US529851A - Embaying machine - Google Patents

Description

(No Model.) 4 Sheets- -Sheet 1.

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ENGRAVING MAGHINE. No. 529,851, Patented Nov. 27, 189.4.

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O. G. BRUOKNER.

ENGRAVING MACHINE.

Patented Nov'. 27, 1894.

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ENGRAVING 'MAGHINB.

No, 529,851. Patented Nov. 27, 1894-,

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(No Model.)

C. C. BRU'UKNER. ENGRAVING MACHINE.

N0. 529,851. Patented Nov. 27, 1894'.

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NITED STATES.

PATENT OFFICE.

CHARLES C. BRUCKNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE NATIONAL ENGRAVING MACHINE COMPANY, OF SAME PLACE.

ENGRAVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 529,851, dated November 2'7, 1894. Application filed October 23, 1893- $erial No. 488,860. (No model.)

To 0. whom it may concern:

Be it known that I, CHARLES C. BRUOKNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinow, have invented certain new and useful Improvements in Engraving-Machines, of which the following is a specification. My invention relates to the class of engraving machines shown and described in my application, Serial No. 465,731, filed March 13, 1893, and has for its objectimprovements in the machine therein set forth.

My improvements are illustrated in the accompanying drawings, in which Figure 1 is a plan, partly in section, and

with the tool-head broken away. Fig. 2 is a' front elevation with part of the tool lever and the contact points removed. Fig. 3 is a side elevation with the tool-head in section, and with the upper part of the tool-head slide broken away. Fig. 4 is a section on line X X of Fig. 1. Fig. 5 is a section of the tracing slide on lineY Yof Fig. 3. Fig. 6 is an enlarged section of the same on line Z Z. Fig. 7 is a partial section on line W W of Fig. 2 showing the work-holding chuck in position. Fig. 8 is a section of one of the pivoting blocks on line V V of Fig. 2. Fig. 9 is a detail of the copy-holding clamp together with the stop for the movement of the copy table and the method of making and breaking the circuit. Fig. 10 is a detail of one of the clamp jaws. Fig. 11 is a detail corresponding to Fig. 4. Fig. 12 is a detail corresponding to Fig. 3; and Fig. 13 is a diagrammatic View of the electric circuits and their connecting parts.

In the said drawings 1 is a bed on which is mounted a copy slide 2 and a work table 3. At one end of the slide 2 is a boss 4 on which is pivoted a hand lever 5 that works in the pivoting blocks 6 and 7 that are located on the bed 1 and the work table 3, respectively. The construction of these parts is the same in all respects as that described in my application previously referred to except as regards the method of clamping the block 7 to the table 3 which is similar to that shown on Fig. 8 and which will be described in another place. This construction is such that by vibrating the lever 5, the slides 2 and 3 are given parallel and synchronous movements in the same direction of a ratio to each other depending upon the location of the block 7 with respect to the length of the slot 8 in the table 3.

Secured to the lower edge ofthe table 3 and slightly removed from the front of the bed 1 is a rack 9 that engages with a small'gear 10 mounted on a pin 11 in the bed 1. Also mounted on the pin 11, and secured to the gear 10, is another and larger gear 12, that works in the space between the rack 9and the bed 1. In the front of the bed 1 and just below the rack 9 is a hole '13 in which may be placed a chuck 14 provided with a gear 15. The stem 16 of the chuck 14 is provided with two grooves 17 in either of which a pin 18 may engage. The pin 18 has a stem 19 (see Fig. 7) with head 20 and spring 21. The stem 19 runs through a chambered screw 22 that is adjustable in the bed 1 and serves as a backing for the pin l8.to keep it engaged with the grooves 17 in the stem 16 of the chuck 14.

