comprises a frame presenting side plates 38 and 3| rigidly secured together in spaced apart relation by shouldered

tie rods

32, 33 and 34.

At one end of the frame and extending into the space between the side plates is a bed plate structure shown as comprising two' sections 35 and 36 (Fig. 3) and forming a support along which the master sheet and the copy sheets are fed to the mechanisms hereinafter described. At the opposite end of the frame and extending into the space referred to is an inclined delivery chute 31 shown as supported on the tie rod 34 in a position-below the bed plate structure and to which the master sheet, after the printing operations are completed, and the printed copy sheets, are

delivered.

The impression cylinder represented at 38 (Fig.

3) and located adjacent the inner end of the bed plate structure 35-36v and directly above the receiving end of the chute 31 is shown as comprising end disks 39 and 48 (Fig. 11) and a cylindrical side-wall-forming portion 4| rigidly secured together, the cylinder being rotatably mounted at its ends on

stub shafts

42 and 43 stationarily secured to the frame-sides and forming journals for the cylinder.

The cylinder 38 is adapted to carry a master sheet, such as that represented at 44 (Fig. 3), wrapped about it and presenting on its outer exposed face the transfer-ink. impression in reverse, or negative, condition as above referred to, whereby positive, as distinguished from negative,

impressions are made on the moistened sheetsl successively presented to the `master sheet as hereinafter described.

'I'he means for securing the master sheet 44 to the cylinder 38 comprises a clamp bar 45 located in a recess 46 in the outer face of the cylinder 38 and extending lengthwise thereof and secured at ears 41 ona shaft 48 located in the recess 46 and The clamp y journaled- ,in the'end walls thereof. bar 45 is of slightly less length than the length of the cylinder 38 and is provided with a bevel surface 48 between which and a corresponding bevel surface 58 on the cylinder 38 at the mouth of the slot 46 'the upper edge of the master sheet 44 is clamped, the outer face of the clamp bar 45 being convexed as represented at 5| (Fig. 5).

One end of the shaft 46 (Fig. 13), carries an Varm .52 the outeruend of which is .Pivoted at 53 .face of the end disk 48 of the cylinder 38 and to one end of a. rod 54 slidable in a. stud 55 projecting from the end disk 38 of the cylinder 38, the arm 52 and rod 54 forming a toggle having a coiled compression spring 56 between the toggle joint and the lug 55 which is placed under compression in the movement of the togggle toward dead center position and thus operates to snap the toggle n` passing over dead center whenA actuated as hereinafter described, the pivot 53 being provided at its outer end, beyond the spring 58 and lug 55 with a roller 51 for a purpose hereinafter described.

The -mechanism for rotating the cylinder 38 (Figs. 1, 11 and 19) comprises a crank 58 journalled 'on the side frame 38 and carrying a pinion l 58 which meshes with a gear 68 surrounding, and secured to, a sleeve 6| journalled on the stub shaft 43, the gear 68 being connected, as by screws one of which is represented at 62,' to a cam ring 63 and a clutch ring 64 surrounding the sleeve 6| and shown as formed integrally with a connecting sleeve portion 65, the cam ring 63 being shown as provided about its periphery with three similarly shaped and equidistantly spaced

cams

66, 61 and 68.

The ring 64 which forms a portion of clutch mechanism through the medium of which the cylinder 38 is rotated by the gear 68' is provided in its periphery with three semi-circular equidistantly spaced recesses 69, 10 and 1|, (Figs. 17 and 20), and is surrounded concentrically, but4 in spaced relation thereto, to provide the annular space 12, by a ring 13 stationarily secured to bosses 14 extending inwardly from thev side frame 30, the inner periphery of the ring 13 containing 3 a notch represented at 15.

The clutch mechanism now being described also comprises a roller 16 interposed between the rings 64 and 13 and of such-diameter as shown that when it is entered in the recess 15 it does not obstruct free .rotation of the ring 64, as shown in Figs. 17 and 19, but when entered in any one of the recesses 68-1l it will be held against'y displacement therein by the inner periphery of the ring 13, as shown in Fig. 20 thereby clutching the cylinder 38 to the ring 64 for rotation therewith. The roller 16 (Figs. 11 and 12) is carried on the outer end of a pin 11 secured to one end of a bellcrank lever 18 located in a recess 13 in the outer iulcrumed thereon as represented at 88, the other arm of this bell-crank being connected with one end of a coiled springv 8| the other end of which is connected with the cylinder end, whereby the spring tends to rock the bell-crank 18 at all times in a direction outwardly from the center ofthe cylinder and into the recess 15 when in registration therewith to unclutch the cylinder from the driving means except when restrained by mechanism hereinafter described. 6 Located below the cylinder 38 (Fig. 19)? is a presser roller 82 preferably of rubber provided,

