JP4964558B2 - Fixing device - Google Patents

Fixing device Download PDF

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JP4964558B2
JP4964558B2 JP2006286291A JP2006286291A JP4964558B2 JP 4964558 B2 JP4964558 B2 JP 4964558B2 JP 2006286291 A JP2006286291 A JP 2006286291A JP 2006286291 A JP2006286291 A JP 2006286291A JP 4964558 B2 JP4964558 B2 JP 4964558B2
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valve
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peeling
pipe
air
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JP2008102408A (en
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道雄 横須賀
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Ricoh Co Ltd
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Description

本発明は、複写機、プリンタなどの画像形成装置に於いて、記録体に形成されたトナー画像を定着する定着装置に関するものである。   The present invention relates to a fixing device for fixing a toner image formed on a recording medium in an image forming apparatus such as a copying machine or a printer.

図６は、従来の定着装置を説明するものである。電子写真装置の定着装置として、金属ロールの内部にヒータランプを設けた加熱ロールと、それに相接する表面にゴム層を有する加圧ロールの間を通過させ加熱圧力定着する定着装置が知られており、従来から複写機、プリンタ等において使用されている。   FIG. 6 illustrates a conventional fixing device. Known as a fixing device for an electrophotographic apparatus is a fixing device for fixing a heating pressure by passing between a heating roll provided with a heater lamp inside a metal roll and a pressure roll having a rubber layer on the surface adjacent to the heating roll. Conventionally, it has been used in copying machines, printers, and the like.

上記の加熱ロールとして、アルミまたは鋼材の円筒の表面上にプライマー層を設け、その上にＰＦＡ（テトラフルオロエチレン・パーフルオロアルキルビニールエーテル共重合体）やＰＴＦＥ（ポリテトラフルオロエチレン）等の離型性樹脂層を設けた加熱ロール、いわゆるハードロールと、アルミ円筒上にプライマー層を設け、その上に厚さが０．１ｍｍより厚いシリコーンゴムやふっ素ゴム等の弾性体層を設けた弾性加熱ロールいわゆるソフトロールが知られている。また、電子写真装置の多機能化により、両面印刷が行われている。両面印刷のため、加圧ロールの内部にはヒータランプが設けられ、２本の加熱ロールによる両面同時定着が行われている。
As the heating roll, a primer layer is provided on the surface of a cylinder of aluminum or steel, and a mold release such as PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) or PTFE (polytetrafluoroethylene) is provided thereon. Heating roll provided with a functional resin layer , a so-called hard roll, and an elastic heating roll provided with a primer layer on an aluminum cylinder and an elastic layer such as silicone rubber or fluoro rubber having a thickness of more than 0.1 mm thereon So-called soft rolls are known. Further, double-sided printing is performed due to the multi-functionality of the electrophotographic apparatus. For double-sided printing, a heater lamp is provided inside the pressure roll, and double-sided fixing is performed by two heating rolls.

ソフトロール１は、金属ロール２の表面にシリコーンゴムの弾性体層３を形成した。ソフトロール５は、金属ロール６にシリコーンゴムの弾性体層７を形成した。両ソフトロールの金属ロール２、６の内部にはヒータランプ４，８を設けた。また、弾性体層３，７の表面には、離型性を向上させるため、ＰＦＡやＰＴＦＥ等の離型性樹脂層（図示せず）を形成する場合がある。
The soft roll 1 has a silicone rubber elastic body layer 3 formed on the surface of a metal roll 2 . The soft roll 5 was formed by forming an elastic body layer 7 of silicone rubber on the metal roll 6. Heater lamps 4 and 8 were provided inside the metal rolls 2 and 6 of both soft rolls. In addition, a release resin layer (not shown) such as PFA or PTFE may be formed on the surfaces of the elastic layers 3 and 7 in order to improve the release properties.

しかし、印刷用紙３０は、ソフトロール１，５によって形成される溶融挟持部３２を通過して定着される際、溶融したトナー３１の粘性により、ソフトロール１または５の表面に巻き付く場合がある。そのため、一般には、ソフトロール１，５には、表面に接触または一定の間隙を有する剥離爪３３，３４を設け、印刷用紙３０を剥離する用紙剥離手段がある。
However, the printing paper 30, when it is fixed through the molten clamping portion 32 which is formed by a soft roll 1,5, there are cases where the viscosity of the toner 31 was melted, it wraps around the surface of the soft roll 1 or 5 . Therefore, in general, the soft rolls 1 and 5 are provided with peeling claws 33 and 34 having contact with the surface or having a certain gap, and have a paper peeling means for peeling the printing paper 30.

ところが、この用紙剥離手段には以下の問題がある。剥離爪３３，３４をソフトロール１，５表面に接触させた場合、剥離爪３３，３４によるソフトロール１，５の磨耗、または、傷が生じ易い。また、剥離爪３３，３４がソフトロール１，５と一定の間隙を有する場合、印刷用紙３０が間隙をすり抜けて、剥離ミスが生じることがある。
However, this sheet peeling means has the following problems. If the peeling claw 33, 34 into contact with the soft roll 1, 5 surface, the peeling claw 33, 34 soft roll 1 by, 5 wear, or likely to occur scratches. In addition, when the peeling claws 33 and 34 have a certain gap with the soft rolls 1 and 5, the printing paper 30 may pass through the gap and a peeling error may occur.

