US1704311A - Mold-bearer-cutting machine - Google Patents

Description

- L. W. CILAYBQURN IOLD BEARER CUTTING CHINE 'Much s, 19,29

Fned May 1e, 1927 3 Sheets-Sheet FOUNDATIONS ilk/1114112 i um.. m Vd n u u wu L Match 5, 1929. K L w, LAYBoURN 1,704,311

HOLD BEARBR CUTTING lIiAGHINE Filed May 16, 1927 5 Sheets-Sheet 2 March 5, 1929. L.. w. CLM/Bouma` IOLD BEARER CUTTING MACHINE Filed may 1e, 1927 s sheets-sheer 3 Iigl 7 F* /44 4.3 /4/ 14a 5/ ff /44 .vphj /35 1F M/34 32 mi? .sa J3 /39 o v. [32 o* u /33 19t-- o -319 o 69 I POUPDATIGM sa sa V 'ifik 5 /04 la, j v v 2. 94 E x55.

Patented Mar. 5, 1929.

LESLIE W. C'LAYBOURN, OF MILWAUKEE, WISCONSIN.

MOLD-BEARER-CUTTING MACHINE.

Application led May 16,

It is the object of my invention to provide means whereby to cut bearers in a mold for a printing plate, in order that the printing plate formed from such mold may be equalized throughout its area for resistance to pressure and bending forces applied to the printing plate. My invention is exemplified as operating upon a so-called Wax mold, although it is obvious that the material of which the mold is composed is not restrictive upon my invention.

It is a practice of the modern making of printing plates to exert pressure upon the printing plate While the printing surface thereof is resisted bv a smooth hard surface,

in order to bring the various printing surfaces of the printing plate into the same plane, whether the plate be flat or curved, the planein the instance of curved plates being a cylindrical plane,and it is also the practice to bend arflat printing plate in order to form a curved printing plate suitable for instance for application to a plate cylinder of a rotary printing press.

Many printing plates are provided with printing portions in only a part or in separated parts of the area thereof, and many other printing plates are provided With printing portions which are more Compact,

or in which the printing lines are broader,

in some portions of the printing plate thanA in others, with the result, when pressure is applied to compress the printing plate, or to press all parts of its printing portions into the same plane, that uneven resistanees to the pressure forces are found in different parts of the printing plate, those parts with light, few or separated printing surfaces being obliged to resist the saine pressures as those parts with more condensed printing surfaces, or larger printing areas, in consequence of which the light or separated printing surfaces and the edges of printing areas are unduly pressed, and a printing plate is produced which is not perfect.

It has also been :found that upon bending stresses being applied to printing plates having unequal or unbalanced areas of printing portions, that unequal resistances to said bending stresses are found in the various portions of the print-ing plate, depending on the unevenness of the distribution of the printing surtaizes thereon, .and a eurwd claims.

19a?.` serial No. 191,915.

printing plate is produced which is irregular 1n its curvature, or in the location of all its printing surfaces in the same cylindrical plane. l

The form from which a mold is made is usually composed of type, cuts and the like, or previously made printing plates, or any one or more of these. The form is usually surrounded by a marginal line of bearers, these bearers being primarily for the purpose of preventing shifting of the `form on the mold when pressure is applied between the forni and the mold, forcausing indentations or depressions in the mold of the printing portions and the bearers# i It is the object of my invention to provide means whereby the` mold, in which `auch depressions ot printing portions are made, with additional ora-informed bearer depressions in the imprinting portions of the mold, so that, Whenithe printing plate has been formed from such mold, as by electrodepositing, casting or other process, or one or more of the same, there are printing areas and bearer areas of equal height Well distributed throughout `the rinting plate, for forming theprinting pate at its various portions of equal thickness in order to resist i pressure, bendinor stress, or the like, to substantially equal extent `throughout the area of the printing plate. Y

The printing depressions formed in molds are in practice of different depths in `different molds, depending on the solidity, openness or extentof the printing areas `in the form, and the pressures `applied in `forming the mold therefrom. It is `the object of my invention further `to provide novel means whereby `to gagethedepthof the cutter for torniing the `aiterdiorrned bearer depressions in the mold; further, to provide novel `means fou determining the cutting relation of the Cutting tool to the mold; further, to provide novel means foreontrolling the operative relation between the` cutting tool and the mold; and, further,to providenovel means for providing coactiva movements between the cutting tool andthe mold. The invention will beifurther readily understood from the `following description and and from `the drawings, in which lattermW` l Fig.' i `iaajplau view `et n. mold having lill therein areas of printing portions and areas ot' imprinting' portions as heretofore usually constructed.

