USRE13469E - Cylinder feinting press - Google Patents

Description

J. H. BARR.

CYLINDER PRINTING PRESS.

APPLICATION 1:11.31) JULY 26,1911.

Reissued Oct. 1, 1912. 1 3,469.

8 BHEETHHEET 1.

J. H. BARR;

CYLINDER PRINTING PRESS.

APPLICATION FILED JULY 26, 1911.

Reissued Oct. 1, 1912.

J. H. BARR.

CYLINDER PRINTING PRESS.

v APPLICATION FILED JULYZB, 1911. Relssued Oct. 1, 1912.

B SHEETS-SHEET 3.

J. H. BARR.

CYLINDER PRINTING PRESS.

APPLICATION FILED JULY 26,1911.

Reissued Oct. 1, 1912.

a SHEETS-81?! 4.

J. H. BARR.

CYLINDER PRINTING PRESS.

APPLIUATION FILED JULY 26,1911.

3 SHEETSSHEET 5.

mtg-5552;;

1 3,469. 8 SHEBT8-BHEET 61 J. H. BARR.

CYLINDER PRINTING PRESS.

APPLICATION FILED JULY26,1911.

Reissued Oct. 1, 1912.

J. H. BARR.

CYLINDER PRINTING PRESS.

' APPLIGATION FILED JULY 26,1911.

8 SHEETS-SHEET '1.

Reissued Oct. 1, 1912.

J.H.BARB..

CYLINDER PRINTING PRESS. APPLIOTIO'N FILED JULY 26,1911.

.Rissued Oct 1,1912.

N "CIIliZ & N N

m i N X3 UNITED STATES PATENT OFFICE.

Join a. BARR, or KANSAS cirr, mrssoum;

CYLINDER PRINTING-PRESS.

Specification of Relssued Letters latent. Reissued Oct 1, 1912,

ori -1m No. 956,751, dated Ma a, 1910, Serial No. 448,246. Application for reissue filed July 26, 1911.

Serial No. 640,703. I

To dliwhom it consent.

Be known that I, J DEN H. BARR, a citinon of the United States, residing at Kansas Uit in the county of Jackson and State of issouri, have invented certain new and nseiiul Improvements in Cylinder Printing- Pmases, of which the following is .a speci float-ion. I

This invention relates to cylinder printing presses, and my Object is to produce a machine of this character whereby stacked envelops or sheets of paper may be automatically and reliably conveyed one by one to the printing mechanism and there printed and after the printing operation be restacked evenly and smoothly.

With this general object in view, the invention consists in certain novel and peculiar features of construction and organization as hereinafter described and claimed; and in order that it may be fully understood referonce is to be-had to the accompanying drawings, in which I Figure 1, is a side view of .a combined printing press and paper feed machine emodying my invention. Fig. 2, is a top plan view of the same. Fig. 3, is an enlarged side view of the major portion of the upper end of the press with the inner side of the frame omitted. Fig. 4, is a vertical longitudinal section on the line IV-IV of Fig. 2 and on the same scale as Fi 3. Fig. 5, is a vertical section on the line V of Fig. 1 and on the same scale as Figs. 3 and 4. Fig. 6, is a horizontal section :on the dotted line VI of Fig. 3. Figs. 7,, 8, 9, 10 and 11 are detail perspective views of parts of the machine. Fig. 12 is a view of a part of the opposite end of the cylinder from that .dlown in Figs. 1 and 3, and also shows contiguous parts in section. Fig. 13, is an enlar ed vertical longitudinal section on line I-XHI of Fig. 14, with the conveyor belt omitted. Fig. 14, is a section on the line XIVXIV of Fig. 13. Fig. 15, is a vertical section of a part of the cylinder of the machine as equipped with a sheet-paperchute and stacking receptacle, and Fig. 16 is a detail horizontal section to show chiefly,

a pair of dams. Fig. 17, is a perspective.

Wow of the printed-sheet-receiving recephole or box and the means for evenly stack- 3, connec" ing the sheets therein.

In the said drawings, 1 indicates the frame of the machine the same being of the with springs 3, bearing against the brackets and nuts 3 on the front ends of said bolts 3. Near their upper ends arms 3 are provided with circular openings 4, into which project set screws 5 for centering in said openings the cylindrical journal-caps 6 receiving the ends of a transverse shaft 7, and secured byset screws 8 or otherwise on shaft 7, is a cylinder 9 equipped with partitions 10 provided at diametrically opposite points with large openings 11 to accommodate parts hereinafter described, the peripheral of the cylinder at diametrically opposite points being divided into two similar sections by inwardly projecting segmentshaped portions 12, which por-tions provide between said sections external troughs or cavities extending longitudinally of the cylinder, and each section is equipped peripherally if desired, with a thin smooth cover .ing or tympan 13.

14 is a roller paralleling and adjacent to the cylinder and adapted to be equipped with a printing plate 15 and mounted rigidly on a shaft 16 journaledin the frame. A similar roller 17 is also arranged parallel with and adjacent to the cylinder and is mounted on a similar shaft 18 journaled in the frame and equipped with a belt-wheel hereinafter referred to, to be driven by a belt, not shown. Rollers 14 and 17 are equipped at one end with gear wheels 19 and 20 respectively which mesh with the gear wheel 21 of the cylinder,the length of the teeth of said gears being such that the cylinder may move-bodily toward and from said rollers without throwing its gear wheels out of mesh with the gear-wheels of said rollers.

22 are In projecting from the rock arms by the cross-rod 23 upon which is pivoted 'a pair of rock- arms 24 and 25 disposed at opposite ends of the cylinder.

The upper end of arm 24 is bifurcated at 26 and the branch-arms formed by said bifurcation have lugs 27 projecting toward shaft 18, and journaled between said lugs is an anti-friction roller 28 engaging a cam 29 secured on shaft 18. Arm 25 is also bifurcated at 30, one of the branch-arms formed by such bifurcation being prolonged upward at 31, and projecting from the said branch-arms of arm 25 are lugs 32 corre sponding exactly to ln s 27, and carrying between them an antiiction roller 33 to engage a cam 34 secured on shaft 18 at the opposite end of printing roller 17 cam 34 being an exact duplicate in form and arrangement of cam 29. These cams are adapted once in each revolution, by engagement with said anti-friction rollers, to cause swing arms 24 and 25 to swing toward their carryingarms 3, springs 35 interposed between arms 24 and 25 and arms 3 and mounted on pins 36 projecting from the last-named arms, resisting such movement and returning arms 24 and 25 to their original positions immediately after rollers 28 and 33 pass the crests or points of said cams. i

Pivoted on pins 37 carried'by lugs 27 and 32, are levers 38 extending through bifurcations 26 and 30 of arms 24. and respectively, toward arms 3, and equipped at their ends adjacent to the last-named arms with wear-plates 39, and at their opposite ends with set-screws 40 held by retractile springs 41 into peripheral enga ement with cams 42 secured on shaft 18 etween cams 29 and 34 and the printing roller 17, the points or crests of cams 42 being adapted once in eachrevolution, against the resistance of springs 41, by en gagement with set-screws 40 to rock levers 38 and raise their wear-plate ends above the plane of the lugs 43 of arms 3, for a purpose which hereinafter appears.

