US2520201A

US2520201A - Stereotype plate casting machine

Info

Publication number: US2520201A
Application number: US709951A
Authority: US
Inventors: Frank A Foster
Original assignee: GOSS PRINTING PRESS CO Ltd
Current assignee: GOSS PRINTING PRESS Co; GOSS PRINTING PRESS CO Ltd
Priority date: 1946-11-15
Filing date: 1946-11-15
Publication date: 1950-08-29
Anticipated expiration: 1967-08-29

Description

-Aug. 29, 1950 F. A. FOSTER STEREOTYPE PLATE CASTING MACHINE 2 Sheets-Sheet 1 Filed Nov. 15, 1946 INVENTOR.

FRANK A. FOSTER Aug. 29, 1950 F. A. FOSTER 2,520,201

STEREOTYPE PLATE CASTING MACHINE Filed Nov. 15, 1946- 2 Sheets-Sheet 2 INVENTOR.

77 FRA NK /4 Foams/e A TTO/iNE Y5 Patented Aug. 29, 1950 STEREoTYrE PLATE CASTING 'MAGHITNE Frank A Faster, Mel Perk assi no to The Goss winging m ss C mpany Chi a o, 111., a corporation of Illinois Appliggtiggg oyemher 15, 1946,8eria1N0. 109,4951

3 "Claims.

invention relates to st reotype plate eastin; meehin s .fQr eestine re esses in th -heck of a .cy 'inplrical .or semi-ey ndr ea stereotype p ate Ob ects and el an eees of the inve tio wil be set forth in part hereinafter and in part will be obvious herejro n, or may be learned by practice with the invention, the same being reaiized and attained by means of the instrnmentalities and combinations pointed. out in the appended claims.

The invention consists 'i-n'the novel parts, constructions, arrangements, combinations, and improvements herein shown and desoribeol.

The accompanying drawings, ;referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and together with the description, serv to explain the principles of the invention.

Of the drawings:

Fig. i is a vertical moss-sectional view of ;a stereotype plate casting machine embodying the present "invention, taken along line l-| of Fig. 3;;

Fig. 2 is a perspective view of a recess forming bar shown separated from other parts ofthe-plate casting machine of Fig. 1

"Fig. 3 is a horizontal cross-sectional view taken along line 3?? of Fig. 1 with a cast plate and matrix in position in the machine;

Fig. 4 is a cross-sectional view taken along line fl-d of Fig. 1;

Fig. 5 is a view partly in side elevation and partly in cross section of the plate casting m achine shown-inthe other figures; and,

j-Fig. 6 is a-perspective view of aninsertmember forming a part of the invention,

With the advent of high speed printing, it has been found desirabl to subject stereotype plates o ci cumferential t nsioni h s s no e bre eurins the leading edge of the ste eoty e :ma to the elate ylinder and thy impos n e irenmfe entiai tension on the trai n edge f the n te The natelit-s to Crnf s 52,041,357, dated Ju y 151,, 1193.6, Roster 24051364, ated July A., 1936. nd Worthington 2.23.6.23Q, dated March A 51,, ShOzW typical mechanism @31 impos ng .ei um ential tension .on. a. stereotype plate. It is impqr t speed printing, that this iension .be imposed. 1-inor er th t h plat .et a l time will fit atightly .against (the Zplatec,i1ii1.d-e.r-.,e n,d in ,order to geornpensate :ior deformation due to possible flow .of ameiZZi-I due rte z ne pr ssure between he ple-te a-ntlrform cylinders. llhense of oirenmfer entiai tens-ion also cou-nteeaet t e :efiec of ..entrifugal force which is considerable in high speed mom-m8.

The eieiee e the pres nt inv ntion i we: ride a ees in hex awi i t e eeeee z etlie hee s 9f t e s e eotype mete, int wh ei rec ses eni-te le n on en rrine mea s ma eneese wh n he nle- ,en-then e e ee Me is eeiu all he n en p ovid s slide-- 2 1? bee 1: th e e 0. t e us al ne O in e ste eot p p ate e st ee :meehme, Wh eh Bean carry elies to rr r e h p o e eeesses the inner surface of the finished. plate. lfhe negess ion s n here a ermed w th n ned edges o mere-mete '\v' -th.cor P ine1y ee sur eee o e ee es h r e eveteii d,

