US2604017A

US2604017A - Stereotype finishing machine

Info

Publication number: US2604017A
Application number: US629123A
Authority: US
Inventors: Curtis S Crafts; Knell Christopher Verne
Original assignee: GOSS PRINTING PRESS CO Ltd
Current assignee: GOSS PRINTING PRESS Co; GOSS PRINTING PRESS CO Ltd
Priority date: 1945-11-16
Filing date: 1945-11-16
Publication date: 1952-07-22
Anticipated expiration: 1969-07-22
Also published as: GB628134A

Description

July 22, 1952 c. s. CRAFTS' ET AL STEREOTYPE FINISHING MACHINE Filed NOV. 16, 1945 ll Sheets-Sheet l INVENTORS Mflfwl QMA xefl y 22, 1952 c. s. CRAFTS ET AL 2,604,017

STEREOTYEE FINISHING MACHINE Filed Nov. 16, 1945 11 Sheets-Sheet 2 INVENTORS y 1952 c. s. CRAFTS ET AL STEREOTYPE FINISHING MACHINE ll Sheets-Sheet 3 Filed NOV. 16, 1945 2.6 8 qlfw RTTOkHEY July 22, 1952 c. s. CRAFTS ET AL 2,604,017

- STEREOTYPEFINISHING MACHINE Filed Nov. 16, 1945 ll Sheets-Sheet 4 ATTORNEY July 22, 1952 c. s. CRAFTS EI AL STEREOTYPE FINISHING MACHINE 11 Sheets-Sheet 5 Filed NOV. 16, 1945 IN V EN TORS M 7/ M {A 22,1952 c. s. CRAFTS ET AL STEREOTYPE FINISHING MACHINE Filed Nov. 16, 1945 11' Sheets-Sheet 6 July 22, 1952 c. s. CRAFTS ETAL 2,604,017

- STEREOTYPE FINISHING MACHINE Filed Nov. 16, 1945 11 Sheets-Sheet 7 July 22, 1952 c. s. CRAFTS ET AL 2,604,017

STEREOTYPE FINISHING MACHINE I Filed Nov. 16, 1945 11 Sheets-Sheet 8 July 22, 1952 c. s. CRAFTS- ETAL STEREOTYPE FINISHING MACHINE 11 Sheets-Sheet 9 Filed Nov. 16, 1945 IN! 'ENTORS .MM

c. s. CRAFTS ETAL STEREOTYPE FINISHING MACHINE July 22, 1952 Filed Nov. 16, 1945 ll Sheets-Sheet l0 1 in y, W

July 22, 1952 c. s. CRAFTS ETAL 2,604,017

' SITEREOTYPE FINISHING MACHINE Filed Nov. 16, 1945 11 Sheets-Sheet 11 of the .plate and preferably comprise an axially.

movable cutter head or boring tool which is moved through the arch by mean of a power driven screw, cam controlled milling cutters also being 7 provided for cutting the plate hook recesses in the interior of the plate adjacent to its straight edges, as the interior of the plate is surfaced. These recesses are preferably spaced apart axially of the plate and are accurately located with respect to the plate hooks on the plate cylinder. Mounted on the boring head carriage and to either side axially of the cutter bits thereof is a substantially semi-cylindrical plate carrying parti-spherical rollers radially and resiliently actuated into rolling engagement with longitudinal ribs formed on the interior surface of the stereo, in order that the parti-cylindrical surfaces generated on said ribs by the cutters shall be as perfect as possible. r

The finished plate is preferably removed from.

the arch or form in the same direction as it was inserted and a support or saddle is provided just behind the axially movable cutter head so that, on release of the plate from the arch, the plate is lowered onto the support and is moved out of the arch as the-cutter head is screw returned to its original position.

