JP4713944B2 - Heater lamp control device - Google Patents

Heater lamp control device Download PDF

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JP4713944B2
JP4713944B2 JP2005155457A JP2005155457A JP4713944B2 JP 4713944 B2 JP4713944 B2 JP 4713944B2 JP 2005155457 A JP2005155457 A JP 2005155457A JP 2005155457 A JP2005155457 A JP 2005155457A JP 4713944 B2 JP4713944 B2 JP 4713944B2
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heater lamp
voltage
heater
power
power supply
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JP2006330454A (en
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川崎　　和彦
達夫 松田
竜一 助川
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Ricoh Co Ltd
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本発明は、プリンタや複写機などの電子写真式印刷装置におけるヒータランプ制御装置に関するものである。   The present invention relates to a heater lamp control device in an electrophotographic printing apparatus such as a printer or a copying machine.

従来のヒータランプ制御装置について図１の概略構成図と図２のタイミングチャートを用いて説明する。   A conventional heater lamp control device will be described with reference to the schematic configuration diagram of FIG. 1 and the timing chart of FIG.

図１により、ヒータランプ制御装置の概略構成を説明する。図１の概略構成図は、プリンタや複写機などの電子写真式印刷装置の一部を示すものであり、本発明に大きく関与しない部位については省略して示してある。   A schematic configuration of the heater lamp control device will be described with reference to FIG. The schematic configuration diagram of FIG. 1 shows a part of an electrophotographic printing apparatus such as a printer or a copying machine, and parts that are not greatly related to the present invention are omitted.

外部電源設備より供給される交流給電１０より印刷装置１４の直流電力を賄う低圧電源９に給電される。パワーオンスイッチ１１がオンすると、低圧電源９は印刷装置１４全体の制御を行う制御基板８に直流電圧を給電する。また、交流給電１０は用紙上に載ったトナーを加圧・加熱し、用紙に定着させるヒートロール１と加圧ロール４からなる定着部を加熱するヒータランプ２、ヒータランプ３への給電オン、オフを行うヒータドライバ５や装置内の清掃などを行う交流ブロア１２に給電する交流供給リレー７へ給電される。   Power is supplied to the low voltage power supply 9 that covers the DC power of the printing apparatus 14 from the AC power supply 10 supplied from the external power supply facility. When the power-on switch 11 is turned on, the low-voltage power supply 9 supplies a DC voltage to the control board 8 that controls the entire printing apparatus 14. The AC power supply 10 pressurizes and heats the toner placed on the paper and heats the fixing unit including the heat roll 1 and the pressure roll 4 for fixing the paper on the paper. The power supply to the heater lamp 3 is turned on. Power is supplied to the AC supply relay 7 that supplies power to the heater driver 5 that turns off and the AC blower 12 that cleans the inside of the apparatus.

ヒータドライバ５は、一方の相をヒータランプ２及びヒータランプ３へ接続し、もう一方の相をヒータランプ切替リレー６に接続する。また、ヒータドライバ５へのヒータランプオン・オフは、図示しないヒートロール温度センサ信号によってヒートロール１の表面温度が一定に保たれるよう制御基板８からの制御信号によって制御される。ヒータランプ切替リレー６は、ヒータランプ２とヒータランプ３を切り替えるスイッチ素子であり、ここでは１Ｃタイプの接点構成を有するリレーを示す。印刷する用紙幅等によって、ヒータランプ２とヒータランプ３は選択され、切替は制御基板８によって選択・制御される。   The heater driver 5 connects one phase to the heater lamp 2 and the heater lamp 3 and connects the other phase to the heater lamp switching relay 6. The heater lamp on / off to the heater driver 5 is controlled by a control signal from the control board 8 so that the surface temperature of the heat roll 1 is kept constant by a heat roll temperature sensor signal (not shown). The heater lamp switching relay 6 is a switch element that switches between the heater lamp 2 and the heater lamp 3, and shows a relay having a 1C type contact configuration here. The heater lamp 2 and the heater lamp 3 are selected depending on the paper width to be printed, and the switching is selected and controlled by the control board 8.