44 are levers pivoted to arms 24 and 25 in the vertical plane of lugs 45 projecting inward from levers 38, springs 46 connecting the lower ends of said levers with projections of arms24 and 25, tending to hold the upper ends of levers 44 between the planes of lugs 45 and arms 3. One of the levers 44 is provided with an arm 47 pivotally connected to the lower end of rod gage the underside of book 49, said crankarm having an upwardly projecting stop 56 for engagement at times with the hook,

and a notch 57 contiguous to the stop to receive. the hook at certain times, as hereinafter explained.

58 is a coil spring mounted on shaft 53 and bearing against bracket 50 at one end and at the other against a collar 58 secured on shaft 53 forthe purpose of holding yieldingly-depressed an arm 59 also journaled on said shaft on the plane of the longitudinal center of the machine, a stifi'er spring 60 being also mounted on said shaft and secured at its opposite ends to arm 59 and a collar 61, mounted on the shaft, to hold arm 59 pressed yieldingly downward upon the underlying angle-arm 62 of collar 61 rigidly secured to shaft 53. Under certain conditions hereinafter named, spring 60 will yield and permit arm 59 to swin upwardly independently of the shaft an its connections, it being understood in this connection and by reference to Fig.4 particularly, that the free end of arm 59 depends below the plate 52 and lies close to the periphery of the cylinder normally.

Referring now to the gripping mechanism which is in duplicate for the purpose of gripping and carrying two envelops or sheets of ,paper around the cylinder with each revolution thereof: 63 indicates a pair of inwardly-bowed swing-arms pivoted to and within the cylinder and connected by a rod 64, the two rods of the duplicate sets of arms 63 being connected by retractile springs 65, to a semi-circular link 66, the link being of such form to avoid the shaft 7. The free ends of-each pair of arms 63 project outwardly into one of the-troughs of the cylinder, the ends of the trou'gh'being recessed for such purpose, and within said trough is equipped with a longitudinally extending bar 67 provided at suitable points with jaws 68. Parallel with bar 67 and journaled in the free ends of swing-arms 63 is a rock-shaft 69 provided with jaws 70 disposed opposite and adapted. to clamp against the jaws 68, or an envelop or sheet 0 paper which may be interposed therebetween, this clampingaction occurring at the moment the anti-friction rollers 71 carried by and at the outer sides of the bowed arms 63, attain the crests or points of stationary cams 72 supported at opposite ends of the cylinder upon the inwardly projecting hub portions 73 of swing-arms 3. Secured upon one end of each rock shaft 69 is a crank-arm- 74,.projecting in the same general direction as the jaws 70 and connected by a link 75 to one end of the spring 7 6 coiled on rod 64 and having its opposite end" engaging the ea which, as will be understood by reference to 76 ten means hereinafter described, from' jaws 68 against the resistance of spring 76, and after the central point in 'such open ng movement of the 'aws 70 has been passed, the spring (is to continue such movement and hold the said jaws in such position until reclosed by means hereinafter described.

I Secured on the opposite end of each rockshaft 69, from the crank arm 74, is a bifurcatedrock-arm which projects in the same general direction as jaws 70, the branch 77 of each bifurcated. rock arm being of greater length than the companion branch 78, and projecting from the said rock-arm at the opposite side of the shaft is a-hook 79 which is disposed inwardly of the shaft and forwardly of the same with respect to the direction of rotation of the cylinder, preliminary to the opening movement of. the jaws 70, it being understood that the cylinder rotates in the direction indicated by the arrow, Fig. 4? In such rotation the hop engages a stationary pin 80 projecting 1nwardly from the contiguous side of the :frame, said frame beingprovided with a slot 81 to permit of such adjustment of said pin as to accommodate envelops or sheets of paper of varying lengths. As the hook 79 of each rock-shaft 69 engages said pin,

Fig. 4, is nearer the axis of the cylinder than the rock shaft, it first overcomes the resist-- ance of springs 65 and causes the connected arms 63 to swing outward slightly.- The resistance of the stronger spring 76 is then overcome and as a result the rock-shaft 69 is turned about a half a revolution and thus widely opens or distends the two sets of clamping jaws, the retractile-tendency of spring 76 accelerating the latter half of such opening movement. Immediately after the rock-shaft is thus turned a half revolution with the result described, the jaws of said shaft emerge from under the front end of the the latter emerges from under plate 52, this clam ing action of the jaws as hereinbefore plate 52 and at the sametime the outermost end of the longer branch 77 of the bifurcated arm just previously turned bypin 80,

comes into engagement with a second rigid pin 82 pro'ecting inwardly from the adjacent side of the frame, which pin is disposed a distance from the center of the cylinder slightly greater than the rock shaft and as a result reverses the operation of the latter until it ,has again passed the center, when the spring 76 completes such reverse operation and causes the jaws of the rock-shaft to snap toward the jaws of the cross-bar as state occurring as the rollers 71 ride over the crests of the cams 7 2. Immediately after the jawsare reclosed said rollersride down upon the cams and permit springs 65 to' again swing arms 63 inwardly to substantially the position shown in Fig. 4.

- sion to the shaft 88 journaled in similar bosses 89 -on the frame, these belts being so arranged as to frictionally engage an envelop or sheet of paperlying upon plate 52 and move it forwardly thereon until arrested by certain devices hereinafter described.

'90 is a belt wheel mounted on the. shaft 88, bet-ween pulleys 87 and connected by a belt 91 with a pulley 92 suitably journaled in a yoke 93 pivoted on shaft 88, said yoke being equipped with an angle-arm 94 resting and supported on an arm 95 projecting rearwardly from the upper end of a crankarm 96journaled on a shaft 97 journaled in the sides of the frame, and provided near each end with gear pinions 98 engagingvertical rack-bars 99 connected at their upper ends by an arch 100 and at their lower ends by a horizontal frame 101 equipped with a removable bed-p1ate102 adapted to carry a stack of envelops or sheets of paper to be printed, a stack of the former being shown and .indicated at 103.

