Claims::We claim:
1) An apparatus (200) for chamfering cylindrical objects, said apparatus comprising:
a) a base table (20) configured in two sections (top section (T) and bottom section (B) ) provided with a plurality of projections (P1) defining a space in between therein on cross columns at its top section (T), a plurality of projections (P2) extending upwards and downwards on cross columns at its top section (T), a L shaped column (LC) and a projection (P3) on one edge at its top section and a pair of projections (P4) diagonally facing each other defining a space in between therein on other edge at its top section;
b) a plurality of support rollers (22) adapted to configure in between the plurality of projections (P1) of said base table (20) in a freely rotatable condition;
c) a pair of workpiece contact guide rollers (24) comprising a cylindrical rod coupled with a cylinder of bigger diameter at their one end, said pair of workpiece contact guide rollers (24) adapted to configure in between the plurality of projections (P2) extending upwards from said base table (20) in a freely rotatable condition;
d) a non workpiece contact guide roller (26) adapted to configure in between the plurality of projections (P2) extending downwards from said base table (20) in a freely rotatable condition;
e) a belt tensioning mechanism (30) comprising a guide screw (302), a guide plate (304), a mounting plate (306), a pair of fingers (308), a tensioning roller (310) and a rotating handle (312), said mounting plate (306) mounted on a vertical column of said base table (20), said guide screw (302) adapted to pass through the mounting plate (306) and the vertical column of the base table (20) is coupled to the guide plate (304) at one end and the rotating handle (312) at other end, said pair of fingers (308) coupled to said guide plate (304) providing a space in between therein, said tensioning roller (310) adapted to configure in between the pair of fingers (308) in a freely rotatable condition;
f) a drive motor (32) mounted on cross columns at the bottom section (B) of said base table (20);
g) a belt (28) encompassing shaft of the drive motor (32), the pair of workpiece contact guide rollers (24), the non workpiece contact guide roller (26) and the tensioning roller (310);
h) a workpiece (46) mounted on the plurality of support rollers (22) in such a way that tubular surface of the workpiece (46) is in contact with the cylinder of bigger diameter of the pair of workpiece contact guide rollers (24);
i) a grinding machine (40) comprising a motor (402), a grinding wheel (404), a swivel joint (406) and a handle (408), said swivel joint (406) pivoted in between the pair of projections (P4) of the base table (20) in such a way that flat face of the grinding wheel (404) engages with edge of the workpiece (46) at a predetermined angle while chamfering;
j) a pneumatic actuator (38) mounted on the L shaped column (LC) of the base table (20);
k) a limiting roller holder (36) configured with a pair of limiting rollers (34) therein in a freely rotatable condition is coupled to piston of the pneumatic actuator (38), said pair of limiting rollers (34) engages with tubular surface of the workpiece (46) at the beginning of chamfering operation; and
l) a stopper mechanism (42) comprising a cylindrical rod (422), a hollow cylinder (424), a stopper plate (426) and an arresting wheel (428), said hollow cylinder (424) provided with the stopper plate (426) on one side of tubular surface and a threaded hole (H14) on other side of tubular surface adapted to pass through the cylindrical rod (422), said cylindrical rod (422) coupled to the projection (P3) of the base table (20) at one end and the L shaped column (LC) of the base table (20) at other end, said arresting wheel (428) engages with the threaded hole (H14) of the hollow cylinder and arrests the stopper plate (426) at desired position and desired angle adjoining the workpiece (46) over the cylindrical rod (422).

2) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1, wherein said plurality of support rollers (22) and said cylinder of bigger diameter of the pair of workpiece contact guide rollers (24) are of same diameter.

3) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1,
wherein rotation of said pair of workpiece contact guide rollers (24) facilitates in rotation of the workpiece (46).

4) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1, wherein said belt (28) mates at portion of cylindrical rod of the pair of workpiece contact guide rollers (24).

5) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1, wherein backward movement of said tensioning roller (310) adds tension in the belt (28) and forward movement of said tensioning roller (310) releases tension in the belt (28).

6) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1, wherein said workpiece (46) is a solid cylinder or hollow cylinder.

7) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1,
wherein backward movement of said workpiece (46) while chamfering is arrested by the stopper plate (426) and upward movement of said workpiece (46) while chamfering is arrested by the pair of limiting rollers (34).

8) An apparatus (200) for chamfering cylindrical objects as claimed in claim 1, wherein said plurality of support rollers (22), said pair of workpiece contact guide rollers (24), said non workpiece contact guide roller (26), said pair of limiting rollers (34) and said tensioning roller (310) are in freely rotatable condition by means of a plurality of cylindrical pins.

9) A method of chamfering cylindrical objects on an apparatus (200), said method comprising the steps of :
a) mounting a workpiece (46) on a plurality of support rollers (22) in such a way that tubular surface of the workpiece (46) mates with a cylinder of bigger diameter of a pair of workpiece contact guide rollers (24);
b) arresting backward movement of said workpiece (46) by locking a stopper plate (426) at desired position and desired angle adjoining the workpiece (46) over a cylindrical rod (422) of a stopper mechanism (42) through rotation of an arresting wheel (428);
c) arresting upward movement of said workpiece (46) by engaging a pair of limiting rollers (34) with tubular surface of the workpiece (46) through opening of piston of a pneumatic actuator (38);
d) supplying power to a drive motor (32) rotates shaft of the drive motor (32) in anti clockwise direction which in turn rotates the pair of workpiece contact guide rollers (24), a tensioning roller (310) in anti clockwise direction and a non workpiece contact guide roller (26) in clockwise direction by means of a belt (28), said rotation of the pair of workpiece contact guide rollers (24) in anti clockwise direction facilitates in rotation of said workpiece (46) in clockwise direction; and
e) supplying power to a grinding machine (40) rotates a grinding wheel (404)
in clockwise direction, said grinding wheel (404) flat face engaged with edge of the workpiece (46) at a predetermined angle produces a chamfer at the edge of the workpiece (46) due to friction.

10) A method of chamfering cylindrical objects on an apparatus (200) as claimed in claim 8, wherein rotation of said workpiece (46) in clockwise direction rotates the plurality of support rollers (22) and the pair of limiting rollers (34) in anti clockwise direction. , Description:FIELD OF THE INVENTION:
The present invention relates to an apparatus for chamfering. Particularly, the present invention relates to an apparatus for chamfering specifically cylindrical objects.

BACKGROUND OF THE INVENTION:
Figure 1(a) illustrates a perspective view of a pipe.

Figure 1(b) illustrates a perspective view of pipe of figure 1(a) after chamfering.

Generally, Pipes are produced in different lengths by pipe manufacturing industries. However, pipes cannot be produced beyond a certain length to facilitate in transportation. So, to build pipes of greater lengths, welding operation is performed by joining ends of pipes of standard lengths. For welding operation to be performed, chamfering is done to the ends of the pipes as shown in the figure 1(a) such that the filler material is filled at the chamfered portion of the adjoining pipes.

Figure 2 illustrates a perspective view of conventional apparatus for pipe chamfering.
The conventional apparatus 100 for pipe chamfering comprises a table 10, a pipe 12 and a grinding machine 14. The pipe 12 is placed on the table 10 and an operator holds the pipe 12 with one hand and holds the handle of the grinding machine 14 with other hand. The operator adapts to position the grinding wheel of the grinding machine 14 at an angle such that the flat face of the grinding wheel touches the end of the pipe 12. Now, the grinding wheel of the grinding machine 14 is rotated, simultaneously rotating the pipe 12
over the table 10 by the operator, to form a chamfer around the periphery of the pipe 12.
This method of chamfering pipes requires skill of the operator as rotation of the grinding wheel and rotation of the pipe by the operator should go in tandem otherwise non uniform chamfer occurs over the periphery of the pipe which in turn results in poor quality weld.

Several techniques have been disclosed in the prior art for chamfering of pipes.

