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Title:
AN APPARATUS AND A METHOD FOR CUTTING A WEB OF WOVEN SHEET MATERIAL
Document Type and Number:
WIPO Patent Application WO/2021/234553
Kind Code:
A1
Abstract:
An apparatus and a method for cutting a moving web (2) of woven sheet material is disclosed. The key components of the apparatus are a pre-draw roller assembly (9) and post-draw roller assembly (11); a cross cutter apparatus (7), mounted at an angle between said roller assemblies (9, 11), and having a moveable knife assembly (38); a system of pneumatic cylinders (16, 17, 18, and 19) that operate a first tension rollers assembly (13) and second tension roller assembly (14) respectively mounted corresponding to said pre-draw assembly (9) and post-draw assembly (11) that help hold down said moving fabric securely and under tension; and a cross cutter apparatus (7) having a movable knife assembly (38) in between of the rollers (9, 11), and a set of pulleys (28, 29) that make possible the movement of the knife assembly on a cutting platform (8), whereby the continuous web (2) is cut into the web cut pieces (15).

Inventors:
LOHIA, Gaurav (Panki Industrial Estate, Kanpur 2, IN)
Application Number:
PCT/IB2021/054245
Publication Date:
November 25, 2021
Filing Date:
May 18, 2021
Export Citation:
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Assignee:
LOHIA CORP LIMITED (Panki Industrial Estate, Kanpur 2, IN)
International Classes:
B26D1/04; B26D7/14
Attorney, Agent or Firm:
TASE, Vijay (Lohia Corp Limited D-3/A, Panki,Industrial Estate, Kanpur 2, IN)
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Claims:
Claims:

1. An apparatus for cutting a web (2) of woven sheet material, characterised in that said apparatus comprises: a first side plate (4) and a second side plate (5) connected to and supported by a base frame structure (3); a cutting platform (8) onto which the continuous moving web (2) from an unwinder is conveyed and passes through a set of web guiding rollers (6, 6A, and 6B) so as to maintain proper tension and , thereby avoiding shrinkage of the web (2); a pre-draw roller assembly (9) and post-draw roller assembly (11), both individually constructed to have a plurality of rollers mounted on a single shaft; a cross cutter apparatus (7) having moveable knife assembly (38), mounted at an inclined angle between said roller assemblies (9, 11), a first tension rollers assembly (13) and second tension roller assembly (14) respectively mounted corresponding to said pre-draw assembly (9) and post-draw assembly (11); a pair of pneumatic cylinders, namely a first pneumatic cylinder (16) and a second pneumatic cylinder (17) connected to said first tension roller assembly (13) using a first lever (20), and a second lever (21), respectively, and another pair of pneumatic cylinders, namely third pneumatic cylinder (18) and a fourth pneumatic cylinder (19) corresponding to said second tension roller assembly (14), connected to said second tension roller assembly (14) using a third lever (22), and a fourth lever (23), respectively, wherein said cross cutter apparatus (7) is capable of cutting said web (2) using said movable knife assembly (38) in between of the rollers (9, 11) on the cutting platform (8), whereby the continuous web (2) is cut into the web cut pieces (15).

2. The apparatus as claimed in claim 1, wherein said connections to said first lever (20) and second lever (21) with said first tension roller assembly

(13), and those of said third lever (23) and said fourth lever (24) with said second tension roller assembly (14) can be of a type selected from bolted, screwed, and bush or bearing arrangement whereby the downwards movement of the corresponding cylinders (16, 17, and 18, 19) facilitates the movement of the first tension roller assembly (13) to press the web (2) against the pre draw roller (9), and that of said second tension roller assembly (14) to press said web (2) against said post-draw roller (11).

3. The apparatus as claimed in claims 1 and 2, wherein the rotational speed of said post-draw roller assembly (11) is slightly higher than the rotational speed of the pre-draw roller assembly (9), wherein the rotational speed of said pre draw roller assembly (9) is controlled by a first motor (10) and the rotational speed of said post draw roller assembly (11) is controlled by a second motor (12).

4. The apparatus as claimed in claims 1 to 3, wherein pre draw roller assembly (9) and post draw roller assembly (11) are identical in construction and have a plurality of rollers, and wherein said first tension roller assembly (13) and second tension roller assembly (14) are of identical construction each made of a plurality of rollers mounted on a set of first and second rod (65, 66) respectively, said first rods (65) connected to each other using a set of brackets (67).

