Method for bagging material

Abstract

The present invention provides an apparatus for bagging material into a film. The film has at least two overlapping sheets and at least one open edge. The apparatus a pair of spaced apart carriages and a pair of clamp assemblies movably mounted to a respective carriage. The clamp assemblies are pivotally movable relative to the respective carriage and vertically moveable along the length of the respective carriage. The clamp assemblies engage the film and open the film by separating the overlapping sheets. The clamp assemblies are moved downwardly along the length of the respective carriages so as to provide for the opened film to progressively bag material positioned thereunder. The clamp assembly includes a clamp having a pair of clamping members which are configured to grip a portion of the overlapping sheets for separation thereof. A method for bagging material into a film is also disclosed.

Description

FIELD OF THE INVENTION

The present invention relates to bagging material. More specifically, the present invention is concerned with an apparatus and method for bagging material.

BACKGROUND OF THE INVENTION

It is known in the art to bag, package, cover or wrap certain products, such as bundles of lumber, in order to protect them from the external environment, such as UV radiation, and preserve an appropriate degree of humidity. Apparatuses for loading forestry, agriculture or other products into stretchable plastic tubes or films have been provided. Traditional systems can be labor intensive at the mill site, and can also result in the ingress of moisture through rips and perforations. Therefore some later improvements in bagging such goods provided apparatuses having a support board with a stretch film and moveable fingers in horizontal and vertical directions for picking up this film and covering the stack or bundle of products.

U.S. Pat. No. 6,032,439 issued to Birkenfeld et al, on Mar. 7, 2000 teaches an apparatus for covering articles on a support palet with a stretch film. The apparatus includes at least four reefing fingers that are movable in the horizontal and vertical directions for picking up the film in four corners and covering the rectangular bundle.

U.S. Pat. No. 6,662,535 issued to Pin on Dec. 16, 2003 teaches an apparatus for bagging material into a stretchable bag having an open end. This apparatus includes a movable bag stretching structure movable between a first position for receiving the bag and a second position for holding the bag in a stretched state. The apparatus further includes bag gripping members for turning the bag inside out over the movable bag stretching structure. The movable bag stretching structure is displaced towards a facing side of the material while being held in a stretched state. This continuous displacement causes the bag to be inverted onto the material for covering thereof.

U.S. Pat. No. 6,978,587 issued to Drolet on Dec. 27, 2005 provides an apparatus and a method for the automated wrapping of a bundle with a resilient stretchable film. This patent teaches an apparatus and method which provides for unrolling a desired length of film and cutting this desired length. The film includes two overlapping panels. The edges of the open side are grasped and opened and the opened tube is loaded onto an expandable frame. At least a portion of the tube is accumulated on this expandable frame in a folded condition. The expandable frame then stretched the tube and the bundle of material is then covered by this tube made of film.

The cited references above are incorporated herein by reference.

A drawback of the above systems is that they are relatively expensive and require a lot of space to be installed. A drawback of the known systems is that they are inconvenient.

OBJECTS OF THE INVENTION

An object of the present invention is to provide an apparatus for bagging material.

An object of the present invention is to provide a method for bagging material.

SUMMARY OF THE INVENTION

In accordance with an aspect of the present invention, there is provided an apparatus for bagging material into a film, the film having at least two overlapping sheets and at least one open edge, the apparatus comprising: a pair of spaced apart carriages; and a pair of clamp assemblies, each clamp assembly being movably mounted to a respective carriage so as to be pivotally movable relative to the respective carriage and vertically moveable along the length of the respective carriage, wherein the clamp assemblies engage the film and are configured to open the film by separating the overlapping sheets, the clamp assemblies being downwardly movable along the length of the respective carriages so as to provide for the opened film to progressively bag material positioned thereunder.

In accordance with another aspect of the present invention, there is provided an apparatus for bagging material into a film, the film having at least two overlapping sheets and at least one open edge, the apparatus comprising: a pair of spaced apart carriages; and a pair of clamp assemblies, each clamp assembly being mounted to a respective carriage and comprising a respective clamp, each clamp comprising a respective pair of clamping members being reciprocally movable from a clamping position for engaging the film to an unclamping position, each clamping member comprising respective gripping elements for gripping a sheet of the film, wherein when the clamping members engage the film from the external surface thereof, each clamping member of a given clamp engages a respective overlapping sheet, the gripping elements of each said clamping member grip a portion of a respective sheet, the clamping elements of each given clamp are moved in the unclamping position thereby separating the sheets from one another.