N i e eit .di ally of c re, bu e nei @Mt s t on irom t i \e oove The {ree .i me here e e eeted to he con for iimte eemen i-n-their respeet e rooves.- m

ar el e eenn eted t the cellar of ihe eases m ehen sm which pu hes t finis d iflete one the core to rs ee it en. the conne ions of the ere bei g :s e h fin shed n ete e bie r fi s hush d e on the co e n d l e n anderee t rrn vement 9it1 ei9 5t 5i mfi fiQ and .met n -e he lat is-centi u e i lane the pla in pe t en to b rem v d ri e-em the meehin 1 The r ess ion-nine ba s are of tapered ierm r m n b in ght y id at the t p th n at the bottom, said :iormation ,being :aeeompiishegi by P W diDg e st ez eht ed ipr the par nearer the par n her of the pasti apparatus end an a nelm epn s te ed e, -50 that es t e fi d p ate is eing v.e ed the .n eess 0mins her heeome emewnat free i heir g oove in the +9 .as they move w h espec he ete, and more awey re t e leadin dge of he plat neee fi rel ev ng t on id rabl pn ssi r of the melee p ate on the bar prior to final d l e ing. siie orti ns f h e fe m g ba s ar rtenered E em la e at bottom K s i htly -.s e1:1e at th top so that the bars a d plat a e relatively moved during the delivery of ,the plate, the latter may ,be ea i y eme ed pm the easting-me hine- It w l be unde stood th t t e iereeqins eenere de ri t and vthe f w n detai d fee: e i tien es W611 e e m ar and esn enete ey o th in ent o but are n .r t etiv.e t ee-995i- Refi r ne new in .deta l to the n i ed em.- bodiment Of ithein en i n :il k 1t th gee eempannn (d a in s the st reoty e me e eas ne mach n e e -.i1 -1}1stra1' ed is its main .z eet e of e ;.l wn ty e es sh w :my Patent N9-.2..;1. A1Q3 e .e tee Novembe 8fl- K ine mechanism comprises standards ll! supporting a core II for casting a cylindrical plate; it will be evident, however, that this invention may also be applied to the casting of a semi-cylindrical plate.

Cooperating with the core II is the usual two part drag composed of parts I2 and l3 hinged together by hinges I4, the two parts of the drag being swingable about the hinges by the conventional handle (not shown) and lockable in closed position by another handle, not shown.

The core of the embodiment here illustrated is tiltable to and from casting position by the handle I1. A parting strip 20 is provided for positioning the matrix 2|, and a parting bar 22 is provided on the core II to form the vertical walls of the casting chamber corresponding to the gap in a cylindrical stereotype plate 23. A

collar 25 is provided surrounding the core II and having a reduced portion 26 to serve as a bottom forthe casting chamber and also to eject the plate 23 when it is cast by pushing it along core II. The mechanism for automatically operating collar 25 to eject the plate when core II is tilted by means of handle I! comprises pintles 2'! fixed to and projecting from opposite sides of collar 25. Pivotally mounted on these pintles are

arms

29 and 30, the lower ends of these arms being pivoted on pintles 3| and 32 which are mounted in the frame members I0.

Coming now to the features constituting the present invention. the core II is provided with a pair of longitudinal tapered grooves 35 spaced to either side of parting bar 22, and these grooves receive the tapered recess forming bars 36. The grooves 35 in the core are provided with inclined edges 31 to cooperate with the oppositely inclined edges of bars 36 to form a dovetailed joint as shown in Fig. 3. so that the bars may be moved longitudinally with respect to core II but will be held in their respective grooves.

As shown the bars 35 are each formed with die portions 4!] which extend radially outwardly from the core and into the casting chamber between the core I I and the matrix 2!. These die portions are adapted to form suitable recesses in the inner surface of plate 23 to receive plate tension mechanism. As best shown in Fig. 2 of the drawings, die portions 4! are tapered, being some what wider at the bottom than at the top, formed with a straight edge 4I toward the leading edge of the plate and an inclined opposite edge 42 for a purpose which will presently be set forth. The bars 36 are also of tapered formation, being wider at the top than at the bottom, having straight edges 44 toward the edges of the plate and inclined opposite edges 45. Grooves 35 are correspondingly tapered to tightly receive the bars 36. Thus, when the bars 36 are moved upwardly with respect to core I I in their grooves 35, they become loose therein and may be forced toward their edges 45 by the pressure of the cooled plate upon die portions 40.

As best shown in Figs. 1 and of the drawings, the bars 36 are mounted for limited relative mo tion with respect to core I I, each being provided with a screw 46 threaded therethrough, the reduced ends 47 of which extend into deeper recesses or grooves 48 in the core. The enlarged heads 49 of screws 46 are positioned in longitudinal slots 50 in portion 26 of collar 25.

With the construction shown it will be apparent that when the casting box is opened and the core II is tilted for delivery of the plate 23, the collar 25 will force the plate and the bars 36 removed from the casting mechanism.

When the core II is tilted back to casting position, bars 33 will be returned to their lower positions by the engagement of screw heads 49 with the upper edges of slots 50, and will be accurately positioned for the next casting operation by their tapered edges in grooves 36.

