Image forming apparatus having grounding of transfer material guide member
AssigneeCanon Kabushiki Kaisha
InventorKazuki Takase
Life of this patent
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Abstract
In an image forming apparatus, a transfer material transport guide is disposed in an optical sensor unit to support a color deviation sensor, which is disposed near an intermediate transfer belt. By changing the position of the optical sensor unit, the grounding path of the transfer material transport guide can be changed, and both transfer bias leak prevention for the transfer material transport guide and electrostatic breakdown prevention for the color deviation sensor can be implemented. As a result, the apparatus can be downsized, and when the intermediate transfer belt is replaced, the optical sensor unit can be moved to create a space necessary for the replacement.
Claims16
An image forming apparatus, comprising:
- an image bearing member configured to bear a toner image;
- a guide member configured to guide a transfer material to a transfer portion for transferring the toner image from the image bearing member to the transfer material;
- and
- an electric unit that comprises a device configured to be activated by electric power supply, wherein
- the electric unit is configured to move to a first position and to a second position that is more retracted from the image bearing member than the first position,
- the guide member is grounded via a resistance member when the electric unit is positioned at the first position,
- the guide member is grounded without the resistance member when the electric unit is positioned at the second position.
An image forming apparatus, comprising:
- an image bearing member configured to bear a toner image;
- a movable unit that comprises a device configured to be activated by electric power supply and a guide member configured to guide a transfer material to a transfer portion for transferring the toner image from the image bearing member to the transfer material, the movable unit is configured to move to a first position and to a second position that is more retracted from the image bearing member than the first position;
- a main body frame that comprises a conducting portion;
- an opening and closing member which is capable of being opened and closed relative to the main body frame, wherein movement of the movable unit between the first position and the second position is interlocked with movement in which the opening and closing member is opened and closed;
- and
- a displacement mechanism configured to displace the movable unit to the first position or to the second position and contact the movable unit,
- wherein when the movable unit is positioned at the second position according to the movement of the opening and closing member, the displacement mechanism is configured to contact the conducting portion directly to eliminate electricity from the moveable unit.
Dependencies are inferred from the claim text.