JP2019101190A5

JP2019101190A5 -

Info

Publication number: JP2019101190A5
Application number: JP2017230995A
Authority: JP
Filing date: 2017-11-30
Publication date: 2020-12-03
Anticipated expiration: 2037-11-30

Description

上記課題に鑑み、本発明は、シートが回転体に貼り付いた状態で当該回転体が１回転してしまうことをより安価な構成で抑制することを目的とする。 In view of the above problems, it is an object of the present invention to prevent the rotating body from rotating once while the sheet is attached to the rotating body with a cheaper configuration .

上記課題を解決するために、本発明にかかる画像形成装置は、
シートに画像を形成する画像形成手段と、
ヒータと回転体とを備え、前記回転体によって前記シートを搬送しながら、前記画像形成手段によって当該シートに形成された前記画像を前記ヒータの熱によって当該シートに定着させる定着手段と、
前記回転体に隣接し且つ前記シートが搬送される搬送方向において前記回転体よりも下流側に設けられ、前記シートを搬送する搬送ローラと、
前記搬送ローラを駆動するモータと、
前記モータの回転子の回転位相を決定する位相決定手段と、
前記モータの回転子の目標位相を表す指令位相と前記位相決定手段によって決定された前記回転子の回転位相との偏差が小さくなるように、前記モータの巻線に流れる駆動電流を制御する第１制御手段と、
前記シートの搬送を制御する第２制御手段と、
前記モータの回転子にかかる負荷トルクに対応するパラメータの値の絶対値が所定値を超えると所定の信号を出力する出力手段と、
を有し、
前記回転体のニップ部から前記搬送ローラのニップ部までの距離は、前記回転体の周長よりも短く、
前記制御手段は、前記回転体と前記搬送ローラとが異なる速度で回転するように前記モータの巻線に流れる駆動電流を制御し、
前記第２制御手段は、前記シートの先端が前記回転体のニップ部よりも上流側の所定位置に到達してから所定時間が経過するまでの期間に前記所定の信号が前記出力手段から出力されない場合は前記シートの搬送を停止し、前記期間に前記所定の信号が前記出力手段から出力された場合は前記シートの搬送を継続し、
前記所定時間は、前記所定位置に到達した前記シートの先端が前記搬送ローラのニップ部に到達するのに要する時間よりも長く、且つ、前記所定位置に到達した前記シートの先端が、前記回転体のニップ部から前記搬送方向において前記回転体の周長分下流側の位置に到達するのに要する時間よりも短いことを特徴とする。 In order to solve the above problems, the image forming apparatus according to the present invention is
An image forming means for forming an image on a sheet and
A heater with a rotating body, while conveying the sheet by said rotary member, and a fixing means for fixing to the sheet the image formed on the sheet by the heat of the heater by said image forming means,
A transport roller that is adjacent to the rotating body and is provided on the downstream side of the rotating body in the transport direction in which the sheet is transported , and transports the sheet .
The motor that drives the transfer roller and
A phase determining means for determining the rotational phase of the rotor of the motor,
A first control that controls the drive current flowing through the winding of the motor so that the deviation between the command phase representing the target phase of the rotor of the motor and the rotation phase of the rotor determined by the phase determining means becomes small. Control means and
A second control means for controlling the transport of the sheet,
An output means that outputs a predetermined signal when the absolute value of the parameter value corresponding to the load torque applied to the rotor of the motor exceeds a predetermined value.
Have,
The distance from the nip portion of the rotating body to the nip portion of the transport roller is shorter than the peripheral length of the rotating body.
The control means controls the drive current flowing through the winding of the motor so that the rotating body and the transport roller rotate at different speeds.
In the second control means, the predetermined signal is not output from the output means during the period from when the tip of the sheet reaches the predetermined position on the upstream side of the nip portion of the rotating body until the predetermined time elapses. In that case, the transfer of the sheet is stopped, and when the predetermined signal is output from the output means during the period, the transfer of the sheet is continued.
The predetermined time is longer than the time required for the tip of the sheet that has reached the predetermined position to reach the nip portion of the transport roller, and the tip of the sheet that has reached the predetermined position is the rotating body. It is characterized in that it is shorter than the time required to reach a position on the downstream side by the peripheral length of the rotating body in the transport direction from the nip portion of the above .

本発明によれば、シートが回転体に貼り付いた状態で当該回転体が１回転してしまうことをより安価な構成で抑制することができる。 According to the present invention, it is possible to prevent the rotating body from rotating once while the sheet is attached to the rotating body with a cheaper configuration .

Claims

An image forming means for forming an image on a sheet and
A heater with a rotating body, while conveying the sheet by said rotary member, and a fixing means for fixing to the sheet the image formed on the sheet by the heat of the heater by said image forming means,
A transport roller that is adjacent to the rotating body and is provided on the downstream side of the rotating body in the transport direction in which the sheet is transported , and transports the sheet .
The motor that drives the transfer roller and
A phase determining means for determining the rotational phase of the rotor of the motor,
A first control that controls the drive current flowing through the winding of the motor so that the deviation between the command phase representing the target phase of the rotor of the motor and the rotation phase of the rotor determined by the phase determining means becomes small. Control means and
A second control means for controlling the transport of the sheet,
An output means that outputs a predetermined signal when the absolute value of the parameter value corresponding to the load torque applied to the rotor of the motor exceeds a predetermined value.
Have,
The distance from the nip portion of the rotating body to the nip portion of the transport roller is shorter than the peripheral length of the rotating body.
The control means controls the drive current flowing through the winding of the motor so that the rotating body and the transport roller rotate at different speeds.
In the second control means, the predetermined signal is not output from the output means during the period from when the tip of the sheet reaches the predetermined position on the upstream side of the nip portion of the rotating body until the predetermined time elapses. In that case, the transfer of the sheet is stopped, and when the predetermined signal is output from the output means during the period, the transfer of the sheet is continued.
The predetermined time is longer than the time required for the tip of the sheet that has reached the predetermined position to reach the nip portion of the transport roller, and the tip of the sheet that has reached the predetermined position is the rotating body. An image forming apparatus characterized in that it is shorter than the time required to reach a position on the downstream side by the peripheral length of the rotating body in the transport direction from the nip portion of the above .

