CA2271609A1 - Automated precision log pre-positioning and log turning system - Google Patents
Automated precision log pre-positioning and log turning system Download PDFInfo
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Abstract
An automated log pre-positioning and turning system including a log manipulating mechanism with a C-shaped positioning unit for capturing, rotating, skewing, or otherwise moving logs. The system may be used to entirely replace antiquated sawmill systems or may be used in part to replace antiquated turning elements with the inventive log manipulating mechanism and its C-shaped positioning unit. The log manipulating mechanism is designed to operate in cooperation with computerized scanning equipment without requiring excessive modifications to do so. With relatively few mechanical parts, the log manipulating mechanism includes both rotational and skewing capabilities to position a log quickly and automatically with both precision and finesse.
This provides new and useful pre-positioning, turning, and skewing features that increases sawmill productivity, while effectively decreasing log waste.
This provides new and useful pre-positioning, turning, and skewing features that increases sawmill productivity, while effectively decreasing log waste.
Description
AUTOMATED PRECISION LOG PRE-POSITIONING
AND LOG TURNING SYSTEM
BACKGROUND OF THE INVENTION
Field of Invention The present invention relates generally to the field of sawmill equipment.
More particularly, the present invention relai:es to a device for providing fast and precise log positioning in a sawmill setting. More particular yet, the present invention involves an improved log turner for automated precise turning and positioning of raw logs before and during sawing.
Description of Prior-art While the general lumber industry involves many problems associated with obtaining an increased yield of lumber from raw logs of lesser and lesser quality, the more specific problem of obtaining the highest yield of logs from raw lumber during the sawing process will be discussed) herein. In the sawmill industry, it is becoming more common to automate the: processing of raw logs into end products as automation offers significant advantages in terms of processing speed, reliability, and cost. It should be noted that this discussion is limited to the specific field of sawmill processes for the sole purpose of illustrative clarity and is not meant to limit the intended scope of the invention.
In handling raw logs during any sawmill operation, the logs are generally carried on conveyor belts between processing equipment that performs specific tasks on the logs. For example, in the processing of logs into sawed lumber, there are a number of steps involved. First, a group of raw logs are processed by equipment that separates the group into individual logs. Each individual log is then processed by de-barking equipment. The logs are then fed on a conveyor past scanning equipment that analyses the cross-sectional area of each log and determines the orientation of the log for maximum recovery or conversion into saleable product. An example of such scanning equipment can be found in U.S.
Patent No. 4,139,035 issued to Bystedt Ea al. where a log is positioned via scanners to determine a preferred saw line. In prior-art devices such as Bystedt et al., the log is then passed by orienting equipment that rotates the log to the desired orientation and onto the sawing equipment that cuts the log into raw lumber. An additional step may also involve cutting the logs into set lengths at some stage in the process. An important part of this automatic processing of logs as outlined above is the orientation of the lod to ensure maximum recovery.
Conventional equipment known as "flying vertical rolls" have also been developed to adjust the orientation of logs in response to control signals generated by computer scanning equipment. The scanning equipment determines the angle to which a log should be rotated and the "flying vertical rolls" carry out the rotation of the log about its longitudinal axis.
Conventional equipment comprises one or more pairs of spaced, upstanding spike rolls positioned on either side of a conveyor belt that define a passage through which a log to be rotated passes. The spike rolls are cylindrical members with radially extending spikes to grip and engage the log. The upstanding spike rolls are driven to rotate about their vertical axis thereby causing a log in the passage befinreen the rolls to be advanced forward. The term "flying" in the name of the equipment refers to the fact that the log moves continuously through the passage even as it is being oriented. The spike rolls .are also adapted for movement along the vertical axis about which they rotate. Moving a spike roll on one side of a log along the vertical axis while maintaining the position of the spike roll on the other side of the log causes the log to rotate to a new angle.
In addition to the "flying vertical roll" equipment, there more commonly exists the "Hill-type" turner equipment. Based upon technologies perfected during the last century by the William E. Hill Manufacturing Company of Kalamazoo, Michigan, Hill-type turners have: endured for more than 100 years as the predominant sawmill device for turning r<~w logs. Hill-type turners are devices that include a vertical bar having pivoting teeth. The bar travels tangentially upward against the face of a log allowing the protruding teeth to engage the log and force it to rotate. The bar also rocks back and forth towards and away from the log face to allow for irregularities in the log surface.
While earlier versions of the Hill-type turner were actuated via steam pistons, contemporary versions utilize current hydraulics to actuate the vertical bar. However, operation of such Hill-type turners has remained virtually unchanged such that manual control by a sawmill operator is required. Such manual control occurs via a control handle that is rocked leftlright for corresponding up/down movement of the vertical bar. The control handle is rocked forward and back for related back and forth movement of the vertical bar towards and away from the log face. Such manual control is an acquired skill that is highly subject to the vagaries of human error. Indeed, many months of costly training is involved for a sawmill operator to even become productive in using a Hill-type turner and mastery of such manual control is rare.
Various known devices exist that opE:rate fundamentally the same as the Hill-type turner. That is to say, such known devices exist for orienting logs that effect log rotation by tangentially applying forces to the log surface. For example, U.S. Patent No. 3,269,432 issued to Mello>ht et al. discloses a vertically oriented chain for rotating a log against a fixed abutment. Even more recently, U.S.
Patent No. 4,102,229 issued to Pryor et al. discloses a log turner having a rectangular hollow bar that includes pivotable teeth. The bar is manipulated for tangential movement astride a log so as to allow the teeth to pivot when contacting the log. Vertical movement of the bar then transfers rotational motion to the log via the teeth in order to effect a lod turn.
Such prior-art devices, while relativel~,r simply constructed and maintained, limit the efficiency of a log cutting operation because each exhibits cumbersome movement of the log. Further, time-consuming steps are needed to prevent axial rotation of the log while the log is being engaged and rotated to the desired orientation by the log turner. Accordingly, an otherwise continuous line of production is interrupted. Moreover, once the given prior-art device turns the log, the log is unclamped and able to roll back to an undesirable orientation while it is progressing to a subsequent processing station.
AND LOG TURNING SYSTEM
BACKGROUND OF THE INVENTION
Field of Invention The present invention relates generally to the field of sawmill equipment.
More particularly, the present invention relai:es to a device for providing fast and precise log positioning in a sawmill setting. More particular yet, the present invention involves an improved log turner for automated precise turning and positioning of raw logs before and during sawing.
Description of Prior-art While the general lumber industry involves many problems associated with obtaining an increased yield of lumber from raw logs of lesser and lesser quality, the more specific problem of obtaining the highest yield of logs from raw lumber during the sawing process will be discussed) herein. In the sawmill industry, it is becoming more common to automate the: processing of raw logs into end products as automation offers significant advantages in terms of processing speed, reliability, and cost. It should be noted that this discussion is limited to the specific field of sawmill processes for the sole purpose of illustrative clarity and is not meant to limit the intended scope of the invention.
In handling raw logs during any sawmill operation, the logs are generally carried on conveyor belts between processing equipment that performs specific tasks on the logs. For example, in the processing of logs into sawed lumber, there are a number of steps involved. First, a group of raw logs are processed by equipment that separates the group into individual logs. Each individual log is then processed by de-barking equipment. The logs are then fed on a conveyor past scanning equipment that analyses the cross-sectional area of each log and determines the orientation of the log for maximum recovery or conversion into saleable product. An example of such scanning equipment can be found in U.S.
Patent No. 4,139,035 issued to Bystedt Ea al. where a log is positioned via scanners to determine a preferred saw line. In prior-art devices such as Bystedt et al., the log is then passed by orienting equipment that rotates the log to the desired orientation and onto the sawing equipment that cuts the log into raw lumber. An additional step may also involve cutting the logs into set lengths at some stage in the process. An important part of this automatic processing of logs as outlined above is the orientation of the lod to ensure maximum recovery.
Conventional equipment known as "flying vertical rolls" have also been developed to adjust the orientation of logs in response to control signals generated by computer scanning equipment. The scanning equipment determines the angle to which a log should be rotated and the "flying vertical rolls" carry out the rotation of the log about its longitudinal axis.
Conventional equipment comprises one or more pairs of spaced, upstanding spike rolls positioned on either side of a conveyor belt that define a passage through which a log to be rotated passes. The spike rolls are cylindrical members with radially extending spikes to grip and engage the log. The upstanding spike rolls are driven to rotate about their vertical axis thereby causing a log in the passage befinreen the rolls to be advanced forward. The term "flying" in the name of the equipment refers to the fact that the log moves continuously through the passage even as it is being oriented. The spike rolls .are also adapted for movement along the vertical axis about which they rotate. Moving a spike roll on one side of a log along the vertical axis while maintaining the position of the spike roll on the other side of the log causes the log to rotate to a new angle.
In addition to the "flying vertical roll" equipment, there more commonly exists the "Hill-type" turner equipment. Based upon technologies perfected during the last century by the William E. Hill Manufacturing Company of Kalamazoo, Michigan, Hill-type turners have: endured for more than 100 years as the predominant sawmill device for turning r<~w logs. Hill-type turners are devices that include a vertical bar having pivoting teeth. The bar travels tangentially upward against the face of a log allowing the protruding teeth to engage the log and force it to rotate. The bar also rocks back and forth towards and away from the log face to allow for irregularities in the log surface.
While earlier versions of the Hill-type turner were actuated via steam pistons, contemporary versions utilize current hydraulics to actuate the vertical bar. However, operation of such Hill-type turners has remained virtually unchanged such that manual control by a sawmill operator is required. Such manual control occurs via a control handle that is rocked leftlright for corresponding up/down movement of the vertical bar. The control handle is rocked forward and back for related back and forth movement of the vertical bar towards and away from the log face. Such manual control is an acquired skill that is highly subject to the vagaries of human error. Indeed, many months of costly training is involved for a sawmill operator to even become productive in using a Hill-type turner and mastery of such manual control is rare.
Various known devices exist that opE:rate fundamentally the same as the Hill-type turner. That is to say, such known devices exist for orienting logs that effect log rotation by tangentially applying forces to the log surface. For example, U.S. Patent No. 3,269,432 issued to Mello>ht et al. discloses a vertically oriented chain for rotating a log against a fixed abutment. Even more recently, U.S.
Patent No. 4,102,229 issued to Pryor et al. discloses a log turner having a rectangular hollow bar that includes pivotable teeth. The bar is manipulated for tangential movement astride a log so as to allow the teeth to pivot when contacting the log. Vertical movement of the bar then transfers rotational motion to the log via the teeth in order to effect a lod turn.
Such prior-art devices, while relativel~,r simply constructed and maintained, limit the efficiency of a log cutting operation because each exhibits cumbersome movement of the log. Further, time-consuming steps are needed to prevent axial rotation of the log while the log is being engaged and rotated to the desired orientation by the log turner. Accordingly, an otherwise continuous line of production is interrupted. Moreover, once the given prior-art device turns the log, the log is unclamped and able to roll back to an undesirable orientation while it is progressing to a subsequent processing station.
Although, the "flying vertical roll" and "Hill-type turner" equipment do perform log rotation, these types of prior-art turners suffer from the significant drawbacks that accurate angular rotation of a log is difficult to achieve.
Further, lengthwise skewing of the log is not practical using the prior-art devices.
The calculations needed for such vertical movement of one or more spike rolls or toothed bars to rotate a log through a selec~~ted angle is quite complex.
Because a log is essentially a tapered cylinder, rotating the log axis through a given angle by a tangential vertical movement at the perimeter of the log will depend on the circumference of the log at the point of engagement of the spike rolls.
Therefore, it is necessary to take many variables into account.
Such variables include, among others, the feed speed of the log through the equipment, the time of engagement with the spike/teeth, and the overall surface irregularities of each log. These variables are needed to be able to calculate the circumference of the portion of the log that is engaged by the spike/teeth when the log is to be rotated. Further, raw logs tend to have a curvature or "sweep" that must be taken into account when determining the vertical movement of the spikelteeth. It is readily apparent that the accuracy of operation of the prior-art devices is greatly diminished by the asymmetrical nature of raw logs having knots or other defects. Such asymmetrical defects in the log will result in slippage of the spikelteeth along the log. In sum, it is extremely difficult to achieve optimum angular positioning of a raw log using such "flying vertical roll" and "Hill-type turner" equipment.
Indeed, none of the prior-art references discussed above adequately provide for the finesse necessary to quickly and accurately position raw logs to enable the best cuts of lumber from any given log. Contemporary improvements in these prior-art devices have been limited to cumbersome designs that combine useful log-scanning technologies with sorely antiquated log-turning technologies.
The prior-art devices do not provide any features that would quickly and accurately allow total scanning of each log so as to pre-position the log.
Further, the prior-art devices do not provide any features that would quickly and accurately provide re-positioning of the log between cuts. Such ineffective log positioning using the prior-art devices not only results in slower production of lumber, but also results in undesirable waste of raw lumber due to inaccurate positioning and cutting even in the presence of current scanning technologies.
Accordingly, it is desirable to provide for a new and improved, effective positioning device for such purposes as, but not limited to, log pre-positioning and turning during sawmill processing. What is needed is such a positioning device that substantially automates sawmill operation during all stages -i.e., scanning, pre-positioning, cutting, and turning stages. What is also needed is such a positioning device that increases production of lumber with a related reduction in waste. What is further needed is such a positioning device that can be used either to replace antiquated systems entirely or enhance the efficiency of a contemporary scanning system using antiquated turning elements. Still, what is needed is such a positioning device that is able to operate in cooperation with computerized scanning equipment and does not require excessive modifications to do so. Still further, what is needed is such a positioning device that includes both rotational and skewing capabilities, all while requiring relatively few mechanical parts. Yet still further, what is needed is such a positioning device which overcomes at least some of the disadvantages of the prior-art while providing new and useful pre-positioning, turning, and skewing features.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a new and improved, effective automated log pre-positioning and turning system that provides precision pre-positioning of raw logs and highly accurate turning of such logs along with skewing movement during sawmill processing. It is another objective of the present invention to provide such an automated log pre-positioning and turning system that utilizes computerized automation of sawmill operation during all stages including scanning, pre-positioning, cutting, and turning (with skewing) without human intervention. Thus, the preaent invention substantially eliminates human error and related waste of mill time and log resources. Another objective of the present invention is to provide such an automated log pre-positioning and turning system that entirely replaces antiqu<3ted systems or may be used in-part to replace antiquated turning elements so as to increase the efficiency of a contemporary scanning system still using such antiquated turning elements.
Still another objective of the present invention is to provide an automated log pre-positioning and turning system that delivers increased finesse in manipulation of raw logs while not interfering or jeopardizing other sawmill processes. Yet still another objective of the present invention to provide an automated log pre-positioning and turning system that operates in cooperation with computerized scanning equipment without requiring excessive modifications to do so. Such an automated log pre-positioning and turning system includes both rotational and skewing capabilities, yet requires few mechanical parts.
The present invention is directed to <~n automated log pre-positioning and turning system that includes a hydraulically actuated log manipulating mechanism with an integrated C-shaped element (hereinafter "positioning unit") useful for, but not limited to, sawmill purposes such as capturing, positioning, skewing, rotating, and transporting logs. In addition to the hydraulically actuated log manipulating mechanism with its positioning unit, the overall inventive system includes a stop and loader section, a conveyor section, a scanning section, a carriage section, and a sawing section. The stop and loader section provides a means for loading raw logs from a log deck one at a time into a pre-positioning area. Within the pre-positioning area, the conveyor section provides a means for conveying a log through a trough into a roller area. In the roller area, turning wheels rotate the log at least one complete rotation so that the scanning section can electronically scan the log. This electronic scanning functions to capture the log's dimensional information, calculate the optimal cutting solution for the given log, and output operational commands to the log manipulating mechanism, the carriage section, and the sawing section.
Moreover, after the log passes through the scanning area, the log manipulating mechanism is utilized to capture the log within the positioning unit.
In response to computer-generated operational commands derived from the scanning process, the log manipulating mechanism moves to secure the log within its positioning unit and rotate and skew the log to the log's predetermined best opening face (BOF). The BOF represents the initial lengthwise cut to the log that will optimize the quality and quantity of the resulting lumber. Once rotated and skewed to the BOF, the log is deposited onto the carriage section by the log manipulating mechanism. The carriage section includes multiple headblocks that hold the log onto a movable carriage. Each headblock moves in response to the given shape of the log. That is to say, the headblocks are actuated (e.g., hydraulically, electromechanically, ..etc.) in response to computer commands derived from the scanning process such that the multiple headblocks together conform to the given log shape. While the headblocks might be aligned identically for a very straight log, they may each be positioned drastically differently for a particularly crooked or knotty log.
The headblocks in the carriage section will maintain the log on the movable carriage. The movable carriage is movable in two directions and allows for multiple passes through the sawing section. The first direction moves the BOF (and subsequent cuts) past a bandsaw, or similar sawing device, in a back and forth motion along the length of the log. While the sawmill described herein is a carriage-type sawmill, it should be noted that any type of sawmill will benefit from the features of the present invention. A single pass results in a single cut of lumber from the log. After each pass, the movable carriage incrementally moves the open face of the log towards the bandsaw. This results in varying lumber thickness according to the given increment of movement. This is continued until the pre-determined point for log turning is reached. That pre-determined point having been calculated during the scanning process.
At that pre-determined point where all cuts on the first face (BOF and the successive cuts) have been made, the loc,~ manipulating mechanism will again capture the log and rotate the log by eith~ar a quarter turn (90°) or a half turn (180°). According, to the commands derived from the scanning process, additional skewing may or may not be necessary. Though it should be noted that it is possible to skew the log at any time while the log manipulating mechanism holds it. This becomes a critically useful feature when a raw log having a significant sweep is encountered. After such rotation (with or without skewing) to the second face to be cut, the log manipulating mechanism will re-deposit the log into the carriage section. Again, the headblocks will adjust to the changing shape of the cut log so as to secure the log for several passes into the sawing section.
This cutting, re-positioning, cutting process is repeated until all possible cuts have been made and all lumber acquired from the given log. At such point, a new log enters the system and is milled accordingly.
An important aspect of the present invention is that the next log to be milled may be deposited into the conveyor section and scanned while the last cutting passes are being made to the previous log. In this way, the log manipulating mechanism can deposit the next log onto the carriage section upon completion of the final cut of the previous log. This allows the immediate commencement of the cutting of the next log. This elimination of any required log adjustments on the movable carriage prior to cutting virtually keeps a tog constantly in the sawing section. This reprE~sents a substantial benefit over prior-art positioning systems and turning devices Overall, it should be understood that elements such as conveyors, rollers, carriages, bandsaws, electronic scanning equipment, computer controllers, hydraulic cylinders, electrical solenoids, wiring harnesses and electrical connection devices, and various related and similar devices may be used within the present invention. However, the specificity of such related and similar devices is a secondary consideration as compared to the primary features embodied in the present invention. That is to say, the log manipulating mechanism and its incorporation into and inter-relation to the inventive system as a whole is considered to embody that which is considered the invention.
Further, it should be readily apparent that many diffE:rent combinations of such related and similar devices may be utilized within the inventive system in cooperation with the log manipulating mechanism without straying from the intended scope of the present invention.
Further, lengthwise skewing of the log is not practical using the prior-art devices.
The calculations needed for such vertical movement of one or more spike rolls or toothed bars to rotate a log through a selec~~ted angle is quite complex.
Because a log is essentially a tapered cylinder, rotating the log axis through a given angle by a tangential vertical movement at the perimeter of the log will depend on the circumference of the log at the point of engagement of the spike rolls.
Therefore, it is necessary to take many variables into account.
Such variables include, among others, the feed speed of the log through the equipment, the time of engagement with the spike/teeth, and the overall surface irregularities of each log. These variables are needed to be able to calculate the circumference of the portion of the log that is engaged by the spike/teeth when the log is to be rotated. Further, raw logs tend to have a curvature or "sweep" that must be taken into account when determining the vertical movement of the spikelteeth. It is readily apparent that the accuracy of operation of the prior-art devices is greatly diminished by the asymmetrical nature of raw logs having knots or other defects. Such asymmetrical defects in the log will result in slippage of the spikelteeth along the log. In sum, it is extremely difficult to achieve optimum angular positioning of a raw log using such "flying vertical roll" and "Hill-type turner" equipment.
Indeed, none of the prior-art references discussed above adequately provide for the finesse necessary to quickly and accurately position raw logs to enable the best cuts of lumber from any given log. Contemporary improvements in these prior-art devices have been limited to cumbersome designs that combine useful log-scanning technologies with sorely antiquated log-turning technologies.
The prior-art devices do not provide any features that would quickly and accurately allow total scanning of each log so as to pre-position the log.
Further, the prior-art devices do not provide any features that would quickly and accurately provide re-positioning of the log between cuts. Such ineffective log positioning using the prior-art devices not only results in slower production of lumber, but also results in undesirable waste of raw lumber due to inaccurate positioning and cutting even in the presence of current scanning technologies.
Accordingly, it is desirable to provide for a new and improved, effective positioning device for such purposes as, but not limited to, log pre-positioning and turning during sawmill processing. What is needed is such a positioning device that substantially automates sawmill operation during all stages -i.e., scanning, pre-positioning, cutting, and turning stages. What is also needed is such a positioning device that increases production of lumber with a related reduction in waste. What is further needed is such a positioning device that can be used either to replace antiquated systems entirely or enhance the efficiency of a contemporary scanning system using antiquated turning elements. Still, what is needed is such a positioning device that is able to operate in cooperation with computerized scanning equipment and does not require excessive modifications to do so. Still further, what is needed is such a positioning device that includes both rotational and skewing capabilities, all while requiring relatively few mechanical parts. Yet still further, what is needed is such a positioning device which overcomes at least some of the disadvantages of the prior-art while providing new and useful pre-positioning, turning, and skewing features.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a new and improved, effective automated log pre-positioning and turning system that provides precision pre-positioning of raw logs and highly accurate turning of such logs along with skewing movement during sawmill processing. It is another objective of the present invention to provide such an automated log pre-positioning and turning system that utilizes computerized automation of sawmill operation during all stages including scanning, pre-positioning, cutting, and turning (with skewing) without human intervention. Thus, the preaent invention substantially eliminates human error and related waste of mill time and log resources. Another objective of the present invention is to provide such an automated log pre-positioning and turning system that entirely replaces antiqu<3ted systems or may be used in-part to replace antiquated turning elements so as to increase the efficiency of a contemporary scanning system still using such antiquated turning elements.
Still another objective of the present invention is to provide an automated log pre-positioning and turning system that delivers increased finesse in manipulation of raw logs while not interfering or jeopardizing other sawmill processes. Yet still another objective of the present invention to provide an automated log pre-positioning and turning system that operates in cooperation with computerized scanning equipment without requiring excessive modifications to do so. Such an automated log pre-positioning and turning system includes both rotational and skewing capabilities, yet requires few mechanical parts.
The present invention is directed to <~n automated log pre-positioning and turning system that includes a hydraulically actuated log manipulating mechanism with an integrated C-shaped element (hereinafter "positioning unit") useful for, but not limited to, sawmill purposes such as capturing, positioning, skewing, rotating, and transporting logs. In addition to the hydraulically actuated log manipulating mechanism with its positioning unit, the overall inventive system includes a stop and loader section, a conveyor section, a scanning section, a carriage section, and a sawing section. The stop and loader section provides a means for loading raw logs from a log deck one at a time into a pre-positioning area. Within the pre-positioning area, the conveyor section provides a means for conveying a log through a trough into a roller area. In the roller area, turning wheels rotate the log at least one complete rotation so that the scanning section can electronically scan the log. This electronic scanning functions to capture the log's dimensional information, calculate the optimal cutting solution for the given log, and output operational commands to the log manipulating mechanism, the carriage section, and the sawing section.
Moreover, after the log passes through the scanning area, the log manipulating mechanism is utilized to capture the log within the positioning unit.
In response to computer-generated operational commands derived from the scanning process, the log manipulating mechanism moves to secure the log within its positioning unit and rotate and skew the log to the log's predetermined best opening face (BOF). The BOF represents the initial lengthwise cut to the log that will optimize the quality and quantity of the resulting lumber. Once rotated and skewed to the BOF, the log is deposited onto the carriage section by the log manipulating mechanism. The carriage section includes multiple headblocks that hold the log onto a movable carriage. Each headblock moves in response to the given shape of the log. That is to say, the headblocks are actuated (e.g., hydraulically, electromechanically, ..etc.) in response to computer commands derived from the scanning process such that the multiple headblocks together conform to the given log shape. While the headblocks might be aligned identically for a very straight log, they may each be positioned drastically differently for a particularly crooked or knotty log.
The headblocks in the carriage section will maintain the log on the movable carriage. The movable carriage is movable in two directions and allows for multiple passes through the sawing section. The first direction moves the BOF (and subsequent cuts) past a bandsaw, or similar sawing device, in a back and forth motion along the length of the log. While the sawmill described herein is a carriage-type sawmill, it should be noted that any type of sawmill will benefit from the features of the present invention. A single pass results in a single cut of lumber from the log. After each pass, the movable carriage incrementally moves the open face of the log towards the bandsaw. This results in varying lumber thickness according to the given increment of movement. This is continued until the pre-determined point for log turning is reached. That pre-determined point having been calculated during the scanning process.
At that pre-determined point where all cuts on the first face (BOF and the successive cuts) have been made, the loc,~ manipulating mechanism will again capture the log and rotate the log by eith~ar a quarter turn (90°) or a half turn (180°). According, to the commands derived from the scanning process, additional skewing may or may not be necessary. Though it should be noted that it is possible to skew the log at any time while the log manipulating mechanism holds it. This becomes a critically useful feature when a raw log having a significant sweep is encountered. After such rotation (with or without skewing) to the second face to be cut, the log manipulating mechanism will re-deposit the log into the carriage section. Again, the headblocks will adjust to the changing shape of the cut log so as to secure the log for several passes into the sawing section.
This cutting, re-positioning, cutting process is repeated until all possible cuts have been made and all lumber acquired from the given log. At such point, a new log enters the system and is milled accordingly.
An important aspect of the present invention is that the next log to be milled may be deposited into the conveyor section and scanned while the last cutting passes are being made to the previous log. In this way, the log manipulating mechanism can deposit the next log onto the carriage section upon completion of the final cut of the previous log. This allows the immediate commencement of the cutting of the next log. This elimination of any required log adjustments on the movable carriage prior to cutting virtually keeps a tog constantly in the sawing section. This reprE~sents a substantial benefit over prior-art positioning systems and turning devices Overall, it should be understood that elements such as conveyors, rollers, carriages, bandsaws, electronic scanning equipment, computer controllers, hydraulic cylinders, electrical solenoids, wiring harnesses and electrical connection devices, and various related and similar devices may be used within the present invention. However, the specificity of such related and similar devices is a secondary consideration as compared to the primary features embodied in the present invention. That is to say, the log manipulating mechanism and its incorporation into and inter-relation to the inventive system as a whole is considered to embody that which is considered the invention.
Further, it should be readily apparent that many diffE:rent combinations of such related and similar devices may be utilized within the inventive system in cooperation with the log manipulating mechanism without straying from the intended scope of the present invention.
The invention will be described for the purposes of illustration only in connection with certain embodiments; however, it is to be understood that other objects and advantages of the present inv~sntion will be made apparent by the following description of the drawings according to the present invention.
While a preferred embodiment is disclosed, this is not intended to be limiting.
Rather, the general principles set forth herein are considered to be merely illustrative of the scope of the present invention and it is to be further understood that numerous changes may be made without straying from the scope of the present invention.
BRIEF DESCRIPTION OIF THE DRAWINGS
FIGURE 1 is a side view of the log manipulating mechanism and its C-shaped positioning unit according to the preferred embodiment of the present invention shown in operation with a carriage section and partially cut log.
FIGURE 2 is a top view of the inventive system showing multiple logs entering the system and one log within the positioning unit of the log manipulating mechanism that is shown in FIGURE 1.
FIGURE 3 is a side view of the log manipulating mechanism taken alone according to the preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is directed to a computerized log positioning system useful in a sawmill setting. The inventive system includes a novel log manipulating mechanism having a positioning unit. The log manipulating mechanism is preferably used in combination with an overall sawmill system that includes a stop and loader section, a conveyor section, a scanning section, a carriage section, and a sawing section. Although a carriage-type sawmill is preferred, the present invention can be adapted for use within any type of sawmill. Further, each section is fully computer controlled in a manner consistent with current technologies an interconnected through standard connecting devices - e.g., electrical wiring and cabling, hydraulic hosing and tubing, ...etc.).
More specifically, a system operator can oversee and override operation of the inventive system, but normal operation including log loading, scanning, positioning, and cutting are accomplished in response to computer generated commands. While a preferred configuration of the overall system will be shown in the drawings, this should be considered as a general preference for descriptive purposes. Accordingly, for illustrative clarity, the present invention will be described hereinbelow in specific detail only with respect to the novel log manipulating mechanism. All other system components being generally discussed only insofar as necessary to enable the utility of the log manipulating mechanism to one of ordinary skill in the sawmill art.
Referring now to FIGURE 1, therE; is shown a side view of the log manipulating mechanism 10 in accordance with the preferred embodiment of the present invention. The log manipulating mechanism 10 includes a positioning unit 12. The positioning unit 12 is preferably C-shaped and dimensioned so as to substantially surround logs sized for lumber uses (e.g., three foot diameter logs).
The positioning unit 12 is rotatably situated within the end of the log manipulating mechanism 10. A log 11 is shown having its BOF already cut. The log 11 is shown secured within a headblock 20. Tlhe headblock 20 includes a dogging mechanism 21 that clamps the log 11 down atop a movable carriage 22. The movable carriage 22 is able to move via wheels 22a and 22b along rails 23 and 24, respectively, in a direction parallel to the length of log 11. Movement along the rails 23, 24 is actuated by way of hydr<~ulics via a carriage traverse cylinder 25. Additionally, the movable carriage 22 is able to move in a direction perpendicular to the length of log 11 via a headblock cylinder 26. This dual movement of the movable carriage 22 will become more apparent with reference to FIGURE 2 below.
With continued reference to FIGURE 1, the log manipulating mechanism is seen to include a baseframe 30 that includes rails 31 (one hidden). Mounted to the baseframe 30 is a support 35. The support 35 is attached to the rails 31 via bearing mounts 32 and 33. A baseframe cylinder 34 is provided and attached between the baseframe 30 and support 35. The baseframe cylinder 34 is a hydraulic cylinder which, when activated, causes the support 35 to ride along the rails 31. Such movement by the log manipulating mechanism 10 is shown by dotted element 10a where it can be seen how the log manipulating mechanism 10 is able to fit beside the headblock 20 and movable carriage 22. This reveals how the positioning unit 12 is able to deposit the log 11 into the position as shown from the position shown by dotted lines 11a. Specific structure on the log manipulating mechanism 10 related to log positioning will be discussed later with respect to FIGURE 3.
With final reference to FIGURE 1, the support 35 of the log manipulating mechanism 10 includes a pivot mount 3.6. The main body 38 of the log manipulating mechanism 10 has a pivot 37 that connects to the pivot mount 36.
As steel or some relatedly durable alloy is. preferably used to fabricate the log manipulating mechanism, it becomes apparent that the forces acting upon the pivot 37 within the pivot mount 36 are grE:at. In order to facilitate raising and lowering the positioning unit 12 (and any giiven accompanying log held therein), the heavy steel main body 38 is held against pivoting movement via a lifting cylinder 40. The lifting cylinder 40 is mounted between the support 35 and the main body 38. Since most weight of thE~ log manipulating mechanism 10 is therefore taken up by the pivot mount 36. and the lifting cylinder 40, arcuate movement about the pivot 37 only requires the use of a fine positioning cylinder 39. Similar to the lifting cylinder 40, the fine positioning cylinder 39 is mounted between to support 35 and the main body 38. However, the fine positioning cylinder 39 is designed to react faster than the lifting cylinder 40 to effect small vertical adjustments of the main body 38 and thus adjustments of the grasped log (see 11 a).
FIGURE 2 is a top view of an automated precision log pre-positioning and log turning system 100 according to the ipreferred embodiment of the present invention. The system 100 shows the log manipulating mechanism 10 as seen in FIGURE 1 along with multiple headblocks 20, a log deck 50, a stop and load section 51, a conveyor section 52, a scanning section 53, a carriage section 54, a sawing section 55, and a control cab 56. It is preferred that the system 100 include at least the above-mentioned general elements 10, 20, and 50-56.
However, it should be understood that the specific type of headblocks 20, log deck 50, stop and load section 51, conveyor section 52, scanning section 53, carriage section 54, a sawing section 55, and control cab 56 may be altered without straying from the intended scope o~f the inventive system.
Accordingly, the following discussion of operation of the system 100 will be discussed in general terms with respect to elements 20 and 50-56 as such elements are sufficiently known in the sawmill art.
In operation, multiple logs 50a-50d are ushered along the log deck 50 (in the direction shown by directional arrows) towards the stop and load section 51.
The stop and load section 51 stops the rolling logs 50a-50d and loads each log one at a time onto the conveyor section 52. The conveyor section 52 operates in a manner similar to any conventional conveyor belt in order to move a log 50e into position within the scanning section 53. The scanning section includes a means for rolling the log 50e through .at least one complete turn (360°).
Preferably, a pair of rollers 53a and 53b are provided as such a means though any suitable roller trough may be used. Within the scanning section 53, there is included an electronic scanner (not shown) that will scan the entire log during the complete turn by rollers 53a and 53b. This provides a digital map of the given log 53e. The digital map is then utilized wuthin a computerized controller 56a to find the best cutting solution for the log including the BOF with which to begin cutting.
Using the best cutting solution, the controller 56a outputs commands to all actuators located throughout the system 100 to automatically: 1 ) position each log to its BOF upon the carriage section 541 via the log manipulating mechanism 10; 2) adjust each headblock 20 to accept the given uniquely-shaped log and secure it to the movable carriage 22; 3) pass the log face through the sawing section 55 and incrementally move the movable carriage 22 towards the cutting element during each pass; 4) re-position the log upon the carriage section 54 by a quarter turn (90°) or a half turn (180°) via the log manipulating mechanism 10;
and 5) repeat steps 3 and 4 until the log is completely sawn according to its best cutting solution. In order to further enhance continuous operation, the next log 50a will be scanned and pre-positioned within the log manipulating mechanism during the last passes of the previous Ic~g 50e through the sawing section 55.
It should be noted that all related wiring needed to allow the controller 56a to control the various actuators of the system '100 is of the type readily known in the 10 computer controller art and has been omitted for the sake of clarity.
While general components may b~e used within the system 100 for elements 20 and 50-56 within the functional constraints delineated above, the components of the log manipulating mechanism 10, and more particularly the positioning unit 12, will be discussed in specific detail with respect to FIGURE 3.
FIGURE 3 is a side view of the log rnanipulating mechanism 10 according to the preferred embodiment of the present invention. The log manipulating mechanism 10 includes the positioning unit 12 that is rotatable within the main body 38 of the log manipulating mechanism 10. Such rotation is accomplished via two drive chains 63 and 64 that are coupled together via a change-up gear 69. The drive chain 63 is looped around a series of pulleys 70-73. The pulleys are mounted to the main body 38 of the log manipulating mechanism 10.
Specifically, pulleys 70 and 71 are mounted via pulley supports 70a and 71a, respectively. Winding around pulleys 78 and 79 and along the outer circumference of the positioning unit 12, the drive chain 64 is affixed to the end tips of the C-shaped positioning unit 12. The ends of the other drive chain 63 are affixed to a link 75 that is, in turn, attached i:o a rod end 74 of a series of cylinders 60, 61, and 62. Cylinder 62 being secured to a cylinder mount 77 that is affixed to a cylinder support 76. The cylinder support 76 is affixed to the main body 38 of the log manipulating mechanism 10.
Upon actuation of any one of cylinders 60, 61, and 62, the rod end 74 will be linearly actuated and thereby move the drive chain 63. The drive chain 63 will then rotate the change-up gear 69, which then rotates the drive chain 64 and thus rotates the positioning unit 12. More specifically, actuation (i.e., expansion) of cylinder 60 will create a clockwise quarter turn (90°) of the positioning unit 12.
Actuation (i.e., expansion) of both cylinders 60 and 61 will together will create a clockwise half turn (180°) of the positioning unit 12. Actuation (i.e., retraction) of only cylinder 62 will create a counter-cllockwise quarter turn (-90°) of the positioning unit 12. Smooth rotational movement of the positioning unit 12 is assured via rollers 68 that are mounted on the main body 38 of the log manipulating mechanism 10 and peripherally spaced around the positioning unit 12. Such rotational movement provides rotation of any log placed within the positioning unit 12. Retention of such a log is accomplished via clamps 66a and 67a that are actuated, respectively, via clamp cylinders 66 and 67. Such actuation of clamp cylinders 66 and 67 functions to retract clamps 66a and 67a as can be seen via the dotted lines of retracted clamps 66a' and 67a'.
While rotational movement of any clamped-in log is apparent by the discussion above, the skewing movement is best described with reference to both FIGURES 2 and 3. In FIGURE 2, skewing cylinders 65 and 65' are shown. Each skewing cylinder 65 and 65' operates independent of one another. In FIGURE 3, it is seen that each skewing cylinder (only 65 is visible) operates a skewing plate 65a. By activating either skewing cylinder 65 or 65', the related skewing plate will push the log in a manner so as to skew the log. This skewing movement combined with the vertical movement of thE~ fine positioning cylinder 39 and the rotational movement derived from one or more of cylinders 60, 61, and 62 creates a multitude of positional movements. Further, each of the skewing cylinders 65, 65', the fine positioning cylinder 39, and the cylinders 60, 61, and 62 for rotational movement are operated automatically via the controller 56a in response to the pre-determined commands created during scanning. This results in a fast and accurate positioning of a log during sawmill operations.
It should be understood that the preferred embodiment mentioned here is merely illustrative of the present invention. Numerous variations in design and use of the present invention may be contemplated in view of the following claims without straying from the intended scopE~ and field of the invention herein disclosed.
While a preferred embodiment is disclosed, this is not intended to be limiting.
Rather, the general principles set forth herein are considered to be merely illustrative of the scope of the present invention and it is to be further understood that numerous changes may be made without straying from the scope of the present invention.
BRIEF DESCRIPTION OIF THE DRAWINGS
FIGURE 1 is a side view of the log manipulating mechanism and its C-shaped positioning unit according to the preferred embodiment of the present invention shown in operation with a carriage section and partially cut log.
FIGURE 2 is a top view of the inventive system showing multiple logs entering the system and one log within the positioning unit of the log manipulating mechanism that is shown in FIGURE 1.
FIGURE 3 is a side view of the log manipulating mechanism taken alone according to the preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is directed to a computerized log positioning system useful in a sawmill setting. The inventive system includes a novel log manipulating mechanism having a positioning unit. The log manipulating mechanism is preferably used in combination with an overall sawmill system that includes a stop and loader section, a conveyor section, a scanning section, a carriage section, and a sawing section. Although a carriage-type sawmill is preferred, the present invention can be adapted for use within any type of sawmill. Further, each section is fully computer controlled in a manner consistent with current technologies an interconnected through standard connecting devices - e.g., electrical wiring and cabling, hydraulic hosing and tubing, ...etc.).
More specifically, a system operator can oversee and override operation of the inventive system, but normal operation including log loading, scanning, positioning, and cutting are accomplished in response to computer generated commands. While a preferred configuration of the overall system will be shown in the drawings, this should be considered as a general preference for descriptive purposes. Accordingly, for illustrative clarity, the present invention will be described hereinbelow in specific detail only with respect to the novel log manipulating mechanism. All other system components being generally discussed only insofar as necessary to enable the utility of the log manipulating mechanism to one of ordinary skill in the sawmill art.
Referring now to FIGURE 1, therE; is shown a side view of the log manipulating mechanism 10 in accordance with the preferred embodiment of the present invention. The log manipulating mechanism 10 includes a positioning unit 12. The positioning unit 12 is preferably C-shaped and dimensioned so as to substantially surround logs sized for lumber uses (e.g., three foot diameter logs).
The positioning unit 12 is rotatably situated within the end of the log manipulating mechanism 10. A log 11 is shown having its BOF already cut. The log 11 is shown secured within a headblock 20. Tlhe headblock 20 includes a dogging mechanism 21 that clamps the log 11 down atop a movable carriage 22. The movable carriage 22 is able to move via wheels 22a and 22b along rails 23 and 24, respectively, in a direction parallel to the length of log 11. Movement along the rails 23, 24 is actuated by way of hydr<~ulics via a carriage traverse cylinder 25. Additionally, the movable carriage 22 is able to move in a direction perpendicular to the length of log 11 via a headblock cylinder 26. This dual movement of the movable carriage 22 will become more apparent with reference to FIGURE 2 below.
With continued reference to FIGURE 1, the log manipulating mechanism is seen to include a baseframe 30 that includes rails 31 (one hidden). Mounted to the baseframe 30 is a support 35. The support 35 is attached to the rails 31 via bearing mounts 32 and 33. A baseframe cylinder 34 is provided and attached between the baseframe 30 and support 35. The baseframe cylinder 34 is a hydraulic cylinder which, when activated, causes the support 35 to ride along the rails 31. Such movement by the log manipulating mechanism 10 is shown by dotted element 10a where it can be seen how the log manipulating mechanism 10 is able to fit beside the headblock 20 and movable carriage 22. This reveals how the positioning unit 12 is able to deposit the log 11 into the position as shown from the position shown by dotted lines 11a. Specific structure on the log manipulating mechanism 10 related to log positioning will be discussed later with respect to FIGURE 3.
With final reference to FIGURE 1, the support 35 of the log manipulating mechanism 10 includes a pivot mount 3.6. The main body 38 of the log manipulating mechanism 10 has a pivot 37 that connects to the pivot mount 36.
As steel or some relatedly durable alloy is. preferably used to fabricate the log manipulating mechanism, it becomes apparent that the forces acting upon the pivot 37 within the pivot mount 36 are grE:at. In order to facilitate raising and lowering the positioning unit 12 (and any giiven accompanying log held therein), the heavy steel main body 38 is held against pivoting movement via a lifting cylinder 40. The lifting cylinder 40 is mounted between the support 35 and the main body 38. Since most weight of thE~ log manipulating mechanism 10 is therefore taken up by the pivot mount 36. and the lifting cylinder 40, arcuate movement about the pivot 37 only requires the use of a fine positioning cylinder 39. Similar to the lifting cylinder 40, the fine positioning cylinder 39 is mounted between to support 35 and the main body 38. However, the fine positioning cylinder 39 is designed to react faster than the lifting cylinder 40 to effect small vertical adjustments of the main body 38 and thus adjustments of the grasped log (see 11 a).
FIGURE 2 is a top view of an automated precision log pre-positioning and log turning system 100 according to the ipreferred embodiment of the present invention. The system 100 shows the log manipulating mechanism 10 as seen in FIGURE 1 along with multiple headblocks 20, a log deck 50, a stop and load section 51, a conveyor section 52, a scanning section 53, a carriage section 54, a sawing section 55, and a control cab 56. It is preferred that the system 100 include at least the above-mentioned general elements 10, 20, and 50-56.
However, it should be understood that the specific type of headblocks 20, log deck 50, stop and load section 51, conveyor section 52, scanning section 53, carriage section 54, a sawing section 55, and control cab 56 may be altered without straying from the intended scope o~f the inventive system.
Accordingly, the following discussion of operation of the system 100 will be discussed in general terms with respect to elements 20 and 50-56 as such elements are sufficiently known in the sawmill art.
In operation, multiple logs 50a-50d are ushered along the log deck 50 (in the direction shown by directional arrows) towards the stop and load section 51.
The stop and load section 51 stops the rolling logs 50a-50d and loads each log one at a time onto the conveyor section 52. The conveyor section 52 operates in a manner similar to any conventional conveyor belt in order to move a log 50e into position within the scanning section 53. The scanning section includes a means for rolling the log 50e through .at least one complete turn (360°).
Preferably, a pair of rollers 53a and 53b are provided as such a means though any suitable roller trough may be used. Within the scanning section 53, there is included an electronic scanner (not shown) that will scan the entire log during the complete turn by rollers 53a and 53b. This provides a digital map of the given log 53e. The digital map is then utilized wuthin a computerized controller 56a to find the best cutting solution for the log including the BOF with which to begin cutting.
Using the best cutting solution, the controller 56a outputs commands to all actuators located throughout the system 100 to automatically: 1 ) position each log to its BOF upon the carriage section 541 via the log manipulating mechanism 10; 2) adjust each headblock 20 to accept the given uniquely-shaped log and secure it to the movable carriage 22; 3) pass the log face through the sawing section 55 and incrementally move the movable carriage 22 towards the cutting element during each pass; 4) re-position the log upon the carriage section 54 by a quarter turn (90°) or a half turn (180°) via the log manipulating mechanism 10;
and 5) repeat steps 3 and 4 until the log is completely sawn according to its best cutting solution. In order to further enhance continuous operation, the next log 50a will be scanned and pre-positioned within the log manipulating mechanism during the last passes of the previous Ic~g 50e through the sawing section 55.
It should be noted that all related wiring needed to allow the controller 56a to control the various actuators of the system '100 is of the type readily known in the 10 computer controller art and has been omitted for the sake of clarity.
While general components may b~e used within the system 100 for elements 20 and 50-56 within the functional constraints delineated above, the components of the log manipulating mechanism 10, and more particularly the positioning unit 12, will be discussed in specific detail with respect to FIGURE 3.
FIGURE 3 is a side view of the log rnanipulating mechanism 10 according to the preferred embodiment of the present invention. The log manipulating mechanism 10 includes the positioning unit 12 that is rotatable within the main body 38 of the log manipulating mechanism 10. Such rotation is accomplished via two drive chains 63 and 64 that are coupled together via a change-up gear 69. The drive chain 63 is looped around a series of pulleys 70-73. The pulleys are mounted to the main body 38 of the log manipulating mechanism 10.
Specifically, pulleys 70 and 71 are mounted via pulley supports 70a and 71a, respectively. Winding around pulleys 78 and 79 and along the outer circumference of the positioning unit 12, the drive chain 64 is affixed to the end tips of the C-shaped positioning unit 12. The ends of the other drive chain 63 are affixed to a link 75 that is, in turn, attached i:o a rod end 74 of a series of cylinders 60, 61, and 62. Cylinder 62 being secured to a cylinder mount 77 that is affixed to a cylinder support 76. The cylinder support 76 is affixed to the main body 38 of the log manipulating mechanism 10.
Upon actuation of any one of cylinders 60, 61, and 62, the rod end 74 will be linearly actuated and thereby move the drive chain 63. The drive chain 63 will then rotate the change-up gear 69, which then rotates the drive chain 64 and thus rotates the positioning unit 12. More specifically, actuation (i.e., expansion) of cylinder 60 will create a clockwise quarter turn (90°) of the positioning unit 12.
Actuation (i.e., expansion) of both cylinders 60 and 61 will together will create a clockwise half turn (180°) of the positioning unit 12. Actuation (i.e., retraction) of only cylinder 62 will create a counter-cllockwise quarter turn (-90°) of the positioning unit 12. Smooth rotational movement of the positioning unit 12 is assured via rollers 68 that are mounted on the main body 38 of the log manipulating mechanism 10 and peripherally spaced around the positioning unit 12. Such rotational movement provides rotation of any log placed within the positioning unit 12. Retention of such a log is accomplished via clamps 66a and 67a that are actuated, respectively, via clamp cylinders 66 and 67. Such actuation of clamp cylinders 66 and 67 functions to retract clamps 66a and 67a as can be seen via the dotted lines of retracted clamps 66a' and 67a'.
While rotational movement of any clamped-in log is apparent by the discussion above, the skewing movement is best described with reference to both FIGURES 2 and 3. In FIGURE 2, skewing cylinders 65 and 65' are shown. Each skewing cylinder 65 and 65' operates independent of one another. In FIGURE 3, it is seen that each skewing cylinder (only 65 is visible) operates a skewing plate 65a. By activating either skewing cylinder 65 or 65', the related skewing plate will push the log in a manner so as to skew the log. This skewing movement combined with the vertical movement of thE~ fine positioning cylinder 39 and the rotational movement derived from one or more of cylinders 60, 61, and 62 creates a multitude of positional movements. Further, each of the skewing cylinders 65, 65', the fine positioning cylinder 39, and the cylinders 60, 61, and 62 for rotational movement are operated automatically via the controller 56a in response to the pre-determined commands created during scanning. This results in a fast and accurate positioning of a log during sawmill operations.
It should be understood that the preferred embodiment mentioned here is merely illustrative of the present invention. Numerous variations in design and use of the present invention may be contemplated in view of the following claims without straying from the intended scopE~ and field of the invention herein disclosed.
Claims (12)
1. An automated log pre-positioning and turning system for use within a sawmill, said system comprising:
a log deck for providing entry of logs into said system;
a stop and load section for limiting said entry of logs into said system to a single one of said logs;
a conveyor section for receiving said single one of said logs, a scanning section for electronically recording a best cutting solution of said single one of said logs;
a log manipulating mechanism for positioning said single one of said logs according to said best cutting solution;
a carriage section for receiving said single one of said logs from said log manipulating mechanism;
a sawing section for cutting said single one of said logs; and a computer controller for automatically operating said stop and load section, said conveyor section, said scanning section, said log manipulating mechanism, said carriage section, and said sawing section.
a log deck for providing entry of logs into said system;
a stop and load section for limiting said entry of logs into said system to a single one of said logs;
a conveyor section for receiving said single one of said logs, a scanning section for electronically recording a best cutting solution of said single one of said logs;
a log manipulating mechanism for positioning said single one of said logs according to said best cutting solution;
a carriage section for receiving said single one of said logs from said log manipulating mechanism;
a sawing section for cutting said single one of said logs; and a computer controller for automatically operating said stop and load section, said conveyor section, said scanning section, said log manipulating mechanism, said carriage section, and said sawing section.
2. The system as claimed in Claim 1, wherein said log manipulating mechanism, said carriage section, and said sawing section automatically function in response to output commands of said computer controller, said output commands being derived from said best cutting solution.
3. The system as claimed in Claim 2, wherein said log manipulating mechanism and said carriage section include a plurality of actuators, each said actuator operating in response to said output commands of said computer controller.
4. The system as claimed in Claim 3, wherein said plurality of actuators are hydraulic pistons.
5. The system as claimed in Claim 4, wherein said log manipulating mechanism includes a C-shaped positioning unit for holding said single one of said logs securely therein.
6. The system as claimed in Claim 5, wherein said log manipulating mechanism includes a lifting actuator for vertical movement of said positioning unit, a series of linear actuators for rotational movement of said positioning unit, and at least two side-mounted actuators, said at least two side-mounted actuators designed for skewing movement of said single one of said logs located securely within said positioning unit.
7. The system as claimed in Claim 6, wherein said positioning unit includes two clamps that are able to be actuated so as to retain said single one of said logs securely therein.
8. A log manipulating mechanism for use within an automated log pre-positioning and turning system having a log deck, a stop and load section, a conveyor section, a scanning section, a carriage section, a sawing section, and a computer controller for automatically operating said stop and load section, said conveyor section, said scanning section, said log manipulating mechanism, said carriage section, and said sawing section, said log manipulating mechanism comprising:
a plurality of actuators, each said actuator automatically operating in response to output commands of a computer controller, said output commands being derived from a scanning section that electronically records a best cutting solution of a log being milled wherein said log manipulating mechanism by way of said plurality of actuators is able to rotate said log, raise said log, lower said log, and longitudinally skew said log.
a plurality of actuators, each said actuator automatically operating in response to output commands of a computer controller, said output commands being derived from a scanning section that electronically records a best cutting solution of a log being milled wherein said log manipulating mechanism by way of said plurality of actuators is able to rotate said log, raise said log, lower said log, and longitudinally skew said log.
9. The log manipulating mechanism as claimed in Claim 8, wherein said plurality of actuators are hydraulic pistons.
10. The log manipulating mechanism as claimed in Claim 9, wherein said log manipulating mechanism includes a C-shaped positioning unit for holding said log securely therein.
11. The log manipulating mechanism as claimed in Claim 10, wherein said plurality of actuators includes a lifting actuator for vertical movement of said positioning unit, a series of linear actuators for rotational movement of said positioning unit, and at least two side-mounted actuators, said at least two side-mounted actuators designed for skewing movement of said log located securely within said positioning unit.
12. The log manipulating mechanism as claimed in Claim 11, wherein said positioning unit includes two clamps, each said clamps including a clamp actuator such that upon activation of said clamp actuator said log is unable to be removed from said positioning unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28793999A | 1999-04-07 | 1999-04-07 | |
| US09/287,939 | 1999-04-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2271609A1 true CA2271609A1 (en) | 2000-10-07 |
Family
ID=29711763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2271609 Abandoned CA2271609A1 (en) | 1999-04-07 | 1999-05-13 | Automated precision log pre-positioning and log turning system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2271609A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3524388A1 (en) * | 2005-03-17 | 2019-08-14 | Usnr, Llc | Controller for controlling a log rotator and log rotator system comprising such a controller |
-
1999
- 1999-05-13 CA CA 2271609 patent/CA2271609A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3524388A1 (en) * | 2005-03-17 | 2019-08-14 | Usnr, Llc | Controller for controlling a log rotator and log rotator system comprising such a controller |
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