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US 2004/0165901 A1Published application
Transferring apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYasuhiro Nakata, Hisashi Nakahara
Life of this patent
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Abstract
To provide a transferring apparatus, it is possible to perform switching between a high mode and a low mode in a transfer voltage generator circuit of a transferring apparatus by using a microcomputer. The high mode is a mode in which a positive transfer voltage generator circuit is operated independently, and a voltage generated by the positive transfer voltage generator circuit is output as a transfer voltage. The low mode is a mode in which the positive transfer voltage generator circuit and a negative transfer voltage generator circuit are both operated, and the voltages generated by each of the circuits are superimposed and output as the transfer voltage.
Claims14
A transferring apparatus comprising:
- a transferring member applied with a transfer voltage for transferring a toner image on an image bearing member to a recording material;
- a positive voltage generating portion that generates a positive-polarity voltage that is applied to the transferring member;
- a negative voltage generating portion that generates a negative-polarity voltage that is applied to the transferring member;
- and
- a control portion that controls the transfer voltage applied to the transferring member, the control portion controlling the positive voltage generating portion and the negative voltage generating portion, wherein:
- the control portion performs control in a first mode adapted to generate the transfer voltage by superimposing the negative-polarity voltage and the positive-polarity voltage in a case where the transfer voltage applied to the transferring member is smaller than a predetermined threshold voltage;
- and
- the control portion performs control in a second mode adapted to generate the transfer voltage from the positive-polarity voltage, without superimposing the negative-polarity voltage, in a case where the transfer voltage applied to the transferring member is larger than the predetermined threshold voltage.
5 more elements
A transferring apparatus comprising:
- a transferring member applied with a transfer voltage for transferring a toner image on an image bearing member to a recording material;
- a positive-voltage generating portion that generates a positive-polarity voltage that is applied to the transferring member;
- a negative-voltage generating portion that generates a negative-polarity voltage that is applied to the transferring member;
- and
- a control portion that controls the positive-polarity generating portion and the negative-polarity generating portion, the control portion performing control in a first mode where the transfer voltage is generated by superimposing the negative-polarity voltage and the positive-polarity voltage, and in a second mode where the transfer voltage is generated from the positive-polarity voltage without superimposing the negative-polarity voltage, wherein:
- the control portion switches from the first mode to the second mode in a case where the transfer voltage applied to the transferring member is changed into a voltage that is larger than a predetermined threshold voltage from a voltage that is smaller than the predetermined threshold voltage;
- and
- the control portion switches from the second mode to the first mode in a case where the transfer voltage applied to the transferring member is changed into a voltage that is smaller than a predetermined threshold voltage from a voltage that is larger than the predetermined threshold voltage.
5 more elements
A transferring apparatus comprising:
- a transferring member applied with a transfer voltage for transferring a toner image on an image bearing member to a recording material;
- a first voltage generating portion that generates a voltage having a predetermined polarity, which is applied to the transferring member;
- a second voltage generating portion that generates a voltage having a polarity opposite to the predetermined polarity, which is applied to the transferring member;
- and
- a control portion that controls the transfer voltage applied to the transferring member, the control portion controlling the first voltage generating portion and the second voltage generating portion,
- wherein the control portion has a first control mode where the transfer voltage is generated by superimposing the voltage of the predetermined polarity and the voltage of the opposite polarity, and a second control mode where the transfer voltage is generated from the voltage of the predetermined polarity without superimposing the voltage of the opposite polarity.
3 more elements
Dependencies are inferred from the claim text.