Title of Invention

AUTOMATIC DIAMOND BRUTING SYSTEM AND METHOD THEREOF

Abstract An automatic bruting system, comprising means to mount a rough diamond, means to mount a reference diamond, image capturing device to obtain a 2D image(s) of the rough diamond, image processing means to measure and convert the 2D image(s) into a 3D image(s), said image processing means compares the same with a reference 3D image and a feed back system to control, allow to arrange central axis (x-x) of the rough diamond in line with bruting axis by tilting the means and operate the bruting process by analyzing the compared image thereby obtaining a bruted diamond whereas the automatic bruting system have "on-machining" facility for planning and centering.
Full Text COMPLETE AFTER PROVISIONAL LEFT ON 31/5/06





FORM 2



THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
AUTOMATIC DIAMOND BRUTING SYSTEM;
JANAK MISTRY, AN INDIAN NATIONAL OF A-1, R.S. NO. 59, NEAR SOSYO CIRCLE, BAMROLI ROAD, OFF UDHANA MAGDALLA ROAD, SURAT - 395 017, GUJARAT, INDIA.


THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

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FIELD OF THE INVETION
The present invention relates to a bruting system, particularly to automatic bruting system for shaping round brilliant diamond before polishing.
BACKGROUND ART
Generally, diamonds available in nature are rough (shown in Fig. 5a having lot of concavities in girdle and faces and need cutting, bruting, polishing to obtain polished diamonds. The most common form of the polished diamond is a round brilliant where peripheral shape of the diamond is round with 16 digging on each end of the cylinder created by pavilion and crown halves (shown in Fig. 5b).
Bruting is a main process and is the process of physically shaping a diamond peripherally to its final form and a lathe used for bruting is known as Bruter. Conventional bruter comprises first pot for sticking a rough diamond; second pot for sticking a reference diamond for bruting of the rough diamond; two spindles for mounting said pots wherein said spindles rotate in the same direction with differential speed such that the diamonds get rub on each other to yield a final form of a diamond.
The presently available diamond bruters are operated manually and therefore worker has to judge the entire bruting process and also he has to judge profile of the rough diamond before bruting. However, it may include a manual error and may result in over or under bruting of the diamond, which is not profitable. Further, rough diamonds have normally a lot of concavities in girdle and faces, which is a major barrier to estimate the final
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yield of the polished diamond from the rough diamond. Also, every micron loss in the diamond results in cubic loss in weight of the diamond.
Further, the diamond being the hardest known material, diamond is required to brute the diamond. Therefore, wear and tear on the tool is substantial and much higher. Therefore, there is need of a bruting system, which provides "on machining" facility for planning and centering and also to provide assistance to the operator for tilting the stone thereby substantially estimating the final yield of the rough diamond and reducing the wear and tear of the bruting system.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method to brute a rough diamond to get a maximum yield of polished diamond from a rough diamond.
According to the first embodiment of the present invention, an automatic bruting system comprises of means to mount a rough diamond; means to mount a reference diamond; an image capturing device to obtain a 2D image(s) of the rough diamond; an image processing means to measure and convert the 2D image(s) into a 3D image(s), the image processing means compares the 2D image(s) with a reference 3D image; and feed back system to control, allow to arrange the central axis (x-x) of the rough diamond in line with a bruting axis by tilting the means and operate the bruting process by analyzing the compared image thereby providing on-machining facility.
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According to second embodiment of the present invention, the bruting system further comprises a laser line generator that projects laser on the rough diamond to capture sectional images(s) for measuring depth of cavity on the rough diamond.
According to third embodiment of the present invention method of bruting, comprises the steps of, mounting a rough diamond onto a spindle, mounting a rejection diamond onto an opposite spindle, obtaining a 2D image(s) of the rough diamond and converting in 3D image(s), comparing the 3D image(s) with a reference 3D image; analyzing both the image and defining central axis of the rough diamond; arranging the central axis (x-x) of the rough diamond in line with bruting axis; and rubbing the rough diamond with the reference diamond to obtain a bruted diamond wherein the bruting process is completely automatic and controlled by a software module to obtain a bruted diamond by providing on-machining facility.
The automatic bruting system according to the present invention adjusts the rough diamond defining a central axis (x-x) of the bruted diamond in order to obtain high recovery and profit. The bruting system provides a non-contact type measurement during the process and also measures the size of a rough diamond before and continuously during the process, which results in high recovery.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings are given by way of example and are not to be taken as limiting in any way. They are intended to make the invention easier to understand:
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Fig 1 shows perspective view of the present bruting system from top according to the present invention.
Fig 2 shows perspective side view of the bruting system.
Fig 3a and 3b shows rough & bruted diamond respectively.
Fig. 4 shows the flowchart of bruting process according to the present invention.
DETAILED DESCRIPTION OF THE PRESENT INVENTION:
The present invention relates to an automatic bruting system for shaping round brilliant diamonds, before polishing - integrating, on-machine centering, girdle digging information and cavity mapping. Means are provided to know the orientation of future facets and identify and also to consider for cavity locations and depth.
Bruting is a process of giving a predefined peripheral shape to the diamond. This profile defines the shape of the diamond. Automatic bruting system has the "on-machining" facility for planning and centering thereby minimizing the substantial micron loss in girdle while bruting.