104 indicates a vertical plat-e arranged in the plane of the rack-bars, against which the envelops or sheets of paper to be printed are stacked, as hereinafter more particularly referred to, the lower endof said plate'being secured to a lug or extension 105 of a substantially U-shaped frame 106 secured to vertical ribs 107 offramel. The plate 104 ter'minatesbelow the plane of belt 91 and is equipped near its upper endand at opposite sides of its verticalcenten with a pair dfbrackets 108 secured at their opposite ends to a tie-rod 109 connecting the sides 'of the:

frame'1. Plate 104 is provided with hori-Z zontal slots 110 through which. adjustableclampingscrews 111 extend into brackets 112 rigid with a pair of vertical guide plates 113, these plates 113' being adapted to brought in such relation as to admit snugly between them the stack of envelops 103 or a stack of letter paper, not shown, it being. understood that where sheets are to be print ed a larger bed, not shown, butxcorres ond ing in other respects to bed 102 WIll" beemployed.

For the Purpose of automaticalliielevating the envelop or sheet of paper feed-bed to accommodate the diminish'ing'size of the stack as the envelops, or sheets of paper are moved successively forward therefrom-by the belt 91, and thus facilitate the delivery of such envelops or sheets in rapid succesprinting mechanism, shaft 97 isequipped with a ratchet-wheel 114 adapted to be intermittentlyoperated by the pawl 115 pivoted to the rolon ation'31 of arm 25, and reciprocate by tfi g e rocking action hereinbefore mentioned, of said arm 25.

1 96. As a result the weight of the yoke 93 which as hereinbefore described is pivoted on shaft 88, is not imposed on arm 95, and

the pawl is'permitted to gravitate wholly below ratchet-wheel 114 and consequently does not affect such ratchet. As the belt 91 successively removes the topmost envelop or sheet of paper from the stack, it is gradually depressed by the gravitative action of the pivoted yoke and thus imposes the weight on shaft 88,-is not imposed on arm 95, and depresses the same. This depression through the connections described, raises the free end of the pawl and: causes the same on its next rearward movement, to engage and turn the ratchet-wheel 114 and, through pinions 98 and rack bar 99, raise the frame 101 and the stack of envelops or sheets of paper carried thereby, and to prevent lateral swinging movement of the pawl, it extends through the hook-shaped lower end of a guide 119, depending from plate 52. To further insure the elevation of the V stack in response to a very slight downward movement of the yoke and feed-belt 91, the guide 119 is provided with a wedge-arm 120 disposed toward the cylinder, and an arm. 121 is secured on pawl 115, the said arm 121 in the inoperative reciprocation of the pawl playing back and forth under wedge 120. When the pawl is raised however, as ex; plained, even if the elevation does'not bring arm 121 clear above the wedge, the former -will strike and ride upwardly on the wedge which thus insures a sufficient elevation of the pawl to cause it to engage and operate the ratchet-wheel and hence perform the function explained. For the purpose of holding the envelop or paper-carrying frame in the position to which it is adjusted by the pawl-and ratchet-mechanism, as hereinbefore explained, a spring-actuated pawl 122 is pivotally supported from and below plate 52, and engages the ratchet-wheel 114, said pawl 122 being provided with a handle 123 projecting up through an opening in plate 52 to enable the person in control to trip pawl 122 from engagement with the ratchet, to permit the envelo or paper-carrying frame to descend to its initial position to receive a new charge of envelops or sheets of paper.

124 indicates an angle-bar extending transversely of plate 52 and equipped at each end with a pair of adjusting screws 125 resting upon said plate, and near said screws and occupying a plane between them are screws l26-which extend down through said plate, the arrangement being such that by screwing the front pair of screws 125 downward and the rear pair upward or vice versa, the bar can be tilted downwardly and rearwardly or downwardly and forwardly, respectively, for a purpose which hereinafter appears, the an le-bar tilting on screws 126 as the fulcrum %or such movements.

127 indicates a pair of bars arranged longitudinally of and resting on plate 52 and* provided with verticallyslotted anglebrackets 128 bearing against the rear side of angle-bar 124;. Bolts 129 extend through the longitudinal slot 124' of angle bar 12 1 and also through the slots of angle-brackets 128, and are engaged by clamping nuts 131 for the purpose of clamping said angle-bar and hence the bars 127 the proper distance apart to accommodate envelops and sheets of paper of varying widths, the vertical slots .of the brackets being to permit bar 124 to be tilted as explained without affecting the position of bars 127. The bars 127 project beyond the rear edge of late 52 and have notches 132 in the inner S11. es of said projecting ends to snugly receive the front edges of guide 113, as shown most clearly in Fig. 10. Bars 127 are formed in the vertical planes of plates 113 with upwardly projecting guide walls 133 which toward their front ends, are preferably inclined inwardly to restrain the sheets of paper or envelops adapted to successively travel forward between them, from bucklin or bending upward at their edges, and sald bars are also provided with horizontal flanges 134 projecting inwardly from the lower margins of walls 133 and lying flatly on plate 52. The front ends of said flanges 13 1 terminate in arms 135 which fit against the front edge of plate 52 and depend below the same for the purpose of preventing the forwardly disposed edges of the stacked envelops or sheets of paper from catching on the front edge of the instead of passing freely upward a ove the same.

Secured adjustably in the longitudinal slot 136 in plate 52 cent-rally between c0n-' veyer belts 86 and below transverse anglebar 124 which bridges the lower strands of said belts, is a round-headed bolt 137, the head of said bolt being disposed at the upper side of plate 52 and in the path of each envelop or sheet of paper so as to compel the same to buckle upward slightly in the plane' of its longitudinal center, for a purpose which hereinafter appears, and to sharply define this buckhng action I provide a pivoted U-shaped guide 138, having a sleeve portion 139, pivoted to one end of the shaft of belt wheel 92, and arrangedwith its arms at opposite sides of the lower strand of belt 91 and converging downwardly and forwardly toward and resting at late 52 I lying the ower arm 0 formed with a depending flange 151 resting their free ends on plate 52 atopposite sides of the upward projection of said plate constituted by the head of bolt 137.

