JP2005194089A - Image forming device - Google Patents

Image forming device Download PDF

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JP2005194089A
JP2005194089A JP2004004630A JP2004004630A JP2005194089A JP 2005194089 A JP2005194089 A JP 2005194089A JP 2004004630 A JP2004004630 A JP 2004004630A JP 2004004630 A JP2004004630 A JP 2004004630A JP 2005194089 A JP2005194089 A JP 2005194089A
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branching
image forming
recording paper
stepping motor
means
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JP4244191B2 (en )
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Chikashi Tanabe
史 田鍋
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Ricoh Co Ltd
株式会社リコー
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<P>PROBLEM TO BE SOLVED: To provide an image forming device attaining high printing productivity by improving branch claw changeover accuracy of a branching device to narrow the spacing of recording paper. <P>SOLUTION: The image forming device having recording paper conveying paths 15, 16 branched into a plurality of paths, comprises branching means 9, 12 for changing a recording paper conveying direction at the branch point of the recording paper conveying paths 15, 16; a position detecting means 21 for detecting the branching means 9, 12 to be in their base point positions; and a stepping motor 20 drive-connected to control the branching means 9, 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、分岐装置を有する複写機、ファクシミリ等の画像形成装置に関するものである。 The present invention is a copying machine having a branching device, an image forming apparatus such as a facsimile.

従来の両面搬送手段を有する画像形成装置は、いずれの画像面にも画像を形成していない記録紙を画像形成部に搬送させ片面を画像形成してから両面搬送手段に案内する搬送動作と、一面に画像が形成されて両面搬送手段を通して記録紙を反転させて他面を画像形成して排紙トレイ側に案内する搬送動作を交互に行うノンスタックインターリーフ方式を採用するものが多かった(例えば特許文献1および2参照)。 The image forming apparatus having a conventional two-sided conveying unit, a transport operation for guiding the one side to convey the recording sheet that does not form an image on any image plane to the image forming portion after the image formation to the duplex conveying unit, should be adopted non-stacked interleaf method in which a transport operation for guiding the image is formed on one surface by reverse discharge tray side to an image forming another surface the recording sheet through the duplex transport means to alternately were many ( for example, see Patent documents 1 and 2).
特許第2849485号 Patent No. 2849485 特開平10−181978号公報 JP 10-181978 discloses

上述したような画像形成装置における分岐装置は、記録紙と記録紙の間隔で一回ずつ分岐爪を切り換える必要があった。 Branching system in the image forming apparatus as described above, it is necessary to switch the branch claw once each at intervals of the recording sheet and the recording sheet. また、従来の分岐装置は分岐爪にソレノイドと戻しばねを組み合わせる構成であった。 Further, the conventional branching system was configured to combine return spring and solenoid branch claw.
しかしながら、ソレノイドは作動に伴う遅延時間が通常50から100m秒程度ある。 However, the solenoid is a delay time caused by the operation is about 100m seconds from the normal 50. また、切り換え途中の動作位置は制御できないので、分岐爪の高精度な制御は不可能であった。 Further, since the operating position of the middle switching can not be controlled, high-precision control of the branching claw was impossible.
さらに、ソレノイドがオフするとき、戻しばねの戻し力のみに頼っているので、切り換え途中の分岐爪の高精度な位置制御は不可能であった。 Further, when the solenoid is turned off, so relies only on the restoring force of the return spring, highly accurate position control switching during the branching claw was impossible.
そのため、従来機の分岐装置においては分岐爪の切り換え精度が悪いため記録紙と記録紙の紙間隔を広く取り分岐部のジャムを回避していた。 Therefore, in the branch device of the conventional machine has been avoided widely taken bifurcation jam paper spacing of the recording sheet and the recording sheet is poor switching precision of the branching claw. したがって、紙間隔が広がることで印刷の生産性が低くなるという問題点があった。 Therefore, the productivity of the printing by the paper gap widens is disadvantageously lowered.
そこで本発明の目的は、上述した実情を考慮してなされたもので、分岐装置の分岐爪切り換え精度を向上することによって、記録紙間隔を狭めて高い印刷生産性を達成する画像形成装置を提供することにある。 Accordingly, an object of the present invention has been made in view of the circumstances described above, by improving the branching claw switching accuracy branch device, an image forming apparatus to achieve high print productivity by narrowing the recording paper interval It is to.

