JP3789640B2 - Photosensitive material processing equipment - Google Patents

Description

この表１より、一対のフラットローラからなる搬送ローラによる搬送力が、一方のローラをいぼローラとした搬送ローラによる搬送力より、大きいことが分かり、搬送ローラを一対のフラットローラとすることで、印画紙Ｃの蛇行、搬送量のばらつきのより一層の改善が図れ、搬送性能が向上することになる。
【００６４】
尚、２列搬送或いは３列搬送といった複数列搬送の場合、搬送力が単列搬送時の１／２、１／３となり、搬送力の絶対値が低下する。
【００６５】
一方、オレフィン系エラストマローラ及びＳＥＢＳ系エラストマローラと印画紙Ｃの乳剤面との間の摩擦係数（「Ｅｍ面タッチ」で表す）及び、オレフィン系エラストマローラ及びＳＥＢＳ系エラストマローラと印画紙Ｃの背面との間の摩擦係数（「バック面タッチ」で表す）をそれぞれ比較した実験を行い、この実験の結果のデータを表したグラフが、表２である。
【００６６】
【表２】

このグラフからこれらのソフトローラと印画紙Ｃの乳剤面との接触による摩擦係数が、これらのソフトローラと印画紙Ｃの背面との接触による摩擦係数より、大きいという実験結果が読み取れる。つまり、この実験結果より、印画紙Ｃの乳剤面側に対向してソフトローラを設置することで搬送力が高まり、印画紙Ｃの蛇行、搬送量のばらつきの更なる改善が可能となる。
【００６７】
更に、搬送抵抗が大きいために、より大きな搬送力が必要で大きなニップ力（例えば約１６６０ｇｆ）を必要とする入口側搬送ローラ４６では、動摩擦係数差に起因したローラの材質間での搬送力差が顕著に生じ、オレフィン系エラストマローラでは搬送力不足が生じてくる。
【００６８】
この為、ソフトローラの材質としてＳＥＢＳ系エラストマを採用することで、摩擦係数が大きくなって搬送力が高まり、搬送性能のさらなる大幅な性能向上が期待される。
【００６９】
以上の結果から、搬送時間の測定データを表す表３に示すような搬送精度の差となって現れてくる。尚、ここでサーモランはオレフィン系のエラストマの一種であり、ラバロンはＳＥＢＳ系エラストマの一種である。
【００７０】
【表３】

表３に示すように、３列搬送時には、ＳＥＢＳ系エラストマローラと比較して、オレフィン系エラストマローラは各搬送列間の搬送時間差も大きく、各搬送列内における時間ばらつきも多い。尚、表３において、各列の×と×との間の距離が大きい程、時間ばらつきが大きいことを表す。
【００７１】
次に、出口側搬送ローラ４８の機能及び構造について以下に具体的に説明する。
【００７２】
印画紙Ｃの自然なカール方向と逆方向に小さな曲率半径で印画紙Ｃをターンさせる場合、印画紙Ｃのカールにより印画紙Ｃの先端の出口側搬送ローラ４８ヘの突入角度が大きくなり、出口側搬送ローラ４８のニップ位置への入り込みが非常に悪く、搬送遅れが生じる傾向にある。
【００７３】
この搬送遅れは入口側搬送ローラ４６のニップ力を大きくして搬送力を上げても改善されず、出口側搬送ローラ４８ヘの印画紙Ｃの先端の入り込みを良化させない限り、改善されないものである。
【００７４】
そこで、本実施の形態では、出口側搬送ローラ４８を、ターン部５４の内周側に配置されるフラット形状ローラ４８Ａとターン部５４の外周側に配置される串形状ローラ４８Ｂとの組み合わせで形成し、さらに、ターンガイド５２の上部にガイドリブ５２Ａを複数設け、串形状ローラ４８Ｂの各串駒５０間にガイドリブ５２Ａを入れ込んで、各串駒５０とガイドリブ５２Ａとをオーバラップさせることとした。
【００７５】
この結果、串形状ローラ４８Ｂの各串駒５０間に入れ込まれたガイドリブ５２Ａに案内されて、印画紙Ｃの先端の出口側搬送ローラ４８への入り込みが向上されて、搬送遅れが防止され、ターン部５４で印画紙Ｃが一瞬停止するおそれが解消された。
【００７６】
また、串形状ローラ４８Ｂと対向するフラット形状ローラ４８Ａの外層材料としてＳＥＢＳ系エラストマを採用することで、前述の入口側搬送ローラ４６と同様に、搬送性能の性能向上が認められた。
【００７７】
次に、ローラたわみ防止のための構造について、以下に具体的に説明する。
【００７８】