5. The apparatus as claimed in claims 1 to 4, wherein said cross cutter device (7) comprises: two parallel plates, a front plate (26) and a rear plate (27) mounted at a predetermined gap maintained a set of top flat spacers (44) and a set of bottom cylindrical spacers (43), a first pulley (28) mounted at one end of said rear plate (27) is connected to a third pulley (30) via first stationary housing (31) and a first rotating shaft (32), and a second pulley (29) mounted at the other end of said rear plate (27) is connected with an adjustment bracket (33) and a second rotating shaft (34); a first endless belt (36) which passes over said pulleys (28, 29). a moveable knife assembly (38) connected to said endless belt (36) A fourth pulley (35) that drives said third pulley (30) using a second endless belt (37) a third motor (47) mounted on first side plate (4) transferring the rotation to fourth pulley (35), and ultimately to said second pulley (29) via third pulley (30) and first pulley (28) to second pulley (29) which are connected through endless first and second belts (36,

37); a first guide rail (39) and a second guide rail (40) mounted on said front plate (26) at its top and bottom position, respectively, and a third guide rail (41) and fourth guide rail (42) mounted on said rear plate (27), respectively exactly opposite to said first guide rail (39) and second guide rail (40); a front protective cover (45) with swivel that covers a knife (48), a pulley cover (58) to cover said first and second pulleys (28, 29), wherein said cross cutter apparatus is mounted on a first side plate (4) and a second side plate (5) via a first holding block (24) and a second holding block (25) using mechanical means such as bolting, screwing or welding. 6. The apparatus as claimed in claims 1 to 5, wherein said pulleys can be round grooved pulleys having toothed or non-toothed profile that accommodates respective belts (36, 37). 7. The apparatus as claimed in claims 1 to 6, wherein said belts (36, 37) are flexible members have toothed profile that match those of respective pulleys and they are selected from any of the types such as flat belts, V belts, round belts, spring belts, multi groove belts, and timing belts, etc. 8. The apparatus as claimed in claims 1 to 7, wherein said movable knife assembly (38) rotates in the orbit that is circumferential on the path of the first endless belt (36) which runs over the first pulley (28) and second pulley (29).

9. The apparatus as claimed in claims 1 to 8, wherein said guide rails (39, 40, 41, and 42) have u shape cross section or any other cross section such as v shape, curve shape such that the movable knife assembly (38) moves freely through it. 10. The apparatus as claimed in claims 1 to 9, wherein said front protective cover (45) and swivel cover (46) are made of a sheet metal or plate bend to form respective rigid bodies.

11. The apparatus as claimed in claims 1 to 10, wherein said movable knife assembly (38) comprises:

- a knife (48) mounted on knife holding bracket (49) through a knife holding plate (50) to position said knife (48) between said holding bracket (49) and holding plate (50);

- A first guide pin (51) and a second guide pin (52) that are clamped between a first side sheet (53) and a second side sheet (54) to form a rigid body, wherein said first side sheet (53) and second side sheet (54) are mounted on said knife holding bracket (49) that creates the desired gap between both the sheets (53, 54) so that the swivel action of guide pins (51, 52) occurs smoothly;

- a first opening (63) and a second opening (64) through which first endless belt (36) is positioned such that the movement of the movable knife assembly (38) is driven by said first endless belt (36).

12. The apparatus as claimed in claim 11, wherein said first side sheet (53) and second side sheet (54) are constructed in the arc-shaped form so that they can run on the circular periphery of the first pulley (28) and second pulley (29).

13. The apparatus as claimed in claims 5 to 12, wherein the cutting speed of said cross cutter apparatus (7) is set in such a way that time required by said knife (48) to travel from a position A (59) on first longitudinal edge (68) of fabric (2) to a position B (60) on the second longitudinal edge (69) of said fabric (2) is same as the time required by the fabric (2) to travel the distance between the position on said second longitudinal edge (9) that corresponds to said position A to position B (60).