上記の課題を解決するために、請求項1に記載の発明は、複数の経路に分岐する記録紙搬送経路を有する画像形成装置において、前記記録紙搬送経路の分岐点で記録紙搬送方向を切り換える分岐手段と、この分岐手段が基点となる位置にあることを検知する位置検知手段と、前記分岐手段を制御するために駆動連結されたステッピングモータとを備えた画像形成装置を特徴とする。 In order to solve the above problems, the invention according to claim 1, in an image forming apparatus having a recording paper transport path that branches into a plurality of paths, switches the recording paper conveying direction at the branch point of the recording paper transportation path a branching means and a position detecting means for detecting that the branch unit is in the base position, the image forming apparatus having a stepping motor which is drivingly connected for controlling said branching means.
また、請求項2に記載の発明は、記録紙の先端が前記分岐手段の記録紙ガイド部に衝突するタイミングでは前記ステッピングモータの励磁電流値を上げておき、前記記録紙の先端が前記分岐手段の前記記録紙ガイド部を過ぎた時点で前記ステッピングモータの励磁電流値を下げる請求項1記載の画像形成装置を特徴とする。 The invention according to claim 2, at the timing when the leading edge of the recording sheet impinges on the recording paper guide portion of said branch means in advance by increasing the excitation current value of the stepping motor, the tip of the recording paper is the branching means wherein the image forming apparatus of the recording paper guide unit at the time of past lowering the excitation current value of the stepping motor according to claim 1, wherein.
また、請求項3に記載の発明は、通紙する記録紙が厚紙であることがプリント信号により判別された場合は、前記分岐手段と記録紙が接触している間は前記ステッピングモータの励磁電流を上げ続ける請求項2記載の画像形成装置を特徴とする。 The invention according to claim 3, when it recording paper to fed is thick paper is determined by the print signal, while the branching means and the recording sheet is in contact exciting current of said stepping motor wherein the image forming apparatus according to claim 2, wherein the continuously raised.

本発明によれば、ステッピングモータはステップ角度毎の位置制御および回転スピード制御が可能なので、分岐爪の切り換え精度が向上し、延いては、記録紙間隔を狭めた高い印刷生産性を達成できる。 According to the present invention, since the stepping motor is capable of position control and rotational speed control for each step angle, the switching precision of the branching pawl is improved, and by extension, can achieve high printing productivity narrowed recording paper spacing.

