US505961A

US505961A - Printing-machine

Info

Publication number: US505961A
Authority: US
Publication date: 1893-10-03
Anticipated expiration: 1910-10-03

Description

(No Model.) 6 sweets-Snead.

W. SCOTT'.

PRINTING MACHINE.

Patented 001;. 3, 1893.

(No Model.) e'sheets-sheet 2. W. SCOTT. PRINTING MACHINE.

' (No ModeL) 6 Sheets-Sheet 3.

W. SCOTT.. PRINTING MACHINE.

No. 505,961. v l Patelled Oct. 3,1893.

BR l sa wmv/w ,y wuwwboz a 3513 ftozneg g l (N6 Model.) Y 6 Sheets-Sheet 4.

W. SCOTT.

PRINTING MACHINE.

Nog 505,961. PatentedoG-t. 3,1893. y

@9H/wwwa (No Model.) @sheets-sheet 5,

' W. SGOlT'J.`

PRINTINGr MACHINE. A N0.5o5,961. Patented-oet. 3,1893.

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W. SCOTT. PRINTING MAGHINE.

PPatented Oct. 3, 189131*v .NITED STATES PATENT OFFICE.

WALTER SCOTT, OF PLAINFIELD, NEW JERSEY.

PRINTING-MACHINE.

SPECIFICATION forming part-of Letters Patent No. 505,961, dated October 3, 1893. Application tiled March 16, 1891'.A Serial No. 385,241. i (No model.)

To all whom t may concern:

Be it known that I, WALTER SCOTT, a citizen of the United States, and a resident of Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Printing-Machines, of which the following is a specification.

My invention relates to stop-cylinder printing machines inV which the cylinder makes two revolutions to each forward stroke of the bed, and is at rest on the return stroke, and my invention consists in the combinations of the devices hereinafter described, and is particularly pointed out in the appended claims.

Inthe accompanying drawings formingpart of this specification, Figure l is a side elevation of one form of the invention, the figure being in two sections, to be joined end to end. Fig. 2 is a View, partly in section of one end of the cylinder and a part of the bed. Fig. 3 is a side elevation of a modification of the cylinder moving mechanism. Fig. 4 is a sectional view, on the horizontal plane indicated by line 4-4 in Fig. 3, of the same. Fig. 5 is a sectional view, on the vertical plane indicated byline 5-5 in Fig. 3, of the same. Fig. 6 shows a side elevation of a second modification of the cylinder moving mechanism.

Fig. 7 is a vertical sectional View on the plane indicated by line 7--7 in Fig. 6. Figs and 9 are elevations and central vertical sections, respectively, of devices for moving the cylinder. Fig. 10 is a side view showing the stopping and starting mechanism for the impression cylinder at the incluent the bed begins its forward stroke, andthe cylinder is started. Fig. l1 is an end view showing a detail of the last named mechanism. Fig. 12 is a plan view of part of the bed, one set of inkers and both sets of dampeners, and Fig. 13 is a view showing the mutilated gear of the impression cylinder and the segment, separated.

The type bed T runs on suitable guides and is reciprocated by any suitable means (not shown) commonly used for that purpose. Upon this bed I have shown two color forms or stones l0 and 1l of a lithographie press, but it must be understood that my invention is not limited tosuch a press, since the stones can be replaced by type forms for polychromatic or other printing'. Each form (and by this term, l include the type form of the letter press and the color forms or stones of the lithographie press) is inked by its own colorl rolls. The form 10 is in-ked by the rolls I, and the form 11 b v the rolls K. A fountain 12, ductor roller 13, distributing rollers 14, and table 15 supply ink of one color to the rollers I, while fountain 16, ductor 17, distributing rollers 18 and table 19 supply ink of another color to the rollers K. Since the form 10, in one position is under the inner two of the inking rolls K, it is necessary to `when the bed has moved far enough to the right to get the form 10 from under them,

they may be lowered into the position shown in dotted lines. When `the bed is in the Vposition to the right shown in dotted lines,

the inner two of the rolls IA are in the raised position shown in dotted lines, and may be .lowered when the form 11 has moved enough to the left to be clear of them. It will be un'- derstood that in each case, the rolls are lifted just before the form they should not ink comes under them, so Athat they ink their own form as it moves in each direction.