図８に示すように、ニップ力によりローラにたわみが生じて一対のローラの幅方向中央に最大隙間ｔができる。そして、付与されるニップ荷重に対してローラの曲げ剛性が不足すると、隙間は大きくなり、例えば３列で印画紙Ｃが搬送される場合には、中央列での搬送遅れ及び搬送量のばらつきが顕著になる。この結果として、同列内を搬送される印画紙Ｃ同士の重なりや処理品質の列間差等の問題が生じる。
【００７９】
これに対して、ローラの曲げ剛性を調整して、ローラのたわみにより生じる一対のローラ間の隙間を、表４に示すように例えば０．１７４mm、０．０６６mm、０．０４６mmというように変化させた実験データのグラフより、一対のローラ間の隙間を小さくすることで、搬送遅れ及び搬送量のばらつきを抑えることが可能となることが判明した。
【００８０】
【表４】

さらに、中央列の搬送遅れ及び搬送量のばらつきと一対のローラの間の隙間との関係を確認する実験を行ったところ、中央列の搬送遅れと最大隙間ｔの大きさとの関係を表す表５及び、中央列の搬送量のばらつきと最大隙間ｔの大きさとの関係を表す表６のような結果が得られた。
【００８１】
【表５】

【００８２】
【表６】

この結果から、最大隙間ｔが小さくなると、中央列の搬送遅れ及び中央列の搬送量のばらつきが小さくなることが判るが、搬送量のばらつきとして許容される０．０５mmに対応する最大隙間ｔ＝０．０５mm程度が一対のローラの最大許容隙間とされる。そして、搬送ローラを形成する一対のローラの最大許容隙間である０．０５mmは、通常、処理される印画紙Ｃの厚みの約１／３である。
【００８３】
従って、この条件を満足するために、ターン部５４の入口側搬送ローラ４６のソフトフラットローラは、図７に示すように、金属パイプ６２の周りを樹脂パイプ６４が覆い、この樹脂パイプ６４の外周をエラストマ層６６が被覆し、このソフトフラットローラの両端に超音波溶着又は接着等で固着された軸端部６８がソフトフラットローラの両端それぞれ塞ぐような構造となっている。つまり、中空の樹脂パイプ６４内に金属パイプ６２を入れて曲げ剛性アップを図るような構造が採用されている。
【００８４】
さらに、これらソフトフラットローラを形成する樹脂パイプ６４の材質としてはＰＰＥ（三菱エンジニアリングプラスチックス製の商品名ユピエース）を採用し、金属パイプ６２の材質としてはステンレス鋼の一種であるＳＵＳ３１６を採用し、エラストマ層６６の材質としては熱可塑性エラストマであるＳＥＢＳ（水添ＳＢＳ）系エラストマ（三菱化学製の商品名ラバロン）を採用した。
【００８５】
また、このソフトフラットローラの製造方法としては、押出または射出成形された樹脂パイプ６４の内周に金属パイプ６２を圧入し、更にそれらの外周にＳＥＢＳ系エラストマを射出成形し、或いは押出または射出成形されたＳＥＢＳ系エラストマチューブを被覆することが考えられる。また、金属パイプ６２の外周に熱可塑性樹脂を射出成形し、更にその外周にＳＥＢＳ系エラストマを射出成形し、或いは押出または射出成形されたＳＥＢＳ系エラストマチューブを被覆することが考えられる。
【００８６】
次に、２組の搬送ローラのニップ力の設定を以下に具体的に説明する。
【００８７】
出口側搬送ローラ４８のニップ力を大きくすると、出口側搬送ローラ４８への印画紙Ｃの入り込みが悪化し、最悪の場合、出口側搬送ローラ４８の直前で印画紙Ｃが停止してしまうことが、ニップ力を変化させた実験の結果から判明した。また、入口側搬送ローラ４６のニップ力より出口側搬送ローラ４８のニップ力が大きいという関係になると、印画紙Ｃは完全に停止してしまうことにもなる。
【００８８】
この為、入口側搬送ローラ４６のニップ力をターン搬送抵抗に対し十分な搬送力を持つように設定すると共に出口側搬送ローラ４８のニップ力をこれより小さくし、図３に示すように入口側搬送ローラ４６に印画紙Ｃの先端がニップされた状態から、図４に示すように、ターンガイド５２の上部に複数設けられた複数のガイドリブ５２Ａに印画紙Ｃの先端が案内されて、最終的に印画紙Ｃが２組の搬送ローラ４６、４８にそれぞれニップされるようにする。そして、このニップされる際に、図５に示すように、出口側搬送ローラ４８の串形状ローラ４８Ｂが印画紙Ｃの剛性でニップの外側（矢印Ａで示す）へ押し動かされる程度の入口側搬送ローラ４６より小さな荷重に、出口側搬送ローラ４８のニップ力を設定することで、搬送性を向上するようにした。