in the particular machine shown, for a double purpose. one of which is to actuate the mastersheet-clamping bar 45 from the open position 6 shown in Fig. 4 to the closed position shown in Figs. 3 and 5 by the rolling of the surface 5| ofthe clamp against this roller in the rotation of the cylinder 38 during the application of the master sheet thereto, as shownvin Fig. 5; and the other 70 of which is to press the impression on the master sheet 44 against the sheets of paper on which the duplicate impressions are to be produced. The `ro1l 82 (Figs. 3, 8, 19) which is located between the bed platestructure. 35. 36 and the chutel'l, 7,,

is journaled at its ends 83in blocks 83al slidably mounted in upwardly extending yokes 84 on the ends of a bar 85 straddled by the sides 86 of a yoke block 81 to which the bar 85 is pivotallyconnected midway between its ends to permit it to rock lengthwise, by a pivot pin 88, the bar 85 being guided at its ends by centering pins 85a secured to the frame-sides 30 and 3| and extending into the yokes 84. The block 87 is mounted at a circular opening 89 therein on an accentric 90 rigidly secured to a shaft 9| `journalled in the frame sides 30' and 3|, the roller 82 thus being adjustable relative to the cylinder 38 to adapt the machine for operating with master sheets and copying sheets of dierent thicknesses, the supporting of the roller 82 on the pivot 88 insuring thel application of uniform pressure by the roll 82 throughout its length.'

For convenience of rotary adjustment of the shaft 9| it is provided with a crank handle 92, the shaft being held in any of the positions of adjustment thereof by means of a gear 93 (Fig. 10) rigid on the shaft 9| and cooperating with a spring pressed plunger 94 mounted on the frame.

Referring now to the mechanism by which the master sheet and thereafter the copy sheets are fed to the cylinder 38 and the transfer-ink solvent applied thereto, this mechanism comprises a pair of parallel rollers 95 and 96 (Flgs.1, 9, and 17) extending crosswise of the machine in front of the cylinder 38, the roller 95, preferably felt covered, extending upwardly into a slot 97 in the bed plate section 36 and journalled at its ends in the frame sides 30 and 3|-, this roller having a pinion 98 connected through the medium of gears 99 and |00 with the gear 60.

The roller 96 which is preferably of rubber ls geared to the roller 95 to rotate at all times therewith, but in the opposite direction, through the medium of intermeshing gears |0| and |02 (Fig. 8) on the

rollers

96 and 95, respectively, the roller 96 being journalled at itsends in a'rock frame represented generally at |03 (Fig. 28)

formed of end members |09 connected together by a longitudinally extending member |05 from which frame a. nger |06, provided for a purpose hereinafter described, forwardly projects. The frame |03 is journaled on the stationary frame of the machine by means 0f stub shafts |01 projecting inwardly from the frame sides into bosses |08 on the frame |03.

The frame |03, which is adapted to be swung with its roller 96 toward and away from the roller 95 as shown in Figs. 17 and 19 to permit of the entry between these rollers of a sheet to be fed thereby, is connected at a part |09 with the lower end of a coiled spring ||0 the other end of which is connected with the frame oi the machine, this spring tending to constantly urge the 4roller 96 toward the roller 95. A roller |i| on the frame |03 cooperates with mechanism hereinafter described and operated by the carnequipped rings 63 to control the position of thel roller 96 relative to the roller 95, it being understood that when the spring ||0 is free to act as shown in Figs. 18 and 19, the roller 96 will be pressed toward the roll 95 with suflicient force to exert feeding action on a sheet interposed between these rollers. y

The mechanism now being described-also comprises means for supplying the liquid solvent for the transfer-ink to the peripheral surface of the roller 96 the means shown for this purpose comprising a reservoir ||2 (Fig. 18) for the solvent mounted on the frame of the machine to extend ing carried to the outer edge of the wick and thence to the roller 96 by capillary attraction.