When using the machine for lithographie purposes, water rolls for each stone are used. The stone l0 is supplied with water by rolls 20, ductor roll 2l and roller and fountain, 22. The stone 1l is supplied with water by rolls 23, ductor 24, and roll and fountain 25. rolls 28 are lifted so that they will clear the form 10, and the rolls 22 are lifted so that they will clear form 1l. Rolls 23 are shown in full lines in their raised positions, while the dotted linesiudicate their lower positions. The full lines show the lower positions of rolls 20, and the dotted lines, their raised positions. These water rolls may be lifted by any suitable means, such as those above referred to in connection with the lifting of the ink rolls.

The

In Fig. 12, I show deviceswhich raise and lower theinkers and dampen ers for the above named purposes, as follows: The shafts of the inkers K are fitted at each end with disks l, the shafts of dampeners 23 with disks on, and shafts of dampeners 2O with disks n. The shafts of inkers I are provided with like disks (not shown). Disks Zm are in the same vertical planes as the grooves p, 19, and disks n (and the disks of inkers l) are in the same vertical plane as the grooves q, q. The bed T is provided with grooves p, q, at the sides of and parallel to theforms 10, 1l. The grooves p, q, are not in the same longitudinal vertical plane, but are placed as shown. Grooves 19, 1J, are adjacent the form l0 and grooves q, q, are adjacent the form 11. The disks, Z, fm, fn, are of such size that when they rest on the bed T their rollers K,23, 20 (and I) are lifted clear of the forms, and the grooves p, q, are of such depth that when they are under the disks Z, m, n, the rollers K, 23, 2O (and I) rest on the form. By this arrangement, the inkers I, K, and the

dampeners

20, 23 always coact with their proper form and are always out of the path of the other, as above set forth.

The impression cylinder() makes two revolutions to each forward stroke (to the right in Fig. l), and is at rest or stopped during the return stroke, of the bed. The impression or drum surface shown in dotted lines of the cylinder C extends nearly all the way around, there being, preferably, a clear space or longitudinal slot 26, which is at the under side of the cylinder when the cylinder is at rest after the second revolution and also when it has made one revolution on the forward stroke of the bed. This slot permits the bed and forms to move back on the return stroke without touching the cylinder. In this slot I place the grippers 27. Guides 28 and 29 hold the paper from falling away from the cylinder as the latter revolves. Brushes 30, common in this class of machines, may be used to smooth the paperagainst the impression surface.

Figs. l and 2 show one form of my new mechanism for turning the cylinder C during the forward stroke of the bed. I placea mutilated gear 31 on one end of the cylinder C with its cut away portion in juxtaposition to the slot 26. This cut away or mutilated portion is opposite the bed when cylinder C is at rest after the second revolution 'and also when it has made one revolution during the forward stroke of the bed. On the bed is a rack 32, with the end portions of which the mutilated gear 3l meshes, after the cylinder C has been started and also carried by the dead point where the mutilated portion of the gear 3l is down when the bed is in the middle of its forward stroke.

In theform of my invention shown in Fig. 1 it is not material whether the rack 32 be continuous or in two sections, each as long as or a little longer than the gear 3l, the sections being placed on the side of the bed and to- Ward the ends. To carry the cylinder over and beyond the said dead point, I place a segment of a gear 33, on the cylinder C in juxtaposition to the slot 26, and in a plane different from that of the gear 3l, and on the bed at its middle section I place the movable rack portion 34 to mesh with the segmental gear 33 on the forward stroke of the bed. Rack portion 34 is guided bylugs 35,36 on the bed in its up and down movement. This portion 34 is supported by two crank levers, 37 and 38, and links 39, 40, each pivoted at one end to the portion 34, and at the other end to one of the crank levers, as shown. The upper ends of the levers 37, 38 are connected together by the link 41, pivotally joined to each. The levers 37, 38 each have a roller at the lower end for co-operation with one of the

cams

42,43 on the framework,ofthe machine. In the position shown in Fig. l,the rack porwtion 34 is in its raised position ready to co-operate with the segment 33. In this position the link 40 rests against a stud 44, on the bed, so that the knuckle joints formed by the levers and links cannot be moved farther to the right, and the portion 34 cannot be moved down eX- cept by swinging the upper end of lever 38 f' to the left moving the joint of lever 38 and link 40 to the left of the imaginary line forming the fulcrum points of said lever and link. When the bed has moved to the right until the roller of lever 37 has run up the cam 42 and lowered the portion 34 by moving the levers, the lever 38 abuts against a stud 45, which limits the motion in that direction. When the bed moves to the left, the roller of lever 38 runs up cam 43 operates the levers, and raises the portion 34.

