I. While the diamond is being cut, the mem ber 26 gradually rises from the member 27, while the micrometer disk 34 owing to the action of the spring 35 slowly revolves, the index stop 40 approaches the stop 41 (Fig. n a stone carrier for diamond cutting machines, a stone support provided with 'a cup in which the stone to be cut is adapted to be placed, a rotatable mounting for said support the axis of rotation of said mounting being coincident with the axial dimension of said cup, and a stoneholding claw comprising a laterally extending holding portion resting when in position in a line with the axis of said rotatable mounting, and a cylindrical shank portion insertible in a recess provided in said support and held therein by lateral pressure produced by the pressure of said holding portion against the table of the stone to be cut. 
will have been taken off the diamond. Fig. The inner peripheral face thereof is coated with diamond powder.
A torsion spring 35 arranged within the screwed sleeve 33 tends to unscrew the latter (33). In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses. 
Fig. . Fig. During cutting the diamond held by the block 2 is constantly pressed against the inner peripheral face of the cylindrical wheel 1. I913- l fifi m 7D I Patented Apr. These claws secure the stone to be cut in position by pressing against the edges thereof but, if desired, another claw 20 may be substituted which secures the stone by pressin against the table. BriteCo's Diamond Engagement Ring Buying Trends: Lab-grown vs Natural. for holding the tools of drills of the point of twist drills, Concave-convex faceting method and apparatus, Non-contact machining of spherical surface, Spectacle-lens trimming,bevelling and grooving machines, Apparatus for polishing or forming facets on gems, diamonds, or the like, Method of grinding and polishing gem facets, Precision center lapping apparatus and method, Gauge for setting internally threaded blanks in a thread grinding machine, Attachment for grinding screw-threaded articles. In a diamond cutting machine a cutting surface, a stone support, a carrier provided with a conical recess, the axis of which is perpendicular to said cutting surface and a truncated conical extending portion forming a part of said support the axis of which is coincident with the axis of the stone when in' position on said support, said truncated portion and said recess forming means whereby said support may be completely rotated without movement to or from said cut-v ting surface. The spring 29 (Fig. Reciprocating motion is imparted to the block 2 by means of the helicoidal slot 11 in the bush 12 forming a cam. A machine for cutting diamonds in which the progress of the cutting operation is indicated mechanically comprising a micrometer, a-movable abutmeiit for the said micrometer, means by which the said micrometer is moved as the cutting operation proceeds and automatic means for the recut- 1 ciprocation of the dop carrier by which a movement is imparted'to it parallel with the plane of the cutting surface at the point of contact of the diamond with the latter, substantially as described. The said members are so formed that in the reciprocation of the dop carrier or frame, the projecting member is forced below the obstructing member and thus carries the dop carrier to an inoperative position where it reached the size of the first facet. Did You See July 2022 Jewels Of The Week? 1 51 of the core 48 is made of v The end copper. In a diamond cutting'machine, a carrier, a worm carried thereon, a spring cooperating between said carrier and said worm to advance said worm, a cutting surface, a stonev support mounted on said carrier worm to advance said worm,'a cutting surface, a stone support mounted on said carrier and adapted to be moved toward said cutting surface by the advance of said-worm, a scale wheel or micrometer attached to' to re-set the diamond in the axis of the dop. 6. 8 is a semi-development of the dop dividing-plate. The safety stop is -ad usted by pressing down the sleeve 43 s'o-that the shoulder 45 sleeve 43 when the index slider 40 touches the contact 41.- Should the contact 41 be-- come clogged and thus preventing'the closing of thesolenoid circuit the stone cannot be removed from the cutting surface, the. You are using an out of date browser. 14:. 5) is arranged in a threaded bush. A machine for cutting diamonds in which the progress of the cutting operation is indicated mechanically, comprising a ceeds and means by which the diamond is withdrawn from the cutting wheel when a facet has acquired the size determined by the micrometer, substantially as described. 3). One of the claws 19 securing the diamond is then removed and the dop 7 is turned on its axis so that the side of the diamond from "which the claw was removed can be placed against the wheel. 