Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
  • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
  • B26D1/045—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member for thin material, e.g. for sheets, strips or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/06—Arrangements for feeding or delivering work of other than sheet, web, or filamentary form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/08—Means for treating work or cutting member to facilitate cutting
  • B26D7/14—Means for treating work or cutting member to facilitate cutting by tensioning the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
  • B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
  • B65H35/06—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators from or with blade, e.g. shear-blade, cutters or perforators
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/50—Auxiliary process performed during handling process
  • B65H2301/51—Modifying a characteristic of handled material
  • B65H2301/515—Cutting handled material
  • B65H2301/5151—Cutting handled material transversally to feeding direction
  • B65H2301/51512—Cutting handled material transversally to feeding direction using a cutting member moving linearly in a plane parallel to the surface of the web and along a direction crossing the handled material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2404/00—Parts for transporting or guiding the handled material
  • B65H2404/10—Rollers
  • B65H2404/14—Roller pairs
  • B65H2404/143—Roller pairs driving roller and idler roller arrangement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/10—Handled articles or webs
  • B65H2701/17—Nature of material
  • B65H2701/174—Textile; fibres

Definitions

• This invention relates to apparatus for cutting a web of sheet material, and particularly a moving web in a processing line.
• 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
• US patent 3611856 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.
• 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.
• 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.
• the knife 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.
• the knife 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.
• 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.
• Base frame 23 Fourth Lever 4. First Side plate 24. First Holding block
• Second Side plate 35 25. Second Holding block 6.
• First Web guide roller 26 Front plate 6A.
• Second Web guide roller 27 The Rear plate 6B.
• Third Web guide roller 28 The First pulley 7.
• Cross cutter apparatus 29 Second pulley
• Second Tension Roller 37 Second Endless belt assembly 38. Movable knife assembly 15. Web cut piece 39.
• First Guide rail 40 Second Endless belt assembly 38.
• Movable knife assembly Third Guide rail
• Second Pneumatic cylinder 41 Third Guide rail
• Knife 62 Position D 49. Knife holding bracket 63. First Opening
• 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.
• 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).
• 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.
• 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.
• 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).
• the third and fourth pneumatic cylinders (18, 19) are connected to the second tension roller assembly (14) at the ends via a third lever
• 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).
• 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).
• 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).
• third pulley (30) is driven by fourth pulley (35) shown in figure 3 through endless second belt (37).
• 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).
• 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.
• 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.
• 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.
• 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.
• FIG 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.
• 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.
• 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).
• 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.
• 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).
• 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).
• 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.
• 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).
• 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.
• 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).
• 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).

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• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Treatment Of Fiber Materials (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2020
  • 2020-05-18 IN IN202011020787A patent/IN202011020787A/en unknown
• 2021
  • 2021-05-18 EP EP21807799.8A patent/EP4153390A4/de active Pending
  • 2021-05-18 WO PCT/IB2021/054245 patent/WO2021234553A1/en active Application Filing
  • 2021-05-18 CN CN202180041934.8A patent/CN115835942A/zh active Pending
  • 2021-05-18 TW TW110117956A patent/TWI764722B/zh active

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