この対策として、剥離爪３３，３４と、印刷用紙３０に空気を吹き付けるエアー剥離を組み合わせた用紙剥離手段がある。この用紙剥離手段の構成を図６に示した。剥離爪３３，３４は、ソフトロール１，５と一定の間隙を有する位置に設け、剥離爪３３の内部には管路１１、剥離爪３４の内部には管路１２が設けられ、管路２３と管路１１、管路２４と管路１２は接続している。
 As a countermeasure against this , there is a sheet peeling means that combines the peeling claws 33 and 34 and air peeling for blowing air to the printing paper 30. The configuration of the sheet peeling means is shown in FIG. The peeling claws 33 , 34 are provided at positions having a certain gap with the soft rolls 1 , 5, the pipe 11 is provided inside the peeling claw 33, the pipe 12 is provided inside the peeling claw 34, and the pipe 23 And the pipeline 11 and the pipeline 24 and the pipeline 12 are connected.

検知器２６は、時計（図示せず）、発光部２８と受光部２７を有し、発光部２８から出射された光線２９が印刷用紙３０によって遮光された時刻を測定する。弁制御部２５は、検知器２６の時刻情報を基に、印刷用紙３０の先端部が、溶融挟持部３２から搬出される時間を計算し、弁制御信号を、信号線１９，２１によって伝え、管路２３，２４に設けた弁１７，２０を、用紙の搬送時間から計算した、剥離に要する時間だけ開き、圧力容器３５の空気圧を、管路１１，１２の出口から空気流として噴出することによって、印刷用紙３０は、ソフトロール１または５から剥離される。この時、印刷用紙３０の先端部はエアー剥離によって、それより後部は剥離爪３３，３４によって剥離される（例えば、特許文献１参照）。
The detector 26 includes a clock (not shown), a light emitting unit 28 and a light receiving unit 27, and measures the time when the light beam 29 emitted from the light emitting unit 28 is shielded by the printing paper 30. Based on the time information of the detector 26, the valve control unit 25 calculates the time when the leading end of the printing paper 30 is unloaded from the melting and clamping unit 32, and transmits the valve control signal through the signal lines 19 , 21. The valves 17 and 20 provided in the pipelines 23 and 24 are opened only for the time required for separation calculated from the paper transport time, and the air pressure of the pressure vessel 35 is ejected from the outlets of the pipelines 11 and 12 as an air flow. Thus, the printing paper 30 is peeled from the soft roll 1 or 5. At this time, the front end portion of the printing paper 30 is peeled off by air, and the rear portion thereof is peeled off by peeling claws 33 and 34 (see, for example, Patent Document 1 ).

特開平８−５４８０１号公報 （第６頁、図６)JP-A-8-54801 (Page 6, FIG. 6)

しかし、エアー剥離に於いて、印刷用紙３０の先端部が、溶融挟持部３２出口から、剥離爪３３または３４の剥離面の固定位置に達するまでの搬送時間が、剥離に要する時間Ｔ１であり、この時間だけ弁１７，２０を開け、印刷用紙３０に空気流を吹き付けた。しかし、実際は、剥離に要する時間の間、弁１７，２０を開口した後に、管路１１，２３と管路１２，２４の中には残圧が生じ、それが出口から空気流になって噴出した。この空気流によって、加熱ロール表面は冷却され、定着温度の低下となり、これに対しヒーター４，８のＯＮ時間を長くすることにより対処するが、消費電力量が増える。また、定着温度の低下が生じた時に、コールドオフセットやそれによる剥離ミスが生じることがある。
However, in the air peeling, the transport time from when the leading end of the printing paper 30 reaches the fixing position of the peeling surface of the peeling claw 33 or 34 from the outlet of the melt sandwiching part 32 is a time T1 required for peeling, During this time, the valves 17 and 20 were opened, and an air flow was blown onto the printing paper 30. However, in actuality, after the valves 17 and 20 are opened for the time required for separation, residual pressure is generated in the pipes 11 and 23 and the pipes 12 and 24, and the air flows out from the outlet. did. This air flow cools the surface of the heating roll and lowers the fixing temperature. This can be dealt with by increasing the ON time of the heaters 4 and 8, but the power consumption increases. In addition, when the fixing temperature is lowered, a cold offset or a peeling error may occur.

本発明の目的は、消費電力の節減及び安定した定着性の確保、剥離ミス低減等が可能な電子写真装置を提供することにある。   An object of the present invention is to provide an electrophotographic apparatus capable of reducing power consumption, ensuring stable fixing properties, reducing peeling errors, and the like.

