US2162812A - Inker throw-off - Google Patents

Description

June 20, 1939. c". w. HARRQLD ET AL I I 2,152,812

INK-ER THROW-OFF INVENTOR.

llzarlfs' WHarrold. BY Alfred SiuI/JYarrz'a. v I I v 1 ATTORNEY.

J1me 1939- c. w. HARROLD ET AL ,8

INKER THROW-OFF Filed Feb. 15, 1937 4 Sheets-Sheet 2 "it E??? 'UHIIHIIIHI ll tlllllglllll MIEHIIHIF:

IN V ENTORS. Charla? WHarroZd.

BY Al frcd $22122 Harris.

M my

ATTORNEYS.

June 20, 1939.

' c. w. HARROLD ET AL INKER THROW-OFF Filed Feb. 15, 1957 4 Sheets-Sheet 3 u m W W A Patented June 2Q, :1939

PATENT OFFICE INKER THROW-OFF Charles W. Harrold, University Heights, and Al fred Stull Harris, Cleveland Heights, hio, as-

signors to Harris- Seybold-Potter Company,

Cleveland, Ohio, a. corporation of Delaware Application February 15, 1937,- Serial vNo. IZSJW 18 Claims. (61. 101-351) This invention relates to improvements in inker throw-off mechanism, that is to say mechanism for interrupting the flow of ink to the form of a press when the printing operation is interrupted while the press continues to run. As is well known in the art this tripping of the impression may be accomplished manually by the operator or automatically upon the occurrence of some contingency, such for instance as the failure of a sheet feeder to properly present a sheet to the press.

In inkers of the type described in United States Letters Patent No. 1,980,639, granted to A. Schlesinger, sets of rollers are employed for preliminarily working the ink before the latter is passed on to the other rollers of the inker and finally applied to the form. In such inkers there may be a plurality of sets of such ink working or mixing rollers, and each set may be arranged to work the ink for several cycles of the printing press before passing it along to the other rollers of the inker.

Under these conditions a sufficient charge of ink is carried by each set of mixing rollers to supply the form with ink for several impressions The diflerent sets of mixing rollers come into operative relation, one set at a time, with the form inking rollers. There is then available in the inker beyond the ductor roller a supply of ink equal to the supply being currently used multiplied by the number of sets of mixing rollers. inkwere permitted to be distributed to the form rollers while the press was ofi impression, obviously the form rollers would be greatly over-supplied with ink, and upon the resumption of printing a number of sheets would receive too great a quantity of ink. It is therefore desirable to provide means for automatically cutting oil the flow of ink before it reaches the form rollers. Incidentally it is desirable also when the press trips to cut off the supply of ink to the mixing rollers before opportunity is afforded for either set of those rollers to collect more than one charge of:

ink.

the provision of means for avoiding the'overinking of sheets passing through the press upon the resumption of printing following a tripping of the press, where the inker is of the type speci il'ed.

Another object isthe provision of means for so interrupting the transfer of ink from the mixing rollers to the form inking rollers at times when If all of this One of the objectsof the invention-therefore is I stantially as the transfer of ink to the form lnk-. ing rollers is interrupted.

, Still another object is the provision of manually operated means for restoring normal contact between such ink mixing rollers and the remaining 5 rollers of the inker while the press is still ofi im-v pression, so that all rollers of the inker may be Fig. l is a diagrammatic side elevatlonal view 15 v of an ofi'set press with our inker in operative position thereuon, the view being taken partly in section directly behind the forward side of the frame of the machine.

Fig. 2 is a similar view showing a modification. 20

Fig. 3 is a diagrammatic view on a larger scale showing a portion of the mechanism of Fig. i, the frame of the machine being removed and the mixing rollers being shifted to their other operative position. 25

Fig. 4 is an end elevational view, partly broken away, showing the driving mechanism for operation of the cams controlling the movements of the ductor roller and the shifting of the mixing rollers from one position to the other. to

Figs. 5 and 6 are diagrammatic side elevational views of a modification of the invention in which the ink mixing rollers may be held entirely out of contact with the other rollers oi the inker, Fig. 5 showing such out-of contact position and 35 Fig. 6 showing one of the operative positions, the forward side of the frame being removed in eachv case.

Fig. 7 is a side elevational view on a larger scale of a portion of the inker of Fig. l, the form rollers to being raised out of contact with the plate cylin-. derof the press.