Referring nowin detail to the accompanying drawings which illustrate a typical, illustrative and preferred embodiment of the present invention, there is provided an arch or supporting member having a semi-cylindrical interior face of a diameter and length corresponding to the desired printing surface of the stereotype plate, and of sufficient strength so that it does not yield appreciably as the plate is firmly pressed into it and interiorly surfaced. Arch 20 comprises a heavilyribbed member which is bolted to the upper portions of the main frame 22, and is preferably located substantially midway between the longitudinal ends of the main frame, thereby providing a plate receiving portion at one end of the frame, and a plate delivering portion at the other end ofthe frame onto which the finished plate is delivered. In actual practice, said arch generally has a diameter of from sixteen to twenty inches and an axial length of from fifteen to twenty inches, the interior surface of the arch corresponding accurately to the printing surface of the stereotypes to be finished therein. At the-receiving end A of the plate finishing machine, atthe left as shown in Figure l are provided a pair of spaced plate edge receiving of the machine while

surfaces

25, 26 are mounted for compound vertical and horizontal movement thereon independently of each other as more fully hereinafter described.

Plate supporting surfaces '24, 25 and 25 are. preferably all in a single horizontal plane parallel to the diametral edges of the semi-cylindrical interior surface of the arch 20, so that the arch is uniformly spaced from the upper surface of the plate 23 at both sides thereof. The arch therefore constitutes the reference surface for the operations to be performed on the plate.

The

supports

25, 23 are carried on plate rails 21, 28 slidable in lateral channels 23 formed in blocks 33, 3! which are slidable in vertical guideways 32 mounted on the main frame 22. Plate rails 2'1, 28 have depending portions with finished surfaces 33' engaging fiats formed on the main frame 22. A threaded tie rod 34 ties block 3! to block 35 similarly slidable in guideway 32,

whereby the distance between blocks 3| and 35 may be varied to accommodate stereoplates 23 of varying diameters. Block 30 is resiliently and adjustably connected to block 36 slidable in guideway 32 by means of threaded plunger 31 extending through both blocks and surrounded by coil spring 38 located in a stepped bore in block 30 and bearing upward against the latter and downward against nuts threaded on plunger 31.

Four earns 39 each comprise two

cam tracks

40, 4|. The tracks 40, seen in front elevation in Figure 3, act through rollers 42 journalled in

blocks

35, 35, to raise the blocks upon revolution For simultaneously and equally operating the cams 39, a pair usually being provided at each end of the plate 23, the cams aremounted on shafts 59 which are parallel and suitably journalled above the arch 20 and intergeared. As embodied, each shaft 53 has a gear 5| meshing with a mitre gear 52 on transverse shaft 53 journalled in the frame and provided with an operating lever 54 releasably coupled to the shaft 53 by means of set screw 55, so that a manual movement of the lever 54 can move cams 39 from their lowermost position to their uppermost position.

The two earns 31? connected to blocks 3! and 35 are designed to raise these blocks slightly ahead of

blocks

33, 35, so that as the blocks 3 l 35, carrying support 25 with them, reach the upper limit of their travel,

blocks

33, 33 and support 26 have not yet reached their upper limit, all as clearly shown in Figures 3 and 5. These figures also show that the

supports

25, 26, actuated by the above-describedv mechanism, have acompound motion which is upward and inward without tipping, which is effective to compress plate 23 diametrally as it seats in arch 20 and thereby prevent any wiping action between plate and arch which would damage the printing surface of the dontenipor-aneouslywith the lateralyretractionof support 25, support 26 completes its upward travel and is laterally retracted. Completion of the upward travel of support 26*causesllsifiwvard- 1y successive peripheral-portions of plate -23 to- -seat in=the arch, the contact progressing upward from the right side of Figure 5 to the top of the arch and thence downward. to the left edge which rests on support -26. It is notable that support 25 is positively actuated in its movement, while support 26 is resiliently actuated inits movement by "mechanism which is similar 'to the actuating mechanism of support 25 except ferti e-addition 'jo'f spring 38, which is effective through support "26to press-plate 23 upward and causethe'latter to exert 'circum'ferenti-ally transmitted pressure against the positivelyactuated support 25. The right e'dgeof plate'23 maybe finished in register 'withitsprinting-surface forcolor work orthe like and the above seating and clamping-mechanism' permits the entireplate to beseated in-register with thereg-istered right edge, so that the ffinishing'of the interior and the forming therein 1 of plate hook recesses 'for tension lo'ckup'of the jplate on the printing cylinder may-be done with unprecedented exactness of register. 'quently the right hand edge of-the plate-maybe -referred .to as the registering edge'and the lefthand side as the tensioning edge.