In accordance with a further aspect of the present invention, there is provided a method for bagging material into a stretchable film, the method comprising: providing a desired length of stretchable film, the film having at least two overlapping sheets and at least one open edge; stretching the desired length of film by clamping the film on the outer surface thereof at two opposite areas, each area being near a respective longitudinal length of the film and moving the two clamped areas away from one another; separating the two overlapping sheets by gripping an outer portion of each sheet and moving these gripped outer portions away from one another thereby opening the film; and covering the material by progressively moving the film onto the material while maintaining the gripped outer portions.

It should be noted that the terms “bagging”, “covering”, “wrapping” and like terms with reference to a film on material or bundle of material are interchangeable and replaceable by like terms within the context of the present invention.

Other objects, advantages and features of the present invention will become more apparent upon reading of the following non-restrictive description of illustrative embodiments thereof, given by way of example only with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the appended drawings, where like reference numerals denote like elements throughout, and where:

FIGS. 1-9 are top perspective sequential views of the apparatus for bagging material in accordance with an illustrative embodiment of the present invention;

FIG. 10 is a perspective view of a clamp in an open position mounted to an mobile arm in the horizontal position, which is mounted to an elevator support, which in turn is mounted to a carriage in accordance with an illustrative embodiment of the present invention;

FIG. 11 is a perspective view of a clamp in an closed position mounted to an mobile arm in the horizontal position, which is mounted to an elevator support, which in turn is mounted to a carriage in accordance with an illustrative embodiment of the present invention;

FIG. 12 is a perspective view of a clamp in an closed position mounted to an mobile arm in the vertical position, which is mounted to an elevator support, which in turn is mounted to a carriage in accordance with an illustrative embodiment of the present invention;

FIG. 13 is a perspective view of the mobile arm of in accordance with the an illustrative embodiment of the present invention;

FIG. 14 is an exploded perspective view of the mobile arm of FIG. 13;

FIG. 15 is a perspective front partially exploded view of a carriage in accordance with the an illustrative embodiment of the present invention;

FIG. 16 is a perspective rear partially exploded view of the carriage of FIG. 15;

FIG. 17 is a perspective front exploded view of the elevator support in accordance with the an illustrative embodiment of the present invention;

FIGS. 18A-18E are sequential partial front views of the clamping members acting on a film in accordance with the an illustrative embodiment of the present invention;

FIGS. 19A-19E are sequential partial front views of the clamping members acting on a film in accordance with the another illustrative embodiment of the present invention;

FIG. 20 is a perspective view of a bundle of material bagged, covered or wrapped with a film in accordance with an illustrative embodiment the present invention; and

FIG. 21 is a perspective view of a bundle of material bagged, covered or wrapped with a film in accordance with another illustrative embodiment the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Generally, stated the invention provides an apparatus for bagging material into a stretchable film that comprises a pair of moveable carriages including respective clamps. Each clamp is movably mounted to a respective carriage so as to be elevated or descended along the vertical length of the carriage, transversely moved in the left and right direction relative to the carriage and rotated from a generally horizontal position to a generally vertical position. The carriages are transversely movable relative to one another so as to bring the clamps closer together or move them further apart. A bagging film is positioned adjacent to the carriages, the distance between the carriages will depend on the length of the film that is to be used to bag material. The film is folded thereby defining two overlapping sheets with the closed edge facing the carriages and the opposite edge being open. The clamps, of each carriage, respectively clamp an opposite longitudinal end of the film from the external side of the film and move the film above the material that is to be bagged. The carriages move away from each other causing the clamps to stretch the film and then the carriages may be brought closer to one another after the film has been sufficiently stretched. Each clamp comprises a pair of clamping members, each clamping member engages a sheet. The clamping members move away from one another thereby pulling each respectively engaged sheet away from the other thus opening the film. Maintaining the foregoing position, the clamping members then descend the open film onto the material, with the open side facing the material, causing the film to progressively cover this material during descent. When the material is covered, the clamping members disengage the sheets.