The devices operating the portion 34-are shown and claimed in my Patent No. 322,132, dated July 14, 1885. v

The devices thus far described only rotate the cylinder C and carry it over the dead poi-nt after the cylinder has been started. To start the cylinder, and bring its mutilated gear 3l into mesh withV the rack section; and to stop it when thebed has reached its right hand position, the starting and stopping devices shown in my Patent No. 203,678, dated February 19, 1884, can be used. In Figs. l0 and 11, I show a form of this starting and stopping mechanism as eo-acting with the segment 33. The arm ct, having a toothed rack b on its free end moves on or with shaft or stud c in the frame of the machine. Rig-idly xed to or integral with arm a are the arms d, c, carrying rollers f, g, respectively. A shaft h (which maybe themain driving shaft of the machine) carries two cams t', k, for coaction respectively with the rollers f and g. (It is obvious that a closed cam coacting with one roller, asf, or one cam, a roller and a spring, may replace the rollers and cams shown.) The shaft 72, makes one complete turn to one forward and one backward stroke of the bed,`T,and the cams 1l, 7s, are so shaped that at the beginning of a forwardstroke IOC (that is,'the position shown vin Fig. 1 0) of the bed, cam t', through yroller f, and arms d, a, starts the segment 33, and so causes the gear 31 to mesh with the rack 32. Cams i, k, are so shaped that, when the bed T is at the middle of its forward stroke,y the rack/b is clear of the segment 33, and rolls into mesh with the said segment at the end of said forward stroke. During the return (or non-printing) stroke of the bed, the rollers f, g, rest on the circular parts of the cams t', k, and the arm a, segment 33, and cylinder C, are at rest in the position shown in the drawings.

The feeding cylinder F and delivery cylinder D are geared with the impression cylinder at the end opposite that where the gear 31 and segment 33 are placed, the gear on cylinder C being a full Wheel. These cylinders are also geared to cylinder C at'the end'and by the gearing shown: the mutilated gear 31 meshing with gear 46 on cylinder F and with gear 47 on cylinder D.

The feeding cylinder F is placed above the cylinder C, and is of the same size, so that it makes two revolutions on the forward stroke of the bed and is stopped on the return stroke. Grippers 48 on the feed cylinder take the sheets from the feed board 49 and gages 50, or other suitable feeding apparatus, and guides 51 hold the paper to the feed cylinder.

The delivery cylinder D is geared to the' impression cylinder C in the manner described, and makes three revolutions during the forward stroke of the bed and is stopped during the return stroke thereof. The grippers 52 on the delivery cylinder take the sheets from the impression cylinder as hereinafter described, and deliver them to fliers 53.

Tapes 54 about the cylinder D vand roller 55 in connection with pressure rolls 56 run the sheets upon the Iiiers, which deliver them to the board 57. A tension roll 58 on pivoted arms 59 is used to obtain a proper tension of the tapes. The arms 59 may be counterweighted or be held up by suitablesprings.

The grippers of the feed, impression and delivery cylinders are opened and closed at the proper time (hereinafter referred to) by any suitable mechanism commonly used for that purpose. I have not deemed it necessary to show such mechanism as it may be of well known forms. The feed gages 50 are operated at the proper times by any means commonly used for that purpose.

The operation of the above described devices when used for lithographie purposes is as followsz-In practice, there would be a sheet of paper held `by thegrippers 27 of the cylinder C, the said sheet extending partly around the cylinder C and partly around the cylinder F,`as shown in dotted lines. Then as the type bed moves to the right in Fig. 1, the cylinder C is started by suitable devices, such as shown in my Patent No.

293,678, above referred to, for instance, and` then rack 32 and gear 3l mesh to rotate the cylinder C which now takes an impression from the formlO. The inner two of the ink rolls K drop down as described when the form 10 is out of the way. The water rolls 23 drop down after form 10 has passed, in time to wet the form 1l'. The grippers of the cylinder C remain closed as they pass the delivery cylinder D the first time, and open as they pass by the second time, so that the sheet takes impressions from forms l0 and ll in succession. The form 11 is inked by the rolls K, is next wetted by the rolls 23, and then passes under the cylinder C which takes an `impression on the paper. It will be noted that the form 1,1

