US857712A - Mold for type-machines. - Google Patents

Description

No. 857,712. I PATENTED JUNE 25, 1907. J. s. BANOROFT.

MOLD FOR TYPE MACHINES.

APPLIUATION' FILED DEOJ. 1904. RENEWED H019, 1905..

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No. 857,712. ATENTED JUNE 25, 1907.

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MOLD FOR TYPE MACHINES. I APPLICATION FILED DEC. 1, 1904. RENEWED NOV. 9, 1905.

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Umrnn STATES PATENT OFFICE.

JOHN SELLERS BAN CROFT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN OR TO LANSTON MONOTYPE MACHINE COMPANY, OF PHILADELPHIA, PEN N SYLVANIA, A CORPORATION OF VIRGINIA.

IVIOLD FOR TYRE-MACHINES.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed December 1, 1904. Renewed N vember 9, 1905. Serial No. 286,599.

IT!) all whom, it Wuty concern.-

Be it known that I, JOHN SELLERS BAN- CROFT, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Molds for Type-Machines and I do hereby declare the following to be a full, clear, and exact description of the'same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

This invention relates to improvements in molds for type casting machines of the class illustrated in Patent No. 625,998 and has for its principal objects to improve the quality of the product and increase the capacity of the machine and its speed ofproduction.

To this end the invention consists in so constructing, arranging and operating the cut-off or jet forming member that it will close the induction passage immediately after the metal has been injected into the mold and while under pressure, so that the nozzle of the injecting-mechanism may be at once withdrawn from contact with the mold, thereby materially diminishing the period of such contact and the consequent heating of the mold and cooling of the nozzle, and enabling the metal to be worked at a much lower temperature;-all as hereinafter fully described, the novel features being pointed out in the claims.

In the accompanying drawings illustrating a preferred form of embodiment of said inventionFigure 1 is a top plan view of a mold containing the improvement as applied to a type casting machine. I Fig. 2 is a top view of the mold detached with the crossblade and its supporting block in section. Fig. 3 is an end elevation partly in section, showing the cut-oil action closing the induction end of the mold cavity. Fig. 4 is an end view of the mold looking toward the devices for temporarily arresting the cross-blade. Fig. 5 is a front elevation of the supporting block carrying the cross-blade. Fig. 6 is a perspective view of the cross-blade detainer. Fig. 7 is a perspective of the latch. Fig. 8 is a similar view of the cross-blade.

Similar numerals designate like parts in the several figures.

Type casting machines of the class referred to are usually equipped with an adjustable mold a series of matrices, any one of which may be brought opposite the open end of the mold; means for tightly clamping the selected matrix upon the mold; and a metal injecting apparatus for supplying molten metal to the mold.

In the illustration the movable nozzle of the injecting mechanism is indicated at 1 F ig. 3 and the matrix at 2.

The mold includes a frame or base plate 3 provided with a nozzle seat 4 side blocks 5, 6; an adjustable mold-blade 7 g and a crossblock 8 attached to the type carrier 9 and provided with a jet opening 10, Fig. 5.

As heretofore constructed the several members of the cross-block were rigidly united, and as the matrix seated upon the crossblock, side blocks and mold-blade, the type carrier could not be advanced, to cut off the jet and close the mold, until after the metal had set and the matrix had been withdrawn from its seat. This required that the nozzle should remain in contact with the mold for a considerable period, or until the mold. was closed by the advance of the cross-block and type carrier. This prolonged contact was detrimental, in that it contributed to the heating of the mold and the cooling of the nozzle, both of which were undesirable, the first as tending to delay the setting ofthe metal inv the mold, and the second as tending to chill the metal in the tip of the nozzle and thus plug the passage. Now it is essential to rapid action that the mold should be maintained at a relatively low temperature in order that the metal may chill or harden immediately it is injected, hence the mold is usually provided with a water circulation (not shown) and the nozzle of the injecting mechanism is withdrawn in the intervals between casts instead of being maintained in contact with the mold. It is of equal importance that when the nozzle is applied to the mold the metal contained therein should be in fluid condition, as otherwise the su ply for the mold would be interrupted an no cast would be made. At high speeds the intervals between successive applications of the nozzle to the mold were so short that unless the metal supplied to the nozzle was maintained at a relatively high temperature considerably in excess of its melting point and in the cross-blade.

detrimental to the quality of the metal, the nozzle could not recover its temperature, and, as a result, the metal would chill in the tip, where it contacted with the mold, thus forming a plug in the passage.