The wick I5 is held in place by a plate ||6 the pressure of which against the wick, and which pressure thereby determines the amount of feed of solvent to the roller 86, is controlled by a pressure-applying nut ||1 screwed upon the upper end of a stud ||8 rising from the trough.

The trough I3 is preferably pivotally mounted on an axis disposed crosswise of the machine as by the, means of stub shafts ||9 (Fig. 1) at the ends of the trough journalled in stationary lugs |20 beyond the trough-ends. A coil spring |2| pressing upwardly against a lug |22 on the front of the trough serves to exert the desired pressure of the wick ||5 against theroller 96.

The means for controlling the feeding of solvent from the reservoir ||2 to the trough ||3 for maintaining a constant level of the solvent in the trough is of the well known type involving the maintaining of the reservoir ||2 closed to the atmosphere except through a passage the opening and closing of which is controlled by the level of the solvent in the trough ||3. To render smooth and accurate the feed of .the solvent to the trough H3, a supplementary, air, pipe |23 shown as of considerably larger diameter than the pipe ||4 opens into the upper end of the reservoir ||2 and into the trough ||3 substantially at the level of the lower end of thepipe ||4. Thus when the level of the solvent in the trough ||3 drops below the lower ends of they pipes ||4 and |23, atmospheric air enters thev lower end of pipe |23 for passage into the reservoir permitting of the flow of solvent therefrom to the trough to an amount suflicient to reestablish equilibrium, whereupon the flow ceases.

The machine also comprises a margin bar which is movable up and down into and out of the path of movement of sheets manually introduced into the space between the

rollers

95 and 96 when the latter are separated, to insure the proper positioning of the sheet upon the starting of the feed thereof by these rollers.- This margin bar, represented at |24 (Fig. 26), is shown as of sheet material with a rearwardly and upwardly curved edge terminating in a series of stops |25 extending crosswise of the machine and rearwardly beyond the centers of the

rollers

95 and 96, the bar |24 being journalled at its ends on stationary stub shafts |26 to rock ln a vertical plane. A coil spring |21 secured to the bar |24 to the rear of its pivot and to the frame of the machine tends to rock this bar into the raise position shown in Fig. 17.

The stop portions |25`register with openings |28 in the rear edge portion of the bed plate section 36 (Fig. 25) adaptingthese stop portions to extend upwardly through the openings |28 when the margin bar |20 is in the raised position shown in Fig. 17 wherein it is in position-to properly position the sheet inserted into the machine. As shown more particularly in Fig. 26 ythe edge portion of tlne margin bar on whichv the stop portions l25 are provided is cut away at its ends as represented at |294 thereby affording the offset lower surfaces |30 for the purpose hereinafter described.

I tive to the4

bed plate

35, 36. These parts are sor arranged, as shown, that in the movement of the roller 96 toward the roller 95 by the swinging of the frame |03; the margin bar is forced downward against the action of the spring |21 to the lowered position shown in Fig. 18 in which the sheet stops |25 extend out of the path of movement of the sheet between the

rollers

95 and 96 t'o.

movement of the roller 96 away from the roller.

95 the margin bar swings upwardly, under the action of its spring |21- (Fig. 1'7) to project the stop portions |25V into the path of movement of the next sheet inserted into the machine.

The clutching ofthe cylinder 38 to the drive mechanism above described and the actuation of the roller frame |03 and margin bar |24 is effected by means of a lever fulcrumed between its ends to the stationary ring 13,v as indcated at |3|. which is, connected with a coil spring |32 tending to rock this lever clockwise to the position shown in Fig. 18, is adapted to engage the roller on the roller frame |03 and rock the latter clockwise to the position shown in Fig. 17 when this lever is rocked counter-clockwise in this figure.

'I'he rocking of the lever |30 is controlled by the cams on ring 63 into the path of movement of which a roller |33 on the upper end of the lever |30, extends.

TheA lever |30 is provided at its upper end with an angularly disposed finger |34 whichfwhen this lever is .swung to the position shown in Fig. 18, `forces the clutch pin 16 into one of the peripheral recesses in the ring 64 thus establishing driving connection betweenl this drive ring and the cylinder 38 whereby these parts rotate together.