may be wetted by the rolls 23 just previous A to the second impression, so that all danger Y delivery cylinder D, they open, releasing` the sheet, which is grasped by the grippers 52 of the cylinder D. After passing the rolls 56 the grippers 52 open and the sheet is run on to the iiiers 53 by the tapes 54 and rolls 56, and the fliers throw the sheet on the board 57 with the printed side up. In the position shown in Fig. 1, the grippers 48 of the feed cylinder F are closed (without grasping a sheet on the board 49) and remain closed until after they have passed cylinder C, opening before reaching the board 49. They then close andgrasp a sheet from the board, and open as they approach the imaginary plane passing through the axes of cylinders C and F in time for the grippers 27 of the cylinder i C to close and grasp the sheet which is thus transferred to the -cylinder C, on the secondl revolution thereof. When the bed T has reached its extreme right Vhand position, all the cylinders are in the positions shown, and a sheet extends partly around cylinders C and F as hereinbefore described.

During the forward stroke ofpthevbed, and just after the form 10 has passed them and before form'll has reached them, the rolls 2O vare lifted into the positions shown in dotted lines to clear the form 11 and remain up until that form has moved to the left far enough to be clear of them, when they may be lowered if desired. The inner two ofthe rolls I are lifted after form lO has passed them-and before form 1l has reached them, and remain iup until form llrhas moved to the left far lenough to be clear of them, when they are lowered. Therack portion 34 is in its upper position during theforward stroke of the bed,

and meshes with segmental gear 33 at the proper time to continue the rotation of cylinder C. As the bed approaches the end of the stroke, the lever 37 is operated by thevcam 42 and lowers the rack portion 34. VAs the bed approaches the limit of its throw to the right, and as the rack 32 runs` out of mesh the bed, the three cylinders remain at rest. r["he inner two of inking rolls I are dropped IOO IIO

as soon as the form 11 has moved from under them; dampening rolls 20, with the form of roll lifters shown, will be dropped (after form 1l has moved from under them) to wet form l after it is inked. The rack 32 is clear of gear 31, and rack portion 34 is down out of its operative position. As the bed approaches the left hand limit of its throw, the lever 38 is operated by cam 43, and the rack portion 34 is raised to its operative position.

In Figs. 3, 4 and 5, I have shown a modification of the devices for carrying the cylinder C over the dead point between its first and second revolution; these devices are used, also, for starting and stopping it. The cylinder C has the mutilated gear 3l and the segment of a gear 33, which is preferably in the same plane as gear 3l and completes the circle thereof when moved outward. The segment 33a is part of a sliding plate 60, held to and guided on the end of the cylinder C by

lugs

61, 62 that overlap it as shown. The

sliding plate has an elongated slot through which the shaft S of cylinder C passes, so that there is no interference between the two. The plate has a roller 63 on a stud 64 which engages with a circular groove in a plate 66. The plate 66 is guided by lugs 67 on the frame of the machine, as shown, and has an elongated slot 68 through which the shaft S of the cylinder C passes, thus avoiding interference. A rod 69 is pivoted atits upper end to the slide or plate 66, and at its lower end is pivoted to a guide link 70. Link 70 is pivoted at 71 to the frame work of the machine. The rod carries a roller 72 at its lower end to engage :in and be operated by the grooved cam 73 on shaft 74. The arrow indicates the direction of motion of cam 73. In the positions shown the bed is just starting on the forward stroke, and the roller 72 is entering that part 75 of the cam 73 that holds the plate 66 downward to engage segmental gearg33a with rack 32 to start the cylinder O. The segment 33a is held down until the bed reaches its farthest right hand position when the roller 72 enters that part 76 of cam 73`that holds plate 66 in its upper position, and so moves segment 33 up out of mesh with rack 32. The cylinder is thus stopped. The cam 73 makes one turn to each two strokes (forward and return) of the bed.

ln the modification of my invention shown in Figs. 6 and 7, the cylinders C, F, and D, and bed T, are arranged as hereinbefore described. The cylinder C, the mutilated gear 3l, the sliding segment of a gear 33, and the rack 32 are placed relatively to each other as in the modification just described. The sliding segment 33a is guided by suitable lugs as shown, and has an elongated slot for the shaft of cylinder C for the purposes above noted. The segment 332L is moved and held inward by a spring 77, on the cylinder, acting under a lug 78 on the plate 60 carrying the segment, when the pla te is not otherwise influenced. The plate 60 carries the roller 63 on a stud as before.