Secured to and depending from plate 52 at opposite sides of the plane of bolt 137, is

- a pair of bearings 140, (Figs. 3, 4 and 6,)

for a transverse'shaft 141 forming a support oat-ward of said bearings for a plate 142, projecting beyond the front edge of plate 52 and terminating at its free end at opposite sides of a notch 143 therein, in upwardly projecting flanges 144 of sufiicient length to normally pro ect above the plane of plate 52 under the pressure of a spring 144*secured to a collar 144 on the rod 109, and resting upon said plate 142'is the crank 145 of a transverse rock-shaft 146, j ournaled in bearings 147 secured to and depending from plate 52, the said rock shaft at its op site or outer end, being equipped wit-h a ownwardly-' rojecting crank-arm 148 to be engaged an each revolution of the cylinder 9, b a pair of eam-lugs'149 secured to the cylinder, as

shown at 150. a

151 is a late (see Figs. 13 and 14) overangle-bar 124 andon said lower arm and with a series of fingers 152, converging with respect to 52 and projecting be 0nd the front end of the same to about t e plane of the inner sides of flanges 144 of the plate 142, it being noted in this connection that the fingers 152 are disposed at such a slight angle with respect to plate 52, that they will hold an envelo' or sheet ofpaper flatly down upon 1 saidp'ate and thus guard against the former buckling or doubling under the frictional pressure imposed upon it by the forwardly movin The finger-equipped plate 151 is fitted upon a pair of upwardly projecting stud-bolts 151 and engaging said stud-bolts and rest ing upon said plate 151 are nuts 151, said nuts being utilized to vary the pressure of the front ends of the fingers upon the front end of plate 52. Said nuts also extend through a plate 153 overlying plate 151,

washers 151'fitting on said nuts between,

said'pla'tes 151 and 153, the last-named plate being prevented, by said stud-bolts extending through them, from moving laterally or longitudinally though it is capable of a slight vertical play. v

154 is an angle bracket secured toangle bar 124 centrally of the latter and depending from the .fr ont end of bracket 154 is a stud-bolt 155 provided with a nut 156 and with an expansion spring 157 bearing at its upper and lower ends against said nut 156 and plate 153, said plate being equipped with forwardly projecting fingers 158 overlying fingers 152 and terminating at their front ends in downturned ends 159 norrocked backward twice in;

plate lower strands of belts 86.

mally engaging the upper ends of flanges of the plate 142-, hereinafter termed the de'tai-ner. Fingers 152 and 158-are also hereinafter termed the lower and upper retainers.

160 indicates an adjustable wedge mounted on plate 52 and projecting beyond the f-ront edge of the same and adapted to be engaged by the crank arm 161, Fig. 1, of gripper shaft 69 to prevent the movable gripper jaws from clamping the envelop or sheet of paper down upon the stationary gripper jaws until its front end has reached detainer flanges 144 and thus insure that all of the envelops or sheets of paper shall receive impression from the "printing plate at correspondin distances from their front edges, it being urther noted in this connection that the upper retainers 158 are designed to hold the envelops or sheets of paper-against movement by belts 86 in the event that the detainer 142 is depressed before the envelop or paper has reached its flanges 161 is a circular flange projecting from the cylinder and provided at diametrically opposite points with notches 161 and at other diametrically opposite points with notches 161, and 1'61 are lips projecting outwardly and forwardly from the rear edges of notches 161'", with respect to the direction of rotation of the cylinder.

16-1 is an an le-arm projecting from arm 47 and nor-ma 1y engaging the inner side of the circular flan e, the parts being so arranged that one 0 the notches 161 shall pass arm 161 before the rear end of an env'elop or sheet of pa er is drawn forwardly. as hereinafter explained, oil the plate 52.

As a gripping mechanism emerges from below the plate 52, one of the jaws 70 of its rock-shaft as the latter is being turned to perform its clamping function, engages and presses arm 59 upward out of the path of the envelop or sheet of paper and then with the companion jaws clamps said envelop or sheet down upon the companion jaws 68 of the bar 67, and draws such envelop or sheet forward, the retainers yielding upward slightly under such movement of the envelop or sheet. The upward movement of arm 59 causes rock-shaft 53 to turn because spring is of greater strength than spring 56 the turning of the shaft of course throwing arm 55 rearwardly under hook 49, at this time held elevated against the resistance or springs 46, by the flange 161 underlying angle arm 161 of arm 47. It will thus be seen that, as the envelop or sheet of paper is being drawn forward, it willsustain the comparatively light pressure of spring 58, because the flange 161 upholds hook 49 through the engagement of hook 1G1 with the umlorlying flange 161% the pressure of spring 58 being so light that the arm makes n'o crease or-mark on the supporting envelop or sheet. In the rotation of the cylinder hook 161 cannot pass downward thrugh the notch 161 which first passes it because at such time the arm 55 sustains the downward pressure of hook 49 induced by springs ward by the gripping mechanism, clears the front endof plate 52 so that after-such envelop or sheet does clear the front, end of said plate and thus permits spring58 to eifect the depression of arm 59 and the forward movement of 'arm 55 until the stop 56 strikes the side of the hook, the said flange 161 retains the hook in its elevated position 4 over slot 57 against the resistance of springs 46, which of course tend to pull said hook downward. By thusmaintaining the hook elevated which is the case aslong as envelops or sheets are taken in regular order from plate 52 to the cylinder the levers 44 are maintained under lugs 45 of levers 38 and the latter are maintained with their rear ends above lugs 43, in which position they are free to be reciprocated by the cams 29 and 34 without moving arms 3 and consequently without aflectin the ition of the cylinder. When no s eet o envelop is passing thro-ughthe machine or in the event that an envelop or sheet fails to reach the detainer flanges at the roper time, the arm 59 after being raised y the gripping mechanism, as herelnbefore explamed, drops immediately back to its original 7 osition and thus disposes notch 57 under 100k 49 so that as the cylinder rotates and before the printin plates attain operative positions with relation thereto, the springs 46 will cause angle arm 161 to drop down through the first notch 161 encountered, it being noted in this connection that the notch 161which passes mm 161 before the said notch 161 attains a position below said arm is so narrow that arm 161 has no time to dro through it. As the arm 161 drops throng the notch 161, the hook 49 descends into notch 57 provided to accommodate such movement of the hook, and at the same time levers 44 are swung rearwardly from under lugs 45 of levers 38 to permit the springs 41 of the latter to rock their rear ends downward into the horizontal plane of lugs 43. As a result the next rearward movement imparted to levers 38 paper or by cams 29 and 34,'is transmitted to swing arms 3 for the purpose of swinging'the cylto prevent contact between it and the printing plates, it being noted in this connection that such movement is so slight that the ar wheel 21 remains in mesh with the gear wheels 19 and 20 to 'avoid anyinterruption in the rotative movement of the cylinder. The cams 42 effect the relevation of levers 38 immediately the rear end of the envelop of roller 14.but-,sa1d'levers "are immediately 44 are held out of the plane of movement of lugs 45 through the continued depression of angle-arm 161 by that portion of flange 161 between the notch-161 through which saidarm dropped and the notch 161 at the opposite of the cylinder. Because of this arrangement theprinting plates rot-ate out of operative relation with the cylinder before the latter is swung back toward the printing roller which action occurs by the engagement of the lip 161 of the notch 161 last referred to, engaging the inwardly project ing portion of the angle arm 161 and raising the same through said opening to the inner side of the flange, the hook 49 being incidentally raised above the plane of the notch 57 and the levers 44 being their original positions below lugs 45 of levers 38. It w1ll thus be seen that it is impossible for the cylinder to become defaced through contact with the printing plates.

