A DEVICE FOR MEASURING HEIGHT OF REVOLVING FLAT WIRE ON CARD OF A CARDING MACHINE

Abstract

 A device for measuring height of revolving flat wire on card comprises a support mechanism has two supporting bracket (15, 16) fitted on right and left side bends of a carding machine,a guide track (8) parallel to the revolving flat of carding machine is supporting a carriage(10) which is moved along the length of flat tops. The carriage (10) supporting a dial indicator (9) has a support bracket or stem (9c) supporting an anvil (9d) which presses on the tops of wire points and reading is shown in dial indicator. The carriage and dial indicator is moved up and down by precision slide and reading is set to zero when ends of flat tops is adjusted to same value. Further carriage measures the height at five points by sensor. The recorded reading is transmitted to a processor for analysis and storage and the exact amount of grinding cutting the flat tops is fed to the motor by precision feeding system. The carriage has differential speed while moving from one end to other end and a sensor is provided at each end of guide track by which reversal movement is controlled. Further carriage supporting a motor holding bracket (21) to mount a motor either with grinding or cleaning wheel. Exact amount of grinding cut is provided by means of rotation of cam controlled by the processor. Alternatively, the precision feeding system bracket 29 on which guide 33 is mounted whereby guide slide 31 is being moved on guide 33 by ball screw arrangement driven by a belt drive through a servo or stepper motor

Description

FIELD OF INVENTION

[0001] The present invention relates to a device for measuring a single as well as multiple number of flat tops fitted on flat bar in working position of a carding machine in particular, but not exclusively of clothing of flat tops of a revolving flat card in a textile machine. The measured height data thus collected is analysed on a computer and is used for undertaking Resharpening of the complete set of flat tops in situ. In addition to this device also can be used after replacing the height measurement device with cleaning, brushing wheel and a resharpening wheel to undertake cleaning and brushing of the flat tops as well as resharpening of the flat tops. Particularly this invention relates to a device for measuring height of wire fitted on revolving flat bar on card of a carding machine

BACKGROUND OF INVENTION

[0002] Spinning process of yarn involves cleaning and removing of impurities present in the fibre, aligning i.e. parallelizing of fibres and then spinning of fibre strands in a yarn. Various machineries are used in the spinning process to perform all these operations. The cleaning and aligning of fibres are mainly done on the first two process machineries i.e. Blow room and carding machines. Carding process involves extensive cleaning of impurities in the fibre mixing and separation of fibres to individual level. To facilitate separation of fibres to almost individual level the rollers and bars in the carding machine are clothed with clothing which comprises of wire teeth of various size and shapes according to requirements. These rollers and bars also work at a very close proximity and with different surface speed. A prior art carding machine is illustrated in Fig 1. The main working roller and bars are mentioned in the figure 1A. There is an enlarged view of the revolving flat in fig 1B. The carding machine mainly has three rollers known as Licker in 1, Main Cylinder 2, Doffer 4 shown in fig 1A. There are a number of bars known as flat bars which are mounted on the main cylinder and travel on an endless path around a portion of the main cylinder. All the three rollers are mounted with saw tooth wire with closely packed coils, so that the wire teeth extend radially on its surface. The flat bars 3a or 3c are clothed with Flat top 3b or 3d shown in fig 1B on enlarged scale and known as "revolving flat". The flat tops comprises of a flexible foundation on which wire staples of different type of cross section i.e. elliptical, ovoid or flat are pressed in. The end of the wire projecting from flexible foundation is bent in the intended direction so that it is opposite to that on main cylinder of motion of the revolving flats. The tip of the wire is ground on the top as well as sides to create a sharp wire points. These flat tops are mounted on the flat bars known as "bare flats". 3a.

[0003] The revolving flats covered with fine wire points of flat tops. It is also possible that the Flat bar 3c is clipped with metallic top i.e. saw tooth wire instead of flexible wire 3d. The relative direction of wire points on different components particularly rollers are provided on the basis of the action between two set of wire points. As shown in Fig 1A the direction of wire points in licker in and Cylinder are same. Hence it performs stripping action. The wire points in Main Cylinder and flat tops are opposite. Hence it performs carding action. For performing a good carding action it is preferred the cylinder should rotate at high speed i.e. with a high surface speed while the revolving flats move at a lower surface speed.