It will be noted that the plate 60 is dished or cut out in its outer face. This allows the spring 77 and lug 78 to be within the outer face of the plate, so that they in no wise interfere with the plate having the cam 79. This plate having the cam 79 is loosely hung 0n shaft S, and when turned to the left from the position shown, the cam pushes the roller 63, and segment 33tl outward and causes the segment to mesh with the rack 32 and start the cylinder C. The cam 79 has asegmental gear 8O rigid with its sleeve or plate by which it is hung on shaft S. A gear segment 8l on arm 82,pivoted at 83 to the frame, meshes with segmental gear 80. The arm 82 is lifted by the rod 84, pivoted to it, and by the cam 85 on shaft 86. The cam 85 engages with a roller 87 on rod 84 to move the same. The rod 84 is forked and straddles shaft 86, and is held close to cam 85 by the collar 88, held in place by a set screw. The weight of the parts 82, 84, &c., causes them to move down when the cam 85 permits of it, and this turns the cam 79, through the described gearing, to the left in Fig. 6. Or the cam 85 may be of such form that it will move the rod both up and down. In turning to the left, the cam 79 forces plate 60 down, causing segment 33a to mesh with rack 32 and start cylinder C. When the plate 60 and segment 33a are moved down to complete the circle of gear 3l, a spring pressed latch 89, sliding in a lug on the cylinder, moves inward and engages with a shoulder 90 on the plate and holds it in its outward position, relatively to the gear 31, until the cylinder has made two revolutions. The segment 332L is thus caused to mesh with the middle portion of rack 32. When the cylinder has about completed its two revolutions, the latch`89 is withdrawn; the plate 60 is then moved inward by the spring 77. The latch is withdrawn by means of a pin 91 thereon and a rocking lever 92; the lever has a lug on its side that engages the pin and pulls it out against the force of the spring 93, until the latch is clear of the shoulder 90, when the lever 92 stops. When the cylinder C starts to move, the pin rolls downward, clears the lug on the lever, and the spring forces the latch inward as described. The lever 92 is moved into the position shown in dotted lines before the latch gets around the second time. The spring 93 surrounds latch 89 and abuts against its enlarged head and against the lug through which the latch passes. The lever 92 is operated by the rod 94, pivotally connected thereto, and a suitable cam 95 on shaft '86, which engages a roller 96 on rod 94. The

the moment the bed comes to a dead stop to IOO the right. The lever 92 may pull out the latchy by its own Weight and that of the rod 93, or the last may be moved in both directions by a grooved cam engaging with the roller on the rod.

The cams 85 and 95 being of well known forms, I have not deemed it necessary to show them by detail views.

Concerning the devices shown in Figs. 3,4,

5, 6 and 7, it will be noted that the end portionsl of the rack mesh with the mutilated gear 3l and that the middle portion meshes with the segment 33a. In Figs. 8 and 9 is shown means for revolving the cylinder C in one direction. The gear wheel 31a is loose on the shaft S of the cylinder C and meshes with the rack 32 on the bed T. A disk 97, fast on the shaft S, confines the gear 3la between itself and the end of the cylinder C. There is a circular groove 98 in the face of the wheel 31a next the disk 97 said groove having a single tooth 99 o n its outer wall. A pawl 100 on the disk 97 lies in the groove 98 and is pressed against the outer wall thereof by a spring 101, and is engaged by the tooth as the gear turns in the dlrection indicated by the arrow. The operation of these devices is as follows (itbeing understood that the cylinders C, F, D, bed, forms, &c., are as above described): As the bedmoves on its forward stroke it turns the cylinder through the gear 31a, its tooth 99, the pawl 100, the disk 97, and the shaft S. On the return stroke, the cylinder C is at rest, the pawl riding up the inclined back of the tooth as the latter moves around, until the pawl engages as shown at the end of the second turn of the gear Sla. The positions of thepawl 100 and tooth 99 may be inverted if desired, in which case each would point just opposite to what it now does.

It will be understood that the ductor rolls of the ink and water fountains are moved by the usual means and inthe usual manner.

It is obvious that the sliding plate 66 may be operated by a system of levers, links, and a crank, without departing from my invention. For instance, the link or lever 70 can be replaced by a bell crank lever, and the latter be connected to a crank by a rod. Or it may be operated by an eccentric or cam on shaft S.

The sheets may be fed to the impression cylinder C by other devices than those shown, as by hand from a feed board; or feed tapes may be used; and the sheet may be delivered by other means than those shown, such as throw offs, guides and tapes; all without departing from my invention.

