US1972837A - Metal pump for typographical machines - Google Patents

Description

P 1934. R. H. TURNER 1,972,837

METAL PUMP FOR TYPOGRAPHICAL MACHINES Fil'ed June 14, 1953 2 Sheets-Sheet l INVENTOR Raqson; H 7222 729! ATTORN EY Sept. 4, 1934. R. H. TURNER 1,972,337

METAL PUMP FOR TYPOGRAPHICAL MACHINES Filed June 14, 1953 2 Sheets-Sheet v2 AT'i'ORNEY Patented Sept. 4, I934 METAL PUMP FOR TYPOGRAPHICAL MACHINES,

Ransom Turner, Little Neck, Long Island,

N. Y., assignor to Intertype, Corporation,

Brooklyn, N. Y., a corporationof New York Application June 14, 1933, Serial No. 675,848

In Germany June 15, 1932 16 Claims (01. 2.2-7oj The present invention relates to improvements in the metal injecting pump for the metal pot of'a line casting machine, and more particularly to that of the well-known class substantially shown and described in U. S. Letters Patents Nos. 436,531 and 436,532, granted September 16, 1890,

wherein the pump, actuated by 'a spring andunder the control of a rotary cam, forces a charge of molten metal out of the metal pot into a mold 10 to cast a type bar or slug against a composed line of character bearing matrices, the cam making one complete revolution for each cycle of ,operation of the machine and having its active surface concentric throughout, except for a recess or depression at one point in its circumference to permit the pump plunger to descend under the action of its spring at the proper time for making the cast. The pump plunger is normally held by the cam in raised or inactive position against the tension of its spring bya pump lever pivoted on the machine frame and carrying a roller on one of its arms which bears against the cam, the other arm of said lever being connected directly to the pump plunger rod, and since the Z5 roller, under the tension of the pump actuating spring, rides on the surface of the cam for the greater part of each revolution thereof or during the time the pump is inactive, the surface of the cam in pumps as heretofore generally used, is

subjected to considerable wear.

It is desirable, especially for casting large slugs, that the pressure of the pump spring be as great as possible in order that the metal will be injected with suflicient force into the mold, but under such increased pressure the wear of the cam would become excessive unless some means were provided to compensate therefor. Moreover, while returning the pump plunger to inactive or retracted position after .a metal injecting or casting stroke, considerable resistance is oifered to the rotation of the cam while stretching or resetting the pump spring through contact of the pump roller with vthe rapidly rising surface of the cam at the end of the recess or depression therein following the pump release a,

the pump controlling cam, both while sustaining the pump plunger means in inactive position'and while lifting or retracting the pump plunger means after the metal injecting .or casting stroke thereof. To accomplish these results, the present invention provides a plurality of rollers for sustaining the pump plunger means in inactive or retracted position, these rollers being so arranged that during the lifting or retracting of the pump plunger means, the rollers will successively come into action and each of the rollers will sustain a portion of the load imposed while in the act of stretching the pump spring or springs. The present invention also proposes arranging these rollers so that as the load imposed by stretching the pump spring or springs increases, there will be a compensatingincrease in the lever arm through which the successive rollers operate in contacting with the rotating, cam. The present invention further provides an arrangement whereby the spring pressure for injecting the metal into the mold can be appreciably increased to any extent desirable for producing slugs of large size and, notwithstanding the. supporting of the load resulting from such increased spring pressure on a. plurality of rollers, all of the rollers will be released simultaneously and thereby render the entire spring pressure acting on the metal pump .eifective for the metal injecting operation.

According to the present invention, the machine may be provided with a pump having one or several pump plungers, working in the usual metal pot, it being preferable if several pump. plungers are used, that each be provided with its own pumpspring. The invention however enables but one pump cam to be used, as is usual with machines of thisgclass, the rollers being arranged to run one behind the other on the same 1 cam.

To these and other .ends, the invention consists in certain improvements and combinations and arrangements of parts all as will :be hereinafter described, the features of novelty being pointed. out particularly in the claims at the end of this specification.

In the accompanying drawings:

Figure 1 is a side elevation of the casting mechanism of a line casting machine embodying the present invention;

' ent invention, the parts beingwshown in the position they occupy immediately before casting .operation., I a

Figure 4 is a side elevation of a part of the mechanism shown in Figure 3 but showing the parts in the position they occupy when the pump plunger is about to be lifted or retracted; and

Figure 5 is a top plan of part of the structure shown in Figure 3.

