Media jam and bent corner detector

• US 7,753,371 B2
• Filed: 12/12/2005
• Issued: 07/13/2010
• Est. Priority Date: 12/12/2005
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Heiles, Tod S., Gudaitis, Algird M, Hui, Kit
• Primary Examiner(s): Mackey; Patrick H
• Assistant Examiner(s): McCullough; Michael C
• Application Number:
  US11/302,027
• Publication Number:
  US 20070134008A1
• Time in Patent Office: 1,674 Days
• Field of Search: 271/258.01, 271/265.01, 347/139, 347/164, 347/193, 347/215, 400/120.13
• US Class Current: 271/265.01
• CPC Class Codes: G03G 15/70 Detecting malfunctions relating to paper handling, e.g. jams
• CPC Class Codes: G03G 2221/1675 jam treatment

Abstract

This invention relates to a media jam and media bent corner detector, comprising: a carriage; a transducer operatively connected to or adjacent to the carriage; and a piezoelectric film beam operatively connected to the transducer such that a portion of the beam substantially extends into a media path to detect the presence of a media jam or a media bent corner.

Claims

1. A media jam and media bent corner detector, comprising:

a print head carriage in which a print head is supported;

a transducer operatively connected to the print head carriage; and

a piezoelectric film beam operatively connected to the transducer and supported by the print head carriage such that a detection portion of the beam substantially extends into a media path formed by a media support surface to detect the presence of a media jam or a media bent corner in the media path,

wherein the detection portion of the beam is spaced from the media support surface.

2. The detector, as in claim 1, wherein the detector is further comprised of:

a bracket located substantially over the transducer and the piezoelectric film beam and attached to the print head carriage.

3. The detector, as in claim 2, wherein the bracket is further comprised of:

a plurality of isolation grommets such that the grommets attach the bracket to the print head carriage.

4. The detector, as in claim 2, wherein the detection portion of the piezoelectric film beam extends from the print head carriage and the bracket into the media path.

5. The detector, as in claim 1, wherein the transducer is further comprised of:

a printed circuit assembly.

6. The detector, as in claim 1, wherein the piezoelectric film beam is further comprised of:

a polyvinylidene fluoride (PVDF) piezoelectric film beam.

7. The detector, as in claim 1, wherein the piezoelectric film beam extends at least across an entire width of media in the media path.

8. The detector, as in claim 1, wherein contact of the media jam or the media bent corner with the piezoelectric film beam deforms the piezoelectric film beam and creates a strain in the transducer, wherein the strain in the transducer determines the presence of the media jam or the media bent corner.

9. The detector, as in claim 1, wherein media in the media path is supported by a media drum, wherein the media drum is stopped when the presence of the media jam or the media bent corner is detected.

10. The detector, as in claim 9, wherein, after the media drum is stopped, the media drum is reversed when the presence of the media jam or the media bent corner is detected.

11. The detector, as in claim 1, wherein the detection portion of the beam is spaced from the media support surface when media is absent from the media path.

12. A media jam and media bent corner detector, comprising:

a print head carriage spaced from a media support surface, the media support surface configured to support media in a media path;

a transducer located substantially adjacent to the print head carriage; and

a piezoelectric film beam operatively connected to the transducer such that an end of the beam substantially extends from the print head carriage toward the media support surface and into the media path to detect the presence of a media jam or a media bent corner in the media path,

wherein the end of the beam is spaced from the media support surface such that a gap is formed between the end of the beam and the media support surface.

13. The detector, as in claim 12, wherein the detector is further comprised of:

a bracket located substantially over the transducer and the piezoelectric film beam and attached to the print head carriage.

14. The detector, as in claim 13, wherein the bracket is further comprised of:

a plurality of isolation grommets such that the grommets attach the bracket to the print head carriage.

15. The detector, as in claim 13, wherein the end of the piezoelectric film beam extends from the print head carriage and the bracket into the media path.

16. The detector, as in claim 12, wherein the transducer is further comprised of:

a printed circuit assembly.

17. The detector, as in claim 12, wherein the piezoelectric film beam is further comprised of:

a polyvinylidene fluoride (PVDF) piezoelectric film beam.

18. The detector, as in claim 12, wherein the piezoelectric film beam extends at least across an entire width of media in the media path.

19. The detector, as in claim 12, wherein contact of the media jam or the media bent corner with the piezoelectric film beam deforms the piezoelectric film beam and creates a strain in the transducer, wherein the strain in the transducer determines the presence of the media jam or the media bent corner.

20. The detector, as in claim 12, wherein media in the media path is supported by a media drum, wherein the media drum is stopped when the presence of the media jam or the media bent corner is detected.

21. The detector, as in claim 20, wherein, after the media drum is stopped, the media drum is reversed when the presence of the media jam or the media bent corner is detected.

22. The detector, as in claim 12, wherein the end of the beam is spaced from the media support surface when media is absent from the media path.

23. The detector, as in claim 12, wherein the beam is supported by the print head carriage, and the print head carriage is configured to support a print head.

24. A media jam and media bent corner detector, comprising:

a printhead carriage supported adjacent a media path formed by a media support surface;

a printed circuit assembly supported by the printhead carriage; and

a piezoelectric film beam operatively connected to the printed circuit assembly and supported by the printhead carriage such that an end of the beam substantially extends linearly from the printhead carriage and into the media path to detect the presence of a media jam or a media bent corner in the media path,

wherein the end of the beam is spaced from the media support surface.

25. The detector, as in claim 24, wherein the end of the beam is spaced from the media support surface when media is absent from the media path.