US2595413A - Curved platen printing press - Google Patents

Description

May 6, 1952 c. F. ROOT CURVED PLATEN PRINTING PRESS 6 Sheets-Shea?I l Filed Dec. 25, 194e May 6, 1952 F. ROOT 2,595,413

CURVED PLATEN PRINTING PRESS Filed Dec. 23, 1946 6 SheebS-Sheel'. 2

May 6, 1952 c. F. RooT CURVED PLATEN PRINTING PRESS 6 SheetsSheet 3 Filed Dec. 25, 1946 C. F. ROOT CURVED PLATEN PRINTING PRESS May 6, 1952 6 Sheets-Sheet v4 Filed Dec. 25, 1946 all! May 6, 1952 c. F. ROOT CURVED PLATEN PRINTING PRESS Filed Dec. 23, 1946 6 Shee's-Sheet 5 May 6, 1952 Filed Dec. 25, 1946 C. F. ROOT CURVED PLATEN PRINTING PRESS 6 Sheets-Sheet 6 fig@ Patented May 6, 1952 CURVED PLATEN PRINTING PRESS Charles F. Root, Cleveland, Ohio, assignor to The Chandler and Price Company, Cleveland, Ohio, a corporation of Ohio Application December 23, 1946, Serial No. 717,986

Claims. (Cl. 101-297) This invention relates in general to platen printing presses and more particularly to a press wherein the platen has a curved convex surface.

There have been many attempts in the past to design a practical job press wherein the platen has a curved printing surface, and the advantages of the curved platen press have long been recognized as clearly set forth, for example, in the Clark Patent No. 1,034,083 which describes in detail the objections inherent in printing on a fiat platen, which objections are overcome by the use of a curved platen. Perhaps the primary advantages of a curved platen over the well known type of press wherein both the platen and the type bed are flat are that less pressure is necessary between the platen and bed during the printing operation because of the progressive line contact therebetween, and the printed sheet is stripped from the type form as it prints,A thus eliminating the stripping difculties present in a at platen press. Especially is this truein the case of printing from large half-tones and the like.

In my copending application, Serial No. 686,383 led `uly 26, 1946, now Patent No. 2,497,798, patented February 14, 1950, I have illustrated a type of press which is known to the trade as a Golding press wherein the curved platen principle is applied by pivoting the platen adjacent one end thereof to an oscillating platen carrier. Also, in my copending application, Serial No. 687,844 led August 2, 1946, now Patent No. 2,497,799, patented February 14, 1950, I have disclosed a form of curved platen principle as applied to the well known Gordon type of press. In the latter case, however, instead of pivoting the platen, I have altered the type bed so that it may swing about a pivotal axis adjacent one end thereof to thus obtain a rolling action between the two impression members for perfect registry or pin-point contact. The term pin-point contact has been utilized in my earlier applications to indicate perfect registry between the two impression members, one of which is curved. The meaning of this term will be obvious since, for perfect registry where no slippage occurs between any two surfaces, one of which is curved and the other of which is flat, it is necessary to provide such a rolling action between the two surfaces which will produce a line contact, but which at any one point may be called a pin-point contact. This has been made possible in these earlier machines by properly positioning the pivotal points of the pivoted impression member and the oscillating frame in a predetermined relation. The invention disclosed herein utilizes an entirely different principle.

The present form of curved platen press is shown as being adapted for use on a platen printing press known as the Gordon type, wherein the platen is mounted on a stationary frame and the type form is carried by an oscillating frame. The platen is ordinarily mounted to rotate about a xed axis so that it may assume a sheet receiving position, which is substantially horizontal when the two frames are separated, while the inking rollers are inking the type form. As the frame on which the type bed is mounted oscillates and moves toward the platen, the platen rotates downwardly and is held in a fixed position during the impression period.

An early attempt waslmade to provide a Gordon press with a curved platen as evidenced by the patent to Waters No. 1,360,063. It was found in actual practice, however, that these earlier machines, such as those illustrated in both the Clark and Waters patents were cumbersome, unwieldy and totally unsuited for commercial use. To the best of my knowledge a practical curved platen job press has never been commermercially made or used.

One of the advantages of the present invention is the ease with which a conventional Gordon press may be modified to transform it into a curved platen press. A curved platen may be substituted for the conventional at platenwand any suitable means may be provided whereby the carrier, or oscillating frame, for the type bed and type form may be caused to roll upwardly against the curved platen during the printing operation.

One of the-principal objects of the present invention is to provide a platen printing press wherein the platen member has a curved surface thereon of convex form and the type form is rigidly mounted on a frame which oscillates in such a way as to cause a rolling action to occur between the two impression members during the printing operation.

Another object of the invention is to provide a platen printing press of the Gordon type wherein the platen, which rotates about a fixed axis, has a curved convex surface thereon and the oscillating frame carrying the type form is caused to roll the type form against the platen in such a way as to obtain perfect registry between the two impression members.

A further object of the invention is to provide a platen printing press having a main stationary frame on which is mounted a curved platen to 'rotate about a fixed axis, and an oscillating frame carrying the type forni, wherein means are provided to move the oscillating frame in such a way as to cause the type form carried thereby to have a perfect rolling action against the curved platen during the printing operation.

Still another and more specific object is to provide a platenpi'inting press wherein an oscillating frame carrying a, type form oscillates about a pivotal point on a stationary frame, which frame carries a rotatably mounted curved platen adapted to remain in fixed position during the impression period, and means are provided to move the oscillating frame and its pivotal point during the printing operation in such a way as to roll the type form against the fixed curved platen and thus obtain perfect registry.

A still further object is to provide a platen printing press wherein an oscillating frame carrying a type form oscillates about a pivotal point on a stationary frame carrying a rotatably mounted curved platen, andmeans are provided to move the oscillating frame .and its pivotal point through an arc during the printingoperation whereby the type form is rolledagainst the platen toobtain perfect registry.

v Still another and more specific object is to alter the present construction of a .conventional Gordon type printing press by substituting a curved platen for the customary flat platen and mounting the oscillating frame carrying the type form for bodily movement through-an arcuate path during the printing operation to thereby roll the type form .against the curved-platen and obtain. perfect registry.

Still another object isrto provide a novelform of throw-off `meansforpreventingimpression betweenthe-twoiinpression members which isparticularly adapted for use in conjunction with the construction of thecurved platen pressrof the present invention.

Other objects and advantages of the invention willvbecome apparentby reading the following description taken invconnection with the accompanying drawings in which: f

Fig. l is a side elevational-view, partly-insection, showing the position ofthe impression members at the Ybeginning of the printingoperation;

Fig. 2 is a side eievational view, partly in section,v showing the impression members `in their position atlthe end of theprinting operation;

Fig. 3 is a side elevational view, partly insection, showing -the platenand type bed separated where theplaten is in sheet receiving position;

Fig. 4 is a front elevational view of the machine;

Fig. 5 is a fragmentary vertical section taken substantially along the plane of line 5 5 of Fig. l;

Fig. 6 is a side elevational view, partly in section, of a modified form of the invention;

Fig. 7 is a fragmentary front elevational view taken substantially along the plane of line l-'I of Fig. 6;

Fig. 8 is a side elevational view of the machine illustrating primarily the throw-off mechanism for preventing impression wherein the full line position of the various parts indicates on-impression and the dotted line position indicates offimpression; and

Fig. 9 is a fragmentary side elevational view of the linkage mechanism shown in Fig. 8 but showing the lower part of the oscillating frame and the throw-off mechanism in the position which it assumes at the end of the printing operation.

Briefly described, the invention contemplates the use of a curved platen substituted for the flat platen of a Gordon press. In this type of press the platen is held rigid during the impression period, and for perfect registry between the platen and type form, I provide suitable mechanism for moving the oscillating type form carrier bodily in an arcuate path so that the ilat type form will have a perfect rolling action against the curved platen. To aid inthis movement of the type form carrier, I position the pivotal points at the lower ends of its two legs in an arcuate slot and cause this pivotal point to traverse the slot in one direction during the impression period, which will then cause the type 4form to rollagainst the curved platen, all as will be more clearly understood hereinafter during the detailed description of the parts.

Referring now more particularly to the drawings, the conventional Gordon type of platen printing press is so well known in the art that it will be sufficient to describe its operation yin a general way. The press is composed of a stationary. frame, generally indicated by the Vriumeral I, which hasspaced apart side frame members 2 and 3 and which may, if desired, be provided'with an enclosing apron 4 at the front side thereof (see Fig. 4). The oscillating -type form carrier vincludes spaced downwardly extending legs 5 and 6 at each side of the stationary frame I which have a shaft 1 extending therebetween and which constitutes a supporting pivotal point therefor. The main upper portion of this oscillating frame member is indicated lby the numeral S and is adapted to carry a type form which is not specifically shown in the drawings but, for present purposes, may, be considered as being substantially in the plane of the forward side 9 of the carrier.

The platen 'I0 is mounted on and secured to a rock .shaft II extending between the sides of the main frame which is'caused to rock or.have a rotary reciprocating motion by'means of a cam follower I2 carried at the end of a rocker arm I3 secured to the shaft II. The cam follower I2 is located in a cam groove I4 on the inner side of a gear I5 mounted 'on the shaft I6. When thegear I5 rotates, the cam groove vrI4 is of such configuration as to cause the'shaftll to rotate and the platen I0 to move from its position shown in Fig. 1 tothe open position for sheet receiving purposes shown in Fig. 3. The platen is locked against movement in onedirection in its impression position by 4means of a rocker extension II integral with that portion of the platenA surrounding the shaft II and which extendsforwardly,'terminating in a ledge I8 in cooperation with a rocker lock I9. This rocker lock kis ladapted to -be -positioned beneath Vthe ledge `I8 during the impression period and to ,be moved out-of the path of ythe rocker extension atftheend of theimpression period toppermit the platen-to be moved to sheet receiving position. The-rocker lock I 9 in the present instance is suitablyv mounted for rocking movement about a stud shaft I9a-at each side of themachine. Movement of the platen in the other direction is prevented during impression byhaving the top of the ledgelV abutA against any suitable stationary -part of the frame, ysuch as the inwardly Iextending abutments 2|J.

vThe movement of the oscillating frametoward and away from the platen on the stationary frame is -caused by means of the sidearmsZI, one ofwhich is-pivotallyconnected atits forward vend to a` stud;22 on the louter side of the 'gear I5, and the other of which is connected at its forward end in a similar manner by means of a stud 23 on the outer side of the small head 24 (see Fig. 4). The other ends of the side arms 2I are mounted on eccentric studs 25 on each end of the shaft 26. The eccentric mounting is for the purpose of throwing off the impression as will be more clearly described hereinafter. It will be evident that rotation of the gear I5 and the small head 24, both of which are mounted on the shaft I6, will cause a recoprocating movement of the side arms 2| and thus oscillate the frame 8 carrying the type form. The usual and customary inking means may beemployed in connection with the present invention by means of which the type form is inked during each open period of the oscillating frame. Briefly, this constitutes a plurality of inking rollers 21 adapted to roll over the inking disc 21a, which rollers are carried by the inking frame 28 mounted for pivotal movement on the shaft 26. A link 29 at one side of the machine is pivotally mounted at its rear end to the inking frame 28 as indicated at 3U, while its forward end is pivotally mounted as at 3| to the stationary frame. Thus it will be evident that as the oscillating frame moves away from the platen on the stationary frame, the link 29 will cause the inking frame 28 to rotate in a clockwise direction carrying the rollers 2l downwardly over the type form. As the oscillating frame then moves toward the platen the link 29 will rotate the frame 28 in a counter-clockwise direction and carry the rollers 21 upwardly across the disc 27a to a suitable inking fountain (not shown). All of this construction is conventional in a Gordon type of press and forms no part of the present invention.

