US1722876A - Pump-action control for typographical machines - Google Patents

Description

1929. o. GQWOODHOUSE 1,722,375

'PUMP ACTfOW CONTROL FOR TYPOGRAPHICAL MACHINES Filed km. 26, 1928 5 Sheets-Sheet 1 IN VE/YTOK Ora/g6 Z aazflzawe A TTORNE I July 30, 1929. o. G. WOODHOUSE PUMP ACTION CONTROL FOR TYPOGRAPHICAL MACHINES Filed Jan. 26, 1928 3 Sheets-Sheet 2 ATTORNEY INVEN TOR. ///w;zy, Z/aaflawe 3 Sheets-Sheet ar y IgI ENTOR.

ATTORNEY July 30, 1929. o. G. WOODHOUSE PUMP ACTION CONTROL FOR TYPOGRAPHICAL MACHINES Filed Jan. 26, 1928 w ill lhlll Patented July 30, 1929.

UNITED STATES 1,722,876 PATENT OFFICE.

ORANGE G. WO ODHOUSE, 0F SYRACUSE, NEW YORK, ASSIGNOR TO INTERTYPE COR- PORATION,

OF NEW YORK, N. Y.,

A CORPORATION OF NEW YORK.

PUMP-ACTION CONTROL FOR TYPOGRAPHICAL MACHINES.

Application filed January 26, 1928.

The present invention relates to improvements in typographical machines and more especially to those of the general class shown and described in Letters Patent Nos. 436,531 and. d36,532 granted September 16, 1890, to O. lllergenthaler, wherein character-bearing matrices are stored in a magazine and delivered therefrom, under the control of a keyboard, and assembled in a line and justified and then presented to a mold into which molten metal is injected from a metal pot, thereby casting a slug or type bar an edge of which bears printing characters which are counterparts of the characters borne by the assembled matrices.

In the development of machines of this general class, there has been a demand for one capable of casting type bars the character-bearing faces of which are relatively large, and to enable such extended characterbearing faces of such type bars to withstand the pressure imposed upon them incident to printing therefrom, and especially when such type bars are subjected to the great pressure employed in dry-mat printing processes, it has been necessary to employ molds having cavities of relatively large dimensionsso that the bodies of the type bars will be sufficiently massive or strong to sustain the pressure imposed upon the printing face. ,7

However, owing to the relatively large dimensions of the cavities of such molds difliculty has been experienced in the casting of type bars therein which are free of large air holes or voids, it having been found that con'ipletc solidification of the metal compos ing the body of the type bar, especially the rear portion thereof, does not ordinarily take place within the allotted portion of the cycle of the operation of the machine, and consequently the portion of the injected molten metal which has notsolidified will be drawn back by the return stroke of the metal pump plunger which is ordinarily used to inject the molten metal and which, according to the usual practice, is operated on its return or suction stroke very quickly or within a very few seconds after the cast is made.

The object of the present invention is to provide means for overcoming the objections above referred to and to enable large bodied type bars to be cast which are solid or free of air holes, it providing means for momenmetal forming the type bar.

Serial No. 249,?25.

tarily checking or causing a pause in the operation of the machine when it reaches the casting period so that the operation of the metal pot plunger will take place through a relatively prolonged period of time which will be suflicient to insure complete evacuatron of air from the mold cavity and more complete solidification of the entire body of To these and other ends, the invention consists in certain improvements and combinations and arrangements of parts all as will be hereinafter more fully described, the features of novelty being pointed out particularly in the claims at the end of the specification.

In the accompanying drawings Fig. 1 is a perspective view of the means preferably employed for stopping or producmg a pause in the operation of the machine during the casting period, the same being shown applied to a line casting machine of Well known construction;

Fig. 2 is an elevation of a portion of the device shown in Fig. 1 as viewed from the right hand side thereof;

Fig. 3 is a detail sectional View of the usual line delivery and elevator transfer cam but'provided with a pawl or dog used in carrying out the present invention;

Fig. 4 is a rear elevation of the stopping device of the present invention as viewed from the rear of the machine, illustrating the manner in which the device stops the operation of the machine; and

Fig. 5 is a view similar to Fig.4 but showing the positions which the parts of the stopping device occupy immediately after the machine has been restarted.