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。 Hereinafter, with reference to the drawings, an embodiment of the present invention in detail. 図1は本発明による両面搬送装置付きの画像形成装置の全体概略図である。 Figure 1 is an overall schematic view of an image forming apparatus with a duplex conveying apparatus according to the present invention. 図示の画像形成装置は、装置本体1内の給紙カセット2に積載された記録紙3を給紙コロ4により搬送する。 The image forming apparatus illustrated conveys the recording paper 3 stacked on the sheet feeding cassette 2 in the apparatus main body 1 by the feed roller 4.
搬送された記録紙3はレジストローラ対5で画像と記録紙の位置合わせを行い、感光体6と転写ベルト7により記録紙3の片面に画像を形成し、その後、定着ローラ対8によって記録紙3の表面のトナー画像をこの記録紙3に溶融定着する。 Recording paper 3 conveyed performs image registration between the recording paper by the resist roller pair 5, an image is formed on one side of the recording sheet 3 by the transfer belt 7 and the photosensitive member 6, thereafter, the recording paper by the fixing roller pair 8 the toner image 3 on the surface to melt fixing on the recording sheet 3.
その後、記録紙3の両面に印刷しない場合は分岐爪9により排紙ローラ対10に記録紙3を搬送させて排紙トレイ11に排出するが、記録紙3の両面に印刷する場合は分岐爪9、第2分岐爪12により記録紙搬送経路を切り換えて、搬送ローラ13、正逆転ローラ14を経て記録紙3をスイッチバック搬送路15に案内する。 Thereafter, if no print on both sides of the recording sheet 3 is discharged to the paper discharge tray 11 by conveying the recording sheet 3 to the sheet discharging roller pair 10 by the branching claw 9, when printing on both sides of the recording sheet 3 is branched claw 9, by switching the recording sheet conveying path by the second branching pawl 12, the transport roller 13, via the forward reverse roller 14 for guiding the recording sheet 3 to the switchback path 15.
スイッチバック搬送路15に入った記録紙の後端が第2分岐爪12の先端部を越えたら、正逆転ローラ14を逆転させると共に第2分岐爪12を作動させて記録紙を再搬送路16に案内し、レジストローラ対5を経て記録紙3の逆面に印刷を行う。 When the trailing edge of the recording sheet enters the switchback path 15 exceeds the tip of the second branch claw 12, the second branch pawl 12 re-conveying path 16 to the recording paper by operating together with reversing the forward and backward rotating roller 14 guide, the printing on the reverse surface of the recording paper 3 passes through registration roller pair 5.
上記のような搬送経路を使用することによって両面印刷が可能であるが、1枚毎に上記搬送プロセスを行うと両面印刷の生産性が極端に悪化する。 While it is possible duplex printing by using the conveyance path as described above, when the conveying process duplex printing productivity is extremely deteriorated one by one. そのため、再搬送路16からの裏面印刷動作と、給紙カセット2からの表面印刷動作を交互に行う、いわゆるノンスタックインターリーフ方式を採用することで両面印刷の生産性を向上させている。 Therefore, the back side printing operation from the re-conveying path 16, alternately performs surface printing operation from the sheet feed cassette 2, thereby improving the two-sided printing productivity by adopting a so-called non-stacked interleaf method.
このインターリーフ方式を採用すると、分岐爪9は1枚毎に搬送路を切り換えることとなるが、さらに高い生産性を確保するためには、記録紙同士の紙間隔が短縮されても、その短い紙間隔の間で精度良く用紙を分岐できる装置が必要となる。 By adopting this interleaf method, branching claw 9 is a switching the conveying path one by one, in order to ensure a higher productivity, even if the paper intervals of the recording sheet to each other is shortened, the short device capable of branching accurately paper between the paper gap is required.

図2は本発明の画像形成装置に使用する分岐装置を示す斜視図である。 Figure 2 is a perspective view showing a branching unit for use in an image forming apparatus of the present invention. 図2の斜視図においては説明をし易くするために、上ガイド板22、排紙ローラ10と搬送ローラ13の上側のローラは省略している。 For ease of explanation in the perspective view of FIG. 2, the upper roller of the upper guide plate 22, discharge roller 10 and the conveying roller 13 are omitted.
分岐爪9は軸9−2上に複数の爪部材9−1が配置された構成になっている。 Branch claw 9 has a configuration in which a plurality of pawl members 9-1 onto the shaft 9-2 are arranged. 爪部材9−1の先端は左下ガイド板18と右下ガイド板19にあいた穴(凹形状でも可)18−1、19−1に嵌合可能であり、それによって記録紙の搬送方向を分岐する。 The tip of the claw member 9-1 is engageable in the lower left guide plate 18 and the lower right guide plate 19 Ai hole (or a concave shape) 18-1, 19-1, branching the conveying direction of the recording paper thereby to.
軸9−2には回転位置を検知するシャッタ部9−3が固定され、そのシャッタ部9−3のエッジをフォトセンサ21で検知することにより分岐爪9が記録紙を排紙トレイ11側に案内する第1姿勢を検知できる。 The shaft 9-2 shutter unit 9-3 for detecting the rotational position is fixed, the branching claw 9 is a recording sheet by detecting the edge of the shutter portion 9-3 by the photo sensor 21 to the discharge tray 11 side It can detect the first posture to guide.
軸9−2にはプーリ9−4が固定されていて、タイミングベルト23を介してステッピングモータ20に駆動連結されている。 The shaft 9-2 are not pulley 9-4 is fixed, is drivingly connected to the stepping motor 20 via a timing belt 23. 分岐爪9はこのステッピングモータ21の駆動力で動作している。 Branch claw 9 is operating in the driving force of the stepping motor 21.