The grippers of cylinder F, instead of operating as described, may grasp the sheet from the feed board while the cylinder F is at rest, and remain closed during the first revolution and until they meet the grippers of the impression cylinder on the second revolution, when they open and the grippers of the cylinder C grasp the sheet, as hereinbefore set forth.

Sometimes it may be desirable to dampen the stone 1l after it has been inked and before the impression so as to prevent more effectually the ink already on the once printed sheet from adhering to the stone of the second color.

If the cylinder C were larger and the bed 'l had more throw the ink rolls would not require to be raised and lowered, since the forms would be farther apart, the inking rolls could be placed farther away from the cylinder C, and the wetting devices could be placed outside the inking rolls.

' The water rolls 20 dampen the form 10 before it is inked and may be lifted from its path as the bed moves to the left in Fig. 1, so as not to dampen that form after it isinked.

Although l have described the feed and impression cylinders as stop cylinders, it is evident that in certain'of its branchesmy invention is not limited to stop cylinders. The impression cylinder taking two impressions on the same sheet from dilferent forms may rotate continuouslyand be lifted on the r'eturn stroke of the bed, and the wetting devices described be used therewith. Nor is it necessary to my invention that thevfeed cylinder be of the same size as the impression cylinder.

lt will be observed that the distance 'from the point where the grippers 27 of the cylinder C grasp the leading edge of the sheet when the cylinder is at rest back around said cylinder and the cylinder F to where the grippers 48 take the sheet from the feed board is equal to the length of the stroke of the bed, in the construction shown.

Many changes may be made in the details of the various parts, their relative sizes, and so on, without departing from my invention.

Having thus fully described my invention, what I desire to secure by Letters Patent isl. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylinder, a segment of a gear thereon, and a rack portion at the middle portion of one side ofthe bed to mesh with the said gear segment to continue the rotation of the cylinder at that point, one of saidsegmental gear and rack portion parts being movable, and being in its operative position during the forward stroke (or a part thereof) of the bed, and in its inoperative position during Athe return stroke of the bed, substantially as described.

2. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylinder, a movable segment of a gear thereon, a rack portion on the bed at the middle section thereof, and cam-controlled mechanism operating the said movable segmental gear, substantially as and for the purposes described. l

IOO

3. In a printing machine, thecombination ef a reciprocating type bed, a two revolution impression stop cylinder, a movable segment .of a gear thereon, a rack portion on the bed at the middle section thereof, a cam on a shaft on the framework, a movable plate,and connections therefrom to the segmental gear and the cam, whereby the segmental gearis moved, substantially as and for the purposes described.

4. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylinder, a movable segment of a gear thereon, a rack portion on the bed at the middle section thereof, a cam on ashaft on the framework, a sliding plate, and connections therefrom to the cam and the segmental gear, whereby the last is moved, substantially as and for the purposes described.

5. In a printing machine, the combination of a reciprocating type bed, a two revolution impression. stop cylinder, a mutilated gear thereon, the mutilated portion of the gear being opposite the bed when the cylinder is at rest and when it has made one revolution, end rack portions on the bed to mesh with the mutilated gear, and mechanism substantially as described continuing the rotation of the cylinder when the bed is in and near the middle of its forward stroke, substantially as described.

6. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylindelgasegment of a gear thereon, a rack portion on the bed at the middle section thereof, a cam on a shaft on the framework, a sliding plate having a circular groove, a roller on the segmental'gear engaging the groove, and a rod pivoted to the plate and engaging the cam, substantially as and for the purposes described.

7. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylinder, a segment of a gear and a mutilated gear thereon, the mutilated portion of the gear being opposite the bedv when the cylinder is at rest and has made one revolution, end rack portions on the bed to mesh with the mutilated gear, and a rack portion at the middle section of the bed to mesh with the said gear segment to continue the rotation of the cylinder at that point on the forward stroke only of the bed, one of said gear Segment and middle rack portion parts being movable into and out of its operative position, substantially as described.

8. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylinder, a segment of a gear and a mutilated gear thereon, the mutilated portion of the gear being opposite the bed when the cylinder is at rest and when it has made one revolution, end rack portions on the bed to mesh with the mutilated gear, a rack portion at the middle section of the bed to mesh with said segment gear to continue the rotation of the cylinder at that point on the forward stroke only of the bed, one of said segment gear and middle rack portion parts being movable, and cam-controlled mechanism formoving the movable part into and out of its operative position.