Fig. 2 is a cross-section ot the saine7 taken on the line 2 2 of F ig. 1.

Fig. 3 is a cross-section ot the saine, taken on the line 3-3 oi Fig'. 1.

Fig'. 4: is a plan view et the saine, showingl the mold after being; operated upon by my improved device.

Fig. 5 is a eroi etion ot the saine, taken on the line 5--5 oit Fig. et, showing the atten torined bearer-d@pressions in the mold.

Fig. 6 is a eressseetion ot the saine, talren on the line (3(3 et Fig'. Il.

Fig. 7 is a plan viewY oit a printing plate, which may be an oleetrotype, made troin the inold shown in Fips. 1, 2 and Fig'. 8 is a cross tion of the saine, taken on the line 88 oit Fig. 7.

Fig'. 9 is a cross-section ot the saine, 'taken on the line 9 9 of Fig. 7.

Fig. 10 is a plan View et a printing plate made from a mold shown in Figs. ll, 5 and 6, having my invention applied thereto.

Fig. 11 is a crossjsection of the saine, taken on the line 11-11 of Fig. 10.V

F ig. 12 is a cross-section et the saine, taken on the line 12-12 of Fig. 10.

Fig. 13 is an enlarged detail et the latter;

Fig. 1l is a trent elevation oi" iny improved device.

Fig. 15 a side elevation et the saine, partly breken away.

Fig'. 16 is a fragmentary rear elevation et the saine.

F ig. 17 is a plan view otl the saine.

Fig. 18 is a vertical longitudinal section of the saine, taken on the line 18-18 of Fig. 17, and partly broken away.

F 19 is a fragmentary vertical crosssection of the saine, `talrcn on the line 19-19 ot Fin'. 17.

Fig'. 20 is a cross-section ot the saine, taken on the line 20--20 of Fig. 19.

File'. 21 is a detail of the positioningA nieans for the cutter, taken in section in the plane oit the line 21%21 of Fig. 18.

22 is a cross-section of the saine, taken e plano oli the line 22.22 of Fin. 1 8. Fig'. 2?) is a detail of the stop for the cut i talien in section on the lino '7 i ig. lli.

Figi'. 2t is a side elevation ot the cutter in its socket, the latter' shown in vertical section; and,

Fia'. 25 is a cross-section ol' the saine, taken on the lino 25-25 of Fig'. 24.

The printing' plates may be electi'otypes, stereotypes, or printing plates otherwise termed, or termed et different material. The printing plate 31 is exemplified as an electrotype, (see Figs. 9 and 13), which coinprises an electro-deposited shell 32 and a backing 83 of metal cast in the shell;

In the modern practice et correcting printing plates it is usual to support the print inp,1 surface of the printing plate by a smooth hard surface and to apply pressure to the printing' plate for bringing all the printing surfaces thereolI into the saine plane, as shown, described and claimed ttor instance in United States Letters Patent llo. 1,549,- 185, granted to nie August 11, 1925, 'lor iinproveinents in method et correcting printing plates and printing plates produced thereby.

It has been found, in applying pressure upon a printing' plate which has unbalanced areas et printing,` surface, that those portions et the printing plate, at 311-, which have restricted or small areas ot printing,r surface, and the edges 35 of printing portions of the printing' plate adjoining;` imprinting` portions, are less resistaiit to the pressures applied to the printing plate, than the printing portions thereof, at 36 (Fig. 7), which here greater aree-.s oit printing snritaee, with the result that such portions ot less resistance are likely to be and often are deformed llt) oi' spread, in a manner to mai' the excellence of the printing plate.

It has also been found, in curving printing' plates thus formed with unbalanced printing areas, that the thicker portions oli the printing plate resist the bending` stresses to greater extent than the thinner port-ions, resulting; in a curved printing' plate in which the printingI1 surfaces are not in as true eylindrical Jforni as they should be, or in which the curvature et the printing` plate is ii'- i'egular.