It will be observed by reference particularly to Fig. 3, that when a gripper mechanism is passing the front end of late 52, the lip 161 at the opposite side of t e cylinder has still somedistance to travel before it reaches the vertical planeof arm 161 and that at such time the cams 24 and 39 are about ready to start levers 30 on the rearward part of their reciprooatory movement. Assuming that the said gripper mechanism 52 but that the other gripper mechanism is carrying its envelop or sheet, it will be seen that the depression of arm 69 immediately following its elevation by the first-named ripper mechanism, is not followed by the drop of the .hook 49 into notch 57 because flange 16-1 will not permit arm 161 to drop until it isreached by opening 161 by which time the tail-end of the envelop or sheet carried by the other gripper mechanism has passed the printing plate of roller 17 and received the impresslon of said plate. It will thus be seen that the circular flange is utilized to hold levers 44 under lugs 45 as long as possible to revent the throw-off of the cylinder until t c said envelop or sheet of paper has passed the second printing plate and that without utilizing said flange as described, or some other mechanism for inder bodily rearward a sufficient distance redepressed at their rear ends because levers restored toor sheet of paper passes the printing plate fails to pick up the envelop or sheet on plate mace .ent color from that used in connection with the printing plate of roller 14. After the de ression of arm 69 occurs and the throw o-= action has also occurred, it will be understood that hook 49 is occuping the lower part of notch 57 and is locked in such position because flange 161 is holding arm 161 depressed. With the parts as thus arranged, it will be seen that the next time arm 59 is raised by the gripper mechanism, spring 60 must yield because the shaft 53 is locked through the engagement of hook 49 with notch 57, and as soon as said gripper mechanism releases said arm 59, it will be depressed by said spring 60, which is employed simply to permit arm 59 to be raised y the grippers when the machine is runmn empty and therefore when arm 163 is he} depressed. for the greater part of the time by flange 161.

To guard against the rear end of the en velo or sheet of pa r as it is drawn forwar from under be ts 86 by the gri ping mechanism from swinging forward an thus possibly becoming de aced by the printing plate of roller 14, a guard 162 is secured to the transverse tie-bar 162, connecting the sides of the frame between roller 14 and the cylinder.

To guard against any possibility of the feeding mechanism becoming choked by the entrance into the feed-way of a number of envelops or sheets of paper simultaneously, I provide the following construction :163 indicates a pair of plates secured to and depending from late 52 and forming a journal fbr the shaft 164 extending parallel with the feed belts and at one side of the same, and provided at its rear end with a transversely extending crank-arm 165 equipped wit an angular separating device 166 projecting throughan opening 167 in plate 104, the rear arm of said separating device extending transversely of said opening 167 and bein of substantially rightangle triangular orm with its hypotenuse face pitched upwardly and rearwardly for the pur ose of compelling each envelop or sheet 0 paper as it passes such device to slide rearwardly slightly in order to attain a position at the upper side of the said. arm. J ournaled on the crank arm 165 of-shaft 164 is a rubber faced or equivalent faced feedroller 168 disposed in the lon 'tudinal center of plate 52, and projectm upwardly through the same and forwar 1 through opening 167 of plate 104 and held by a torsion .spring 169 mounted on arm 165, against the hub-portion of said separating device against free rotation, said spring permitting sari-d roller to turn when a single envelo or sheet of paper is clamped between 1t and the overlying feed belt 9-1, but offering a resistance in the event that two envelops or sheets of paper get between said roller and the feed belt, greater than or in excess of the friction between the said two envelops or sheets of paper in order to arrest or retard the lower one and thus permit the upper one to be carried rapidly forward by the belt. A torsion spring 170 is mounted on rock-shaft 64 with one arm bearing against the overlying plate 52 and the other arm secured to a notched arm 171 secured on the shaft, the arrangement being such that said spring 170 tends to raise upward crank-arm 165 and hold the retarding feed-roller against the belt 91 or any envelop or sheet of paper interposed between theroller and said belt.

Rearward of roller 168'is a second feedretarding mechanism, the same being constructed as follows :-172 and 173 are plates hinged. to shaft 141 and projecting rearfwardly and forwardly therefrom respectively, and held pressed yieldingly upward at their free ends by means of a torsion spring 174 mounted on shaft 141 and having each of its ends underlying one of said hinged plates. J ournaled .in the free end of plate 172 is a transverse shaft 175 equipped at each end with a rubber faced or equivalent faced roller 176 pressed upwardly through plate 52, against feed belts ,86 except when an envelop or sheet of paper is interposed between them. Shaft 175 is equipped with a rigid collar 157 and with a spring 178 bearing at one end against the plate 172 and at the other pressingsaid collar against said plate in order to guard against free rotation of said rollers. 179 indicates a transverse shaft journaled in the free end of plate 173 and equipped at its end in line with rollers 176 with rubber-faced ,or equivalent faced rollers 180. The said shaft is also provided with a rigid collar 181 and with a spring 182 bearing at one end against the plate 173 and at its opposite end against collar 181 to hold the same also against said plate and thus prevent free rotation of rollers 180, it being understood that the latter, like rollers 176, are pressed yieldingly upward by spring 174 through plate and against belts 86 when an envelop or sheet of paper is not interposed between them.

