US2220410A - Typographical slug casting machine - Google Patents

Description

NOV. 5, 1940. p m s 2,220,410

TYPOGRAPHICAL SLUG CASTING MACHINES Filed June 2, 19:59 5 Shets-Sheet 1 INVENTOR Nov. 5, 1940. e. 'P. KINGSBURY TYPOGRAPHICAL SLUG CASTING MACHINES Filed June 2, 1939 5 Sheets-Sheet 2 k [N VEN TOR A RNE Y8.

NOV. 5, 1940. P, KINGSBURY 2,220,410

TYPOGRAPHICAL SLUG CASTING MACHINES Filed June 2, 1939 5 Sheets-Sheet 3 I "Az z wezvm'a.

11v VENTOR Nov. 5, 1940. G. P. KINGSBURY TYPOGRAPHICAL SLUG CASTING MACHINES 5 Sheets-Sheet 4' Filed June 2, 1939 IN VENTOR A TT RNE Y6;-

Nov. 5, 1940. e. P. KINGSBURY TYPOGRAPHICAL SLUG CASTING MACHINES Filed June 2, 1939 5 Sheets-Sheet 5 I INI ENTOR w E i A T RNEYS,

Patented Nov. 5, 1940 UNITED STATES PATENT OFFICE George P. Kingsbury, Hollis, N. Y., assignor to Mergenthaler Linotype company, a corporation of New York Application June 2,, 1939, Serial No. 276,947

21 Claims.

This invention relates to typographical slug casting machines of the general organization represented in U. S. Letters Patent No. 436,532 to O. Mergenthaler, wherein circulating matrices are 5 released from a storage magazine in the order in which their characters are to appear in print and assembled in line, the composed line transferred to a transporter or so-called first elevator which then descends to position the line before the face of a slotted mold carried by a rotatable disk mounted on the forward end of a fore-and-aft mold slide, the slide advanced until the front face of the mold is just short of metal tight engagement with the rear face of the composed line of matrices, and a metal pot rocked forwardly about its pivotal axis to press the mouthpiece thereof against the rear face of the slotted mold and to advance the mold slide the slight remaining distance necessary to press the front face of the slotted mold against the rear face of the composed line of matrices to complete the so-called lock-up. Molten metal is then injected by a pump from the metal pot through the mouthpiece and into the mold slot or cavity to form a type bar or slug against the matrices which produce the type characters thereon, and the matrices are thereafter elevated and returned through a distributing mechanism to the maga- Zine from whence they started.

In these machines, the advance of the mold slide is usually effected by a rotatable cam through the medium of a non-yielding train of connections; and the tilting movement of the metal pot about its pivotal axis is likewise effected by a rotatable cam but through the medium of a train of connections including a powerful spring which is compressed when the mouthpiece of the metal pot is pressed against the rear face of the mold to exert the necessary lock-up pressure on the parts during the slug casting operation.

As is well understood in the art, however, the transporter as it descends to position the line before the face of the slotted mold must be arrested at a predetermined level so that the aligning ears of the matrices will bear a definite relationship with the cooperating aligning ribs of the mold. In consequence, if the transporter is arrested at an improper level, the face of the mold collides with the aligning ears of the matrices 0 as the mold slide is advanced by its actuating cam, and since the train of connections between the mold slide and its actuating cam is non-yielding, considerable damage may result. Furthermore, the damage which may thus be caused is frequently augmented as the metal pot is thereafter tilted forwardly by its actuating cam, since under such conditions, the pressure of the compression spring which tends to force the mold slide forwardly to complete the lock-up is greatly increased.

To avoid these objections, it has already been proposed to include in the train of connections between the mold slide and its actuating cam a member which will yield in the event the advance of the mold slide is interrupted and which will act automatically to stop the machine before the metal pot is rocked forwardly about its pivotal axis. Such arrangements, however, are unsatisfactory for the reason that, when the machine is so stopped during a cycle of operation, the operator must first go to the rear of the machine to turn it back by hand, and then return to the front of the machine to remove or rectify the condition which lead to the trouble before he can restart the machine to complete the cycle of operation.

