JP2007121759A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP2007121759A
JP2007121759A JP2005314952A JP2005314952A JP2007121759A JP 2007121759 A JP2007121759 A JP 2007121759A JP 2005314952 A JP2005314952 A JP 2005314952A JP 2005314952 A JP2005314952 A JP 2005314952A JP 2007121759 A JP2007121759 A JP 2007121759A
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temperature
image
adjustment
image forming
forming apparatus
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JP2005314952A
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Japanese (ja)
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Keisuke Shimizu
圭祐 清水
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority to JP2005314952A priority Critical patent/JP2007121759A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of obtaining stable images by efficiently suppressing the temperature rise in the apparatus body. <P>SOLUTION: The image forming apparatus is equipped with a temperature measuring means 2 of measuring the temperature in the primary apparatus body 10, a temperature control means 3 of controlling the temperature in the primary apparatus body 10, and an image adjusting means 4 of adjusting an image, and is further equipped with a control means 1 of making the temperature control means 3 control the temperature and the image adjusting means 4 adjust the image, when the temperature measurement result of the temperature measuring means 2 is higher than the set temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電子写真方式の画像形成装置に関する。   The present invention relates to an electrophotographic image forming apparatus.

複写機、プリンタ、ファクシミリ、これらの複合機などの画像形成装置には、モータや複数の基板類やヒータといった発熱する部品が多く搭載されている。安全規格上はもちろんのこと、安定した画像を提供するために、装置内部の温度をある一定値まで抑えることが求められている。特に現像装置、転写装置部内部または周囲の温度が上昇すると、トナー凝集、固着が発生し、トナーの大きさが不均一になることにより、トナー濃度がばらつき、不良画像が発生するという問題がある。
特許文献1記載の技術では、駆動電流を制御することで発熱を抑え温度を制御している。この他にも発熱源の一つである駆動源を制御したり、ファンの制御を工夫することで温度制御している技術が多く提案されている。
特開2004−102212公報
Image forming apparatuses such as copiers, printers, facsimile machines, and multi-function machines are equipped with a large number of heat generating components such as a motor, a plurality of substrates, and a heater. In addition to safety standards, in order to provide a stable image, it is required to suppress the temperature inside the apparatus to a certain value. In particular, when the temperature inside or around the developing device or the transfer device rises, toner aggregation and fixation occur, and the toner size becomes non-uniform, resulting in variations in toner density and defective images. .
In the technique described in Patent Document 1, the temperature is controlled by suppressing the heat generation by controlling the drive current. In addition to this, many techniques for controlling the temperature by controlling the drive source, which is one of the heat generation sources, and devising the control of the fan have been proposed.
JP 2004-102212 A

特許文献1に記載の画像形成装置では、温度制御方式として駆動電流を調整する方式を採用している。このとき駆動電流の調整値に対応して、クリーニングブレードの圧を変更し駆動負荷を調整している。しかし、クリーニングブレードの圧を変更することにより、クリーニング不良画像などが発生する可能性がある。また、ファンの制御方法を工夫することで温度を制御する場合は、高温時にファンの回転数を上げるように消費電力がアップする方向の制御がほとんどである。
本発明は、効率よく装置本体内部の温度上昇を抑制し、安定した画像を得ることができる画像形成装置を提供することを目的とする。
The image forming apparatus described in Patent Document 1 employs a method of adjusting a drive current as a temperature control method. At this time, the driving load is adjusted by changing the pressure of the cleaning blade in accordance with the adjustment value of the driving current. However, by changing the pressure of the cleaning blade, a defective cleaning image or the like may occur. Further, when controlling the temperature by devising a fan control method, most of the control is in the direction of increasing power consumption so as to increase the rotational speed of the fan at high temperatures.
An object of the present invention is to provide an image forming apparatus capable of efficiently suppressing a temperature rise inside the apparatus main body and obtaining a stable image.

上記目的を達成するために、請求項1記載の発明は、装置本体内の温度を計測する温度計測手段と、装置本体内の温度を調整する温度調整手段と、画像調整を行う画像調整手段と、前記温度計測手段による温度計測結果が設定温度以上の場合に前記温度調整手段に温度調整を行わせ、かつ前記画像調整手段に画像調整を行わせる制御手段と、備えたことを特徴とする。
請求項2記載の発明は、請求項1記載の画像形成装置において、前記制御手段は、両面連続印刷時のみ前記温度調整手段により温度調整を実行することを特徴とする。
In order to achieve the above object, the invention described in claim 1 includes a temperature measuring means for measuring the temperature in the apparatus main body, a temperature adjusting means for adjusting the temperature in the apparatus main body, and an image adjusting means for adjusting the image. And a control means for causing the temperature adjustment means to perform temperature adjustment when the temperature measurement result by the temperature measurement means is equal to or higher than a set temperature, and for causing the image adjustment means to perform image adjustment.
According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the control means performs temperature adjustment by the temperature adjusting means only during duplex continuous printing.