【００８９】
次に、本実施の形態の作用を説明する。
【００９０】
搬送ローラ４２、４４、４６、４８がシート状の印画紙Ｃを挟持して複数列で搬送する。また、印画紙Ｃをターン部５４に導入する入口側搬送ローラ４６と印画紙Ｃをターン部５４から排出する出口側搬送ローラ４８とを有し、これらの間の印画紙Ｃの搬送経路に対向して、印画紙Ｃの先端を出口側搬送ローラ４８へ案内するターンガイド５２が位置することで、乳剤面を内周側として印画紙Ｃの搬送方向を曲げるターン部５４が、処理液内の印画紙Ｃの搬送経路の案内部材の一部として形成される。
【００９１】
そして、このターン部５４に配置される２組の搬送ローラの内の入口側搬送ローラ４６が、それぞれＳＥＢＳ系エラストマで形成されたフラットな表面を有する一対のフラット形状ローラ４６Ａで構成されている。
【００９２】
また、出口側搬送ローラ４８が、ターン部５４の内周側に配置されるフラット形状ローラ４８Ａとターン部５４の外周側に配置される串形状ローラ４８Ｂとの組み合わせで形成され、このフラット形状ローラ４８Ａの表面がＳＥＢＳ系エラストマで形成されている。さらに、ターンガイド５２にガイドリブ５２Ａを複数設け、串形状ローラ４８Ｂの各串駒５０間にこのガイドリブ５２Ａを入れ込むようにされている。
【００９３】
従って、このターン部５４に配置される２組の搬送ローラの内の入口側搬送ローラ４６を構成する一対のローラの表面がフラット形状ローラ４６Ａとされることで、印画紙Ｃとソフトローラとの間の接触面積が広がってこれらの間の摩擦係数が高まり、搬送力が大きくなる。さらに、入口側搬送ローラ４６を構成する一対のフラット形状ローラ４６Ａが、高い摩擦係数を示すＳＥＢＳ系エラストマで形成された軟質表面を有するローラとされることで、入口側搬送ローラ４６と印画紙Ｃとの間の摩擦力がさらに高まって、搬送力が一層大きくなる。
【００９４】
他方、串形状ローラ４８Ｂの各串駒５０間に入れ込まれたガイドリブ５２Ａに案内されて、印画紙Ｃの先端の出口側搬送ローラ４８への入り込みが向上するようになった。また、串形状ローラ４８Ｂと対向するフラット形状ローラ４８Ａの外層材料としてＳＥＢＳ系エラストマを採用することで、入口側搬送ローラ４６と同様に摩擦力が高まって、搬送力が一層大きくなる。
【００９５】
以上より、シート状の印画紙Ｃを複数列搬送する際における印画紙Ｃの蛇行及び搬送量のばらつきを小さくして、搬送性能を向上することができる。
【００９６】
この結果として、印画紙Ｃの搬送精度の向上、印画紙Ｃの処理品質の安定化及び、印画紙Ｃの整列等の品質の安定化を図ることが可能とされる。
【００９７】
一方、本実施の形態の搬送方式はベルト搬送方式と異なるので、コスト高とならず、また、ごみが入り込んだ場合でも印画紙Ｃの表面に傷が発生する等の問題が生じ難い。さらに、印画紙Ｃの表面上における液置換性が高く、現像の進行速度等の処理性能の部分的な低下の懸念も無い。
【００９８】
尚、上記実施の形態では、入口側搬送ローラ４６及び出口側搬送ローラ４８を構成するローラをそれぞれ一対のローラとしたが、搬送ローラ４４のように３本のローラにより構成されても良い。
【００９９】
【発明の効果】
以上説明したように、本発明の感光材料処理装置は上記の構成としたので、感光材料を複数列搬送する際のターン部でも、安価で簡単な構造により各搬送列の処理品質の安定化及び搬送精度の向上を図ることができるという優れた効果を有する。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係るプリンタプロセッサの斜視図である。
【図２】本発明の一実施の形態に係るプロセッサ部の断面図である。
【図３】本発明の一実施の形態に係るターン部の拡大断面図であって、入口側搬送ローラに印画紙の先端がニップされる状態を示す図である。
【図４】本発明の一実施の形態に係るターン部の拡大断面図であって、ターンガイドのガイドリブに印画紙の先端が案内される状態を示す図である。
【図５】本発明の一実施の形態に係るターン部の拡大断面図であって、２組の搬送ローラに印画紙がニップされる状態を示す図である。
