Laser bent beam controlled dwell wire stripper

• US 3,953,706 A
• Filed: 12/04/1974
• Issued: 04/27/1976
• Est. Priority Date: 03/29/1974
• Status: Expired due to Term

• Current Assignee: Martin Marietta Corporation
• Original Assignee: Martin Marietta Corporation
• Inventors: Layton, Allen C., Howle, Robert E., Harris, Charles W.
• Primary Examiner(s): Truhe, J. V.
• Assistant Examiner(s): Peterson, G. R.
• Application Number:
  US05/529,553
• Time in Patent Office: 510 Days
• Field of Search: 219/121 L, 219/121 LM, 219/121 EB, 219/121 EM, 219/85, 219/50, 219/349, 331/DIG. 1, 350/6, 350/7, 350/285, 350/286, 81/9.5 R, 30/140, 29/427, 29/203, 29/497.5
• US Class Current: 219/121.68
• CPC Class Codes: B23K 26/103 the laser beam rotating around the fixed workpiece B23K26/28 takes precedence
• CPC Class Codes: H02G 1/128 using radiant energy, e.g. a laser beam

Abstract

A device for enabling the stripping of a selected portion of the insulation from an electrical lead on a rapid basis without damage to the conductor portion of the lead, involving the use of a rotatable optical unit. Our novel optical unit is equipped with an aperture at each end, with a first of these apertures being configured to selectively receive a variety of types of electrical leads whose ends are to be stripped of insulation for a certain length, and the second aperture being arranged to receive output energy from an adjacently located laser operating at a wavelength and power level such as will cause ablation of insulation at the specified location on the electrical lead. These apertures are located on the axis of rotation of the optical unit, and optical components are utilized in the unit such as will direct and focus a laser beam at essentially right angles to a nonrotating lead inserted through the first aperture. As a result of the rotation of the optical unit, a circumferential cut may be made in the insulation of the electrical lead at the location selected by the user, thus enabling the removal of such selected portion of the insulation from the conductor or conductors of the lead. Our novel optical unit can also be utilized in a nonrotating mode as will enable a longitudinal cut to be made in an electrical lead as it is being withdrawn from the unit, or in a mode involving a withdrawal of the lead during slow rotation of the unit, thus enabling a helical cut of a type particularly desirable in the removal of insulation from a twisted lead.

Claims

1. A device for enabling the selective stripping of a portion of the insulation from an electrical lead on a rapid basis without damage to the conductor portion of the lead, comprising a rotatable optical unit having an aperture at each end, a first of said apertures being configured to receive a variety of sizes and types of electrical leads whose ends are to be stripped of insulation for a selected length, and the second of said apertures being arranged to receive output energy from an adjacently located laser operating at a wavelength and power level such as will cause the ablation of insulation, each of said apertures being disposed essentially on the axis of rotation of said optical unit, and optical components disposed in said optical unit at locations between said apertures for appropriately re-directing the laser energy entering through said second aperture, said optical components being responsible for directing and focusing a laser beam upon a nonrotating lead inserted through said first aperture, such laser beam, because of the rotation of said optical unit, providing a circumferential cut in the insulation of the electrical lead at a location selected by the user, thus to enable the removal of such selected portion of the insulation from the conductor of the lead.

2. The device for stripping insulation from an electrical lead as defined in claim 1 in which said first aperture is configured to receive a lead holder, said lead holder having an elongate hole on its principal axis in which is disposed a movable abutment, said abutment being movable to any of a large number of selected locations, thus making it possible to determine the depth to which the electrical lead to be stripped can be inserted.

3. The device as defined in claim 2 in which a plurality of lead holders is provided, so as to be usable interchangeably in said optical unit, said lead holders having elongate holes of varying sizes, thus making it possible to properly accommodate leads of different diameters.

4. The device as defined in claim 1 in which movable blocking means is operatively associated with said second aperture, such that energy from the adjacent laser normally cannot reach the vicinity of said first aperture, and means for selectively causing said blocking means to move to an operative position out of the path taken by the energy output from the laser at such time as a lead is to be stripped.

5. The device as defined in claim 4 in which said means for selectively controlling said blocking means is under the control of the operator.

6. The device as defined in claim 4 in which said blocking means utilizes a reflecting surface, which causes the laser energy from the adjacent laser to be directed into a power meter when said blocking means is in the position away from the position allowing a lead to be stripped, and readout means operatively associated with said power meter, thus to enable the operator of the device to ascertain whether the power level of the laser is appropriate for a given wire stripping operation.

7. The device as defined in claim 1 in which said optical unit can be operated either in a rotating mode enabling a circumferential cut to be made in insulation, or a non-rotating mode enabling a longitudinal cut to be made in such insulation.