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

The present invention is applicable generally to line casting machines of the class hereinbefore referred to, it being shown applied in the present instance to a line casting machine of a type which is well known and in extensive use, 1 representing a portion of the main column of the machine, 2 representing the main cam shaft thereof, 3 representing a portion of the so called line delivery and elevator transfer cam which is fixed on the main cam shaft 2, 4 representing a portion of the usual automatic stopping lever and 5 representing a portion of the usual vertical starting lever, commonly used on machines of this type, the vertical starting lever 5 being normally held by spring action in the position shown in Fig. 4 but being movable into the position shown in Fig. 5, against such spring action, in starting the machine, the automatic stopping lever 4 usually cooperating with a pawl a suitably positioned on the cam 3 to stop the'operation of the machine, and movement of the lever 5 into the position shown in Fig. 5 dislodging such pawl from the lever 1 and thus starting tho machine in accordance with the usual practice. 6 represents a portion of the usual metal pot pump lever which actuates the plunger inthe metal pot to inject the molten metal into; the mold after a line of matrices has been presented thereto, as is well known in the art, the metal pot lever being operated on its downward or metal injecting stroke by a spring and its time of operation and also its return stroke being controlled by acam-on the main cam shaft- 2, as is common in machines of this type.

reached and According to the present invention, an additional stopping-pawl 7 is mounted on the ca m 3 at a suitable angle around its circumference in rear of the regular stopping pawl 4}, it being arranged thereon so that it will come into position to act on the automatic stopping lever 4 immediately after the drop in the metal ot pump lever cam has been t hepump lever Ghas been released and has commenced its downward metal injecting stroke under the action of the actuating spring. This pawl is pivoted on a pin 8 which may be supported by lugs 9 on the hub of the cam 3 so that the outer or free end of the pawl may swing in the direction of the axis of the cam, and the pawlis normally held in the full line position shown in Fig. 3 and against an abutment 3 forming part of the cam, by a compressed spring10 which acts against a side of the pawl. The treeend of thepawl projccts beyonc the periphery of the cam 3, and

when the pawl is shifted into'the dotted line position shown in Fig. 3, it will be in a posi- .,tion to engage the top of the automatic stopping lever 4, as the cam 3 rotates in a clockwise direction in Fig. 2, and the consequent depression of the automaticstopping lever 4 will stop the operation of the machine by disengaging the main driving clutch, through the instrumentalities commonly used in machines of this type which connect the automatic stopping lever 4 to the mainclutch control. On the other hand,

when the pawl 7 occupies the full line positionshown in Fig. 3, it will clear the automatic stopping lever 4 and the machine will then operate in the usual way and the casting' operation will take place as usual or ":without a pause in the operation of the machine.

Means is provided for bringing the stopping device of the present invention into operation while .a mold having a large cavity for the casting of type bars having masmay be fixed to a plate 1 1, the latter being bolted or otherwise secured to the main column of the machine and serving to support the stopping mechanism thereon. I The rear end of the rod 11 is bent downwardly to form an arm 15 which occupies a position in front of the cam 3, and this arm is adapted to rest in one or another of a pair of forwardly and rearwardly spaced notches 16 and 17 formed in a bracket 18 which is fixed to the rear side of the plate 14, the arm being held in one or the other of these notches under the tension of a spring 19 one end of which may be connected to the arm 15 while its opposite end is attached to the bracket 13. Partial rotation of the rod 11' a by force applied to the handle 12 on its forward end will serve to disengage the arm 15 from either one of the notches, and the arm may be transferred from one notch to the other by shifting the rod 11 endwise while the arm 15 is held out of engagement with the bracket 18. lVhen the arm 15 rests in the forward notch 16, as is shown by the full lines in Fig. 2, it will occupy a plane forward of or beyond the end of the pawl 7 which projects from the periphery of the cam 3, and hence the pawl 7 will pass the arm 15 uninfluenced by it, but when the arm 15 rests in the rear notch 17, it will be in the path of the outer or free end of the paw 7, as is indicated by the dotted lines in Fig. 2, and as the cam 3 rotates to bring the pawl 7 toward the automatic stopping lever l, the

outer end ofthe pawl 7 will come into engagement with the adjacent side of the arm 15, and as the latter is inclined toward the automatic stopping lever 4 and is held in such position by the spring 19, the pawl 7 will be swung about its pivot pin 8 from the full line position to the dotted line position shown in Fig. 3, or from the dotted line position to the full line position shown in Fig. 4, so that when the'pawl reaches the full line position shown in Fig. 4, itwill be immediately above and in line with the automatic stopping lever 4 so that it will bear thereon and force this lever 1 downwardly, thereby causing the stopping mechanism actuated by the stopping lever 4 to disengage the main clutch and stop the operation of the machine. The arm 15 deflects the pawl 7 from the full line to the dotted line position, Fig. 3, against the action of the spring 10, the spring 19 which holds the arm 15 in position, being of superior strength.