14. A method of cutting a moving web (2) of woven sheet material using the apparatus as claimed in claims 1 to 13, characterised in that said method comprises the following steps: a. passing said web (2) through said web guide rollers (6, 6A, and 6B) to maintain proper tension and removing shrinkage of the web (2); b. pulling said web (2) through the post-draw roller assembly (11), said pre-draw roller assembly (9), and said tension rollers assembly (13, 14) and holding it down on said cutting platform (8) ready for cutting; c. exiting said web (2) from said pre-draw roller assembly (9); d. cutting said moving web (2) using said movable knife assembly (38) having knife (48) held within said cross-cutter apparatus (7) when said moving web (2) comes under said cross cutter apparatus (7) mounted at an inclined angle with respect to the web movement axis (57), while said moving web (2) is still held down securely by said post-draw roller assembly (11) and pre draw roller assembly (9) to provide proper tension and holding; e. transferring the cut piece of said moving web (2) to a downstream station for further processing as desired.

15. The method as claimed in claim 14, wherein the rotational speed of said post-draw roller assembly (11) is slightly higher than the rotational speed of the pre-draw roller assembly (11) and wherein the rotational speed of said pre draw roller (9) is controlled by a first motor (10) and the rotational speed of said post draw roller (11) is controlled by a second motor (12).

16. The method as claimed in claims 14 and 15, wherein the cutting speed of said cross cutter apparatus (7) is set in such a way that time required by said knife (48) to travel from a position A (59) on first longitudinal edge (68) of fabric (2) to a position B (60) on the second longitudinal edge (69) of said fabric (2) is same as the time required by the fabric (2) to travel the distance between the position on said second longitudinal edge (9) that corresponds to said position A to position B (60).

Description:
AN APPARATUS AND A METHOD FOR CUTTING A WEB OF WOVEN SHEET MATERIAL

Field Of Invention

This invention relates to apparatus for cutting a web of sheet material, and particularly a moving web in a processing line.

Background Of Invention

There are many processing lines and conversion lines wherein the web cutting systems are already in usage. The conventional knife arrangements of prior art patent have proved to be highly successful in the handling of sheet materials of the types listed therein, namely cardboard, plastics and like materials which are relatively thick or otherwise resistant to conventional cutting knives. However, these systems have not been satisfactory for use with webs of materials which have a high tendency to elongate under stress and/or a low coefficient of friction such for example as woven and nonwoven plastic fibre or filament webs.

The problem which arises in the cutting of such webs derives from the basic fact that with any knife which relies for the cutting action on its passage through an inadequately supported web, as distinguished from a guillotine type knife which cuts directly against an anvil, the tension in the web is an essential factor in the cutting action. In other words, the tension in that portion of the web which opposes the knife must be adequate to keep the web sufficiently taut for passage of the knife therethrough, rather than merely stretching the web without the knife penetrating it. This problem is especially acute in connection with webs which have such a high tendency to elongation under stress that they must be handled in a processing line and rewound under very low tension to prevent permanent elongation in the wound roll. A typical example of such a web is a woven plastic of such high tendency to stretching. If it is attempted to cut such a web with the knife arrangement of, for example, U.S. Pat. No.3, 794, 255, the required elongation will occur between the knife and the winding roll causing excessive knife travel. In addition, some web materials, depending upon their coefficient of friction, will skid against the driving drum before enough tension can be developed to cut the web

Also as an example, US patent 3611856 (‘856) discloses web cutter for cutting a web of material into web portions of a predetermined size. The ‘856 invention further discloses a cutter system which is placed perpendicular to the direction of the web. Such ‘856 invention does not disclose about the cross cutting method or technique of web cutting. Since the cross cutting method is advantageous during high speed cutting, so the ‘856 invention lacks the precise cutting of web with high speed moving web.

Thus, there is a need for a more efficient cutting system for continuously moving web, particularly woven plastic fabric moving at higher speed and which overcomes the aforementioned drawbacks of the conventional systems.

Objects of Invention:

The main objective of the present invention is to provide a cutting apparatus or device or system to facilitate accurate cutting of a continuously moving web made of woven plastic.

A further objective of the present invention is to provide a cutting device or system which allows rapid cutting of a continuously moving web made of woven plastic with low maintenance cost.

Another objective of the present invention is to provide a cutting device or system which provides flexibility in handling of different specification webs without much alteration in the device or system. Summary Of Invention:

The web or fabric cutting apparatus of the present invention comprises a transport table for the workpiece movement and a movable knife, the knife being preferably guided along an orbit. The web cutting apparatus disclosed herein enables highest throughput rates of workpieces and whereby the web cutting apparatus is advantageously used for the separation of workpieces from a woven plastic web. When the knife is in an orbit, it can be guided at a uniform speed, reducing power consumption for the gear motor or the drive, increasing life and reducing maintenance.