次に、図２のタイミングチャートにより動作を説明する。Ｈ／Ｌで示す各信号は全て”Ｈ”で意味ありを示す。   Next, the operation will be described with reference to the timing chart of FIG. All the signals indicated by H / L are “H” and have meaning.

パワーオンスイッチ１１をオフするとＰｏｗｅｒ Ｏｎ−Ｐ信号がＬになる（状態１）。その後、低圧電源９の出力電圧である＋５Ｖ電圧が降下し、４．２５Ｖになると制御基板８内のリセット回路が動作し、Ｒｅｓｅｔ−Ｐ信号が”Ｈ”となる（状態２）。Ｒｅｓｅｔ信号が”Ｈ”になると、制御基板８内の回路が初期化されるため、ヒータランプ切替リレー６は初期状態となる。ここで、ヒータランプ切替リレー６が１Ｃタイプの接点構成を有し、ノーマリーオープン（ＮＯ）端子側に接点が接続されている状態（図２のＬａｍｐ Ｂ側の状態）の場合、回路が初期化されるとノーマリークローズ（ＮＣ）端子側に接点が移動する。この時ヒータランプ２は冷えている状態であるため、大きな突入電流であるＹ（Ａ）の電流が流れる。大きな突入電流が流れるとヒータランプ切替リレー６の接点に大きな電流が流れ接点にダメージを与えてしまう。   When the power-on switch 11 is turned off, the Power On-P signal becomes L (state 1). Thereafter, the + 5V voltage, which is the output voltage of the low-voltage power supply 9, drops, and when it reaches 4.25V, the reset circuit in the control board 8 operates and the Reset-P signal becomes “H” (state 2). When the Reset signal becomes “H”, the circuit in the control board 8 is initialized, so that the heater lamp switching relay 6 is in an initial state. Here, when the heater lamp switching relay 6 has a 1C type contact configuration and the contact is connected to the normally open (NO) terminal side (the state on the Lamp B side in FIG. 2), the circuit is in the initial state. When it is changed, the contact moves to the normally closed (NC) terminal side. At this time, since the heater lamp 2 is in a cold state, a large inrush current Y (A) flows. When a large inrush current flows, a large current flows through the contact of the heater lamp switching relay 6 and damages the contact.

ここで、パワーオンスイッチ１１をオフしても、ヒータドライバ５への交流給電が遮断されない要因としては、ヒータランプへの駆動をオフしても電流が流れつづけるような駆動回路を有する場合（例えば、特許文献１参照）や、図１に示すように、ヒータドライバ８と同じ交流接続系統に交流ブロア１２のようにモータ回転中に交流給電を遮断しても直ぐに停止できない負荷が有る場合は、パワーオンスイッチ１１をオフしても一定期間交流が供給され続け大きな突入電流が発生する要因となる。   Here, even if the power-on switch 11 is turned off, the reason why the AC power supply to the heater driver 5 is not interrupted is that there is a drive circuit in which current continues to flow even if the drive to the heater lamp is turned off (for example, 1), or as shown in FIG. 1, in the same AC connection system as the heater driver 8, there is a load that cannot be stopped immediately even if AC power supply is interrupted during motor rotation, such as the AC blower 12, Even if the power-on switch 11 is turned off, alternating current is continuously supplied for a certain period, which causes a large inrush current.

特開２０００−１５０１１０号公報JP 2000-150110 A

従来のヒータランプ制御装置は、ヒータランプへの通電中にパワーオン／オフスイッチによって装置が遮断された場合、通電中にリレーが反転し、冷えたヒータランプに通電することとなる。この場合、ヒータランプは冷えているため大きな突入電流が流れることになり、ヒータランプ切替リレーが溶着するなどのダメージを与える原因となっていた。   In the conventional heater lamp control device, when the device is interrupted by the power on / off switch while the heater lamp is energized, the relay is reversed during the energization and the cooled heater lamp is energized. In this case, since the heater lamp is cold, a large inrush current flows, causing damage such as welding of the heater lamp switching relay.

また、ヒータランプへの給電と同じ系統にブロアなどの負荷が接続されている場合、交流給電を遮断しても、ブロアによって発電された電圧が生じる場合も、リレーが切り替わることで突入電流が流れることがあった。   In addition, when a load such as a blower is connected to the same system as the power supply to the heater lamp, an inrush current flows by switching the relay even when AC power supply is interrupted and a voltage generated by the blower is generated. There was a thing.