For the purpose of supplying ink to the printing plates, the following construction is provided :183' is across bar carried by the upper portion of the frame and journaled centrally therein is a vertical shaft 184, equipped with a pair of circular ink distributing plates 185, above and below bar 183, the upper one only appearing. and extending transversely across each plate 185 is a pair of ink-distributing rolls 186, journaled in bearing-frames 187 connected pivotally by links 188 with the upper end of'a pair of arms 189, provided with forwardly bent goose-neck portions 190 for a purpose which hereinafter appears. Arms 189 are pivoted at- 191 to upright arms 192, clamping-bolts 193 extending through arms 189 and slots 194 in arms 192, to permit of a slight pivotal adjustment of said arms 189. The arms 192 are secured to the upwardly projecting crank arms 195 of a rock-shaft 196 journaled in the lower portion of the frame and provided also with a rearwardly projecting rock-arm 197 from which the rod 198 extends downward through a bracket 199 projecting from said .frame (see full lines Fig. 2 and dotted lines Fig. 1). A nut 200 is secured on the lower end of said rod and an expansive spring 201 is mounted on said rod and bears at its upper and lower ends against said'bracket 199 and nut 200 to hold the rock-arm 197 yieldingly depressed. 202 is a bar pivotally connected to the rear end of the rock-arm 197 and provided with a slot 203 and equipped with a laterally projecting top-plate 204. A shaft 205, is journaled in bearings 206 of the frame and is equipped with a crank arm 207, carrying a roller 208, underlying and adapted once in each revolution of the shaft to engage plate 204, and raise bar 202 against the resistance of spring 201, forthe 'purpose of rocking shaft 196 and thereby causing rolls 186 to roll across plates 185 to distribute the ink thereon, one of each set of said rolls 186 thus engaging and supplying ink uniformly to a roll 209 journaled in suitable bearings carried by rearwardly projecting arms 210 secured to or cast with cross bar 183. The rolls 209 in turn transfer ink to rolls 211 also suitably journaled in bearings carried by arms 210 and adapted to supply ink to the printing plates of printing rolls 14 and 17, the rollers 211 being equipped with gear-wheels 212 meshing respectively with gear wheels 19 and 20'0f printing. rollers 14 and 17. To effect a thorough and uniform distribution of the ink on rolls 211, the shafts 213 of rolls 209 are capable of reciprocatory action in their bearings and at one end are prolonged and pivotally connected to rock-levers 214 secured on' a vertical shaft 215 carried by the frame, the opposite ends of said rock-levers having pins 216 engaging the cam-grooved collar 218 mounted on shaft 205. Mounted on the opposite end of shaft 205 is a gear wheel 219 meshing with and adapted to be driven by gear teeth 220 of shaft 18, equipped with belt wheel 221 hereinbefore referred to. Pivotally connected to a wrist pin or gear wheel 219 is a, link 222, pivoted at its opposite end for movement in a vertical plane, to the link 223 pivoted for movement in a horizontal plane to a floating link 224 rigidly secured to a lever 225 journaled on shaft 184 and equipped with a spring-actuated pawl, not shown, engaging a'ratchet wheel, not shown, on said shaft, in order that the rocking movement imparted to lever 225 mayimpart an intermittent rotary movement to the inking plates 185, for a more thorough and equable distribution of ink deposited upon said plate by inking mechanism, not shown, because of any suitable or preferred type.

- 220 is a gear-wheel meshing with gearwheel 21 of the cylinder 9 and journa-led on a stub-shaft 227 secured to the contiguous side of the frame. 228 is a grooved belt wheel rotatable with said gear wheel 226 and connected by a belt 229 with a belt-pulley 230 secured on shaft 84. 231 is a grooved guide-pulley engaging said belt between wheels 228 and 230 to tension it, said guide and tension pulley being journaled on the cranked inner end of a stud-bolt 232 secured .by clamping nuts 233 to the contiguous side of the frame, the connections described transmitting movement from the cylinder to the feed-belts 86 and hence to feedbelts 91.

234 is a. grooved belt-wheel rotatable with belt-wheel 228 and connected by a belt235 to a similar belt-wheel 236 of a transverse shaft 237 journaled in the frame, said shaft being equipped with a plurality of rotary kickers, consisting of small hubs 238 provided with outwardly projecting and preferably slightly curved arms 239 having their operative or convex faces covered by rubber or equivalent strips 240, toavoidinjury to the envelops as the latter after being printed, are stacked, as hereinafter explained.

241 indicates a guidechu.te arranged ver-. tically below the rear portion of'the cylinder and tapering downward and terminating in the vertical plane of the kicker arms when the latter are projecting rearwardly, the front wall. of the chute being pitched downwardly and rearwardly, by preference, to impart the taper to the chute, the side walls being disposed apart a distance exceeding the width of the envelo s, it being further noted that the upper e ges of the side walls extend substantiall concentrically of the cylinder and with t e rear wall, terminate in a plane a little below the axis of the cylinder, so that when hook 79 of one of the grip-per mechanisms engages and is operated by pin 80 to move the movable clamping jaws from engagement with the jaws 68 of bar 67 the printed envelop will be released by said jaws shortly after its lower or free end passes over the front wall of the chute and enters the latter, which envelop drops down through the chute and is directed by the same into the path of :twin them in an upright bottom of the angular receptacle 242 resting .upon the downwardly and rearwardly inclined support 243 carried b the frame, the upwardly projecting arm --said receptacle forming a backing for the envelops to mainsition as theyare successively stacked by t e kickers, it being further noted in this connection that to guard against lateral movement of the ens velops until they are stacked, the side walls of the chute are prolonged downward a'siatl 244 below the plane of the kicker-shaft and are also extended rearward to a plane be-. your] that described by the outer ends ofi the .kicker arms in order that the last two or three envelops stacked shall be between said side extensions 244, after the kicker arms have passed out of engagement with them-; iThe kicker arms as the stack of envelops in receptacle 242 is rapidly enlarged, exerts a direct rearward pressure upon it to cause saidreceptacle toslide directly rearward upon its support 243, and in order to guard against twisting movement of said lecep ta'cle asleeve 245 is secured to the upright portion of the receptacle and disposed out ward of one side of the same and fits slidpermit the downwardly disposed hook 251 of the front wall of the chute to be easily slipped over the bar and be supported thereby, the latter being? then adjusted vertically through the pin and slot connections to raise the chute until it is almost in contact with the cylinder.

' 252 indicates :a series of bars secured to and extending downward from bar 247- rearward of the kicker-shaft 237 and between :the kickers thereof to guard against any possibility of the envelops being carried around and forwardly under the kickershaft by'the kicker arms, said arms in approximately the horizontal plane of said 'Bhaft, being' bent to form downwardly and rearwardly extending'shoulders 253, to positively deflect the lower edges of the envelops rearwardly ofi said arms and toward the upwardly: projecting backing arm. of the receptacle.