The knife, in the form of a blade, is mounted on a conveyance means, such as a belt. The conveyance means rotates in a direction that is nearly transverse to the direction of movement of the unrolling web or fabric.

The roll carrying a fabric that needs cutting into pieces is unwound from an unwinding unit. The fabric may be made of stretched plastic tape, which is optionally coated, or of plastic film, or of composite materials of fabric and plastic films.

The unwound fabric travels on a transportation means or a conveyance means onto a cutting platform. The conveyance means may be operated using driven rollers, for example. Adjacent to the worktable is provided a transverse transport device which is in the form of a conveyor belt (not shown), and clamping means for workpieces, such as grippers or magnets.

The separation of a leading workpiece from the continuously arriving unrolled fabric takes place by means of the apparatus disclosed herein which essentially is a cutting device which comprises at least one movable knife, wherein the knife is guided along an orbit, which in the circumferential direction, substantially transversely to the longitudinal transport direction aligned endless belt to which at least one blade is fixed. The endless belt runs around two rollers, at least one of the two rollers is driven by a motor with speed controller, preferable a servo motor. The knife severed the incoming workpiece across the width by travelling at controlled speed based on incoming workpiece traverse rate.

The cut made using the device disclosed herein is of high quality, i.e. a smooth and precise cut is produced.

The transverse transport device conveys individual workpieces, away from the work area in a transverse transport direction which is oriented orthogonally to the longitudinal transport direction.

In a subsequent process step, once the knife has already completely cut off the single workpiece from the contiguous workpieces, it moves along its orbit to the top of the endless belt and thus out of contact with the workpieces. The individual workpiece is conveyed away from the working area by means of the transverse transport device in the transverse transport direction.

Brief Description Of Figures in the drawings:

Figure 1 shows the perspective view of general arrangement of the web cutting apparatus of the invention.

Figure 1 A shows the moving web gripped by pre draw roller assembly, post draw roller assembly, first tension roller assembly and second tension roller assembly. Figure 2 shows the section view of cross cutting device which moves the blade in the orbit that is in the traverse direction to that of the moving web.

Figure 2A shows cross sectional view of the cross cutter apparatus.

Figure 3 shows perspective view of the cross cutter apparatus with protective covers and maintenance facility.

Figure 4 shows perspective view of the movable knife assembly. Figure 4A shows perspective view of the connection of movable knife assembly with the cross cutter apparatus.

Figure 5 shows the top view of the cross-cutter apparatus.

Figure 5A shows the schematic view of cross cutting operation.

List of Parts:

1. Web cutting apparatus 21. Second Lever

2. Web 22. Third Lever

3. Base frame 23. Fourth Lever 4. First Side plate 24. First Holding block

5. Second Side plate 35 25. Second Holding block 6. First Web guide roller 26. Front plate 6A. Second Web guide roller 27. Rear plate 6B. Third Web guide roller 28. First pulley 7. Cross cutter apparatus 29. Second pulley

8. Cutting platform 40 30. Third pulley

9. Pre-draw roller assembly 31. Housing

10. First motor 32. First Shaft

11. Post-draw roller assembly 33. Adjusting plate 12. Second motor 34. Second Shaft

13. First Tension Roller 45 35. Fourth pulley assembly 36. First Endless belt

14. Second Tension Roller 37. Second Endless belt assembly 38. Movable knife assembly 15. Web cut piece 39. First Guide rail

16. First Pneumatic cylinder 50 40. Second Guide rail

17. Second Pneumatic cylinder 41. Third Guide rail

18. Third Pneumatic cylinder 42. Fourth Guide rail

19. Fourth Pneumatic cylinder 43. Bottom cylindrical spacer 20. First Lever 44. Top flat spacer 45. Front protection cover 15 59. Position A

46. Swivel cover 60. Position B

47. Third motor 61. Position C

48. Knife 62. Position D 49. Knife holding bracket 63. First Opening

50. Knife holding plate 20 64. Second opening

51. First Guide pin 65. First rod

52. Second Guide pin 66. Second rod

53. First Side sheet 67. Clamp 54. Second Side sheet 68. first longitudinal edge of

55. Belt attachment 25 fabric

56. Knife movement axis 69. Second longitudinal edge of

57. Web movement axis fabric

58. Pulley cover

Detail Description Of Invention with reference to drawings: Figure 1 shows the apparatus of the present invention which is a web or fabric cutting apparatus (1) which facilitates accurate cutting of a continuously moving web (2) made of woven fabric such as plastic. The apparatus (1) comprises of a first side plate (4) and a second side plate (5) which are connected to and supported by a base frame structure (3) and cross cutting apparatus (7) with moving knife assembly (38). The base frame structure (3) is constructed of a plurality of the rectangular cross-sectional members which are jointed or welded together to form a sturdy base.