into the mold is sufiicient to overcome While the pawl 7 rests on the stopping lever 4, the machine will be held from further operation, but during this pause in the operation of the machine, the metal pot pump lever 6 is descending to force molten metal into the mold to cast the type b ar therein, the cam controlling the operation of the pump lever 6 being in such position as to permit such operation of the pump lever without obstruction. The machine is again set into operation after the metal injecting operation has been performed, and such restarting of the machine, according to the present invention, is accomplished automatically and under control of the pump lever, so that the machine will not be restarted to cause the return stroke of the metal pump to take place until after a sufficient time has elapsed to effect evacuation of all air from the mold and complete solidification of the metal injected therein. In the construction shown, a lever 20 is pivoted at 21 on the plate 14, the free end of this lever extending beneath the pump lever 6 and being held in engagement therewith by a tension spring 22. This lever is formed, at a point near its pivot, with a shoulder 23 which is arranged opposite to the upper end of second lever 24;, the latter being pivoted a 25 to the supporting plate 14 and having a toe 26 on its lower end which is arranged to swing against the vertical starting lever The upper end of the lever 24 is preferably provided with an adjustable set screw 27 which is arranged to bank against the shoulder 23 on the lever 20, adjustment of this screw enabling the operator to vary the period of time during which the operation of the machine is interrupted during the casting operation to conform with the size of the body of the type bar to be cast. The pump lover 6 descends to inject metal into the mold under the action of a relatively strong spring, when the drop in the pump lever cam is reached during the rotation of the main cam shaft, the pump lever 6 descending under such spring pressure as the molten metal flows into the mold, and the pump lever cam has a rise which, during further rotation of the main cam shaft, comes into action to lift the pump lever 6 and thereby operate the metal injecting pump on its suction or return stroke, such parts being commonly used in line casting machines of the class to which the present invention is applied, the construction and mode of operation of the pump lever, metal injecting pump and pump lever cam being well understood so that illus :2- tion of such parts herein is believed to be unnecessary.

The strength of the spring which forces the pump lever 6 downwardly to inject metal tension of the spring 22 which maintains lever 20 1n contact wlth the under side of pump lever and to overcome the action of the spring which normally holds the vertical starting lever 5 in the position shown in Fig. l and to also overcome the tension of the spring 19 which normally holds the I arm 15 in the position shown in Fig. 4. While the pawl 7 acts immediately after engaging the automatic stopping lever l to disengage the main clutch and stop the op eration of the machine, there will be a retarded but continuel descent of the pump lever 6, due to the re lstance offered to the flow of the molten metal into the mold and the evacuation of air therefrom, so that while the drop in the pump lever cam has been reached and the pump lever cam has ceased to rotate, due to stopping of the machine, the pump lever 6 continues its descent while the machine is idle, and during the descent of the pump lever, the lever 20, which is always held against the under side of the pump lever by the spring 22 and begins to descend as soon as the pump lever begins to descend, is swung downwardly in unison therewith, thereby moving L126 shoulder 23 thereon toward and into engagementwith the adjacent end of the set screw 2?, and as the downward swing of the lever 2t) continues under the continued descent .of the pump lever 6, the lever 2% is swung from its normal upright position shown in Fig. toward the right sufficiently to bring the heel 2G thereon against the upright start ing lever 5 and to move the latter from the position shown in Fig. as) that shown in Fig. 5, and as the starting lever 5 occupies a position immediately beside the pa vi 7 which at this time rests on the automatic stopping lever l, the latter part of the swing of the lever 2% toward the right under the continued descent of the pump lever (5 and the interposed lever 20 will cause displacement of the pawl 7 laterally and toward the right until it clears the stopping lever l. As the disengagement of the pawl 7 from the stopping lever l and the actuation of the vertical starting lever 5 sets the machine again into operation, the pawl 7, which 1o-- tates with the cam 3, will pass at the right hand side of the stopping lever A, as is indi cated by the full and dotted lines in Fig. It will be understood that the arm 15 is pushed aside or laterally from the dotte-i line position. to the full line position in Fig. 5 during disengagement of the pawl 7 from the stopping lever i, the power of ti o spring which forces the pump lever 6 downwardly being sufficient to overcome the tension of the spring 19. After the 'am 3 has rotated to a position beyond the lower end of the arm 15, the latter returns to full line posi tion Fig. at or its dotted line position Fig. under the action of the spring 19 it then being in posi on to direct the pawl 7 on to the automati stopping lever during the neXt following casting operation, and the machine is automatically stopped upon completion 01 its cycles of operations by the engagement of the regular stopping pawl l with the stopping lever l and the associated stopping means usually employed in machines of this type. The adjustable screw 27 may be set to vary the period during which the operation of the nr chine is interrupted, as its adjustment serves to vary the stroke of the lever 24 under the action of the lever 20 so that the heel 26 will engage the starting lever 5 and dislodge the pawl 7 from the stopping lever at an earlier point in rolati on to the descent of the pump lever 6 when slugs of the relatively smaller sizes are being cast than wien slugs oi the largest size are being cast, it thus enabling the period oi rest in the operation of the machine to be varied according to whether molds having cavities of medium or large sizes are in use, and consequently, ample time will be allowed for sufficient descent of the pump lever to insure complete injection of metal into the mold before the machine is a, 'n started into operation, and the delay thus provided before the rise in the pump lever cam is reached and the metal injecting pump is operated on its return or suction insures the solidification oi' the entire body of metal forming the slug, so that no metal will be withdrawn or sucked out of the mold by the suction stroke of the pump.