The location of the grooves 17 is such that when the pin 18 engages the end groove the chuck will be held as shown in Fig. 7 and the gear 15 will engage the rack 9. When the pin 18 engages the other groove the chuck will be pushed in as shown in Fig. 3, and the gear 15 will engage the gear 12. The object of this arrangement is to enable the operator to engrave either the outside or inside of rings by making the top part of the chuck move either in the same or the opposite direction to the movement of the slide 2. a

At the left end of the slide 2, and forming a part thereof, is a frame 23 in which the clamps 24 are moved by a right and left hand screw 25. The clamps 24 are held in the frame 23 by means of the nuts 26 and Washers 27 which go on the screws 28 that form parts of the clamps 24. The part of the screw 28 that projects beyond the nut 26 is cut away as shown at 29 and the part left serves as a stop to regulate the length. of movement of the copy slide,and hence of the work table.

Opposite the center, the machine extends to the rear and carries a slide 30 that has a line of movement at right angles to that of the slides 2 and 3. On top of the slide 30 is another slide 31 that has a standard 32 with.

guides 33 on which the tool-head 34 is vertically adjustable by means of the screw 35 and hand wheel 36. The tool-head is in the form of a hood and supports the magnet 37 and bell-crank lever 38. One end of the lever 38 carries an armature 39 and the other end the engraving tool 40. Within the hood of the tool head 34 is an insulated pin 41 that projects past the screw 35 and engages by sliding contact with an insulated vertical rod 42 that is supported within the standard 32 and projects through below into contact with a metal strip 43 secured to and insulated from the slide 30. The strip 43 extends toward the rear and froin it a circuit is carried off in the manner hereinafter to be described. The circuit is also completed between the magnet 37 and the pin 41 by the wire 44.

Between the front and rear parts of the bed 1 is a recess 45 in which is located the bearing and operating mechanism for a screw 46 that moves the slide 30 on the bed 1. The bearing 47 for the screw 46 has at one end a quadrant 48 having a series of holes 49. On the front end of the screw 46 outside of the bearing 47 is secured a ratchet wheel50 that is turned by a pawl 51 on a block 52 on the slide 3. Located loosely on the screw 46 between the bearing 47 and the ratchet wheel 50 is a throw out dog 53 having a resilient arm 54 in which is a small pin 55 adapted to engage with any one of the holes 49 in the quadrant 48. The construction and the action of the parts 50, 51 and 53'are the same as those set forth in my application previously mentioned.

Located in the bed 1 to the rear of the center of the copy clamp, is a standard 56, on which is a tracing slide 57, that has a movement in the same direction as, parallel to and synchronous with the slide 30. This movement is conveyed from slide 30 to slide 57 by means of a lever 58 which is pivoted to the latter slide at point 59 and which works in the adjustable pivoting block 60, and the stationary pivoting block 61,the latter being located in a recess 62 in the bed 1. Secured to the side of the slide 30 is a bracket 63 having a slot 64 along which the block is adjusted. The stationary pivoting blocks 6 and 61 simply have stems that work in holes in the bed. The adjustable pivoting blocks have internal stems 65 terminating above in heads 66 that engage the recesses 67 beneath the slots 8 and 64. An eye-bolt 68 is secured into the head 66 and, passing through the slot 64, is connected to a weighted eccentric 69, by means of which the bracket 63 is securely clamped between the head 66 and the washer 70. This arrangement makes an automatic clamp that prevents the slipping of the block 7, or block 60, on the levers 5 or 58 and thus spoiling the work as sometimes happens when the operator forgets to tighten the ordinary screws.

Pivoted to the slide 57 is a lever 71 having a tracing point 72 at its front end. The other end of the lever 71 extends to the rear and terminates between two insulated contacts 73 and 74 that are supported in a bracket 75 on the slide 57. The contacts 73 and 74 consist of small stems having large heads one of which is lower than the other as shown in Fig. 5. An insulated switch 76 is pivoted at 77 on the bracket 75 and made so that it can be brought into engagement with either contact 73 or contact 74.