[0004] While material is fed in a carding machine, first the licker in roller takes small tufts of fibres from the feed rollers. These small tufts of fibres gets transferred to main cylinder clothed with finer wire points by stripping action. Hence the fibre tuft gets distributed on a higher number of wire points to facilitate intensive carding action between main cylinder and flat tops wire points. The transfer of fibre from Licker in to cylinder depends on various factors e.g. the angle of wire points, relative surface speed of the two components and most importantly the gap/gauge between the two clothed surfaces. The evenness of the gap between cylinder and licker in 6, between cylinder and flat tops 5 and between cylinder and doffer 7 are very crucial and important to achieve good and consistent performance from a carding machine. On prolong running of machine the wire points on components starts wearing off, particularly on flat tops due to flexible fine wires on flat tops. As a result the surface of the wire points on tops becomes uneven and worn out. The wire point in tops also gets clogged with impurities and short fibre as many a time the cleaning fillets on flat tops as provided in machine, leaves residual impurities on flat tops. In the conventional method the flat tops are taken out of the carding machine. It is then cleaned. The surface variation is checked and recorded manually with tops height measurement device. Based on the data collected the flat with lowest height reading and the highest reading decides the extent of grinding depth. The main purpose of grinding is to reshaping the points as well as has an even height reading in the whole revolving flat set. As the process of taking out flat tops out of card, taking readings and then resharpening and leveling is required considerable time, resulting stoppage of carding machine for long time, a process of grinding and leveling of flat tops on the card was started.

[0005] According to US patent 2005/0034278 of the present applicant discloses on the card resharpening and cleaning apparatus in carding machine. A full width roller mounted with stone or emery fillet was used for grinding. However as there is no provision of measuring of flat tops height is available till date, many a time excessive grinding cuts were given, as the setting of the grinding stone used to be done by looking at the flame of grinding.

[0006] With changed metallurgy of flat top wires for high production cards, these flame were not clearly visible, resulting excessive grinding cut and loss of card clothing life.

[0007] In the prior art provides an apparatus for both cleaning and resharpening of the flat tops in working position. However, this also had similar problem of selecting the grinding cut to be given and selection of flat tops to start the grinding operation. Hence all grinding devices which can undertake resharpening on Card had the inherent problem in checking of individual flat height measurement. Though there was a reduction of machine down time, there were always chances of excessive grinding due to unavailability of tops height data.

OBJECT OF THE INVENTION

[0008] One of main objects of this invention is to mitigate above mentioned drawbacks.

[0009] Further object is to grind the wires of flat clothing as required so that even grinding is carried out.

[0010] Further object is to measure the height of the wires and accordingly grinding stone is adjusted and life of wires of flat is more compared to earlier.

[0011] Another object is stoppage time reduced and evenness of wires is uniformly maintained.

[0012] Another object is measuring, cleaning and grinding is done simultaneously to reduce the down/stoppage time

[0013] These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION

[0014] The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.

[0015] Accordingly, in one aspect of the present invention there is provided a device for measuring height of a revolving flat wire/top on card of a carding machine, said device comprising:

a support mechanism having two supporting brackets;

a guide track substantially parallel to the revolving flat wire/top of the carding machine supporting a carriage assembly movable along the length of the flat tops

wherein said carriage assembly comprises a carriage, a dial indicator in operative engagement with said carriage;

wherein said dial indicator comprising a support bracket or stem operatively connected to an anvil such that the dial indicator is adapted to measure readings corresponding to the operative engagement of the anvil with the said tops of wire points;

wherein the carriage assembly moves in up and down direction by means of a precision slide along with the said guide track; when height at both ends of the flat tops being adjusted to same value, the dial being set to zero carriage is being moved from one end to other ends of flat tops and measurements at predetermined points being recorded in the dial;

wherein data of height readings of flat tops being transmitted to a processor means which processes the entire data collected from all flat tops for recording, analysis and storage wherein the exact amount of grinding cutting the flat tops is fed to the motor by precision feeding system.