上記課題は、パワーオン／オフスイッチ等によって電源が遮断された場合、低圧電源などによって供給される制御用電圧が降下し、制御不能になる前にヒータランプへの通電をオフすると共に、制御用電圧が降下する際にリレーが切り替わらないように信号を固定することにより解決される。   The above problem is that when the power supply is cut off by a power on / off switch or the like, the control voltage supplied by the low voltage power supply or the like drops, and the heater lamp is turned off before it becomes uncontrollable. The solution is to fix the signal so that the relay does not switch when the voltage drops.

本発明のヒータランプ制御装置によれば、複数のヒータランプを有しヒータランプをリレーなどのスイッチ素子で切り替えて使用するプリンタや複写機などの装置を、印刷中や印刷待機中に関わらず装置使用者が装置の電源を遮断しても、スイッチ素子を大型化することなく、ヒータランプの容量に適したスイッチ素子を用いることが出来る。また、スイッチ素子へのダメージ（リレーを使用する場合には接点の溶着などを起こすダメージ）を与えることが無い。これにより信頼性の高い装置を提供することが出来る。   According to the heater lamp control device of the present invention, a device such as a printer or a copier that has a plurality of heater lamps and is used by switching the heater lamp with a switching element such as a relay can be used regardless of whether it is printing or waiting for printing. Even if the user shuts off the power supply of the apparatus, the switch element suitable for the capacity of the heater lamp can be used without increasing the size of the switch element. Further, there is no damage to the switch element (damage of contact welding or the like when a relay is used). Thereby, a highly reliable device can be provided.

以下に、本発明の実施例を図１、図３、図４を用いて説明する。   Embodiments of the present invention will be described below with reference to FIGS.

図３は、本発明の一実施例を示すタイミングチャートでありＨ／Ｌで示す各信号は全て”Ｈ”で意味ありを示す。なお、図１は前述したので詳細な説明は省略する。   FIG. 3 is a timing chart showing an embodiment of the present invention, and all signals indicated by H / L are meaningful with “H”. In addition, since FIG. 1 was mentioned above, detailed description is abbreviate | omitted.

パワーオンスイッチ１１がオフされ、Ｐｏｗｅｒ Ｏｎ−Ｐ信号が”Ｌ”になると、低圧電源９よりＰｒｅ−Ｐｏｗｅｒ ＯＦＦ−Ｐ信号が発行され、”Ｈ”となる。Ｐｒｅ−Ｐｏｗｅｒ ＯＦＦ−Ｐ信号は、低圧電源９の＋５Ｖが降下する２０（ｍｓ）以上前に”Ｈ”となる（状態３）。Ｐｒｅ−Ｐｏｗｅｒ ＯＦＦ−Ｐ信号を受け取った制御基板８は、交流供給リレー７を駆動する図示しないトランジスタにてオフする。これにより交流Ｉｎｐｕｔ Ｒｅｌａｙ
ＯＮ−Ｐ信号は”Ｌ”となり、ヒータドライバ５及び交流ブロア１２への交流給電を遮断する。ヒータドライバ５への交流給電が遮断されると、ヒータランプ３に流れていた電流（Ｈｅａｔｅｒ Ｌａｍｐ Ｃｕｒｒｅｎｔ１）は流れなくなる。 When the power-on switch 11 is turned off and the Power On-P signal becomes “L”, the Pre-Power OFF-P signal is issued from the low voltage power source 9 and becomes “H”. The Pre-Power OFF-P signal becomes “H” 20 minutes or more before +5 V of the low-voltage power supply 9 drops (state 3). The control board 8 that has received the Pre-Power OFF-P signal is turned off by a transistor (not shown) that drives the AC supply relay 7. As a result, AC Input Relay
The ON-P signal becomes “L”, and the AC power supply to the heater driver 5 and the AC blower 12 is cut off. When the AC power supply to the heater driver 5 is interrupted, the current (Heather Lamp Current 1) flowing through the heater lamp 3 does not flow.