Located in the standard 56 and in the path of the screws 28 of the clamps 24 is a pin 78 having enlarged heads and insulated from standard 56 by the bushing 79, when the pin 78 is in the position shown in Fig. 9, but permitting electrical contact when moved to its other extreme position. The outside of one head is also insulated at 80 from electrical contact with the screw 28 on that side.

Fastened to the front of the tool head 34 is a magnet 90, having a hammer 91, that is just above and adapted to strike the tool holding arm of the lever 38. This magnet and hammer are the same as those ordinarily on sale for ringing door bells, and need no particular description. The circuit for this magnet is so arranged as to be closed when the main circuit is open, and open when the main circuit is closed. The object of this construction is to give a mottled appearance to the engraving by causing the tool to cut deeper when struck by the hammer 91, than when simply cutting normally. As the strokes of the hammer are rapid the actual cutting consists of very fine waves. It will be obvious that the hammer 91 may strike either upon the lever 38 or upon the top of the tool 40, the result, as far as the engraving is concerned, being the same in either case.

The electrical circuits are arranged as follows: A wire D runs from the battery or source of electrical energy to the magnet 37, thence through wire 44 to the pin 41, the rod 42 and insulated strip 43. From the rear end of this strip a wire A connects to the switch 76, and a branch B connects to the insulated pin 78. The return wire 0 connects the bed 1 and the source of electrical energy. A branch E from the wire D passes through the magnet 99 and connects to the post 95, and another branch F from the wire 0 connects to the post 96. A magnet 92 is located on wire 0, and has its armature 93 on the lever 94 that is pivoted to post 96 and bears against post when the current is not flowing through the wire 0. It will thus be seen that the circuit may be completed either by the tracing lever coming into contact with the pin 73 or 74 with which the switch 76 is in contact, or by the pin 78 being pushed into contact with the standard 56 by the screw 28 when the slide 2 has reached its extreme position to the left. It will also be seen that the circuit will remain closed while the slide IOC IIO

is moving to the right and until the other net 37 will attract the armature 39, thuslift- J ing the tool 40 away from cutting position.

WVhen the current is flowing through any of these courses, the magnet 92 attracts the armature93.thus breaking the connection between the lever 9s and the post 95, butthat when the current ceases through these courses and hence ceases through magnet 92, the arm 94 is drawn back against the post 95 thus completing the circuit from wire D through magnet 90, wire E, post 95, lever 94, post 96, wire F and that part of the return wire 0 that lies beyond magnet 92, and causes the hammer 91 to strike upon the tool holding arm 38.

The operation is as follows: The copy, consisting usually of type, and having their faces cut the reverse of ordinary type and as they are intended to appear in the engraving, is clamped on the copy slide between the jaws 24:. The length of the copy regulates the distance between the jaws 24 and consequently the screws 28, hence also the distance the copy slide 2 can be moved before being stopped by contact with the pin 78. It will thus be seen that the length of the stroke is automatically determined by the length of the copy and is not dependent upon the set of the operator. The work to be engraved upon is clamped to the top of the table 3 or held in the chuck 14 as the case may be. The tool 40 is then lowered until nearly in contact with the workand the block 7 is adjusted on'the lever 5 until the table 3 has a length of movement equal to the required length of engrav ing. In like manner the height of the engraving is determined by adjusting the block on thelever58. Usuallythislastadjustmentwill be accurate enough when the block 60 is approximately in the same relative position on the lever 58 that the block 7 is on the lever 5 and may be located by guess. Should it be required to make the height of the engraving an accurate dimension, or very large or small in respect to the length, the block 60 can be set by moving the slide 30, and hence the tool 40 over the work and the tracing point 72 over the copy, by means of the hand Wheel at the rear of the machine, and adjusting the block 60 so that the tool will have the required movement. The tracing point 72 is then set at the top of the copy and the engraving tool at the corresponding place on the piece to be engraved. The circuit is then closed through pin 78 by moving the copy slide to the left and the engraving tool is lowered to cutting position when the engraving is made by simply vibrating the hand lever 5 back and forth as far as the screws 28 and pin 78 will permit. It will be seen that the cutting of the tool takes place only during the movement'of the copy in the direction ofthe arrow in Fig. 9, because during the movement in the opposite direction the circuit is closed through pin 78 and the tool 40 is consequently lifted from the work. It will also be seen that the feed occurs during'the return stroke because his then that'ihe'pawl 51 moves the ratchet wheel 50 and consequently the tool and tracing point. The operator controls the amount of feed by adjusting the arm 54 on the throw out dog 53 so that the pin 55 will enter one of the lower holes 49 in quadrant 48 for a fine feed and one of the upper holes for a coarse feed.