In accordance with the present invention, a train of connections having a member which yields when the advance of the mold slide is interrupted is interposed between the slide and its actuating cam in the manner heretofore suggested, but instead of stopping the machineunder such conditions, means are provided for automatically decreasing the normal advance of the metal pot about its pivotal axis so as to prevent the mouthpiece thereof from being pressed against the rear face of the arrested mold. The means preferably employed for this purpose comprise a lever having two members interposed between the metal pot and its actuating cam. These members are pivotally mounted at their upper ends on a common axis, and one of the members at its lower end is provided with a roller which tracks on the metal pot actuating cam, the other member at its lower end being connected to the metal pot through the usual heavy compression spring. Under normal conditions, these lever members swing forwardly as a unit about their common axis as the cam rotates, being maintained in such spaced relation that the metal Y pot is tilted forwardly about its pivotal axis to its normal foremost position to establishthe required metal tight lock-up between the mouthpiece, mold, and composed line. In the event, however, that the advance of the mold slide is in- 0 terrupted, a gap is created automatically between the two pot lever members, and until the member carrying the roller has been swung forwardly about its pivotal axis through this gap, .the other member and the pot connected there- K? to remain stationary. Thereafter, however, the two members swing forwardly as a unit and so ,tilt the metal pot forwardly about its pivotal axis, but due to the lost motion thus created the disance the metal pot it tilted forwardly is decreased to the desired extent. With this arrangement, the machine is allowed to complete its cycle uninterruptedly, and the operator can easily remedy or remove the cause which prevented the normal advance of the mold disk without the time consuming task of going to the rear of the machine and backing it up by hand.

For a detailed description of the invention, reference may be made to the accompanying drawings wherein it has been shown merely in preferred form and by way of example and as applied to the machine of the class stated, but obviously many changes and variations may be made therein and in its mode of adoption which will still be comprised within its spirit. It is to be understood, therefore, that the invention is not limited to any specific form or embodiment except insofar as such limitations are specified in the appended claims.

Referring to the drawings:

Fig. 1 is a side elevation, partly in section, showing a typographical slug casting machine embodying the present invention and the positions assumed by the various parts under normal conditions of operation just prior to the advance of the metalpot about its pivotal axis;

Fig. 2 is a side elevation, partly in section and on a larger scale, showing in detail the improved mechanism for advancing the mold slide and for rocking the metal pot about its pivotal axis;

Fig. 3 is a similar view, showing the position assumed by the various parts of the improved mechanism when the normal advance of the mold slide is interrupted and before the actuation of 40 the metal pot lever by its cam;

Fig. 4 is likewise a similar view, but showing the position assumed by the various parts of the improved mechanism when the normal advance of the mold slide is interrupted and after the actuation of the metal pot lever by its cam;

Fig. 5 is a plan view taken along line 5-5 of Fig. 4;

Fig. 6 is a rear View of the parts shown in Fig. 1 but with the actuating cams removed; and

Fig. '7 is a plan view taken along line 1-1 of Fig. 6.

In the operation of these machines, as is well known in the art, a composed line of character bearing matrices It is delivered into a transporter or so-called first elevator II, which then descends to position the line before a slotted mold I2 carried by a rotatable disk It mounted on the forward end of a foreand-aft mold slide I4 (see Fig. l). The matrices commonly employed are provided with two superposed characters, the upper one usually being roman and the lower one italic. When it is desired to cast a type line or slug against a composed line of the upper or roman characters, as is more usually the case, the matrices are delivered into the transporter II at the lower of two levels, and the transporter is caused to descend to its lowermost level, as determined by the engagement of an adjusting screw I 5 carried thereby with the upper face of a vise frame I6, to position said line of characters in registration with the mold slot and with the lower rear aligning ears I? on the matrices in registration with the lower aligning groove I8 on the front face of the mold. On the other hand, 75 when it is desired to cast a type bar or slug against a composed line of lower or italic characters, the matrices are likewise delivered into the transporter II at the lower of the two levels,