An image forming means for forming an image on a sheet and
A heater with a rotating body, while conveying the sheet by said rotary member, and a fixing means for fixing to the sheet the image formed on the sheet by the heat of the heater by said image forming means,
A transport roller that is adjacent to the rotating body and is provided on the downstream side of the rotating body in the transport direction in which the sheet is transported , and transports the sheet .
The motor that drives the transfer roller and
A speed determining means for determining the rotational speed of the rotor of the motor, and
A first control that controls the drive current flowing through the winding of the motor so that the deviation between the command speed representing the target speed of the rotor of the motor and the rotation speed of the rotor determined by the speed determining means becomes small. Control means and
A second control means for controlling the transport of the sheet,
An output means that outputs a predetermined signal when the absolute value of the parameter value corresponding to the load torque applied to the rotor of the motor exceeds a predetermined value.
Have,
The distance from the nip portion of the rotating body to the nip portion of the transport roller is shorter than the peripheral length of the rotating body.
The control means controls the drive current flowing through the winding of the motor so that the rotating body and the transport roller rotate at different speeds.
In the second control means, the predetermined signal is not output from the output means during the period from when the tip of the sheet reaches the predetermined position on the upstream side of the nip portion of the rotating body until the predetermined time elapses. In that case, the transfer of the sheet is stopped, and when the predetermined signal is output from the output means during the period, the transfer of the sheet is continued.
The predetermined time is longer than the time required for the tip of the sheet that has reached the predetermined position to reach the nip portion of the transport roller, and the tip of the sheet that has reached the predetermined position is the rotating body. An image forming apparatus characterized in that it is shorter than the time required to reach a position on the downstream side by the peripheral length of the rotating body in the transport direction from the nip portion of the above .

The image according to claim 1 or 2, wherein the control means controls a drive current flowing through the winding of the motor so that the peripheral speed of the transfer roller becomes faster than the peripheral speed of the rotating body. Forming device.

The second control means controls the supply of electric power to the heater.
The second control means according to any one of claims 1 to 3, wherein the supply of electric power to the heater is stopped when the predetermined signal is not output from the output means during the period. Image forming device.

The image forming apparatus according to any one of claims 1 to 4 , wherein the image forming apparatus has a notification means for notifying that an abnormality has occurred in transporting a sheet when the predetermined signal is not output from the output means during the period. The image forming apparatus according to any one of the following items.

The image forming apparatus according to any one of claims 1 to 5 , wherein the rotating body is driven by a second motor different from the motor.

The motor drives the transport roller and the rotating body.
The output means obtains the load torque after the absolute value of the parameter value corresponding to the load torque changes from a value smaller than the second predetermined value smaller than the predetermined value to a value larger than the second predetermined value. The invention according to any one of claims 1 to 5 , wherein when the absolute value of the value of the corresponding parameter changes from a value smaller than the predetermined value to a value larger than the predetermined value, the predetermined signal is output. Image forming device.

The image forming apparatus according to any one of claims 1 to 7 , wherein the rotating body is a fixing roller that fixes the image to the sheet by heat.

The image forming apparatus according to any one of claims 1 to 8 , wherein the parameter corresponding to the load torque is the deviation.

The image forming apparatus has a detecting means for detecting a drive current flowing through the winding.
The control means applies to the windings based on a torque current component that generates torque in the rotor, which is represented in a rotating coordinate system based on the rotation phase of the rotor determined by the phase determining means. Control the flowing drive current,
One of claims 1 or any of claims 3 to 8 quoting claim 1, wherein the parameter corresponding to the load torque is a value of the torque current component of the drive current detected by the detection means. The image forming apparatus according to claim 1.

The control means applies to the windings based on a torque current component that generates torque in the rotor, which is represented in a rotating coordinate system based on the rotation phase of the rotor determined by the phase determining means. Control the flowing drive current,
The image forming apparatus according to claim 1, wherein the parameter corresponding to the load torque is a target value of the torque current component, or any one of claims 3 to 8 quoting claim 1.

The image forming apparatus
A phase determining means for determining the rotational phase of the rotor and
It has a detecting means for detecting the drive current flowing through the winding.
The control means applies to the windings based on a torque current component that generates torque in the rotor, which is represented in a rotating coordinate system based on the rotation phase of the rotor determined by the phase determining means. Control the flowing drive current,
The parameter corresponding to the load torque is any of claims 2 or 3 to 8 quoting claim 2, wherein the parameter corresponds to the value of the torque current component of the drive current detected by the detection means. The image forming apparatus according to claim 1.

The image forming apparatus has a phase determining means for determining the rotational phase of the rotor.
The control means applies to the windings based on a torque current component that generates torque in the rotor, which is represented in a rotating coordinate system based on the rotation phase of the rotor determined by the phase determining means. Control the flowing drive current,
The image forming apparatus according to claim 2, wherein the parameter corresponding to the load torque is a target value of the torque current component, or any one of claims 3 to 8 quoting claim 2.