"While the plate is firmly secured iniits position seated'in the arch '20 it may be'interiorly "finished to conform accurately 'tothe cylindrical surface .of the plate cylinder of the printing press on which 'itwill eventually be secured and printed. For this purpose, means axially movaisle of 'the plate are (provided for boring or 'otherwise'fin'ishing the interior cylindrical surface of the plate, and due to the'firm support .Iof' the plate this finishing may 'be'much more .accurate than usual; thereby resulting in a printing plate which will produce impressions of higher quality than. usual.

To carry out .this interior finishing of the ,.plates, means are preferably provided for accurately boring the interior of the plate, such means moving axially of 'theplate as'the boring tool is rapidly revolved.

Figures "16 to 18 show various views of the "plate'as it is placed-on the finishing machine, while Figures 14 and 15 show schematic views of the plate, 'as finished.

' "The finished plate shown in Figures l4 sand "15 comprises asemi-cylindrical member fill'having a printing surface GI and an interior :sur-

face 62 to be seated on and closely conform to -lthe outer surface :of a plate cylinder and when '-so seated to provide :a 'printing :member ofwa predetermined-size and having an accurate cylindrical surface so that the impression thereof "will be of high quality.

'Plate fill 'is provided with 'internalrrecesses v63 "between ribs 64, to lighten :the "plate, these ,ribs and -recesses"being"shown more in 'detailjn the *dev'eloped view, Figure 17. "Plate '69 .is Ealso formed with straight edges 65 of =less thickness than the main 'body of the plate. :Recesses-63 areforme'd over *the entire inner surface, except at the edges, although shown 7 only over :a: por- "tionofthe'sur'face inFigure l7.

Figures leand l5 showtheplate as it is fln-' ished by the machine illustrated (except' thatthe (ribbing is omitted for clarity). "Themterior sur- Lfac'e. of the plate 60"has been surfaced so thatall .of'lthe ribslie'in a'uniform cylindrieal surface Conse- -le1a series of slots 66 closelyad-jacent the straight edges 65. each :slot :having a flat side it! inclined towards the straight edge, the other longitudinal "side B8 -:of the :slot being .l-parti-cylindricaliand terminating in :roundedends .69. V V The means for interiorlyfinishing :thestereotype comprise an axially movable rotaryz'surfacing means, preferably a boringtoolor cutterfor surfacing the plate and axially .movable .acon: 't'rolledim'illing meansfor forming'the longitudinal s'eries 'o'fspaced slots, :both means acting .:on the same-axial :movement .of :the ifinishing ameans. The finishing means :also'iinclude means for radially pressing the. plate against the arch -.-immediately in advance and :tonthe rear of :the cuther means to insure-iaccurate :finishing of :the plate. While .many different :forms of such means may Zbe employed, .we preferably provide the means illustrated and :the .frame .22 aformed "with s'lideways l0 parallel'to eachother-anm horizontally spaced'running .the greater ipartrofthe length of the machine onzwhich the .cuttenmeans are mounted for movement axially of the :plate 23. The cutter or boring means'arecarriedfby a'slidable'fra'me 1.2 havingguides 1.3 whichcooperate-with the slideways l0.

