Mechanically intelligent end-of-arm tool
A mechanically intelligent end-of-arm tool includes a valve that is actuated by the action of the arm, such that a force applied to the object to be grasped opens the valve to expose a suction cup to the vacuum pressure. A spool valve, poppet valve, and butterfly valve, et al., can perform the valve function. The tool may include a button that has a rigid contact surface or may be deformable to provide a smoothing force to the object.
1. A spool valve assembly, comprising:
a housing defining apertures;
a spool assembly at least partly within and moveable within the housing, the spool assembly including:
a hollow piston including a shaft wall defining ports formed therethrough, the hollow piston being biased to a rest position;
a seal formed between the piston shaft wall and the housing when the hollow piston is in the rest position, the seal configured to block air flow between the housing apertures and the shaft wall ports; and
a button forming a bottom face of the housing; and
a suction cup having a sidewall positioned circumferentially around the button,
wherein the hollow piston is configured to be displaceable, against the bias, in response to a force applied through the button, thereby enabling air flow between the housing apertures and the shaft wall ports.
2. The spool valve assembly of claim 1 , wherein:
the seal is an upper seal,
the spool valve assembly further comprises a lower seal formed on the piston shaft wall, and
when the hollow piston is in the rest position, the lower seal is located below the shaft wall ports and the upper seal is located above the shaft wall ports.
3. The spool valve assembly of claim 1 , further comprising a spring that biases the hollow piston toward the rest position.
4. The spool valve assembly of claim 3 , wherein the housing includes a top plate, the spring engaging the top plate.
5. The spool valve assembly of claim 2 , wherein the shaft wall further defines lower apertures that are located below the lower seal.
6. The spool valve assembly of claim 1 , wherein the suction cup is at least one of a bellows or a vacuum cup.
7. The spool valve assembly of claim 1 , wherein the button has a planar contact face.
8. The spool valve assembly of claim 7 , wherein the button includes oriented fingers that are configured to, in response to the force applied through the button upon engagement with a planar label of a package, move radially outwardly over the planar label.
9. A tool configured to engage an object, the tool comprising:
a housing defining a plenum and a vacuum inlet configured to provide vacuum to the plenum;
a valve assembly including an inlet open to ambient air, an outlet in fluid communication with the plenum, an actuator, and a valve that is biased toward a rest position in which the valve blocks air flow between the inlet and the outlet; and
a suction cup having a sidewall positioned circumferentially around the valve inlet, the suction cup mounted to at least one of the housing or the valve assembly,
wherein the actuator is configured to be displaceable relative to housing, against the bias and in response to the valve assembly engaging an object, thereby enabling air flow between the inlet and the outlet, and
wherein the tool is configured to apply a force to an item and/or label of a package, upon engagement of the tool with the package, before application of vacuum pressure through the suction cup.
10. The tool of claim 9 , wherein the actuator comprises a spring configured to bias the valve toward the rest position.
11. The tool of claim 9 , wherein the valve assembly is a poppet valve, the poppet valve including:
a body, wherein the inlet and the outlet are formed in the body;
a seal plate that, when the poppet valve is in the rest position seals the outlet to block air flow;
a poppet shaft coupled to the seal plate;
a button coupled to the poppet shaft opposite the seal plate; and
a spring configured to bias the seal plate toward a closed position.
12. The tool of claim 9 , wherein the valve assembly is a butterfly valve assembly, the butterfly valve including:
a valve body;
a pivotable plate in the valve body that is closed when the butterfly valve is in the rest position;
a sleeve that is moveable relative to the valve body; and
a link coupled between the sleeve and the pivotable plate, whereby movement between the sleeve and valve body actuates the pivotable plate.
13. The tool of claim 12 , wherein the actuator is the sleeve, the outlet is formed by the valve body, and the inlet is formed by the sleeve.
14. The tool of claim 10 , further comprising a second valve assembly, the valve assembly having a spring force and/or force profile that is different than a spring force and/or force profile of the second valve assembly.
15. A spool valve assembly, comprising:
a housing defining apertures;
a spool assembly at least partly within and moveable within the housing, the spool assembly including:
a hollow piston including a shaft wall defining ports formed therethrough, the hollow piston being biased to a rest position;
at least one seal formed between the piston shaft wall and the housing when the hollow piston is in the rest position, the at least one seal configured to block air flow between the housing apertures and the shaft wall ports; and
a button having a planar bottom contact face; and
a suction cup positioned about the button,
wherein the hollow piston is configured to be displaceable, against the bias, in response to a force applied through the button, thereby enabling air flow between the housing apertures and the shaft wall ports, and
wherein the button includes oriented fingers that are configured to, in response to the force applied through the button upon engagement with a package, move radially outwardly over the package.
16. The spool valve assembly of claim 1 , wherein the sidewall of the suction cup circumferentially surrounds an entirety of a perimeter of the button.
17. The spool valve assembly of claim 1 , wherein displacement of the hollow piston aligns the sleeve housing apertures and the shaft wall ports, thereby enabling air flow between the sleeve housing apertures and the shaft wall ports.
18. The spool valve assembly of claim 1 , wherein the seal is an o-ring.
19. The spool valve assembly of claim 1 , wherein the suction cup and the hollow piston are concentric.
20. The tool of claim 9 , wherein the sidewall of the suction cup circumferentially surrounds an entirety of a perimeter of the valve inlet.