【図６】本発明の一実施の形態に係るターン部を分解した状態の拡大斜視図である。
【図７】本発明の一実施の形態に係る入口側搬送ローラを構成するローラの断面図である。
【図８】ローラに大きなたわみが生じた状態を示す図である。
【図９】従来技術に係るベルト搬送方式の側面図である。
【符号の説明】
１０ プリンタプロセッサ
４６ 入口側搬送ローラ
４８ 出口側搬送ローラ
４８Ａ フラット形状ローラ
４８Ｂ 串形状ローラ
５２ ターンガイド
５２Ａ ガイドリブ
５４ ターン部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a photosensitive material processing apparatus capable of improving photosensitive material conveyance performance, and is suitable for a printer processor, for example.
[0002]
[Prior art]
For example, a photosensitive material processing apparatus (for example, a printer processor) that is an automatic developing machine is provided with a plurality of processing tanks containing processing liquids and water for color development, bleach-fixing, washing and stabilization, for example, A photosensitive material such as photographic paper is sequentially conveyed through the plurality of processing tanks so that the photosensitive material is developed.
[0003]
In other words, a processing rack having a large number of conveying rollers each composed of a plurality of rollers is inserted into each processing tank, and the conveying rollers sandwich the photosensitive material and convey the photosensitive material during the developing process.
[0004]
[Problems to be solved by the invention]
Here, the photosensitive material is transported in order to process the sheet-shaped photosensitive material in a plurality of processing tanks. At this time, the traveling direction of the photosensitive material is made U-shaped in each processing tank and between adjacent processing tanks. Need to turn. Further, since the conveyance resistance is very large in the turn portion where the photosensitive material is turned, defective passage of the photosensitive material is likely to occur, and it is necessary to improve the conveyance performance in the turn portion.
