US1515084A - Stereotype-plate-casting machine - Google Patents

Description

o. WOHLRABE ET AL STEREOTYPE PLATE CASTINGMACHINE Filed May 12, 1924 Fg. 4 Fig Saxony,

ing of the me necessary to 5 plate casting-machines has been w mantle must be overcome erren STEREOTYPE-PLATE-GASTING meam i Application med ma 12, 1924. Serial m. 712.785.

To all whom z't may camera Be it known that we, O''ro WOHLRABE and VIGTOR STEPHAN, both citizens of the German Republic, and residents of Plauen, Germany, have invented certain new and useful Improvements in Stereotype- Plate-Casting Machines, of which the following is a specification.

Our inventon relates in general to stereo- W type-plate casting-machines, but more especially it relates 'to the casting-mould for or of such machines; one part of our invention concerns the introduction of the metal into the mould; another part concerns the retainltherein, i. e. a -closing devce for the mould, and a third part concerns certain means for actuating this device, as is all fully described hereinafter.

Before entering into details we deem it give certain introductory explanations in order to facilitate comprehending the 'st of the invention immediately it has een disclosed Hitherto the mould for or of stereotypearranged either vertically or .horizontally. The object in the first case was to' utilize the advantage that the mantle of the mould can be easily moved o& the casting core, as no weight-work is required therefor. But the advantage is more or less compensated for by the disadvantage that it is necessary to run the casting metal into the mould from the -upperfrontal side thereof whereby a lost 3 or dead head is produced and the necessity s entailed' to mend considerably the printing jplate.

In the mending can be obviated by causing the 4%@ metal to' run into the mould at a narrow longitudnal side thereof, but then the necessity arisesto lift the mantle towards the core, when the mould is to be closed., that the prettyconsiderable weight of the bya corresponding expenditure of power and work.

Another drawback common to known arrangements consists therein that .the casting metal enters into the mould.

the case of horizontal casting moulds all these such a way that the air contained in the mould must try to find its way outwards along the surface of the flowing-in metal because this latter rushes into the mould from ,above in the entire breadth thereof. It tlen 'occurs oftentimes that more or less large air-bubbles cannotescape prior to the metal solidifying, whereby the casting is rendered porous.-

Now, in order to obtain and combine the advantages oflered by the knownarrangements, but to obviate at the same time the disadvantages or drawbacks thereof, we have so devised the casting-mould (which may be a vertical or a horizontal one) that the metal can be run thereinto simultaneously at its two small or narrow longitudnal sides, whereby the following advantages are obtained:

First of all the mould in two separated currents, between which the air can escape easily in upward direction without having any tunity to form pores in the metal. And as regards the product, printing plates can be, and are, produced which do not require any mending, such, for instance, as the .turning ofl of a lost or dead head. In the case of the employment of vertical moulds the advantage may be utilized that 'ture of work worth mentionin is required to Convey the ladle to the mou d.

But what has been stated two paragraphs relates 'only to a part of our invention. Another' part relates to .means for `closing in .proper time the communication between the ladle and the mould, the intention being to keep liquid the metal at this particularly sensitive part of the machine while this latter is in o eraztion, or,

in other words, to prevent it m cooling no expendiopporin the preceding down in the interval of time between two u caste, that is to say, during that time which the printing-plate cast solidifies. That occurs easily if rotary slides: or l'ngitudinal slides are employed-as closing means for the mould, the 'liquid metal then remaina ing' in the simply-channel in the proximity* of the plate just ast The employment of those kinds of slides, or mould closing means respectively, is the cause of many interruptions .of service, and besides, the life of the casting machine is Shortened and finishing the printing plates is retarded.

We have devised means to overcome the just mentioned drawbacks; the object proper of these means (which are fully described hereinafter) is to force back the metal remaining in the supply-channel after the casting-mould has been closed; in other words: that metal is removed from the proxmity of the mould until the printingplate cast has solidified. That procedure s' the more desirable as then the first metal particles arriving at the mould at the next casting operation get thereinto in hot and liquid state and are thus able to fill up the minute cavities of the matrix, as necessary.