but the transporter II as it descends is arrested by the engagement of the adjusting screw I5 with the top face of an interponent or filler piece (not shown), which in the meantime was swung into operative position atop the vise frame I6, to position said line of characters in registration with the mold slot and with the lower rear aligning ears I! in registration with the upper aligning groove I9 on the face of the mold. When the matrices are delivered into the transporter at both levels, as they are when the composed line comprises both upper and lower characters, the transporter II as it descends is arrested as before at its lowermost level to bring the aligning ears I! on those matrices assembled at the lower level opposite the lower mold aligning groove I8 and the aligning ears IT on those matrices assembled at the higher level opposite the upper mold aligning groove I 9.

After the transporter II descends to its proper level, the mold slide I4 carrying the mold disk I3 is advanced until the front face of the slotted mold I2 is just short of metal tight engagement with the rear face of the composed line of matrices I0, the aligning ears I1 on the matrices entering the aligning groove IE or I9 on the face of the mold. Thereafter, a metal pot 2 I, pivotally mounted at its front end on a supporting rod 22, is rocked forwardly about its pivotal axis to press the mouthpiece 23 thereof metal tight against the rear face of the slotted mold I2 and to advance the mold disk I3 and slide I4 the extremely slight remaining distance (about .005") necessary to press the front face of the mold metal tight against the rear face of the composed line to complete the so-called lock-up.

Should the transporter II, as it descends to position the composed line to the mold, be arrested at an improper level, the mold as it is first advanced by the mold slide I4 would collide with the aligning ears I! on the matrices, and then the metal pot 2|, as it is thereafter rocked forwardly to complete the lock-up, would also tend to force the mold slide forwardly and so add to the force exerted by the front face of the mold against the aligning ears on the matrices.

To avoid damage to the matrices, as well as to other parts of the machine, in the event the forward movement of the mold slide I4 is thus arrested, the train of connections leading from the mold slide !4 to its actuating cam 25 is adapted and arranged to yield under such conditions, and means are provided which operate automatically to shorten the forward movement of the metal pot 2| about its pivotal axis so that the mouthpiece 23 will not press against the rear face of the mold I2.

Accordingly, the connections between the mold slide I4 and its actuating cam 25 comprise a lever having two members 21, 28 of different lengths and pivoted together at their lower ends. The long member 21 is pivoted at its upper end in the main frame of the machine, as at 29, and it is provided with a roller 32 positioned in the usual groove or raceway 33 formed in the side face of the cam 25. The short member 28 carries a roller 34 positioned in the usual notch or recess 35 formed in the rear end of the mold slide I l, and at its upper end it is maintained in spaced relation from the long member 21 by a compression spring 36 positioned about an adjustable stud 31 which projects through aligned openings in the two members 21, 28. By this arrangement, when the transporter descends to its proper level, the normal forward movement of the mold slide I4 is effected by the cam 25 through the medium of the long and short members 27, 28 and the interposed spring 36, all of which, under such normal conditions, swing forwardly as a unit about the axis 29 of the long member 21. In the event, however, that the normal advance of the mold slide i4 is interrupted, the spring 36 yields and so allows the short member 28 to swing rearwardly about the roller 34 as an axis while the long member 27 completes its forward movement (see Figs. 3, 4 and 7).

