Method and apparatus for inspecting electrical wire

• US 5,050,093 A
• Filed: 10/19/1989
• Issued: 09/17/1991
• Est. Priority Date: 10/19/1989
• Status: Expired due to Fees

• Current Assignee: Boeing Company The WA
• Original Assignee: The Boeing Co.
• Inventors: Stevens, James C., Johnson, Jerome D., Reddy, Mahender, Sargent, Douglas M.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/424,750
• Time in Patent Office: 698 Days
• Field of Search: 324/513, 324/515, 324/541, 324/544, 364/507, 364/562, 364/550, 356/430, 250/562, 250/560, 250/572
• US Class Current: 702/36
• CPC Class Codes: G01R 31/59 while the cable continuously passes the testing apparatus, e.g. during manufacture

Abstract

An improved method and apparatus for inspecting electrical wire (10) is provided. A wire respooling machine (22) advances the electrical wire (10) from a take-off spool (12) to a take-up spool (14). An encoder (24) senses the rotation of the calibrated wheel (15) that is rotated by the electrical wire (10) and produces encoded wire length data. A splice detector (20) senses splices and insulation flaws in the wire (10) and produces a pulse for each detected splice and flaw. A controller (26) receives the encoded wire length data and detected splice and flaw pulses and produces splice and flaw location data representing the locations of the detected splices and flaws relative to the leading end of the wire (10). The controller (26) generates report data that includes said wire length data and said splice and flaw location data. A printer (28) prints the report data in a hard copy format. The controller also produces reverse splice and flaw location data representing the locations of the detected splices and flaws relative to the trailing end of the wire (10). The printer (28) prints a label containing, at least, the reverse splice and flaw location data that is suitable for affixing to the take-up spool (14).

Claims

1. A method of inspecting an insulated electrical wire comprising the steps of:

(a) advancing the electrical wire from a first position to a second position;

(b) measuring the length of the electrical wire as it is advanced and producing electrical wire length data representative of the running total length of the electrical wire;

(c) detecting splices in the electrical wire and producing a splice pulse for each detected splice;

(d) using the splice pulses and the electrical wire length data to determine the location of the detected splices along the length of the electrical wire and producing splice location data that are representative of the locations of the splices as measured from a first reference point proximate to a leading end of the electrical wire as the electrical wire is advanced from the first position to the second position;

(e) producing reversed splice location data that are representative of the locations of the splices as measured from a second reference point proximate to a trailing end of the electrical wire; and

(f) generating a report that includes the electrical wire length data, the splice location data, and the reversed splice location data.

2. The insulated electrical wire inspection method as in claim 1, wherein the measuring step further comprises the steps of:

(a) producing encoded wire length data as the electrical wire is advanced from the first position to the second position; and

(b) storing the encoded wire length data as the running total length of the electrical wire.

3. The insulated electrical wire inspection method as in claim 2, wherein the storing step further comprises the step of updating a first value of the stored encoded wire length data with a second value of the encoded wire length data, the second value being produced subsequent in time to the first value such that the second value represents a current value of the running total length of the electrical wire.

4. The insulated electrical wire inspection method as in claim 3, further comprising the step of determining when the trailing end of the electrical wire advancing from the first position to the second position is reached, the determining step comprising the substeps of:

(a) comparing the first value of the encoded wire length data with the second value of the encoded wire length data; and

(b) producing end-of-wire data when the first value and the second value are substantially the same, the end-of-wire data being representative of the trailing end of the electrical wire.

5. The insulated electrical wire inspection method as in claim 4, further comprising the step of stopping the electrical wire from advancing from the first position to the second position when the end-of-wire data are produced.

6. The insulated electrical wire inspection method as in claim 5, wherein the splice detecting step further comprises the step of detecting an uninsulated portion of the electrical wire.

7. The insulated electrical wire inspection method as in claim 6, wherein the report is printed.

8. Apparatus for inspecting an insulated electrical wire comprising:

(a) advancing means for advancing the electrical wire from a first position to a second position;

(b) measuring means for measuring the length of the electrical wire and for producing electrical wire length data;

(c) splice detecting means for detecting splices in the electrical wire and for producing a splice pulse for each detected splice; and

(d) a controller for controlling the advancing means and for receiving the electrical wire length data from the measuring means and the splice pulse from the splice detecting means, said controller using the detected splice pulses and the electrical wire length data to determine the location of the detected splices and to produce splice location data representative of the location of the detected splices as measured from a leading end of the electrical wire as it advances, and to produce reverse splice location data representative of the location of the detected splices as measured from a trailing end of said electrical wire as it advances, the controller producing a report that includes the electrical wire length data, the splice location data, and the reverse splice location data.

9. The apparatus as in claim 8, wherein the advancing means comprises a wire respooling machine containing a take-off spool located at the first position and a take-up spool located at the second position, the respooling machine causing the electrical wire to advance by unwinding the electrical wire from the take-off spool and rewinding the electrical wire onto the take-up spool.

10. The apparatus as in claim 9, wherein the wire respooling machine includes a drive for rotating the take-up spool, the controller controlling the drive such that the electrical wire causes the take-off spool to rotate as the electrical wire is advanced.

11. The apparatus as in claim 10, wherein the wire respooling machine further comprises a brake for stopping the rotation of the take-off spool when the drive stops the rotation of the take-up spool.

12. The apparatus as in claim 8, wherein said measuring means includes:

(a) a measuring device having a calibrated wheel that is rotated by the electrical wire as it is advanced; and

(b) an encoder coupled to the measuring device for sensing the rotation of the calibrated wheel and producing the electrical wire length data.

13. The apparatus as in claim 12, wherein the apparatus includes printing means for printing a hard copy of the report.

14. The apparatus as in claim 13, wherein the printing means also prints a label suitable for affixing to the take-up spool, wherein the label contains the reverse splice location data.

15. The apparatus as in claim 14, wherein the reverse splice location data is printed on said label in a human readable form.

16. The apparatus as in claim 8, including printing means for printing a label suitable for affixing to the take-up spool, the label containing the reverse splice location data.

17. The apparatus as in claim 16, wherein the reverse splice location data is printed on the label in a human readable form.

18. In an apparatus for inspecting an insulated electrical wire, including a wire respooling machine for advancing the electrical wire from a take-off spool to a take-up spool, a measuring device having a calibrated wheel that is rotated by the advancing electrical wire and a splice detector for detecting splices in the advancing electrical wire and producing a splice pulse for each detected splice, the improvement comprising:

an encoder coupled to said measuring device for sensing the rotation of said calibrated wheel and producing encoded wire length data; and

a controller for controlling the wire respooling machine, said controller receiving said detected splice pulses and said encoded wire length data to determine the location of the splices and to produce splice location data representative of the location of said splices as measured from a leading end of the electrical wire, wherein the controller also operates to reverse said splice location data to produce reverse splice location data representative of said location of the splices as measured from a trailing end of said electrical wire.