US Patent no. 7578643 filed on December 30, 2008 titled “Simultaneous Pipe Cutting and Chamfering Device” discloses a mobile device for simultaneously cutting and chamfering a pipe comprising a frame, at least one pipe collet-clamp coupled to the frame and defining a principal axis, a split carriage rotatably mounted with respect to the frame about the axis and adjacent to the clamp, a router affixed to the split carriage and having a cutting-chamfering bit, and a drive motor for rotating the carriage. The router orbits around the pipe and simultaneously cuts into two chamfered pipes. The main drawbacks of this invention are, it has lot of components, the method of chamfering is complicated as pipe remains stationary and a router having cutting-chamfering bit attached to split carriage rotates along with split carriage around the periphery of the pipe performing cutting-chamfering operation, pipe collet clamps needs to be replaced for different sizes of pipes, split carriage drive mechanism is complex as it involves a plurality of gears, a plurality of pipe contact rollers and a plurality of carriage guide rollers and requires skilled labour.

US Patent Application Publication no. 20010001935 published on May 31, 2001 titled “Method and Apparatus for Cut Grooving and Chamfering a Cylindrical Pipe Section” discloses an apparatus for chamfering cylindrical pipe section comprising a support frame, a plurality of rollers adapted for positioning and gripping the pipe section for chamfering in fixed predetermined relation with respect to the support frame, a chamfer cutting tool positioned at a predetermined location with respect to the support frame, a drive mechanism for engagement of the chamfer cutting tool with the pipe section and a drive mechanism for providing relative rotation between the support frame and the pipe section. The main drawbacks of this invention are, it has lot of components, the engagement of the chamfer cutting tool with the pipe section is done inside the support frame manually and is not clearly visible to the operator, the plurality of rollers which engages with inner diameter of the pipe section to facilitate in rotation of the pipe section by manual rotation needs to be replaced for different sizes of pipes and requires skilled labour.
US Patent no. 6129488 filed on January 28, 1997 titled “Pipe cutting and chamfering arrangement” discloses a device for chamfering thin walled pipes comprising a drive unit with tools arranged on its shaft is manually guided around a pipe that is clamped in a vice by means of clamping jaws. The main drawbacks of this invention are, it is complicated as the pipe remains stationary and the drive unit along with chamfering tool is concentrically guided around the pipe for chamfering, the clamping jaws needs to be replaced for different sizes of pipes and requires skilled labour.

Therefore, there is felt a need for development of an apparatus for chamfering cylindrical objects to overcome the drawbacks of prior art and which can accommodate chamfering cylindrical objects of different sizes.

OBJECTS OF THE INVENTION:
An object of the present invention is to provide a simple apparatus for chamfering of cylindrical objects.

Another object of the present invention is to provide an apparatus for chamfering cylindrical objects of different sizes.

One more object of the present invention is to provide a fool proof apparatus for chamfering of cylindrical objects.

Still another object of the present invention is to provide an apparatus for chamfering of cylindrical objects which can be even operated by unskilled labour.

Further another object of the present invention is to provide an apparatus which can perform chamfering on cylindrical objects in less cycle time.

Yet one more object of the present invention is to provide an apparatus which can perform uniform chamfer on cylindrical objects.