Fig. 1 &2 shows a bruting system according to the present invention. The bruting system comprises means to mount a rough diamond; means to mount a reference diamond; image capturing device to obtain a 2D image(s) of the rough diamond; image processing means to measure and convert the 2D image(s) into a 3D image(s), said image processing means compares the same with a reference 3D image; and a feed back system to control, allow to arrange central axis (x-x) of the rough diamond in line with
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a bruting axis (not shown) by tilting the means and operate the bruting process by analyzing the compared image.
The rough diamond (14) and reference diamond (not shown) are mounted by conventional way on the said means i.e. spindle and pots (34). The pots are rotated in known way. The reference diamond used for rubbing is rejected /PCD (Poly Crystalline Diamond).
According to the present invention as illustrated in Fig.1 the image-capturing device is a CCD (Charge Couple Device) camera. The CCD (22) camera is aligned with the rough diamond to captures rotating image(s) of the rough diamond (14) preferably the CCD camera (22) captures the rotating image(s) of the rough diamond (14) against collimated back light background (12). The image(s) captured by the CCD camera (22) is a silhouette image(s).
According to the present invention the image processing means comprises of video capture card, a computer having a software module operatably connected to the CCD camera to digitize, analyze and conduct rough allocation of the rough diamond (14). The generated silhouette image(s) of the rough diamond (14) is digitized using frame grabber card or video capture cards. The digitized image(s) is used to build the 2D model of the rough diamond (14). The image(s) generated and digitized as aforementioned is analyzed by the software modules to measure various parameters of the diamond. The image processing means converts the silhouette image(s) of the rough diamond (14), which is a 2D (two dimensional) image(s) into 3D (three dimensional) image(s). Further the
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image processing means compares the 3D image(s) of the rough diamond (14) with the reference 3D image of the reference diamond. This reference diamond is an image of RBC (Round Brilliant Cut) diamond.
The software module of the present invention registers the index positions of the generated silhouette image(s) and generates 3D model of the rough diamond (14). Index positions of the silhouette image(s) are registered when the diamond is rotated on the spindle. Using this registration data the software module generates a 3D model of the rough diamond (14). Analysis of the 3D model, before starting of the bruting process with respect to the final recovery possible in the rough model. This helps the user in ascertaining the expected recovery from this rough, which will be very accurate. The software module analyses the 3D model before starting the bruting process and compares to the final recovery possible in the rough model, allocate the position of the rough diamond and feed to the feedback system. Further the software module is programmed in such a way that it defines the spinning speed of the stone to avoid fall off of the rough diamond.
The allocation also guides the user in deciding if the stone needs to be tilted to achieve higher recovery, yield and profit. It will help the user in balancing the naturals in the girdle. In reality the profile of a round brilliant is not a typical cylinder. In fact it has 16 facets at the pavilion and 16 facets at the crown, digging in at the round girdle. This results in thin girdle at some place and thick at the other. Also, the girdle break crown angle varies between a typical 34 degree to 43 degree in a single stone.
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The feedback system of the present invention connected with the image processing means is a rotational feed back system which tilts the spindle for arranging the central axis (x-x) of the rough diamond (14) to obtain higher recovery and profit.
Without the help of feedback on the orientation direction of the diamond, while it is being rotated on its axis, it is not possible to judge availability of space to generate these facets. With the introduction of the rotational feedback system (25) this would not have been possible. This is one of the way in which the present invention solves the purpose of the deficiencies of the prior art. The feedback system identifies circumferential profile of the rough diamond that is being bruted gives the rotational position of rough diamond (14) and compares the 3D image(s) generated with a reference 3D image of Round Brilliant Cut (RBC). Feedback system identifies circumferential profile of the rough diamond (14), maps and compares the 3D image(s) with a 3D image of Round Brilliant Cut (RBC), thereby resulting in formation of uniform girdles (24) at the facets (26).
In another embodiment of the invention, a Laser Line Generator (20) of the present invention is mounted on the bruting system and aligned to project the laser beam at the pre determined angle on the rough diamond (14) to check a section thereof. The Laser Line Generator (20) measures and considers the cavity (35) (as indicated in Fig. 2) existing on the rough diamond as indicated in Fig. 3a. These cavities are the major technological barrier in estimating the final yield of polish from the rough diamond (14). The Laser line Generator (20), when projected on the rough diamond (14),
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at a predefined angle, generates a profile. This information is sent to the software module, which analyzes to estimate the depth of the cavity (35) and feed to the feedback system to arrange the central axis (x-x) of the rough diamond (14). This depth is estimated which results in more fair plan and realistic estimation of profitability.
The Laser Line Generator (20) projects laser (30) on the rough diamond at a predetermined angle between 20° to 45° preferably at 30° Here the Laser Line Generator (20) measures the depth of cavity (35) on the rough diamond thereby obtaining a bruted diamond with minimum loss in weight.