[0016] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF OF DESCRIPTION OF INVENTION

[0017] The device comprises of a support mechanism as explained in Fig 2. Two supporting brackets are fitted on right and left side bend of a carding machine. On these brackets a guide track is fitted which is parallel to the revolving flat of carding machine. The guide track supports a carriage which is moved along the length of flat tops fitted on the flat bar 3A.

[0018] The linear drive mechanism allows the carriage to move at controlled speed, which can be manually adjusted as desired. The movement of the carriage can have differential speed while it moves from one end to other and returns back. The extent of travel of the carriage 10 can be adjusted by sensors 12 & 12a fitted on both end of the guide track. The carriage supports a dial indicator 9. The dial indicator is preferably a digital dial indicator. The Dial indicator has a support bracket on which dial indicator is fitted. Reading in the dial is shown according to the movement of anvil which is fitted on the bottom portion of bracket. The anvil has a smooth hardened flat surface which rests on the flat tops wire points. During working of this device the anvil presses on the tops wire point. The whole assembly of the track along with the carriage and the dial indicator can be moved in up or down position by means of a precision slide 13 shown in Fig 2. The slide has a screw along with dialed knob 14. By rotating the knob in clockwise or anticlockwise the whole guide track can be brought in up or down position. The Guide track can be precisely adjusted on the revolving flat top by adjusting the slide. Once the height reading at both ends of the flat tops are adjusted to same value, the setting button on the dial can be pressed to make the reading zero. Once the power to the linear propulsion system of the guide track is provided, the carriage starts moving from one end of the revolving flat to the other end measuring the height of the flat bar mounted with tops. On reaching the end position of the flat tops the sensor 12 gets activated. This causes reversal of movement of the carriage. The carriage with the assembly returns back to the original position and comes to rest. On the machine a sensor 17 is provided at the end of flat bar as detailed in Fig 4. As the revolving flat moves on an endless path above cylinder, the next flat bar with tops activates the sensor 17. On receiving the signal from sensor the carriage on the guide track starts movement along the length of the revolving flat. The dial starts measuring the readings at five predetermined points. After reaching the end of the top, the sensor no12 again gets activated and the movement reverses. On reaching the end of the path, the carriage comes to stop as it is sensed by sensor 12a. The Tops height data are transmitted through the data cable to a data processor with data logging software and PLC System. Arrangements are made so that data is collected during movement of the dial only in one direction at a specified time gap. Hence it is assumed that it takes 10 second for the dial to travel from one end of flat top to the other end, the arrangements in the processor can be made so that the dial reading data can be collected every 2 seconds once the dial starts moving from right to left direction. Hence the tops height data at five distinctive places of all flat tops can be collected. The data gets logged in the processor. The whole set of data from the processor gets transmitted by WIFI router Fig 4 to any laptop or computer for its recording, analysis and storage.(The inter connectivity of the components is required to be mentioned with corresponding drawing) The data can be analysed to find lowest and highest reading of the whole tops set. Based on the data collected decision is taken on selection of the first top from which the grinding operation to be started and the exact amount of predetermined cut is given. The direct data logging is also possible from Bluetooth enabled dials, where the data is transmitted without any cable directly to the computer through specially designed software.

[0019] In another embodiment where the carriage 10 in addition to the dial can have provision of a motor holding bracket where motor is mounted. The carriage 10 is provided with the motor holding bracket 21 where the motor 22 is mounted. Further grinding wheel 23 is driven by the motor via a shaft. This grinding wheel can be also replaced with a cleaning Brush when cleaning of wires of flat bar is necessary. The precision entry of data in the system is carried out for feeding of analyzed data to a system where it is provided with a cam 26 which can be rotated by a servo controlled motor or a stepper motor drive system. The exact amount of grinding cut can be provided by means of rotation of the cam controlled by the processor Further grinding and cleaning are done simultaneously with measuring of wires of flat bars.