The various motions of the press are imparted through the rotation of a main drive shaft 32 which extends between the sides 2 and 3 of the stationary frame. Suitable tight and loose pulley's 33 may be mounted at one end of the shaft 32 and may be driven by any suitable means such as an electric motor (not shown). Also adjacent one end of the shaft 32 there is keyed a pinion 34 adapted to be in mesh with the gear I5,` thus actuation of the motor to rotate the shaft 32 through the tight pulley 33 will cause a rotation of the gear I5 through the pinion 34. This rotation of the gear I5 will not only cause the oscillating frame to be moved by actuation of Athe side arms 2I, but will also rock the platen I through the rocker arm I3 and cam groove I4 above described.

The oscillation of the rocker lock I9 to its locking and unlocking positions is caused by means of an extension 35 (see Fig. 4) extending outwardly from one side of the rocker lock and the outer end of which carries a cam follower 36 adapted to ride against the periphery of a cam 37 mounted on the shaft I 6. Since the gear I is keyed to the shaft I6, rotation thereof by means of the pinion 34 will impart a rotary movement to the shaft I6 which carries the cam 31. Springs (not shown) are usually provided to maintain the cam follower 36 in contact with the cam 3l. The periphery of the cam 3l is such that at the proper moment, when the rocker extension I1 is in its position as shown in Fig. 1, it will permit movement, by the springs, of the rocker lock I9 to a position beneath the ledge I8 for securely locking it against downward movement and against the abutments 20. Immediately after the impression has been completed, the

rocker lock I9 is caused to move outwardly and thus permit the rocker extension I'I to be rotated downwardly and carry the platen upwardly to sheet receiving position. l

The present invention contemplates the use of a platen having 'a curved convex impression surface substantially as indicated by' the numeral 38. While this surface may .be of any desired radius of curvature which will be suitable for use in any particular size of printing press, this radius is not an important consideration here, although it may be mentioned that in actual practice a 51/2 foot radius has been found to be satisfactory. f

The essence of this invention lies in the fact that the curved platen is locked and remains rigid during the impression period and the type form, being axed to the oscillating frame, will be caused to roll upwardly against the curved surface of the platen during the impression period. Inasmuch as the type form is a rigid part of the oscillating frame, suitable means must be provided to roll the entire frame bodily in such a manner as to cause the type form to be propverly rolled against the curved surface of the platen for perfect registry therewith during the impression period.

Perhaps the most satisfactory Way in which the oscillating frame may be bodily rolled against the curved platen involves the use of an arcu-V ate slot 39 located in each side member of the stationary frame, which slot may be traversed by the shaft 1 on which the oscillating frame pivots. The length of this slot is not an important consideration because the movement of the shaft I therein is controlled by means of a suitable cam 43 having a cam track 4I therein (preferably closed) which is keyed to a transversely extending shaft 42 at the forward side of the machine. In actual practice, the pivotal point of the oscillating frame, which is the shaft 1, is in a direct line with the face ofthe type form, which line in Fig. 1 is indicated by the letter A, although this may not be essential. If a predetermined length is given to the arcuate slot 39, then the center of such slot should be coincident with a tangential plane at the high point or crown of the curved surface 38. This point is indicated in Fig. 1 by means of the line B which extends tangent to the high point or crown of the curved. surface 38 of the platen.

It will be evident that for a perfect impression, the type form should have a perfect rolling action against the curved platen without any slip-- page occurring between the two impression surfaces. During the impression period, the type bed should start at one end of the curved surface 38 and finish the printing operation when it reaches the other end of the curved surface. To do this, the movement of the shaft 1 on which i the frame 8 oscillates should begin a predetermined distance on one side of the center of the slot 39 and move in a perfect arc to a point which is equidistant on the other side of the center of the slot. As stated above, however, for practical purposes, either end of the slot 39 could be open since the distance the shaft 'I is moved in either direction is controlled by the cam 40 and it will thus be prevented from going beyond a predetermined point in the slot by being so controlled.