The operation of the device is briefly as follows. During the normal operation of the machine using molds of the usual or standard sizes, the rod 11 is in its forward position and the arm 15 thereon is held in the forward notch 16 under the action of the spring 19. The arm 15 will then occupy the full line position shown in Fig. 2 and hence it will be beyond and out of the path of the end of the pawl 7 which projects radially beyond the periphery of the cam 3. The machine may thereforeoperate under the control of its usual stopping and starting means and without interruption during the casting operation. However, when type bars are to be cast in a recessed mold or other large body mold, the rod 11 is rotated in the appropriate direction, by its handle 12 to disengage the arm 15 from the forward notch 16 and the rod is then pushed rearwa-rdly and the arm 15 is allowed to enter the rear notch 17 under the tension of the spring 19. When the arm 15 is in this position, as shown by the dotted lines in Fig. 2, it is in the path of the end of the pawl 7 which projects beyond the periphery of th cam 3, and it will be held under the yielding action of the sprin 19 in the inclined posi tion shown in Fig. a, it sloping toward the automatic stopping lever l.

hen the machine is stared in the usual way by sending in an assembled line of matthe automatic stopping lever.

1,72ae7e rices, the cam 3 rotates in the usual manner from its normal or starting position shown in Fig. l in the direction indicated by the arrow in Fig. 2, the pawl 7 rotating with this cam. When the pawl 7 approaches the automatic stopping lever l, the right hand side of the pawl comes into contact with the inclined arm 15, as indicated by the dotted lines in Fig. 4, and as the rotation of the cam co. tinues, the pawl is deflected toward the left until its lower edge stril es the lug 4 of This obstruction momentarily checks further rotation of the cam 3 and simultaneously, the pressure of the pawl 7 on the automatic stopping lever causes this lever to "function in the usual manner to disengage the main driving clutch and to thereby arrest the operation of the machine. Immediately prior to the contact of the pawl 7 with the automatic stopping lever, the pump lever cam reaches a position where the drop therein releases tne pump lever to permit its descent under th action or the usual spring, and the pump lever tierefore descends to inject metal into the mold to cast the slug or type bar therein and to evacuate air from the mold. Descent of the pump lever 6 causes the lever 20, which engages its under side, to also swing downwardly, and the shoulder 23 thereon is thus caused to act on the end of the set screw 27 whereby the lever 24 is swung toward the right from the position shown in Fig. 4. The heel 26 of this lever is thereby brought against the left hand side of the spring control ed'lug 5 of the vertical starting lever,

and as the descent of the pump lever continues, the vertical starting lever is swung toward the right, causing it to contact with the pawl 7 and to force the pawl 05 its seat on the lug 1- of the stopping lever, this displacement of the pawl taking place in opposition to the tension of the spring 19. Inasmuch as the disengagement of the pawl 7 from the stopping lever 4 depends upon the descent of the pump lever 6, the pawl 7 will not become dislod cd from the stopping lever l until tl e pump lever has completed a deli nite length of stroke predetermined by the setting of the screw 27, and hence, by setting the screw 27 in contact with or at an appropriate distance from the shoulder 23 on the lever 20, the disengaging of the pawl 7 from the stopping lever l may be made to take place sooner or laterin the down stroke of the pump lever to conform with the dimensions of the cavity of the mold in use.

Immediately following the disengagement of the pawl 7 from the stopping lever 4c, the achine is rendered operative again, the au- "omatic stopping lever functioning in the manner usual in machines of this class to reengage the main driving clutch of the machine, and the restarting of the machine causes the cam 3 to rotate in the usual manner to complete the cycle of operations whereupon the machine is stopped in its regular normal position by the re-engagement of the stopping pawl i with the stop ping lever 4 and the stopping means actuated thereby commonly used in machines of this type for that purpose. The restarting of the machine, following disengagement of the pawl 7 from the stopping lever 4i, raises the pump lever 6 in the usual ianner by bringing the rise in the pump lever cam into action, and the spring 22 causes the lever 20 to follow the pump lever 6 and to remain in contact with it as it rises. The consequent upward swing of the lever 20 from the position shown in Fig. 5 to the position shown in Fig. 4 allows the lever 24 to return from the position shown in Fig. 5 to its normal upright position as shown in Fig. 4, under the action of the spring controlled vertical starting lever which returns it to its normal position as shown in Fig. 4, and as soon as the pawl 7 which advances with the cam 3, passes below the lower end of the arm 15, this arm is returned by the tension of its spring 19 to the position shown by the full lines in Fig. i, it then being in position to engage and deflect the pawl 7 during the neXt cycle of operations of the machine.

By stopping the operation of the machine immediately after the drop in the metal pot pump lever cam has reached the point where it releases the pump lever, the interval of time elapsing between the releasing of the pump lever by the drop in its controlling cam and the return stroke of the pump lever by the rise in the cam is prolonged or eX- tended, thereby affording a longer period than is usual for the descent of the pump lever which injects the metal into the mold and evacuates air therefrom, and the pause in the operation of the machine delays the time of lifting of the pump lever which operates the metal pump on its return or suction stroke, and hence a greater length of time is afforded prior to the suction stroke of the pump during which solidification of the molten metal injected into the mold may take place. The simple adjustment provided enables the duration of the pause in the operation of the machine to be readily varied to conform with the size of the cavity of the mold in use.

By extending the setting rod to the front of the machine and there providing it with a handle for operating it, the device provided by the present invention for interrupting or producing a pause in the operation of the machine during the casting operation may be rendered operative or inoperative nor-' mally by the operator, to accord with the size of the mold to be used, without requiring the operator to leave his usual position at the front of the machine.

I claim as my invention 1. In a typographical machine having starting and stopping means and casting means including a member controlling the metal-injection operation thereof, means for producing a pause in the operation of said member during the metal injecting operation.

2. In a typographical machine having starting and stopping means and casting means embodying metal injecting means and a member controlling the metal injecting operation thereof, means controlled by the operation of the metal injecting means for producing a pause in the operation of said controlling member during the metal injecting operation.

8. In a typographical machine having starting and stopping means and metal injecting cas ing means, means controlled by the casting means for stopping the operation of the machine after commencement of the metal injecting operation and for restarting the machine upon completion of such opera tion. v

4. In a typographical machine having starting and stopping means and casting means including a metal pot pump lever operative to inject metal into a slug casting mold, means operative to stop the machine after commencement of the metal injecting movement of said lever and to restart the machine under the control of said movement of said lever.

5. In a typographical machine having starting and stoppin means and ,a metal pot pump lever for inject-ing metal into the mold, means to cooperate with the stopping means for stopping the machine after said lever has commenced its metal injecting movement, and means actuated by said lever and 0p erative to automatically restart the machine when said lever reaches a predetermined point in its said movement.

6. In a typographical machine having starting and stopping means and a metal pot pump lever operative to inject metal into the mold, means carded by a part of the machine during its operation into cooperation with the stopping means to stop the machine after the pump lever has commenced its metal injecting operation, and means actuated by the pump lever and cooperative with the starting means to restart the machine automatically after the pump lever has operated to a predetermined extent.