[0020] In another embodiment shown in fig 9 the guide track 8 is supported on slide 31 fitted on guide 33 and Z bracket 34 arrangement shown in fig 11 is provided on each of supporting brackets 29 at both sides. Each slide 31 on the bracket is driven by servo motor or stepper motor through belt and ball screw arrangement. The input to the servo motor or steeper motor is provided by individual controller 30 as shown in fig 10. The guide track 8 with carriage 10 is provided with a provision for assembling of dial and motor holding bracket with motor.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0021] The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

FIG. 1 shows a schematic diagram of a Carding machine of the prior art.

FIG. 1A shows the main working roller and bars of the carding machine.

FIG. 1B shows an enlarged view of the revolving flat in the carding machine.

FIG. 2 shows the schematic diagram of apparatus with dial indicator for height measurement

FIG. 3 shows the diagrammatic view of a part of the guide track with dial fixtures

FIG. 4 shows the schematic diagram of the complete apparatus with dial, sensor, processor and computer.

FIG. 5 shows the apparatus with dial indicator for height measurement and motor drive arrangement for rotating brush wheel and grinding wheel

FIG. 6 shows the enlarged view of the arrangement of the carriage with dial indicator and motor with brackets

FIG. 7 shows the diagram of the motor with grinding wheel

FIG. 8 shows the schematic diagram of the precision feed arrangement with electronically controlled motor drive system.

FIG. 9 shows schematic diagram of another precision feed arrangement with slides driven by electronically controlled motor drive system.

FIG. 10 shows schematic diagram of the precision feed arrangement for precisely adjusting the guide track with grinding motor and grinding wheel arrangement.

FIG. 11 shows the views of the bracket arrangement with slide, guide, "Z" brackets, guide track with dial, electronically controlled motor and Electronic Controller.

[0022] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PREFFERED EMBODIMENT WITH DRAWING

[0023] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

[0024] Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0025] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

[0026] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0027] By the term "substantially" it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.

[0028] Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.

[0029] It should be emphasized that the term "comprises/comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
Accordingly, the device of the present invention comprises a support mechanism as explained in Fig 2. The supporting brackets 15 & 16 are fitted on RH and LH side bend of a carding machine. On these brackets a guide track 8 is fitted which is parallel to the revolving flat 3. The guide track 8 supports a carriage 10 which can move along the length of flat tops 3b shown in fig 1B fitted on the flat bar 3A shown in fig 1B. The linear drive mechanism allows the carriage 10 to move at controlled speed, which can be manually adjusted as desired. The movement of the carriage 10 can have differential speed while it moves from one end to other and returns back. The extent of travel of the carriage 10 can be adjusted by sensors 12 & 12a fitted on both end of the guide track. The carriage supports a dial indicator 9. The dial indicator preferably a digital dial indicator in detailed is shown in Fig3. The Dial indicator have a support bracket or stem 9 a, a dial which shows the readings 9b, a bottom stem 9c supporting an anvil 9d.

[0030] The anvil has a smooth hardened flat face which rests on the flat tops wire points. During working of this device the anvil presses on the tops wire point. The whole assembly of the track8 along with the carriage and the dial indicator can be moved in up or down position by means of a precision slide 13 shown in Fig 2. The slide has a screw along with dialed knob 14. By rotating the knob in clockwise or anticlockwise the whole guide track can be brought in up or down position. The Guide track can be precisely adjusted on the revolving flat top by adjusting the slide.

[0031] Once the height reading at both ends of the flat tops are adjusted to same value, the setting button on the dial can be pressed to make the reading zero. Once the power to the linear propulsion system of the guide track is provided, the carriage starts moving from one end of the revolving flat to the other end measuring the height of the flat bar mounted with tops. On reaching the end position of the flat tops the sensor 12 gets activated. This causes reversal of movement of the carriage. The carriage with the assembly returns back to the original position and comes to rest. On the machine a sensor 17 is provided at the end of flat bar as detailed in Fig 4. As the revolving flat moves on an endless path above cylinder, the next flat bar with tops activates the sensor 17. On receiving the signal from sensor the carriage on the guide track starts movement along the length of the revolving flat. The dial starts measuring the readings at five predetermined points. In another arrangement five sensors 35 in Fig 10 are placed at five predetermined points. While the dial passes over the points, it sends signal through control panel to capture reading of height on that particular point. Hence the top height data at five distinctive places can be collected...

