Stacking and strapping system for lumber packages

Abstract

A lumber stacking and strapping system can provide a single-station solution for both lumber stacking and package strapping. In addition, the package strapping system may apply multiple straps simultaneously to the package. For example, a package stacking and strapping system can provide not only a mechanism for formulating a package of lumber one layer at a time, but also a mechanism for lowering a completed package directly into a compression and strapping station, such as using the lumber stacker package accumulation hoist. The stacking and strapping system can then simultaneously apply strapping around the package in multiple positions along the length of the package, with bottom battens and top corner protectors further supplied and strapped into place as desired. A method for stacking and strapping a package in a single location is also provided.

Claims

1. A lumber package accumulation and strapping system, comprising: a package accumulator having accumulation arms that accumulate lumber into an accumulated lumber package; a package strapping system comprising a plurality of strappers arranged proximal to the package accumulator, wherein said strappers are configured to simultaneously strap the accumulated lumber package at multiple locations along a length of the accumulated lumber package before the accumulated lumber package is entirely removed from the package accumulator; and one or more compression arms configured to compress the accumulated lumber package as it is being strapped.

2. The lumber package accumulation and strapping system according to claim 1, wherein the accumulation arms also act as the one or more compression arms.

3. The lumber package accumulation and strapping system according to claim 1, wherein the one or more compressions arms include one or more top compression arms configured to top compress the accumulated lumber package.

4. The lumber package accumulation and strapping system according to claim 3, wherein one or more of the accumulation arms act as one or more of the top compression arms to top compress the accumulated lumber package as it is being strapped.

5. The lumber package accumulation and strapping system according to claim 1, wherein the compression arms comprise one or more side compression arms configured to side compress the accumulated lumber package into a tight bundle.

6. The lumber package accumulation and strapping system according to claim 5, wherein the side compression arms are adjustable to accommodate and compress accumulated packages of various widths.

7. The lumber package accumulation and strapping system according to claim 1, further comprising a lift configured to lower the accumulated lumber package directly into the package strapping system from the package accumulator.

8. The lumber package accumulation and strapping system according to claim 1, wherein one or more of the plurality of strappers has a lengthwise position that is adjustable to apply a strap at any one or more of multiple desired locations along the length of the accumulated lumber package.

9. The lumber package accumulation and strapping system according to claim 1, wherein the package strapping system is further configured to simultaneously strap the accumulated package at three or more positions along a length of the accumulated package.

10. The lumber package accumulation and strapping system according to claim 1, wherein the package accumulator is configured to accumulate organized layers of lumber into a package using a secondary lift, wherein a primary lift of the package accumulator is configured to retrieve the package from the secondary lift, and where the package strapping system is configured to receive the package directly from the primary lift of the package accumulator.

11. A lumber package accumulation and strapping system comprising: a package accumulator having accumulation arms that accumulate lumber into packages, wherein the package accumulator is configured to accumulate organized layers of lumber into a package, wherein a primary lift of the package accumulator is configured to retrieve the package; a package strapping system arranged in a location that is proximal to the package accumulator and configured to receive the package directly from the primary lift of the package accumulator; and one or more compression arms configured to compress the accumulated lumber package as it is being strapped.

12. The lumber package accumulation and strapping system of claim 11, wherein the primary lift is configured to retrieve the package from a secondary lift where the package is accumulated and lower the package directly into the package strapping system.

13. The lumber package accumulation and strapping system of claim 11, wherein the package strapping system comprises a plurality of strapping heads, wherein at least one of the strapping heads is moveable along a length of the package, and wherein the package strapping system is configured to simultaneously strap the package at multiple desired locations along the length of the package.

14. The lumber package accumulation and strapping system of claim 13, wherein the plurality of strapping heads comprises three or more strapping heads, and wherein at least two of the heads are moveable along a length of the package.

15. The lumber package accumulation and strapping system of claim 11, further comprising a corner protector applicator configured to place a corner protector underneath a top layer of the package.

16. The lumber package accumulation and strapping system of claim 11, wherein the primary lift is further configured to act as the one or more compression arms by extending over and top compressing the package after it is arranged in the strapping system.

17. A lumber package accumulation and strapping system, comprising: a package accumulator having one or more accumulation arms configured to accumulate a package comprising multiple layers, each layer comprising an organized layer of lumber; a package strapping system arranged in a location proximal to the package accumulator and configured to receive an accumulated package directly from the package accumulator, said package strapping system comprising a plurality of strappers configured to simultaneously strap the accumulated package at multiple locations along a length of the accumulated package; and one or more compression arms configured to compress the accumulated lumber package as it is being strapped.