We attain the object now in view by using specially devised valve-pistons instead of the usual ro-tary or' longitudinally movable slides, those pistons closing the mould in such a manner that the superfluous metal ing said channel.

is forced back into the ladle, as will appear more distinctly from the detailed part of this specificatin following.

Our invention is illustrated by way of example in the accompanying drawing in which Figure 1 is a horizontalsection of the supply channel provided to conduct the liq- 'uid metal into the mould; in other words:

it is a horizontal section of the parts form- Figure 2 is a front-view of a valve-piston as mentioned above. Figure 3 is a vertical section of this piston in line C-C of `Fig. 4. Fig. 6

the plane A-A of Figure 1. Figure 4 is a vertical section of certain parts of a Stereo type plate casting machine which are shown in order to facilitate Understanding the invention; the plane of section is B-B of Figure 1, and the figure' is drawn on a reduced scale. Figure 5 is a diagrammatic illustration of the driving rods for two valve-pistons of the kind in question, according to is a section through the machine according to line D- D of Fig. 4.

The casting mould consists in known manner of a core 1 and a mantle 2, between which a space corresponding to the shape of the i printing plate tobe cast is left. The core i and the mantle are provided with jackets through which cooling water or another suitable cooling liquid is caused to flow.

The ,matrix is held fast at the mantle by a -lock 3. The casting mould shown by way of example is a vertical one (Fig. 4) and the mantle is therefore, swingable on a vertical axis. The casting. metal shall be conducted into the above-mentionedspace at the two small or narrow longitudinal sides or surfaces of the mould where suitably shaped slots are provided for this purpose. These slots communicate with slots 4 and 4' (*Figs.`

^erted on the piston by the the piston which forms a 1, 4 and 5). The mould is thus filled uniformly and 'quickly and the casting produced is of excellent quality, requiring no mending whatever.

The position of the slots or passages 4 and 4' with respect to the hasin or melting pot 5 containing'the liquid metal appears from Fig. 5, in which the side walls of the basin are indicated by dot-and-dash lines, as shown. Concerning the casting mould, the position of the supply-channels is shown best in Fig. 4. The core of the mould communicates with the basin or'melting pot 5 through an intermediate member 6. There are two such members, one on either side of the two small or narrow longitudinal sides of themould, and in each thereof two communicating recesses are provided, of which one forms the passage 4 and the other serves as space for the reception ofthe valve-piston 7 Each of these pistons, of which there are two (Fig. 5), is formed by a cylindrical body having a conical frontal head, as shown in the lefthand part of Figure 1. One side of the piston is flattened, as at 8, Fig. 1; the rear end of the piston is flattened at four sides (Fig. 3) and a slot is milled thereinto for the reception of the end of a connecting rod 9 by which the piston is reciprocated as hereinafter described. The piston and the connecting rod are connected with each other by a bolt 11 (Fig. 3) and by a 'pin 10 securing the bolt in its position in the piston.

The milled slot provided in the piston for he iunction thereof with the onnecting rod is at its inner end shaped obliquely as indicated by the lines 12 and 12' in Fig. 5, the purpose being that one side of the piston is able to take up fully the lateral pressure exconnecting rod when the mould is closed. a

Opposite the conical end 'of the piston 7. or 7' respectively, the member 6 is recessed correspondingly so that there is nearly no clearance when the piston has arrived at the end of its path, the liquid metal being then forced away out of the valve space nearly completely into the basin or pot 5 through the channel 4.

The flattened side of the piston, or of each of the pistons 7 and 7 respectivelyfls just over the matrix lock 3 behind which is a cavity 21 into which extends a projection of part of the guiding me ns for the piston.