The present inventionis designed to shorten the period of contact between the nozzle and mold and correspondinglylengthen the period of separation, during which the temperature of the nozzle may be restored, by so arranging the parts constituting the crossblock that the portion constituting the front wall of the mold cavity and upon which the matrix takes its bearing shall remain stationary or in position while another part L. e., that containing the jet opening, is advanced to close the passage leading to the mold, thus permitting an earlier withdrawal of the nozzle and at the same time confining the metal under initial pressure within the mold, and this, too, without material change in the operation of the machine as a whole. WVith these ends in view the rear wall of the crossblock 8 or that next the side- blocks 5, 6, is cut away or reduced to receive the cross blade 11, the latter resting upon the jet blocks 12 and forming the front wall of the mold cavity. This cross-blade is supported to reciprocate longitudinally of the crossblock and is held down to position and guided in its movement by two pins 13 received in transverse seats formed in the cross-block and engaging the lower faces of openings 14 The lower faces of the ends of pins 13 are cut away or flattened to form bearings and their opposite ends are furnished with heads or collars 15, and each is furnished with a gaging screw 16 and an adjusting screw 17 bearing upon its shank for regulating the contact or pressure upon its seat in the cross-blade.

To one end of the cross-blade is connected a detainer, so called, in the form of a block 18, Fig. 6, provided with a lateral projection 19, (preferably in duplicate) seating in notches 20 formed in the cross-blade and carrying apivoted latch21, thelatter also engaging notches 20. The detainer or block 18 is also provided with a lateral projection or shoulder 22 in position to engage the side block 6, or a gage plate 22 secured thereto, or some other fixed abutment, while a spring 23, Fig. 2, interposed between the latch 21 and a support on the cross-block (such as a nut 24 applied to a pin 25 secured to the end of the cross-block and extending through openings in the latch and detainer) operates in a direction to constantly press the detainer and its latch toward the end of the cross block and to correspondingly position the cross-blade.

The several parts are so constructed, pro portioned and arranged that when the typecarrier is advanced in position to receive the type from the mold, as represented in Fig. 2,

the detainer 18 will be held by its spring in contact with the cross-block, with the shoulder 21 separated from the fixed abutment. When, now, the type carrier is retracted, to deliver the type, and just before it arrives at the end of its stroke, as indicated by the dotted lines in Fig. 1, the shoulder 21 by engaging the fixed abutment will arrest the detainer and with it the cross-blade, thus re taining the latter in position while the type carrier and cross-block continue in motion until they arrive at the delivery position indicated by full lines, Fig. 1. When in this position the jet opening is in communication with the mold cavity and nozzle seat and the mold is in condition to receive the. matrix and nozzle. At the proper time the nozzle is seated and the metal injected, followed by the advance of the type carrier and cross-block. The immediate effect is to shift the jet opening and thus close the mold (see Fig. 3) so that the nozzle can be at once withdrawn from contact without danger of leakage or the withdrawal of metal from the mold such as might occur if the latter remained open. During this preliminary advance of the cross-block, the cross-blade rem ains stationary, the spring holding the detainer against the abutment until it is picked up by the cross-block, whereupon both move together. In the meantime the pressure upon the matrix has been released so that the cross-blade can move without injury to the matrix.

By the employment of removable or interchangeable gage plates 22 the point at which the cross-plate shall be arrested and held can be regulated, to adapt the crossblock for molds of different dimensions, and the object in interposing the latch between the detainer and its spring instead of applying the latter directly to the detainer is to prevent lost play and insure accurate positioning of the cross-blade, the spring acting through the latch on one side of the bearing in the cross-blade while the detainer engages the opposite side of the bearing.