According to the present invention a flow chart of the bruting process is shown in Fig.4. A rough diamond to be bruted is glued to a pot (34) and mounted on a spindle. A rejection sharp quality diamond or a rounded PCD is mounted on the opposite spindle. The spindle of the rough diamond (14) is rotated and an image(s) of the rough diamond (14) is captured by CCD camera (22). The image(s) captsured by the CCD camera (22) is silhouette image(s) that is a 2D image(s) is then digitized by the frame grabber or through video capture cards of the image processing means. These digitized image(s) will be used to build the 3D image(s) of the rough model.
The software module of the image processing means compares the 3D image(s) of the rough diamond with the 3D the reference image of the RBC diamond. The comparison is done by allocating the reference image in the 3D image(s) of the rough diamond with predetermined parameters which helps in highest possibility recovery and which removes wastages. Accordingly, the pot of the rough diamond is tilted in order to adjust the
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central axis (x-x) of the rough diamond (14) with the bruting axis. The operator would be able to check the location of the naturals w. r. t. graphical representation of the reference model. If necessary the operator would tilt the graph to balance the naturals. The diamond is studied for possible growing by tilting the table orientation. This is actually possible only because of the close loop feedback system (25) incorporated in the machine.
Also indicated if Fig.4 is a rough diamond (14), which is further studied, to accommodate facet junction bumps (36). The diamond profile is not simple cone at pavilion and truncated cone at the crown. In fact, it is quite complex. While deciding bruting axis this information is very vital.
When the diamond is moved with the spindle, because of the position feedback of the spindle (by rotary encoder (25) the graph will be moved accordingly by the software module. This will help the operator to take crucial decisions.
According to the embodiment as previously described Laser Line Generator (20) is switching on to check a section of the rough diamond and sends the information to software module. Before the Laser Line Generator (20) is switched on the rough diamond (14) is made opaque to visible light. Once the centering is completed, the total control is taken over by the machine. The image(s) of the rough diamond (14) are continuously taken to measure and analyze the size thereof while it is being processed. The rate of cutting will drop in three stages depending on the current diameter of the rough diamond (14) and its desired value. When the diameter of the rough
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diamond (14) to be bruted reaches the required value and zoeting allowance, the feeding in will stop. The machine intelligence takes care of the total control and decides when the rate of cutting has to be reduced and when it has to be taken to zoeting cycle.
The diamond girdle will be zoeted for a predefined time. Before terminating the process, the diamond will be measured again, indicating its current size and variation in measurement at various diametric locations. The out of roundness will be indicated on the screen. Bruting process automatically stops as when the desired parameter is achieved and the accuracy stoppage of the bruting system is as closed as 0.010mm to 0.015mm. Further the system according to the present invention requires less attendance during bruting process. Hence resulting in reducing of labor cost.
The foregoing description of the invention has been set for merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.
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I CLAIM
1. An automatic bruting system, comprising :
means to mount a rough diamond;
means to mount a reference diamond;
image capturing device to obtain a 2D image(s) of the rough diamond;
image processing means to measure and convert the 2D image(s) into a 3D image(s), said image processing means compares the same with a reference 3D image; and
a feed back system to control, allow to arrange central axis (x-x) of the rough diamond in line with bruting axis by tilting the means and operate the bruting process by analyzing the compared image thereby providing on-machining facility.
2. The automatic bruting system as claimed in claim 1, further comprises a laser line generator to project laser on the rough diamond to capture sectional image(s) for measuring the depth of cavity on the rough diamond.
3. The laser generator as claimed in claim 2, wherein the generator projects laser at a predefined angle.
4. The laser generator as claimed in claim 2, wherein the generator projects laser at angle between 20° to 45° and preferably at 30°.
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5. The automatic bruting system as claimed in claim 1, wherein the image-capturing device captures the rotating image(s) of the rough diamond against collimated back light background.
6. The automatic bruting system as claimed in claim 1 & 5, wherein the image-capturing device is preferably a CCD (Charge Couple Device) camera.
7. The automatic bruting system as claimed in claim 1, wherein the captured 2D image(s) of the rough diamond is a silhouette image(s).
8. The automatic bruting system as claimed in claim 1, wherein the image processing includes video capture card, a computer having a software module operatably connected to the image capturing device to digitize, analyze, and conduct rough allocation.
9. The automatic bruting system as claimed in claim 1, wherein the reference 3D image is an image of Round Brilliant Cut (RBC) diamond.
10. The method of bruting as claimed in claim 10, wherein the reference
diamond is a rejection quality sharp (diamond) or a PCD.
11. A method of bruting, comprising the steps of:
mounting a rough diamond;
mounting a reference diamond;
obtaining a 2D image(s) of the rough diamond and converting in 3D image(s);
comparing the 3D image(s) with a reference 3D image;
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analyzing both the images and defining central axis of the rough diamond;
arranging the central axis (x-x) of the rough diamond in line with bruting axis; and
rubbing the rough diamond with the reference diamond to obtain a bruted diamond by providing on-machining facility.
12. The method of bruting as claimed in claim 11, wherein 2D image(s) of the rough diamond is obtained in rotational position.
13. The method of bruting as claimed in claim 11, wherein the captured 2D image(s) of the rough diamond is a silhouette image(s).
14. The method of bruting as claimed in claim 11, wherein the image capturing device captures the rotating image(s) of the rough diamond against collimated back light background.