SUMMARY OF THE INVENTION:
In accordance with the present invention an apparatus for chamfering cylindrical objects is provided, said apparatus comprising:
i) a base table (20) configured in two sections (top section (T) and bottom section (B) ) provided with a plurality of projections (P1) defining a space in between therein on cross columns at its top section (T), a plurality of projections (P2) extending upwards and downwards on cross columns at its top section (T), a L shaped column (LC) and a projection (P3) on one edge at its top section and a pair of projections (P4) diagonally facing each other defining a space in between therein on other edge at its top section;
ii) a plurality of support rollers (22) adapted to configure in between the plurality of projections (P1) of the base table (20) in a freely rotatable condition;
iii) a pair of workpiece contact guide rollers (24) comprising a cylindrical rod coupled with a cylinder of bigger diameter at their one end, the pair of workpiece contact guide rollers (24) adapted to configure in between the plurality of projections (P2) extending upwards from the base table (20) in a freely rotatable condition;
iv) a non workpiece contact guide roller (26) adapted to configure in between the plurality of projections (P2) extending downwards from the base table (20) in a freely rotatable condition;
v) a belt tensioning mechanism (30) comprising a guide screw (302), a guide plate (304), a mounting plate (306), a pair of fingers (308), a tensioning roller (310) and a rotating handle (312), the mounting plate (306) mounted on a vertical column of the base table (20), the guide screw (302) adapted to pass through the mounting plate (306) and the vertical column of the base table (20) is coupled to the guide plate (304) at one end and the rotating handle (312) at other end, the pair of fingers (308) coupled to the guide plate (304) providing a space in between therein, the tensioning roller (310) adapted to configure in between the pair of fingers (308) in a freely rotatable condition;
vi) a drive motor (32) mounted on cross columns at the bottom section (B) of the base table (20);
vii) a belt (28) encompassing shaft of the drive motor (32), the pair of workpiece contact guide rollers (24), the non workpiece contact guide roller (26) and the tensioning roller (310);
viii) a workpiece (46) mounted on the plurality of support rollers (22) in such a way that tubular surface of the workpiece (46) is in contact with the cylinder of bigger diameter of the pair of workpiece contact guide rollers (24);
ix) a grinding machine (40) comprising a motor (402), a grinding wheel (404), a swivel joint (406) and a handle (408), the swivel joint (406) pivoted in between the pair of projections (P4) of the base table (20) in such a way that flat face of the grinding wheel (404) engages with edge of the workpiece (46) at a predetermined angle while chamfering;
x) a pneumatic actuator (38) mounted on the L shaped column (LC) of the basetable (20);
xi) a limiting roller holder (36) configured with a pair of limiting rollers (34) therein in a freely rotatable condition is coupled to piston of the pneumatic actuator (38), the pair of limiting rollers (34) engages with tubular surface of the workpiece (46) at the beginning of chamfering operation; and
xii) a stopper mechanism (42) comprising a cylindrical rod (422), a hollow cylinder (424), a stopper plate (426) and an arresting wheel (428), the hollow cylinder (424) provided with the stopper plate (426) on one side of tubular surface and a threaded hole (H14) on other side of tubular surface adapted to pass through the cylindrical rod (422), the cylindrical rod (422) coupled to the projection (P3) of the base table (20) at one end and the L shaped column (LC) of the base table (20) at other end, the arresting wheel (428) engages with the threaded hole (H14) of the hollow cylinder and arrests the stopper plate (426) at desired position and desired angle adjoining the workpiece (46) over the cylindrical rod (422).

Typically, the workpiece (46) is a solid cylinder or hollow cylinder.

Typically, the plurality of support rollers (22) and the cylinder of bigger diameter of the pair of workpiece contact guide rollers (24) are of same diameter.

Typically, the plurality of support rollers (22), the pair of workpiece contact guide rollers (24), the non workpiece contact guide roller (26), the pair of limiting rollers (34) and the tensioning roller (310) are in freely rotatable condition by means of a plurality of cylindrical pins.

In accordance with the present invention a method of chamfering cylindrical objects on an apparatus is provided, said method comprising the steps of:
i) mounting a workpiece (46) on a plurality of support rollers (22) in such a way that tubular surface of the workpiece (46) mates with a cylinder of bigger diameter of a pair of workpiece contact guide rollers (24);
ii) arresting backward movement of the workpiece (46) by locking a stopper plate (426) at desired position and desired angle adjoining the workpiece (46) over a cylindrical rod (422) of a stopper mechanism (42) through rotation of an arresting wheel (428);
iii) arresting upward movement of the workpiece (46) by engaging a pair of limiting rollers (34) with tubular surface of the workpiece (46) through opening of piston of a pneumatic actuator (38);
iv) supplying power to a drive motor (32) rotates shaft of the drive motor (32) in anti clockwise direction which in turn rotates the pair of workpiece contact guide rollers (24), a tensioning roller (310) in anti clockwise direction and a non workpiece contact guide roller (26) in clockwise direction by means of a belt (28), the rotation of the pair of workpiece contact guide rollers (24) in anti clockwise direction facilitates in rotation of the workpiece (46) in clockwise direction; and
v) supplying power to a grinding machine (40) rotates a grinding wheel (404) in clockwise direction, the grinding wheel (404) flat face engaged with edge of the workpiece (46) at a predetermined angle produces a chamfer at the edge of the workpiece (46) due to friction.