図3は分岐爪を初期設定する動作を説明するフローチャートである。 Figure 3 is a flowchart for explaining the operation of initializing the branching claw. 印刷指令が入力されると、フォトセンサ21の検知状態を確認し(S1)、オンならばオフになるまでステッピングモータ20を逆転する(S2)。 When a print command is input, to check the detection status of the photo sensor 21 (S1), to reverse the stepping motor 20 to turn off if ON (S2).
但し、所定時間内にオフ検知しない場合(S5)は、部品の故障の可能性があるので装置を停止し、故障表示とする(S6)。 However, if not off detected within a predetermined time (S5), there is a possibility of component failure stop device, and fault display (S6). 無事にオフ検知となったらオン検知になるまでステッピングモータ20を正転させる(S7)。 To successfully rotate forward the stepping motor 20 until on detection If the OFF detecting (S7).
先ほどと同様に所定時間内にオン検知しない場合は部品の故障の可能性があるので装置を停止し、故障表示とする(S11)。 Because if not turned detected within as before the predetermined time the possibility of component failure the device is stopped, and the fault display (S11). 無事にオン検知となったらステッピングモータ20を無回転状態にて励磁させ(S12)、待機状態とする。 Safely the stepping motor 20 When turned on detection is powered in a non-rotational state (S12), a standby state. もし、プリントジョブが片面印刷の場合、このまま印刷動作を始める。 If the print job is single-sided printing, it starts the printing operation in this state.
プリントジョブが両面印刷ならば(S13)、ステッピングモータ20を所定パルス数逆転させ(S14)、記録紙を両面搬送手段側に案内する第2姿勢まで駆動した後、停止し励磁させ(S15)、待機状態とする。 If the print job is duplex printing (S13), the stepping motor 20 is rotated reversely a predetermined number of pulses (S14), after the recording sheet has been driven to a second position for guiding the double-sided conveying means side, it stops excited (S15), in a standby state.
この制御で印刷前の分岐爪9の位置がどこにあっても、精度良くシャッタ部9−3のエッジを検知することにより、基点である第1姿勢もしくは第1姿勢より所定のパルス分移動した第2姿勢を保持した状態で印刷待機できる。 Even the position of the branch claw 9 before printing in this control where, by detecting the edge of accurately shutter unit 9-3, the moved predetermined pulses than the first position or the first position is a base point It can print wait in a state of holding the second position.

図4は分岐装置の詳細断面図である。 Figure 4 is a detailed cross-sectional view of the branching unit. 図4では分岐爪9が記録紙を排紙トレイ11側にガイドする第1姿勢を示している。 Figure 4 The branching claw 9 indicates a first position for guiding the recording paper to the discharge tray 11 side. 図5は図4の分岐装置の詳細断面図である。 Figure 5 is a detailed sectional view of a branching unit in FIG. 図5では記録紙を両面搬送手段側に案内する第2姿勢を示している。 Figure 5 the recording sheet shows a second posture for guiding the double-sided conveying means side.
図4および図5において、分岐爪9の第1姿勢と第2姿勢とのなす角をθ°、分岐爪9とガイド板22のオーバーラップ量をL(mm)、用紙の線速をV(mm/秒)、記録紙と記録紙の紙間隔をlp(mm)としている。 4 and 5, the angle of theta ° between the first posture and the second posture of the branch claw 9, the overlap amount of the branching claw 9 and the guide plate 22 L (mm), the linear velocity of the sheet V ( mm / sec), and the paper interval of the recording sheet and the recording sheet as a lp (mm).
図4において先行の記録紙の後端が分岐爪9の先端位置に位置したときに、図示していないステッピングモータ20を駆動開始する。 Trailing edge of the preceding recording sheet 4 is when located at the end position of the branch claw 9, starts driving the stepping motor 20 (not shown). 分岐爪9の回転スピードをおよそV・θ/L(°/秒)となるようにステッピングモータ20を駆動制御すれば、分岐爪9と先行の記録紙の後端が接触せずに切り換えが可能である。 If the drive control of the stepping motor 20 to the rotation speed of the branching claw 9 becomes approximately V · θ / L (° / sec), it can be switched without contacting the trailing edge of the recording paper prior to the branch claw 9 it is.