With reference to the associated drawings embodiments of the present invention will now be described.

In order to facilitate the present description, direction arrows in the Y, X and Z axis are represented in the drawings so as assist in describing the movement of the various parts of the present invention.

Sequential FIGS. 1-9 show an apparatus 10 for bagging material in a bundle such as a load 12 of lumber (not shown) for example.

The apparatus 10 is an assembly of sub-apparatuses including a first load transfer 14 for conveying the load 12 in the −Y and +Y directions, a second load transfer 15 for conveying the load 12 in the +X and −X directions, a film dispensing and cutting assembly 16, a film conveying device 18 for conveying film in the −Y and +Y directions, and a film stretching and bagging device 20. The first and second load transfers 14 and 15 may be in-feed or out-feed transfers and are known in the art and need not be described or illustrated in further detail.

The stretching and bagging device 20 includes a pair of left and right moveable columns or carriages 22a and 22b movably mounted on rails 21 formed on a base frame 23 and being adjacent to the load transfers 14 and 15. Carriages 22a and 22b are transversely movable on a rail 21 in the −Y and +Y directions.

Each left and right moveable carriages 22a and 22b includes a respective elevator support 24a and 24b movably mounted thereto. The elevator supports 24a and 24b are respectively moveable along the carriages 22a and 22b in the −Z and +Z directions.

Each elevator support 24a and 24b supports a respective mobile arm 26a and 26b moveably mounted thereon. The mobile arms 26a and 26b are respectively moveable along supports 24a and 24b in the −X and +X directions and also respectively rotatable on supports 24a and 24b as shown by arrow R in FIGS. 11 and 12 from a generally horizontal position to a generally vertical position respectively and vice versa.

Each mobile arm 26a and 26b includes a respective clamp 28a and 28b. With reference to FIGS. 1, 2, 9, and 10-12, each clamp 28a and 28b includes respective pair of clamping members 28aI, 28aII and 28bI, 28bII. Clamping members 28aI and 28aII are oppositely moveable in relation to one another along the support 24a in the +X and −X directions. Clamping members 28bI and 28bII are oppositely moveable in relation to one another along the support 24b in the +X and −X directions. Thereby, the clamps 28a and 28b are moveable from an unclamping (open) position shown in FIG. 10 to a clamping (closed) position shown in FIG. 11.

With reference to FIG. 1, the film dispensing and cutting assembly 16 includes a film dispenser 30, for carrying a film 32 in a roll, as well as a sealing and cutting unit 34 which may include a film holder 36 for receiving the film 32 from dispenser 30, cutting a predetermined amount film 32 and then sealing this film in a desired arrangement as is known in the art.

The film conveying device 18 includes a leading lateral clamp 38 and a floating clamp 40 moveably mounted to a rail 42 along the lateral frame 44 and actuated by motor 46 so as to move in the −Y and +Y directions. As better shown in FIGS. 6, 7 and 8, the lateral clamp 38 includes gripping members 39 for gripping a free end of the film 32. As better shown in FIGS. 6, 7 and 8, the floating clamp 40 includes clamping members 41a and 41b moveably mounted on base member 43 so as to move in the +Z and −Z directions. The base member 43 is in turn movably mounted on the rail 42.

With particular reference to FIGS. 1, 3, 13 and 14 each carriage 22a and 22b includes bearings 48 on its underside 49 that are slidably mounted along the rails 21. With reference to FIGS. 1-9, the carriages 22a and 22b are movable along rails 21 by way of a displacement belt 50 mounted to a rotating actuator 52 and powered by a motor and gearbox assembly 54, the belt 50 is mounted to a pulley 53 at the opposite end of the base frame 23 in relation to actuator 52. The carriages 22a and 22b are mounted to the belt 50 via a fastening assembly 56 (see FIGS. 15 and 15). The longitudinal ends of the base frame 23 include bumpers 58 for stopping the transversal movement of the carriages 22a and 22b.

With reference to FIGS. 11, 12, 15 and 16, the front faces of the carriages 22a and 22b include vertical rails 60 (only carriage 22a is shown but it should be understood that carriages 22a and 22b are substantially identical).