9. In a printing machine, thecombination of a reciprocating type bed, its rack, a two revolution impression stop cylinder, a movable segment of a gear and a mutilated gear thereon, the mutilated portion of the gear being opwhen it has made one revolution, and camcontrolled mechanism for moving the segment gear into its operative position, substantially as described.

10. Ina printing machine, the combination of a reciprocating type bed, its rack, a two revolution impression stop cylinder, a movable segment of a gear and a mutilated gearthereon, the mutilated portion of the gear being opposite the bed when the cylinder is at rest and when it has made one revolution, a cam on a shaft on the framework, a movable plate, and connections therefrom to the cam and the segmental gear whereby the last is moved into its operative position, substantially as and for the purposes described.

11. In a printing machine, the combination of a reciprocating type bed,its rack,a two revolution impression stop cylinder, a movable segment of a gear and a mutilated gear thereon the mutilated portion of the gear being opposite the bed when the cylinder is at rest and when it has made one revolution, a cam on a shaft on the framework, sliding plate, and connections therefrom to the segmental gear and the cam, whereby the segmental gear is moved into and out of its operative position, substantially as described.

12. In a printing machine, the combination of a reciprocating type bed, its rack, a two revolution impression stop cylinder, a sliding segment of a gear and amutilated gear thereon, the mutilated portion of the gear being' opposite the bed when the cylinder is at rest and when it has made one revolution, a cam on a shaft on the framework, a sliding plate and connections therefrom to the segmental gear and the cam, whereby the segmental gear is moved into and out of its operative position, substantially as and forthe purpose described.

13. In a printing machine, the combination of a reciprocating bed carrying two forms, a set of color rolls for each form, a two revolution impression stop cylinder taking an impression on the same sheet from each form, feed devices, means receiving the sheet from the impression cylinder during the second revolution thereof and delivering the same, and mechanism substantially as described connecting the cylinder and the bed, whereby the cylinder is caused to revolve in one direction and only during the forward stroke of the bed, substantially as described.

14. In a printing machine, the combination of a reciprocating bed carrying two lithographic forms, a set of color rolls anda set of posite the bed when the cylinder is at rest and ICO IOS

water rolls for each form, a two revolution impression stop cylinder taking impressions on the same sheet from each form, feed devices, delivery means receiving the sheet from the cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed and cylinder and rotating the last in one direction and only during the forward stroke of the bed, substantially as and for the purposes described.

15. In a printing machine, the combination of a reciprocating type bed carrying two lithographic forms, a set of color rolls and a set of water rolls for each form, the water rolls for the form giving the second impression being between one set of color rolls and the impression cylinder and wetting it after it is inked and before the impression, a two revolution impression stop cylinder taking impressions on the same sheet from each form, feed devices, delivery means, and mechanism connecting and operating the parts, substantially as described.

16. In a printing machine, the combination of a reciprocating type bed carrying two forms, a set of color rolls for each form, a two revolution impression stop cylinder taking impressions on thesame sheet from each form, a two revolution feed cylinder, delivery means receiving the sheet from the impression cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed-and impression cylinder, and rotating the last in one direction and only during the forward stroke of the bed, substantially as and for the purposes described.

17. In a printing machine, the combinationof a reciprocating type bed carrying two forms, a set of color rolls for each form, a two revolution impression stop cylinder taking impressions from each form on the same sheet, feed devices, a three revolution delivery cylinder receiving the sheet from the impression cylinder during the second revolution there-a of, and mechanism substantially as described, connecting the bed and impression cylinder, and rotating the last in one direction and only during the forward stroke of the bed, substantially as and for the purposes described.

18. In a printing machine, the combination of a reciprocating type bed carrying .two forms,a set of color rolls for each form,a two revolution impression stop cylinder taking impressions from each form on the same sheet, a two revolution feed cylinder, a three revolution delivery cylinder receiving the sheet from the impression cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed and impression cylinder and rotating the last in one direction and onlyduring the forward stroke of the bed, substantially as and for the purposes described.