The shaft 42 carrying the cam 4B is caused to rotate by means of a gear 43 keyed to the shaft 42 which is in mesh with an idler gear 44 mounted on the shaft 45 also in mesh with the gear I5. Thus it will be clear that the main drive shaft 32 vthrough the rgear vtrain y34, |5, 44 and 43 will cause a rotation of the cam 4|lfin properly timed relation with the other movements of the press. The cam slot 4| is adapted to receive a cam follower 46 mounted on one -end of an arm 41 integral with the reciprocating gate or casting 48 extending -transversely of Ythe machine (see Fig. 4). The casting 48 is'mounted for pivotal or rocking movement on the shaft 49 andveach end thereof carries a pivot pin U to which is secured a rearwardly extending link 5| pivoted at its other end by means of the'pin'52 to a substantially vertically extending link 53. This phase of the construction will become more evident vupon viewing Fig. 5. Each -link 53 is pivotally mounted at its upper end by means of a pivot pin 54 extendinginwardly from each of the side members 2 and.3 of the mainstationary frame. The lower end Vof each link 53 ymay preferably be provided with a slot 55 for reception of the shaft 1. gAs the shaft is caused to move traversing the slot 39, there will be a slight movement thereof vwith respect to the links 53 which will be permitted by means of the slots 55.

While it might be possible to form an operative device by connecting the casting 48 directly with the shaft 'i in order to cause the shaft to traverse the slot 39, it is also evident that such a construction would be unwieldy and impractical because of the large size of the cam which would be necessary to cause the shaft 'i to move the required distance. The construction of the form shown in Fig. l is such that the cam may be made relatively small and the movement of link 5| will be multiplied through the medium of the pivoted member 53. If member 53 could be pivoted at the center of curvature of the arcuate slot '39, it would permit connection of its lower end with the shaft by means of a circular opening. Due to the structure and operation of the machine, however, the member 53 cannot be so pivoted but must be mounted on the frame in such a way that its lower end moves in an arc which is of a different radius from that of the arcuate slot 39. For this reason, the opening or slot 55 in the lower end of the member 53 must be elongated t0 permit shaft to move relative to member 53 and at least partially traverse slot 55, as shown.

The various parts just described will be in theirrespective positions as shown in Fig. l at the beginning of the printing operation where the type form` will be tangent with the lower part of the curved surface 38 on the platen l0. The cam follower 46 is about to be moved toward the left as it approaches the high point of the cam groove 4|. This movement must take place quickly and during such movement the links 5| and 53 will also be moved toward the left forcing the shaft to traverse the slot 39 in a rearward direction. This movement of the shaft 'I will cause the oscillating frame in its entirety, as well as the type form affixed thereto, to roll against the curved surface 38 of the platen during the impression period to the position shown inFig. 2.

It is important to note that the various parts are so arranged that the pivot pins 22 and 23 of the side arms 2| are a predetermined distance above dead center with respect to the shaft I6 at the beginning of the impression period and will be moved to the same distance below dead center at the end ofthe impression period. The absolute dead center of these pivot pins will occur at the time the shaft is in tlie center ofthe slot 39, or when the line A is coincident with the line B, at which time the type form will be tangent tothe curved platen at the center or high point thereof. This is animportant consideration from1the standpoint of equalizing the pressure between the two printing surfaces during the-entireprinting operation. The pressure is obtained Aby means of the side arms 2| which lmove the oscillating frame against the platen.- yWhen the pivot points 22 and 23 are above-dead center and the two impression surfaces are in contact, the pressure therebetween will be against 'the lower part of the curved platen. This pressure will remain constant throughout the impression period, first because of the movement of these pivotal points across dead center and second because of the simultaneous movement of the shaft 1 to a point-which is the same distance on the opposite side of the center of the slot 39. At this point the pressure will be the same against the upper part of the curved platen -as itV was previously against the lower part thereof. Thus this construction affords .a simple means of obtaining a perfect rolling action between the two impression surfaces and assures a constant pressure therebetween during the impression period.