In applying the improvement to existing machines no change in the mechanism is required other than a slight modification in the pump and type carrier cams to effect the unseating and withdrawal of the nozzle at an earlier period, and to slightly change the reverse movement of the type carrier.

Experience has demonstrated that with the improved mold action the temperature of the metal can safely be reduced approximately 100 as compared with what was be fore found desirable to avoid the plugging of the nozzle while in operation, thereby not only avoiding delays due to this cause but enabling the speed to be increased, especially in connection with the manufacture of the larger sizes of type and by closing the mold immediately the metal is injected so as to confine the latter while setting stronger and more solid type bodies are produced.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A mold such as described provided with independently movable cross-blade and jet slide, in combination with means for successively operating the jet slide and crossblade, to first cut ofi the sprue and close the mold in advance of the movement of the cross-blade.

2. A mold. for type casting machines such as described provided with a cross-blade and an independently movable jet slide intermediate the mold cavity and nozzle seat.

3. In a mold for type casting machines such as described provided with side blocks, mold-blade and nozzle seat, and in combination therewith a movable cross-block provided with a jet opening and an independently movable crossblade. I

4. In a mold for type casting machines such as described and in combination with the reciprocating cross-block thereof, a crossblade forming one wall of the mold cavity and a detainer coupling the cross-block and cross-blade and engaging a fixed abutment to limit the motion of the cross-blade.

5. In a mold for type machines and in combination with the cross-block thereof, a cross-blade guided. to reciprocate upon the cross-block.

6. In a mold for type casting machines and in combination with'the reciprocating crossblock thereof, a cross-blade, mounted to reciprocate upon the cross-block, a pin extending transversely of the cross-blacle and crossblock engaging bearings on each, and an adjusting device engaging said pin.

7. In a mold for type casting machines and I in combination with the cross-block thereof,

a cross-blade mounted upon the cross-block, a pin extending transversely of the crossblock and engaging a bearing on the crossblade, a gage for said pin and an adjusting screw for holding the pin upon said gage.

8. In a mold. for type casting machines the combination with a reciprocating cross-block provided with. jet blocks and an independently movable cross-blade, of a cross-blade detainer carried by the cross-block and engaging the cross-blade, means for yieldingly advancing said detainer in one direction, and a shoulder for engaging a fixed abutment, to

arrest the detainer and crossblade during a,

cross-block, a detainer carried by the cross block and engaging the cross-blade, said detainer being provided with a retracting spring and a shoulder, the latter in position to engage the mold when the cross-block is at one extreme of its movement.

10. In a type casting machine such as described and in combination with the movable matrix nozzle and type carrier thereof, a mold provided with a nozzle seat; a reciprocating cross-block coupled with the type carrier and containing the jet opening; a crossblade movable upon the cross-block; a detainer coupled with the cross-block and crossblade and provided with a retracting spring; and means for engaging the detainer, to arrest the latter during the motion of the crossblock in one direction.

11. In a mold for type casting machines and in combination with the'reciprocating cross block and independently movable cross-blade coupled to a detainer, a removable gage for intercepting the detainer to limit the motion of the cross-blade.

12. In a mold for type casting machines such as described and in combination with the reciprocating cross-block and cross-blade thereof, a cross-blade detainer mounted upon the cross-block and engaging the cross-blade, said detainer provided with an arm engaging a bearing on the cross-blade, a latch engaging an opposing bearing 011 the cross-blade, and a spring acting upon said latch to advance the detainer and hold it under yielding pressure in contact with the cross-block.

13. A mold for type casting machines such as described provided with means for closing the inductive end of the mold cavity while the matrix is seated and before the injected metal has entirely solidified.

JOHN SELLERS BANCROF T.

I/Vitnesses MORTIMER. A. JoNEs, W. A. START.

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