[0032] After reaching the end of the top, the sensor 12 again gets activated and the movement reverses. On reaching the end of the path, the carriage comes to stop as it is sensed by sensor 12a. The Tops height data are transmitted through the data cable to a data processor with data logging software and PLC System. Arrangements are made so that data is collected during movement of the dial only in one direction at a specified time gap. Hence say it takes 10 second for the dial to travel from one end of flat top to the other end, the arrangements in the processor can be made so that the dial reading data can be collected every 2 seconds once the dial starts moving from right to left direction. Hence the tops height data at five distinctive places of all flat tops can be collected. In another arrangement five sensors are placed at five predetermined points as shown in fig 10. While the dial passes over the sensors at these points, it sends signal through control panel to capture reading of height on that particular point. Hence the top height data at five distinctive places is collected.

[0033] The data gets logged in the processor. The whole set of data from the processor gets transmitted by WIFI router 19 Fig 4 to any laptop or computer 20 for its recording, analysis and storage. The data can be analysed to find lowest and highest reading of the whole tops set. Based on the data collected decision can be taken on selection of the first top from which the grinding operation to be started and the exact amount of grinding cut to be given. The direct data logging is also possible from Bluetooth enabled dials, where the data is transmitted without any cable directly to the computer through specially designed software.

[0034] In another embodiment in detailed is shown in Fig 5 where the carriage 10 in addition to the dial can have provision of a motor holding bracket where motor is mounted. In Fig 6 the carriage 10 have the motor holding bracket 21 with the motor 22.in enlarged scale.

[0035] In Fig 7 the motor is fitted with a grinding wheel 23. This grinding wheel can be also replaced with a cleaning Brush. The precision feeding system for feeding of analyzed data as shown in fig8 can have a cam 26 which can be rotated by a servo controlled motor or a stepper motor drive system. The exact amount of grinding cut can be provided by means of rotation of the cam controlled by the processor.

[0036] The precession feeding system as shown in FIG 8 comprises the slide 13 mounted a plate 28 which extends outside. These plates have rollers 27 which are in point contact with a cam 26. The arrangements are made in such a way that when the cam 26 is rotated the roller 27 will move the whole plate with slide in upward or downward direction. If the offset of the cam is 2.5mm, then for 90-degree rotation of the cam the plate with slide on which the guiding track with carriage is fitted, can move 2.5mm in up or downward direction. Once the total grinding cut and the depth of cut is fed in the processor shown in FIG 8, the servo / stepper motor rotates the cam suitably to start the grinding process. After one complete revolution of the revolving flat as sensed by the sensor 17 in FIG 4, the servo / stepper motor once again provides the next grinding feed. Once the total grinding cut is provided, the servo / stepper motor retract back the track with carriage by rotating the cam in reverse direction to original position. In another arrangement the precision feeding system is shown in FIG 11 which comprises the brackets 29 on which guide 33 is fitted. Slide 31 moves on guide 33 by means of a ball screw arrangement driven by a belt drive through a servo or stepper motor 32. Input to the servo/ stepper motor is provided by controller 30. Input to the controller can be given manually or through the main Electronic Controller. Guide track 8 is fitted on the slide 31 by means of "Z" brackets 34. The Guide track 8 with carriage 10 have provision for assembling of the digital dial as shown in FIG 9 and motor holding bracket with motor and grinding wheel is shown in FIG 10.