前記目的を達成するため、加熱ロールと、加圧ロールまたは加熱ロールからなり、相接することにより溶融挟持部を形成し、用紙のトナー画像を定着する定着ロール対と、前記溶融挟持部の出口側の加熱ロールの表面に付着した用紙に空気を噴出する剥離用管路と、剥離部材と、前記剥離用管路の開閉をする第１の弁と、前記剥離用管路に空気圧を供給する圧力供給部と、を有する定着装置において、前記剥離用管路の空気噴出口近傍に接続される、第２の弁を有する排気用管路と、前記溶融挟持部の入口側に設けられる用紙検知部と、該用紙検知部の信号に基づき、前記溶融挟持部から用紙先端が搬出される時刻Ｔｓを算出し、前記第１の弁、第２の弁の開閉を制御する弁制御部とを有し、該弁制御部は、前記第１の弁が時刻Ｔｓに開口されてから閉口するまでの時間をＴ０とし、前記時刻Ｔｓから用紙剥離に要する時刻Ｔｔまでの時間をＴ１とし、前記時刻Ｔｓから前記空気噴出口の空気噴出を終了する時刻Ｔｍまでの時間をＴ２とすると、時刻Ｔｔから時間（Ｔ２−Ｔ１）の間、前記第２の弁を開口し、常圧となった後に閉口することを特徴とする。
To achieve the above object, the pressurized hot roll, consist pressure roll or heating roll, a molten nipping portion formed by contact with each, and a fixing roll pair for fixing a toner image of the sheet of the melt holding portions Supplying air pressure to the peeling pipe, a peeling pipe that blows air onto the sheet attached to the surface of the heating roll on the outlet side, a peeling member, a first valve that opens and closes the peeling pipe, in the fixing device having a pressure supply unit, a to said connected adjacent air ejection port of the separation conduit, the exhaust conduit having a second valve is provided on the inlet side of the molten holding portions paper A detection unit, and a valve control unit that calculates a time Ts when the leading end of the sheet is carried out of the fusing unit based on a signal from the sheet detection unit, and controls opening and closing of the first valve and the second valve. And the valve control unit opens the first valve at time Ts. The time from the time Ts to the closing time is T0, the time from the time Ts to the time Tt required for sheet separation is T1, and the time from the time Ts to the time Tm when the air ejection from the air outlet ends is T2. then, from time Tt time (T2-T1), and opening the second valve, characterized in that closed after a normal pressure.

また、前記剥離用管路を複数個設け、それらの出口を定着ロール軸方向において異なる位置に設けたことを特徴とする。Further, a plurality of the separation pipes are provided, and their outlets are provided at different positions in the fixing roll axial direction.

また、前記空気圧を供給する管路と前記剥離用管路の接続部と、前記空気圧を供給する管路と前記排気用管路の接続部との圧力損失が、前者に比べ後者が小さい接続であることを特徴とする。Further, the pressure loss between the pipe supplying the air pressure and the separation pipe, and the pressure loss between the pipe supplying the air pressure and the connection between the exhaust pipe is smaller in the latter than in the former. It is characterized by being.

また、一対の加熱ロールからなり、相接することにより溶融狭持部を形成し、用紙のトナー画像を定着する定着ロール対と、空気を噴出する剥離用管路、剥離部材、前記剥離用管路を開閉する弁を、前記溶融狭持部の用紙搬送方向下流側で、且つ、前記定着ロール対の各ロールに対してそれぞれ設け、前記剥離用管路それぞれに空気圧を供給する圧力供給部を有し、前記剥離用管路の空気噴出口の近傍に排気用管路をそれぞれ接続し、該排気用管路はそれぞれ該排気用管路を開閉する弁を備え、一方の加熱ロールに対するエアー剥離部の前記剥離用管路の空気噴出口は、他方の加熱ロールの前記剥離用管路の空気噴出口に対し、前記定着ロール対の軸方向において異なる位置となるように設けたことを特徴とする。更に、前記溶融狭持部の用紙搬送方向上流側に用紙検知部を設け、用紙検知部からの用紙検知信号に基づき、前記剥離用管路の各々の弁を、用紙先端が前記溶融狭持部を出てから剥離に要する時間だけ開口し、且つ、前記剥離用管路の各々の弁の閉口時に、前記排気用管路の弁をそれぞれ開口することを特徴とする。Also, a pair of heating rolls that form a melt sandwiching part by contacting each other and fix a toner image on a sheet, a pair of fixing rolls for ejecting air, a peeling pipe, a peeling member, and the peeling pipe A pressure supply unit that provides a valve for opening and closing the path downstream of the fusing and sandwiching unit in the sheet conveying direction and for each roll of the fixing roll pair, and supplies air pressure to each of the separation pipes Each of the exhaust pipes is connected to an air outlet in the vicinity of the air outlet, and each of the exhaust pipes includes a valve for opening and closing the exhaust pipe, The air outlet of the peeling pipe of the part is provided so as to be at a different position in the axial direction of the fixing roll pair with respect to the air outlet of the peeling pipe of the other heating roll. To do. Furthermore, a paper detection unit is provided on the upstream side of the melt sandwiching part in the paper transport direction. Based on a paper detection signal from the paper detection unit, each valve of the peeling pipe is connected to the melt sandwiching part. The valve is opened only for the time required for peeling after leaving, and the valve of the exhaust pipe is opened when each valve of the peeling pipe is closed.

本発明の定着装置によれば、エアー剥離の際、用紙剥離後に、定着ロール表面に流れる無駄吹きが少なくなることにより、定着ロール表面温度の低下が小さくなり、消費電力の節減及び安定した定着性の確保、剥離ミスの低減などが可能となり、画像形成装置の信頼性が高まる。   According to the fixing device of the present invention, when air is peeled, after the paper is peeled off, waste blowing that flows on the surface of the fixing roll is reduced, so that the temperature drop of the fixing roll is reduced, power consumption is reduced, and stable fixing properties Can be ensured, peeling errors can be reduced, and the reliability of the image forming apparatus is increased.