図5は分岐爪9が第2姿勢になった瞬間の図である。 Figure 5 is a view at the moment the branch claw 9 becomes the second attitude. 図からも分かるように、スリップなどを考えずに理想値だけを考慮すると、記録紙と記録紙の紙間隔lp(mm)が分岐爪9とガイド板22のオーバーラップ量L(mm)よりも大きければ記録紙の分岐は可能である。 As can be seen from the figure, when considering only the ideal value without considering such slippage, paper interval lp of the recording sheet and the recording sheet (mm) than the overlap amount L of the branch claw 9 and the guide plate 22 (mm) a branch of the recording paper is larger is possible.
なお、第2姿勢を検知する検知手段は不要であり、第1姿勢から所定のパルス数をステッピングモータ20に入力することによって第2姿勢の位置決めを行う。 Incidentally, the detection means for detecting the second position is not necessary, to position the second posture by entering from the first posture predetermined number of pulses to the stepping motor 20. 装置全体の制御手段は画像形成装置本体に組み込まれている。 Control means for the whole device is incorporated in the image forming apparatus main body.
所定のパルス数とは分岐爪9の第1姿勢と第2姿勢とのなす角θ°をステッピングモータ20の分解能角度および駆動部分の減速比で簡単に求めることができる。 The predetermined number of pulses can easily obtain the angle theta ° between the first posture and the second posture of the branching pawl 9 at the speed reduction ratio of the resolution angle and drive portion of the stepping motor 20. 分岐点でもステッピングモータを使うことは可能である。 It is possible to use a stepping motor in the branch point.
上記のような制御にてステッピングモータ20を制御すると、このステッピングモータ20は無回転状態でも励磁する必要があり、100%の電流値が付与されてしまい、長い時間プリントが続くとステッピングモータ20の温度がどんどん上昇してしまう。 By controlling the stepping motor 20 in the above-described control, the stepping motor 20 must be energized in nonrotating state, causes the current value of 100% is applied, the stepping motor 20 when the long time printing continues temperature resulting in a steadily rising.
そこで、記録紙から分岐爪9への負荷力がピークになるときだけ100%電流値を付与し、その他のタイミングでは電流値を下げてステッピングモータ20の温度上昇を抑える必要がある。 Therefore, the load force from the recording paper to the branch claw 9 is granted only 100% current value when a peak, it is necessary to suppress the temperature rise of the stepping motor 20 to lower the current value in the other timing.
記録紙から分岐爪9への負荷力がピークになるときは記録紙の先端が分岐爪9の記録紙案内面に衝突するときであり、衝突が予想される時間帯のみステッピングモータ20への励磁電流を100%とする。 Excitation of the recording paper when the load force to the branch claw 9 becomes peak is when the leading edge of the recording sheet impinges on the recording paper guide surface of the branch claw 9, the stepping motor 20 only time zone collision is expected current to 100%.
そのとき以外のタイミング、つまり分岐爪9の姿勢移動中や、記録紙の先端が分岐爪9を通り越した以降の時間は電流値を20〜50%下げる制御にしてステッピングモータ20の温度上昇を抑制する。 Timing other than that time, that is suppressed and in attitude change of the branch claw 9, the temperature rise of the stepping motor 20 leading edge of the recording sheet in the control time to lower the current value 20% to 50% after having past the branching claw 9 to.

