Interaction points of an object
View Patent ↗This application describes a spatial envelope defining interaction of a robot arm and a fixture. The spatial envelope has a “keep-out” envelope defining a volume that the robot arm shall avoid entering, an input location defining a volume where the robot arm is to place a first object, an output location defining a volume from which the robot arm is to remove a second object, and a plurality of target items.
1. A spatial envelope defining interaction of a robot arm and a fixture, comprising:
a “keep-out” envelope defining a volume that the robot arm shall avoid entering, wherein the fixture is completely contained within the keep-out envelope;
an input location defining a volume where the robot arm is to place a first object;
an output location defining a volume from which the robot arm is to remove a second object; and
a plurality of target items fixedly coupled to the fixture.
2. The spatial envelope of claim 1 , wherein:
the spatial envelope further comprises a local first coordinate system;
the location of each of the plurality of target items is defined in the first coordinate system; and
the boundaries of one or more of the keep-out envelope, the input location, and the output location are defined in the first coordinate system.
3. The spatial envelope of claim 2 , wherein information about one or more of the locations of the plurality of target items and the boundaries of keep-out envelope, the input location, and the output location are stored in a memory associated with the fixture.
4. The spatial envelope of claim 3 , wherein a portion of the information may be downloaded from the memory into a processor controlling the robot arm.
5. The spatial envelope of claim 4 , wherein:
the first coordinate system has a first position and a first orientation defined in a global second coordinate system; and
a second position and a second orientation of the robot arm may be defined in the second coordinate system, thus establishing the relative position and relative orientation of the fixture with respect to the robot arm and enabling the processor to control the robot arm so as to interact with the fixture.
6. The spatial envelope of claim 2 , wherein the location of each of the plurality of target items is chosen such that at least 3 of the target items are visible from a single viewpoint within defined ranges of the first position and the first orientation.
7. The spatial envelope of claim 6 , wherein the viewpoint has a third position defined in the second coordinate system.
8. The spatial envelope of claim 2 , wherein at least one of the plurality of target items is a fiducial.
9. The spatial envelope of claim 1 , wherein the second object is the first object that has been processed in some fashion.