With reference to FIGS. 15 and 16, the rails 60 which provide the elevator supports 24a and 24b to move thereon in the −Z and +Z directions by way of an actuator assembly 61 mounted within each carriage 22a and 22b. The actuator assembly 61 includes a conveyor belt 62 fixedly mounted at one end to the inner rear top end 63 of a carriage 22a and 22b via a fastening assembly 64. The belt 62 engages a first pulley 65 roatably mounted within a moveable housing 66 and a second pulley 67 roatably mounted near the inner front top end 68 of a carriage 22a and 22b. In this way, the belt 62 defines three zones, a first zone 62i between the fastening assembly 64 and pulley 65, a second zone 62ii between pulley 65 and pulley 67 and third zone 62iii between pulley 67 and an elevator support 24a and 24b.

Turning to FIG. 15, an elevator support 24a (the following applies to actuator 24b as well) is mounted to the belt zone 62iii of a carriage 22a (or 22b) via a fastening assembly 68. The elevator supports 24a and 24b include four linear bearings 69 which slidably engage the vertical rails 60

Returning to FIG. 16, an actuator 70 in the form of a pneumatic cylinder is mounted within the carriages 22a and 22b and is connected to the pulley housing 66 via a reciprocating rod (not shown). With reference to FIGS. 11, 12 and 15, the bottom end of the front face of each carriage 22a and 22b includes a pair of stoppers 71 for stopping the elevator supports 24a and 24b during their descent. A gore-track 72 is provided for wiring.

Therefore, when the cylinder 70 moves the pulley housing 66 downwardly in the −Z direction, belt zone 62iii is pulled back raising the elevator support 24a or 24b in the +Z direction. When the cylinder 70 moves the housing 66 upwardly in the +Z direction, the belt 62 is provided with slack allowing belt zone 62iii to move forward thereby descending the elevator support 24a or 24b in the −Z direction.

Now turning to FIGS. 13 and 14, each mobile arm 26a and 26b (only 26a is shown but arms 26a and 26b are substantially identical) includes a housing 73 a respective top rail 74 (see FIGS. 10 and 11) and a respective bottom rail 75 mounted on the front face of the housing 73 for movably mounting a respective pair of clamping members 28aI, 28aII and 28bI, 28bII via linear bearings 76 thereto (see FIGS. 10 and 11). The mobile arms 26a and 26b include a respective pneumatic actuator 77 mounted on the housing 73 for actuating a pulley assembly 78 mounted within the housing 73 and comprising a pair of gear belts 80 and 82. The gear belts 80 and 82 are mounted to respective lateral end pulley members 84 and 86 and a respective central pulley member 88. Each lateral end pulley member 84 and 86 receives a respective shaft assembly 90 and 92. Lateral end pulley members 84 and 86 are configured to respectively rotate about shaft assemblies 90 and 92. The central pulley members 88 are collinearly and rotatively mounted about a common shaft 94. The gear belts 80 and 82 are configured to rotate about the pulley members 84, 86 and 88 thus defining front and rear belt zones 96 and 98 respectively. Gore-tracks 100 and 102 provide for guiding any wiring during rotational movement of the gear belts 80 and 82.

A clamping member 28aI or 28bI is mounted to the pulley assembly 78 of a respective arm 26a and 26b via a link 104. A clamping member 28aII or 28bII is mounted to the pulley assembly 78 of a respective arm 26a and 26b via a link 106. Link 104 is mounted to the front zone 96 of gear belt 80 and link 106 is mounted to the rear zone 98 of gear belt 82.

With reference to FIG. 10, the pneumatic actuator 77 includes a reciprocating rod 108 mounted to the clamping member 28aI (and 28bI) via a connector 110.

When the pneumatic actuator 76 extends the rod 108, the rod 108 pushes the clamping member 28aI (and 28bI) in the +X direction. The clamping member 28aI (and 28bI) is mounted to the front zone 96 of gear belt 80 via link 104 and hence causes the front zone 96 of the gear belt 80 to move in the direction shown by D1 (see FIG. 14), the gear belt 80 acts on the pulley member 88 which causes gear belt 82 to rotate in tandem. The clamping member 28aII (and 28bII) is mounted to the rear zone 98 of gear belt 82 via link 106, the rear zone 98 of gear belt 80 moves in the direction shown by D2 which causes the clamping member 28aII (and 28bII) to move in the −X direction. Thereby causing the clamps 28a and 28b to open as shown in FIG. 10.