BRIEF DESCRIPTION OF THE DRAWINGS:
The invention will now be described with reference to the accompanying drawings in which:
Figure 1(a) illustrates a perspective view of a pipe according to the prior art;

Figure 1(b) illustrates a perspective view of pipe of figure 1(a) after chamfering according to the prior art;

Figure 2 illustrates a perspective view of conventional apparatus for pipe chamfering according to the prior art;

Figure 3(a) illustrates an isometric view of an apparatus for chamfering of cylindrical objects in accordance with the present invention;

Figure 3(b) illustrates a front view of apparatus for chamfering of cylindrical objects of figure 3(a);

Figure 3(c) illustrates a left side view of apparatus for chamfering of cylindrical objects of figure 3(a);

Figure 3(d) illustrates a top view of apparatus for chamfering of cylindrical objects of figure 3(a);

Figure 4 illustrates an isometric view of base table of figure 3(a);

Figure 5 illustrates an isometric view of a support roller of figure 3(a);

Figure 6 illustrates an isometric view of a workpiece contact guide roller of figure 3(a);

Figure 7 illustrates an isometric view of a non workpiece contact guide roller of figure 3(c);

Figure 8 illustrates an isometric view of a belt tensioning mechanism of figure 3(c);

Figure 9 illustrates an isometric view of a limiting roller of figure 3(c);

Figure 10 illustrates an isometric view of a limiting roller holder of figure 3(c);

Figure 11 illustrates an isometric view of a grinding machine of figure 3(a); and

Figure 12 illustrates an isometric view of a stopper mechanism of figure 3(b).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS:
A preferred embodiment will now be described in detail with reference to accompanying drawings. The preferred embodiment does not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.

Figure 3(a) illustrates an isometric view of an apparatus for chamfering of cylindrical objects.

Figure 3(b) illustrates a front view of apparatus for chamfering of cylindrical objects.

Figure 3(c) illustrates a left side view of apparatus for chamfering of cylindrical objects.

Figure 3(d) illustrates a top view of apparatus for chamfering of cylindrical objects.

In accordance with the present invention, there is provided an apparatus 200 for chamfering of cylindrical objects comprising a base table 20, a plurality of support rollers 22, a pair of workpiece contact guide rollers 24, a non workpiece contact guide roller 26, a belt 28, a belt tensioning mechanism 30, a drive motor 32, a pair of limiting rollers 34, a limiting roller holder 36, a pneumatic actuator 38, a grinding machine 40, a stopper mechanism 42, a control switch 44 and a workpiece 46.

Figure 4 illustrates an isometric view of a base table.
The base table 20 is provided in two sections (i.e. top section T and bottom section B). A plurality of projections P1 defining a space in between therein are provided on cross columns at top section of the base table 20. The plurality of projections P1 are provided with a hole H1 proximal to their top end. A plurality of solid projections P2 extending upwards and downwards are provided on cross columns at top section of the base table 20. The plurality of solid projections P2 extending upwards are provided with a hole H2 proximal to their top end and the plurality of solid projections P2 extending downwards are provided with a hole H2 proximal to their bottom end. A L shaped column LC and a projection P3 are provided on one edge at top section of the base table 20 as shown in the figure 4. A pair of projections P4 facing each other defining a space in between therein are provided on other edge at top section of the base table 20. The pair of projections P4 are provided with a hole H3 proximal to their top end.

Figure 5 illustrates an isometric view of a support roller.
The support roller 22 is a cylindrical roller provided with a hole H4 at its center.

Figure 6 illustrates an isometric view of a workpiece contact guide roller.
The workpiece contact guide roller 24 is a cylindrical rod formed with a cylinder of bigger diameter at its one end and formed with a cylinder of smaller diameter at its mid portion. A hole H5 is provided at the center of the workpiece contact guide roller 24 from one end to other end.

Figure 7 illustrates an isometric view of a non workpiece contact guide roller.
The non workpiece contact guide roller 26 is a cylindrical roller provided with a hole H6 at its center.