Similar parts are designated by the same reference characters in the different figures.

Referring first to Figures 1 and 2 which show the invention applied to casting mechanism wherein the metal pot is provided with a plurality of pump plungers and a corresponding plurality of pump levers and springs, each lever having its roller working against the control cam, l represents the metal pot which may be substantially similar in construction to that usedgenerally in line casting machines of the class referred to, it containing a pump comprising a pluralityof cylinders 2 and a corresponding plurality of plungers 3 reciprocable vertically therein, the pump cylinders communicating with a throat 4 leading to a mouth piece 5 adapted to be brought against the mold in which the type bar or slug is to be cast in the usual manner and through which the molten metal is injected into the mold by descent of the pump plungers 3. 'In the present case, three pump plungers are shown, and a corresponding set of three pumplevers 6, land 8 are provided, these pump levers being pivoted to rock on a common shaft or pivot 9 supported by a bracket 10 mounted in fixed position on the frame of the machine and one arm of each of these levers is pivotally connected to the actuating rod 11, 12 or 13 of the respective pump plunger, and such arm of each'of the pump levers is acted on by a tension spring 14 through a rod 15 so that these springs act to swing the respectivepump leverstion of molten metal from the metal pot into the mold. The other arms of the pump levers carry rollersfi '7 and 8 respectively, which are arranged to run, one behind the other on the cam 16 whch may be mounted on the main cam shaft 1'7 as usual iii-machines of this class, the periphery oractive surface of this cam being concentric throughout its extent except for a recess or depression 18 therein, this recess providing at its forward end a drop-off point 19 for the rollers to 'permit the metal injecting or casting operation of the pump, and providing toward its rear end an inclined surface 20 leading to the concentric periphery of the cam and with which the rollers cooperate to lift or retract the pump plungers. It

will-be understood that the cam makes one complete revolution in the direction of the arrow in shaped that these rollers are at increasing diswhich project laterally from its opposite sides and are'arranged to engage the under sides of shoulders 6 and 8 respectively, of the pump levers 6 and 8. As the cam rotates in the direction'of the arrow, the pump plungers connected to the --levers 6 and 8 will beheld inactive by the engagement of the stop lugs '7 beneath the shoulders 6 and 8 respectively, after the release point 19 onthe cam passes from beneath their respective rollers 6 and 8 and until the release point 19 passes from beneath the roller '7 of the pump lever '7, whereupon all of the pump plungers will be released simultaneously for the metal injecting operation.

When the cam rotates sufficiently far to bring the inclined surface 20 thereon'into contact with the roller 8 the pump lever 8 'on which this roller is carried will be rocked about the pivot or fulcrum point 9 to lift its respective plunger, immediately succeeding which the inclined surface 20 of the cam. will contact with the roller 6 on the pump" lever B and will rock the latter about the pivot 9 to lift the plunger connected to this lever, and upon further rotation of the cam, the

inclined surface 20 thereon will contact with the roller '7 on the pump lever '7 and will rock the latter in a direction to lift or retract the pump plunger connected thereto. The arrangement of the rollers is such that by the time the inclined surface 20 on the cam contacts with the roller 6 the plunger connected to the pump lever.8 will be almost completelylifted and the'pump spring for the lever 8 will be correspondingly" stretched nearly to its full tension so that the resistance offered'to'the rotation of the cami will be only that produced bya single pump spring. Similarly, by the time the inclined surface 20 on the cam contacts with the roller 7 on the pump lever '7, the pump plunger attached to the pump lever 6 will be almost completelyi lifted and its spring will have been brought substantially to full tension. Thus, each of the pump plunger's will be lifted orretracted by sucoessive contact of their respective rollers with the inclined'portion 20 on the cam in such a man 1- nor that the power of only one pump spring at a time must be overcome.

In addition to the successive contacting of the cam with therespective pump'rollers to lift the respective pump plungers and reset their tension g;

springs, it is to be noted that each successive "roller will swing in an are which is located further from the com'mon'fulcrum point 9 in the direction of the circumference of the cam so that the successive rollers will act through. lever arms of increasing lengths, resulting in a reduction of the load exerted by each roller on the cam, and while there are a plurality of rollers operating against the inclined rise in the cam as the latter rotates, the wear on the cam will not be increased iin proportion to the number of rollers.

