JP2015152613A5

JP2015152613A5 -

Info

Publication number: JP2015152613A5
Application number: JP2014023305A
Authority: JP
Filing date: 2014-02-10
Publication date: 2017-03-16
Anticipated expiration: 2034-02-10

Description

本発明は、記録媒体に画像を定着させる定着手段を有する画像形成装置に関する。 The present invention relates to an image forming apparatus having fixing means for fixing an image on a recording medium.

そこで、本発明は、加熱ユニットと加圧ユニットの圧接状態が長時間にわたることを防止するとともに、本体への定着手段の着脱を容易にすることができる画像形成装置を提供する。 Therefore, the present invention provides an image forming apparatus capable of preventing the press-contact state of the heating unit and the pressure unit from extending for a long time and easily attaching / detaching the fixing unit to / from the main body.

上記課題を解決するために、画像形成装置は、
記録媒体に画像を形成する画像形成手段と、
加熱ユニットと加圧ユニットを有し、前記記録媒体に画像を定着させる定着手段と、
前記加圧ユニットを前記加熱ユニットに当接および離間させる当接離間機構と、
前記定着手段を本体に着脱するための開口部に設けられた開閉部材と、
前記開閉部材の開閉を検知する検知手段と、
モータからの駆動力を受ける駆動力伝達機構と、
前記モータが第１方向に回転した場合に前記駆動力伝達機構と当接し前記駆動力伝達機構からの駆動力を前記当接離間機構に伝達し、前記モータが前記第１方向と異なる第２方向に回転した場合に前記駆動力伝達機構と離間する第１歯車と、
前記モータが前記第２方向に回転した場合に前記駆動力伝達機構と当接し前記駆動力伝達機構からの駆動力を前記定着手段に伝達し、前記モータが前記第１方向に回転した場合に前記駆動力伝達機構と離間する第２歯車と、
前記モータの駆動を制御する制御手段とを有し、
前記制御手段は、
画像を形成時は、前記モータを前記第２方向に回転させ、
前記検知手段が前記開閉部材の開状態を検知したことに応じて、前記加圧ユニットと前記加熱ユニットを離間させるために前記モータを前記第１方向に第１時間回転させ、その後前記モータを前記第２方向に第２時間（前記第２時間＜前記第１時間）回転させ、
画像形成が終了後、所定時間経過した場合に、前記加圧ユニットと前記加熱ユニットを離間させるために前記モータを前記第１方向に回転させる
ことを特徴とする。 In order to solve the above problems, an image forming apparatus includes:
Image forming means for forming an image on a recording medium;
A fixing unit having a heating unit and a pressure unit, and fixing an image on the recording medium;
A contact / separation mechanism that contacts and separates the pressure unit from the heating unit;
An opening and closing member provided in an opening for attaching and detaching the fixing unit to the main body;
Detecting means for detecting opening and closing of the opening and closing member;
A driving force transmission mechanism that receives the driving force from the motor;
When the motor rotates in the first direction, it contacts the driving force transmission mechanism and transmits the driving force from the driving force transmission mechanism to the contact / separation mechanism, and the motor is in a second direction different from the first direction. A first gear separated from the driving force transmission mechanism when rotated to
When the motor rotates in the second direction, it contacts the driving force transmission mechanism to transmit the driving force from the driving force transmission mechanism to the fixing means, and when the motor rotates in the first direction, A second gear separated from the driving force transmission mechanism;
Control means for controlling the drive of the motor,
The control means includes
When forming an image, rotate the motor in the second direction,
In response to the detection means detecting the open state of the opening / closing member, the motor is rotated in the first direction for a first time in order to separate the pressure unit and the heating unit, and then the motor is Rotate in a second direction for a second time (the second time <the first time),
The motor is rotated in the first direction in order to separate the pressure unit and the heating unit when a predetermined time has passed after the image formation is completed.

本発明によれば、加熱ユニットと加圧ユニットの圧接状態が長時間にわたることを防止するとともに、本体への定着手段の着脱を容易にすることができる。
According to the present invention, it is possible to prevent the heating unit and the pressure unit from being in pressure contact for a long time, and to easily attach and detach the fixing unit to the main body.

Claims

Image forming means for forming an image on a recording medium;
A fixing unit having a heating unit and a pressure unit, and fixing an image on the recording medium;
A contact / separation mechanism that contacts and separates the pressure unit from the heating unit;
An opening and closing member provided in an opening for attaching and detaching the fixing unit to the main body;
Detecting means for detecting opening and closing of the opening and closing member;
A driving force transmission mechanism that receives the driving force from the motor;
When the motor rotates in the first direction, it contacts the driving force transmission mechanism and transmits the driving force from the driving force transmission mechanism to the contact / separation mechanism, and the motor is in a second direction different from the first direction. A first gear separated from the driving force transmission mechanism when rotated to
When the motor rotates in the second direction, it contacts the driving force transmission mechanism to transmit the driving force from the driving force transmission mechanism to the fixing means, and when the motor rotates in the first direction, A second gear separated from the driving force transmission mechanism;
Control means for controlling the drive of the motor,
The control means includes
When forming an image, rotate the motor in the second direction,
In response to the detection means detecting the open state of the opening / closing member, the motor is rotated in the first direction for a first time in order to separate the pressure unit and the heating unit, and then the motor is Rotate in a second direction for a second time (the second time <the first time),
An image forming apparatus comprising: rotating a motor in the first direction to separate the pressure unit and the heating unit when a predetermined time has elapsed after completion of image formation.

The drive force transmission mechanism includes a first oscillating gear that can abut on the second gear and a second oscillating gear that can abut on the first gear. The image forming apparatus according to 1.

The control means includes
If it is determined that a command to turn off the power of the image forming apparatus is received, the motor is rotated in the first direction to separate the pressure unit and the heating unit by the contact / separation mechanism, and then the motor is turned off. 3. The image forming apparatus according to claim 1, wherein the image forming apparatus is rotated in the second direction for the second time, and then the power is turned off.

The control unit rotates the motor in the first direction to bring the pressure unit and the heating unit into contact with each other by the contact / separation mechanism. The image forming apparatus described in the item.