US1927764A - Pump control for line casting machines - Google Patents

Description

Sept. 19, 1933. LE ROY w. WILLIS 1,927,764

PUMP CONTROL FOR LINE CASTING MACHINES Filed Dec. 18, 1931 Illlllllllll Illllllllill HI]! ATTORNEY Patented Sept. 19, 1933 v i UNITED, STATES V 1,927,764 v PUMP CONTROL FOR LINE CASTING.

- MACHINES Le Roy W. Willis, Stamford, Conn; assignor' to Intertype Corporation, Brooklyn, N. Y., a corporation of New York I Application December 18, 1931 Serial No. 581,972

11 Claims (01. 22-70) The present invention relates to improvements in line casting machines ,of the class wherein a composed line of matrices is presented to the front of a slug casting mold, the mouthpiece of a metal pot is brought against the back otthe mold and a pump contained in said pot and controlled by a cam-operates to inject molten metal into the mold and against the line of matrices to produce a type bar or slug.

The invention relates more particularly to the pump control means for such machines whereby the pump may be caused to act normally or slowly for the injection of the metal into molds of the usual form and size and for casting from the usual matrices or may be caused to act to inject the metal quickly or suddenly-into molds of large sizes such as those used for the casting of heading or display type to insure rapid and complete filling of such molds or in casting from matrices the characters of which have fine or slim lines in order to insure complete filling out of the outlines of such characters and thus obtain sharpness of detail in the reproductions of such characters on the type bars or slugs.

The present invention is an improvement upon the pump control means shown and described in U. S. Letters Patent No. 1,290,201, grantedJan. 7, 1919 to T. S. I-Iomans, the device shown in said patent for imparting the quick or sudden action to the pump being so arranged that it comes into action during each cycle of operation of the machine. In the commercial application of that device, a hook has been provided for holding it out of action if desired, such having been found necessary since it was not always desirable to allow the pump to descend with great force and suddenness.

The present invention provides an improvement upon the device as disclosed in said Homans patent as well as the commercial application thereof, since the device in both of said instances has required manual manipulation thereoffrom its relatively inaccessible position at the rear of the machine for throwing it into and out of action. According to the present invention, the pump control device has means for constantly holding it out of action so that a normal stroke of the pump can take place, and means inde-. pendentthereof and controlled by the operator, at will whereby the pump control device will auto-, matically respond in accordance with a setting made by the operator at the front. of the machine so that it will cause a normal stroke of the pump plunger or a quick and forceful action thereof, as desired.

To these andother ends, the invention consists in certain improvements and-combinatlons and. arrangements of parts all as willibe hereinafter described, the features of novelty beingpointed out particularly in the claims specification.

In the accompanying drawing: r 1 Fig. 1 is a side elevation of the castingmech-g anism of a linecasting machine of well' known form but embodying a-pump controlling .device at the. end. of the constructed in accordance with thejpresent invention; V

Fig. 2 is a detail side elevation of a portionof the pump controlling cam and pump actuating means, showing the pump controldevice and its setting means in position fornormal operation of thepump; i Fig. 3 is a view similar to Fig. 2 but showing the pump. control device and its setting means in position for a-quick or sudden stroke of the pump; Fig. i is an enlarged section taken-on thelline 4--4ofFig.3,and

Fig. 5 is a detail view on an enlargedscale of the pump'control device. 7 Similar parts are designated by the same reference characters in the different figures. I, The present invention is applicable generally to line casting machines of the class employing a pump for injecting metal into a mold for the casting of a type bar or slug and having a cam or equivalent member operating in proper timed 1 relation to the operation of the machine for causing or permitting operation of the pump at appropriate times. In the present instance, the invention is shown applied to the casting mechanism of a machine of the well known class shown and described. generallyin U. S. Letters Patent No. 436,532, granted Sept. 16,1890 to O. Mergenthaler, and the preferred embodiment of the invention is shown and will be hereinafter-described. It is to be understood, however, that the invention is not restricted .to the precise con struction; shown since equivalent constructions are contemplated and such will beincludedwith in the scope of the claims. v

In the present instance, 1 represents a portion of the frame of a typographical machine of the class referred to, Zrepresents the usual mold wheel carrying a slug casting mold Which is brought at appropriate times into casting position, 3 represents a portion of the usual ,so-called first elevator which serves'to present a composed line of matrices in front of the-mold for the casting of the typebar or slug. against the character bearing edges of the matrices, irepresents the into the mold to cast the type bar or slug therein.