As best shown in Figs. 4, 5 and 6 of the drawings, an insert 52 is positioned adjacent each recess forming bar 36 in suitable grooves in the core II and collar 25 in order to provide a tight seal and prevent molten metal from going down into the crevices of the sliding joints. The inserts are closely fitted to both the collar and the bars, and each has a straight side 53 to permit the collar to slide and an inclined side 54 to permit the bar to slide and to relieve tension on the platewhen the core is in delivery position.

The invention in its broader as ects is not limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its chief advantages.

What is claimed is:

1. A machine for casting stereotype plates with recesses in the back thereof comprising a core, a jacket surrounding the core in spaced relationship thereto to provide a cylindrical casting space with an open end, a collar surrounding the core for closing the other end of said casting space said collar being longitudinally movable with respect to said core for moving a plate in said casting space toward said open end, a margin bar extending radially across said casting space along the length thereof to provide separated and spaced ends of a stereotype plate cast in the casting space, said core having a pair of grooves extending longitudinally thereof said grooves being positioned one on either side of said margin bar substantially parallel and adjacent thereto, a recess forming bar in each said groove slidably mounted therein and extending throughout the length of said casting space, each said bar having a die portion thereon extending longitudinally the entire length of said casting space and radially into said casting space to form recesses in the plate cast therein, said die portions being longitudinally tapered with the greater width at the bottom, and said recess forming bars being longitudinally tapered with the greater width at the top, said core grooves being tapered correspondingly to said bars, and means interconnecting said core, collar and bars permitting limited relative longitudinal movement of said collar and bars with respect to said core and with respect to each other including a limited longitudinally slidable connection between each bar and the collar, and a limited longitudinally slidable connection between each bar and the core, each said connection comprising a radially extending projection received in a longitudinally extending recess.

2, A machine for casting stereotype plates with recesses in the back thereof comprising a core, a jacket surrounding the core in spaced relationship thereto to provide a cylindrical casting space with an open end, a collar surrounding the core for closing the other end of said casting space said collar being longitudinally movable with respect to said core for moving a plate in said casting space toward said open end, a margin bar extending radially across said casting space along the length thereof to provide separated and spaced ends of a stereotype plate cast in the casting space, said core having a pair of grooves extending longitudinally thereof said grooves being positioned one on either side of said margin bar substantially parallel and adjacent thereto, a recess forming bar in each said groove slidably mounted therein and extending throughout the length of said casting space, each said bar having a die portion thereon extending longitudinally the entire length of said casting space and radially into said casting space to form recesses in the plate cast therein, said die portions being longitudinally tapered with the greater width at the bottom, and said recess forming bars being longitudinally tapered with the greater width at the top, said core grooves being tapered correspondingly to said bars, and a radially extending projection on each said recess forming bar extending toward said collar and said core, said collar and core each being formed with longitudinally extending recesses to receive said extensions, whereby limited relative longitudinal movement is permitted of said collar and said bars with respect to said core and with respect to each other.

3. A machine for casting stereotype plates with recesses in the back thereof comprising a core, a jacket surrounding the core in spaced relationship thereto to provide a cylindrical casting space with an open end, a collar surrounding the core for closing the other end of said casting space said collar being longitudinally movable with respect to said core for moving a plate in said casting space toward said open end, a margin bar extending radially across said casting space along 6 the length thereof to provide separated and spaced ends of a stereotype plate cast in the casting space, said core having a pair of grooves extending longitudinally thereof said grooves being positioned one on either side oi said margin bar substantially parallel and adjacent thereto, a recess forming bar in each said groove slidably mounted therein and extending throughout the length of said casting space, each said bar having a die portion thereon extending longitudinally the entire length of said casting space and radially into said casting space to form recesses in the plate cast therein, said die portions being longitudinally tapered with the greater width at the bottom, and said recess forming bars being longitudinally tapered with the greater width at the top, said core grooves being tapered correspondingly to said bars, said die portions and said bars being formed with edges nearer said margin bar which are substantially parallel thereto and inclined opposite edges giving said tapered formation to said portions and bars, and means interconnecting said core, collar and bars permitting limited relative longitudinal movement of said collar and bars with respect to said core and with respect to each other includin a limited longitudinally slidable connection between each bar and the collar, and a limited longitudinally slidable connection between each bar and the core, each said connection comprising a radially extending projection received in a longitudinally extending recess.

FRANK A. FOSTER.

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

UNITED STATES PATENTS Number Name Date 2,100,003 Foster Nov. 23, 1937 2,110,154 Huck Mar. 8, 1938 2,327,665 Peat Aug. 24, 1943 2,401,727 Foster June 11, 1946 2,430,334 Harless Nov. 4, 1947