前述のように複写機、プリンタ等の電子写真装置（画像形成装置）の信頼性を高める目的は、剥離爪を有する定着装置のエアー用紙剥離にて、剥離用管路の出口近傍に、第２の弁を有する排気用管路を接続し、剥離用管路の第１の弁を、一定時間開いた後に生じる残圧のうち、剥離に必要としない残圧を、第２の弁を無駄吹きする時間開くことにより排出し、定着ロール表面への無駄吹きを少なくすること、複数個の剥離用管路の出口を、定着ロールの軸方向にて、異なる位置に設けることにより実現する。
As described above, the purpose of improving the reliability of an electrophotographic apparatus (image forming apparatus) such as a copying machine or a printer is to remove the second air sheet in the vicinity of the outlet of the peeling pipe by peeling the air sheet of the fixing device having a peeling claw. connect the exhaust pipe having a valve, the first valve of the separation conduit, out of the residual pressure that occurs after opening a predetermined time, the residual pressure does not require the peeling, wasted the second valve This is realized by opening the blowing time to reduce the wasteful blow to the surface of the fixing roll, and by providing outlets of a plurality of peeling pipes at different positions in the axial direction of the fixing roll.

図１〜５及び表１は、本発明の実施例を説明するものである。電子写真装置の定着装置として、金属ロールの内部にヒータランプを設けた加熱ロールと、それに相接する表面にゴム層を有する加圧ロールの間を通過させ加熱圧力定着する定着装置が知られており、従来から複写機、プリンタ等において使用されている。   1 to 5 and Table 1 illustrate examples of the present invention. Known as a fixing device for an electrophotographic apparatus is a fixing device for fixing a heating pressure by passing between a heating roll provided with a heater lamp inside a metal roll and a pressure roll having a rubber layer on the surface adjacent to the heating roll. Conventionally, it has been used in copying machines, printers, and the like.

上記の加熱ロールとして、アルミまたは鋼材の円筒の表面上にプライマー層を設け、その上にＰＦＡやＰＴＦＥ等の離型性樹脂層を設けた加熱ロール、いわゆるハードロールと、アルミ円筒上にプライマー層を設け、その上に厚さが０．１ｍｍより厚いシリコーンゴムやふっ素ゴム等の弾性体層を設けた弾性加熱ロールいわゆるソフトロールが知られている。また、電子写真装置の多機能化により、両面印刷が行われている。両面印刷のため、加圧ロールの内部にヒータランプが設けられ、２本の加熱ロールによる両面同時定着が行われている。
As the heating roll, a heating roll provided with a primer layer on the surface of a cylinder of aluminum or steel and a release resin layer such as PFA or PTFE provided thereon , a so-called hard roll, and a primer layer on the aluminum cylinder There is known an elastic heating roll, so-called soft roll, provided with an elastic layer such as silicone rubber or fluoro rubber having a thickness of more than 0.1 mm. Further, double-sided printing is performed due to the multi-functionality of the electrophotographic apparatus. For double-sided printing, a heater lamp is provided inside the pressure roll, and double-sided fixing is performed by two heating rolls.

図１に、両面同時定着の定着装置の構成を示した。ソフトロール１は、金属ロール２の表面にシリコーンゴムの弾性体層３を形成した。ソフトロール５は、金属ロール６にシリコーンゴムの弾性体層７を形成した。両ソフトロールの金属ロール２，６の内部にはヒータランプ４，８を設けた。また、弾性体層３，７の表面には、離型性を向上させるため、ＰＦＡやＰＴＦＥ等の離型性樹脂層（図示せず）を形成する場合がある。
FIG. 1 shows the configuration of a fixing device for simultaneous fixing on both sides. The soft roll 1 has a silicone rubber elastic body layer 3 formed on the surface of a metal roll 2. The soft roll 5 was formed by forming an elastic body layer 7 of silicone rubber on the metal roll 6. Heater lamps 4 and 8 were provided inside the metal rolls 2 and 6 of both soft rolls. In addition, a release resin layer (not shown) such as PFA or PTFE may be formed on the surfaces of the elastic layers 3 and 7 in order to improve the release properties.

しかし、印刷用紙３０が、ソフトロール１，５によって形成される溶融挟持部３２を通過して定着される際、溶融したトナー３１の粘性により、ソフトロール１または５の表面に貼り付く場合がある。そのため、ロール表面に対し、一定の間隙を有する剥離爪９，１０を設けた。本実施例では、間隙の大きさを、実機相当の１ｍｍに設定した。しかし、剥離爪９，１０のみでは、印刷用紙３０が間隙をすり抜けて、剥離ミスが生じることがあるため、印刷用紙３０に空気を吹き付けて剥離するエアー剥離を組み合わせた用紙剥離手段を採用した。
However, when the printing paper 30 is fixed by passing through the melt sandwiching portion 32 formed by the soft rolls 1 and 5, the printing paper 30 may stick to the surface of the soft roll 1 or 5 due to the viscosity of the melted toner 31. . Therefore, peeling nails 9 and 10 having a certain gap are provided on the roll surface. In this example, the size of the gap was set to 1 mm, which is equivalent to the actual machine. However, only the peeling claws 9 and 10 may cause the printing paper 30 to pass through the gap and cause a peeling error. Therefore, a paper peeling means that combines air peeling that blows air onto the printing paper 30 to employ peeling is employed.