From the position of the parts as shown in Fig. 2 at the end of the `impression period, the oscillating frame will begin its movement away from the platen by reason of the pivotal. points 22 and.23 moving in a clockwise direction. As soon as the oscillating frame starts its separating movement, the curved platen will begin to rotate about the shaft to its sheet receiving position. During this time and during the time that the type form is .being inked, the shaft 'i upon which the oscillating frame is pivoted must be caused to return to its original position at the bottom of the slot 39. This movement, however, need not occur at any particularrate of speed as long as the shaft returns by the time the two impression surfaces are ready to begin the next printing operation. The cam groove 4|, as illustrated, is so designed as to bring the shaft 'i back to its starting point at a comparatively slow rate of speed, but this rate may be varied within wide limits as long as the starting point of the shaft is reached before the next printing ,operation begins. If it is desired that the apron 4 be incorporated at the front of the machine, as shown in Fig. 4, then a suitable opening 56 may be Vprovided therein to permit the cam 40 to rotate without interference.

Figs. 6 and 7 of the drawings illustrate a modified form of the invention which, while operating on the same principle ,to move the oscillating frame bodily for rolling contact between the two impression surfaces, nevertheless embodies desirable features in that fewer parts are necessary. In Fig. 6 the machine is substantially identical with that shown in Fig. l with the exception of the modied parts. In this case the cam 45 on the `shaft 42 is provided with a similar cam groove 4|, but the casting 5l which carries the cam follower 53 in the cam groove 4i is provided with a pair of upwardlyextending side members or arms 59 mounted for pivotal movement on the shaft '69. The lower end of the casting 5? is provided with a shaft 6| adjacent the ends of which rearwardly extending links 62 are mounted for pivotal movement. The rear ends of the links B2 are mounted directly on the shaft 7 which provides the pivotal point for the oscillating frame.

It will thus be evident that the operation of 9 this modified form accomplishes the same result, by the rotation of the cam causing the shaft 6i carried by the casting to move toward the left during the impression period. This movement toward the left will be imparted to the shaft 1 through the links 62 thus moving the shaft and the oscillating frame carried thereby in such a way as to cause it to traverse the slot 39 and roll the type form against the curved surface 38 of the platen.

Reference will now be made to Figs. 8 and 9 which disclose a novel form of throw-onc device which is particularly adapted for use in connection with the invention as described above.

Throw-off devices for platen printing presses to;

enable the operator to prevent impression between the two impression members are in general usage on conventional Gordon presses. The present invention, however, by utilizing the bodily movement of the oscillating member to obtain a perfect rolling action against the curved surface of the platen, does not permit the use of the conventional throw-off devices. It has, therefore, become necessary to devise a novel throw-01T mechanism adapted for use in connec-` tion with this invention.

In order that the operation of this device may be more clearly understood, Fig. 8 discloses a side elevational view of a Gordon press embodying the present invention, but without showing the actuating means such as the cam and the links connected thereto for moving the shaft 1. It is customary for a lever arm E3 to be positioned at one side of the machine, which arm is pivoted between its ends on a pivot pin 64. Suitable means must be provided between this lever arm 63 and the shaft 26 to rotate the shaft and the eccentrics 25 in order to move the oscillating frame and its type form a short distance away from the platen when the two impression members are in printing position.

In the present form of this device a suitable holding member 65 is located at one side of the machine and carries a pair of detents 6G adapted to receive a spring pressed ball on the inner side of the lever 63. In this way the lever is easily held in each of its extreme positions and yet may also be easily disengaged from each detent for movement from one position to the other. The lower end of the lever 63 which extends below the pivotal point E4 has a forwardly extending link 61 pivoted thereto at 68, while its rear end is pivoted at 59 to an upwardly eX- tending portion 10 of an arm 'H forming a bell crank. The arm 'll is pivoted to the side of the frame by means of a pivot pin 'i2 whereby' the arm 'H may be rotated from its full line position to its dotted line position shown in Fig. 8.