しかしながら、上記のような電流値制御は普通紙、いわゆる坪量157g/m 未満の記録紙に最適な制御手段である。 However, the current value control as described above plain paper, an optimal control means to the so-called basis weight 157 g / m 2 less than the recording paper. これ以上の重さの記録紙いわゆる厚紙は記録紙の先端が分岐爪9に衝突するときはもちろんのこと、記録紙が通過している最中に分岐爪9へ負荷を与える。 No more of the weight of the recording paper so thick that the course when the leading end of the recording paper collides with the branch claw 9, giving a load to the branching claw 9 while the recording sheet is passing through.
したがって、プリントジョブが厚紙指定のとき、分岐爪9と記録紙が接触している間は励磁電流を100%とし、記録紙と接触していないときもしくは分岐爪9が回転駆動するときのみ電流値を20〜50%下げる制御とする。 Therefore, when the print job is specified cardboard, while contact with the branch claw 9 recording paper to the excitation current is 100%, see current value when or branch claw 9 is driven to rotate when not in contact with the recording paper the and control to lower 20% to 50%. これにより、厚紙通紙途中での分岐爪9の姿勢がずれることなく良好な搬送性能を確保できる。 Thus, it is possible to ensure a good conveying performance without orientation of the branch claw 9 in the middle thick paper passage is deviated.
ステッピングモータ20はステップ角度毎の位置制御および回転スピード制御が可能なので、分岐爪9の切り換え精度が向上し、延いては、記録紙間隔を狭めた高い印刷生産性を達成できる。 Since the stepping motor 20 is capable of position control and rotational speed control for each step angle, improves switching accuracy of branch claw 9, by extension, it can achieve high printing productivity narrowed recording paper spacing.
ホームポジションセンサは分岐爪9が記録紙を排紙トレイ11側に案内する第1姿勢を検知できるので、ステッピングモータ20の往復動作の基点が狂うことが無く、分岐爪9の切り換え精度が向上し、延いては、記録紙間隔を狭めた高い印刷生産性を達成できる。 Since the home position sensor can detect the first position of the branch claw 9 is to guide the recording paper to the discharge tray 11 side, without that base point of the reciprocating operation of the stepping motor 20 is out of order, improves switching accuracy of the branching claw 9 , by extension, it can achieve high printing productivity narrowed recording paper spacing.
制御手段はプリントジョブの内容を判断して両面ジョブと判断したら、分岐爪9を事前に両面搬送手段側に案内する第2姿勢に切り換えた位置で分岐爪9を待機することができるので、両面プリント1枚目の動作が速く行える。 The control means if it is determined that the duplex print job to determine the contents of the print job, it is possible to wait the branching pawl 9 at a position switched to the second posture for guiding the two-sided conveyance unit side in advance a branch claw 9, both sides print the first sheet of the operation can be performed faster.

本発明によれば、画像形成装置は画像形成された記録紙を排出する排紙トレイ11と、一面側に画像が形成された用紙を他面側に画像を形成させるために反転させて再度画像形成手段に搬送する両面搬送手段とを有し、記録紙を排紙トレイ11側もしくは該両面搬送手段側へと搬送方向を切り換える分岐手段を有する。 According to the present invention, the image forming apparatus sheet discharge tray 11 for discharging the recording paper on which images are formed, again by inverting in order to form an image sheet on which the image is formed on one side on the other side image and a duplex conveying means for conveying the forming means comprises a branching means for switching the conveying direction the recording sheet to the sheet discharge tray 11 side or double-sided conveying means side.
また、画像形成装置は、分岐手段が同軸上に設けた複数の分岐爪9と、これらの分岐爪近傍のガイド板18上にあいた分岐爪9がはまる穴と、分岐爪9に駆動連結されたステッピングモータ20と、分岐爪9が記録紙を排紙トレイ11側に案内する第1姿勢にあることを検知できるホームポジションセンサとを有する。 Further, the image forming apparatus, branching means and a plurality of branch claw 9 provided coaxially, and these branch claw hole branching claw 9 vacated on the guide plate 18 in the vicinity of fit, which is drivingly connected to the branch claw 9 a stepping motor 20, and a home position sensor which can detect that in a first position in which the branch claw 9 is to guide the recording paper to the discharge tray 11 side.
プリントジョブの信号を検知したら片面ジョブか両面ジョブかを判断し、両面ジョブと判別されたら、ステッピングモータ20を所定のパルス数にわたって駆動して分岐爪9が第1姿勢から記録紙を両面搬送手段側に案内する第2姿勢に切り換えた位置でステッピングモータ20を励磁して記録紙の到着を待機する制御手段を有している。 Determine side print job or duplex print job when detecting a signal of a print job, if it is determined that duplex print job, the branching claw 9 by driving the stepping motor 20 for a predetermined number of pulses duplex conveying means the recording sheet from the first posture and a control means for waiting for the arrival of the recording sheet by exciting the stepping motor 20 at a position switched to the second posture for guiding the side.
制御手段は記録紙の先端が分岐爪9の記録紙ガイド部に衝突するタイミングはステッピングモータ20の励磁電流値を上げておくことができるので、記録紙衝突の負荷で分岐爪9のガイド位置がずれることによる記録紙ジャムを回避できる。 The control means timing the leading edge of the recording paper collides with the recording sheet guide portion of the separation pawl 9 can be kept up an exciting current value of the stepping motor 20, the guide position of the branch claw 9 in the load of the recording paper collides It can be avoided recording paper jam caused by the displaced.
制御手段は記録紙の先端が分岐爪9の記録紙ガイド部を過ぎたらステッピングモータ20の励磁電流値を下げることができるので、ステッピングモータ20自体の発熱を低く抑えることができる。 Control means it is possible to reduce the excitation current value of the stepping motor 20 When the leading edge of the recording paper past the paper guide section of the branching claw 9, it is possible to suppress the heat generation of the stepping motor 20 itself.
制御手段は通紙する記録紙が厚紙であることがプリント信号により判別された場合は、分岐爪9と記録紙が接触している間はステッピングモータ20の励磁電流を上げ続けることができるので、厚紙通紙による負荷に分岐爪9の位置保持力が確保でき、厚紙通紙時のジャムを回避できる。 If the control means for the recording paper to be fed is determined by the print signal that is thick paper, because while the recording sheet and the branching pawl 9 is in contact can continue to increase the exciting current of the stepping motor 20, position holding force of the branch claw 9 to the load by the thick paper passage can be secured, it is possible to avoid the jam during thick paper feeding.
制御手段は通紙する紙種に見合ったステッピングモータ20の電流値を変化することができるので、省エネルギを達成できる。 The control means may vary the current value of the stepping motor 20 commensurate with the paper type of passed, saving energy can be achieved. ステッピングモータで制御する分岐手段は分岐爪以外でもよい。 Branching means for controlling a stepping motor may be other than the branching claw.