Fig. 8 is a detail view on alarger scale showin certain driving mechanism employed in connection with the invention, as illustrated in Fig. 1, i5 andshowlng a transfer roller in operative posi-- tion for conveying ink from therreceiving roller to the ink drum.

i Fig. 9 is a fragmental view showing the transso fer roller of Fig. 8 in position to interrupt the flow of ink from the receiving roller to the ink Fig. 10 is a plan view of certain connections in the throw-0d; control, r

II, the cylindrical printing surface of the latter being hereinafter referred to as the form of the,

press.

For the purposes of the present application the cylinders I and I2 may be understood to be mounted on fixed axes, The blanket cylinder l I however is mounted to turn around the axis of a shaft l4 which is supported eccentrically in cylindrical blocks l5 mounted to have a slight turning movement in the frame of the press. One of these blocks I 5 carries a lug l6 to which is pivoted a link or rod l1 forming a part of the trip mechanism of the press. Movement in the direction of the arrow in Fig. 1 communicated to 'thelink l1 by the trip mechanism is transmitted also to the corresponding block at the other end of shaft I4, causing the axis of the shaft to move diagonally downward toward the left, shifting the cylinder from printing position indicated by circle A in Fig. 1 to off position indicated by circle B in that figure. Trip mechanism of this character is more fully illustrated and describedin'application for United States Letters Patent Serial No. 156,794, filed December 10, 1934, by Charles W. Harrold and Clyde G.-Horton.

In that-form of the invention illustrated in Figs. 1, 3, 4 and '7 to 11 inclusive the inker comprises a suitable frame, indicated at l8, in which thereis supported anvink fountain IS. A fountain roller 2|- supported on a shaft is so arranged as to take ink from fountain l8. At regular intervals a ductor roller 22 moves into surface contact with fountain roller 2| to receive a charge of ink therefrom, after which roller 22 returns to ink delivering position shown in Figs. 1 and 3. For this purpose the roller 22 is journaled in a 'pair of arms 23 which are mounted to swing with an oscillatable shaft 24 journaled in the frame. At one end of this shaft there is keyed an arm 25 having on its outer extremity a follower 26 which runs upon a cam21 mounted upon shaft 20. This cam has two high spots. Consequently roller 22 "will be lifted into contact with roller 2| twice v ink-delivering position of the roller may be adjusted with nicety.

r Somewhat below the delivery position of roller 22 there is a shaft 33 journaled in the side .mem-

bers of the inker frame. Upon this shaft.be

tween the side members of the inker frame there is fixed a frame comprising two end plates 34 in which are rotatably mounted four shafts 35, '35, 36 and 36' These shafts carry ink working or mixing rollers 31, 31', 38 and 38'. The rollers 31 and 31' form one set and the rollers 38 and 38' form another set. Below shaft 33 there is a shaft--- 38 upon which is 'moimted an ink receiving roller 48. The frame which carries the mixing rollers has two operative positions, one shown in Fig.- 1 where the roller 31 contacts with the ductor.

roller 22 when the latter is in its ink delivering position, and where the roller 38' contacts with the ihk receiving roller 48. The other position is shown in Fig. 3, where the roller 38 contacts the ductor roller and the roller 31' contacts the ink. receiving roller. With these rollers in the first position the set '31, 31' is receiving ink from the ductor roller and mixing it, the other set in the meantime further mixing the ink upon the surfaces of its rollers and delivering it to the receiving roller 48. In the other operative position these functions are interchanged, that is the set 38, 38' is receiving ink from the ductor roller while the set 31. 31' is delivering ink to the receiving roller. In order that the frame for the mixing rollers may be shifted periodically from one operative position to the other, an arm 4| is arranged to engage the form on cylinder l2. The

form rollers contact storage rollers 49 and 50, and the latter rollers receive ink through intermediate rollers 5| and 52 from an ink drum 53. Ink is fed to the drum 53 from a transfer roller 54 which is also in contact normally with receivingroller 48.

Preferably the form rollers and associated parts are so mounted as to be capable ,of being raised out of contact ,with the cylinder l2 conveniently and-quickly. To this end pairs of arms 55 and 56 are rotatably mounted-upon the shaft 51 ofdrum 53. All of the rollers 45, 46, 48 and 5| are journaled in the arms 55 orprojections thereof, and similarly the rollers 41, 48, 50 and 52 are carried by the arms 56. When the arms 55 and 56 are swung upwardly and outwardly the rollers 45, 46, 41 and 48 are caused to clear the cylinder i2, as shown in Fig. 7.