In oi'der to avoid these objections, l provide the imprinting' portions ol" the print ing plate, as at- 37, (Figs. 7, 8 and 9), with additional thickness so as to balance the resistanees of the printing plate througliout its area. l accomplish this by providing the printing; plate with additional bearers in the unprinting portions thereof, or in the spaces adjacent to the printing portions, as exemplified by the raised portions or bearers 238 in the printinfrj,r plate. (See Fins. lll, ll, 12 and 13.) i

These bearers aid in resisting; the prow-ure applied to the i'irinting' plateiii correcting' the saine, and aid in. resisting' the licnilini;l stresses when curving; the pi'iutiunj plate. so that excess pressure is taken oli ot the isolated printing,` parts ot the printing' plate, and crushiufr. (lelii'iniiip' or niutihition ther ai led, and se that a iiniforni hotly Ytor the printing plate is provided in which the rrsistance to bencliri.Q is sulistantially evenly distributed for enabling a unitorin curvature to be applied to the plate.

After the printing plate has been con rented, or curved, and otherwise coii'ipleled1 as the ease may he, the ext-ra hea" "s are rcmoved by routing', or in other de. .alile inanmossi 1 ner, for instance, to the dotted line 39 .inFig 13, so that the imprinting portions of the printing plate are in properly low relation to the printing portions of the printing plate for proper inking and printing. The printing plate is formed from oi upon a mold, which has in it the reverse counter parts of the printing plate formed thereby.

The mold may be of suitable character, but is instanced as a usual wax mold 42, coinprising a layer or sheet of wax in which an impression of the printing form is made by pressure.r "this layer or sheet of Wax bein upon a backing sheeto't' metal. The mol as thus made. referringr to Figs. 1 to 3 inelusive, is instanced as embodying printing portions 2li, 45, 4G, and imprinting portions 47, corresponding to the printing portions 34, 35, 36, and the imprinting portions 37 in the printing plate and corresponding portions in the forni from which the mold is made. This forni is siii-rounded by a line of forni bearers, the depressions of which are shown at 48 in the mold. These forni bearers are at theoutei margins o'l" the form and are provided primarily for the Jurpose of preventing lateral shifting of the orni on the mold when pressure is applied. The depths to which` the printing portions of Vditferent formsare pressed into their respective molds vary. p y

Thenever print-ing portions,A imprinting portions, and bearers or bearer portions of the mold are hereinafter mentioned, it will be understood that those portions of the mold are referred to from which the printingr portions, the imprinting portions and the bearers or bearer portions respectively of the printing plate are formed, these respective portions in the mold being the reverse in elevation and direction of the corresponding portions in the printing plate formed therefrom.

Then e1ni loying my improved. device I first form the mold with the usual printing areas, and the usual imprinting areas, the latter being represented in the mold by the retained thickness of the materialof the mold, or by leaving such portions of the mold unimpressed. i i

l provide the mold thus pre'lfiiirined. with after-torined bezii-e1'depressions, which in the inold are represented by additional dc- ]Aiiressions 51, (see Figs. 4, 5 and 6), formed in the niold by removal of material therefrom to a depth equal to the depth of the impressions oi' the printing characters in the mold. Fliese bearer-depressions may assume various shapes, and extend throughout different arcas.v depending on the arrangement and character of the printing surfaces Which are formed in the mold by the printing form, the object being to associate such printing portions oit' the mold thus preforineilwitli after-formed `lifnirer-impressions of equal depth adjacent thereto, so as to relieve slight or separat-ed printing areas or characters in the printing plate formed from the mold of undue pressure, and `to transfer the resistances to such pressure to the additional bearers thus formed in the printing plate as counterparts of the bearer-depressions thus formed in the mold.

It is desirable to form these bearer .depressions in the mold by removal of materials from the face side of the mold, and it is desirable that this removal shall be accurately accomplished so as to provide bearerdepressions `which are equal in depth to the depth of the printing depressions. `I prefer to accomplish this removal by `means of a cutting edge of a cutting tool which is sunk into the imprinting portions of the mold to a depth equal to the depth of the depressions of the printing characters in` said mold, and to cause travel between such cutting edge and the mold so as to forma groove or grooves in said imprinting portions oi a depth equal to the depth of the printing depressions, the cutting tool removing the material of the groove or grooves past the surface of the face Side ofthe mold.

This removal may be accomplished by a single passage between the tool and fthe mold, Wit-li the tool at extreme depth in the mold, namely in the plane of the bottoms of the printing depressions, or `by a number of such passages to remove the material of the mold in successive steps in each of which the tool is deeper in the mold, until in the final passage the tool is in the plane of the bottoms of the printing depressions in the mold.