The pump plunger operatingrocl 6 is operatively connected to an arm 7 of a pump operating lever 8, this lever being pivoted as usual on a pivot pin or shaft 9 mounted in a bracket 10 attached to the stationary frame of the machine, and a spring 11 is attached at one end to the bracketlO and at its other end to a rod 12, the lower end of this rod bearing on the arm 7 and acting in a direction to force the arm 7 downwardly and thus operate the pump plunger on its metal injecting stroke. 1

The pump operating lever '8, as shown, is controlled by a slowly rotating cam 13 mounted on the main cam shaft 14 of the machine, as usual, this cam having a depression 14 in its circum ference, and the pump operating lever 8 has an arm 15 carrying a roller 16 which latter rides on the periphery of the cam 13, thepump plunger being then held in its raised or inactive position and the roller 16 drops into the depression 14 when the latter is brought opposite to the roller 16 by the rotation of the cam, thereby allowing descent of the arm 7 under the action of the spring 11 and thus causing ametal injecting strokeof the pump to effect the casting of the type bar or slug in the mold, it being understood that'the pump makes a metal injecting stroke at the appropriate time during each cycle of operation of the casting mechanism.

According to the present invention, a pawl 1'7 is'pivoted on a pivotpin or screw 18 in a recess 19 formed in one side of the cam 13, this recess having a banking surface 20' against which the pawl may rest while in one position and having an opposite banking surface 21 which limits the swing of the pawl in the opposite direction. A spring 22 is connected at one end, as by the pin 23, to the pawl 17 and the other end of this spring isattached, as by the pin 24, to the body of the cam, this spring being under tension so that it normally acts toswing the'pawl 17 against the banking surface 20 and to hold it thereagainst. The pawl 17 is also provided, at the side thereof removed from the banking surface 20, with a lug 25 which extends substantially to the opposite or inner face of the cam,th'is lug forming a widened edge or lip on the corner of the pawl adjacent to the depression 14 and over which the roller 16 rides to release the pump for operation.

The portion of the outer or top surface 26 of that part of the pawl lying within the recess 19 which is formed by the top of the lug 25 is curved on a radius which is concentric with the center of the cam 13 when the pawl 17 rests against the banking surface 20, as shown .in Fig. 2, and the portion of this surface from the point where the roller 16 first contacts with it to a point thereon represented by the intersection of a line drawn through the axis of the cam and the axis 18 of thepawl is concentric with the cam. when the pawl is extended against the banking surface 2l, but from the latter point to the dropoff corner of the lug 25, said surface recedes within the periphery of the cam when thepawl is extended. The relatively raised end portion 27 of the'outer or upper surface 27 of that pora pair of notches 35 one or the other of which is engageable with the locking plate 34. Reciprof in Figs. 3 and 5 so that said end portion 27 'will project beyond the periphery of the cam when the pawl rests against the banking surface20, as shown in Fig. 2. The roller 16 on the pump actuating lever is sufficiently wide to overlap and ride upon theisurface 26 of the pawl 17, the portion of said surface formed bythe top of the lug 25' formnig a concentric continuation of the outer surface of the cam when the pawl is swung against the abutment surface 20 as shown in Fig. 2, and the riding ofthe roller 16' over the outer edge of the lug 25 while the pawl occupies this position will cause the pump to make its normal or relatively slow metal injecting stroke as the roller 16 settles slowly or gradually into the depression 14 in the cam under the action of the spring 11. When the pawl 17 is swung outwardly, away from the banking surface 20 and against the banking surface 21, the roller 16, as it rides over the outer edge of the lug 25, will be suddenly released by the swing of the pawl 1'7 from its extended position back against the banking surface 20, under the force applied by the spring 11 to move the roller 16 inwardly toward the center of the cam, thereby effecting a sudden or 1 abrupt metal injecting stroke of the pump.

The means provided by the present invention for controlling the position of the pawl 17, and hence the operation of the metal injecting pump, comprises, as shown, an arm 28 fixed to one end 1 of the shaft or pivot 9 which latter is rotatable in the bracket 10, this arm 28 carrying a roller 29 which is offset to one side of the main or pump controlling roller 16 and in the plane in which the surface 2'7 of the pawl operates, and 1 an arm 30 which is fixed to the other end of the shaft 9 and is operatively connected to 'a rod 31 which extends forwardly to the front of the machine where it is provided with an operating knob or handle 32. The rod 31 is reciprocable for- 1 Wardly or rearwardly through the face plate 33 of the machine, and a locking plate 34 is fixed to the face plate and the rod 31 is provided with cation of the rod 31 forwardly or rearwardly swings the roller 29 toward or from the cam 13, one of the notches 35 being so located that when it is engaged with the locking plate 34, the

roller 29, at the side thereof toward the center of the cam, itwill be engaged by the surface 27 on the pawl 17 as the latter rotates with the cam, and since the pawl 17 will normally lie against the banking surface 20 under the action of the spring 22, at which time the portion 2'7 of the surface 2'7 toward the depression 14 will project beyond the circle of the outer periphery of the cam, the pawl 1'7 will be held by the roller 29 so that it will pivot about its pivot point 18 as the rotation of the cam proceeds in the direction indicated by the arrow in Fig. 1, so that the'pawl Will be eventually rocked into position against 29, the pump controlling roller 16 will'have en-.