Slidable frame 12 carries a heavy shaft 15 'journalled thereinandat one end :is .provided With-a 'bcaring head 16 driven thereby and having a plurality of boring :bits 11 extending radially therefrom and adjustable to bore :the. plateac- "curately :to the proper diameter; the.shaft 11.5 being accurately; held inalinement WithifthB axis of the arch- 29. Foraccurately holdingthe'plate during the finishing and to exert pressure in: addition to that exerted by vthe supporting

means

25, 26,:axially in advance and just-i-behind the boring tool; the frame I 2-is formed with two sub- 'stantially semi-cylindrical=plateszaBl); A respectivelygsomewhat smaller than the'inter-ior. 0f the plate :23, one at either side ofthe :boringhead 76, each plate carrying a plurality ;of :partispherical-rollers 3|, spaced to contact with axially extending :ribs 64 'on the stereotype, zeach ,of said rollers being yieldably mounted by heavy springs-82 engaging pillowblocksfl-ZA for radial movement'relative to @shaft" (:5 so' that any irregularity in the :surfaceo'f the platec23is smoothed out While the plate is finished. Plate 99A is formed integral-with :frame :12 :and carries :con- "centrically anti-friction bearing 15A of shaft =15, while plate #80 is removably mounted :on :frame lf asbycap screwsBIlB.

The' boring head is preferably. driven :at. high speed so thata fine'finish isv obtained on the interior of the plate. 'For this purpose, motoris mounted at one side .of frame 122 and drives longitudinal shaft 9| by .belt 92 and suitable --pulleys. Means are provided for driving shaft '15 from-shaft 9i, regardless of the axial position of boring head 15. Shaft 9| is formed to receive and drive sli'dably keyed or splined pulley 93 which is slidable on shaft 9! and is moved axially by bracket 94 depending'from frame 12 and movabletherewith. Pulley 93 by'belt '95 drives pulley-.95 on shaft 95 which carries pinion 91, journalled inframe 1-2, and meshing withgear 98 fast to shaft 15 "and enclosed; in housing 99.

Frame 12 isaxially movableiand maybe 'motor driven. Motor llmmountedonframe 22 is belted topulley I50] carried by screw. shaft I92 journalled in ithe .frame :22 and .in -,cooperating threaded engagement :with a threaded sleeve [10.4Tonzframe ;12 ;so that rotation ofshaft J92 andtheinner'surface is formed "with two paral- '75 s-axia-llyymovescthe frame :12 andrits boring head IS and pressure rollers 8I. Motor I90 is re versible and may drive the frame 12 in either axial direction.

Limit switches I05 and H36 are provided in the motor circuit to prevent excessive axial movement of the boring head.

, The milling cutters for milling the plate hook receiving slots in'theinterior surface; of the plate 23 may be driven from the same motor 99 as the boring tool. Gear 98 drives pinions I08 on parallel shafts I09 which are mounted for rotation in and axial movement with frame I2. At its other end eachshaft has a bevel gear H meshing with a 'bevel gear III on the milling cutter shaft I I2 which is driven thereby to drive the milling cutters H3, while shaft H2 may oscillate about. shaft I99 as the milling cutters H3 and chamfer milling cutters II3A on g-the sameshaft and just below them are moved into and out of cutting contact with the plate surface as the slots 65 are formed.

Shaft I I2 is mounted by bearings I I I in a tool mount or housing I I5 which has sleeve-like ends H6 concentric with shaft I09 and is mounted for oscillation by means of bearings H7, H3

seated in frame 72, while shaft I09 is rotatably plate 23 to form the slots 66 therein. It will be noted that'the shafts. I 09 are arranged generally below the associated plate edge. More spe-v cifically, they are located below the plate edge but spaced inwardly toward the. axis of the plate. As a result of such arrangement the pockets milled by the milling cutters may be caused to be undercut as shown, insuring more positive plate lockup.