The rear end of the arm 'il is provided with a pin or roller 13 which is adapted to be received within and traverse a slot 14 located in the forward end of an arm T5. This arm l5 is mounted for rotation on the outer end of the shaft 'I and therefore will be carried with this shaft as it moves within the slot 39 during the impression period. The opposite end of the arm 'i5 is pivotally connected to an upwardly extending link T6 which, at its upper end, is connected at 'l1 to an arm 'i8 on the end oi the shaft 26.

The full line position of these various parts shown in Fig. 8 indicates the on-impression position thereof. When it is desired to utilize the throw-off to prevent impression, the lever S3 will be moved toward the left to its dotted line position at which time the link 61 will cause a clocki wise rotation of the arm 'Il which in turn will cause the rear end of the arm 75 to move downwardly and rotate the arm 'I8 in a counterclockwise direction and thus rotate the shaft 2B carrying eccentric stud 25 to move the oscillating frame to its dotted line position. The arrangement of these parts is such that the throwoff may be actuated at any time during operation of the machine and regardless of the position of the platen and the oscillating frame with respect to each other.

Fig. 9 is a fragmentary view of the lower part of the linkage mechanism indicating the position of the throw-off at the end of the printing operation where the shaft 'I has traversed the slot 39 and is on the left side of its center. During this movement the arm 15 will not have been actuated because of its slot 74 permitting free movement thereof independently of the arm 1|. The actuation and rotation of the eccentric shaft 26 is caused by rotation of the arm 1I, but since the pin '13 is carried thereby and is permitted to traverse the slot 1li during the impression period, the movement of the shaft 'l may carry the arm 15 with it but will not disturb the position of the arm il or the eccentric shaft 26. It will thus be observed that a novel linkage mechanism has been devised for throwing-off impression which is particularly adapted for use in connection with a curved platen printing press disclosed herein.

While the drawings and description herein have made particular reference to a printing press wherein a type form is mounted in a type bed, it is generally well known in the art that printing presses of this type are also used for other operations such as cutting, creasing and embossing. In the cutting and creasing use of the machine, cutting edges are substituted for the type form, but they are, nevertheless, held by the type bed. It will therefore be understood as far as the claims are concerned, that the term printing press is used in its broader sense of including the use of the press for work other than printing. It will further be understood that the term type form is intended to be used to mean any work form which may be mounted on the type bed for performing work other than printing, such as cutting, creasing and embossing.

`Still further, it is to be understood that the term type form is also intended to include other types'of printing members, such as planograph or lithograph plates.

lFrom the foregoing description it will be evident that I have provided novel means for 0btaining perfect registry in a curved platen job printing press wherein the entire oscillating frame is caused to move bodily to roll the type form affixed thereto against the curved platen. It will be understood that numerous changes may be made in the form, construction and arrangement of parts from that disclosed herein. without in any way departing from the spirit of the invention or sacricing any of the attendant advantages hereof, provided, however, that such changes fall within the scope of the claims appended hereto.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. A platen printing press comprising a main stationary frame and an roscillating .frame pivotally mounted' on said lstationary' frame, means for moving saidl oscillating framefab'outja. pivotal peint toward and" :away from said stationary frame for impression purposes, a curved platen mounted on one of said frames, a type bed mounted on the other of .said frames, guide means on said stationary frame to guidingly receive the pivotal point of said oscillating frame permitting said pivotal point to be moved through a predetermined arcuate path during the impression period, and other means including a lever pvotally secured to said stationary frame and having an elongated recessed portion therein loosely receiving said pivotal point and an arm pvotally connected to said lever above the pivotal point of said oscillating frame to move said pivotal point along said arcuate path, said pivotal point having a limited extent of movement in.

said elongated recessed portion during movement of said pivotal point along said arcuate path, and means to assure engagement of said pivotal point with said recessed portion, whereby a type form on said type bed will roll against the curvedI surface of said platen in registry therewith.