In the embodiment of the inventionshown in Figures 3, 4 and 5, only'one pump plunger 3 is employed for the metal pump 2 in the metal pot 1 this single plunger operating by its descent to inject metal from the metal pot into'the mold in the usual manner, the operating rod 21 for the. plunger being connected to one arm of a single pump lever 22 which is pivoted to rock on the pivot pin or fulcrum 9, the controlling cam 16 1 having the drop off point 19 leading to the recess or depression 18 and the inclined rise 29 leading from said recess, being like that described in' connection with Figures 1 and 2, the pump lever being depressed to actua'tethe pump plunger on its metal injecting stroke by a tension spring 14" acting on a rod 15 which bears on the pump lever. In this embodiment of the invention, a plurality of rollers are provided for distributing the load of thepump spring against the cam, two of such 1 15 rollers 23 and 24 being'shown which are rotatably,-

mounted on a bracket orv carriage 25, this car riage being pivoted on the pump lever 22 by the the pump lever swings, this carriage 25 in'eifect forming the roller carrying arm of the pump lever. The pump lever isprovided with stop lugs- 27 which project. laterally therefrom, and the.

carriage is provided with stop lugs 28 to engage the stop lugs 27 and thereby limit the swing of the carriage in one direction about its pivot 26.

While the rollers 23 and 24 are in engagement.

neath the last roller 24, this roller beingshown about to be released in Figure 3. After the metal injecting stroke of the plunger has taken place, following the passing of the release point 19 on the cam beyond the rollers, the continued rotation of the cam brings the inclined rise 20 thereon into contact with the first roller 23 and therer by tips the carriage about its pivot 26 intovthe position shown in Figure 4, immediately following which both rollers 23 and 24 will bear againstv the inclined rise 20 on the cam during the early stages of lifting or retracting the pump plunger. As soon as the further rotation of the cam brings the first roller 23 onto the concentric portion of the cam, the continued rotation of the cam will cause the carriage 25 to rock about its pivot 26 on the pump lever so that the center of rotation of the second roller 24 will be carried to a point further away from the fulcrum point 9. of the pump lever. Such forced rotation of the carriage I125 will thereby increase the length of the lever arm between the fulcrum 9 and the second roller 24, so thatthe resistance against rotation of the.

cam during the last stage of stretching the pump spring will be correspondingly reduced. v

; The invention as applied in either of theembodiments hereinbefore described, has the advantage of distributing the load on the cam while. the pump is being retracted in such a way that I wear or disturbing the operating efliciency of the machine.

I claim as my invention: 1. A casting pump for typographical machines having at least one metal injecting plunger, and

a cam for controlling the operation of the pump, pump actuating means connected to the pump and carrying a plurality of rollers running simultaneously on the cam, and stops operative to hold said actuating means in retracted position and to effect full release of the total available actuating force of said actuating means and thereby start the pumping operation of the pump when the rearmost roller is released by the cam.

2. A casting pump according to claim 1 wherein said rollers distribute todifierent portions of said cam the resistance encountered thereby in retractingsaid pump actuatingmeans.

- 'EV-Acasting-pump according to claim 1. wherein :the pump comprises a plurality of pumpplungers, said pump actuating means comprises a pluralityof differentpump levers on which said rollers are carried, and said rollers run one behind the other on thesame cam, and said stops are operative to effect fullrelease of said plurality of pump. levers and thereby start the pumping strokes of said plungerswhen the rearmost roller is released by the-cam;

4. A casting pump according to claim 1 wherein the. pump is provided with a single pump plunger, said pump actuating means comprises a spring actuated pumplever having a carriage pivoted thereto for carrying said rollers, and astop is provided on the pump-lever to hold said carriage in a position which-causes the cam to operate on a lever arm; of increased length during the latter stages of 'tensioning of the pump lever actuating spring.

'5. In a typographical machine having a metal pot provided with a metal injecting pump, and a rotary cam having a depression therein for controlling the operation of the pump, spring operated actuating means connected to the pump and carrying a plurality of rollers simultaneously engaging thecam, one behind the other, and

means for preventing operation of the pump actuating means and 'for effecting full release eration of the pump when the rearmost of said rollers reaches the depression in the cam.

6. In a typographicalmachine having a metal pot provided with a metal injecting pump, and a rotary cam for controlling the operation of the pump, pivoted'spring operated actuating means connected to the pum -an carrying a plurality of rollers located thereon at different distances from the pivotal center of 'saidactuating means and engageable' withthe cam successively in the order of their distances "from said pivotal center, the roller nearest said pivotal center engaging the cam first.