The means for accomplishing this raising of the form rollers comprises on each side of the press a pair of toggle links 58 pivoted-at their outer ends to the arms 55 and 56 and at their inner ends to an upright link 58, the latter being connected pivotally to a lever 68 which is pivotally mounted at 6| on the frame of the inker.' From the opposite end of this lever a rod 62 extends downwardly to a lip 63 which is attached to the block l5. When the rod 52 is pulled downwardly upon the tripping of the press the link'58 of course moves upwardly, spreading the toggle links 58 and raising the arms 55 and 56. The upward movement of the link 58 is limited by a stop 64 onthe frame. Y

In order to break connection between the receiving roller 48 and the drum 53 for the purpose of interrupting the transfer of ink from the upper part of the'inker to the form rollers, the

its ends in brackets 65 which are mounted to.

transfer roller 54 ismounted to-swing away from 65' oscillate upon sleeves 85a, carried on studs 86,

fixed in the frame These brackets are provided with slots 61 which receive the studs, and set screws 68 by means of which the engagement of the roller 54 with the drum 53 may be adjusted. An extension 88 on each of the brackets 65 is pivo'tally connected with a sleeve 18 surrounding an eyebolt 1|, each" of these sleeves being -ad- 31' and 38'. Rollers 31 and 38-however are driven justable lengthwise of its bolt by means of nuts 12 and 13. The bolts 1| are pivotally connected with short cranks 14 that are keyed toa rock shaft 15 journaled in the frame. Shaft 15 carries another crank-16 (Fig. 1) connected with a rod 11 by means of which the shaft is oscillated. When'rod 11 is pulled to the left the extensions 89 on brackets 65 are raised, as indicated in Fig. 9, and the roller 54 is swung away from contact with roller 48." When the rod 11 is moved again to the right the-parts takethe positions indicated in Fig. 8, which is the-normal operating condition of the inker. 'At this time the pivotal connections between the shaft 15 and the extension 58 come into line so as to more readily hold the roller 54 in its operative position.

As shown in Fig. 10 the opposite end of rod 11 is turned at a right angle and pivotally con- I nected with a crank 18 that is rotatably mounted upon a stud 19 which is threaded into the frame.

The crank 18 is made integral with an arm. 88

hub of which is rotatably mounted on stud 19.

When the bar 8| is in the position illustrated in.Figs. 10 and '11 the two cranks 81 and 18 are locked together by the intermediacy of pin 86 engaging slot' 85 in bar 8|. When bar 8| is 5 pulled to the rear far enough to disengage slot 85 :from pin 85 the two cranks 18 and 81 are free to move relatively to each other.

As previously stated, when the press is tripp'e the roller 54 is swung away from engagement 4 with roller 48 by the movement of rod 11 toward the left. In order to accomplish this the crank 81 must be drawn downwardly. In the form'of the invention illustrated in Fig. 1 a short rod 88, pivotally connected-with crank .81, is confnected to a-lever 89 which is keyed to the outer end of a short shaft 9| extending through one of the inker frames I8. Keyed to'the inner end I is adapted to engage the upper side of the noddle .pin and a coil spring 3 bearing against anof this shaft is another lever 89' which is connected by a link 98 with one of the arms 55.

Hence, when the arm 55 rises, as it does upon the tripping of the press, motion is transmitted to rod 88 in the opposite direction, thereby pulling the crank downwardly.

In the form of the invention illustrated in Fig. 2, where no provision for raising the form rollers is shown, crank81 is connected directly with lip 63 by a push and pull rod 92.

The drum 53 is appropriately driven vfrom the printing press through a gear 93 on its shaft upon shaft 39 of ink receiving roller 48. Gear 95 meshes with a gear 85 that rotates freely on shaft 33 and in turn meshes with gears '91 and 98, the latter gears being fixed with respect to rollers 31 and 38. Roller 48 is driven by friction' from roller 54 and also at times from rollers positively by the gears 95, 96, 91 and 98. Rollers 31' and 38{ may also be driven positively if desired, but we prefer to drive them frictionally bycontact with rollers 31 and 39 respectively.