Assuming the machine to be at rest and the various parts to be inthe positions shown in Fig.

i 1'7 in which position the clutch roller 16 extends into the recess 15 in the stationary ring 13 and thus out of cylinder-driving position, and the roller 96 and margin bar |24 are in raised position,

the operator introduces into the space between the

rollers

95 and 96 and against the margin bar I 24, the master sheet 44 to be applied to the cylinder 38 and from which the impressions are to be made on the copy sheets,with the transfer-ink impression, in reverse on the master sheet, facing downwardly. `The crank 58 is then turned clockwise in Fig. 1'7 rotating the cam ring 63 and clutch vring 64 counterclockwise.

In the movement of the receding portion of the cam 66 across the roller |33 the lever |30 is rocked clockwise b y the spring 32 which per- Imits the roller frame |03 to be rocked counterclockwise by the spring |0 thus moving the roller 96 downward against the master sheet, to establish drive connection between the rollers 95 andfed by the

rollers

95 and 96, which move atthe same surface speed as the cylinder 38, to" a posi- 'I'he lower end of the lever |30A tion in which its rear edge portion extends into the recess 46 in the cylinder between the surface 41l andA the clamp bar 45 which in this operation of the machine is open (Fig. 4), the

rollers

95 and 96 continuing to feed the sheet at theY` same speed as the surface speed of the cylinder 38 so fthat when the clamp bar 45 moves against the roller 82,thus causing the bar 45 to spring to clamping position (Fig. 5) the master sheet becomes clamped to the cylinder. It may be here stated that in the particular construction shown the crank is so geared to the drive ring 64 that it requires three revolutions of the crank for one complete revolutionof the cylinder 38.

The operator continues to rotate the crank to wind the master sheet about. the cylinder and when the cam 66 again engages the roller |33, namely, toward the end of the complete rotation of the cylinder which raises the roller 96 and the margin bar |24 (Figl 1,7), he inserts a sheet'20 tobe printed and represented at |35 beneath the roller 96 and against the stop portions |25`of the margin bar. As the roller |33 rides down the cam 66 in the continued rotation of the crank the lever |30 rocks clockwise to permit the roller 25 the cylinder, that the rear edge of the sheet |35 35i becomes registered with the clamped edge of the master sheet 44 as represented in Fig. 6, so that l the impression produced on the copy sheet, as .Y

hereinafter described, will occupy the same position thereon as it does on the master sheet. 'Ihese sheets continue to move at the same speed, the sheet |35 atwise opposing the underside of themaster sheet and entering between the master sheet and the roller 82 as shown in Fig. 3 and the surface coming in contact with the master sheet having first been moistened by the moistening means above described insures thereceiving of an impression from the master. sheet, the printed sheet, in the continued rotation of the cylinder dropping into the chute 31 with its impression surface uppermost. The cycle of operations just described is repeated for each successiveA sheet to be printed from the mastersheet.

The machine also comprises means Iwhereby the master sheet may be removed from the cylinder by a semi-automatic operation and without requiring reversal of the cylinder. The means shown for this purpose comprise a plunger rody |36 provided at its lower end with a block |31; slidable vertically in a channel |38 in a guide member |39 secured to the frame side 3| (Figs. 3, 11, 14, 15). The rod |36 extends upwardly above the frame side to expose it for operation and is yieldingly held in the raised position shown in these figures by a coil spring |40 interposed between a stop |4| on the rod |36 and a washer |42 surrounding the rod and bearing against the guide member 39. A cross pin |43 in the guide member and extending through a vertically elongated slot |44 in the block |31 limits the vertical movement of this block in both directions.

. 'I'heblock l|31 is provided with an upward extension |45 having a terminal portion |46 which extends beyond the face of the block. as shown,

in Fig. 15 and is of triangular shape (Fig. 14)

rod |36 downwardly the portion |41 of the block |31 extends into the path of movement of the roller 51 for moving the clamp-bar toggle to the open position shown in Fig. 4, and thereby releasing the master sheet 44 which, in the continued rotation of the cylinder, discharges into the chute 31.

A roller equipped pin |48 secured to the frame side A3| and which is out of the path of the roller 51 when the clamp 45 is in clamping position and the cylinder is rotating, is so positioned that it will be engaged by the roller 51 assuming the clamp has been opened (Fig. 4) and the cylinder 38 is rotated in a reverse direction by accident or otherwise, thus automatically actuating the clamp mechanism to closed position in which the clamp may move against the roller 83 without gouging it and which would otherwise be the case were this clamp bar to move in open position (Fig. 4) against this roller in the rotation of the cylinder clockwise.

