Cartridge with a sheet to remove matter from a surface of a photosensitive drum

Patent metadata

Field	Value
Publication number	US-11112753-B2
Application number	US-201916728274-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Dec 28, 2018
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A cartridge detachably mountable to a main assembly of an image forming apparatus includes a photosensitive member unit including a photosensitive drum; a sheet configured to remove a deposited matter from a surface of the drum, the sheet being in contact with the surface of the drum at an end portion of the drum with respect to a rotational axis direction of the member; and a developing unit detachably mounted to the member unit, the developing unit including a developing roller configured to supply toner to the drum, and a storage portion configured to store the deposited matter removed from the surface of the drum by the sheet.

First claim

What is claimed is:

1. A cartridge detachably mountable to a main assembly of an image forming apparatus, the cartridge comprising:
a photosensitive member unit including a photosensitive drum;
a sheet configured to remove deposited matter from a surface of the photosensitive drum, the sheet being in contact with the surface of the photosensitive drum at an end portion of the photosensitive drum with respect to a rotational axis direction of the photosensitive member; and
a developing unit detachably mounted to the photosensitive member unit, the developing unit including a developing roller configured to supply toner to the photosensitive drum, and a storage portion configured to store the deposited matter removed from the surface of the photosensitive drum by the sheet.

2. A cartridge according to claim 1 , wherein the sheet is provided in the photosensitive member unit.

3. A cartridge according to claim 1 , wherein the sheet is provided in the developing unit.

4. A cartridge according to claim 1 , wherein the storage portion is disposed at a position opposed to a region of the photosensitive drum where the photosensitive drum is contacted by the sheet.

5. A cartridge according to claim 1 , wherein a gear is provided at an end portion of the photosensitive drum adjacent to the storage portion, and the storage portion extends from outside of the gear to inside of one end surface of the photosensitive drum with respect to the rotational axis direction.

6. A cartridge according to claim 1 , wherein the sheet is disposed at a position overlapping the developing roller in the rotational axis direction.

7. A cartridge according to claim 1 , wherein the developing unit includes a developing device frame rotatably supporting the developing roller, and a sealing member filling a gap between the developing device frame and an end portion of the developing roller with respect to the rotational axis direction, and
wherein the sheet is disposed at a position overlapping a region of the developing roller where it is contacted by the sealing member.

8. A cartridge according to claim 1 , further comprising a transfer member contacting the photosensitive drum to form a transfer nip,
wherein, in the transfer nip, an image carried on the photosensitive drum is transferred onto a recording material that is fed therein when the cartridge is mounted in the main assembly,
wherein the developing roller contacts the photosensitive drum to form a development contact portion, and
wherein the sheet contacts the surface of the photosensitive drum at a position downstream of the development contact portion and the upstream of the transfer nip in a rotational direction of the photosensitive drum.

9. A cartridge according to claim 1 , wherein the developing roller contacts the photosensitive drum.

10. A cartridge according to claim 1 , wherein the storage portion is disposed directly below the developing roller.

11. A cartridge according to claim 8 , wherein the sheet contacts the surface of said photosensitive drum at a position outside of the development contact portion.

12. A developing cartridge detachably mountable to a photosensitive member cartridge detachably mountable to a main assembly of an image forming apparatus, the photosensitive member cartridge including (i) a photosensitive drum, and (ii) a sheet configured to remove deposited matter from a surface of the photosensitive drum, the sheet being in contact with the surface of the photosensitive drum at an end portion of the photosensitive drum with respect to a rotational axis direction of the photosensitive member, the developing cartridge comprising:
a developing roller configured to supply the toner to the photosensitive drum; and
a storage portion configured to store the deposited matter removed from the surface of the photosensitive drum by the sheet.

13. A developing cartridge according to claim 12 , wherein the developing roller is configured to contact the photosensitive drum.

14. A developing cartridge according to claim 12 , wherein the storage portion is disposed directly below the developing roller.

15. A cartridge detachably mountable to a main assembly of an image forming apparatus, the cartridge comprising:
a photosensitive member unit including a photosensitive drum;
a sheet configured to be in contact with a surface of the photosensitive drum at an end portion of the photosensitive drum with respect to a rotational axis direction of the photosensitive member; and
a developing unit detachably mounted to the photosensitive member unit, the developing unit including a developing roller configured to supply toner to the photosensitive drum and a recessed portion that is recessed in a direction away from the photosensitive member unit, with the recessed portion being positioned under the surface of the photosensitive drum when the cartridge is mounted to the main assembly.

16. A cartridge according to claim 15 , wherein the sheet is provided in the photosensitive member unit.

17. A cartridge according to claim 15 , wherein the sheet is provided in the developing unit.

Assignees

• Canon Kk

Inventors

• Kawakami Takuya
• Komatsu Noriyuki
• Numata Tetsuya
• Asanuma Naoya
• Makiguchi Daisuke

Classifications

• G03G2221/0063

  Cleaning device for foreign matter separate from residual toner cleaning device · CPC title

• G03G2221/0057

  Separate cleaning members for foreign matter and residual toner · CPC title

• G03G21/1828

  Prevention of damage or soiling, e.g. mechanical abrasion (G03G21/1839 takes precedence) · CPC title

• G03G21/10

  Collecting or recycling waste developer · CPC title

• G03G15/0817

  characterised by the lateral sealing at both sides of the donor member with respect to the developer carrying direction · CPC title