gaged the surface 26 on the pawl, and as the rotation of the cam continues, the roller 16 will ride on the surface 26, under the pressure of the actuating spring 11, until the roller 16'reaches the corner of the pawl formed 'by the lug 25 adjacent to the depression 14, the force of the actuating spring 11 then causing the pawl 17 to deflect back to its normal position againstthe banking surface 20 and such removal ofthe pawl from beneath the roller 16 allowing the latter to swing quickly or suddenly into the cam depression 14, thus causing a quick or sudden metal injecting stroke of the pump.

In operation, while making casts in molds of the usual size and from the usual matrix lines, the rod 31 will be set in its rear position as shown in Fig. 2, thepawl 17 then occupying its normal position against the banking surface 20 and being held in such position by thespring 22, the pump.

lever roller 16 then riding on the surface of the cam'13 until the pawl reaches it, the roller 16 then riding over the surface '26 on the pawl which forms a concentric continuation of. the periphery of the cam, until the roller 16 reaches the depression 14 in the cam, at which point the roller 16 leaves the surface 26 on the pawl and enters the depression in the cam, thus allowing the pump actuating lever 8 to rock about the shaft 9 as a bearing or center and thus impart a normal metal injecting stroke to the pump plunger through the pump plunger operating rod 6. When it is desired to provide a sudden and forceful metal injecting stroke of the pump plunger, as in ejecting molten metal into molds for casting large slugs or slugs in which the characters on the matrices aligned against the front of the mold have fine or slim lines against which the molten metal must be caused to flow with great pressure in order to completely -fil1 out the outlines of the characters, it is only necessary for the operator, at the front of the machine,-to"pull the rod 31 forwardly and to engage the rear notch 35 with the locking plate 34. Such move ment of the rod 31 will rock the shaft 9 and arm 28 into a position where the roller 29 lies on the same pitch circle with the periphery of the main cam, as shown in Fig. 1, the locking of the rod 31 by the plate 34 firmly holding the roller 29 in such position. Since the roller 29 is in the plane of movement of the surface 27 on the pawl 17, the relatively raised portion 2'? of this surface on the pawl will come against the roller 29 as the pawl is brought opposite to the roller 29, as shown in Fig. 1, and as the cam continues to rotate in the direction indicated by the arrow in said figure, the pawl 17 will be thereby held back in its movement as the rotation of the cam continues, since the end portion 2'7 of the surface 27 on the pawl then projects beyond the circle in which the periphery of the cam lies until the portion 2'7 is brought into concentric relation with the periphery of the cam and into position to pass beneath the roller 29, as shown in Fig. 5. The further rotation of the cam therefore causes the pawl 17 to rock on its pivot 18, from its normal position against the banking surface 20 into extended position against the banking surface 21 as shown in Figs. 3 and 5. Before the pawl 17 passes beyond the roller 29, its surface 26 is engaged by the main or pump controlling roller 16, and the roller 16 will ride over the surface 26 on the pawl until it reaches the outer corner of the pawl adjacent to the depression 14, the pressure of the roller 16 against the pawl under the action of the spring 11 holding the pawl in its extended position until the roller 16 reaches the corner thereof, whereupon the inward pressure of the roller -16 under the action of the spring 11 will cause the pawl 17 to be deflected back into its normal position against the banking surface 20, thus removing thepawl from beneath the roller16; and while the roller 16' will be released at a somewhat later point than when the pawl occupies its-nor mal position against the banking surface 20, the release of the roller '16 by the pawl 17 while the latter is in its extended position, will be more sudden so that the roller 16 will enter the depression 14 in the main cam without retardation, due to the instant deflection of the pawl from beneaththe roller 16. In order to restore the 7 machine for the making of casts in the normal or usual way, it is only necessary for the operator to unlock the rod 31 from the-locking plate 34 and to set said rod in its rear position where the roller 29 will clear the pawl I'I'during rotation of thecam.