The drive for shaft 28 upon which is mounted 33. A sprocket wheel I83 is formed integral with gear I82 and serves to drive a chain I84 which runs. over a sprocket wheel I85. sprocket is fixed to a short shaft 28' mounted in the frame member I8 in axial alignment with shaft 28, to which it is adapted to be operatively connected by means of a dog clutch comprising the part I88 fixed to shaft 28 and the part I 81 slidable on shaft 28 but held from turning. thereupon by a key or spline I88.

The reduction of speed effected by the gearing just described is preferably such that shaft 28 turns at a rate approximately one-tenth that of shaft 51. Hence the frame supporting the mixing' rollers 31, 31, 38 and 38' is shifted once for every five revolutions of the drum 53. The ductor roller 22 moves up to take ink from the fountain roller 2| twice for every ten revolutions of the cylinder I 2, ononce for every five revolutions, and the timing is such that the roller 22 returns to ink delivering position at substantially the same time as the shift 'of the mixing. rollers takes place. I

It is desirable not only to interrupt the transfer of ink from therollers of the upper group to the rollers of the lower group each time the press is tripped, but .also to interrupt the shifting of the mixing rollers and the oscillations of the ductor roller. In order to do this we stop the rotation of shaft .28 and with it the rotation of earns 21 and 43. This'is accomplished by means of a rod I89 connected with the arm 88, previously mentioned, and extending through a noddle pin II8 on a bell crank III pivotally mounted on the frame. A collar 2 fixed to the rod other collar II4 engages the lower side of the noddle pin. When the rod I89 is in its normal raised position the clutch I 86, I81 is in engagement. When however the rod I89 is pulled down because of the tripping of the press, collar II2 .moves bell crank III clockwise, producing a pull upon'a link II5 which is pivoted to, a shifting yoke IIB pivotally mounted on the frame at II1. By this means the clutch is disengaged and the.

rollers ofboth sets are clear of engagement not only with the receiving roller 48 but alsofwith the ductor roller 23. In this construction the shaft 33, to which the plates 34 are fastened, has keyed thereto a bracket 8 having a V-notch H9 at its lower end and a pair of upwardly extending spaced lugs I28 at its upper end. An 7 The latter j Coil springs I22 interposed between the arm I2I and the lugs I20 tend to hold the arm in a median position with respect to the bracket, as illustrated in-Flg. 6, which shows the parts in their normal running position. The arm swings back and forth due to the action of cam .43 and spring 44 which function in the same manner as in the case of arm 4| of Fig. 1. On the frame of the inker at I23 there is plvotally mounted a lever I24 connected at one end to a rod 209 and at the other end carrying a small roller I25 which is adapted to engage the sides of V-notch H9 in the bracket. When the rod 209 is pulled downwardly by means similar to that heretofore described with respect to rod I09 roller I25 rises into engagement with the V-notch and turns the bracket I I8 to its intermediate position and holds it there, thus maintaining the two sets of rollers 31, 31' and 38, 38' out of engagement with both of the rollers 22 and 40. In the event that there is no provision for stopping the shaft 20 simultaneously with this action upon bracket 8, the arm I2I will continue to swing back and forth, the springs I22.yielding to permit such action. The condition of these parts when the press has been tripped is illustrated in Fig. 5.

Operation-Assuming that the press is about to be started for a job of printing, it is desirable to ink up the rollers of the inker and apply a charge of ink to the form on cylinder I2. With the cyl inder II thrown off, that is in position B of Fig. 1, the operator pulls out bar 8| and starts the press. The form rollers 45, 46, 41 and 48 will then be in the raised position illustrated in Fig. 7, and thecrank 81 will be drawn down as shown in that figure. This crank is however disconnected from crank 18, the slide guide 80 and the bar 8|, and

the latter may be shifted to and held in the normal running position illustrated in Fig. 1. Ink will then be taken from the fountain roller 21 by ductor roller 22 and transferred to first one and then the other of the sets of mixing rollers 31, 31 and 38, 38 and from those sets alternately to the receiving roller 40 and ;by way of hepushes bar 8| in to normal position, locking cranks 81 and 18 together. The feed of paper sheets is also begun at the same time, the control of the sheet feeder being usually effected simultaneously with the operation of rod I1. The press is then in full operation. r

when the press is tripped, either manually or automatically, the roller 54 is immediately swung down away from ink receiving roller 40, and no further ink is delivered to the lower group of rollers. This interruption of the flow of ink to the lower group of rollers is the essential action of ourthrow-off. However we prefer at the sametime to stop the oscillation of the ductor roller and the shifting of themixing rollers, and in most cases we prefer also to raise the form rollers out of engagement with the form, all as previously and therefore especially to be avoided in an inker of the type illustrated where there is present a large quantity of ink in the rollers of the upper group, due to two sets of mixing rollers, each with a supply for several revolutions of the press.