[0037] During the tops height measurement first the guide track 8 is to be set parallel to the tops. For adjusting the height of the guide track with digital dial over tops, first the measurement is taken on both ends of the top. Based on the readings on both ends, required amount of adjustment is to be fed in the controller 30 to make dial reading equal at both ends. Once the motor 32 gets input from controller 30, the calibrated rotation of motor shaft moves the slide 31 through a belt drive and ball screw arrangement. The slide moves the desired distance over the Guide 33.
Similarly while conducting grinding operation the desired amount of grinding cut is fed to the controllers 30 as shown in Fig 10, the servo / stepper motor moves the slide 31 suitably to start the grinding process. After one complete revolution of the revolving flat as sensed by the sensor 17 as shown in FIG 4, the servo / stepper motor once again provides the next grinding feed. Once the total grinding cut is completed, the servo / stepper motor retract back the track with carriage by moving the slide in reverse direction to original position.

Claims

1. A device for measuring height of a revolving flat wire/top on card of a carding machine, said device comprising:

a support mechanism having two supporting brackets (15, 16);

a guide track (8) substantially parallel to the revolving flat wire/top of the carding machine supporting a carriage assembly movable along the length of the flat tops wherein said carriage assembly comprises a carriage (10), a dial indicator (9) in operative engagement with said carriage (10);

wherein said dial indicator (9) comprising a support bracket or stem (9c) operatively connected to an anvil (9d) such that the dial indicator (9) is adapted to measure readings corresponding to the operative engagement of the anvil with the said tops of wire points;

wherein the carriage assembly moves in up and down direction by means of a precision slide (13) along with the said guide track; when height at both ends of the flat tops being adjusted to same value, the dial being set to zero carriage is being moved from one end to other ends of flat tops and measurements at predetermined points being recorded in the dial;

wherein data of height readings of flat tops being transmitted to a processor means which processes the entire data collected from all flat tops for recording, analysis and storage wherein the exact amount of grinding cutting the flat tops is fed to the motor by precision feeding system.

2. The device as claimed in claim 1 wherein said precision slide (13) comprising a screw along with rotating dial knob rotated in clockwise or anticlockwise direction through which entire guide track is moved up or down position.

3. The device as claimed in claim 1 or 2 wherein the guide track is precisely adjusted on the revolving flat top by adjusting said precision slide (13).

4. The device as claimed in claim 1, 2 or 3 when the reading of height at both ends are adjusted to same value, the dial is set to zero.

5. The device as claimed in claim 1 wherein measurement at plurality of different points is carried out by the dial.

6. The device as claimed in claim 1 or 4 wherein a plurality of sensors are placed at predetermined points and when dial passes over sensors it sends signal through control panel to capture reading of said particular points.

7. The device as claimed in claim 1 wherein said carriage is having differential speed while moving from one end to other end.

8. The device as claimed in claim 1, 2 or 3 where said guide track comprising plurality of sensor at each end of the guide track adapted to control reversal movement.

9. The device as claimed in claim 1 further comprising a sensor (17) provided at the end of flat bar, wherein upon activation of the sensor, top height is measured on next flat bar with tops as it rotates on the side bends.

10. The device as claimed in claim 1 or 7 wherein said carriage assembly further comprising a motor holding bracket (21) adapted to mount a motor (22).

11. The device as claimed in claim 1 further comprising a precision feeding arrangement for feeding analyzed data for grinding the flat tops having a cam which is rotated by a servo controlled motor or stepper motor drive system.

12. The device as claimed in claim 11 wherein exact amount of grinding cut is provided by means of rotation of the cam controlled by the processor.

13. The device as claimed in claim 11 or 12 wherein precision feeding arrangement comprising precision slide (13) mounted on a plate (28) extending outside and having rollers (27) in contact with a cam and on rotation of the cam said roller (27) facilitates movement of the entire plate with precision slide (13) in upward and downward direction.

14. The device as claimed in claim 11, 12 or 13 wherein the precision feeding arrangement comprising bracket (29) on which guide (33) is operatively mounted whereby guide slide (31) is being moved on guide (33) by ball screw arrangement driven by a belt drive through a servo or stepper motor.

15. The device as claimed in claim 1, 7, 10 and 14 wherein said guide track (8) is mounted on the slide guide (31) by means of substantially "Z" shaped bracket (34) whereby guide track (8) with carriage (10) provided with digital data and motor holding bracket fitted with motor and either with grinding wheel or cleaning wheel is supported by motor shaft.

Drawing