I prefer that thetravel between the `ciutting edge and the mold shall be in various directions, depending on the sha of printing areas adiacent to the imprintingr :portions and the extentiof such imprinting portions.

After the bearer depressions havebeen cut into a wax mold, any rough edges left by the cutting tool are smoothed or removed `loy the momentary application ot a `hot blast which melts such rough edges.

The apparatus exemplified comprises a bed 61, supported on a` suitable base, shown comprising legs 62, rigidly secured to the base, and tied together b tie-rods.

A carriage 65 is slidab e on guides `66 on the bed, the carriage being :provided with giiideways 67 complemental to the guides.

The mold 42is arranged to he rigidly held to the carriage so as to lie Hat on the plane supporting surface ofthe carriagefas by means of clamps 68. The carriage isprovided With an undercut groove 69,` in which a base 7() provided with tongues is arran ed to slide. A clamping arm 71 is pivot to the base by a pin 72locat`ed in bearingsof i 1 lugs in the base and in uthe arm, Aiscrew- ,y rod 73 is held downwardly by heeel being received in a recess 74 in the base. The screw-rod passes freely through a hole 75 in the clamping arm. A nut 76 is received over the threaded portion of the screw-rod and has a handle 77 by means ot which the nut may be readily turned for clamping the clamping shoe 78 et the clamping arm upon the mold, clamping the mold to the carriage. A spring 7 9 between said arm and said base normally urges the clamping arm in unclamping direction.

A screw-rod 81 is journaled in bearings 82, 83, in the bed, and is heid endvfise therein by collars Sii, 85, pinned to the screw-rod. A hand-wheel 8G and handle S7 thereon are arranged to turn the screw-rod. A nut 88 depends from and is lixed to the carriage and is threaded to t e screw-rod. Rotation ot the screw-rod n.11 7es the carriage in one direction or the other along the g es therefor on the bed according to the direction ot rotation of the hand-wheel.

A cutter 91 having a cutting edge is arranged to coaet with the inold on the e; rriage. The cutter is releasably secured to a eutterebar 93, as by insertion oit its shank 9d in a socket 95 in said cutter-bar, and the clamping oif said shank in said socket by means of a set-screw 90 having a turning knob 97 thereon. Cutters having cutting edges of different widths or apes are arH ranged to be interchanged in cutting position on the cuttersbar.

The cutting edge is adjustable toward and from the supporting face oi'V the mold for determining the depth of the cut to he made in the mold, and means are provided Ytor moving said cutting' edge toward and from the mold for moving the cutting edge into and out of the tace side of the mold, and means are provided for positioning the direction in which the cutting edge is presented for presenting the cutting edge in proper relation according to the direction et movement between the cutting edge and the mold.

The cutter-bar is mounted in bearings 101, 102, on a slide 103; The cutter-bar is positioned ondwise in said bear-in as by locating the bearings between a smulder 1041 on said bar'and a handle 105 iixed to the oppo- .site `end of said bar. The cutter-bar is rotativeiy positioned in said bearings, and is provided with recesses 10G, which recesses are shown 90O apart. A bali 107 in a socket 108 in the wali ot the bearing 101 is normally urged toward said cutter-bar by a spring 109 in said socket. The ball is received in said respective recesses tor maintaining the cutter-barili adjusted position during the cutting operation.

The slide 103 is mounted on a roeker-arin 111 and is adjustable to elevation thereon. A screw 112 is journaleo and held endwise in a bearing 113 on a bracket 114 on said l. Si

slide, and is threaded into a threaded hole 115 in said arm. The screw-rod is provided with a handle 116 for ready rotation ot the saine. Rotation of the screw adjusts the screw up or down, according to the direction ot rotation, `for positie-ning the cutting` edge. The slide is slidable in a guideway 117 in the arm. The slide is clamped to the arm aitter adjustment by means oit a clampscrew 121 extending through a slot 122 in the slide and threaded into a threaded hole 123 in the arm. A washer 124 is received between the walls ot said slot and a head 125 on- Said :;ei'ew. A handle 120 is iiXed to Said head for manipulation oi the screw.

The erin is pivoted to and adjustable lengthwi e o1'.i a screw-rod 131 journaled in bearings 13 1153, upon brackets 13st, 135, extending 'from the bed. The screw-rod is held cndwise in said boarinijs by shoulders 1313, 137, eoaeting with seid bearings. A hand-whcel 138 having a handle 189 thereon is tired to saidf-1erew-rod tor rotating the saine. ilhcn the screw-rod is rotated, the arm 111 is moved crosswise ot' the bed in one direction or the other, depending on the direction o1 rotation of the screw-rod.