Variations from the described structures may be employed. Accordingly we desire it to be understood that the scope of the invention is to be regarded as defined exclusively by the appended claims rather than by the foregoing descriptionv or the accompanying illustration.

Having thus described our invention, we claim:

1. In combination, an inker comprising a fountain roller, 2. ductor roller mounted to oscillate between ink receiving and ink delivering positions, an ink receiving roller mounted in fixed bearings, two setsof ink mixing rollers, means for moving one set into contact with the ductor roller and the other set into contact with the receiving roller, and vice versa, a set of rollers for carrying ink from said receiving roller to the form to be inked, and throw-off means for interrupting the transfer of ink from said receivin roller to said last named set of rollers.

2. In combination, an inker comprising a ductor roller mounted to oscillate between ink receiving and ink delivering positions, an ink receiving roller, two sets of ink mixing rollers, means for moving one set into contact with the ductor roller and the other set into contact with the receiving roller, and vice versa, a set of rollers for carrying ink from said receiving roller to the form to be inked, throw-off means for interrupting communication between said receiving roller and said last named set of rollers, and means associated with said throw-off means for interrupting the oscillation of said ductor roller.

3. In combination, an inker comprising a ductor roller mounted to oscillate-between ink receiving and ink delivering positions, an ink receiving roller, two sets of ink mixing rollers, means for moving one set into contact with the ductor roller and the other set into contact with the receiving roller, and vice versa, a set of rollers for carrying ink from said receiving roller to. the form to be inked, throw-oft means for interruptingcommunication between said receiving roller and said last named set of rollers, and means associated with said throw-off means for interrupting the bodily movement of said sets of mixing rollers.

4. In combination, an inker comprising a duetor roller mounted to oscillate between ink receiving and ink delivering positions, an ink receiving roller, two' sets of ink mixing rollers,

means for moving one set into contact with the ductor roller and the other set into contact with the receiving roller, and vice versa, a set of rollers for carrying ink from said receiving roller to the form to be inked, and throw-off means arranged to interrupt the bodily movement'of said sets of mixing rollers.

5, In combination, an inker comprising a ductor roller mounted to oscillate between re-- ceiving and ink delivering positions, an ink receiving roller, two sets of ink mixing rollers, means for moving one set into contact with the ductor roller and the other set into contact with the'receiving roller, and vice versa, a set of rollers for carrying ink from said receiving roller to the form to be inked, and throw-off means for interrupting the oscillation of said ductor roller and the bodily movement of said sets of mixing rollers. r

6. In combination, an inker comprising a duetor roller mounted to oscillate between ink receiving and ink delivering positions, an ink receiving roller, two sets of ink mixing rollers interposed between the ductor roller and the receiving roller,

-- means for moving one set into contact with the rupting the oscillation of said ductor roller and the bodily movement of said sets of mixing rollers.

'7. In an inker for a printing press, a fountain roller, a ductor roller, form rollers, ink mixing rollers adapted to receive ink from the ductor roller and to mix it during a plurality of cycles of the press, an ink receiving roller, means for producing relative movement between said mixing rollers and said receiving roller to cause said receiving roller to receive ink from the mixing rollers during a plurality of-cycles ofv the press subsequent to the first named cycles, means for taking ink from said receiving roller and advancing it toward said form rollers, and throwofi means for interrupting the transmission of ink from said receiving roller toward said forin rollers.

'8. In combination, form rollers, ink mixing rollers adapted to receive ink periodically and mix it during a plurality of cycles of the press,

an ink receiving roller adapted to receive ink from the mixing rollers during a plurality of cycles of the press subsequent to the first named cycles, means for transferring ink from said ink receiving roll-er to said form rollers, and throwoii means for separating the form rollers from the form and simultaneously interrupting the transfer of ink from the receiving roller to the form rollers.