19. In a printing machine, the combination of areciprocating type bed carrying two lithographic forms,a set of color rolls and a set of water rolls for each form the water rolls for ing the forward stroke of the bed, substantially as described.

z 20. In a printing machine, the combination o f a reciprocating type bed carrying two lithographic forms,a set of color rolls and a set of water rolls for each form, the water rolls for the form giving the second impression being between yone set of color rolls and the impression cylinder and wetting it after it is inked and before the impression, a two revolution impression stop cylinder taking impressions from each form on the same sheet, feed devices, a three revolution delivery cylinder receiving the sheet from the impression .cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed and impression cylinder and rotating the last in one direction and only during the forward stroke of the bed, substantially as and for the purposes described.

2l. In aprinting machine, the combination of a reciprocating type bed carrying two lithographic forms, a set of color rolls and a set of water rolls for each form, the water rollsfor the-form giving the second impression being between one set of color rolls and the impression cylinder and wetting it after it is inked andv before the impression, a two revolution impression stop cylinder taking -impressions from each form on the same sheet, a two revolution feed cylinder, a three revolution delivery cylinder receiving the sheet from the impression cylinder during the second revolution thereof, and mechanism substantially as described connectingthebedand the impression cylinder and rotating the IIO last in one direction and only during the for- Y ward stroke of the bed, substantially .as-and for the purposes described.

22. In a printing machine, the combination of a reciprocating type bed carrying two lithographic forms, a set of color rolls and a set of water rolls for each form, a two revolution impression stop cylinder taking an impression on the same sheet from each form, a two revolution feed cylinder, delivery means receiving the sheet from the impression cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed and impression cylinder -rotating the last in one direction and only during the forward stroke of the bed, substantially as described.

23. In a printing machine, the combination of areciprocating type bed carrying two lithographic forms, a set of color rolls and a set of water rolls for each form, a two revolution impression stop cylinder taking an impression on the same sheet from each form, feed devices, a three revolution delivery cylinder receiving the sheet from the impression cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed and impression cylinder rotating the last in one direction and only during the forward stroke of the bed, substantially as described.

24:. In a printing machine, the combination of a reciprocating type bed carrying two lithographie forms, a set of color rolls and a set of water rolls for each form, a two revolution impression stop cylinder taking an impression on the same sheet from each form, a two revolution feed cylinder, a three revolution delivery cylinder receiving the sheet from the impression cylinder during the second revolution thereof, and mechanism substantially as described connecting the bed and impression cylinder rotating the last in one direction and only during the forward stroke of the bed, substantially as described.

25. In a printing machine, the combination of a reciprocating type bed, a two revolution impression stop cylinder, a segment of a gear thereon, a rack section at the middle portion of one side of the bed to mesh with said gear segment to continue the rotation of the cylinder at that point on the forward stroke of the bed, one of said segmental gear and rack section parts being movable, and cam-controlled mechanism operating said movable part, substantially as and for the purposes described.

26. In a printing machine, the combination of a reciprocating type bed carrying two lithographic forms, a set of color rolls and a set of water rolls for each form, a two revolution impression stop cylinder taking an impression from each form on the same sheet, feed devices, delivery means, mechanism connecting the bed and the impression cylinder rotating the last in one direction and only during the forward stroke of the bed, and devices substantially as described, for lifting the water rolls for one form from the path of the other form, substantially as and for the purposes described.

27. In a printing machine, the combination of a reciprocating type bed carrying two forms, inking devices, wetting devices for each form and an impression cylinder taking an impression from each form on the saule sheet, the wetting devices for the form giving the second impression being between one set of color rolls and the impression cylinder and wetting the said form before and after it is inked and before the impression, substantially as described.

28. In a printing machine the combination of a reciprocating bed having two forms thereon, an impression cylinder taking an impression on the same sheet from each form, and inking and wetting devices at each side of the cylinder, one of each for each torm, the Wetting devices for the form giving the second impression being between the inkers for that form and the cylinders, substantially as described.

29. In a printing machine, the combination of an impression stop cylinder and a feed stop cylinder, the grippers of the feed cylinder taking the sheet while the cylinder is at rest, substantiallyV as described.

30. In a printing machine, the combination of an impression stop cylinder and a feed stop cylinder, the grippers of the feed cylinder taking the sheet while the cylinder is at rest,

and the grippers of the two cylinders when the latter are at rest being relatively located so that lines drawn from that part of each gripper grasping the sheet through the center of its cylinder intersect on the common tangent to the cylinders, substantially as described.

Signed at New York, in the county of New York and State of New York, this 14th day of March, A. D. 1891.

WALTER SCOTT. Witnesses:

LoUIs F. DoYLE, R. W. BARKLEY.