本発明による両面搬送装置付きの画像形成装置の全体概略図である。 It is an overall schematic view of an image forming apparatus with a duplex conveying apparatus according to the present invention. 本発明の画像形成装置に使用する分岐装置を示す斜視図である。 It is a perspective view showing a branching unit for use in an image forming apparatus of the present invention. 分岐爪を初期設定する動作を説明するフローチャートである。 The branching claw is a flow chart for explaining an operation to initialize. 分岐装置の詳細断面図である。 It is a detailed cross-sectional view of the branching unit. 図4の分岐装置の詳細断面図である。 It is a detailed sectional view of a branching unit in FIG.

符号の説明 DESCRIPTION OF SYMBOLS

3 記録紙 9 分岐手段(分岐爪) 3 recording sheet 9 branching means (branching pawl)
12 分岐手段(分岐爪) 12 branch means (branch claw)
15 記録紙搬送経路(スイッチバツク搬送経路) 15 a recording paper transportation path (Suitchibatsuku conveyance path)
16 記録紙搬送経路(再搬送経路) 16 a recording paper conveying path (re-conveying path)
20 ステッピングモータ(制御手段) 20 Stepping motor (control means)
21 位置検知手段(フォトセンサ) 21 position detecting unit (photosensor)

Claims (3)

  1. 複数の経路に分岐する記録紙搬送経路を有する画像形成装置において、前記記録紙搬送経路の分岐点で記録紙搬送方向を切り換える分岐手段と、この分岐手段が基点となる位置にあることを検知する位置検知手段と、前記分岐手段を制御するために駆動連結されたステッピングモータと、を備えたことを特徴とする画像形成装置。 In the image forming apparatus having recording sheet conveyance path that branches into a plurality of paths, detects that there are a branch means for switching the recording paper conveying direction at the branch point of the recording sheet conveying path, to a position where the branching unit is a base point a position detecting means, the image forming apparatus characterized by comprising a stepping motor which is drivingly connected for controlling said branching means.
  2. 記録紙の先端が前記分岐手段の記録紙ガイド部に衝突するタイミングでは前記ステッピングモータの励磁電流値を上げておき、前記記録紙の先端が前記分岐手段の前記記録紙ガイド部を過ぎた時点で前記ステッピングモータの励磁電流値を下げることを特徴とする請求項1記載の画像形成装置。 At the timing when the leading edge of the recording sheet impinges on the recording paper guide portion of said branch means in advance by increasing the excitation current value of the stepping motor, when the leading end of the recording sheet has passed the paper guide section of said branching means the image forming apparatus according to claim 1, wherein lowering the excitation current value of the stepping motor.
  3. 通紙する記録紙が厚紙であることがプリント信号により判別された場合は、前記分岐手段と記録紙が接触している間は前記ステッピングモータの励磁電流を上げ続けることを特徴とする請求項2記載の画像形成装置。 If the recording paper to be fed is determined by the print signal that is cardboard, claim 2 while the branching means and the recording sheet is in contact, characterized in that to continue increasing the exciting current of said stepping motor the image forming apparatus according.
JP2004004630A 2004-01-09 2004-01-09 Image forming apparatus Expired - Fee Related JP4244191B2 (en)