To control the length of the each of the milling cutters I I3.towards and from the plate as'the cutters are moved axially of the plate. The cutters H3 are mounted for rocking motion by means of the sleeves H6 to provide a collar type of coupling between the housing and frame. The housing H5 is provided with a depending arm I pivotally connected to a slide I2! carrying a cam follower which is guided and controlled bystationary cam I24 fast to frame 22. Follower I22 is a roller mounted on a slide. I2! which is connected to clevis I25 by screw rod I26, clevis I25 being pivoted to arm I20 by pivot pin I21.

Figure 10 shows the cam I25 having a slot forming track I3!) and a return track I3I adapted to control follower roller I22 and thereby the rocking of the milling cutter ,I I3. In its cutting the cutter frame I2 moves forward (downwards of the sheet in Fig. 10), follower I22 is moved laterally to form, for example, four slots, I56 of the required depth and at the desired longitudinal points along the axial length of the plate 23. On reaching the end of the plate, follower I22 displaces switch I32 and enters the end of the cam track, switch I32 being then spring restored to the position shown. On reverse axial movement of the cutting and boring means, follower I22 travels in return track I3I until follower reaches star switch I33 which is rotated as the follower I22 enters the common cam track I35, switch I33 being held against retrograde slots 65 formed in the plate 23, means are provided for rocking movement by means of the detent spring I36, so that follower I22 always enters't-raclt I3fl rather than the return track I3 I. H The pitch of lead screw I62- and the out and speed of cutter bits If! are so related that on one pass of the boring tool the interior of the plate is accurately finished, and simultaneously all of the plate hook recesses 66 are formed in the plate. Thereafter theboring tool and milling. cutters may be idly withdrawn in the opposite axial direction. 7

When the interior of the plate has been fully finished, lever 54 may be returned to its original position dropping the plate to the lowermost position shown in Figure 5 so that it is freeto be removed from the arch and the finishing machine. Means are preferably provided for automatically removing the plate from the arch on the return movement of the cutters, thereby making use of the otherwise idle axial movement thereof. To this end, frame 72 carries an arcuate saddle I46, preferably, mounted on the gear housing 99 and shaped to fit theinterior of the finished plate and at such a height that it, rather than the supporting

ledges

25, 26 will support the plate as the cams 39 return the ledges to their normal inoperative position. The finished plate is thus depositedon the arcuate saddle Ito and when the, axially movable frame I2 is returned to its original position the v.plate is carried with it to its unloading position C.

Suitable conventional switches are provided for:

.Starting, stopping. and reversing motor III!) driving the lead screw to cause the forward and reverse travel of the axially movable frame I2.

Starting and stopping the motor III! for the boring and milling cutters. l v

Energizing signaldevices such as signal lights for indicating that the plate is securely held for finishing, has been finished and that the finishing operation has been completed and the machine is ready to receive another plate.

By properly driving the various parts of the machine it is possible to finish stereotype plates ata rate well in excess of two plates per minute.

a plate, said support providing a reference surface together with means for clamping said plate with a surface of the plate positioned with respect to said reference surface, means for milling axially spaced pockets in the interior surface of said plate adjacent the straight edges thereof, said milling means including a frame mounted for movement parallel to the axis of saidsupport, a driven shaft revolubly mounted in said frame parallel to the axis of said support, a milling cutter and shaftmounted perpendicularly. to

said driven shaft and having a right angle driving connection therewith, a cam track mounted on said machine and having a portion thereof in fixed parallel relation to the axis of said support, and means for coupling said cutter shaft to said cam track for rocking of the cutter bodily about the driven shaft and into milling engage- 9" merit: with-the; plate: upon. axial. movement of said-frame:

2;:In a machine?for-finishing tension lockup. plates, the combinationacomprising a support for.