ここで、交流供給リレー７は、通常時はヒータドライバ５及び交流ブロア１２への交流電圧の供給を行っており、また、印刷装置１４のインタロックスイッチ１３がオフされた時に、装置操作者への感電などの危険を与えないようヒータランプ２，３等への給電を遮断するリレーを兼ねている。   Here, the AC supply relay 7 normally supplies an AC voltage to the heater driver 5 and the AC blower 12, and when the interlock switch 13 of the printing apparatus 14 is turned off, to the apparatus operator. It also serves as a relay that cuts off the power supply to the heater lamps 2, 3 and the like so as not to give a risk of electric shock.

その後、低圧電源９の＋５Ｖ電圧が降下し、制御基板８内のＲｅｓｅｔ回路がＲｅｓｅｔ−Ｐ信号を発行しても、ヒータドライバ５へは通電していないため突入電流が流れることは無い（状態４）。   Thereafter, even if the + 5V voltage of the low-voltage power supply 9 drops and the Reset circuit in the control board 8 issues a Reset-P signal, the heater driver 5 is not energized, so no inrush current flows (state 4 ).

状態４は、本実施例では印刷装置１４が印刷停止中（交流ブロア１２が停止中）の場合であり、また交流ブロア１２等の交流給電を遮断しても、直ぐに回転を停止しない機器が接続されていない装置の場合を示す（ケース１）。   State 4 is a case where the printing apparatus 14 is in a printing stop state (the AC blower 12 is stopped) in the present embodiment, and a device that does not stop rotating immediately even if the AC power supply such as the AC blower 12 is cut off is connected. A case of a device that has not been performed is shown (case 1).

一方、ケース２では印刷装置１４が印刷中や印刷起動時またはパワーオン直後の初期状態時のようにブロア１２が回転している時にパワーオンスイッチ１１をオフし、ヒータドライバ５への給電が遮断されても、交流ブロア１２が回転している為、交流ブロア１２が発電機となりヒータドライバ５への交流電圧が供給される状態となる。この場合、Ｒｅｓｅｔ−Ｐ信号が入力された時のヒータランプ切替リレー６の状態を保持する回路を制御基板８内に設ける。   On the other hand, in case 2, the power-on switch 11 is turned off when the blower 12 is rotating, such as when the printing device 14 is printing, when printing starts, or in the initial state immediately after power-on, and the power supply to the heater driver 5 is cut off. Even so, since the AC blower 12 is rotating, the AC blower 12 becomes a generator, and an AC voltage is supplied to the heater driver 5. In this case, a circuit for holding the state of the heater lamp switching relay 6 when the Reset-P signal is input is provided in the control board 8.

ヒータランプ切替リレー６の状態を保持する回路の一例とタイミングチャートを図４に示す。詳細な説明は省略するが、Ｒｅｓｅｔ−Ｐ信号が変化しＨｅａｔｅｒ Ｓｅｌｅｃｔ Ｂ−Ｐ信号が変化しても、Ｈｅａｔｅｒ Ｓｅｌｅｃｔ Ｒｅｌａｙ信号はＨｅａｔｅｒ Ｂを選択した状態を保持する。   An example of a circuit for holding the state of the heater lamp switching relay 6 and a timing chart are shown in FIG. Although a detailed description is omitted, even if the Reset-P signal changes and the Heater Select BP signal changes, the Heater Select Relay signal retains the state in which Heater B is selected.

この回路によりパワーオンスイッチ１１をオフした後もヒータランプ切替リレー６が切り替わることが無いため突入電流を発生させることは無く、図３のＨｅａｔｅｒ Ｌａｍｐ Ｃｕｒｒｅｎｔ２に示すように交流Ｉｎｐｕｔ Ｒｅｌａｙ ＯＮ−Ｐが”Ｌ”になって以降は、交流ブロア１２の回転低下と共に電流が低下する。   Since the heater lamp switching relay 6 is not switched even after the power-on switch 11 is turned off by this circuit, no inrush current is generated. As shown in the Heater Lamp Current 2 in FIG. 3, the AC Input Relay ON-P is “ After becoming L ″, the current decreases as the rotation of the AC blower 12 decreases.