The machine also comprises means, referred to herein as feeler means, which operate automatically to control the driving of the cylinder 38, whereby should the operator fail to insert a sheet into the machine between the

feed rollers

95 and 96 at the proper time, the drive means will be disconnected from the cylinder and the latter will remain stationary, in the continued operation of the drive means, until the operator resumes the insertion of the sheets into the machine, a sheet, however, being insertable upon the succeeding turn of the crank thereby eliminating the necessity of making three turns of the crank, these means also serving to prevent the insertion of sheets into the machine while the roller 96 and margin bar |24 are in lowered position.

The outer ends of the members |50 and |5I overlie the surfaces |30 of the margin bar |24 and the parts are so arranged as shown that when the margin bar is moved to lowered position (Fig. i9) the frame |49 may swing therewith, under the action of the spring |58, to the raised position shown in this figure if no sheet has been inserted into the machine, in which position the lug |53 extends upwardly through a slot 20| in a stationary plate 200 located directly above, and spaced from, the

bed plate structure

35, 36, but when the margin bar |24 is swung upwardly to the is so shaped and positioned on the cylinder that position shown in Fig. 17 it rocks the frame |49 to the lowered position shown in this figure.

In the raised position of the frame |49 (Fig. 19) the notch |54 extends into the path of movement of a stud |59 on the lower end of the lever |30 and shown as of triangular shape in cross section, and prevents the swinging of this lever to a position in which the nger |34 thereon would force the clutch'roller 16 out of the recess 15 in the stationary ring 13 in which position of the clutch roller` the cylinder is unclutched from the drive means.

It will thus be understood that so long as sheets are inserted in succession into the machine at the proper timed intervals during the operation of the machine, three crank turns only would be necessary for each printed copy because each succeedlng sheet would be so timed as to be between the lug |53 and the upper plate 200 which would prevent the frame |49 from rocking into a posi- 20 tion to obstruct free movement of the lever 30. Should the operator fail to insert a sheet into the machine at the proper time the frame |49 swings upwardly effecting the stopping of the cylinder 38 as above stated.l However, the cams on the ring 63 continue to act in succession against the lever 30 but without shifting the clutch roller 16 to cylinder-driving position because there is no sheet to obstruct the upward movement of the feeler frame.

When the proper manual feed of the sheets to the machine is resumed, the lever |30 is free to force the clutch roller 16 into cylinder-driving position when actuated. by the spring |32 on lower end of same, as the roller |33 recedes from the adjacent one of the cams on ring 63, as shown on Fig. 18.

The provision of the three

cams

66, 61 and 68 is desirable as thereby it is unnecessary, in starting the machine into operation, to rotate the crank handle more than one revolution after the operator resumesthe inserting of the sheets intothe machine. f

It is desirable that the roller 96 remain in contact with the top surface of each sheet inserted therein throughout its travel in order that the solvent may be uniformly transferred over its entire top surface. To accomplish this means are provided whereby the roller |33, following the operation of Ithe lever 30 which conditions the clutch roller 16 for thebeginning of the cycle oi' operation of the cylinder 38, is automatically shifted out of the path of the two succeeding cams on the ring 63 represented by 61 and 68 (Fig. 19) and thereafter is automatically returned to camengaging position. These means involve the mounting of the roller 33 on a pin |60 slidable on the lever |30 crosswise thereof (Figs. 21, 22) and normally pressed by a coil spring |6| into a position in which it is out of the path of movement of the cams 61, 68 (Fig. 2l), the rollerequipped pin |60 cooperating at its outer end |62 with a stationary arcuate cam |63 secured to the end member 40 of the cylinder 38. The cam |63 the pin |60 will be in engagement with the cam |63, causing the roller |33 to occupy the position shown in Fig. 22, at the beginning of the cycle of operation of the cylinder 38, the spring |6| forc-A ing the pin |60 to the position shown in Fig. 21 70 to clear the next two succeeding cams on the ring 63.

The journal 42 for the cylinder 38 which is rotatable in the frame side 3| and is slidable endwise from the cylinder, is held in place by a screw |64 screwing into the frame side and bearing at its head |65 against a flange |66 on the journal, the flange, to permit of quick release of the journal, containing an arcuate peripheral recess |61 which, when the screw |64 is loosened and the journal rotated to cause this recess to register with the screw-head, permits of the withdrawal of the journal.