a: plate, -said-. support. providing a-reference sur- 5 face; togetheitwith means.- for: clamping saidv plate with; a surface of: the? plate: positioned, Withre:- speet .to; said 3 ref erence-surf ace; means for milling axially-spaced pockets inthe interior surface of. said plateadjacent; the? straight edges thereof, It said milling .meansxi-neluding aframe mounted for: movement; parallel. to. the axis of: said sup port, a; driven shaft mounted formovementaxially with said: frame: a 'milling; cutter and shaft. mountedperpendicularlyto said? driven-- shaft: and: having a right angle; driving" connection: there.-- with, and means; including; a cam trackportion and cam. follower portion engaging with: the cam trackiportioxr for'guiding said millingcutter; one: of-vv said portions. being: coupled to said' milling: cutterrshaft and the-other; of: saidfportions being. coupled. to said support; partiofsaid;cam-track portion. being oriented parallelztothe axis of:- said support andupart atian' angle thereto so. thatzthe cutter: is rocked into "engagement with the. interior'surface of. the plateand. then. moved: parallel to the edge thereof iuponr-axialamovement. of said-frame;

3. In a. machine: for; finishing. tension lockup plates, the.combinationcomprisinga support for. aplate, said: support; providing: a: reference J'sur face :together: with meanszfor clamping: said/plate with a surface of. thei'platefpositioned.with: ree spect to said referencesurface, meansxfor. mill.- ing.axially spacedipoekets" in the interior. surface: 35 of: said plateadjacent: the. straight edges. thereof; said milling means: including a. frame mountedi for: movement parallelsto the: axisof said support, a housing mounted for bodily-movements with. said frame and pivoted. thereto about anl'axis parallel to the directionv of? movement. off. the. frame, a milling-cutterz-and shaft"journaledain said housing for bodily'r'rocking with the housing, driving means including a shaft extending. within said housing :for" driving the milling :cutter: shaft iniall the positionsof-rockingthereof,.tand;= means having interengaging cam trackzandicam. follower components; for guiding. said 'millingl' cutter, one of said components being-coupled to. said milling cutter shaft and' the other of said. components 1 being coupled to said support, part ofsisaid cam track' components being oriented. parallel tothe axis of' said;suppor.t and.partzatan 'angle thereto so that the cutter is :rocked-zinto; engagement with the interior" surface f the plate and then moved 'parallel' to the edgethereofrupon; axial movement: of saidframe;..

'4'..In a machine-for finishing: tension lockup: plates-comprising; in combination; a support for aplate, said:support prrividing:a-v reference sur.:-

face-.together'with means for clamping saidrplate with a surface 0f*the:.p1ateeposition'ediwithre spect to said reference surface; means for milling; axially spaced pockets in: the interior surface of! said plate adjacent'fthe;straight edges thereof;

said milling means: including af frame mounted 65 for. axial movementwith resp'ecttt'o said support; a. housingbodily movable: with. said frame and. pivotedthereto for'roeking-movement about an axis which is parallelito the direction: of movement of said frame, a milling cutter andshaft journaled. in said housing and perpendiculartothe rocking axis for rocking movementof the cutter into-and" out of engagement with the in terior surface of""saicl2 platefmeans; fordriving said milling cutter-=sliaft; a cam track m'bunted 10 on saidmachine and-havinga portion thereof: in; fixed parallel relationito said support. and a cam. follower attached. to, saidhousing for engaging; said cam track so thatzthecutteris' rocked bodily; into: milling engagementwiththe. plate upon. axial movement of said frame,-

5. Inv a. machine for finishing; tension lockup. plates comprising, in combinatioma support for; a plate, said supporttproviding; a reference-' sur-i f ace together with means f or, clampingrsaid-p'latewith a surface of the-plate positioned withe, e.-- spect to-said reference surface, .;means-;f-or mill-mg; axially spaced. pockets 1 in the interior surfaceeof said plate adjacent the straight. edges thereof; said millingmeans including a frame mountedfor axial movement-with respect to.-said.=support,.. a tool mount having a; milling cutter-andshafit J'ournaled therein, means for mounting gsaidptool, mount on said frame for bodily movement theta-hi with .in an axial directionwhile i permitting; said mount-t0 be advanced: transversely to such diIfGOftion; andrtoward therinterior surface of; saidaplate: for pocket-cutting:- engagement between; saidcutter andsaid plate, .and means-including a cam. track and. camfollower. interposed between said: tool mount andsaid. support for guiding said-tool; mount, the cam track being 1 So oriented; relative; to; said supporti that. the-cam'movementfwh' h;