When the pneumatic actuator 77 retracts the rod 108, the rod 108 pulls the clamping member 28aI (and 28bI) in the −X direction. The clamping member 28aI (and 28bI) causes the gear belt 80 to move in the direction shown by D3 (see FIG. 4). The rear side 98 of gear belt 80 moves in the direction shown by D4 which causes the clamping member 28aI (and 28bII) to move in the +X direction. Thereby causing the clamps 28a and 28b to close as shown in FIG. 11.

With respect to FIGS. 11, 12, 14 and 17, the mobile arms 26a and 26b are pivotally mounted to their elevator supports 24a and 24b respectively via a respective pivot assembly 112. With reference to FIGS. 14 and 17 the pivot assembly 112 comprises a circular bearing assembly 114 mounted to a sliding plate 116 via bolts 118 and fasteners 120. The pivot assembly 112 thereby defines a pivot axis about which the arm 26a and 26 rotates in the R direction as shown in FIGS. 11 and 12. Each arm 26a and 26 includes a pneumatic actuator 122 in the form of a cylinder mounted on the housing 73 (see FIGS. 10-14). The cylinder 122 includes a reciprocating rod 124 (see FIG. 12) pivotally connected to the sliding plate 116.

When the cylinder 122 extends the rod 124 it causes the mobile arm 26a or 26b to rotate from the generally horizontal position to a vertical position about the pivot assembly 112. When the cylinder 122 retracts the rod 124 it causes the mobile arm 26a or 26b to rotate from the generally vertical position to the generally horizontal position.

With reference to FIG. 17, each elevator support 24a and 24b (24a is only shown but 24b is similarly constructed) includes a housing 126 for housing upper and bottom horizontal rails 128 and 130 respectively therein. The housing 126 includes a back panel 131. An actuator 132 such as a rodless pneumatic cylinder is mounted on the housing 132 and covered by cover 134. The cylinder 132 includes an actuating plaque 136, that moves in +X and −X directions along the length of the cylinder 132. The plaque 136 is mounted on the front larger portion 138 of the sliding plate 116. The rear smaller portion 140 of the sliding plate is mounted to upper linear bearings 142 and lower linear bearings 144 via upper and lower connectors 146 and 148 respectively. In this way. The cylinder 132 moves the plaque 136 in the +X and −X directions causing the plaque 136 to move the sliding plate 116 therewith, the sliding plate sliding moving along the which sliding moves along the upper and bottom horizontal rails 128 and 130 and moving the mobile arm 26a or 26b therewith.

As mentioned above each clamp 28a and 28b comprises a respective pair of clamping members 28aI, 28aII and 28bI and 28bII. With reference to FIGS. 18A-18E, the clamping member 28aI (or 28b) engages sheet 150 of film 32, while the clamping members 28aII (or 28bII) engages sheet 152 of film 32. As previously described the pair of clamping members 28aI and 28aII (as mentioned the following applies to clamping members 28bI and 28bII) are moved toward the film 32 with each clamping member 28aI and 28aII being adjacent to a respective sheet 150 and 152. The clamping members 28aI and 28aII comprise respective clamping or gripping elements 154. The gripping elements 154 include a pair of lip assemblies 156 and 158. The lip assemblies 156 and 158 include respective outer sheets 160 and 162 mounted to an actuator 164 in the area 166 between the lip assemblies 154 and 156. First the gripping sides 154 of each clamping members 28aI and 28aII engage the sheets 150 and 152 respectively as shown in FIGS. 18A and 18B. Then the actuator 164 retracts into the area 166 pulling the sheets 160 and 162 which suck in a portion of each sheet 150 and 152 as shown in FIG. 18C. Each lip assembly 156 and 158 include respective pressure members 168 and 170 which swell in order to add gripping pressure to the portion of the sucked in sheets 150 and 152 as shown in FIG. 18D. Once the sheets 150 and 152 are firmly gripped, the clamping members 28aI and 28aII are moved away from one another thereby separating the previously overlapping sheets 150 and 152 as shown in FIG. 18E.