Referring nowto the connections between the metal pot 2| and its actuating cam 26, these comprise a lever having two members 40, 4| of unequal lengths and mounted at their upper ends on a common pivot rod 42 carried by a pair of brackets 43, 44 which project from the rear wall or" the metal pot 2|. The short member 46 at its lower end is provided with a roller 48 adapted to track on the periphery of the cam 26, and the long member 4| at its lower end is connected to the metal pot 2| through the medium of a heavy compression spring 5| The short member 40 is also provided with a pair of hardened plates 55, 5| positioned on opposite sides of the roller 48 and adapted to cooperate with high and low portions 64 and 16, respectively, of a pair of collars 52, 53 secured to a rock shaft 54 mounted transversely in the long member 4|. The rock shaft 54 carries a bell crank lever 55 having a pin 56 which projects laterally therefrom in front of 2. lug 51 formed on the lower end of a rocker arm 58. This rocker arm 58 is pivoted to the long member 21 of the mold slide lever and by force of gravity tends to assume a vertical position with its upper end against the rear end of an adjusting screw 59 carried by a bracket 60 secured to the short member 28 of the mold slide lever.

Under normal conditions, the high portions 54 of the collars 52, 53 are located immediately in front of the hardened plates 55, 5|, being maintained in such position by the banking of a shoulder 62 formed on one of the collars against a stop pin 63 on the long member 4! of the metal pot lever under the influence of a pull spring 6| which, by its connection to the bell crank lever 55, tends constantly to rotate the rock shaft 54 in a clockwise direction. Hence, when the advance of the mold slide 14 is uninterrupted, the two members 40, 4| of the metal pot lever swing forwardly as a unit about their common pivotal axis 42 and the metal pot 2| is rocked forwardly about its pivotal axis 22 to its normal foremost position to complete the lock-up, at which time the spring 5| is heavily compressed to maintain the requisite lock-up pressure (see Fig. 2) The mold slide I4 having advanced to its normal foremost position, the rocker arm 58 carried by the long member 21 of the mold slide lever is rendered ineffective, leaving the collars 52, 53 in their normal setting.

When, however, the advance of the mold slide I4 is interrupted and the short member 26 of the mold slide lever swings rearwardly about the axis of the connecting roller 34 while the long member 21 completes its forward movement, the rocker arm 58 is rotated counterclockwise, and, through the engagement of the lug 57 with the pin 56 on the bell crank lever 55, rotates the rock shaft 54 counterclockwise against the action of the pull spring 5| to carry the low portions 10 of the collars 52, 53 in front of the hardened plates 50, 5| (see Fig. 3). In consequence, when the short member 46 of the metal pot lever is thereafter forced forwardly about its pivotal axis 42 by the actuating cam 26, the long member 4! remains undisturbed until the short member 46 has been swung through the gap thus created between the hardened plates 56, 5| and the low portions 10 of the collars 52, 53 (see Fig. 4). Thereafter, however, the two members 4|], 4| swing forwardly as a unit about the axis 42 and the metal pot 2| is rocked forwardly about its pivotal axis, but due to the lost motion just referred to, the advance of the metal pot 2| is correspondingly decreased. The extent of the gap between the hardened plates 50, 5| and the low collar portions 10 is so regulated that the advance of the metal pot 2| is decreased sufiiciently to avoid any pressure contact between the mouthpiece 23 and the rear face of the arrested mold it while the machine completes its normal cycle of operation. Thus, any damage to the parts due to a faulty lock-up relation is compeltely obviated, the effect being the same as if the connection between the pot and its actuating cam were entirely broken. In this connection, it may be noted that, as usual, the machine is equipped with means which operate automatically to prevent the operation of the pot plunger 15 in the event the advance of the metal pot 2| is arrested, so that there is no danger of a metal squirt taking place.

As the mold slide I4 is returned to its rearmost or inactive position by its actuating cam 26, after having thus been arrested in its forward movement, the spring 36 acts to restore the normal spaced relation between the long and short members 26, 21 of the mold slide lever, and the rocker arm 58 is likewise returned to its normal or inactive position. Thereafter, the pull spring 6i acts to rotate the rock shaft 54 clockwise to restore the high portions 64 of the collars 52, 53 into cooperative relation with the hardened plates 50, 5|, as shownin Fig.1.