本発明の画像形成装置は、装置本体内の温度を計測する温度計測手段と、装置本体内の温度を調整する温度調整手段と、画像調整を行う画像調整手段とを備え、さらに、温度計測手段による温度計測結果が設定温度以上の場合に温度調整手段に温度調整を行わせ、かつ画像調整手段に画像調整を行わせる制御手段を備えたので、効率よく装置本体内部の温度上昇を抑制し、安定した画像を得ることができる。   The image forming apparatus of the present invention includes a temperature measuring unit that measures the temperature in the apparatus main body, a temperature adjusting unit that adjusts the temperature in the apparatus main body, and an image adjusting unit that performs image adjustment, and further includes a temperature measuring unit. When the temperature measurement result by is equipped with a control means that causes the temperature adjustment means to perform temperature adjustment and the image adjustment means to perform image adjustment when the temperature measurement result is equal to or higher than the set temperature, efficiently suppress the temperature rise inside the apparatus body, A stable image can be obtained.

以下、図面を参照して、本発明の実施形態を詳細に説明する。
図1は本発明の実施形態に係る画像形成装置の機能ブロック図である。制御手段(CPU)に対して、装置本体内の温度を計測する温度計測手段2と、装置本体内の温度を調整する温度調整手段3と、画像調整を行う画像調整手段4とを接続している。制御手段1は、温度計測手段2による温度計測結果が設定温度以上の場合に温度調整手段3に温度調整を行わせ、かつ画像調整手段4に画像調整を行わせる。
図2は本発明の実施形態に係る画像形成装置の概略構成図である。装置本体10の底部には、給紙部11があり、その上方に書き込みユニット12があり、さらにその上方には作像ユニット13がある。作像ユニット13で画像が転写された用紙は定着部14で画像が定着され、排紙部15に排紙されるようになっている。
本画像形成装置は、作像ユニット13を構成する作像カートリッジ16とレジストローラ17の間に余剰空間が形成されており、その空間に温度検出手段(温度センサ)2が設けられており、周囲雰囲気温度を随時計測している。温度センサ2は作像ユニット13の近傍の温度計測ができるため、トナーの凝集・固着によるトナー濃度のバラツキ、スジ画像の発生を防ぐことが可能となっている。
本画像形成装置は画像の安定性を図るために、ある印刷枚数ごとに3つの画像調整を行っている。1つ目はプロセス調整であり、2つ目は色ずれ調整であり、3つ目はフィルミング調整であり、ぼやけ画像の原因となるフィルミングを未然に防いでいる。これら画像調整は定期的なタイミングで実行される。
また画像調整時は通紙することなく、書き込みユニット12、作像ユニット13を構成する感光体18及び中間転写ベルト19のみが駆動している。この時、通紙されていないため、定着部14で暖められた空気は排紙口から放出し、機内(装置本体1)温度が低下する。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a functional block diagram of an image forming apparatus according to an embodiment of the present invention. A temperature measuring means 2 for measuring the temperature in the apparatus main body, a temperature adjusting means 3 for adjusting the temperature in the apparatus main body, and an image adjusting means 4 for performing image adjustment are connected to the control means (CPU). Yes. The control unit 1 causes the temperature adjustment unit 3 to perform temperature adjustment when the temperature measurement result by the temperature measurement unit 2 is equal to or higher than the set temperature, and causes the image adjustment unit 4 to perform image adjustment.
FIG. 2 is a schematic configuration diagram of the image forming apparatus according to the embodiment of the present invention. At the bottom of the apparatus main body 10 is a paper feed unit 11, above which is a writing unit 12, and above which is an image forming unit 13. The sheet on which the image is transferred by the image forming unit 13 is fixed by the fixing unit 14 and discharged to the paper discharge unit 15.
In this image forming apparatus, a surplus space is formed between the image forming cartridge 16 constituting the image forming unit 13 and the registration roller 17, and a temperature detecting means (temperature sensor) 2 is provided in the space, Atmospheric temperature is measured from time to time. Since the temperature sensor 2 can measure the temperature in the vicinity of the image forming unit 13, it is possible to prevent variations in toner density and generation of streak images due to toner aggregation and fixation.
The image forming apparatus performs three image adjustments for every certain number of printed sheets in order to stabilize the image. The first is process adjustment, the second is color misregistration adjustment, and the third is filming adjustment, and prevents filming that causes a blurred image. These image adjustments are executed at regular timing.
Further, only the photosensitive member 18 and the intermediate transfer belt 19 constituting the writing unit 12 and the image forming unit 13 are driven without passing paper during image adjustment. At this time, since the sheet is not passed, the air warmed by the fixing unit 14 is discharged from the sheet discharge port, and the temperature inside the apparatus (apparatus body 1) is lowered.

図3は図1に示す制御手段によってなされる制御動作のフローチャートである。印刷指令が入った時、温度センサ2により計測された温度Tがある設定温度T0より低ければ(S1)、定期的なタイミングで入れる画像調整を実行するタイミングかを判断する(S2)。そして画像調整を実行するタイミングでなければ印刷を実行する(S3)。
また、温度センサ2により計測された温度Tがある設定温度T0以上であれば(S1でN)、定期的なタイミングに関係なく画像調整を実行する(S4)。この時実行された画像調整のカウンタはクリアされる。
勿論この時、機内の温度が設定温度T0より低くなるよう、図1に示す温度調整手段3により温度調整がなされる。そして再び温度センサ2により計測された温度Tを設定温度T0と比較し、T0より低ければ、定期的なタイミングで入れる画像調整を実行するタイミングかを判断し、入れる必要がなければ印刷を開始する。印刷後、再び温度をチェックし、上記フローを繰り返す。
これにより、随時機内温度を画像不具合が生じないレベルで維持することが可能となる。また、温度調整に際し、画像調整も実行することにより、安定的な画像を提供することが可能となる。
FIG. 3 is a flowchart of the control operation performed by the control means shown in FIG. If the temperature T measured by the temperature sensor 2 is lower than a set temperature T0 when the print command is entered (S1), it is determined whether it is time to execute image adjustment that is entered at a regular timing (S2). If it is not time to execute image adjustment, printing is executed (S3).
If the temperature T measured by the temperature sensor 2 is equal to or higher than a certain set temperature T0 (N in S1), image adjustment is executed regardless of the regular timing (S4). The image adjustment counter executed at this time is cleared.
Of course, at this time, the temperature is adjusted by the temperature adjusting means 3 shown in FIG. 1 so that the temperature inside the apparatus becomes lower than the set temperature T0. Then, the temperature T measured by the temperature sensor 2 is again compared with the set temperature T0. If the temperature T is lower than T0, it is determined whether it is time to execute image adjustment at a regular timing. If it is not necessary, printing is started. . After printing, check the temperature again and repeat the above flow.
This makes it possible to maintain the in-flight temperature at a level that does not cause image defects. In addition, it is possible to provide a stable image by performing image adjustment when adjusting the temperature.

ここで温度調整制御を両面印刷時のみに適応してもよい。両面印刷時の場合、片面印刷され、定着部14通過により高温となった用紙が機内(の反転搬送路)を再び通過することにより、片面印刷時より機内の温度が上昇する。つまり本画像形成装置において最も温度が上昇する最悪モードである。
また、図3に示すフローで明らかなように、少なくとも設定された定期的なタイミングより短い間隔で画像調整が入る可能性が高いため、若干ダウンタイムが長くなる方向になる。そこで、温度上昇において最悪モードである両面印刷時にのみこの温度調整制御を適用することで、ダウンタイムを長くすることなく、機内の温度上昇を抑えることが可能となる。
Here, the temperature adjustment control may be applied only during duplex printing. In the case of double-sided printing, the single-sided printing paper that has become hot due to passage through the fixing unit 14 passes through the inside of the machine (the reverse conveyance path) again, so that the temperature inside the machine rises from that during single-sided printing. That is, this is the worst mode in which the temperature rises most in the image forming apparatus.
Further, as is apparent from the flow shown in FIG. 3, since there is a high possibility that image adjustment is performed at an interval shorter than at least the set regular timing, the downtime becomes slightly longer. Therefore, by applying this temperature adjustment control only during double-sided printing, which is the worst mode for temperature rise, it is possible to suppress the temperature rise in the apparatus without increasing downtime.

本発明の実施形態に係る画像形成装置の機能ブロック図である。1 is a functional block diagram of an image forming apparatus according to an embodiment of the present invention. 本発明の実施形態に係る画像形成装置の概略構成図である。1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention. 図1に示す制御手段によってなされる制御動作のフローチャートである。It is a flowchart of the control operation | movement performed by the control means shown in FIG.

符号の説明Explanation of symbols

1 制御手段
2 温度計測手段
3 温度調整手段
4 画像調整手段
DESCRIPTION OF SYMBOLS 1 Control means 2 Temperature measurement means 3 Temperature adjustment means 4 Image adjustment means

Claims (2)

装置本体内の温度を計測する温度計測手段と、装置本体内の温度を調整する温度調整手段と、画像調整を行う画像調整手段と、前記温度計測手段による温度計測結果が設定温度以上の場合に前記温度調整手段に温度調整を行わせ、かつ前記画像調整手段に画像調整を行わせる制御手段と、備えたことを特徴とする画像形成装置。   When the temperature measurement means for measuring the temperature in the apparatus main body, the temperature adjustment means for adjusting the temperature in the apparatus main body, the image adjustment means for adjusting the image, and the temperature measurement result by the temperature measurement means are equal to or higher than the set temperature An image forming apparatus comprising: a control unit that causes the temperature adjustment unit to perform temperature adjustment and that causes the image adjustment unit to perform image adjustment. 請求項1記載の画像形成装置において、前記制御手段は、両面連続印刷時のみ前記温度調整手段により温度調整を実行することを特徴とする画像形成装置。   2. The image forming apparatus according to claim 1, wherein the control unit performs temperature adjustment by the temperature adjusting unit only during continuous duplex printing.
JP2005314952A 2005-10-28 2005-10-28 Image forming apparatus Pending JP2007121759A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009020436A (en) * 2007-07-13 2009-01-29 Konica Minolta Business Technologies Inc Image forming apparatus and method of controlling the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009020436A (en) * 2007-07-13 2009-01-29 Konica Minolta Business Technologies Inc Image forming apparatus and method of controlling the same

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