Paper tray moisture control

• US 6,823,151 B2
• Filed: 09/09/2003
• Issued: 11/23/2004
• Est. Priority Date: 02/21/2002
• 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: Sesek, Robert, Parry, Travis J., Carlson, Gerard J.
• Primary Examiner(s): Royer, William J.
• Application Number:
  US10/658,860
• Publication Number:
  US 20040047644A1
• Time in Patent Office: 441 Days
• Field of Search: 399/44, 399/92, 399/97, 399/390, 399/393, 271/3.03, 271/3.05, 271/9.01, 271/11
• US Class Current: 399/92
• CPC Class Codes: B41J 13/103 for the sheet feeding section
• CPC Class Codes: B65H 1/00 Supports or magazines for piles from which articles are to be separated carriers used for associating, collating, or gathering articles B65H39/00
• CPC Class Codes: B65H 2407/30 Means for preventing damage of handled material, e.g. by controlling atmosphere
• CPC Class Codes: G03G 15/6502 Supplying of sheet copy material; Cassettes therefor
• CPC Class Codes: G03G 2215/00666 Heating or drying device
• CPC Class Codes: G03G 2215/00776 of humidity or moisture influencing copy sheet handling

Abstract

A moisture-reducing paper tray including a desiccant that absorbs moisture from the environment of the paper tray and consequently the paper supply itself. As a result, the desiccant may become saturated as moisture is adsorbed. In one embodiment of the invention, the desiccant may be changed for a fresh desiccant. In an alternate embodiment of the invention, the moisture-reducing paper tray may also include a drying mechanism which includes a heating element, a blower and a humidity sensor. The humidity sensor is positioned to sense a humidity level in the paper tray. When a pre-selected humidity level in the paper tray is equaled or exceeded, the heating element and blower are energized and warm air passes into the paper tray drying the desiccant.

Claims

1. A moisture-reducing device for print media comprising:

a paper tray for containing and supporting the print media, the paper tray including a recess formed in an interior of the paper tray; and

a desiccant contained in the paper tray recess proximate to the print media for absorbing moisture from the environment of the paper tray.

2. The moisture-reducing device of claim 1 wherein the desiccant further comprises a silica gel.

3. The moisture-reducing device of claim 1 wherein the desiccant further comprises an activated alumina.

4. The moisture-reducing device of claim 1 wherein the desiccant further comprises a lithium chloride salt.

5. The moisture-reducing device of claim 1 wherein the desiccant further comprises a pre-packaged desiccant.

6. The moisture-reducing device of claim 1 wherein the paper tray is lined with the desiccant.

7. The moisture-reducing device of claim 1 wherein the desiccant further comprises a molded panel.

8. The moisture reducing device of claim 1 further comprising a panel including a plurality of apertures covering the desiccant placed in the recess.

9. The moisture-reducing device of claim 1 further comprising:

an air passage pneumatically connected to the paper tray;

a heating element pneumatically connected to the air passage;

a blower pneumatically connected to the air passage for pressurizing an air flow across the heating element into the paper tray directing a pressurized air flow across the desiccant for purging accumulated moisture from the desiccant.

10. The moisture-reducing device of claim 9 further comprising a humidity sensor connected to the heating element, the heating element responsive to a signal from the humidity sensor indicating that a moisture level of the desiccant equals a pre-selected moisture level.

11. The moisture-reducing device of claim 9, wherein the heating element further comprises an intermittently operating heating element.

12. An image forming device comprising:

a controller contained within a housing;

a print engine including a developer assembly connected to and operatively responsive to the controller;

a paper tray attachable to the housing for containing and supporting a media, the paper tray including a recess formed in an interior of the paper tray;

a media transport mechanism contained within the housing for picking the media from the paper tray and transporting the media through the print engine; and

a desiccant contained in the paper tray recess proximate to the media for absorbing moisture from the environment of the paper tray.

13. The image forming device of claim 12 further comprising:

an air passage pneumatically connected to the paper tray;

a heating element positioned within the air passage;

a blower pneumatically connected to the air passage for pressurizing an air flow across the heating element and into the paper tray directing a pressurized air flow across the desiccant purging accumulated moisture from the desiccant.

14. The image forming device of claim 13 further comprising a humidity sensor connected to the heating element, the heating element responsive to a signal from the humidity sensor indicating that a moisture level of the desiccant equals a pre-selected moisture level.

15. The image forming device of claim 13 wherein the heating element further comprising an intermittently operating heating element.

16. The image forming device of claim 12 wherein the heating element operates in response to a signal from the controller responsive to a pre-selected number of image forming cycles.

17. The image forming device of claim 12 wherein the desiccant further comprises a silica gel.

18. The image forming device of claim 12 wherein the desiccant further comprises an activated alumina.

19. The image forming device of claim 12 wherein the desiccant further comprises a lithium chloride salt.