Having described my invention, what I claim is- 1. Man engraving machine adapted to reproduce on a work table a copy held on a copy slide, a movable copy slide provided with a copyholding clamp having projections on the jaws thereof, and a stop located between and in the path of said projections.

2. In an engraving machine, a copy holding clamp consisting of jaws operated by a right and left hand screw, projections on saidjaws the distance between which is determined by the length of the copy, and an abutment located between said projections and serving as a stop therefor, whereby the length of the movement of the slide carrying said copy is determined by the length of the copy held in said clamp, substantially as set forth.

3. In an electrically operated engraving machine, a copy slide having adjustable stops thereon, a circuit breaker adapted to act as an abutment for one ofsaid stops, and a circuit maker adapted to act as an abutment for the other stop, whereby an electric circuit is alternately made and broken by the stopping of said slide.

4. In an electrically controlled engraving machine the engraving tool of which is held.

from cutting when the electric circuit is closed, a circuit opening and closing device operated by the movement of a copy carrying slide, and means whereby the opening and closing of said device take place alternately at the extremes of the slide movement.

5. In an electrical engraving machine, a vertical standard adapted to carry a vertically adjustable tool carrying head, a magnet supported in said tool carrying head, a vertical rod supported in said vertical standard and serving as part of the electric circuit,

and a sliding contact carried by the tool carrying head and serving as a connection between the magnet and said vertical rod.

6. In an engraving machine, an engraving slide and a revolving chuck supported on a bed, a rack secured to said slide, an idle gear supported by the bed and in mesh with the rack, a gear on the body of said chuck, and means for holding said chuck so that the gear thereon will be in mesh with either said rack or said idle gear.

7. In an engraving machine, a revolving chuck operated by a moving slide, and means for shifting said chuck in its support so that it will berotated either directly by said slide or through an intermediate gear, substantially as set forth.

8. In an engraving machine, a copy holding slide the length of whose movements are au- IIO tomatically determined by the length of the copy held thereon, a revolving chuck for holding circular work upon which said copy is to be reproduced, and means for shifting the position of said chuck so as to cause it to rotate in the right direction for eitherinside or outside engraving,substantially as described.

9. In an engraving machine, a copy slide and a work table having parallel and synchronous movements in the same direction of an adjustable ratio, a work holding chuck rotated by one of said slides, and means for shifting the connection of said slide to an intermediate gear whereby the direction of rotation of said chuck may be reversed in respect to the movement of said slide, substantially as, and for the purpose set forth.

10. In an engraving machine, an engraving tool and a hammer for striking it, and means for controlling the movements of said tool and said hammer by electrical connections made by the vibrations of a tracing point in passing over a copy.

11. Inan engraving machine, an engraving tool, a magnet for raising'said tool from and dropping it into a cutting position, an electrically operated hammer mounted above and adapted to strike upon said tool, a tracing point adapted to vibrate in passing over a copy, and electrical connections between said tracing point and said tool and also between said tracing point and said hammer.

12. In an engraving machine, an electrically controlled engraving tool, an electrically operated hammer arranged to strike upon said tool, electrical connections for said 'tool and said hammer, and a vibrating lever for making and breaking the connections for said tool and said hammer, said vibrating lever being controlled by a tracing point in passing over a copy.

CHARLES C. BRUOKNER.

Witnesses:

CHS. E. POTTER, B. A. MAHONY.

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