The metal supplv channel 4 terminates in front of the conical end of the piston so that 4 channel 4 during this movement .of the piston, and remaining therein until the next casting operation proceeds, remains liquid and will again flow briskly into the space in front of the iston as soon as this latter is withdrawn, t ere being now no risk what ever that that metal will solidify prematurely, i. e. before the' Valvepiston is withdrawn. v V

In order to control the two Pistons re*- liably from a common point, we prefer to make use of the arrangement and combination of parts shown in Fig. 5, in which either iston is connected by a rod 9, or 9' respectvely, with a bell-crank lever 16 16, or 15"/16" respectively, the two levers being connected with each other by a rod 17. The bell-crank lever 15716' has a third arm 18 to which is hinged a rod 19 by which the bell-crank levers are turned in the appropriate point of time from the position shown in full lines into that indicated by dotted lines, and eversely. In other words: The

bell-crank levers 15716' is turned into the position 15"/16", and the bell-:crank lever is turned into the position l /l It ap'- pears from Fig. 5, that the members 9 and 15 on one side, and the members 9' and 15' on the other side, co-operate like togglelevers so that the closing-motion of the` pistns 7 and 7' is efl'e'cted with a considerable power.

We claim:

1.` In a stereotype-plate casting machine, in combination: a casting mould having small longitudinal walls on opposite sides,

and members having metal supply channels terminating at said walls.

2." In ,a stereotype-pl-ate casting machine,

in combination, a vertical casting mould having narrow longitudinal walls on op- A posite sides, and members having metal supply channels terminating at'said walls.

3. In a stereotype-plate casting machine, in combination: a casting mould having small longitudinal walls on opposite sides,

and members having metal supply channelsterminating at said walls; a member located in front of each mould-supply channel and forming a space communic ting 'therewith and extending practically at right angles thereto; a' valve-pisten arranged to reciprocate in' saidspace and having a flattened side arranged to slide over the inlet aperture to the mould-supply channel; and a main supply passage also provided in said latter member and terminating in :front of said,pisten-valve,substantially' as set forth.

4. In a stereotype-plate casting machine,`

in combination, a vertical casting' mould having narrow longitudinal walls on opposite sides, and members 'having metal supply channels terminating a`t saidwalls;

'a member located in front of each mouldsupply channel and forming a space communicating therewith and extending practic-ally at right angles thereto; a valve-piston arrangedto reciprocate in said space and having a flattened side arranged to slide over the inlet aperture to the mouldsupply channel; and a main supply passage also provided in said latter member and terminating in front of said piston-valve, substantially as set forth.

5. In a sterotype-plate casting machine, in combination: a casting mould having small longitudinal walls on opposite sides, 4

nected with each of the two valve-pistons which are arranged to move in opposite directions; a rod oonnecting the free arms of said levers with each other, and means for actuating the said valve pistons by the intermediary of the said levers as set forth.

6. In a stereotype-plate casting machine,

in combination: a casting mould having small longitudinal walls on opposite sides,

and members having metal supply channels terminating at said walls;` a member located in front of each mould-supply channel and' forming a space communicating therewith and extending practically at 'right angles thereto; a valve-piston arranged to reciprocate in said spaceand having a flattened side arranged to slide over the inlet aperture to the mould-supply channel, and having at its opposite end a recess having an oblique inner end wall and' being ,adapted to recei've the end of a connecting-rod attached to said valve-pisten in said recess, and means to actuate this'rod; anda main supply pasrage also provided in said latter member and terminating in front of said pistonvalve, substantially as set forth.

7. `In a stereotype-plate casting machine, in combination, a vertical casting mould having narrow' longitudinal walls on opposite sides, and' members having metal supply channels terminating at said walls;

a member located in front of each mouldsupply channel and forming a space com-` municating therewith and extending practically at right angles thereto'; a 'valve-pis- 'ton arranged to reciprocate in said space and having 'a flattened side arranged to' slide over the inlet aperture to the mouldsupplychannel, and` having at its opposite :end a recess having 'an obliqu inner end wall and being adapted to receive'the end of a connecting-rod; a connecting-rod atsaid valve-pstons by the intermediary of tached to said valve-piston in sad recess the said levers, as set fOI'th. V thereof; a bell-crank lever connected with In testmony whereof we aifix our signaeach of the two connecting rods; a rod contures. a

5 meeting the free arms of' said levers with e OTTO WOI-ILRABE. each other, and means for actuating the VICTOR STEP'HAN.

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