Referring nowto Fig. 15, whichshows a printed sheet receiving receptacle and a chute to deliver such sheets thereto after released from the cylinder in the same manmcr as described with regard to the delivery of the printed envelops; 254 indicates the chute ada ted to be suitably supported in substantia ly the nme position and by the same means as tlu envelop chute, which of course is removed to accommodate the sheetpaper chute, the latter tapering toward its lower or delivery end and also curving rear- .wardly so as to cause the paper to travel mainly in a horizontal direction as distinguished from the substantially vertical movement of the envelops, and in order to ard against adhesion and possible bucing of each sheet of paper in the chute 254, 1 the latter is provided centrally with a spring .r'od1255 attached at its upper end to the upper end of the rear wall of the chute and extending downwardly in the latter and divergently with respect to said rear wall to about the plane which the lower edge of the isheet will occupy as it is released from the cyl inder,.the forward swing imparted to the sheet by the movement of the cylinder and by its own resiliency as it swings past and over the upper edge of the front wall ofv the chute causing it as it strikes said spring to bend or buckle forward over the latter, thisbending or buckling stiffening it so that as released by the cylinder, it will travel verttically downward without any tendency toadhere to the rear wall of the chute as might occur if it was brought flatly against the same. As it drops down intothe chute it 'straightens out and as it strikes the rod 256 :secured centrally in the chute to the lower port-ion ofthe front wall thereof, it bends or creases in the opposite direction or re- :versely, so that it cannot engage for its full wi'dth and possibly adhere to the underlying portion of the front wall, this reverse bend or crease imparted to it by said rod 256 causing it to emerge from the lower end of the chute and travel in a substantially straight -line andnot bend or float upward as soon as it emerges as would be the case if not so .creased or buckled. Immediately after it =emerges it strikes the downwardly and rearwardly sloping guide rod 258 secured to one edge of the top of the receptacle or box 259, the upper portion of said box or receptacle beyond said edge of its top being open so :that in conjunction with the opening 260 formed at the adjacent rear corner of the box, the sheets may be more readily grasped and removed therefrom, it being understood that they will be stacked one upon the other. To stack the sheets evenly I provide the following construction :261'is a rod mounted in guides 262 carried by the completely closed side wall of the box. 263 is a horizontal arm projecting from the rear end of said rod into the box through a slot 264 in said side wall. At its opposite end the arm 'is' bent rearwardly' at 265 and downwardly to form the depending arm 266 to move back "and forth endwise of the box into and out of a vertical groove 267 in the rear end wall and thus be constantly tapping against the rear edges .of the stack of sheets of paper therein to compel'said edges to lie flush with each other. A spring 268 is mounted on rod 261 and bears at its opposite ends against 'one of the guides 262 and the collar 269 on the rod for the purpose'of holding the depending arm 266 normally forward of the rear wall of the boX, and in order to fdrce said rod and consequently said arm rearwardly at suitable intervals said rod is provided with a depending arm 270 in the path of a rotary cam wheel 271 mounted on the kicker-shaft, said cam wheel being grooved to receive said arm 270 and assist in preventing rotative movement of the reciprocatory rod.

In general the operation of the machine is as follows: The stack of envelops or sheets of paper as the case may be, upon the vertically movable bed is carried upward thereby through the action of mechanism described, until engaged by the superposed feed-belt 91, the envelops or sheets before coming into engagement with the feed-belt being forced by the separating device 166 rearwardly a sufiicient distance to break the adhesive tendency which two envelops or sheets naturally have after being pressed flatly together. As the topmost one is carried forward by belt 91, it frictionally engages roller 168 and is compelledby fork arms 138 and belts 86 to pass under angle bar 124, the guide walls 133 tending to maintain the envelop or sheet of paper against lateral or twisting movement. As each envelop or sheet, is conveyed past the projection of plate 52, it is bent or buckled upward .at its center as hereinbefore explained, the said projection being so disposed that when the front bend of such envelop or sheet has reached detainer flanges 144, its rear end is still overlying and buckled or arched by said projection so as to occupy so much of the path that the following envelop or sheet will strike such buckled or arched rear end and be thereby prevented from overlapping the buckled envelop or sheet, it being understood that the friction rollers 176 and 180-co6perate with the belts in effecting the feed of the envelops or sheets. In the event that two envelops or sheets of paper get between the belts and one or two of said rollersat the same time, the latter act as retarders, that is to say, they cease to rotate because they offer a greater resistance to the progress of the -envelop or sheet engaging them than such envelop or sheet of paper offers to the superposed envelop or sheet engaged frictionally by the belt 91 or belts 86. It will thus be seen that at four points in the progress of the envelops or sheets there are provided means for guarding against the passage to the cylinder of more than one envelop or sheet at a time, said means being the separating device 166, the roller 168,

one of the gripping mechanisms the spring 60 will yield sufiiciently to permit arm 59 to swing upward slightly to accommodate the passage below it of two or more envelops or sheets simultaneously without injury thereto. It will be understood the parts are so timed and proportioned with respect to each other, that when one envelop or sheet is being printed the preceding one is delivered into the chute by the operation of the gripping mechanism by pin 80, such pin as hereinbefore explained effecting the opening of the gripping jaws, the second pin 82 reclosing said jaws upon the envelop orsheet of paper on plate 52, at about the same instant that the detainer is depressed, as hereinbefore explained. After the envelops or sheets of paper are dropped into chute 241 or 254, respectively they are stacked as hereinbefore described.

stricted to the exact details of constructionshown and described as obvious modifications will suggest themselves to one skilled in the art.

It will be seen that the impression cylinder is provided with two impression sur-.

faces 13, and constitutes with the form cylinder 14 a rinting couple.- If a sheet is improperly ed to one of the impression surfaces the impression cylinder will be thrown off impression or out of contact with the form i cylinder at the time that the sheet should have been printed had it been properly fed, and the impression cylinder would be automatically thrown on impression or returned to its printing position in timeto present.v

the sheet fed to the other impression surface to the'form cylinder. If no sheet should be fed to the other impression surface, however, the impression cylinder would again be thrown off impression on.

out of printing position.

Having thus described the invention what I claim. as new and desire to secure by Letters Patent, is

1. In a printing press, a printing-plate carrying roller suitably driven, an impression cylinder held yieldingly toward said plate and geared to said roller, a gripper mechanism carried by the cylinder and consisting of jaws bearing a hinged relation,

an envelop or paper-sheet-supporting plate conti one to the cylinder, means to open said aws as the cylinder revolves, means to project the gripper mechanism beyond the 5 periphery of the plate as it passes the latter, I

tiguousto the cylinder, means to open said jaws as the cylinder revolves, means to pro- ]ect the gripper mechanism beyond the 2! periphery of the plate as it passes the'latter,

an arm intercepting the path of forward movement of a sheet of paper or envelop upon said plate, and means as the gripper mechanism passes said plate to close the jaws II and cause them in such closing movement to first move said intercepting arm out of the path of said envelop or sheet of pa er and then close u on and draw the latter orwardiy ofi the p ate.

3. n a printing press, a printing-platecarryin roller suitably driven, an impression cy'inder held yieldingly toward said plate and geared to said roller, a gripper mechanism carried by the cylinder and con- 85 sisting of jaws bearing a hinged relation, an

envelop or sheet of paper supporting plate contiguous to'the cylinder, meansto open said jaws as the cylinder revolves, means to project the gripper mechanism beyond the i M periphery of the plate as it passes the latter,

an arm intercepting the path of forward movement of a sheet of paper or envelop upon said plate, means as the gripper mechanism passes said plate to close the jaws and cause them in such closing movement to first move said intercepting arm out of the path of said envelop or sheet of aper and then close u on and draw the atter forwardly off tiie plate, and means to return said arm to its original position after the envelop or sheet of paper has been wholly withdrawn from the plate.