Y results upon axialmovement of said frame GalJlSGSE the cutter to be advanced. toward. the-inner.- face of-said-plateandzthenrparallel toftheq edge? thereof. '1

6. In amachine-for." finishing; tension-:lockupa plates comprising, .in "combination, arsupportzfom a plate, saidrs-upport providing a reference sure face together with meansfor clamping saidplat'e: with a'surface-of the plate. positioned with re-E spect to said reference surface, "means for-milling; axially spaced'pockets in the interior surfaeevofz said plate adjacent the' straightedgesrthereof said milling: means including a frame-mounted; for axial movement with respect to said support-,i. ahousing having a milling-cutterandeshaft jpurnaled therein, a-collar-type couplingaforcoupling; the housing; to said frame-foraxialzmovementlofr the two togetherwhile permitting said; milling; cutterto rock. bodilyin' saids housingdnto. and) out of engagement with thevinterior surface/of. said plate; av driven". shaft extending 1 through: said 5 coupling into saidhousing; andi having, a (right: angle;- drivingj connection: with. said cutter rs'haft;:- a cam; track :mounted .on; said-:maohine; andT'haviing ax-portion. thereof; in fixed-parallelsrelationzto: said support; as wellrasi a portionzat an angle: thereto; and:a .cam-fo1lo.wer coupled: i305 saidhousing. foriengaging said cam. track sorthatthe"- cutter is rockedyinto. miIIingiengagement with-s the. plate and then moves parallel; to: the; edge thereofjupon: axial-movementof-said-framei.-=

7. In; a machinefor: finishing plates: for *-ten@-:

sion lockup andih'aving: agregisteringredge and as,

shaftsand extending into'the region enclosed by said plate and having right angle driving connections with their respective driven shafts, means for rocking said milling cutters and associated shafts bodily about their driven shafts for pocket milling engagement with the interior surface of said plate at the endsthereof, said rocking means including a cam track andcam follower, a portion of the cam track being parallel to the axis of said support and a portion at an anglethereto for rocking said milling cutters into milling engagement with saidplate and then parallelthereto upon axial movement of said frame, said plate clamping means including stop means for"positivelypositioning the registering edge of said plate with respect to thepaths of rocking movement of said cutters to facilitate sixact register of said plate for color work or the 8. In a machine for finishing tension lockup plates comprising, incombination, a support for a plate, said support'providing a reference surface together with mea'n'sfor clamping said plate with a surface of the plate precisely positioned with respect to said referencesurface, means for milling axially spaced; pockets in the interior surface of said plate adjacent the straightfedges thereof, said milling m'eans including a frame having a mount for a milling" cutter thereon; a

milling cutter and shaft journaled in said 'n'iount,

said mount being mounted in said frame "for rocking movement of the cutter about an axis which is 'generally parallel to the axis ofthe plate, feeding means providing relative 'm6ve-' ment between said frame and said support in the direction of theplate axis, and camming means -hav'ing' a movable portion coupled to said tool mount and a fixed-portion mounted on the machine", said fixed and movable portions coasting to'rock the cutter mount forbringlng the milling" cutter int'o pocket-milling engagement with said plate.

*9. In a machine for finishing tension lockup axis, a housing connected to said frame and pivoted thereto for rocking movement about an axis which is parallel to the direction of said relative axial movement, a driven shaft project ing into said housing and coaxial with the rocking axis thereof, a milling-cutter and shaft journaled in said housing and having a right angle drivin'g connection with said driven shaft, and

guiding means havingamovable portion coupled to said cutter housin'gat apoint spaced from the rocking axis thereof and having a portion mount-' ed on said machine in fixedrelation to said support, said fixed and rnovable portions being so arranged as to produce'movement of said movQ able portion and consequent rocking movement of-the cutter into milling position. at the interior surface of said 'plate upon relative axial movement between said frame and said support.