その用紙剥離手段の定着装置の構成を図１に示した。剥離爪９の内部には管路１１、 剥離爪１０の内部には管路１２を設けた。本実施例に於いては、管路１１，１２を剥離爪９，１０の内部に設けたが、管路１１，１２を剥離爪９，１０の側面に隣接させることも可能である。また、管路１１，１２の空気流の出口は、ソフトロール１，５の表面の冷却を軽減するため、図３のようにソフトロール１，５の軸方向に異なる位置に設けた。圧縮空気を管路に供給する圧力容器３５には管路２３，２４を接続し、夫々の管路に弁１７，２０を設けた。弁１７，２０の制御は、弁制御部２５により、弁制御信号を信号線１９，２１に伝えて行う。管路２３には管路１１、管路２４には管路１２を接続した。管路１１と管路２３の接続部付近に管路１３を設け、管路１２と管路２４の接続部近傍に管路１４を設け、管路１３に弁１５、管路１４に弁１６を設けた。弁１５，１６の開閉は、弁制御部２５により制御信号を信号線１８，２２に伝えて行う。
The configuration of the fixing device of the sheet peeling means is shown in FIG. A pipe line 11 is provided inside the peeling claw 9 and a pipe line 12 is provided inside the peeling claw 10. In this embodiment, the pipes 11 and 12 are provided inside the peeling claws 9 and 10, but the pipes 11 and 12 can be adjacent to the side surfaces of the peeling claws 9 and 10. Further, the outlet of the conduit 11, 12 an air flow in order to reduce the cooling of the soft roll 1, 5 of the surface, provided at different positions in the axial direction of the soft roll 1, 5 as shown in FIG. Lines 23 and 24 were connected to a pressure vessel 35 for supplying compressed air to the lines, and valves 17 and 20 were provided in the respective lines. The valves 17 and 20 are controlled by transmitting a valve control signal to the signal lines 19 and 21 by the valve control unit 25. The pipeline 11 is connected to the pipeline 23, and the pipeline 12 is connected to the pipeline 24. A pipe line 13 is provided in the vicinity of a connection part between the pipe line 11 and the pipe line 23, a pipe line 14 is provided in the vicinity of a connection part between the pipe line 12 and the pipe line 24, a valve 15 is provided in the pipe line 13, and a valve 16 is provided in the pipe line 14. Provided. The valves 15 and 16 are opened and closed by transmitting a control signal to the signal lines 18 and 22 by the valve control unit 25.

ここで、図２のように、管路２３には管路１１、管路２４には管路１２を、夫々ほぼ直角なる角度に接続してもよい。管路１１と管路２３の接続部付近の、管路２３に管路１３をほぼ真直ぐに接続し、管路１２と管路２４の接続部近傍の、管路２４に管路１４をほぼ真直ぐに接続することにより、接続部での圧力損失を、管路２３と管路１３、管路２４と管路１４に比べ、管路２３と管路１１、管路２４と管路１２の接続部より小さくした。尚、管路１３に弁１５、管路１４に弁１６を設けた。
Here, as shown in FIG. 2, the pipe line 11 may be connected to the pipe line 23, and the pipe line 12 may be connected to the pipe line 24 at substantially right angles. The pipe line 13 is connected almost straight to the pipe line 23 near the connection part between the pipe line 11 and the pipe line 23, and the pipe line 14 is almost straightened to the pipe line 24 near the connection part between the pipe line 12 and the pipe line 24. , The pressure loss at the connection portion is compared with the pipeline 23 and the pipeline 13, the pipeline 24 and the pipeline 14, and the connection portion between the pipeline 23 and the pipeline 11, and the pipeline 24 and the pipeline 12. Made smaller. In addition, a valve 15 was provided in the pipeline 13 and a valve 16 was provided in the pipeline 14.

次にエアー剥離の動作原理を説明する。検知器２６は時計（図示せず）、発光部２８と受光部２７を有し、発光部２８から出射された光線２９が印刷用紙３０によって遮光された時刻を測定する。弁制御部２５は、検知器２６の時刻情報を基に、印刷用紙３０の先端部が、溶融挟持部３２から搬出される時間を演算部（図示せず）にて計算し、弁制御信号を信号線１９，２１によって弁駆動部（図示せず）に伝え、弁１７，２０を剥離に要する時間だけ開く。圧力容器３５内の圧縮空気（２気圧）は、管路１１，１２の出口から空気流として噴出されることによって、印刷用紙３０はソフトロール１または５から剥離される。この時、印刷用紙３０の先端部はエアー剥離によって、それより後部は剥離爪９，１０によって剥離される。本実施例では、剥離爪４３，４４はエアー剥離を行わない。このエアー剥離に於いて、無駄吹きのない、弁１５，１６の制御時間を求めた。
Next, the operating principle of air separation will be described. The detector 26 includes a clock (not shown), a light emitting unit 28 and a light receiving unit 27, and measures the time when the light beam 29 emitted from the light emitting unit 28 is blocked by the printing paper 30. Based on the time information of the detector 26, the valve control unit 25 calculates the time during which the leading end of the printing paper 30 is unloaded from the melting and clamping unit 32 by a calculation unit (not shown), and outputs a valve control signal. The signal lines 19 and 21 are transmitted to a valve driving unit (not shown), and the valves 17 and 20 are opened for the time required for peeling. Compressed air (2 atm) in the pressure vessel 35 is ejected from the outlets of the pipelines 11 and 12 as an air flow, whereby the printing paper 30 is peeled from the soft roll 1 or 5. At this time, the front end portion of the printing paper 30 is peeled off by air, and the rear portion thereof is peeled off by the peeling claws 9 , 10. In the present embodiment, the peeling claws 43 and 44 do not perform air peeling. In this air separation, the control time of the valves 15 and 16 without wasteful blowing was determined.