.4. In a printing press, a printing-platecarryin roller suitably driven, an impression cy inder held yieldingly toward said plate and geared to said roller, a gripper mechanism carried by the cylinder and consisting of jaws bearing a hinged relation, an envelop or sheet of paper supporting plate contiguous to the cylinder, means to open said jaws as the cylinder revolves, means to project the fgripper mechanism be nd the periphery o the plate as it passes e latter an arm intercepting the path of forward movement of a. sheet of paper or envelop upon said plate, means as the gripper mechanism passes said plate to close the jaws and cause them in such closing movement to first move said intercepting arm out of the path of said envelop or sheet of paper and then close upon and draw the latter forwardly otf the plate, means to return said arm to its original position after the envelop or sheet of paper has been wholly withdrawn from the plate, and means whereby the cylinder is moved away from but not out of gear with said roller after the envelop or sheet of paper has received its impression from said printing plate.

5. Ina cylinder printing press, the combination of a printing roller,v a cylinder geared to said roller, yielding means holdmg the" cylinder in the plane of movement of the printing surface of the roller, oscillatory arms supportin the cylinder, rock 3; arms pivot-ally carried by said cylindersupporting arms and held with their free ends pressed yieldingly therefrom, levers pivotal-1y carried by said rock-arms, means holding said levers inoperative with respect 93 to the cylinder-supporting arms, means rotatable with the said roller for imparting endwise movement to said levers toward the I cylinder-supporting arms, means to trip :the

means holding said levers in said inopera- 95 tive position, means to throw said levers to operative. position after said holdin means, is ripped, and means toswing said rockarms toward the cylinder-supporting arms to cause said levers to swing the cylindersupporting armsand withdraw the cylinder fronr the plane of movement of-the printing surface of said roller without throwlng said roller and cylinder out of gear.

v 6. In a c linder printing ress, the combination o 3 a rinting rol er, acylinder geared to said ro ler, yielding means holding the cylinder in the plane of movement of the printingsurface of the roller, oscillatoryarms supportin the c linder, rock-arms pivotally carrie by sai cylinder-supporting arms and held with :their free ends pressed yieldingly therefrom, levers'pivotally carried by said rock-arms, means holding said levers inoperative. with respect to the cylinder-supporting arms, means rotatable with the said roller for imparting endwise movement to said' levers toward the cylinder-supporting arms, means to trip the means lIOIdIHg'SlIld levers in said inoperative 12 position, means to throw said lovers to operative position after said holding means is tripped, means to swing said rock-arms to ward the cylinder-supporting arms to cause said levers t0 swing the cylinder-so porting arms and withdraw the .cylinder rom the plane of movement. of the printing surface of said roller without'throwing said roller and c linder out of gear, and means for restoring said levers to inoperative relation 139 pivotally carried by said cylinder-support ing arms and held with their free ends pressed yieldingly therefrom, levers pivotally carried by said rock-arms, means holding said levers inoperative with respect to the cylinder-supporting arms, means rotatable with the said roller for imparting endwise movement to said levers toward the has cylinder-supportingarms, means to trip the means holding said levers in said inoperative position, means to throw said levers to operative position after said holding means is tripped, means to swing said rock-arms toward the cylindensupporting arms to cause said levers to'swing the cylinder-supporting arms and withdraw the cylinder from the plane of movement of the printing surface of said roller without throwing said roller and cylinder out of gear, and cams rotatable with said roller for restoring said levers to inoperative relation with respect to the cylinder-supporting arms.

8. In a cylinder printing pressfthe combination of a printing roller, a cylinder-geared to said roller, yielding means holding the cylinder in the plane of movement of the printing surface of the roller, oscillatory arms supporting the cylinder, rock-arms pivotally carried by said cylinder-supporting arms and held with their free ends pressed yieldingly therefrom, levers ,pivotally carried by said rock-arms, means holding said levers inoperative with respect to the cylinder-supporting arms, means rotatable with the said roller for imparting endwise movement to said levers toward the cylinder-supporting -arms, means to trip the means holding said levers in said inoperative position, means to throw said levers to operative position after said holding means is tripped, means to s ing said rock-arms toward the ylinde supporting arms to cause said levers to swing the cylinder-supporting arms and withdraw the cylinder from the plane of movement of the printing surface of said roller without throwing said roller and cylinder out of gear, means for restoring said levers to inoperative relation with respect to the cylinder-supporting arms, and means to maintain the cylinder in inoperative relation with respect to the printing surface of said roller for a part of its revolution after said lever has been restored to its inoperative relation with respect to the cylinder-supporting arms. v

- 9. 'In a cylinder printing press, the combination of a printing roller, a cylinder geared to said roller, yielding means holding the cylinder in the plane of movement of the printing surface of the roller, oscillatory arms supporting the cylinder, rock-arms pivotally carried by said cylinder-supporting arms and held with their free ends pressed yieldingly therefrom, levers pivotally carried bysaid rock-arms, means holding said levers inoperative with respect to the cylinder-supporting arms, means rotatable with the said roller for imparting endwise movement to said levers toward the cylinder-sup porting arms, means to trip the means holding said levers in said inoperative position, means to throw said levers to operative position after said holding means is tripped,

means to swing said rock-arms toward the cylinder-supporting arms to cause said levers to swing the cylinder-supporting arms and withdraw the cylinder from the plane of movementof the printing surface of said roller without throwingsaid roller and cylinder out of gear, means for restoring said levers to inoperative relation with respect to the cylinder-supporting arms, and means rotatable with said cylinder to maintain the same in inoperative relation with respect to the printing surface of said roller, for a part of its revolution after said lever has been restored to .its inoperative relation with respect to the cylinder-supporting arms.

10. In a cylinder printing press, the combination of a printing roller, a cylinder geared to said roller, yielding means holding the cylinder in the plane of movement of the printing surface of the roller, oscillatory arms supportin the cylinder, rock-arms pivotally carrie by said cylinder-supporting arms and held with their free ends pressed yieldingly therefrom, levers pivotally carried by said rock-arms, means holding said levers inoperative with respect to the cylinder-supporting arms, means rotainder out of gear, means for restoring said levers to inoperative relation with respect to the cylinder supporting arms, a circular flange rotatable with and concentric of the cylinder and provided with an opening, a hook-arm rigid with said holding means, and means for holding said hook-arm pressed against the inner side of said circular flange and for drawing said hook-arm outwardly through said opening as the rotation of the cylinder disposes said opening

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