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US 8,798,503 B2Granted
Belt unit configuration for an image forming apparatus
AssigneeBrother Kogyo Kabushiki Kaisha
InventorWataru Yamaguchi
Life of this patent
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Abstract
An image forming apparatus including an endless belt in a belt unit is disclosed. The image forming apparatus includes an engaging portion that contacts the belt unit such that the surface of the belt is placed under tension while the belt unit is urged against the engaging portion.
Claims15
An image forming apparatus comprising:
- an apparatus body including a first body-side engaging portion;
- an image formation unit configured to form an image on a recording sheet;
- and
- a belt unit including:
- a belt frame;
- a pair of rollers supported by the belt frame;
- an endless belt extending between the rollers, the rollers being spaced apart in a belt extending direction;
- a first belt-side engaging portion configured to engage the first body-side engaging portion;
- and
- an elastic member configured to urge one of the rollers in a direction away from the other one of the rollers to apply a tension to the endless belt and to urge the first belt-side engaging portion against the first body-side engaging portion in a specified direction away from the one of the rollers,
- wherein the first belt-side engaging portion includes a first guide surface, and
- wherein, as the first belt-side engaging portion engages the first body-side engaging portion, the first body-side engaging portion presses the first guide surface such that the first belt-side engaging portion moves toward the elastic member.
9 more elements
The image forming apparatus according to 1, wherein the first guide surface is inclined with respect to the belt extending direction.
An image forming apparatus comprising:
- an apparatus body including a first body-side engaging portion;
- an image formation unit configured to form an image on a recording sheet;
- and
- a belt unit including:
- a belt frame;
- a pair of rollers supported by the belt frame;
- an endless belt extending between the rollers, the rollers being spaced apart in a belt extending direction;
- a first belt-side engaging portion configured to engage the first body-side engaging portion;
- and
- an elastic member configured to urge one of the rollers in a direction away from the other one of the rollers to apply a tension to the endless belt and to urge the first belt-side engaging portion against the first body-side engaging portion in a specified direction away from the one of the rollers,
- wherein the first belt-side engaging portion includes a second guide surface, and
- wherein as the first belt-side engaging portion disengages from the first body-side engaging portion, the first body-side engaging portion presses the second guide surface such that the first belt-side engaging portion moves toward the elastic member.
9 more elements
An image forming apparatus comprising:
- an apparatus body including a first body-side engaging portion;
- an image formation unit configured to form an image on a recording sheet;
- and
- a belt unit including:
- a belt frame;
- a pair of rollers supported by the belt frame;
- an endless belt extending between the rollers, the rollers being spaced apart in a belt extending direction;
- a first belt-side engaging portion configured to engage the first body-side engaging portion;
- and
- an elastic member configured to urge one of the rollers in a direction away from the other one of the rollers to apply a tension to the endless belt and to urge the first belt-side engaging portion against the first body-side engaging portion in a specified direction away from the one of the rollers,
- wherein, when the first belt-side engaging portion disengages from the first body-side engaging portion, the elastic member continues to urge the one of the rollers such that the tension is applied to the endless belt.
8 more elements
Dependencies are inferred from the claim text.