'I'o permit the free rotation of the rock shaft 54 in positioning the high and low portions 64 and 10 of the collars 52, 53 in front of the hardened plates 50, 5|, the metal pot 2| is supported in its position of rest by a set screw 4'! carried by a bracket 46 secured to the base frame 45 of the machine, and a compression spring 49 (see Fig. 2) is interposed between the two members 40, 4| of the metal pot lever to urge them apart and maintain the roller 48 in contact with the cam 25. The spring 49 is positioned about a stud 49 slidably mounted in the short member 40 and pivotally secured at one end to the long member 4|. The other or free end of the stud 49 is provided with a pair of adjusting nuts 49 for effecting the desired adjustments of the spring.

Having thus described my invention what I claim is:

1. In a typographical slug casting machine out causing damage in the event of a faulty lockup relation of said parts.

2. In a typographical slug casting machine, the combination of a metal pot, an actuating cam therefor, an intermediate train of connections adapted as the cam rotates to advance the pot a given distance to establish a metal tight lock.- up between the pot mouthpiece, slotted mold and composed line, and means responsive to the creation of a faulty lock-up relation between said parts for adjusting said train of connections so that the advance of the metal pot thereby is decreased sufficiently to permit its actuating cam to proceed uninterruptedly without causing damage.

3. In a typographical slug casting machine, the combination of a. metal pot, an actuating cam therefor, an intermediate train of connections adapted to advance the pot a given distance to establish a metal tight lock-up between the pot mouthpiece, slotted mold and composed line,

. and a lost motion device included in said train of connections and operative automatically to permit the pot actuating cam to proceed uninterruptedly without causing damage in the event of a faulty lock-up relation between said parts.

4. In a typographical slug casting machine, the combination of a metal pot, an actuating cam therefor, an intermediate train of connections adapted as the cam rotates to advance the pot a given distance to establish a metal tight lock-up between the mouthpiece, slotted mold and composed line, and means for adjusting said train of connections to curtail the advance of the metal pot while permitting its actuating cam to partake of a complete rotation.

5. In a typographical slug casting machine, the combination of a metal pot, an actuating cam therefor, a lever comprising two members interposed between said pot and its actuating cam and adapted as the cam rotates to advance the pot a given distance to establish a metal tight lock-up :between the mouthpiece, slotted mold and composed line, a normally inoperative lost motion device included between said members, and means for rendering said lost motion device operative when required to curtail the advance of the metal pot while permitting its actuating cam to partake of a complete rotation.

6. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the moldtowards the composed line, a metal pot, a cam for advancing the pot a given distance to establish a metal tight lock-up between the mouthpiece, mold and composed line, and means for automatically decreasing the advance of the metal pot sufficiently to permit its actuating cam to proceed uninterruptedly without causing damage in the event the advance of the mold slide is interrupted 7. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a metal pot, a cam for advancing the pot a given distance'to establish a metal tight lock-up between the mouthpiece, mold and composed line, and means responsive to the arrest of the mold slide during its advance for automatically decreasing the advancing movement of the metal pot sufliciently to permit its actuating cam to proceed uninterruptedly without causing damage. i

8. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a train of connections interposed between said slide and its actuating cam and ineluding a member which yields in the event the normal advance of the slide is interrupted, a metal pot, a cam for advancing the pot a given distance to establish a metal tight lock-up between the mouthpiece, mold and composed line, and means controlled by said yielding member for automatically decreasing the advancing movement of the metal pot sufilciently to enableits actuating cam to proceed uninterruptedly without causing damage in the event the advance of the mold slide is interrupted.

9. In a, typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a pivotally mounted metal pot, a cam for til-ting said pot forwardly about its pivotal axis to establish a metal tight lock-up between the mouthpiece, mold and composed line, a train of connections interposed between said pot and its actuating cam, and automatic means for so maintaining the train of connections that when the advance of the mold slide is uninterrupted the metal pot is tilted forwardly about its pivotal axis to its normal foremost position but when the advance of the mold slide is interrupted the forward movement of the metal pot about its pivotal axis is reduced sufficiently to permit its actuating cam to proceed uninterruptedly without causing damage.

10. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a train of connections interposed between said cam and slide and including a member which yields in the event the advance of [the slide is interrupted, a pivotally mounted metal pot, a cam for tilting said pot forwardly about its pivotal axis to establish a metal tight lock-up between the mouthpiece, mold and composed line, a train of connections interposed between said pot and its actuating cam, and automatic means for so maintaining the train of connections that when the advance of the mold slide is uninterrupted the metal pot is tilted forwardly about its pivotal axis to its normal foremost position but when the advance of the mold slide is interrupted by the yielding of said member the forward movement of the metal pot about its pivotal axis is reduced sufiiciently to permit its actuating cam to proceed uninterruptedly without causing damage.

11. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a pivotally mounted metal pot, a cam for tilting said pot forwardly about its pivotal axis to establish a metal tight lock-up between the mouthpiece, mold and composed line, a lever comprising two relatively movable members interposed between said pot and its actuating cam, and automatic means for maintaining said members against relative movement when the advance of the mold slide is uninterrupted so that the metal pot is tilted forwardly about its pivotal axis to its normal foremost position but permitting relative movement between said members when the advance of the mold slide is interrupted so that the forward movement of the metal pot about, its pivotal axis is reduced sufficiently to permit its actuating cam to proceed uninterruptedly without causing damage.

12. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a pivotally mounted metal pot, an actuating cam therefor, a lever comprising two members interposed between said pot and its actuating cam and adapted as the cam rotates to tilt the pot forwardly about i'tspivotal axi to establish a metal tight, lock-up beween the mouthpiece, mold and composed line, and means for automatically creating lost motionybetween said members in the eventthe advance of the mold slide is interrupted so that the advance of the metal pot is thereby decreased sufliciently to permit its actuating cam to proceed uninter-,

ruptedly without causing damage.

13.1 In a typographical slug casting machine, the combination of a mold slide, ,a cam for'advancing said slide to carry the mold towards the composed line, a pivotally mounted metal pot, a cam for, tilting said pot forwardly about its piv otal axis to establishametal tight; lock-up between the mouthpiece, mold andcomposed line, a lever comprising two members interposed between the pot cam and the pot, means for'maine taming said members in such spaced-relation that when the advance of the mold slide is uninterrupted the metal pot is tilted forwardly about its. pivotal axis to its normal foremost position, and means for automatically so changing the spaced relation between said membersingthefevent the advance of the mold slide is interrupted that the advance of the metal pot about its pivotal axis is decreased sufficiently to permit its actuating cam to pro ceed uninterruptedly without causing damage.

14. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a lever comprising two members interposed between said cam and said slide which move relatively with respect to one another when the advance of the mold slide is interrupted, a pivotally mounted metal pot, a cam for tilting said pot forwardly about its pivotal axis to establish a metal tight lock-up between the mouthpiece, mold and composed line, a lever comprising two members interposed between said pot cam and said pot, means for maintaining said pot lever members in such spaced relation that when the advance of the mold slide is uninterrupted the metal pot is tilted forwardly about its pivotal axis to its normal foremost position, and means responsive to the relative movement between the two members of the mold slide lever for creating lost motion between the two members of the pot lever when the advance of the slide is interrupted to decrease the advance of the pot about its pivotal axis sufficiently to permit its actuating cam to proceed uninterruptedly without causing damage.

15. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold forwardly towards the composed line, a pivotally mounted metal pot, an actuating cam for tilting said pot forwardly about its pivotal axis, a lever comprising two members interposed between said pot cam and said pot, spacing means carried by said members and adapted when in one position to maintain said members in such spaced relation that the metal pot is tilted forwardly to establish a metal tight lock-up between the mouthpiece, mold and composed line and when in another position to maintain said members in such spaced relation that the advance of the metal pot is short of the position necessary to establish said lock-up, and means for automatically adjusting said spacing means so that the advance of the metal pot is short of the position necessary to establish said. lock-up when the advance of the mold slide is interrupted to permit the pot actu-tating camwto continue uninterruptedly without causingdamage. 16.;In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold forwardly towards the composed line, a pivotally mounted 'metal pot, a cam for tilting said pot forwardly about its pivotal axis to establish a metal tight lock-up between the mouthpiece, mold and composed line, a lever comprising two members in-. terposed between said pot and said pot cam, spac ing means carriedby said members having a high and a low portion, said high portion being adapted to maintain said members in such spaced relation that the metal pot moves forwardly about its pivotal axis to its foremost position to establish said lock-up, and said low portion being adapted to maintain said members in such spaced relation that the forward movement of the metal pot about its'pivotal axis is decreased, means for normally maintaining said high portion ofthe spacing means inoperative position, and means for automatically bringing said low portion of:

the spacing means into operative positionin the event the advance of the mold slideis interrupted to permit the pot actuating cam to continue uninterruptedly without causing damage.

17. In a typographical slug casting machine, the combination of a mold slide, a cam for advancing said slide to carry the mold towards the composed line, a lever comprising two members interposed between said cam and said slide and adapted to move relatively with respect to one another in the event the advance of the mold slide is interrupted, a pivotally mounted metal pot, a cam for tilting said pot forwardly about its pivotal axis to establish a metal tight lock-up between the mouthpiece, mold and composed line, a lever comprising two members interposed between the pot and its actuating cam, spacing means carried by said pot lever members having a high and a low portion, said high portion being adapted to maintain said pot lever members in such spaced relation that the metal pot moves forward about its pivotal axis to its foremost position to establish said lock-up, and said low portion being adapted to maintain said pot lever members in such spaced relation that the forward movement of the metal pot is decreased, means for normally maintaining said high portion of the spacing means in operative position, and means responsive to relative movement between the members of the mold slide lever for bringing said low portion of the spacing means into operative position so that the pot actuating cam may continue uninterruptedly without causing damage.

18. In a typographical slug casting machine, the combination of a mold slide, an actuating cam therefor, a lever comprising a pair of members interposed between said slide and its actuating cam and adapted to advance said slide during the rotation of said cam to carry the mold a predetermined distance towards the composed line and to move relatively with respect to one another in the event the advance of the slide is interrupted, a pivotally mounted metal pot, a metal pot actuating cam, a lever comprising a pair of members interposed between said pot and its actuating cam, a rock shaft carried by one of said pot lever members, a spacing collar carried by said shaft having a high and a low portion, said high portion being adapted to maintain said pot lever members in such spaced relanormally maintaining said high portion of the spacing collar in operative position, and means responsive to relative movement between said mold slide lever members for rotating rock shaft to bring said low portion of the spacing collar in operative position so that the pot actuating cam may continue uninterruptedly without causing damage.

19. In a typographical slug casting machine wherein the slug is cast in a slotted mold closed at the front by a composed line, and closed at the rear by the mouthpiece of a metal pot, the combination of pressure means for establishing a metal tight lock-up between said parts, and automatic means for relieving the locking up pressure when the parts occupy a faulty lock-up relation.

20. In a typographical slug casting machine wherein the slug is cast in a slotted mold closed at the front by a composed line, and closed at the rear by the mouthpiece of a metal pot, the combination of means for advancing the mold into approximate contact with the composed line, means for subsequently advancing the pot mouthpiece into contact with the mold, means including a powerful spring through which sufiicient pressure is exerted to establish a metal tight lock-up between said parts during the casting operation, and automatic means responsive to the arrest of the advancing movement of the mold due to a faulty lock-up relation of the parts for relieving them of the full lock-up pressure of the spring under such conditions.

21. In a typographical slug casting machine embodying a one-rotation driving clutch, the combination of a metal pot, actuating means therefor, and automatic means for adjusting the pot actuating means so that the advance of the pot is decreased suificiently to permit the driving clutch to complete its rotation without causing damage in the event of a faulty lock-up relation of the casting parts.

GEORGE P. KINGSBURY.

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