Figure 8 illustrates an isometric view of a belt tensioning mechanism.
The belt tensioning mechanism 30 comprises a guide screw 302, a guide plate 304, a mounting plate 306, a pair of fingers 308, a tensioning roller 310 and a rotating handle 312. The mounting plate 306 is provided with a hole H7(not shown in the figure) therein. The guide plate 304 is provided with a hole H8(not shown in the figure) therein. The fingers 308 are attached to the guide plate 304 providing a space in between therein. The fingers 308 are provided with a hole H9 proximal to their one end. The tensioning roller 310 is a cylindrical roller provided with a hole H10(not shown in the figure) at its center.

Figure 9 illustrates an isometric view of a limiting roller.
The limiting roller 34 is a cylindrical roller provided with a hole H11 at its center.

Figure 10 illustrates an isometric view of a limiting roller holder.
The limiting roller holder 36 is of inverted U shape provided with a space in between therein forming fingers. The fingers are provided with a hole H12 proximal to their bottom end.

Figure 11 illustrates an isometric view of a grinding machine.
The grinding machine 40 comprises a motor 402, a grinding wheel 404, a swivel joint 406 and a handle 408. The shaft of the motor 402 is connected to the grinding wheel 404 which facilitates in the rotation of the grinding wheel 404. The swivel joint 406 is provided with a hole H13 proximal to its bottom end. The handle 408 facilitates the operator in engagement and disengagement of the grinding wheel 404 with the workpiece 46.

Figure 12 illustrates an isometric view of a stopper mechanism.
The stopper mechanism 42 comprises a cylindrical rod 422, a hollow cylinder 424, a stopper plate 426 and an arresting wheel 428. The hollow cylinder 424 is provided with the stopper plate 426 on one side of tubular surface and provided with a threaded hole H14 on other side of tubular surface. The cylindrical rod 422 is adapted to pass through the hollow cylinder 424 and the arresting wheel 428 is adapted to engage with the threaded hole H14 of the hollow cylinder 424. The clockwise rotation of the arresting wheel 428 facilitates in arresting the movement and rotation of the hollow cylinder 424 at any desired position and at any desired angle on the cylindrical rod 422. The anti clockwise rotation of the arresting wheel 428 facilitates in free movement and rotation of the hollow cylinder 424 on the cylindrical rod 422.

The configuration and method of working of apparatus 200 for chamfering of cylindrical objects is as follows:
The plurality of support rollers 22 are placed in between the space of the plurality of projections P1 in such a way that the hole H4 of the plurality of support rollers 22 is concentric with the hole H1 of the plurality of projections P1 and locked in position by means of a plurality of cylindrical pins. The plurality of support rollers 22 are in freely rotatable condition over the plurality of cylindrical pins. The pair of workpiece contact guide rollers 24 are placed in between the plurality of solid projections P2 extending upwards in such a way that the hole H5 of the pair of workpiece contact guide rollers 24
is concentric with the hole H2 of the plurality of solid projections P2 and locked in position by means of a plurality of cylindrical pins. The pair of workpiece contact guide rollers 24 are in freely rotatable condition over the plurality of cylindrical pins. The non workpiece contact guide roller 26 is placed in between the plurality of solid projections P2 extending downwards in such a way that the hole H6 of the non workpiece contact guide roller 26 is concentric with the hole H2 of the plurality of solid projections P2 and locked in position by means of a cylindrical pin. The non workpiece contact guide roller 26 is in freely rotatable condition over the cylindrical pin.

The mounting plate 306 of the belt tensioning mechanism 30 is mounted on a vertical column provided between top section T and bottom section B of the base table 20. The guide screw 302 is adapted to pass through the hole H7(not shown in the figure) of the mounting plate 306 and a complementary hole on the vertical column of the base table 20. The guide plate 304 attached with the fingers 308, is coupled to one end of the guide screw 302 via the hole H8(not shown in the figure). The tensioning roller 310 is placed between the fingers 308 in such a way that the hole H10(not shown in the figure) of the tensioning roller 310 is concentric with the hole H9 of the fingers 308 and locked in position by means of a cylindrical pin. The rotating handle 312 is coupled to other end of the guide screw 302 to facilitate in forward and backward movement of the guide screw 302 thereby providing forward and backward movement to the tensioning roller 310.

