Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorShoichi Kan
Life of this patent
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Abstract
An image forming apparatus for forming an image on a recording medium by a recording head includes a drive source rotatable in forward and reverse directions, and drive changeover means for transmitting the driving force of the drive source. The drive changeover means drives a first mechanism by the rotation of the drive source in the forward direction, drives a second mechanism by the rotation of the drive source in the reverse direction, and prevents the malfunctioning of the second mechanism even when the first mechanism is driven by the rotation of the drive source in the reverse direction.
Claims16
An image forming apparatus for forming an image on a recording medium by recording means including:
- a drive source rotatable in forward and reverse directions;
- and
- drive changeover means for transmitting the driving force of said drive source, said drive changeover means driving a first mechanism by the rotation of said drive source in the forward direction, driving a second mechanism by the rotation of said drive source in the reverse direction, and preventing the malfunctioning of said second mechanism even when said first mechanism is driven by the rotation of said drive source in the reverse direction.
An image forming apparatus for forming an image on a recording medium by recording means including:
- a conveying rotary member for conveying the recording medium;
- a drive source rotatable in forward and reverse directions, said drive source giving a rotatively driving force in a first direction to said conveying rotary member by being rotated in the forward direction, giving a rotatively driving force in a second direction opposite to said first direction to said conveying rotary member and giving a driving force to other driven portion by being rotated in the reverse direction;
- one-way drive transmitting means for transmitting the driving force to said driven portion when said drive source is rotated in the reverse direction;
- and
- a drive dead zone range by which said one-way drive transmitting means does not transmit the driving force of said drive source being rotated in the reverse direction to said driven portion for a predetermined time after the direction of rotation of said drive source is changed over from said forward direction to said reverse direction;
- wherein the amount of rotation of said drive source necessary to rotatively drive said conveying rotary member in said second direction to perform a predetermined operation is smaller than said drive dead zone range.
An image forming apparatus for forming an image on a recording medium by recording means including:
- a conveying rotary member rotatable in a first direction and a second direction opposite to said first direction to convey the recording medium;
- a cam mechanism rotatively driven to thereby effect the driving of a predetermined mechanism;
- a drive source for giving a rotatively driving force to said conveying rotary member and said cam mechanism;
- position detecting means for detecting the initial position of said cam mechanism with the rotation thereof;
- and
- one-way drive transmitting means for transmitting the rotatively driving force from said drive source to said cam mechanism when said conveying rotary member is rotated in said second direction;
- wherein when said one-way drive transmitting means transmits the driving force to said cam mechanism by the reverse rotation of said conveying rotary member, the position at which said cam mechanism is rotated by said transmission and stopped is within a range outside a range required for said position detecting means to detect the initial position of said cam mechanism.
Dependencies are inferred from the claim text.