Device for initializing an automated warehousing system

• US 5,056,437 A
• Filed: 05/15/1990
• Issued: 10/15/1991
• Est. Priority Date: 05/15/1990
• Status: Expired due to Fees

• Current Assignee: Republic Storage Systems Company Incorporated
• Original Assignee: Republic Storage Systems Company Incorporated
• Inventors: Maddock, John C.
• Primary Examiner(s): Oberleitner, Robert J.
• Assistant Examiner(s): Le, Mark T.
• Application Number:
  US07/524,216
• Time in Patent Office: 518 Days
• Field of Search: 104/88, 364/424.01, 364/424.02, 364/444, 364/447, 364/456, 364/449, 414/273, 414/274, 414/275, 180/167, 180/168, 180/169, 340/686, 356/152, 356/141
• US Class Current: 104/88.03
• CPC Class Codes: B25J 9/1692 Calibration of manipulator
• CPC Class Codes: B65G 1/0421 with control for stacker crane operations
• CPC Class Codes: B66F 9/0755 Position control; Position detectors

Abstract

A new and useful device for initializing an automated warehouse system when the system is in its "power-up" mode. The device of the invention initializes the system at "power-up" by sensing the midpoint of a specially formed gap between two strips of retroreflective tape, and establishing the midpoint of that gap as the floating, zero offset, reference point for the system.

Claims

1. An automated warehouse/staging system comprising a series of stations, a track extending along at least a portion of the stations, and a carriage moveable along said track for registration with the portion of said stations;

said system having a power-up mode when power is initially delivered to the system;

initializing means operative during said powerup mode for establishing a reference point against which movement of said carriage along said track is controlled, said initializing means comprising a pair of strips of retroreflective material located in series along said track with a gap located therebetween, and means for (a) sensing both the leading and trailing edges of the gap, (b) measuring the gap, (c) locating the midpoint of the gap, (d) establishing the midpoint as the reference point against which movement of the carriage along the track is controlled.

2. An automated warehouse/staging system as defined in claim 1, wherein said initializing means comprises sensing means for sensing the presence of said strips of retroreflective material as said carriage moves along said track, said sensing means being adapted to sequentially sense (i) a first one of said pair of strips, (ii) the leading and trailing edges of said gap, and (iii) the second of said pair of strips as said carriage moves in a first direction along said track.

3. An automated warehouse/staging system as set forth in claim 2, wherein said system has a default mode at power-up, the default mode being adapted at power-up to cause the carriage to move in said first direction along said track.

4. An automated warehouse/staging system as defined in claim 3, wherein said system includes a TAPE OFF zone adjacent to said first strip, said default mode being adapted to cause the carriage and the sensing means to move from the TAPE OFF zone in said first direction to cause said initializing means to establish said reference point.

5. An automated warehouse/staging system as defined in claim 4, wherein said default mode is adapted when the sensing means is located on either of said pair of strips or on the gap at power-up to cause the carriage and the sensing means to move to the TAPE OFF zone and then in the first direction to enable said initialization means to establish said reference point.

6. An automated warehouse/staging system as defined in any of claims 2-5, wherein said sensing means is adapted to sense the leading and trailing edges of each of said pair of strips, said initializing means being adapted to cause the carriage to begin to slow when said sensing means senses the leading edge of said first strip and to cause the carriage to stop prior to the time the sensing means senses the trailing edge of said second strip.

7. An automated warehouse/staging system as defined in claim 6, wherein said first one of said pair of strips has a length of about one inch, said gap has a length of about one inch, and said second of said pair of strips has a length of about 60 inches.

8. An automated warehouse/staging system as defined in claim 7, wherein said stations include horizontally spaced columns of bin locations, each column having a plurality of vertically spaced bin locations, said track extending horizontally along said columns of bin locations.