While we have illustrated and described a particular embodiment of our invention we do not wish to4 be understood as intending to limit it thereto as the same may be variously modified and altered and the invention embodied in other forms of structure without departing from the spirit of the invention. i Y

What we claim as new, and desire to secure by Letters Patent, is:

1. In a machine of the character described, a rotatable impression cylinder, means for driving said cylinder, means for feeding sheets to said cylinder, means operating in timed relation to 'said cylinder for rendering said sheet-feeding means functionally inoperative, stop means movable into and out of a position for preventing the entry of sheets into said sheet-feeding means and means whereby said stop means extend in sheet-obstructing position in the operative condition 4of said sheet-feeding means.

2. In a machine of the character described, -a rotatable impression cylinder, means for driving said cylinder, means for feeding sheets'to said cylinder comprising cooperating rollers to` receive the sheet, said rollers being separable to permit the sheets to be introduced between them, means operating in timed relation to said cylinder for separating said rollers, stop means movable into and out of a position for preventing the entry of sheets into said sheet-feeding means, and means whereby said stop means extend in sheet-obstructing position in the operative condition of said sheet-feeding means.

3. In a machine of the character described, a rotatable impression cylinder drive means, a releasable clutch connecting said cylinder with said drive means and releasable at one point only in the rotationof said cylinder through one printing cycle, means urging said clutch to released` position, means for feeding sheets to said cylinder operating in timed relation to said cylinder, and means controlled by the sheets delivered to the machine operating, upon the regular delivery of the sheets to the machine, to maintain said clutch in driving condition against the resistance of said second-named means.

4. In a machine of the character described, a rotatable impression cylinder, drive means, a releasable clutch connecting said cylinder with said drive means and releasable at one point only in the rotation of said cylinder through one printing cycle, means urging said clutch to released position, means for feeding sheets to said cylinder operating in timed relation to said cylinder, a rock lever operable to maintain said clutch in driving condition against the resistance of said second-named means, and a device controlled by the delivery of sheets to the machine for controlling the operation of said lever operating to render said lever inoperative to actuate said clutch against the resistance of said second-named means upon failure of regular delivery of the sheets to the'machine.

5. In a machine of the character described, a rotatable impression cylinder, drive means, a releasable clutch connecting said cylinder with said drive means and comprising a stationary ring containing a recess on its inner periphery, a rotatable ring driven by said drive means an'd located within said first-named ring and having a recess in its outer periphery and a clutch element on said cylinder located between said rings said element when positioned in said firstnamed recess being out of driving engagement with said rotatable ring and when positioned in' a rotatable impression cylinder, drive means, a 20.

. releasable clutch connecting said cylinder with said drive means and releasable at one point only in the rotation of said cylinder through one printing cycle, means for feeding sheets to said cylinder operating in timed relation to said cylinder, a series of camsdriven by said drive means and means controlled by said cams and by the sheets delivered to the machine and controlling said clutch whereby said cylinder becomes disconnected from said drive means upon failure of delivery of a sheet to the machine- 7. In a machine of the character described, a rotatable impression cylinder, drive means, a releasable clutch connecting said cylinder vwith said drive means and releasable at one point' trolling said clutch whereby said cylinder becomes disconnected from said drive means upon failure of delivery of a sheet to the machine, and means `actuated by said cylinder, in its movement responsive to the actionof one of said cams for rendering succeeding ones of the cams inoperative to separate said elements.

8. In a machine of the character described. a rotary impression cylinder, means for driving said cylinder, a roller between which and said cylinder the sheetsto be printed are passed, a

clamp device for clamping a sheet to said cylinder.

and extending, when in open condition, beyond the periphery of said cylinder and engageable with said roller in the rotation of said cylinder in one direction for moving said device to clamping position, means operative to move said clamp device to open position, and means operating automatically to move said clamp device to clamping position before reaching said roller upon reverse rotation of said cylinder.

9. In a machine of the character described, a rotatable cylinder, drive means therefor, a master sheet receiving and gripping mechanism on said cylinder, a copy sheet feeding mechanism, a copy sheet moistening mechanism, a table for said sheets, and manual control means Ifor said rst named mechanism operable to cause.

release of the old master sheet after passing said sheet feeding mechanism, said first named mechanism being operable to receive and grip a new master sheet fed to it from said sheet feeding means.