The rocking movement of the rocker-arm is obtained by a bar 1411 received in a fork 112 in said rocker-arm. The respective ends ot the bar are received in guideways 113 in the inner faces of brackets 1114 extending from the brackets 134, 135. The rocker-arm nieves lengthwise of said bar during the lateral travel oit said rocker-arm. The faces et the bar coacting with the faces et the forli in said rocker-arm are preferably rounded, as shown at 145, for accurate movement ot the rocker-arm and close engagement between the engaging surfaces ot said bar and said forli throughout the lateral positions and rocking movements or the rocker-arm.

tops151 are provided at the respective ends et the bar. These stops are shown as clips for closing the upper ends of the guideways 143, and are secured to the brackets 1fl-i by bolts 152. These stops limit the extent et movement oi' the cutting edge into the mold, and, with the adjustment oit the cut-ter slide, determine the depth olf the cut made by the cutting edge.

Movement of the cutting edge out oi the lucid is obtained by the retracting more nient oi a treadle 155, on a treadle-levin' 150, which is pivoted on a tie-rod 157 between the side trames ot the base, and is articulated at 158 with a link 159. The link 150 has articulation at 160 with an arm 101 fixed a rocker-rod 162 journaled in bearings 163 on brackets 16d` extending from the bracliets 134, 135.

Rocker-aims 165 are fixed to the respec tive ends et said rechi-arend and havearn ticuletione 150 with links 167 having ertieit lations 168 with `the respective ends of the Abar 141. i

` A spring 171, `the respective ends of which are .er-cured to the tiesrod` 172 and ito the trefufiiefiever 156 nornuiilyfholds the treadlelever in raised'relation, and urgesniovenient oit the har 141 away from the stops 151. The-cutting edge 92 normally positioned at its limit oi movement away `frointhe bed.

It it is desired to operate on a mold, the mold slipped `under `the cutter and clamped to the table. The cutter-support is adjni-zieil laterally by rotationof the handwheel 13B, and, it necessary, the carriage 'L is moved, by `rotation ot' the hand-wheel `86,

to posit-ion the cutter' at a printing depression inthe mold, the cutter being out of contact with the mold. Thecutting 4edge is caused to descend into said printing depres- `sion by depression of the treadle and the height of the cutting edge is adjusted by rotation of the lmnd-wlieel 116, so that the cutting edge just touches the bottom of said printing depression. 1T he cutterslide is then clamped in' adjustedposition. It is to be understood that whilst such adjustment is being made, `the slidebar 1111 is in contact withV its stops 151` for definitely limiting the downward movement of the cutting edge.

The `treadle -is then released "for raising the cutter out of the printing depression,

and the cutter "traine is adjusted laterally,

y ce

by operation of the hand-wheel 138, and, it nemessary, the carriage is `moved `by rotation ot the hand-Wheel 86, to locate thecutting edge in a position at the imprinting portion oi the mold which it is desired to provide with abearer depression. The cutter-bar 95 is rotatively set by rotation of .the handle 1U() to present the cutting edge in `desired direction for the direction of desired movement between the mold and the cutting edge. The cutter is then moved into the face side of the mold by pressing on the treadle. The desired movement is then imparted either by the hand-vvheel 86 for moving the carriage, or by the hand wheel 138 for moving the cutter, as may be desired, or the direction of presentation of the cutter ma determine, or by both said hand-Wheels i a diagonal path of the cutter is desired. The screwrods 81 and 131 ma have threads of comparatively high pitch for rapid traverse of the cutter and carriage` for rapid operation.

Assuming that a path is desired to form a parallelogram 175 in the printing portion oi the mold, the cutting edge is presented in a direction transverse to the carriage and the carriage moved rearwardly. The cutting edge is then rotated 90o, and the cutter-head moved laterally in one direct-ion. The cutter-bar is then rotated another 90, and the carriage moved forwardly the desired eX- tent. `The cutter-har is then rotated "an` `the other `90",Hand thecutter-head caused to travel in the `oppositedirection` to complete rallelogranrl It desired, thedepth oficut `may he`obtained by successive settings and cuttings, each removing a portion `ot the thickness of nml-@rial 'for :toi-ming the depression, `until the depression of `the desired depth.

