ADHESIVE PAPER PICK-OFF SYSTEM

• US 3,857,560 A
• Filed: 07/23/1973
• Issued: 12/31/1974
• Est. Priority Date: 07/23/1973
• Status: Expired due to Term

• Current Assignee: Robert William Gundlach
• Original Assignee: Robert William Gundlach
• Inventors: Gundlach, Robert William
• Primary Examiner(s): Moses, Richard L.
• Application Number:
  US05/381,933
• Time in Patent Office: 526 Days
• Field of Search: 355/133,14,3R 221/210 271/33,DIG.2,174
• US Class Current: 271/307
• CPC Class Codes: B65H 29/56 for stripping from elements or machines for electrographic machines G03G
• CPC Class Codes: B65H 3/20 using adhesives
• CPC Class Codes: G03G 15/6532 Removing a copy sheet form a xerographic drum, band or plate removing sheets from printing cylinders B65H29/02
• CPC Class Codes: Y10S 271/90 Stripper

Abstract

An adhesive paper pick-off apparatus for lifting and guiding a sheet of paper from a supply stack or the like or adhereing to a photoreceptor layer of an electrostatographic copying machine. The apparatus includes an adhesive tape supply which may be housed in a cartridge having a wall with one or more open windows. The apparatus is positioned relative to the supply stack or photoreceptor layer so that the exposed side of the paper comes in contact with one side of the window. The apparatus includes means for pressure contacting the sticky side of the tape to the paper from the cartridge through the window for lifting the paper from the supply stack or the photoreceptor layer and the like. Preferably, the window is screened with a mesh of fine wires or filaments with openings large enough to allow contact of the tape to the paper, but small enough to prevent the paper from deforming into the openings and is of a design that helps the release of the adhesive tape from the paper when the tape is retracted. Preferably, the wires or filaments are made of a nonsticky substance such as teflon or silicon rubber so that the adhesive tape does not stick to them and they do not collect lint from the paper. The apparatus is provided with means for advancing the adhesive tape supply to bring a fresh portion of the sticky side of the adhesive tape as a used portion begins to loose its stickiness due to the lint collected from the surfaces of the sheets.

Claims

1. An apparatus for stripping a sheet adherent to a surface, comprising:

a member having an opening;

an adhesive tape;

a mesh of a plurality of non-sticky wires positioned in the opening and forming a grid screen thin enough to allow contact of the adhesive tape to the sheet through the openings of said mesh but strong enough to prevent the paper from deforming into the openings;

means for positioning the adhesive tape against said grid mesh for pressure contacting the sticky side of the adhesive tape to the sheet through the grid.

2. The apparatus according to claim 1, wherein said wires are made of high strength metallic member coated with a non-sticky substance.

3. The apparatus according to claim 2, wherein said coating substance is teflon.

4. The apparatus according to claim 2, wherein said substance is silicon rubber.

5. The apparatus according to claim 1, wherein said wires are made of monofilament teflon.

6. The apparatus according to claim 1, including means for guiding and advancing forward the lifted leading edge of the sheet away from said surface.

7. In a xerographic copier/duplicator, wherein a copy sheet adheres electrostatically to a photoreceptor layer by the image transferring corona, the improvement which comprises a pick-off apparatus having an adhesive tape and a screened window disposed adjacent the image transfer station, said window having a non-sticky grid mesh wires arrayed to allow contact of the tape to the sheet through the mesh openings but spaced close enough to keep the sheet from deforming into the mesh openings, and means for pressure contacting the sticky side of the adhesive tape to the sheet for stripping the sheet away from the photoreceptor layer.

8. The apparatus according to claim 7, including a roll of adhesive tape and means for advancing the adhesive tape to move a new and unused portion of the sticky side of the tape into said window and move out the used portion of the adhesive tape.

9. The apparatus according to claim 8, including means for counting the copies made and generating a copy count signal;

said advancing means adapted to move said adhesive tape forward by an incremental amount in response to the copy count signal to bring the new and unused portion of the adhesive tape against the sheet.

10. The apparatus according to claim 9, wherein said advancing means is adapted to advance said adhesive tape by an amount sufficient to move out the entire portion of the used tape from said window and move in an entirely new portion into said window after a predetermined number of copy count signals.

11. The apparatus according to claim 9, wherein said advancing means is adapted to advance said adhesive tape by an amount so that a portion of the used tape is moved out of said window and an unused portion is moved into said window in response to each of the copy count signals.

12. The apparatus according to claim 7, said wires are made of high tensile material having non-sticky surface.

13. The apparatus according to claim 12, said wire is made of monofilament teflon.

14. The apparatus according to claim 12, said wire is made of metallic member coated with silicon rubber.

15. The apparatus according to claim 12, said wire is made of metallic member coated with teflon.