10. A machine for reproducing copies from a master sheet having a record formed thereon in reverse, comprising in combination, a rotatable cylinder, gripping mechanism on said cylinder for seizing and holding one edge of a master sheet thereon, a moistening device adapted to moisten one surface of the copy sheets before they are pressed against the master sheet on said cylinder, means for pressing the moistened copy sheets against the master sheet during a portion of the revolution of the cylinder, a sheet support adjacent said cylinder for copy sheets and new master sheets, means to release the gripping mechanism on a previously gripped master after the gripping mechanism passes the copy sheet engaging position, means for feeding the new master from said support, and means closing the gripping mechanism on said new master after it-leaves the support, said releasing and closing means being normally inoperative, and manually controlled means for rendering them operative when it is desired to change the master.

11. A machine for reproducing copies from a master sheet having a record formed thereon in reverse, comprising in combination, a rotatable cylinder, gripping mechanism on said cylinder for seizing and holding one edge of a master sheet thereon, a moistening device adapted to moisten one surface of the copy sheets before they are pressed against the master sheet on said cylinder, means for pressing the moistened copy sheets against the master sheet during a portion of the revolution of the cylinder, a sheet support adjacent said cylinder for copy sheets and new master sheets, means to release the gripping mechanism on a previously gripped master after the gripping mechanism passes the copy sheet engaging position, means for feeding the new master from said support, and means including said pressing means for closing the gripping mechanism on said new master after it leaves the support, said releasing and closing means being normally inoperative, and manually controlled means for rendering them operative when itis desired to change the master.

12. In a machine of the character described, a

, rotatable cylinder, drive means therefor, a master sheet receiving and gripping mechanism on said cylinder, a copy sheet feeding mechanism, a copy sheet moistening mechanism, a table for said sheets, and manual control means for said rst named mechanism operable to cause release of the old master sheet after passing said sheet feeding mechanism, said first named mechanism being operable to receive and grip a new master sheet fed to it from said sheet feeding means, a pressure roller cooperating with said gripping mechanism to close the gripping mechanism on the new master sheet, and thereafter serving to press the copy sheets against the new master sheet.

13. A machine for reproducing copies from a formed thereon in master sheet having a record reverse, comprising in combination, a rotatable cylinder, gripping mechanism on said cylinder for seizing and holding one edge of a master sheet thereon, a moistening device adapted to moisten one surface of the copy sheets before they are pressed against the, master sheet on said cylinder, means for pressing the moistened copy sheets against the master sheet during a portion of the revolution of the cylinder, a sheet support adjacent said cylinder for copy sheets and new master sheets, means to release the gripping mechanism on a previously gripped master after the gripping mechanism passes the copy sheet engaging position, means for feeding the new master from said support, and means closing the gripping mechanism on said new master after it leaves the support, said releasing and closing means being normally inoperative, and manually controlled means for rendering them operative when it is desired to change the master, said device having means to lock the gripping mechanism in closed position upon reverse rotation of the cylinder.

14. In a machine of the character described, a frame, an impression cylinder rotatably mounted therein, a platen roller, master sheet clamping i means on said cylinder, a guide table for guiding copy sheets fed to said cylinder between the platen roller and said cylinder, drive means for rotating said cylinder, a manually operable lever adapted when actuated to cause opening of said clamping means to release the master sheet at a predetermined point in the rotation of said cylinder, a pair of combined sheet feeding and moistening rollers cooperating with said table and driven by said drive means, means to stop said cylinder with the clamping means registered with said table whereby all copy sheets fed from said table properly register with a master held by said clamping means, a lost motion connection between said drive means and said cylinder, and a direct drive connection between said drive means and said moistening and feeding rollers whereby to advance a sheet from said rollers to said cylinder before starting the cylinder.V

15. In a machine of the character described, a

rotatable cylinder, drive means therefor, a master sheet receiving and gripping mechanism on said cylinder, a copy sheet feeding mechanism, a copy sheet moistening mechanism, a table for said sheets, and manual control means for said first named mechanism operable to cause release of the old master sheet after passing said sheet feeding mechanism, said last named means cornprising a lever on said cylinder connected to said gripping mechanism to open and close the same, spring means for holding said lever in gripping mechanism opening or closing position, a movable stop member on the machine, a stop engaging member on said lever, and a manually operable member for moving said stop member into the path of the stop engaging member on the lever.

JOI-1N W. HERNLUND.

CECIL C. McCAIN.

ALFRED MARCHEV.