It is desirable that the area of bearer depressions in the mold shall heigagedhy the density ot the printing portions inthe mold. Thus if the printingiportions be close or dense,"the bearer portions `in the un` rinting ptn-tions will be madefdense, an ifthe printing portions be light, the bearer por-` tions "in the imprinting? poc-tions will be made correspondingly light, to produce uni- -iormity `in thickness inthe printing plate.

The action ofthe" cutter is preferably to remove thee-hips arisiiwfroni the cutting past the upper surface o? `the mold, and the form `of the cutter is preferably such `that sharp outlines of the Wa'ils an bottom of the groove being cut are `orrned, and a sharp upperedge for said *Walls -is provided. It will he noted that the advancing side of the cutter is hollowedadjacen't toits cutting edge, the body of the :cutter receding as shown at 177 above ithe cutting edge, and then curving forwardly, `as shown at"178, for ready relief of the `reinoved strip ofthe mold. `The sides of thecutter adjacent` to the cutting edge and throughout the Wails of the groove "formed *by the cutter are sharp, for making clean cutsiattiie bottoms, sides and upper-edges of said Walls.

Closely adjacent parallel grooves may also` i be cut insaid unprinting portions ofthe mold, as *Well as Jgrooves which merge into each otherpanid other forms"andirelatiolis of `,f rroovesmay he out, or any desired "dir-ec tion, `Width or i shape i of grooves or.` corelatimi of grooves may be out, as may be desired.

The mold may be clam ed on the carriage with its sides parallel with the sides of the` carriage, as shown in Fig. 17 or said mold may be clamped in any desirable angular position, depending on the directions i in which it is desired to cut the grooves in the mold. These `grooves.` are desir-ably cut parailel with ad3acent printing lines, so that, t

if the printing lines are angularWith relation to the mold, the moldis desirably angularly clamped onthe carriage.

Then the printing plate `is formed from a mold formed as herein dcscribed,` thev after-formed bearer depressions are reproduced With the printing "depressionsin the printing plate as bearers and as printing elevations respectively, `of equal height, for

`lio

scribed and claimed the same in a copending application tiled by me in the United States `Patent Ollice May 9, 1927, for patent on improvements in method of forming molds for printing plates, as Serial No.

What I do claim herein as my invention and desire to secure by Letters Patent, is:

l. In a bearer cutting machine tor molds having indentations therein 'for the printing portions of printing plates and areas of nonprinting portions, the combination of a cai riage provided With a supporting surface tor the mold, a cutter having a cutting edge which is non-rotating during cutting and a receding portion above said cutting edge for upward removal ot the material cut, means tor adjusting theangle ot presentation of said cutting edge to the mold and maintaining said cutting edge in such ad justed angular positions, a slide tor si cutter, a pivoted support ior said slide, means for adjusting said slide on said support in a direction transverse to said supporting surface for positioning the cutting edge of said cutter in contact with the bottomhotV a printing indentation in said mold on said carriage, a stop for said support during said lastnamed adjustment, treadle means for pivotally moving said support and causing approach and recession between said cutting edge and said supporting face of said carriage, and means for causing travel in relatively right angular directions in a plane parallel with said supporting tace between said support and said carriage, constructed and arranged for entry of said. cutting edge into said arcas ot' said non-printing portions and linear travel between said cutter and said carriage with said cutting edgc'in the plane ot the bottoms ot said depressions.

2. In a bearer cutting machine for molds having indentations therein tor the printing portions ot printing plates and areas ot nonprinting portions, the combination of a traine, a carriage movable on said 'frame and provided with a. supporting surface for a mold, a screw-rod extending transversely above said carriage, a cutter-supportpivoted to and movable lengthwise of said screw-rod, a slide thereon, means for adjusting said slide on said support, a cutter on ,said slide, said cutter having a cutting edge which is non-rotating during cutting, an operating bar, guiding means between said trame and said operating bar, limiting stops at the respective ends of said operating bar, said operating bar having operative con nection with said pivotcd support for pivotally7 moving said pivoted support, treadle means for operating said operating bar, means tor rotating said screw-rod and thereby laterally moving said pivoted support along said operating bar, means tor causing travel of said carriage at' right angles to said lateral movement ot said support, and means for adjusting said cutter about its longitudinal axis for presentation ot its cutting edge in ditterent directions to the mold and maintaining said cutting edge in said adjusted positions While in the mold.

In testimony Where-of, I have hereunto signed my name. i

LESTER WT. CLMYBOURN.

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