FIGS. 17A to 17B show lip assemblies 256 and 258 which are similar to lip assemblies 156 and 158 except for the configuration of the outer sheets 260 and 262 thereof and hence, FIGS. 17A to 17E require no further description.

The skilled artisan will appreciate that the apparatus 10 also includes sensors (not shown) that can determine the length, width and height of the load. These sensors are in communication with a controller (not shown) such as a computer for example in order to send data thereto. The controller is in communication with the film dispensing and cutting assembly 16, the film conveying device 18 and with the film stretching and bagging device 18 so as to signal the foregoing to operate in a certain way depending on the data received from the sensor or sensors.

It should be noted that the film stretching and bagging device 19 can be installed to a variety of other systems already including the other sub-apparatuses described herein. Therefore in an embodiment, the apparatus 10 may include the film stretching and bagging device 20 only.

The invention will now be described in operation with reference to sequential FIGS. 1 to 9.

FIG. 1 shows a load 12 having been transferred in the +Y direction adjacent to the apparatus 10. A sensor ascertains the length of the load 12 and signals this data to the controller which processes the length of film 32 needed to bag this load 12. As shown, the film 32 has been unrolled from the dispenser 30 and its free end is mounted to the sealing and cutting device 34. The gripping members 39 of the leading lateral clamp 38 grip this free end and convey a predetermined length of this film in the +Y direction as shown in FIG. 2.

FIG. 2 shows that the floating clamp 40 clamps a longitudinal end of the film 32. The length of the film 32 between the floating clamp 40 and leading lateral clamp 38 is the predetermined length required. The film 32 is sealingly cut by the cutting device 34 and the leading and floating clamps 38 and 40 convey this cut film 32 along the rail 42 as shown in FIG. 3. In this way, the cut film 32 is placed adjacently to the stretching and bagging device 20 with its longitudinal ends 200 and 202 being sealed, the longitudinal edge 204 being a closed edge formed by the folding of the two overlapping sheets 150 and 152 and the opposite edge 206 being open. FIG. 3 also shows that the carriages 22a and 22b moved on base frame 23 at distance relative to one another that is dependent on the length of the piece of film 32.

With reference to FIGS. 3 and 4, the mobile arms 26a and 26b are in the generally vertical position causing the clamp 28a and 28b to be in the generally horizontal position. The arms 26a and 26b move in the −X direction along their respective elevator supports 24a and 24b, approaching the film 32, in tandem the clamps 28a and 28b open so as to receive the film 32 between their respective clamping members 28aI, 28aII and 28bI, 28bII respectively and then close so as to clamp the film 32 near the two opposite longitudinal ends 200 and 202 thereof.

With respect to FIG. 5, the leading lateral and floating clamps 38 and 40 release the film 32 thus allowing the mobile arms 26a and 26b to move in the +X direction with the horizontal clamps 28a and 28b moving the film 32 therewith.

Turning now to FIG. 6, the mobile arms 26a and 26b are rotated from the generally vertical position to the generally horizontal position causing the clamps 28a and 28b along with the clamped film 32 to move from the generally horizontal position to the generally vertical position. In this way, the film 32 is placed above the load 12 with its open edge 206 facing the load. The carriages 22a and 22b are moved away from each other, namely carriage 22a is moved in the −Y direction and carriage 22b is moved in the +Y direction in order to stretch the film 32. The carriages 22a and 22b may be moved closer to one another after stretching the film.

Keeping FIGS. 18A-18E and 19A-19E described above in mind, and with reference to FIGS. 6 and 7, each clamping member 28aI and 28bI clamps or grips a sheet 150 and each clamping member 28aII and 28bII clamps or grips a sheet 152. The clamps 28a and 28b are unclamped or opened thereby opening the film 32 above the load 12. More specifically, clamping members 28aI and 28bI are moved in the +X direction bringing with them the gripped sheet 150 and clamping members 28aII and 28bII are moved in the −X direction bringing with them the gripped sheet 152. Hence, the film 32 is opened above the load 12.