7. 796,323. of contact of the diamond with the said surface. r. Accordingto the invention, also, the micrometer may be provided as a body with a graduated disk carrying a cursor or slider which can be adjusted according to the thickness-which is required to be removed from the 'diamond. In a stone carrier for diamond cutting machines a stone support provided with recesses, and a stone holding claw provided with a cylindrical shank adapted to be inserted in one of said recesses and to be held therein by lateral presure produced by the pressure of the end of said claw against the stone to-be cut. ig. According to the invention means are provided for indicating mechanically the progress of the cutting operation, consisting of a micrometer mounted under the action of a spring and held in position by an adjustable abutment maintained in determined relation to the diamond, in such manner that, when the thickness of the diamond diminishes during the cutting operation, the abutment is moved accordingly and permits the micrometer to move under th action of its spring. In a stone carrier for diamond cutting machines, a stone sup ort provided with a cup in which the stone to be cut is adapted -to be placed and recesses adjacent thereto being adapted to be inserted in one of said recesses and to be held therein by lateral ressure produced by the pressure of said oldin portion against the stone to be cut. Underneath the dop there is arranged a each acet "of the diamond by placing the line corresponding to each facet exactly opgraduated ring 8 which is capable of being posite the pointer 24. Application fied October 20, 1913. 2) serves to support the frame 26 when the diamond is moved away from the wheel. a distance of 1 mm. In order to find the best direction for cutting, the sector support 22 (Fig.3) is slowly rotated until the index slider 40 approachesclose to the stop 41. 46 to pass underneath the end 51 of the core, the latter being lower thanthe and remains out of contact therewith owing to the catch 55 engaging a notch of the rack 32. for holding the tools of drills, Sharpening cutting edges, e.g. lower than the top peripheral edge .ofthe roller 46. In a diamond cutting machine, a cut-- ting surface, a carrier, a stone support o mounted on said carrier and capable of re ciprocal m'ovement thereon toward and from' said cutting surface, a spring on said carr er serving to press said support toward said cutting surface and a micrometer device interposed between said spring and said supto hold the stone to be out against s ting surface, a carrying element and means forming a part of one of said .elements and cooperating with the other of said elements for rotatably mounting said supporting element on an axis perpendicular to said cutting surface passing through the center of the stone to be cut when in position in said supporting element. Two ball bearings 28 and 28 guide the motion of the frame26 on the fixed plate 27. The cam 12 is secured in position upon the shaft-13 by means of collars 1 1 and 1 1. 8. 13. The said micrometer consists of a graduated disk 34 formed integral with a hollow screw 33 which is screwed into the plate 27. The catch 55 then engages one of the notches of the rack 32 and thus supports the member 26. According to the invention, also, the diamond can be completely finished with only two settings.
Before startin the safety stop Fig. Serial No. Through the reciprocating motion imparted to the block 2, the latter causes the roller. After having introduced the diamond into the wheel 1, the roller 16 is placed in the slot 11 of the cam 12 in order to impart to the block 2 a reciprocating motion; the catch 55 is then disengaged and owing to the pressure of the spring 56 .the diamond is pressed against the wheel and the recoil spindle 38 is adjusted so that after having screwed down the disk 34 by about one revolution corresponding to. safety stop prevents the stone from being out further when the faet is'of the required size. 1) revolves at a speed of about 2,000 revolutions per minute. of tools; Accessories therefor, e.g. 
According to the invention the dop is mounted upon the carrier through the medium of a member having a truncatedcone portion adapted to fit into a corresponding seating in the carrier, the diamond being maintained always on the axis of the cone. This invention relates to machines for cutting diamonds in which the diamond is carried by a stick or holder which can be adjusted at varying angles to the plane of the cutting surface on the wheel or lap for the cutting of facets on the stone in varying positions and can be adjusted about its own axis for the cutting of series of such facets. The shafts 13 and 13 are mounted in bearings 15 and 15. 