エアー剥離に於いて、印刷用紙３０の先端部が、溶融挟持部３２出口から剥離爪９または１０の剥離面の固定位置に達するまでの搬送時間を、剥離に要する時間Ｔ１とし、この時間だけ印刷用紙３０に空気流を吹き付ける。しかし、実際は、弁１７，２０を剥離に要する時間の間開口した後には、管路１１，２３と管路１２，２４の中に残圧が生じ、それが出口から空気流になって噴出する。この現象を実験装置にて確認した。
In the air peeling, the transport time from the exit of the printing paper 30 to the fixing position of the peeling surface of the peeling claw 9 or 10 from the outlet of the fusion pinching part 32 is defined as a time T1 required for peeling, and printing is performed only for this time. An air stream is blown onto the paper 30. However, in actuality, after the valves 17 and 20 are opened for the time required for separation, residual pressure is generated in the pipes 11 and 23 and the pipes 12 and 24, and the air flows from the outlet and is ejected. . This phenomenon was confirmed with an experimental apparatus.

その実験装置の構成図を図４に示した。圧力容器４２(圧力＝２気圧)に管路３８を接続した。管路３８の出口から１５００ｍｍ後の位置に弁３７を設け、制御部３６，４０によって弁３７の開閉を制御した。管路３８の出口から１ｍｍの位置に圧力計３９を設け、記録計４１にて記録した。これにより、弁３７の制御時間、及び、管路３８の出口の圧力と時間の関係を求めた。その結果を図５及び表１に示した。
A block diagram of the experimental apparatus is shown in FIG. A pipe line 38 was connected to the pressure vessel 42 (pressure = 2 atm). A valve 37 was provided at a position after 1500 mm from the outlet of the pipe line 38, and the opening and closing of the valve 37 was controlled by the control units 36 and 40. A pressure gauge 39 was provided at a position 1 mm from the outlet of the pipe 38 and recorded by a recorder 41. Thereby, the control time of the valve 37 and the relationship between the pressure at the outlet of the pipe line 38 and time were obtained. The results are shown in FIG.

Figure 0004964558
Figure 0004964558

弁３７が時刻Ｔｓに開口されてから閉口するまでの時間をＴ０とし、開いている制御時間Ｔ０を弁動作の応答時間を考慮して２０ｍｓに設定した。前記時刻Ｔｓから用紙剥離に要する時刻Ｔｔまでの時間をＴ１（＝６７ｍｓ）とし、前記時刻Ｔｓから前記管路３８の出口の空気圧が常圧になる時刻Ｔｍまでの時間をＴ２とすると、時刻Ｔｔからの無駄吹きしている時間（Ｔ２−Ｔ１）を測定した結果、表１に示したように、前記時間（Ｔ２−Ｔ１）は７３ｍｓであった。
The time until the valve 37 is closed after being opened to the time Ts and T 0, and sets the control time T0 that are open 20 ms in consideration of the response time of the valve operation. If the time from the time Ts to the time Tt required for sheet separation is T1 (= 67 ms), and the time from the time Ts to the time Tm at which the air pressure at the outlet of the pipe line 38 is normal pressure is T2 , the time Tt waste blown to that time (T2- T1) result of measurement of the from, as shown in Table 1, the time (T2- T1) was 73ms.

図１の定着機による用紙剥離の際は、時刻Ｔｓに管路２３，２４の弁１７，２０を開口し、時間Ｔ１経過後に弁１７，２０を閉じ、管路１３，１４の弁１５，１６を時間（Ｔ２−Ｔ１）の間開口することにより、残圧を減圧することが可能となった。尚、弁１５，１６は時間（Ｔ２−Ｔ１）経過後、常圧となったなら閉口する。よって、定着ロールの表面温度の低下は軽減された。
At the time Ts, the valves 17 and 20 of the pipe lines 23 and 24 are opened at the time Ts, and the valves 17 and 20 are closed after the lapse of time T1 , and the valves 15 and 16 of the pipe lines 13 and 14 are closed. the by opening during the time (T2- T1), it becomes possible to depressurize the residual pressure. Incidentally, the valve 15, 16 is time (T2- T1) after and closed if became normal pressure. Therefore, the decrease in the surface temperature of the fixing roll was reduced.

また、図２の構成によれば、管路１３，１４の弁１５，１６を開口した時、管路２３，２４の空気流は、管路１１，１２に比べ、圧力損失が小さい管路１３，１４に多く流れ、管路１１，１２の残圧による空気流を減らすことが可能となった。よって、定着ロールの表面温度の低下が軽減された。
Further, according to the configuration of FIG. 2, when the valves 15 , 16 of the pipes 13 , 14 are opened , the air flow in the pipes 23 , 24 has a smaller pressure loss than the pipes 11 , 12. , 14, and the air flow due to the residual pressure in the pipes 11 , 12 can be reduced. Therefore, the decrease in the surface temperature of the fixing roll was reduced.