The drive motor 32 is mounted on cross columns at bottom section B of the base plate 20.
The belt 28 is adapted to encompass shaft of the drive motor 32, the pair of workpiece contact guide rollers 24, the non workpiece contact guide roller 26 and the tensioning roller 310. The backward movement of the tensioning roller 310 adds tension in the belt 28 and helps the belt 28 to be in firm contact with the shaft of the drive motor 32, the pair of workpiece contact guide rollers 24, the non workpiece contact guide roller 26 and the tensioning roller 310. The forward movement of the tensioning roller 310 releases tension in the belt 28. The belt 28 is adapted to mate at portion of cylindrical rod adjacent to cylinder of smaller diameter of the pair of workpiece contact guide rollers 24.

The workpiece 46 is mounted on the plurality of support rollers 22 in such a way that the tubular surface of the workpiece 46 is in contact with the cylinder of bigger diameter of the pair of workpiece contact guide rollers 24.

The pneumatic actuator 38 is mounted on the L shaped column LC of the base table 20. The open end of piston of the pneumatic actuator 38 is coupled to the limiting roller holder 36. The pair of limiting rollers 34 are placed in between the fingers of the limiting roller holder 36 in such a way that the hole H11 of the pair of limiting rollers 34 is concentric with the hole H12 of the fingers of the limiting roller holder and locked in position by means of cylindrical pins. The pair of limiting rollers 34 are in freely rotatable condition over the cylindrical pins. The control switch 44 mounted on the base table 20 controls the movement of the piston of the pneumatic actuator 38.

The swivel joint 406 of the grinding machine 40 is placed in between the pair of projections P4 of the base table 20 in such a way that the hole H13 of the swivel joint 406 is concentric with the hole H3 of the pair of projections P4 and locked in position by means of a cylindrical pin. The grinding machine 40 is pivoted to the base table 20 in such a way that flat face of the grinding wheel 404 engages with the workpiece 46 at an angle.

The cylindrical rod 422 of the stopper mechanism 42 is coupled to the projection P3 of the base table 20 at one end and coupled to the L shaped column LC of the base table 20 at other end.

While chamfering the workpiece 46, there is a possibility of backward movement and upward movement of the workpiece 46. The backward movement of the workpiece 46 is restricted by arresting the stopper plate 426 of the stopper mechanism 42 at desired position and desired angle adjoining the workpiece 46 over the cylindrical rod 422 of the stopper mechanism 42 through clockwise rotation of the arresting wheel 428. The upward movement of the workpiece 46 is restricted by engaging the pair of limiting rollers 34 over the tubular surface of the workpiece 46 through opening of the piston of the pneumatic actuator 38 with the help of the control switch 44.

The supply of power to the drive motor 32 rotates the shaft of the drive motor 32 in anti clockwise direction which in turn facilitates in rotation of the pair of workpiece contact guide rollers 24, the tensioning roller 310 in anti clockwise direction and the non workpiece contact guide roller 26 in clockwise direction by means of the belt 28. The anti clockwise rotation of pair of workpiece contact guide rollers 24 facilitates in clockwise rotation of the workpiece 46. The clockwise rotation of the workpiece 46 results in anti clockwise rotation of the plurality of support rollers 22 and the pair of limiting rollers 34. Now, power is supplied to the grinding machine 40 which results in clockwise rotation of the grinding wheel 404. The operator engages flat face of the grinding wheel 404 with edge of the workpiece 46 at an angle by means of the handle 408. The friction between clockwise rotation of the grinding wheel 404 and clockwise rotation of the workpiece 46 produces a uniform chamfer at edge of the workpiece 46.

TECHNICAL ADVANCEMENTS:
An apparatus for chamfering cylindrical objects has several technical advantages including but not limited to the realization of :
• a simple apparatus for chamfering of cylindrical objects;
• an apparatus for chamfering cylindrical objects of different sizes;
• a fool proof apparatus for chamfering of cylindrical objects;
• an apparatus for chamfering of cylindrical objects that can be even operated by unskilled labour;
• an apparatus that can perform chamfering on cylindrical objects in less cycle time; and
• an apparatus which can perform uniform chamfer on cylindrical objects.

Although the invention has been described herein above with reference to the embodiments of the invention, the invention is not limited to the embodiments described herein above. It is to be understood that modifications and variations of the embodiments can be made without departing from the spirit and scope of the invention.