Multi-layer sheet feeder

• US 7,300,047 B2
• Filed: 05/28/2004
• Issued: 11/27/2007
• Est. Priority Date: 05/28/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Haas, Robert, Baum, Robert A., Kee, Tang
• Primary Examiner(s): Mackey; Patrick
• Assistant Examiner(s): Severson; Jeremy R.
• Application Number:
  US10/857,328
• Publication Number:
  US 20050275152A1
• Time in Patent Office: 1,278 Days
• Field of Search: 271121-125, 271/109, 271/264, 492 9- 11, 152/154.2, 731/46, 347/216, 358/498
• US Class Current: 271/8.1
• CPC Class Codes: B65H 2220/02 indicating an entity which is controlled, adjusted or changed by a control process, i.e. output
• CPC Class Codes: B65H 2404/187 with wear resistance
• CPC Class Codes: B65H 2511/411 of colour
• CPC Class Codes: B65H 2601/121 Wear
• CPC Class Codes: B65H 2601/522 Wear of friction surface
• CPC Class Codes: B65H 3/06 Rollers or like rotary separators B65H3/42 takes precedence
• CPC Class Codes: B65H 3/34 Article-retaining devices controlling the release of the articles to the separators

Abstract

A sheet feed mechanism having a multi-layer structure. The multi-layer structure has a wear layer adapted to contact a sheet during sheet feeding and a replacement indicator layer adjacent the wear layer. The replacement indicator layer is adapted to indicate a wear condition of the multi-layer structure upon wear through the wear layer to the replacement indicator layer.

Claims

1. A sheet feed mechanism, comprising:

a multi-layer structure, comprising;

a wear layer adapted to contact a sheet during sheet feeding; and

a replacement indicator layer adjacent the wear layer and adapted to indicate a wear condition of the multi-layer structure upon wear through the wear layer to the replacement indicator layer, wherein one of the wear layer and the replacement indicator layer comprises an electrically conductive material that is adapted to change a circuit from one state to another upon wear through the wear layer to the replacement indicator layer.

2. The sheet feed mechanism of claim 1, wherein the wear layer comprises a first color and the replacement indicator layer comprises a second color different from the first color.

3. The sheet feed mechanism of claim 1, wherein the other of the wear layer and the replacement indicator layer comprises a non-conductive material.

4. The sheet feed mechanism of claim 1, wherein the multi-layer structure is adapted to create a notification signal upon wear through the wear layer to the replacement indicator layer.

5. The sheet feed mechanism of claim 1, wherein the multi-layer structure comprises a sheet separation pad.

6. The sheet feed mechanism of claim 1, wherein the multi-layer structure comprises a sheet feed roller.

7. The sheet feed mechanism of claim 1, comprising a sheet-feed device comprising an electrical indicator configured to notify a user of the wear condition based on the state of the circuit.

8. A sheet-feed system, comprising:

a sheet feeder mechanism, having at least one separation apparatus comprising a plurality of layers adapted to indicate a wear condition upon wear through one layer to another of the plurality of layers, wherein at least one of the plurality of layers includes an electrically conductive material that is configured to provide an electrical indication of the wear condition when the at least one of the plurality of layers is worn through.

9. The sheet-feed system of claim 8, wherein the sheet feeder mechanism is coupled to a fax machine.

10. The sheet-feed system of claim 8, wherein the sheet feeder mechanism is coupled to a copy machine.

11. The sheet-feed system of claim 8, wherein the sheet feeder mechanism is coupled to a scanner.

12. The sheet-feed system of claim 8, wherein the plurality of layers comprise at least two different colors.

13. The sheet-feed system of claim 8, wherein the plurality of layers comprise a non-conductive layer that is not electrically conductive disposed adjacent the at least one of the plurality of layers that includes the electrically conductive material.

14. The sheet-feed system of claim 8, wherein the sheet feeder mechanism is coupled to a printer.

15. A method, comprising:

providing a multi-layer sheet separator comprising a plurality of layers indicative of a wear condition upon wear through one layer to another of the plurality of layers, wherein at least one of the plurality of layers includes conductive material that is configured to provide an electrical indication when the at least one of the plurality of layers is worn through.

16. The method of claim 15, wherein providing the multi-layer sheet separator comprises forming a multi-layer sheet separation pad.

17. The method of claim 15, wherein providing the multi-layer sheet separator comprises forming a multi-layer roller.

18. The method of claim 15, wherein providing the multi-layer separator comprises co-extruding first and second layers to form the multi-layer sheet separator.

19. The method of claim 15, wherein providing the multi-layer sheet separator comprises forming a first layer and a second layer of a different color than the first layer.

20. The method of claim 15, further comprising providing an automatic sheet feeder having the multi-layer sheet separator.

21. The method of claim 20, further comprising coupling a sheet-feed device to the automatic sheet feeder.

22. A sheet feed system, comprising:

means for feeding at least one sheet; and

means for multi-layer indication of a wear condition of the means for feeding,

wherein the means for multi-layer indication of the wear condition comprise a layer of conductive material providing an electrical indication of wear upon one of wearing through and wearing to the layer of conductive material.

23. The system of claim 22 wherein the means for feeding comprise means for rolling against an exposed sheet surface of the at least one sheet.

24. The system of claim 22, wherein the means for feeding comprises means for separating the at least one sheet.