本発明のレーザプリンタ等のエアー剥離の定着装置によれば、用紙剥離後に定着ロール表面に流れる無駄吹きが少なくなり、定着ロール表面温度の低下が小さくなり、消費電力の節減、また、表面温度の低下が生じた時に生じるコールドオフセットや、それによる剥離ミスを減らすことが可能となり、その利用効果は高く、プリンタ、複写機の印刷機械メーカーにおいて利用の可能性はある。
According to the air peeling fixing device of the present invention, such as a laser printer, waste blowing that flows on the surface of the fixing roll after paper peeling is reduced, the decrease in the temperature of the fixing roll is reduced, the power consumption is reduced, and the surface temperature is reduced. reduced Turkey over field offset and occurring when produced, it becomes possible to reduce it by stripping miss, the utilization effect is high, the printer, there is a potential use in the copying machine printing machine manufacturer.

本発明の実施形態に係る定着装置の概略図である。1 is a schematic view of a fixing device according to an embodiment of the present invention. 本発明の実施形態に係る定着装置の概略図である。1 is a schematic view of a fixing device according to an embodiment of the present invention. 本発明の実施形態に係る定着装置のエアー剥離の位置を示す図である。FIG. 4 is a diagram illustrating a position of air separation of the fixing device according to the embodiment of the present invention. エアー剥離現象実験装置を示す概略図である。It is the schematic which shows an air peeling phenomenon experimental apparatus. エアー剥離の圧力と時間の関係を示す図である。It is a figure which shows the relationship between the pressure of air peeling, and time. 従来例に係る定着装置の概略図である。It is a schematic diagram of a fixing device according to a conventional example.

符号の説明Explanation of symbols

１：ソフトロール、２：金属ロール、３：弾性体層、４：ヒータランプ、５：ソフトロール、６：金属ロール、７：弾性体層、８：ヒータランプ、９：剥離爪、１０：剥離爪、１１：管路、１２：管路、１３：管路、１４：管路、１５：弁、１６：弁、１７：弁、１８：信号線、１９：信号線、２０：弁、２1：信号線、２２：信号線、２３：管路、２４：管路、２５：弁制御部、２６：検知器、２７：受光部、２８：発光部、２９：光線、３０：印刷用紙、３１：トナー画像、３２：溶融挟持部、３３：剥離爪、３４：剥離爪、３５：圧力容器、３６：制御部、３７：弁、３８：管路、３９：圧力計、４０：制御部、４１：記録計、４２：圧力容器、４３：剥離爪、４４：剥離爪。
1: soft roll, 2: metal roll, 3: elastic layer, 4: heater lamp, 5: soft roll, 6: metal roll, 7: elastic layer, 8: heater lamp, 9: peeling claw, 10: peeling Nail, 11: pipeline, 12: pipeline, 13: pipeline, 14: pipeline, 15: valve, 16: valve, 17: valve, 18: signal line, 19: signal line, 20: valve, 21: Signal line, 22: Signal line, 23: Pipe line, 24: Pipe line, 25: Valve control part, 26: Detector, 27: Light receiving part, 28: Light emitting part, 29: Light beam, 30: Printing paper, 31: Toner image, 32: melting nipping part, 33: peeling claw, 34: peeling claw, 35: pressure vessel, 36: control part, 37: valve, 38: conduit, 39: pressure gauge, 40: control part, 41: Recorder, 42: pressure vessel, 43: peeling claw, 44: peeling claw.

Claims (5)