本発明のヒータランプ制御装置の概略構成を示す図である（実施例１）。It is a figure which shows schematic structure of the heater lamp control apparatus of this invention (Example 1). 従来のヒータランプ制御装置を示すタイミングチャートである。It is a timing chart which shows the conventional heater lamp control apparatus. 本発明のヒータランプ制御装置のタイミングチャートである（実施例１）。(Example 1) which is a timing chart of the heater lamp control apparatus of this invention. 本発明のヒータランプ制御装置の制御回路及びタイミングチャートである（実施例１）。(Example 1) which is the control circuit and timing chart of the heater lamp control apparatus of this invention.

符号の説明Explanation of symbols

１はヒートロール、２はヒータランプ、３はヒータランプ、４は加圧ロール、５はヒータドライバ、６はヒータランプ切替リレー、７は交流供給リレー、８は制御基板、９は低圧電源、１０は交流給電電源、１１はパワーオンスイッチ、１２は交流ブロア、１３はインタロックスイッチ、１４は印刷装置である。
1 is a heat roll, 2 is a heater lamp, 3 is a heater lamp, 4 is a pressure roll, 5 is a heater driver, 6 is a heater lamp switching relay, 7 is an AC supply relay, 8 is a control board, 9 is a low-voltage power supply, 10 Is an AC power supply, 11 is a power-on switch, 12 is an AC blower, 13 is an interlock switch, and 14 is a printing apparatus.

Claims (2)

用紙上のトナーを熱によって定着するヒートロールと、該ヒートロールに熱を与える複数のヒータランプと、印刷する用紙の幅によって使用する前記ヒータランプを切り替えるリレーであるスイッチ素子と、直流電圧の給電を行う低電圧電源の直流電圧が低下すると自動的に前記リレーを初期状態とするＲｅｓｅｔ信号を発行するＲｅｓｅｔ回路を有する制御基板と、前記ヒータランプへの給電のオンオフを行うヒータランプ駆動回路を有する電子写真式印刷装置において、
前記直流電圧の給電が低下した時、前記制御基板が前記Ｒｅｓｅｔ信号を発行する前にＰｒｅ−Ｐｏｗｅｒ ＯＦＦ信号が出力され、前記ヒータランプ駆動回路は、前記Ｐｒｅ−Ｐｏｗｅｒ ＯＦＦ信号によって電源からの交流電圧が遮断されても、交流電圧が供給される状態となっており、前記制御基板は、前記Ｒｅｓｅｔ信号が発行されても前記スイッチ素子の状態を保持することを特徴とする電子写真式印刷装置。 A heat roll for fixing toner on paper by heat, a plurality of heater lamps for applying heat to the heat roll, a switch element that is a relay for switching the heater lamp to be used depending on the width of the paper to be printed, and DC voltage feeding And a control board having a reset circuit that automatically issues a reset signal that causes the relay to be in an initial state when the DC voltage of the low-voltage power supply decreases, and a heater lamp driving circuit that turns on and off the power supply to the heater lamp. In an electrophotographic printing apparatus,
When the supply of the DC voltage is reduced, a Pre-Power OFF signal is output before the control board issues the Reset signal, and the heater lamp driving circuit receives an AC voltage from a power source by the Pre-Power OFF signal. It is but is cut off, and a state in which the AC voltage is supplied, the control board, before Symbol Reset signal electrophotographic printing apparatus characterized by holding the state of the switching element be issued . 前記Ｐｒｅ−Ｐｏｗｅｒ ＯＦＦ信号を発行する回路は前記低電圧電源内に実装、生成されることを特徴とする請求項１記載の電子写真式印刷装置。   2. The electrophotographic printing apparatus according to claim 1, wherein the circuit that issues the Pre-Power OFF signal is mounted and generated in the low-voltage power supply.
JP2005155457A 2005-05-27 2005-05-27 Heater lamp control device Expired - Fee Related JP4713944B2 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07114293A (en) * 1993-10-19 1995-05-02 Canon Inc Fixing device
JPH07319341A (en) * 1994-05-25 1995-12-08 Canon Inc Image forming device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07114293A (en) * 1993-10-19 1995-05-02 Canon Inc Fixing device
JPH07319341A (en) * 1994-05-25 1995-12-08 Canon Inc Image forming device

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