Reciprocation brush contact charger
AssigneeSamsung Electronics Co., Ltd.
InventorKi-Jae To
Life of this patent
Estimating the term…
Abstract
A brush contact charger charges a photosensitive drum of an image forming apparatus adopting an electrostatic recording system, and has a body having a brush for contacting a photosensitive drum and then charging the photosensitive drum, a reciprocating portion for reciprocating the body perpendicularly with respect to the proceeding direction of the photosensitive drum, and a guide member for supporting the body while guiding the reciprocal movement of the body. The charger charges the surface of the photosensitive drum while moving at a right angle with respect to the proceeding direction of the photosensitive drum and charges the surface of the photosensitive drum to an electrical potential having a nearly uniform distribution.
Claims21
A brush contact charger for charging a photosensitive drum of an image forming apparatus of an electrostatic recording system, said brush contact charger comprising:
- a body having a brush disposed to be in contact with said photosensitive drum, said brush providing an electrostatic charge to said photosensitive drum;
- reciprocating means for vibrating said body perpendicularly with respect to a rotating direction of said photosensitive drum, said reciprocating means comprising:
- a first gear installed on a rotational shaft of said photosensitive drum, said first gear being rotated in dependence upon rotation of said rotational shaft;
- a second gear engagedly meshed with said first gear, said second gear being rotated simultaneously with said first gear;
- a cam fixed to said second gear, said cam being rotated simultaneously with said second gear for moving said body in a first direction;
- and
- biasing means for moving said body in a second direction opposite to said first direction.
A brush contact charger for charging a photosensitive drum of an image forming apparatus adopting an electrostatic recording system, said brush contact charger comprising:
- a body having a brush disposed to be in contact with said photosensitive drum, said brush providing an electrostatic charge to said photosensitive drum;
- means for reciprocating said body perpendicularly with respect to a rotating direction of said photosensitive drum, said means for reciprocating comprising:
- a first gear installed on a rotational shaft of said photosensitive drum, said first gear being rotated in dependence upon rotation of said rotational shaft;
- a second gear engagedly meshed with said first gear, said second gear being rotated simultaneously with said first gear;
- a cam fixed to said second gear, said cam being rotated simultaneously with said second gear for moving said body in a first direction;
- and
- biasing means for moving said body in a second direction opposite to said first direction;
- and
- guide means for slidably supporting said body during reciprocal movement of said body.
A charging apparatus, comprising:
- a brush contact charger for charging a photosensitive drum of an image forming apparatus, said brush contact charger comprising:
- a body,
- a brush connected to said body and in contact with said photosensitive drum for providing an electrostatic charge to said photosensitive drum, and
- reciprocating means for moving said body in a direction perpendicular to a rotating direction of said photosensitive drum, said reciprocating means comprising:
- a first gear installed on a rotational shaft of said photosensitive drum, said first gear rotating in dependence upon rotation of said rotational shaft;
- a second gear engagedly meshed with said first gear, said second gear being rotated simultaneously with said first gear;
- a cam fixed to said second gear, said cam being rotated simultaneously with said second gear for moving said body in a first direction, said cam comprising an undulated surface for enabling uniform reciprocal movement of said body;
- and
- biasing means for moving said body in a second direction opposite said first direction.
A brush contact charger for charging a photosensitive drum of an image forming apparatus adopting an electrostatic recording system, said brush contact charger comprising:
- brush means having a body portion and a brush portion connected to said body portion, said brush portion contacting a surface portion of said photosensitive drum for providing an electrostatic charge to said surface portion of said photosensitive drum;
- and
- means for reciprocally moving said brush means in a longitudinal direction of said photosensitive drum, said means for reciprocally moving said brush means comprising:
- a first gear installed on a rotational shaft of said photosensitive drum, said first gear being rotated in dependence upon rotation of said rotational shaft;
- a second gear engagedly meshed with said first gear, said second gear being rotated simultaneously with said first gear;
- a cam fixed to said second gear, said cam being rotated simultaneously with said second gear;
- cam contact means extending from one end of said body portion for maintaining contact with said cam for moving said brush means in a first direction;
- and
- biasing means extending from an opposite end of said body portion for moving said brush means in a second direction opposite said first direction;
- and
- guide means for slidably supporting said body portion during reciprocal movement of said brush means.
A charging apparatus, comprising:
- a brush contact charger for charging a photosensitive drum of an image forming apparatus, said brush contact charger comprising:
- a body,
- a brush connected to said body and in contact with said photosensitive drum for providing an electrostatic charge to said photosensitive drum, and
- reciprocating means for moving said body in a direction perpendicular to a rotating direction of said photosensitive drum, said reciprocating means comprising:
- a first gear installed on a rotational shaft of said photosensitive drum, said first gear being rotated in dependence upon rotation of said rotational shaft;
- a second gear engagedly meshed with said first gear, said second gear being rotated simultaneously with said first gear;
- a cam fixed to said second gear, said cam being rotated simultaneously with said second gear for moving said body in a first direction;
- biasing means for moving said body in a second direction opposite said first direction;
- and
- a pair of shafts slidably engaged with said body and slidably supporting said body during reciprocal movement of said body.
Dependencies are inferred from the claim text.