9. In an inker for a printing press, form rollers, two sets of ink mixing rollers, means for receiving ink from one set of mixing rollers at a time and transferring it to said form rollers, means for shifting said sets of mixing rollers periodically to cause them to engage alternately with said ink receiving meansg'and throw-01f means for interrupting the transfer of ink to said form rollers- 'and for simultaneously interrupting said shifting ductor roller. I

t 11. In an inker for a printing press, form rollers. two sets of ink mixing rollers, means for receiving ink fromone set of mixing rollers at a time and transferring it to said form rollers, .cam.

' operated means for shifting both sets of mixing rollers periodically to cause the two sets to en gage alternately with said ink receiving means, and throw-ofi means for interrupting the transfer of ink from said mixing rollers to said form rollersand for simultaneouslydeclutching said cam operated .means.

12. In inker control mechanism for a printing press, an oscillatable member, inker throw-oi? means adapted to be actuated by the, oscillation of said member, a throw-off operating element adapted to be actuated automatically when the press is tripped, a crank arranged to 'turn about the same axis as said oscillatable member and' connected with said operating element, and means for locking said crank to said oscillatable member, said means when withdrawn from locking position serving as a handle for turning the oscillatable member independently of said crank.

13. In combination, an inker comprising a La ductor roller mounted to oscillate between ink receiving and ink delivering positions, an ink receiving roller, an oscillatable frame, two sets of ink mixing rollers mounted on said frame, means for shifting the frame periodically to move one set of mixing rollers into contact with the ductor roller and the other set into contact with the re-' ceiving roller, and vice versa, and throw-0E means for shifting said frame to an intermediate position with the two sets of mixing rollers out f contact with the ductor roller and the receiving roller.

Id. In combination, an inker comprising a ductor roller mounted to oscillate between ink receiving and ink delivering positions, an ink re-' ceiving roller, an oscillatable frame, two sets of ink mixing rollers mounted on. said frame', means comprising yieldable connections operating to shift the frame periodically to move one set of mixing rollers into, contact with the ductor roller and the other set into contact with the receiving roller, and vice versa, and throw-off means for shifting said frame to and-holding it in an intermediate position with both' sets of mixing rollers out of contact with the ductor roller and the receiving roller, such movements of, said first named shifting means as may tend to occur thereafter being absorbed in said yieldable connections.

15. In a printing press having a form carrying cylinder, mechanism for inking the'form comprising an ink supply, a group of form inking rollers, ink mixing rollers between the supply and the form inking group adapted to receive a charge of ink from the supply and work it independently of the form inking group during more than one revolution of the cylinder, and means to cause the mixing rollers to intermittently transfer ink to the form inking group for transmission to the form, and, throw-on means operable upon dis'continuance of the printing operation to render said last mentioned means'inoperative.

16. In a printing press having a form carrying cylinder, mechanism for inking the form comprising an ink supply, a group of form inking rollers, a plurality of sets of ink mixing rollers between the supply and theform inking roup, each set of mixing rollers being adapted'to receive a charge of ink from the supply and work it independently of the form inking group during more than one revolution of the cylinder, and means for causing each set of mixing rollers, one

set at a time, to transfer inkto the form inking group .for transmission to the form, and throwoff means operable. upon discontinuance of the printing operation to-render said last mentioned means inoperative." n

'17. In an inker for a printing press, an ink supply, form rollers, ink mixing rollers adapted to receive a charge of ink from the supply and to isolate it and mix it during a plurality of cycles of the printing press, ink transmitting rollers interposed between the mixing rollers and the form rollers, said mixing rollers and :ui

rollers I being arranged and operated to cause transfer of a charge of ink from the former to the latter, and throw-oi! means for interrupting the transfer of ink from the mixing rollers to the transmitting rollers.

18. In an inker for a printing press, an ink supply, form rollers, a plurality of sets of ink mixing rollers, each set being adapted to receive ink from the supply and mix it during a plurality of cycles of the press, ink transmitting rollers interposed between the mixing rollers and the form rollers, said mixing rollers and transmitting rollers being arranged and operated to cause each set of mixing rollers periodically to transfer ink to the ink transmitting rollers, and throw-ofi means interrupting the periodic transfer of ink to the transmitting rollers.

' v CHARLES W. HARROLD.

ALFRED STULL HARRIS.

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