加熱ロールと、加圧ロールまたは加熱ロールからなり、相接することにより溶融挟持部を形成し、用紙のトナー画像を定着する定着ロール対と、前記溶融挟持部の出口側の加熱ロールの表面に付着した用紙に空気を噴出する剥離用管路と、剥離部材と、前記剥離用管路の開閉をする第１の弁と、前記剥離用管路に空気圧を供給する圧力供給部と、を有する定着装置において、
前記剥離用管路の空気噴出口近傍に接続される、第２の弁を有する排気用管路と、
前記溶融挟持部の入口側に設けられる用紙検知部と、
該用紙検知部の信号に基づき、前記溶融挟持部から用紙先端が搬出される時刻Ｔｓを算出し、前記第１の弁、第２の弁の開閉を制御する弁制御部とを有し、
該弁制御部は、前記第１の弁が時刻Ｔｓに開口されてから閉口するまでの時間をＴ０とし、
前記時刻Ｔｓから用紙剥離に要する時刻Ｔｔまでの時間をＴ１とし、
前記時刻Ｔｓから前記空気噴出口の空気噴出を終了する時刻Ｔｍまでの時間をＴ２とすると、
時刻Ｔｔから時間（Ｔ２−Ｔ１）の間、前記第２の弁を開口し、常圧となった後に閉口することを特徴とする定着装置。 A heating roll and a pressure roll or a heating roll are formed on the surface of the heating roll on the outlet side of the fusion sandwiching section, which forms a melt sandwiching section by contact with each other and fixes the toner image on the paper. having attached a peeling conduit for ejecting air to the paper, and a release member, a first valve for opening and closing of the release conduit, and a pressure supply unit for supplying air pressure to the release conduit In the fixing device,
An exhaust line having a second valve connected to the vicinity of the air outlet of the peeling line;
A sheet detection unit provided on the inlet side of the melting and clamping unit;
A valve control unit that calculates a time Ts at which the leading end of the sheet is carried out from the melting and clamping unit based on a signal from the sheet detection unit, and controls opening and closing of the first valve and the second valve;
The valve control unit sets T0 as a time from when the first valve is opened at time Ts to when the first valve is closed,
The time from the time Ts to the time Tt required for sheet separation is T1,
When the time from the time Ts to the time Tm at which the air ejection from the air ejection port ends is T2,
The fixing device is characterized in that the second valve is opened from time Tt to time (T2-T1), and is closed after normal pressure is reached . 前記剥離用管路を複数個設け、それらの出口を定着ロール軸方向において異なる位置に設けたことを特徴とする請求項１記載の定着装置。The fixing device according to claim 1, wherein a plurality of the separation pipes are provided, and outlets thereof are provided at different positions in the fixing roll axial direction. 前記空気圧を供給する管路と前記剥離用管路の接続部と、前記空気圧を供給する管路と前記排気用管路の接続部との圧力損失が、前者に比べ後者が小さい接続であることを特徴とする請求項１又は２に記載の定着装置。 The pressure loss between the pipe supplying the air pressure and the separation pipe, and the pressure loss between the pipe supplying the air pressure and the connection between the exhaust pipe is smaller in the latter than in the former. The fixing device according to claim 1 or 2 . 一対の加熱ロールからなり、相接することにより溶融狭持部を形成し、用紙のトナー画像を定着する定着ロール対と、A pair of fixing rolls, which are composed of a pair of heating rolls, form a melt sandwiching portion by contact, and fix the toner image on the paper;
空気を噴出する剥離用管路、剥離部材、前記剥離用管路を開閉する弁を、前記溶融狭持部の用紙搬送方向下流側で、且つ、前記定着ロール対の各ロールに対してそれぞれ設け、A separation pipe for ejecting air, a separation member, and a valve for opening and closing the separation pipe are provided on the downstream side in the sheet conveyance direction of the fusing pinching portion and for each roll of the fixing roll pair. ,
前記剥離用管路それぞれに空気圧を供給する圧力供給部を有し、A pressure supply section for supplying air pressure to each of the peeling pipes;
前記剥離用管路の空気噴出口の近傍に排気用管路をそれぞれ接続し、An exhaust pipe is connected in the vicinity of the air outlet of the peeling pipe,
該排気用管路はそれぞれ該排気用管路を開閉する弁を備え、Each of the exhaust lines includes a valve for opening and closing the exhaust line,
一方の加熱ロールに対するエアー剥離部の前記剥離用管路の空気噴出口は、他方の加熱ロールの前記剥離用管路の空気噴出口に対し、前記定着ロール対の軸方向において異なる位置となるように設けたことを特徴とする定着装置。The air jet outlet of the peeling pipe of the air peeling section with respect to one heating roll is located at a different position in the axial direction of the fixing roll pair with respect to the air jet outlet of the peeling pipe of the other heating roll. A fixing device provided in the above. 前記溶融狭持部の用紙搬送方向上流側に用紙検知部を設け、用紙検知部からの用紙検知信号に基づき、前記剥離用管路の各々の弁を、用紙先端が前記溶融狭持部を出てから剥離に要する時間だけ開口し、且つ、前記剥離用管路の各々の弁の閉口時に、前記排気用管路の弁をそれぞれ開口することを特徴とする請求項４記載の定着装置。A paper detection unit is provided upstream of the melt sandwiching part in the paper transport direction, and based on a paper detection signal from the paper detection part, each valve of the separation pipe passes through the melt sandwiching part. 5. The fixing device according to claim 4, wherein the fixing device is opened only for a time required for peeling, and each valve of the exhaust pipe is opened when each valve of the peeling pipe is closed.
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JP5942341B2 (en) 2010-08-20 2016-06-29 株式会社リコー Fixing apparatus and image forming apparatus
JP5609692B2 (en) * 2011-02-10 2014-10-22 コニカミノルタ株式会社 Image forming apparatus
JP5585486B2 (en) * 2011-02-17 2014-09-10 コニカミノルタ株式会社 Image forming apparatus
JP5849408B2 (en) 2011-03-01 2016-01-27 株式会社リコー Sheet separation device, fixing device, and image forming device
JP2012193015A (en) 2011-03-16 2012-10-11 Ricoh Co Ltd Sheet separating device, fixing device, and image forming apparatus
JP6132709B2 (en) * 2013-08-26 2017-05-24 キヤノン株式会社 Sheet peeling apparatus and image forming apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0367362U (en) * 1989-11-06 1991-07-01
JPH03166576A (en) * 1989-11-25 1991-07-18 Ricoh Co Ltd Image forming device
JPH0854801A (en) * 1994-08-10 1996-02-27 Toshiba Corp Fixing device
JP2000089603A (en) * 1998-09-09 2000-03-31 Fuji Xerox Co Ltd Peeling device and fixing device using the same
JP2005157179A (en) * 2003-11-28 2005-06-16 Fuji Xerox Co Ltd Fixing device and image forming device using it
JP2006113342A (en) * 2004-10-15 2006-04-27 Konica Minolta Business Technologies Inc Image forming apparatus

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