18. The lumber package accumulation and strapping system according to claim 17, wherein the one or more accumulation arms are configured to help formulate the package as it is being accumulated and then act as the one or more compression arms by top compressing the package as it is being strapped.

19. The lumber package accumulation and strapping system according to claim 17, wherein one or more of the plurality of strappers has a lengthwise position that is adjustable to apply a strap at any of multiple desired locations along the length of the accumulated package.

20. The lumber package accumulation and strapping system according to claim 17, wherein the package strapping system is configured to receive the package directly from the package accumulator using a lift.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) The foregoing and additional objects, features, and advantages of the present inventive concepts will become more readily apparent from the following detailed description of preferred embodiments, made with reference to the accompanying drawings, in which:

(2) FIGS. 1 through 6 provide various illustrations of a package accumulation and strapping system according to one embodiment of the present inventive concepts to illustrate an operation for accumulating and strapping a package at a single station, wherein:

(3) FIG. 1 is a somewhat schematic side elevation view of a combination package accumulation and strapping system in a first operating position according to one embodiment of the present inventive concepts;

(4) FIG. 2 is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1 in a second operating position;

(5) FIG. 3 is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1 in a third operating position;

(6) FIG. 4 is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1 in a fourth operating position;

(7) FIG. 5 is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1 in a fifth operating position; and

(8) FIG. 6 is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1 in a sixth operating position.

(9) FIGS. 1A through 6A provide various illustrations of a package accumulation and strapping system according to another embodiment of the present inventive concepts to illustrate an operation for accumulating and strapping a package at a single station, wherein:

(10) FIG. 1A is a somewhat schematic side elevation view of a combination package accumulation and strapping system in a first operating position according to another embodiment of the present inventive concepts;

(11) FIG. 2A is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1A in a second operating position;

(12) FIG. 3A is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1A in a third operating position;

(13) FIG. 4A is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1A in a fourth operating position;

(14) FIG. 5A is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1A in a fifth operating position; and

(15) FIG. 6A is a somewhat schematic side elevation view of package accumulation and strapping system of FIG. 1A in a sixth operating position.

(16) FIG. 7 is a somewhat schematic side elevation view of a batten loading system of a combination package accumulation and strapping system according to further aspects of the present inventive concepts;

(17) FIG. 8 is a somewhat schematic front elevation view of the batten loading system of FIG. 7;

(18) FIGS. 9 through 12 provide various illustrations of a package accumulation and strapping system to illustrate an operating sequence for positioning battens below an accumulated package (or a package to be accumulated) in the package accumulation and strapping system, wherein:

(19) FIG. 9 is a somewhat schematic top elevation view of a package accumulation and strapping system in a first operating position, illustrating an operation for positioning battens below an accumulated package according to a still further aspect of the present inventive concepts;

(20) FIG. 10 is a somewhat schematic top elevation view of the package accumulation and strapping system of FIG. 9 in a second operating position;

(21) FIG. 11 is a somewhat schematic front elevation view of one of the batten positioning systems of FIG. 10, illustrating a third operating position;

(22) FIG. 12 is a somewhat schematic front elevation view of the package accumulation and strapping system of FIG. 9, illustrating a fourth operating position; and

(23) FIG. 12A is an enlarged view of a portion of the package accumulation and strapping system of FIG. 12.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

(24) Various features, benefits, and configurations incorporating the principles of the present inventive concepts in illustrative embodiments are shown and described in detail in the accompanying documents and drawings, the contents of which are incorporated by reference in their entirety. Additional features, benefits and configurations will be readily apparent to those of ordinary skill in the art based on this disclosure and all such features, benefits and configurations are considered within the scope of the present invention. Various illustrative embodiments will now be described in connection with the accompanying drawings.

(25) FIGS. 1 through 6 and 9 through 12 illustrate a process for accumulating and strapping a package at a single station using a package accumulation and strapping system 50 according to one embodiment of the present inventive concepts. Referring to FIGS. 1 through 6 and 9 through 12, according to principles of the present inventive concepts, a package 80 is accumulated at an accumulation hoist 102 (including a secondary lift 106) located at an output end of a material stacker 100. Without being moved to another station, the accumulated package 80 can be lowered onto battens 82 in a strapping system 200 and strapped at multiple locations along the length of the package 80 to secure the package 80.

(26) This single-station process for formulating (accumulating) and strapping a package of lumber (or other material) can further provide both top corner protectors 84 aligned under the strap 86 and a batten 82 aligned and attached to the bottom of the package 80. The package 80 can therefore be secured together in a way that transportation of the package 80 from the package accumulator (stacker) 100 can be accomplished without risk of package separation or disintegration.