In one of the embodiments, the side plates (4, 5) are constructed in the form of a thick plates and are attached to the base frame structure (3) by any kind of joining means such as welding, bolting or screwing to form a rigid member. The apparatus (1) further comprises a cutting platform (8) onto which the continuous moving web (2) from the unwinder (not shown) is conveyed in the direction shown by dotted arrow in Figure 1 by a pull-off driven roller (not shown) and passes through a set of web guiding rollers (6, 6A, and 6B) to maintain proper tension and avoiding shrinkage of the web (2).

The apparatus (1) also comprises of a pre-draw roller assembly (9) and post-draw roller assembly (11). Using a cross cutter apparatus (7), the cutting of the moving web (2) takes place in between of the rollers (9, 11) on the cutting platform (8), whereby the continuous web (2) is converted into the web cut pieces (15). The pre draw roller assembly (9) and post draw roller assembly (11) are individually constructed in such a way that they both have a plurality of rollers mounted on a single shaft.

As shown in figure 1 A, the apparatus (1) further comprises of first tension rollers assembly (13) and second tension roller assembly (14) which are used for the holding of the web (2) and also presses the web (2) from above onto the pre-draw roller assembly (9) and post-draw roller assembly (11) all over the traverse web length with the help of pneumatic cylinders such that web (2) lies between the roller assemblies (9, 11, 13, and 14) . The first pneumatic cylinder (16) and second pneumatic cylinder (17) works together in the downwards direction and pushes the first tension roller assembly (13) at both ends. The first and second pneumatic cylinders (16, 17) are connected to the tension roller assembly (13) via a first lever (20) and second lever (21) respectively. The said connection can be obtained by any mechanical method of bolting, screwing or using bush or bearing arrangement such that the downwards movement of the cylinders (16,17) facilitates the movement of the first tension roller assembly (13) to press the web (2) against the pre draw roller (9). Further, the first tension roller assembly (13) and second tension roller assembly (14) are responsible for maintaining adequate tension in and holding of the web (2) during cutting so that clean and accurate cutting takes place. This web tension is created by the difference in speed between the pre-draw roller assembly (9) and post -draw roller assembly (11). The post-draw roller assembly (11) speed measured in rpm is slightly higher than the speed of pre-draw roller assembly (9), the rpm of pre draw roller assembly (9) is controlled by the first motor (10) and the rpm of post draw roller assembly (11) is controlled by second motor (12).

Such difference in the rpm is also required to pull the web (2) in the direction of web movement axis (57).

In the same way, a third pneumatic cylinder (18) and fourth pneumatic cylinder

(19) work together in the downward direction and push the second tension roller assembly (14) at both ends. The third and fourth pneumatic cylinders (18, 19) are connected to the second tension roller assembly (14) at the ends via a third lever

(20) and fourth lever (23) respectively. The said connection can be obtained by any mechanical method of bolting, screwing or using bush or bearing arrangement such that the downward movement of the cylinders (18,19) facilitates the movement of the second tension roller assembly (14) to press the web (2) against the post draw roller (11).

It is evident from the Figure 1 A that, pre draw roller assembly (9) and post draw roller assembly (11) are identical in construction with plurality of rollers. These rollers can be chosen from the set of rolling members such that while drawing the web (2) in the direction of web movement axis (57) the rollers provide negligible friction to the surface of web (2) due to which the web (2) does not get damaged. The first tension roller assembly (13) and second tension roller assembly (14) also comprises of plurality of rollers mounted on a first and second rod (65, 66) respectively thereby connecting the rod (65, 66) individually with the at least two brackets (67). Figure 2 shows the internal construction of the cross cutter apparatus (7), comprising of a moving cutting assembly (38) mounted on endless belt (36), two parallel plates, a front plate (26) and a rear plate (27) which are mounted at a prescribed gap as shown in figure 2A that is maintained by a set of top flat spacer (44) and a set of bottom cylindrical spacers (43). The front and rear plates (26, 27) can be constructed from a metallic or non-metallic plate which can bear the load of the other supporting members. Cross cutter apparatus (7) is located on the cutting platform (8) at an inclined angle a as shown in figure 5 perpendicular in direction with respect to the web movement direction (56) and cross cutter apparatus (7) mounted on the first side plate (4) and second side plate (5) via first holding block (24) and second holding block (25). The said mounting can be achieved by any mechanical means such as bolting, screwing or welding.