2. A platen printing press comprising a main stationary frame and an oscillating frame pivotally mounted on said stationary frame, means for moving said oscillating frame about a pivotal..

point toward and away from said stationary frame for impression purposes, a curved platen mounted for oscillation on said stationary frame, means for rocking said platen to sheet receiving and to printing positions, a type bed iixed on said oscillating frame, guide means on said stationary frame to guidingly receive the pivotal point of said oscillating frame permitting said pivotal point to be moved through a predetermined arcuate path during the impression period, and other means including a lever pvotally secured to said stationary frame and having an elongated recessed portion therein loosely receiving said pivotal point and an arm pvotally connected to said lever above the pivotal point of said oscillating frame to move said pivotal point along said arcuate path, said pivotal-point having a limited extent of movement in said elongated recessed portion during movement of said pivotal point along said arcuate path, and means to assure engagement of said pivotal point with said recessed portion, whereby a type form on said type bed will roll against the curved surface of said platen in registry therewith.

3. A platen printing press comprising a main stationary frame and an oscillating frame pivotally mounted on said stationary frame, means for moving said oscillating frame about a pivotal point toward and away from said stationary frame for impression purposes, a curved platen mounted for oscillation about a xed axis. on said stationary frame, means for rocking said platen about said xed axis to sheet receiving and to printing positions, means to maintain said platen rigid during the impression period, a type bed fixed on said oscillating frame, guide means on said stationary frame to guidingly receive the pivotal point of said oscillating frame permittingsaid pivotal point to be moved through a predetermined arcuate path during the impression period while the platen is held rigid, and other means including a lever pvotally secured to said stationary frame and having an elongated recessed portion therein loosely receiving said pivotal point and an arm pvotally connected to said lever above the pivotal point of said oscillating frame to move said pivotal point along said arcuate path, said pivotalpointhavn ingA a limited extent of, movement in said elon gated, recessed p ortonduring movement of;- said "pression period, a levei1 arm pvotally 12 pivotall point along said arcuate path, and means toassure engagement of said pivotal point with said recessed portion, whereby a type form on said type bed will roll against the curved surface of said platen in registry therewith.

4. A platen printing press comprising a main stationary frame and an oscillating frame pivotally mounted on said static-nary frame, means for moving said oscillating frame about a pivotal point toward and away from said stationary frame for impression purposes, a curved pla f mounted on one of said frames, a type mounted on the other of frames, guide means on said stationary frame to guidingly receive the pivotal point of said scillating frame permitting said pivotal point to l: rioved through apredetermined arcuate path during the impression period, other means including a le pvotally secured to said stationary having an elongated recessefl pf loosely receiving said pivotal pvotally connected to said lever aine and point having a limited extent of r said elongated recessed portion du ment of said pivotal point along path, means to assure engagement of sai point with said recessed portierI e operable during a cycle of t said other means, whereby a type bed will roll against the curi. if said platen in registry therewith.

5. A platen printing press ce stationary frame and an osoillat g fr ally mounted on said stationary frn forl moving said oscillating frame about point toward and away from frame for impression purposes, mounted on one of said fran es slot on said stationary frame ceive the pivotal point of said opermitting said pivotal point 'o b a predetermined arcuate path dur' to said stationary frame and having a` gated closed slot therein loose?.

said arcuate path, said pivotal point limited extent of movement in said e? recessed portion during movement ci point along said arcuate path, and c. l means connected to said lever arm at a pon above said pivotal point and operable l cycle of the press to actuate said lev whereby a type form on said type bed w l rc against the curved surface of said platen in registry therewith.

IS F. R051".

The following references are of record in the file of this patent:

UNITED STATES PATETS

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