Apparatus and method of distributed object handling

• US 6,577,925 B1
• Filed: 11/24/1999
• Issued: 06/10/2003
• Est. Priority Date: 11/24/1999
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Fromherz, Markus P. J.
• Primary Examiner(s): Von Buhr, Maria N.
• Application Number:
  US09/449,340
• Time in Patent Office: 1,294 Days
• Field of Search: 700/117, 700/97, 700/103, 700/258, 700/213, 700/228-229, 700/250-255, 700/262-264, 701/200-202, 701/300-302, 198/341.05, 198/502.3
• US Class Current: 700/255
• CPC Class Codes: B65H 2220/01 indicating an entity as a function of which control, adjustment or change is performed, i.e. input
• CPC Class Codes: B65H 2220/03 indicating an entity which is measured, estimated, evaluated, calculated or determined but which does not constitute an entity which is adjusted or changed by the control process per se
• CPC Class Codes: B65H 2301/4452 Regulating space between separated articles
• CPC Class Codes: B65H 2511/414 of mode of operation
• CPC Class Codes: B65H 2513/40 Movement
• CPC Class Codes: B65H 43/00 Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable

Abstract

A modular object handling system has a multi-level control architecture, which includes a system controller that coordinates the functions and/or operations of individual module controllers, that in turn control corresponding actuators, to provide a desired system function. The system controller performs the overall trajectory planning by taking the constraints of each of the module actuators into account. The system controller may compensate for deviations of objects from their planned trajectories by contemporaneously redetermining trajectories and trajectory envelopes to encode the various combinations of the system constraints and task requirements. The trajectory envelopes can denote regions around other trajectories to indicate control criteria of interest, such as control and collision boundaries. However, by predetermining the trajectories and trajectory envelopes, and comparing the current state of an object with the predetermined trajectory envelopes, the system controller can even more quickly determine the extent to which the state satisfies the criteria. Thus, this system simplifies on-line determinations to merely include a comparison between a particular object, a particular trajectory and the corresponding trajectory envelope. It is also desirable to predetermine trajectories and trajectory envelopes by explicitly representing the system constraints and/or task requirements. By explicitly representing the system constraints and/or task requirements, the trajectories and trajectory envelopes can be automatically predetermined when adding new constraints to an existing system, or upon creating a new system once the arrangement of module actuators is known.

Claims

1. A method of determining trajectories for recording media object handling, comprising:

specifying a system model of a media handling apparatus;

specifying at least one of explicitly represented system constraints and explicitly represented task requirements of the media handling apparatus; and

determining a specified trajectory in a trajectory space for a specified recording media object to accomplish a system function based on the specified system model and the specified ones of the explicitly represented system constraints and task requirements,

the explicitly represented task requirements corresponding to one or more media handling apparatus tasks of;

moving the recording media object through the media handling apparatus, inverting the recording media object through the media handling apparatus, decurling the recording media object, transferring an image on the recording media object, and fusing an image on the recording media object.

2. The method according to claim 1, wherein determining the specified trajectory includes determining a nominal trajectory.

3. The method according to claim 2, further including determining a nominal trajectory in a trajectory space of a recording media object that is behind the recording media object in a path based upon the specified system model and the specified ones of the explicitly represented system constraints and task requirements.

4. The method according to claim 2, further including determining a nominal trajectory in a trajectory space of a recording media object that is ahead of the recording media object in a path based upon the specified system model and the specified ones of the explicitly represented system constraints and task requirements.

5. The method according to claim 1, further including determining a trajectory envelope in a trajectory space usable with the specified trajectory to indicate at least one criterion of interest.

6. The method according to claim 5, wherein determining the trajectory envelope includes determining the trajectory envelope based on the specified system model and the specified ones of the explicitly represented system constraints and task requirements.

7. The method according to claim 5, wherein determining the trajectory envelope includes determining a control envelope.

8. The method according to claim 7, wherein determining the control envelope includes determining the control envelope based on constraints that relate to the specified trajectory.

9. The method according to claim 8, wherein determining the control envelope based on constraints that relate to the specified trajectory includes determining a control envelope that ends at the same time and location in a trajectory space as the specified trajectory.

10. The method according to claim 5, wherein determining the trajectory envelope includes determining a collision envelope.

11. The method according to claim 10, wherein determining the collision envelope includes determining the collision envelope based on constraints that relate to the specified trajectory.

12. The method according to claim 11, wherein determining the collision envelope based on constraints that relate to the specified trajectory includes determining a collision envelope that begins at the same time and location in a trajectory space as the specified trajectory of the recording media object.

13. The method according to claim 11, wherein determining the collision envelope based on constraints that relate to the specified trajectory includes determining a collision envelope that ends at the same time and location in a trajectory space as a trajectory of a trailing edge of another recording media object.

14. The method according to claim 1, wherein determining a specified trajectory includes predetermining a specified trajectory.

15. The method according to claim 1, further including determining multiple trajectory envelopes in a trajectory space usable with the specified trajectory to indicate different control criteria of interest.

16. An apparatus that determines trajectories of recording media objects that are movable along a path of a media handling system, the apparatus comprising:

a device that determines a specified trajectory in a trajectory space for a specified recording media object to accomplish a system function of the media handling system based on a specified system model of the media handling system and at least one of at least one specified explicitly represented system constraint of the media handling system and at least one specified explicitly represented task requirement of the media handling system,

the at least one specified explicitly represented task requirement corresponding to one or more media handling apparatus tasks of;

moving the recording media object through the media handling apparatus, inverting the recording media object through the media handling apparatus, decurling the recording media object, transferring an image on the recording media object, and fusing an image on the recording media object.

17. The apparatus according to claim 16, wherein the device determines a normal trajectory in a trajectory space for the specified recording media object.

18. The apparatus according to claim 16, wherein the device determines a trajectory envelope in a trajectory space usable with the specified trajectory to indicate at least one control criterion of interest.

19. The apparatus according to claim 18, wherein the device determines the trajectory envelope based on the specified system model and the at least one of the at least one specified explicitly represented system constraints and the at least one specified explicitly represented task requirements.

20. The apparatus according to claim 16, wherein the device determines a nominal trajectory in a trajectory space of a recording media object that is behind the specified recording media object in the path based upon the specified system model and the at least one of the at least one specified explicitly represented system constraints and the at least one specified explicitly represented task requirements.

21. The apparatus according to claim 16, wherein the device determines a nominal trajectory in a trajectory space of a recording media object that is ahead of the specified recording media object in the path based upon the specified system model and the specified at least one of the at least one explicitly represented system constraints and the at least one specified explicitly represented task requirements.

22. The apparatus according to claim 16, wherein the device includes at least one system controller of the media handling system.

23. The apparatus according to claim 16, wherein the device includes at least one modular controller of the media handling system.

24. The apparatus according to claim 23, wherein the device includes a plurality of modular controllers of the media handling system.