7. In a typographical machine having starting and stopping means and casting means operative to inject metal into a mold, means driven by a part of the machine dur-' ing its operation for stopping the machine after the operation of the casting means has commenced, and means actuated by the casting means during its operation for restarting the machine, meansbeing provided for varying the duration of the pause in the operation of the machine.

8. In a typographical machine having starting and stopping means and casting means operative to inject metal into the slug casting mold, means operative to stop the machine after the casting means has commenced its operation, means controlled by the operation of the casting means for restarting the machine, and adjustable means for timing the operation of the last named means relatively to the operation of the casting means.

9. In a typographical machine having starting and stopping means and a metalpot pump lever operative to inject metal into a mold, a member driven by the machine during its operation and movable into engagement with the stopping means to stop the machine after the pump lever has commenced its metal injecting operation, an means controlled by the operation of thepump lever and operative to disengage said member from the stopping means and to restart the machine.

10. In a typographical machine having starting and stopping means and a metal pot pump lever operative to inject metal into a mold, a pawl driven by the machine during its operation and movable into engagement with the stopping means to actuate it to stop the machine when the pump lever is at the commencement of its metal injecting operation, and means operative by the pump lever during the metal injecting operation to actuate the starting means to disengage said pawl from the stopping means and to restart the machine.

11. In a typographical machine having starting and stopping means and a metal pot pump lever operative to inject metal into a mold, a member movable, during operation of the machine, into engagement with the stopping means to stop the machine when the pump leveris at the commencement of its metal injecting operation, a pair of levers, one operative by the pump lever during its metal injecting operation and in turn ac:- tuating the other lever of the pair to operate the starting means to disengage said member from the stopping means and to restart the machine.

12. In a typographical machine having starting and stopping means and a metal pot pump lever operative to inject metal into a mold, a member movable, during operation of the machine, into engagement with the stopping means to stop the machine when the pump lever is released to perform its metal injecting movement, a. pair of levers, one arranged to be actuated by the pump lever durin its metal injecting movement and the other arranged to actuate the starting means to restart the machine, and

adjustable means between said pair of levers 14. In a typographical machine having stopping means and casting means for injecting metal into a mold, a member movable, during operation of the machine, toward the stopping means, and means capable of being set in. one position to cause engagement of said member with the stopping means to stop the machine during the operation of the casting means and of being set in another position. to cause said member to pass the stopping means without engaging 15. In a typographical machine having stopping means and casting means for injecting metal into a mold, a pawl movably mounted on a partof the machine to be car ried, during operation of the machine, toward the stopping means, and an arm capable of being set in a position to deflect said 1 ember into engagement with the stopping means to stop the machine during the operation 01"- the casting means.

16. In a typographical machine having stopping means and casting means for inject-ing metal into a mold, a pawl movably mounted on a part of the machine to be carried thereby, during operation 01" the machine, toward the stopping means, means acting. on said pawl to manually hold it in a position to pass said stopping means, and an arm capable of being set in one position to allow said pawl to pass it while the pawl remains in a position to pass the stopping means and of being set in another position where it will deflect said pawl into engagement with the stopping means tov stop the machine during the operation of the casting means. I

17. In a typographical machine having starting and stop-ping means and casting means for injecting metal into a mold, a pawl movably mounted on a part of the machine to be carried thereby, during the operation of the machine toward the stopping means, means acting on said pawl to normally hold it in a position to idly pass the stopping means, an arm capable of bemg set in one position where it will allow said pawl to pass it while the pawl remains in a position to pass the stopping means and of being set in another position where it will deflect said pawl into engagement with the stoppin means to stop the machine, means for yieldingly holding said arm in'said latter position, and means operative by the casting means during its metal injecting operation to actuate the starting means and to disengage said pawl from the stopping means against the yielding action of said arm.

18. In a typographical machine having stopping means and casting means for injecting metal into a mold, a pawl movably mounted on a part of the machine to be carried into proximity to the stopping means during the period of operation of the casting means, an arm capable of being set beyond the range of movement of said pawl to allow it to pass the stopping means without engaging it and of being set within the range of movement of said pawl where it will deflect the latter into engagement with the stopping means to stop the machine, manually operative means arranged to be manipulated from the front of the machine for setting said arm in one or another of said positions.

In testimony whereof I have hereunto set my hand.

ORANGE G. WOODHOUSE.

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