Cleaning blade, cleaning device and image forming apparatus

A cleaning device capable of removing deposited matter from an image bearing member carrying a liquid developer, said cleaning device comprising:

• a plate-like cleaning blade of elastic member, said cleaning blade including a free end surface provided at one end portion with respect to a height direction of said cleaning blade which is perpendicular to a longitudinal direction of said cleaning blade and to a thickness direction of said cleaning blade, said free end surface being provided with an edge portion at one end portion of said free end surface with respect to the thickness direction;
• and
• a container portion for temporarily containing the liquid developer removed by said cleaning blade,
• wherein said edge portion has a curved portion extending from each end portion of said edge portion with respect to the longitudinal direction in a predetermined range, and a linear portion extending in the longitudinal direction between said curved portions and connecting with said curved portions at respective connecting positions, and
• wherein when said cleaning blade is viewed in the thickness direction:
• a) said curved portion includes a portion having an arcuate shape,
• b) said curved portion is connected with said linear portion such that said linear portion is tangential of the arcuate shape,
• c) a height of said cleaning blade measured in the height direction in the range in which said curved portion is provided increases toward the end portion of said cleaning blade,
• d) a maximum angle formed between said curved portion and said linear portion is not less than 5 degrees, and
• e) said curved portion includes a portion having a radius of curvature not less than 240 mm and not more than 320 mm.

An image forming apparatus using a liquid developer, said apparatus comprising:

• a movable image bearing member;
• an image forming portion for forming a toner image on said image bearing member using the liquid developer;
• a plate-like cleaning blade of elastic member having an edge portion contacted to said image bearing member at a contact portion and configured to remove a deposited matter from said image bearing member with movement of said image bearing member, wherein said cleaning blade includes a free end surface provided at one end portion with respect to a height direction of said cleaning blade which is perpendicular to a longitudinal direction of said cleaning blade and to a thickness direction of said cleaning blade, said free end surface being provided with said edge portion at one end portion of said free end surface with respect to the thickness direction;
• and
• a container portion for temporarily containing the liquid developer removed by said cleaning blade,
• wherein said edge portion has a curved portion extending from each end portion of said edge portion with respect to the longitudinal direction in a predetermined range, and a linear portion extending in the longitudinal direction between said curved portions and connecting with said curved portions at respective connecting positions, and
• wherein when said cleaning blade is viewed in the thickness direction:
• a) said curved portion includes a portion having an arcuate shape,
• b) said curved portion is connected with said linear portion such that said linear portion is tangential of the arcuate shape,
• c) a height of said cleaning blade measured in the height direction in the range in which said curved portion is provided increases toward the end portion of said cleaning blade,
• d) a maximum angle formed between said curved portion and said linear portion is not less than 5 degrees, and
• e) said curved portion includes a portion having a radius of curvature not less than 240 mm and not more than 320 mm.

A plate-like cleaning blade of elastic member capable of removing deposited matter from an image bearing member carrying a liquid developer, said cleaning blade comprising:

• a free end surface provided at one end portion with respect to a height direction of said cleaning blade which is perpendicular to a longitudinal direction of said cleaning blade and to a thickness direction of said cleaning blade, said free end surface being provided with an edge portion at one end portion of said free end surface with respect to the thickness direction,
• wherein said edge portion has an inclined portion extending from each end portion of said edge portion with respect to the longitudinal direction in a predetermined range, and a linear portion extending in the longitudinal direction between said inclined portions and connecting with said inclined portions at respective connecting positions, and
• wherein when said cleaning blade is viewed in the thickness direction:
• a) an inclined portion is provided by serially connecting N linear connecting portions, where N is not less than 4,
• b) a height of said cleaning blade measured in the height direction in the range in which said inclined portion is provided increases toward the end portion of said cleaning blade,
• c) the connecting portion at a position closer to the end portions of said cleaning blade is inclined more relative to said linear portion,
• d) an angle formed between adjacent connecting portions is smaller than an angle of the connecting portion closest to the end portions of said cleaning blade in the longitudinal direction relative to the linear portion divided by N−1, and
• e) an angle of the connecting portion closest to the end portions relative to the linear portion is not less than 5 degrees.

A cleaning device capable of removing deposited matter from an image bearing member carrying a liquid developer, said cleaning device comprising:

• a plate-like cleaning blade of elastic member, said cleaning blade including a free end surface provided at one end portion with respect to a height direction of said cleaning blade which is perpendicular to a longitudinal direction of said cleaning blade and to a thickness direction of said cleaning blade, said free end surface being provided with an edge portion at one end portion of said free end surface with respect to the thickness direction;
• and
• a container portion for temporarily containing the liquid developer removed by said cleaning blade,
• wherein said edge portion has an inclined portion extending from each end portion of said edge portion with respect to the longitudinal direction in a predetermined range, and a linear portion extending in the longitudinal direction between said inclined portions and connecting with said inclined portions at respective connecting positions, and
• wherein when said cleaning blade is viewed in the thickness direction:
• a) an inclined portion is provided by serially connecting N linear connecting portions, where N is not less than 4,
• b) a height of said cleaning blade measured in the height direction in the range in which said inclined portion is provided increases toward the end portion of said cleaning blade,
• c) the connecting portion at a position closer to the end portions of said cleaning blade is inclined more relative to said linear portion,
• d) an angle formed between adjacent connecting portions is smaller than an angle of the connecting portion closest to the end portions of said cleaning blade in the longitudinal direction relative to the linear portion divided by (N−1), and
• e) an angle of the connecting portion closest to the end portions relative to the linear portion is not less than 5 degrees.

An image forming apparatus using a liquid developer, said apparatus comprising:

• a movable image bearing member;
• an image forming portion for forming a toner image on said image bearing member using the liquid developer;
• a plate-like cleaning blade of elastic member having an edge portion contacted to said image bearing member at a contact portion and configured to remove a deposited matter from said image bearing member with movement of said image bearing member, wherein said cleaning blade includes a free end surface provided at one end portion with respect to a height direction of said cleaning blade which is perpendicular to a longitudinal direction of said cleaning blade and to a thickness direction of said cleaning blade, said free end surface being provided with said edge portion at one end portion of said free end surface with respect to the thickness direction;
• and
• a container portion for temporarily containing the liquid developer removed by said cleaning blade,
• wherein said edge portion has an inclined portion extending from each end portion of said edge portion with respect to the longitudinal direction in a predetermined range, and a linear portion extending in the longitudinal direction between said inclined portions and connecting with said inclined portions at respective connecting positions, and
• wherein when said cleaning blade is viewed in the thickness direction:
• a) an inclined portion is provided by serially connecting N linear connecting portions, where N is not less than 4,
• b) a height of said cleaning blade measured in the height direction in the range in which said inclined portion is provided increases toward the end portion of said cleaning blade,
• c) the connecting portion at a position closer to the end portions of said cleaning blade is inclined more relative to said linear portion,
• d) an angle formed between adjacent connecting portions is smaller than an angle of the connecting portion closest to the end portions of said cleaning blade in the longitudinal direction relative to the linear portion divided by (N−1), and
• e) an angle of the connecting portion closest to the end portions relative to the linear portion is not less than 5 degrees.