15. The method of bruting as claimed in claim 11, wherein reference 3D image is an image of RBC diamond.
16. The method of bruting as claimed in claim 11, wherein a feedback system receives information and final setting is adjusted accordingly.
17. The method of bruting as claimed in claim 11, wherein the spindle is tilted, oriented to arrange the centerline of the diamond with the rotational axis of the machine.
18. The method of bruting as claimed in claim 11, wherein the rough diamond is made opaque to visible light.
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1.9. The method of bruting as claimed in claim 11, further comprising the step of projecting a laser on the rough diamond to check a section of said rough diamond, transfers the information to software module thereby measuring depth of the cavity of said rough diamond before bruting process.
20. The method of bruting as claimed in claim 11, wherein bruting process automatically stops when desired parameters are achieved.
21. An automatic bruting system and a method of bruting as herein described and shown in Fig 1,2 and 3.
Dated this 31st day of May, 2005.


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ABSTRACT
An automatic bruting system, comprising means to mount a rough diamond, means to mount a reference diamond, image capturing device to obtain a 2D image(s) of the rough diamond, image processing means to measure and convert the 2D image(s) into a 3D image(s), said image processing means compares the same with a reference 3D image and a feed back system to control, allow to arrange central axis (x-x) of the rough diamond in line with bruting axis by tilting the means and operate the bruting process by analyzing the compared image thereby obtaining a bruted diamond whereas the automatic bruting system have "on-machining" facility for planning and centering.
31 MAY 2006
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Documents:

650-MUM-2005-ABSTRACT(19-6-2009).pdf

650-mum-2005-abstract(complete)-(31-5-2006).pdf

650-mum-2005-abstract(granted)-(6-9-2010).pdf

650-mum-2005-abstract-complete.doc

650-mum-2005-abstract-complete.pdf

650-mum-2005-cancelled pages(1-9-2009).pdf

650-MUM-2005-CANCELLED PAGES(19-6-2009).pdf

650-MUM-2005-CERTIFICATE(1-9-2009).pdf

650-MUM-2005-CLAIMS(1-9-2009).pdf

650-MUM-2005-CLAIMS(19-6-2009).pdf

650-MUM-2005-CLAIMS(AMENDED)-(9-4-2010).pdf

650-mum-2005-claims(complete)-(31-5-2006).pdf

650-mum-2005-claims(granted)-(6-9-2010).pdf

650-MUM-2005-CLAIMS(MARKED COPY)-(9-4-2010).pdf

650-mum-2005-claims-complete.doc

650-mum-2005-claims-complete.pdf

650-mum-2005-correspondence(1-9-2009).pdf

650-MUM-2005-CORRESPONDENCE(19-6-2009).pdf

650-MUM-2005-CORRESPONDENCE(9-4-2010).pdf

650-MUM-2005-CORRESPONDENCE(IPO)-(1-9-2009).pdf

650-MUM-2005-CORRESPONDENCE(IPO)-(19-6-2009).pdf

650-mum-2005-correspondence(ipo)-(8-9-2010).pdf

650-mum-2005-correspondence-received-010605.pdf

650-mum-2005-correspondence-received-310506.pdf

650-mum-2005-correspondence-received.pdf

650-mum-2005-descripiton (complete).pdf

650-mum-2005-descripiton (provisional).pdf

650-MUM-2005-DESCRIPTION(COMPLETE)-(1-9-2009).pdf

650-MUM-2005-DESCRIPTION(COMPLETE)-(19-6-2009).pdf

650-mum-2005-description(complete)-(31-5-2006).pdf

650-mum-2005-description(granted)-(6-9-2010).pdf

650-MUM-2005-DRAWING(1-9-2009).pdf

650-MUM-2005-DRAWING(19-6-2009).pdf

650-MUM-2005-DRAWING(9-4-2010).pdf

650-mum-2005-drawing(complete)-(31-5-2006).pdf

650-mum-2005-drawing(granted)-(6-9-2010).pdf

650-mum-2005-drawings.pdf

650-mum-2005-form 1(1-6-2005).pdf

650-MUM-2005-FORM 1(1-9-2009).pdf

650-MUM-2005-FORM 1(19-6-2009).pdf

650-mum-2005-form 18(27-4-2007).pdf

650-mum-2005-form 2(19-6-2009).pdf

650-mum-2005-form 2(complete)-(31-5-2006).pdf

650-mum-2005-form 2(granted)-(6-9-2010).pdf

650-MUM-2005-FORM 2(TITLE PAGE)-(1-9-2009).pdf

650-MUM-2005-FORM 2(TITLE PAGE)-(19-6-2009).pdf

650-mum-2005-form 2(title page)-(complete)-(31-5-2006).pdf

650-mum-2005-form 2(title page)-(granted)-(6-9-2010).pdf

650-mum-2005-form 2(title page)-(provisional)-(31-5-2005).pdf

650-mum-2005-form 5(31-5-2005).pdf

650-mum-2005-form-1.pdf

650-mum-2005-form-2-complete.doc

650-mum-2005-form-2-complete.pdf

650-mum-2005-form-2-provisional.doc

650-mum-2005-form-2-provisional.pdf

650-mum-2005-form-26.pdf

650-mum-2005-form-3.pdf

650-mum-2005-form-5.pdf

650-MUM-2005-GENERAL POWER OF ATTORNEY(1-9-2009).pdf

650-MUM-2005-MARKED COPY(1-9-2009).pdf

650-MUM-2005-POWER OF ATTORNEY(9-4-2010).pdf

650-mum-2005-specification(amended)-(1-9-2009).pdf

650-mum-2005-specification(amended)-(19-6-2009).pdf

650-MUM-2005-SPECIFICATION(AMENDED)-(9-4-2010).pdf

abstract1.jpg


Patent Number 242710
Indian Patent Application Number 650/MUM/2005
PG Journal Number 37/2010
Publication Date 10-Sep-2010
Grant Date 06-Sep-2010
Date of Filing 31-May-2005
Name of Patentee JANAK MISTRY
Applicant Address A-1, R.S. No.59, Near Sosyo Circle, Bamroli Road, Off Udhana Magdalla Road, Surat.
Inventors:
# Inventor's Name Inventor's Address
1 JANAK MISTRY A-1, R.S. No.59, Near Sosyo Circle, Bamroli Road, Off. Udhana Magdalla Road, Surat-395017
PCT International Classification Number B24B9/06 B24B9/16 B28D5/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA