CONTROL METHOD FOR MOVING RACKS
First Claim
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1. A method of controlling the movement of a moveable partition having at least a pair of transversely spaced, ground engaging drive elements for moving the partition along a parallel path, said method comprising the steps of sensing the path of movement of the partition and controlling the drive elements to maintain a parallel path of movement.
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Abstract
Several embodiments of moveable partitions and controls that permit smooth operation and parallel movement even when they are trackless and that provide safety in operation in avoiding encounters with unexpected objects without unnecessarily stopping the operation when an object is not actually there.
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22 Claims
- 1. A method of controlling the movement of a moveable partition having at least a pair of transversely spaced, ground engaging drive elements for moving the partition along a parallel path, said method comprising the steps of sensing the path of movement of the partition and controlling the drive elements to maintain a parallel path of movement.
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6. A method of controlling the movement of a moveable partition having at least a pair of transversely spaced, ground engaging drive elements for moving the partition along a parallel path, said method comprising the steps of sensing optically when an object moves into the path of movement of the partition and separately controlling the drive elements in response to an apparent detection to shift the partition to see if the detection was an error caused by the orientation of the partition and if the condition still exists after a predetermined correction the movement of the partition is halted.
- 7. A moveable partition having at least a pair of transversely spaced, ground engaging drive elements for moving said partition along a parallel path, a sensor for sensing the path of movement of the partition and a control responsive to the output of said sensor to differently operate said drive elements to maintain a parallel path of movement.
Specification