The dop is then lowered by pressing on the member 26. 4 is adjustably secured to the disk 34 and a projection thereon can contact with a stop at the end of an insulating plate 41, mounted on the plate 27 and electrically insulated from the latter. 1, For the purposeof cutting a fairly large diamond the claw 20 may be used by securing the point thereof on to the table of the stone, the claws 19 not being then required. A spiral spring 29 constantly tends to press the frame 26 away from the plate 27 and consequently to press the diamond against the wheel. A machine for cutting diamonds in which the progress of the cutting operation is indicated mechanically, comprlsing a micrometer, a movable abutment for the said micrometer and means by which the said micrometer is moved as the cutting operation proceeds, substantially as described. a-facet has acquired the ,size determined by. Again, a single claw may be employed adapted to press upon the table of the diamond, such claw being mounted adjacent the dop in such manner as to move with the dop when its axis is moved while permitting independent rotation of the dop about its axis for the cutting of the facets at the side of the table of the diamond. On the side of the frame 26 there is arranged a roller 46 (Fig. I I l 11% E. LERERRE. 4 1, The circumference of the micrometer disk '34 is divided into 200 equal parts; therefore when the index slider has approached the stop 41 to the extent of one division, a thickness of th of 2. mm. j j. 2). A bush or sleeve spindle 42. According to'the inventiomalso, the'combination of adop mounted in the manner described with. The roller 16 can be disengaged from the slot 11 so as to be able to slide the cam and collars ofi the shaft and remove the dop 7 from the machine (Fig. JavaScript is disabled. AUTOMATIC DIAMOND CUTTING AND POLISHING MACHINE. 9, 1918. is exactly opposite the index 24; the ring is then secured in position by means of the clamping screw 64. Should the diamond not be set accurately in the center of dop; in order to prevent its having to be loosened the member 52 is capable of being moved eccentrically in order What I claim and desire to secure by Letters Patent of the United States is 1. 6. d. capable of rotating on its axis while allowing the claw to press on the diamond. In a diamond cutting machine, a stone support, a cutting surface, a carrier on which said support is mounted, spring means cooperating between said carrier and said support to press said support toward said cutting surface and indicating means forming a part of said spring means whereby the rate and extent of movement of toward said cutting surface may be determined. A rack 32 (Fig. Tlfe claw 20 is arranged in a support 59 fixed on to the sector 21, so that the dop is the table. The dop is provided with eight holes or seatings in which can be inserted claws in the form of feet adapted to engage the sides of the diamond, three claws su cing to maintain the diamond rigidly in position so that it is always possible to remove a claw from a particular part of the diamond which it may be desired to out. I Be it known that I, EMILE LEPERRE, en gineer, a subjectof the King of the Belgians, and resident of 46 Rue du Champ, Berchem-Antwerp, Belgium, have invented a certain new and useful Automatic Diamond Cutting and Polishing Machine, of which the following is a specification. With the mechanism according to the invention it is not necessary to know the structure of the stone, the direction in which it should be out being determined automatically, while the cutting can be effected with as much ease in one direction or another without altering the adj ustment of the mechanism. The head of the latter sleeve can contact with the shoulder 45 of the frame 26. When starting to cut a facet, the distance between the index slider 40 and the stop 41 is adjusted according to the amount to be taken'off the diamond. The copper end 51 of the mildiron core 48 projects either in the path of or clear of the roller 46, according to whether the electric circuit is completed or not. Since-the stone is arranged in alinement with the axis of the cone 54 of the member 22, the cutting of all the facets of stone is proceeded with in the .same manner as for The first side facet of the diamond being cut the desired size, the graduated ring 8 arranged on the dop 7 is turned so that one of its dividing lines 60 (Fig. The table of the diamond being completed, the dop is placed. An index stop 40 (Fig.
On the completion of the cutting of a facet the adjustable cursor or slider of the micrometer closes the circuit of an velectromagnet or solenoid which thereupon moves an obstructing member into the path of a projecting member on the dop carrier. 2. AUTOMATIC DIAMOND CUTTING AND POLISHING MACHINE. dop is turned 4th and the process is the same as forthe firstone, and as the first. The machine is such that it can be used for the cutting of diamonds which hitherto it was found impossible to cut. In order to make the explanation given hereafter as clear as possible there are annexed drawings which show one form of the machine provided according to the invention', such machine being provided with a cylindrical cutting wheel or lap, which is preferable to the usual disk or plate lap. at a suitable angle, according to the thickness of the stone. the frame 26 cannot'eontinue to ascendwhen the index slider 40;;contact s against the stop 41. 1 and 1 show details of the regulating d'evice. ' The sector 21 (Fig. Qn the member6 (Fig. The block 2, the various members of which are hereinafter described, slides in a groove provided in the block support 6. To effect this the dop is provided wit-h eight holes drilled at equal distances within which the claws 19 can be securely mounted.
5) is adjusted so that contacts withQthe shoulder at the top of the. 5 shows details of the pressure regu- 'lating device with the safety stop. The invention has for its objects to provide an improved machine the operation of which is largely automatic, thus reducing the cost of labor, while at the same time the diamonds can be cut with the maximum of symmetry.
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