8. The arrangement as defined in claim 7 in which means are provided for bringing about the withdrawal at a controlled rate of a lead inserted into said optical unit while laser energy is being directed at the insulation of the lead, thereby to achieve a longitudinal cut simplifying the removal of the insulation.

9. The device as defined in claim 1 in which said optical unit can be operated in a mode enabling a helical cut to be made in such insulation, involving the slow rotation of said optical unit as the lead is being withdrawn.

10. A device for enabling the selective stripping of a portion of the insulation from an electrical lead on a rapid basis without damage to the conductor portion of the lead, comprising an optical unit having an aperture configured to receive an electrical lead whose end is to be stripped of insulation for a selected length, said optical unit having an additional aperture, arranged to receive output energy from an adjacently located laser operating at a wavelength and power level such as will cause the ablation of insulation, and optical components disposed in said optical unit at locations between said apertures for appropriately re-directing the laser energy entering through latter aperture, said optical components being responsible for directing and focusing a laser beam upon a lead inserted through said first mentioned aperture, such laser beam providing a cut in the insulation of the electrical lead at a location selected by the user, thus to enable the removal of such selected portion of the insulation from the conductor of the lead.

11. The device as defined in claim 10 in which said optical unit can be operated either in a rotating mode enabling a circumferential cut to be made in the insulation, or in a non-rotating mode enabling a longitudinal cut to be made in such insulation.

12. The device for stripping insulation from an electrical lead as defined in claim 10 in which said first aperture is configured to receive a lead holder, said lead holder having an elongate hole on its principal axis in which is disposed a movable abutment, said abutment being movable to any of a large number of selected locations, thus making it possible to determine the depth to which the electrical lead to be stripped can be inserted.

13. The device as defined in claim 12 in which a plurality of lead holders is provided, so as to be usable interchangeably in said optical unit, said lead holders having elongate holes of varying sizes, thus making it possible to properly accommodate leads of different diameters.

14. The device as defined in claim 10 in which movable blocking means is operatively associated with said second aperture, such that energy from the adjacent laser normally cannot reach the vicinity of said first aperture, and means for selectively causing said blocking means to move to an operative position out of the path taken by the energy output from the laser at such time as a lead is to be stripped.

15. A device for enabling the selective stripping of a portion of the insulation from an electrical lead on a rapid basis without damage to the conductor portion of the lead, comprising an optical unit capable of nonrotational operation, as well as operation at selected rotational speeds, said unit having an aperture at each end, a first of said apertures being configured to receive a variety of sizes and types of electrical leads whose ends are to be stripped of insulation for a selected length, and the second of said apertures being arranged to receive output energy from an adjacently located laser operating at a wavelength and power level such as will cause the ablation of insulation, and optical components disposed in said optical unit at locations between said apertures for appropriately re-directing the laser energy entering through said second aperture, said optical components being responsible for directing and focusing a laser beam upon a non-rotating lead inserted through said first aperture, such laser beam, during rotational operation of said optical unit, providing a circumferential cut in the insulation of an inserted electrical lead at a location selected by the user, and during non-rotational operation, providing a longitudinal cut in the insulation of an inserted electrical lead at a selected location, thus in each instance serving to simplify the removal of such selected portion of the insulation from the conductor of the lead.

16. The device for stripping insulation from an electrical lead as defined in claim 15 in which said first aperture is configured to receive a lead holder, said lead holder having an elongate hole on its principal axis in which is disposed a movable abutment, said abutment being movable to any of a large number of selected locations, thus making it possible to determine the depth to which the electrical lead to be stripped can be inserted.

17. The device as defined in claim 16 in which a plurality of lead holders is provided, so as to be usable interchangeably in said optical unit, said lead holders having elongate holes of varying sizes, thus making it possible to properly accommodate leads of different diameters.

18. The device as defined in claim 15 in which movable blocking means is operatively associated with said second aperture, such that energy from the adjacent laser normally cannot reach the vicinity of said first aperture, and means for selectively causing said blocking means to move to an operative position out of the path taken by the energy output from the laser at such time as a lead is to be stripped.

19. The device as defined in claim 18 in which said means for selectively controlling said blocking means is under the control of the operator.

20. The device as defined in claim 18 in which said blocking means utilizes a reflecting surface, which causes the laser energy from the adjacent laser to be directed into a power meter when said blocking means is in the position away from the position allowing a lead to be stripped, and readout means operatively associated with said power meter, thus to enable the operator of the device to ascertain whether the power level of the laser is appropriate for a given wire stripping operation.

21. The arrangement as defined in claim 15 in which mean are provided for bringing about the withdrawal at a controlled rate of a lead inserted into said optical unit while laser energy is being directed at the insulation of the lead, thereby to achieve a longitudinal cut simplifying the removal of the insulation.

22. The device as defined in claim 15 in which said optical unit can be operated in a mode enabling a helical cut to be made in such insulation, involving the slow rotation of said optical unit as the lead is being withdrawn.