From the foregoing, it will be seen that the present invention provides means which may be conveniently operated from the front of the machine for controlling theoperation of the metal injecting pump so as to produce either the normal metal injecting strokes thereof or sudden or abrupt strokes, as desired, thus rendering it unnecessary for the operator to'leave his usual position at the front of the machine and to set the pump control means by reaching into the relatively inaccessible cam shaft, and it will also be seen that the improved pump control" means effects the setting of the pawl on the cam automatically during the rotation of the cam. The

pump control means provided by. the present invention also enables the single pawl to control the operation of the pump to effect a normal or a sudden or quick metal injecting stroke, according to whethertsuch'pawl is in its normal or its extended position, the construction being thus simplified and reliable operation attained.

I claim as my invention:-

1. Ina line casting machine having a pump for injecting molten metal into a mold, a pump actuating member connected to the pump, and 21.

rotatable cam carrying a part engageable with said'pump actuating member and movable into different positions on the cam for controlling the rotatable cam carrying a part engageable'with said pump actuating member and movable into different positions on the cam for controlling the operation of said pump, means'capable of being set to directly engage and move said part into one of its pump controlling positions during the rotation of said cam.

3. In a line casting machine having a pump for injecting molten metal into a mold, a pump actuating member connected to the pump, and a said actuating member and movable into different positions on said rotatable cam to control the operation of said actuating member, said part having an outer edge thereon facing toward the '145 rotatable cam carrying a-part engageable with I a point remote from said rotatable cam and engageable directly with said. outer edge of said part to set, said part in one of said pump controlling positions. a

4. In a line casting machine having a pump for injecting molten metal intora mold, a pump actuating member connected to the pump, a cam carrying a part movable into difierent positions thereon, said part being engageable with the pump actuating member to control the operation of said member, and means capable of being set from the operators position at the front of the machine to act directly on said part during rotation of the cam to move said part intoone of its pump controlling positions.

5. In a line casting machine having a pump for injecting molten metal into a mold, a pump actuating member connected to the pump and carrying a roller, a cam carrying a part movable into differentpositions thereon said part being engageable with said roller of the pump actuating member to control the operation of said member, and means capable of being set from the operators position at the front of the machine to act directly on said part during rotation of the cam to move said part into one of its pump controlling positions;

6. In a line casting machine having a pump for injecting molten metal into a mold, an actuating member connected to the pump, and a cam carrying a part movable into different positions thereon, said part being engageable with said actuating member to control the operation of said member, meanscapable of being set from a point remote from the cam into and out of position to directly engage said part to move said part into one of said pump controlling positions.

'7. In a line castingmachine having a pump for injecting molten metal into a mold and an actuating member connected to the pump, a circular rotatable cam carrying a pawl movable into difierent positions thereon, said pawl being engageable with said actuating member to control the operation of said member, said pawl also having a surface which is a continuation of the curvature of that of the cam when the pawl is in one position and projecting beyond the surface of the cam when in another position, and means capable of being set to engage and act on said surface of said pawl tomove the pawl into on of 'its pump controlling positions.

8; In a line casting machine having a pump for injecting molten metal into a mold and an actuating member connected to the pump, a circular rotatable cam carrying apawl movable into difierent positions thereon, said pawl having a surface which is a continuation of that of the cam when the pawl is in one position and engageable with said, actuating member and having another surface which projects beyond that of the cam when in said position and isa continuation of the curvature of that of the ,cam when the pawl is in another position, and means to engage and act on said latter surface of ,the pawl to move the pawl, into one vof its pump controlling positions. 7 .7 9. Ina line casting machine having a pump for injecting molten 'metal-into.a mold and an actuating member connected to the pump, a circular rotatable cam carrying a pawl movable into different positions thereon, said pawl being engageable with said actuating member to control the operation of said member, said pawl also having a surface which is a continuation of the curvature of that of the cam when the pawl is in one position and projecting beyond'thesurface of the cam when in another position, a a

roller independent of said actuating member and 00 movable from an inactive to an active position to ride on said surface of the pawl to move the pawl into one of its pump controlling positions, and means for setting and holding said roller in said active position.

10. In a line casting machine, pump control means comprising, in combination, a pump cam having a yieldable part, thereon engageable by the cam roller, means normally retaining said part yieldingly in a retracted position on the cam, and means directly engageable with, said part and operable to overcome temporarily the holding power of said retaining meansto move said part to an extended position on said camp 11. Ina line casting machine, pump control 15 means comprisingyin combination, a rotatable pot ,pump cam provided with a depression into which the cam roller drops during the rotation of the cam, a yieldable pawl pivoted on-the cam in advance of said depression and adapted to be extended from" the cam roller engaging surface of the cam toward said depression, a spring fixed to said cam and to said pawl and normally holding said pawl in aretracted position, and means controllable from the operators position at the front of the machine to move said pawl to an extended position. i

LE ROY W. WILLIS.

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