10. In a machine'for finishing tension lockup plates comprising, in combination, a support for a plate, said support including'a reference surface together with means for clamping said plate into contact with said reference surface, means 12 for milling axially spaced pockets in the interior surface of said plate adjacent the straight edges thereof, said milling means including a frame, means providing relative axial movement between said frame and said support, a tool mount having a milling cutter and shaft journaled therein, means for mounting said tool mount on said frame for relative movement'with respect to said support in an axial direction while permitting said mount to be rocked about an axis toward the interior surface adjacent one of the edges of said plate, and means including a cam track and cam follower interposed between said tool mount and said support for guiding said tool mount in the rocking movement thereof, at least a portion of said cam track being oriented so as to move the cutter toward said plate and then parallel to the edge thereof upon relative axial movement between said frame and said support, the rocking axis of said tool mount being spaced below the associated plate edge and spaced inwardly toward the axis of the plate to permit the pockets to be peripherally undercut during the milling thereof for hooking in tension.

11. In a machine for finishing a cylindrically curved tension lockup printing plate having generally arcuate edges and generally linear edges extending substantially parallel to the cylindrical axisof the plate, the combination comprising a support for holding a plate in a predetermined position, milling means for milling pockets in the concave surface of the plate spaced axially thereof adjacent the generally linear edges thereof, said milling means including a frame, means for effecting relative movement between said frame and said plate support in the direction of the plate axis, a tool mount pivoted to the frame on the concave side of .the plate for rocking movement about an axis which is generally parallel to the plate axis, a rotatable milling spindle journaled in said mount and extending generally transverse to the pivotal axis of the.

the relative axial movement between said frame and said plate support.

12. In a machine for finishing cylindrically curved tension lockup printing plates having generally arcuate edges and generally straight edges, the combination comprising a support for a plate, means for clamping the plate on the support, means for milling axially spaced pockets in the concave surface of the plate adjacent the straight edges thereof, said milling means including a frame, means for effecting relative movemerit of said support and said frame in the direction of the plate axis, a tool mount having a milling cutter and shaft journaled therein, means for driving the cutter, means mounting'said'tool mount on saidfrar'ne for bodily movement therewith relative to the support in an axial directionwhile providing for transverse movement;of the cutter toward the interior surface of said plate" for pocket cutting engagement between the cutter and said plate, and a drive including elements interconnected respectively with said tool mount and said support for advancing the cutter toward the inner surface of said plate.

13. In a machine for finishing a cylindrieally' curved tension lockup printing plate having generally arcuate edges and generally linear edges extending substantially parallel to the cylindrical 13 axis of the plate, the combination comprising a support for holding a plate in a predetermined position, milling means for milling pockets in the concave surface of the plate spaced axially thereof adjacent the generally linear edges thereof, said milling means including a frame, means for effecting relative movement between said frame and said plate support in the direction of the plate axis, a tool mount pivoted to the frame on the concave side of the plate for rocking movement about an axis which is generally parallel to the plate axis, a rotatable milling spindle journaled in said mount and extending generally transverse to the pivotal axis of the mount, means for driving said spindle, and a drive including elements interconnected respectively with said tool mount and said support for advancing said milling spindle toward the inner surface of said plate.

CURTIS S. CRAFTS.

CHRISTOPHER VEVRNE KNELL.

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

UNITED STATES PATENTS Number Name Date 679,278 Crocker July 23, 1901 1,324,562 MacConnell Dec. 9, 1919 2,085,908 Huck July 6, 1937 2,168,548 Wood Aug. 8, 1939 2,341,194 Schwartz Feb. 8, 1944 2,424,524 Weimer July 22, 1947