(27) According to principles of the inventive concepts, multiple straps 86 can be simultaneously attached to the package 80 at multiple desired locations. Where bunks/battens 82 are provided, the multiple strap locations preferably correspond to the locations of the bunks/battens 82. Multiple strappers (with strap reels, strapping heads, and bunk applicators, for instance) 202 may be provided to simultaneously strap the package 80 at the multiple locations.

(28) Packages of lumber, for instance, generally require two straps for 6′, 8′, 10′, and 12′ package lengths, and three straps for 14′, and 16′ package lengths. Longer package lengths may require even more straps, and additional straps could also be applied to shorter packages. The desired locations for the straps (and therefore the strappers) may vary depending on the length of the package.

(29) For instance, for an 8′ package, straps may be applied at the 2′ and 6′ locations. For a 10′ package, straps may be applied at the 2′ and 8′ locations. For a 12′ package, straps may be applied at the 2′ and 10′ locations. For a 14′ package, straps may be applied at the 2′, 7′, and 12′ locations. And for a 16′ package, straps may be applied at the 2′, 8′, and 14′ locations.

(30) To provide straps at these various locations, multiple strappers 202 can be provided and can have either a fixed or an adjustable position. For example, a first strapper 202a can be arranged at the 2′ location and can have a fixed, first position since this strapping location remains the same for all package lengths. The first strapper 202a supplies a first strap 86a at the first position. A second strapper 202b can be provided to apply a second strap 86b at a second location. The second location may, for instance, be the 6′, 7′, or 8′ position depending upon the length of the package 80. The location of the second strapper 202b is therefore preferably adjustable between the 6′, 7′, and 8′ locations to apply a strap 86 at the desired second location based upon the package length. A third strapper 202c can likewise be provided and can be adjustable between the 10′, 12′, and 14′ locations to provide a third strap 86c at an appropriate third location (if desired) depending upon the package length. Additional strappers 202d for providing additional straps 86d can be provided for packages longer than 16′ (or for packages shorter than 16′ when additional straps are desired) and can also be configured to be adjustable between various desired positions or arranged in fixed positions. The inventive concepts are, of course, not limited to these specific strapper positions and adjustabilities, and any other combination of strapper positions and adjustabilities is within the scope of the inventive concepts.

(31) Referring now specifically to FIG. 1, as a first step in a package strapping process, once a package 80 has been sufficiently assembled in the lumber stacker 100, a corner protector strip magazine 210 places a corner protector strip (e.g., a 60″ long strip) 84 onto a desired package layer, such as the second to last layer 80a (e.g., layer 7 of an 8-layer package or layer 15 of a 16-layer package) for a top corner protector strip. The corner protectors are 84 preferably applied at each strap line (i.e., where each strap will be secured). The top or final layer 80b (e.g., the 8.sup.th layer of an 8-layer package or 16.sup.th layer of a 16-layer package) is then stacked on top of the second to last layer 80a, trapping the corner protector strip 84 in place with vertical wings 84a of the corner protector strip 84 extending horizontally beyond the sides of the package 80. The corner protector strip magazine 210 is preferably raised when not in use for better operator access to the stacking operation. The corner protector strips 84 may, for example, be 60″ long to accommodate 2″ and 4″ thick lumber. The strips 84 can also be used as intermediate layer tie strips for loose and unstable packages of lower grade 2×4's and the like.

(32) Some systems may be configured to assemble and strap packages without bunks/battens. In addition to the top corner protectors, such systems may further be configured to provide bottom corner protectors. Although not illustrated or described herein, the mechanism and manner for applying the bottom corner protector may be similar to that for applying the top corner protector.

(33) Referring now to FIG. 2, the secondary lift 106 accumulates a desired package size (e.g., 8, 16, or 20 layers) of a desired material (e.g., 2″ thick lumber or other material having a desired thickness). The primary lift 104 then retrieves a full or partial package from the secondary lift 106, allowing any partial packages to be completed, and then lowers a full (completed) package 80 onto battens 82 arranged on the raised lift skids 220 with the top strap track 204 retracted. As the package 80 is lowered into position, rails along the sides of the package 80 fold the corner protector strip wings 84a from the horizontal to the vertical position. The secondary lift 106 moves back into the up and extended position to begin receiving layers of lumber for a subsequent package while the primary lift 104 lowers the full package 80 onto the battens 82. The bottom bunks/battens 82 are already located in place on the bunk chains 222 or raised lift skids 220, aligned to the strap lines. This can be accomplished, for instance, using a process such as that described later with reference to FIGS. 7 through 12.

(34) Referring now to FIG. 3, once the finished package 80 is in the down position resting on the bunks/battens 82, the primary lift arms 104 retract. At this point, the bunks 82 are in a raised position on lift skids 220 above corresponding bunk chains 222. A strapping head 204 is positioned to the side of the package, along with side press (or compression) arms 110. The strapping head 204 feeds strap to a strap track 206 with the top strap track lance 208 extended, along with fixed bottom track 211 and far side track 212.

(35) Referring to FIG. 4, the retracted primary lift arms 104 raise above the top elevation of the finished package 80 sitting on the bunks 82 and raised lift skids 220, extend out over the package 80 and then compress the top 80b of the package 80 in unison with the side compression arms 110 compressing the side 80c of the package 80. The primary lift arms 104 can therefore be used to provide top compression arms for the package 80. The side compression arms 110 may also be used to place the sealer/strapping head 204 snug to the side of the package 80. In other embodiments, the strapping heads 204 may be self-propelled to move to and away from the side of the package 80 on their own.

(36) Referring to FIG. 5, while the top and side compression arms 104, 110, respectively, compress the stacked lumber into a tight package 80, the strap 86 can be cinched, sealed, and cut in the strap head 204. The vertical wings 84a of the corner protection strips 84 are folded horizontally against the top of the package 80b as the strap 86 is tensioned, providing the lumber package 80 with top corner protection.

(37) Referring finally to FIG. 6, once the package 80 has been strapped, the lift skids 220 lower the strapped package 80 to the bunk chains 222 and it is discharged. After strapping, the primary lift arms 104 can be raised and retrieve the next package from the secondary lift 106. The retrieved package from the secondary lift 106 is finished out as necessary and lowered to the first sequence position illustrated in FIG. 1 and the process can then be repeated.

(38) FIGS. 1A through 6A illustrate an alternative embodiment of the present inventive concepts. While the overall process of this embodiment may be substantially similar to the process just described, some differences may exist. For instance, these differences may include applying top corner protectors onto fully accumulated packages during a second step in the process. Like elements are referred to using like numerals.

(39) Referring to FIGS. 1A through 6A, the secondary lift 106 accumulates a desired number of layers of material (for instance, 8 or 16 layers of 2″ thick lumber). The primary lift 104 retrieves a full or partial package from the secondary lift 106, allowing any partial packages to be completed, and lowers the full package 80 to the outfeed transfer 108. The bottom bunks/battens 82 are already in place, for instance using the method described later with respect to FIGS. 7-12 herein. The secondary lift 106 then moves back into the up and extended position to begin receiving layers of lumber for a subsequent package while the primary lift 104 lowers a full package 80 onto the bunks/battens 82.

(40) The primary lift arms 104 can be retracted once the finished package 80 is in the down position. Top corner protectors 84 may be applied as needed or desired. The strapping head 204 either feeds strap 86 to a strap track device with top and bottom retracting tracks, and fixed far side track, or the primary lift arms 104 may secure the strap 86 from the strap head with a grabber-like device and pull it under the corresponding bunk 82 and/or the package 80 without a bunk.

(41) As one possible method for wrapping the strap 86 around the package 80, the retracted primary lift arms 104 may be raised above the top elevation of the finished package 80 on the outfeed transfer 108 along with the secured strap 86, thereby positioning the strap 86 around the backside 80d of the package 80. Of course, there are numerous other methods available to wrap the strap 86 around the package 80 and return it to the strap head 204, any of which are acceptable and contemplated by the present inventive principles.

(42) The primary lift arms 104 may be extended out over the finished package 80 with the secured strap 86 and feed the strap into the strap head 204. Top and side compression arms 104, 110, respectively, may further be activated to compress the package 80 as the strap 86 is being cinched, sealed, and cut in the strap head 204.

(43) To prepare for the next process, bunks 82 may be slid onto the primary lift arms 104, or onto trays 112 mounted elsewhere, before the primary lift arms 104 return to the up position to retrieve the package being accumulated. The primary lift arms 104 are then raised with the bunks 82 in place (or without bunks if no bunks are desired), and retrieve the package 80 from the secondary lift 106 to finish out the package 80 as necessary and then lower the package 80 to the starting position to repeat the process.