The cross cutter apparatus further comprises of a rear plate (27) wherein at the ends of the said rear plate (27), a first pulley (28) and at the other end a second pulley (29) are mounted. The said first pulley (28) is connected to third pulley (30) via first stationary housing (31) and a first rotating shaft (32) and on the other end second pulley (29) mounted on the rear plate (27) is connected with the adjustment bracket (33) as shown in figure 5 and second rotating shaft (34).

By moving the adjustment bracket (33) as shown in figure 5, the second pulley (29) can be moved farther from the first pulley (28). Such movement is required to increase or decrease the tension in the first endless belt (36) which passes over the pulleys (28,29).

Further, the third pulley (30) is driven by fourth pulley (35) shown in figure 3 through endless second belt (37). Hence, the rotation is transmitting from third motor (47) as shown in Figure 3 which is mounted on first side plate (4) to fourth pulley (35) and from fourth pulley (35) to third pulley (30) which are connected through endless second belt (37) and then from third pulley (30) which are directly coupled to first pulley (28) and finally from first pulley (28) to second pulley (29) which are connected through endless first belt (36).

In one of the embodiments, the pulleys can be selected from the set of round grooved members having toothed or non-toothed profile, such that profile can be of any shape or size which can drive the belts along with it. Also, these pulleys are efficient enough to transmit the motor power and drive the belts smoothly.

In another embodiment, the belts can be selected from set of flexible members having toothed profile same as of pulleys and can withstand the wear and tear.

The belts can be of any type such as flat belts, V belts, round belts, spring belts, multi groove belts, timing belts, speciality belts or of any kind known to person skilled in art.

Movable knife assembly (38) mounted on the first endless belt (36) which makes movable knife assembly (38) rotates in the orbit that is circumferential on the path of the first endless belt (36) which runs over the first pulley (28) and second pulley (29) to cut the web fabric in to workpiece smoothly.

As can be seen from Figure 4A, the said movable knife assembly (38) is further supported and guided by the guide rails in between first pulley (28) and second pulley (29) on top and bottom positions. The said guide rails are mounted on the front plate (26) and rear plate (27) in such a manner that opposite guide rails face each other. The first Guide rail (39) and the second guide rail (40) are mounted on the front plate (26) at top and bottom position where as the third guide rail (41) and fourth guide rail (42) are mounted on the rear plate (27) exactly opposite to the first guide rail (39) and second guide rail (40) as shown in Figure 2A. In one of the embodiments, these guide rails (39, 40, 41, and 42) may be made of any shape such as u shape cross section or any other cross section such as v shape, curve shape such that the movable knife assembly moves freely through it.

Figure 3 shows perspective view of the cross cutter apparatus (7) comprises of front protective cover (45) and a swivel cover (46). Front protection cover (45) covers the knife (48) moving path to avoid any accident and pulley cover (58) is also provided to cover the rotating part to avoid any accident. At the top of the cross cutter apparatus (7) one swivel cover (46) is provided for the changing of the knife (48) when the knife (48) is worn-out so that there is no need to open the whole cross cutter apparatus (7) for changing the worn out knife which has to be done periodically. Further, the cross cutter apparatus (7) is driven by the third motor (47) which is coupled with the fourth pulley (35) and is connected to the third pulley (30) via endless belt (37).

In one of the embodiments, the front protective cover (45) may be constructed of a sheet metal or plate bend to form a rigid body which can withstand the external impact if occur during the cutting process.

In another embodiment, the swivel cover (46) can also be constructed of a sheet metal or plate bend to form a rigid surface. Also, the swivel cover (46) can be opened and closed whenever the blade (48) of the movable knife assembly (38) requires to be changed when it is worn out. Such change can take place by driving the movable knife assembly (38) to position D (62) and thereby opening the swivel cover (46). The position D (62) can be determined by set of sensors (not shown) which governed the stoppage of the movable knife assembly (38).