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JP2007031129A (en) * 2005-07-29 2007-02-08 Ricoh Co Ltd Image forming device
JP2007169058A (en) * 2005-11-24 2007-07-05 Ricoh Co Ltd Carrying device, image forming device using this carrying device and its carrying control method
JP2007276934A (en) * 2006-04-04 2007-10-25 Ricoh Co Ltd Guiding method for sheet-shaped medium, guiding device for sheet-shaped medium, route switching device for sheet-shaped medium and image forming device
JP2009263053A (en) * 2008-04-23 2009-11-12 Kyocera Mita Corp Conveying out direction switching device for sheet, and image forming device
JP2010030743A (en) * 2008-07-29 2010-02-12 Kyocera Mita Corp Sheet carry-out direction changing device, and image forming device
JP2010286537A (en) * 2009-06-09 2010-12-24 Kyocera Mita Corp Image forming apparatus
US7918451B2 (en) 2007-05-17 2011-04-05 Ricoh Company, Limited Switchback mechanism and image forming apparatus
US7954814B2 (en) 2007-03-13 2011-06-07 Ricoh Company, Ltd. Feeding device and image forming apparatus
JP2012212169A (en) * 2012-07-04 2012-11-01 Kyocera Document Solutions Inc Image forming apparatus
US8960673B2 (en) 2012-11-30 2015-02-24 Kyocera Document Solutions Inc. Image forming apparatus
JP2015202947A (en) * 2014-04-15 2015-11-16 京セラドキュメントソリューションズ株式会社 Sheet conveyance apparatus, manuscript conveyance apparatus comprising the same, and image forming apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007031129A (en) * 2005-07-29 2007-02-08 Ricoh Co Ltd Image forming device
JP2007169058A (en) * 2005-11-24 2007-07-05 Ricoh Co Ltd Carrying device, image forming device using this carrying device and its carrying control method
JP4596477B2 (en) * 2005-11-24 2010-12-08 株式会社リコー Conveying apparatus and an image forming apparatus using the same and conveying control method thereof
JP2007276934A (en) * 2006-04-04 2007-10-25 Ricoh Co Ltd Guiding method for sheet-shaped medium, guiding device for sheet-shaped medium, route switching device for sheet-shaped medium and image forming device
US8256769B2 (en) 2007-03-13 2012-09-04 Ricoh Company, Ltd. Feeding device and image forming apparatus
US7954814B2 (en) 2007-03-13 2011-06-07 Ricoh Company, Ltd. Feeding device and image forming apparatus
US8070159B2 (en) 2007-05-17 2011-12-06 Ricoh Company, Limited Switchback mechanism and image forming apparatus
US7918451B2 (en) 2007-05-17 2011-04-05 Ricoh Company, Limited Switchback mechanism and image forming apparatus
JP2009263053A (en) * 2008-04-23 2009-11-12 Kyocera Mita Corp Conveying out direction switching device for sheet, and image forming device
JP2010030743A (en) * 2008-07-29 2010-02-12 Kyocera Mita Corp Sheet carry-out direction changing device, and image forming device
JP2010286537A (en) * 2009-06-09 2010-12-24 Kyocera Mita Corp Image forming apparatus
JP2012212169A (en) * 2012-07-04 2012-11-01 Kyocera Document Solutions Inc Image forming apparatus
US8960673B2 (en) 2012-11-30 2015-02-24 Kyocera Document Solutions Inc. Image forming apparatus
JP2015202947A (en) * 2014-04-15 2015-11-16 京セラドキュメントソリューションズ株式会社 Sheet conveyance apparatus, manuscript conveyance apparatus comprising the same, and image forming apparatus

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