(44) As indicated previously, it may be desirable to attach bunks/battens 82 to the package 80 to accommodate fork lift arms or the like for package transportation, and to further facilitate stacking and storage of packages 80. FIGS. 7 and 8 illustrate a batten loading system 300 according to further aspects of the present inventive concepts. FIGS. 9 through 12 illustrate a batten positioning system 350 and its method of operation in connection with the package accumulation and strapping system 50 described previously, according to still further aspects of the present inventive concepts. Referring now to FIGS. 7 through 12, an operation of the batten loading and positioning systems 300, 350, respectively, in combination with the package accumulation and strapping system 50 will now be explained.

(45) Referring first to FIGS. 7 and 8, a batten loading system 300 may include a batten magazine 310 that is loaded with battens 82. The magazine 310 may include a retractable bottom 312 that retracts to allow a lower first batten 82a to drop from the magazine 310 into a batten charging pan 302 at the appropriate time. A batten pinch 304 may be arranged near a batten 82b located second from the bottom in the batten magazine 310 to prevent feeding multiple battens 82 into the batten charging pan 302. The retractable bottom 312 and batten pinch 304 may be electronically controlled under control of an electronic control system 400 to efficiently control the timing of the batten loading process.

(46) The batten loading process may begin by manually loading battens 82 into the batten magazine 310. Each batten 82 may, for example, be a 1.5″×2.5″×45″ long batten having a 1″ wide strap groove 83 formed in the bottom thereof. The stack of battens in the batten magazine 310 may be gravity fed to a charging pan 302 located below the batten magazine 310. The stack of battens in the batten magazine can be held in place by a batten pinch 304 that secures the second to the bottom batten 82b in place while the batten feeder opens the retractable bottom 312 to allow the bottom batten 82a to pass through a bottom opening 313 in the magazine 310 and load into the charging pan 302.

(47) Referring still to FIGS. 7 and 8 and additionally to FIGS. 9 through 12, a batten positioning system 350 may be used to position the loaded battens 82 below the package 80. After a batten 82 is loaded into the charging pan 302, the charging pan 302 extends out over the batten chains 222 and lowered lift skids 220. A rake off 303 then drops down behind the loaded batten 82 to cause the batten 82 to slide off the charging pan 302 onto the batten chains 222 as the charging pan 302 is retracted. The batten 82 can then be positioned to receive a package 80 thereon, and the charging pan 302 is moved back into place to receive another batten 82.

(48) After battens 82 are loaded onto the batten chains 222 at their desired positions by the batten loading system 300, the battens 82 are then crowded by running the batten chains 222 and the batten tipple 224 until the battens 82 hit the stops 226 located by the strap lines. The batten tipple 224 is then in the up position.

(49) The lift skids 220 are raised with the battens 82 in the lift skid cradles 228 and are ready to receive a finished package 80 from the package accumulation hoist arms 104. The package 80 is then lowered onto the battens 82 within the lift skid cradles 228, and the package accumulation arms 104 continue down into the package accumulation arm lift skid slots 230 until they are clear of the bottom of the package 80. The package arm tipples 232 are moved to the lower position to allow clearance for the package accumulation arms 104 to retract out from under the package 80.

(50) Once clear to retract, the package accumulation arms 104 can then be retracted and cycle up and then over the assembled package 80 with the strap track to top compress the package 80 while it is being strapped, as explained previously. The side compression arms 110 can work in unison with the top compression arms 104 and the strap sealer/strapping head 204, bringing the strap 86 snug with the side of the tightly formed package 80. In this manner, a strap 86 can be wrapped around each of the battens 82 and fit snugly within the strap groove 83 on the bottom of the batten 82 when the strap 86 is tightened and sealed. The side compression arms 110 and strapper head 204 could be integral with one another, or the strapper head 204 could be independently arranged.

(51) The lift skids 220 remain in the up position, cradling the battens 82 while the package 80 is being strapped. Once the package 80 is strapped, the batten and package arm tipples 224, 232, respectively, are both raised to the horizontal position to receive the package 80 strapped to the battens 82 and then discharge the strapped package 80 using the tipples 224, 232 and batten chains 222.

(52) Alternatively, the battens 82 may be placed directly into batten saddles 221 on the raised lift skids 220 using bunk/batten applicators 330. The bunk/batten applicators 330 may, for instance, be arranged on the same carriages as the side-shiftable strappers 202. The bunk applicator 330 could be configured to place a bunk 82 into the saddle 221 on the raised lift skid 220. The strapper 202 could then be shifted over the bunk 82 to apply the strap 86. This system could prove more efficient than crowding bunks to stops.

(53) Having described and illustrated principles of the present invention in various preferred embodiments thereof, it should be apparent that the invention can be modified in arrangement and detail without departing from such principles.