With respect to FIGS. 7 and 8, the elevator supports 24a and 24b are moved in the −Z direction along their respective carriages 22a and 22b causing the clamps 28a and 28b holding the opened film 32 to progressively descend onto the load 12 thereby progressively bagging the load 12 in a gradual and resilient manner.

Referring to FIGS. 8 and 9, when the load 12 is fully bagged by the film 32, the clamping members 28aI and 28bI release sheet 150 and the clamping members 28aII and 28bII release the sheet 152. The foregoing provides for moving the clamps 28a and 28b away from the bagged load 12, as the elevator supports 24a and 24b move in the +Z direction along their respective carriages 22a and 22b.

The bagged load 12 may then be transferred for shipment via load transfer 15 in the +X direction.

Therefore, the present invention also provides a methods for bagging material. This methods includes the following steps:

(a) providing a desired length of stretchable film, the film having at least two overlapping sheets and at least one open edge.

(b) stretching the desired length of film by clamping the film on the outer surface thereof at two opposite areas, each opposite area being near a respective longitudinal length of the film and moving said these two clamped areas away from one another;

(c) separating the two overlapping sheets by gripping an outer portion of each sheet and moving the gripped outer portions away from one another thereby opening the film; and

(d) covering the material by progressively moving the film onto the material while maintaining the gripped outer portions.

The clamp, the mobile arm and the elevator support can also be considered a clamp assembly and may be designed and configured in a variety of ways within the context of the present invention. For example, the clamp assembly can comprise a clamp and a robotic arm mounted to a respective carriage. Other clamp assemblies may include multi-prong clamps having three clamping members or more. In another embodiment, the clamping assembly comprises a clamp as well as any intervening assembly for mounting this clamp to a carriage within the scope of the invention. The carriages can be provided in a variety of vertical configurations and designs. The skilled artisan can contemplate various actuator assemblies for imparting movement to the various components described herein within the context of the present invention.

FIG. 20 shows one possible bagging of a load 12 with stretchable film 32 in accordance with an embodiment of the present invention. The film 32 covers load 12 on the top side 210, lateral sides 212 and 214 and front and rear sides 216 and 218, respectively, of the load 12 with the bottom side 220 being left uncovered. At the front and rear sides 216 and 218 the film 32 forms pockets 222 with a generally triangular inner side 224. The pocket 222 has an outer side 226 that is seamed at the middle 228.

FIG. 21 shows a bagging of load 12 in accordance with another embodiment of the present invention. In FIG. 21, the film 32 is the inverted version of FIG. 20. As such, the triangular inner side 224 of FIG. 20 is now a triangular outer side 225, the outer side 226 of FIG. 20 is now an inner side 227 and the middle seam 228 of FIG. 20 is now an inner middle seam 229.

It is to be understood that the invention is not limited in its application to the details of construction and parts illustrated in the accompanying drawings and described hereinabove. The invention is capable of other embodiments and of being practiced in various ways. It is also to be understood that the phraseology or terminology used herein is for the purpose of description and not limitation. Hence, although the present invention has been described hereinabove by way of embodiments thereof, it can be modified, without departing from the spirit, scope and nature of the subject invention as defined in the appended claims.

Claims

1. A method for bagging material into a stretchable film, said method comprising: providing a desired length of stretchable film, said film having at least two overlapping sheets and at least one open edge;stretching said desired length of film by clamping said film on the outer surface thereof at two opposite areas, each said area being near a respective longitudinal length of said film and moving said two clamped areas away from one another;separating, subsequently to stretching said film, said two overlapping sheets by gripping an outer portion of each said sheet and moving said gripped outer portions away from one another thereby opening the film; andcovering the material by progressively moving said film onto the material while maintaining said gripped outer portions.

2. A method according to claim 1, wherein said providing a desired length of film comprises unrolling a desired length of said film and cutting said desired length of said film.

3. A method according to claim 2, wherein said cutting comprises sealing said overlapping sheets at a common longitudinal end.

4. A method according to claim 2, wherein the edge of said film opposite said open edge is closed.

5. A method according to claim 2, wherein the longitudinal ends of said film are sealed.

6. A method according to claim 1, wherein said stretching further comprises moving said clamped film so as to position said open edge above the material.

7. A method according to claim 1, wherein covering the material further comprises releasing said gripped outer portions.