Figure 4 shows the movable knife assembly (38) which comprises of knife holding bracket (49) on which the knife (48) is located and mounted through the knife holding plate (50) such that knife (48) lies between the holding bracket (49) and holding plate (50). The knife (48) can be selected from set of any sharp object which is capable of cutting the web (2) perfectly and smoothly without any hindrance.

The movable knife assembly (38) further comprises of first guide pin (51) and a second guide pin (52) that are clamped between the first side sheet (53) and second side sheet (54) in such a way that it forms a rigid body. First side sheet (53) and second side sheet (54) are mounted on the knife holding bracket (49) that creates the prescribed gap (not shown) between both the sheets so that the swivel action of guide pins can take place smoothly. First side sheet (53) and second side sheet (54) are constructed in arc-shaped form so that they are able to run on the circular periphery of the first pulley (28) and second pulley (29).

Further, the said movable knife assembly (38) also comprises of first opening (63) and second opening (64) for positioning of first endless belt (36) through which, the movement of the movable knife assembly (38) is driven .

Figure 4A, shows perspective view of movable knife assembly (38) wherein guide pin (52) moves along the profile of the fourth guide rail (42) and second guide rail (40). As mentioned earlier, the movable knife assembly (38) is connected to the first endless belt (36) such that the said movable knife assembly (38) is driven by the first endless belt (36) along the path as defined by the first endless belt (36).

Figures 5 and 5A show the top view of cross cutter apparatus (7) and schematic view of the cutting operation. As shown in the Figures 5 and 5 A cross cutter apparatus (7) is mounted at an inclined angle a perpendicular in direction with respect to the web (2) movement direction axis (57). Cutting speed of cross cutter is set in such a way so that time required by the knife (48) to travel from position A (59) to position B (60) is same as the time required taken by the fabric to move from position C (61) to position B (60). Inclined mounting of cross cutter apparatus (7) provides the flexibility to the system to set the driving speed of the cutter knife (48) with respect to the continuous moving web (2).

The present invention also provides a method of cutting a moving web (2).. The said method uses the apparatus (1) for cutting a moving web (2) disclosed on the foregoing pages. The method of the cross-cutting of the moving web (2) according to the present invention comprises of following steps:

• Web (2) is pulled by the pull-off roller from the unwinder roll.

• Web (2) passes through the web guide rollers (6,6A,6B) to maintain proper tension and removing shrinkage of the web (2).

• Web (2) is further pulled through the post-draw roller assembly (11) and pre-draw roller assembly (9) where tension rollers assembly (13,14) provides proper holding during cutting of the web (2).

• Web (2) exit from the pre-draw roller assembly (9) and when it comes under the cross cutter apparatus (7) mounted at an inclined angle with respect to the web movement axis (57), movable knife assembly (38) which is mounted on the first endless belt (36) between the two pulleys (28,29) cuts the web (2) simultaneously the post-draw roller assembly (11) and pre draw roller assembly (9) holds the web (2) during cutting to provide proper tension and holding.

Movable knife assembly (38) moves and guided by the first endless belt (36) and the guiding rails (39, 40, 41, and 42) so that it can move in the required orbit.

• Required web cut piece is transferred for further processing as desired. The method disclosed herein has further embodiments described as follows.

In one of the embodiments, the rotational speed of said post-draw roller assembly (11) is slightly higher than the rotational speed of the pre-draw roller assembly (11) and wherein the rotational speed of said pre draw roller (9) is controlled by a first motor (10) and the rotational speed of said post draw roller (11) is controlled by a second motor (12).

In another embodiment, the cutting speed of said cross cutter (7) is set in such a way that time required by said knife (48) to travel from a position A (59) on first longitudinal edge (68) of fabric (2) to a position B (60) on the second longitudinal edge (69) of said fabric (2) is same as the time required by the fabric (2) to travel the distance between the position on said second longitudinal edge (9) that corresponds to said position A to position B (60). While the above description contains much specificity, these should not be construed as limitation in the scope of the invention, but rather as an exemplification of the preferred embodiments thereof. It must be realized that modifications and variations are possible based on the disclosure given above without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be determined not by the embodiments illustrated, but by the invention as a whole and in addition to appended claims and their legal equivalents.