7. In atypographical: machine having a metal pot'provi'ded with a metal injectingpump and a rotary cam having a depression therein: for controlling the operation of the pump, pivoted spring operated actuating means for'the pump carrying a plurality of rollers located atdifigerent distances from the pivotal center of the actuating means and engageable and disengageable with respect to the cam successively in the order of their distances from said pivotal center, and means for holding said actuating means from operation until the roller most distant from its pivotal center is released by the depression in the cam.

8. In a typographical machine having a metal pot provided with a metal injecting pump embodying a plurality of plungers, and a rotary cam for controlling the operation of said plungers, actuating means for the pump comprising a plurality of pump levers having a common pivot,'one

lever being connected to each pump plunger and each lever carrying a roller, and a spring for actuating each pump lever, the rollers of said pump levers being engageable with the cam at different distances from the pivotal center of the pump levers, and the lever carrying the roller most distant from said pivotal center having means for holding the other pump levers against tau! actuation until the cam releases said most dis-' tant roller. i

9. In a typographical machine having a metal pot provided with a metal injecting pump embodying a plurality of plungers and a rotary cam for controlling the operation of said plungers, actuating means for the pump comprising a plurality of pump levershaving a common pivot, one lever being connected to each pump plunger and each lever carrying a roller, and a spring for actuatingeach pump lever, the rollers of said pump levcrsbeing engageable with the cam at difierent distances from the pivotal center of the pump levers, and the lever carrying the roller most distant fromsaid pivotal center having stop lugs thereon to engage, other of said pump levers and thereby hold them against actuation until the cam releases said most distant roller.

10. In a typographical machine having a metal pot with a metal injecting pump therein, and a rotary cam for controlling the operation of said sump, a pump lever carrying thereon a plurality of rollers simultaneously engaging said cam, and means for preventing the operation of the pump until the cam disengages the last one of said rollers.

11..In a typographical machine, the combination of a metal pot, a pump plunger therein, a spring actuated operating lever therefor, a rotary cam for controlling said lever, and a plurality of rollers carried on said lever and engageable with said cam, said rollers engaging said cam simultaneously at different points during the rotation of said cam to correspondingly distribute the load of the pump spring thereon.

12. In a typographical machine having a metal pot and a metal injecting pump, a rotary cam for controlling said pump, and a pivoted pump lever carrying a plurality of rollers thereon at increasing distances, in the direction of rotation of said earn, from the pivotal point of said lever, said rollers being engageable with the pump retracting portion of said cam successively in the order of their increased distances from the pivotal point or" said lever, the roller nearer said pivotal center engaging the cam first.

13. In a typographical machine having a metal pot provided with a metal injecting pump embodying a plunger, and a rotary cam for controlling the operation of said pump plunger, actuating means for the pump comprising a pivoted pump lever connected to said plunger, a spring for actuating said lever, and a member pivoted on said pump lever and carryinga plurality of rollers located at diiferent distances from the pivotal center of the pump lever and engageable successively by the cam, said member being swingable about its pivot on the pump lever under the action of the cam on said rollers in retracting the pump plunger to increase the distances of said rollers from the pivotal center of the pump lever.

14. In a typographical machine having a metal pot provided with a metal injecting pump embodying a plunger, and a rotary cam having a depression therein for releasing the pump, actuating means for the pump comprising a pivoted pump lever connected to said plunger, a spring for actuating said lever, a memberpivoted on said pump lever to swing relatively thereto and carrying a plurality of rollers located at different distances from the pivotal center of the pump lever and engaging said cam one behind the other, and stop means for limiting the swing of said member in one direction relatively to said pump lever to hold the latter in retracted position until the roller most distant from the pivotal center of the pump lever is released by the depression in the cam, said rollers being engageable successively with the cam beyond said depression and operative to swing said member in a direction to increase the distance of the rollers thereon from the pivotal center of the pump lever while the cam is acting on said rollers to retract the pump 105 lever.

15. The combination, with casting mechanism for typographical machines having metal injecting means and retractable actuating means therefor, of control means for said actuating means comprising a single rotatable cam, a plurality of cooperating rollers operatively associated with said actuating means, and means for distributing the load of retracting said actuating means to different portions of said cam.

16. Casting mechanism for typographical machines, which comprises metal injecting means, releasable and retractable actuating means therefor, control means for said actuating means including a single rotatable cam and a plurality of 120 cooperating rollers each operative to assist in retracting said actuating means, and means forcausing the full release of said actuating means at a predetermined point in the rotation of said cam. 1

I RANSOM H. TURNER.

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