[0005]
In particular, in a conventional processing apparatus that conveys in a single row, a turn system composed of a conveyance roller composed of a pair of rollers and a conveyance guide that is a turn guide for guiding a photosensitive material is adopted. In the case of multi-row conveyance in which a plurality of rows are conveyed simultaneously using a conveyance roller, the surface length, which is the axial length of the conveyance roller, is increased corresponding to the plurality of rows, and the nip force applied to the photosensitive material in each row As a result, the nip load becomes smaller, and the conveying force acting on each photosensitive material becomes smaller than that during single-line conveyance.
[0006]
Therefore, when a plurality of rows are conveyed by this turn method, when a large nip load is applied in order to obtain the same conveying force as that of the conventional processing apparatus, as shown in FIG. A large deflection occurs in the roller, and the maximum gap t between the pair of rollers increases.
[0007]
Therefore, for example, when transporting in three rows, the transport force and transportability of the central row are reduced, and in the central row, the photosensitive material meanders increase, the photosensitive material transport delays, and within each transport row and within each transport row. Variations in the conveyance amount in which the conveyance speed of the photosensitive material differs between the rows become large, and uniform conveyance performance cannot be obtained in each row.
[0008]
On the other hand, in order to obtain uniform conveyance performance in each row, as shown in FIG. 9, the photosensitive material is sandwiched between the belt 114 wound around the tension roller 112 and the large-diameter center roller 116 and conveyed. It is also conceivable to adopt a belt conveyance system for the turn part. In other words, this belt conveyance method uses the deformable belt 114 and is not affected by the deflection of the roller, and thus has an advantage that a difference in conveyance performance between rows hardly occurs.
[0009]
However, the following disadvantages exist in the turn by the belt conveyance method.
[0010]
That is, as compared with the turn method including only the conveyance roller and the conveyance guide, the center roller 116 is required to have rigidity, so that the cost of the roller is high, and the belt 114 is also required, which increases the cost. Furthermore, since the number of parts increases, the structure becomes complicated, and an improvement in assembly accuracy is required to prevent the belt 114 from shifting on the tension roller 112, which further increases the cost.
[0011]
On the other hand, if dust enters between the belt 114 and the center roller 116, the residence time of the dust becomes longer than when the photosensitive material is nipped by a pair of rollers, and the surface of the photosensitive material is damaged. Problems are likely to occur.
[0012]
In the belt conveyance method, since the emulsion surface of the photosensitive material is in contact with either the center roller 116 or the belt 114 for a long time, the liquid replacement property on the surface of the photosensitive material is deteriorated, and the processing performance such as the developing speed is reduced. There is concern about partial decline.
[0013]
In addition, the reason why the conveyance performance such as high conveyance accuracy is required even in the case of multi-row conveyance is as follows. First, if there is a difference in the conveyance time in the same conveyance row or between the conveyance rows, For example, a development processing time difference occurs between the transport rows, and the processing quality of the photosensitive material in the same transport row and for each transport row is different.
[0014]
Furthermore, in the case of multi-row transport, the photosensitive material originally transported in a row is distributed into a plurality of rows and developed in a plurality of rows, respectively, but the photosensitive material arranged in a plurality of rows is developed. It is necessary to return to the line again from the necessity for accumulation later. In other words, it is necessary to reduce the meandering of the photosensitive material and the difference in transport time within each transport column and between transport columns in order to ensure the quality of the alignment of the photosensitive material in the returning process to return to one row. is there.
[0015]
In addition, a roller made of silicon rubber is known as a roller having high conveyance performance here, but silicon rubber has low chemical resistance outside the processing solution in the bleach-fixing tank and washing tank, and is expensive, so it is costly. Disadvantages are great and not suitable for use.
[0016]
In consideration of the above-described facts, the present invention provides a photosensitive material processing apparatus capable of stabilizing the processing quality of each transport row and improving the transport accuracy with an inexpensive and simple structure even when the photosensitive material is transported in a plurality of rows. The purpose is to obtain.
[0017]
[Means for Solving the Problems]
The photosensitive material processing apparatus according to claim 1 is a photosensitive material processing apparatus that incorporates a processing tank in which a processing solution is stored, and that conveys the sheet-shaped photosensitive material inside and outside the processing tank by a conveying roller in a plurality of rows. And
The turn part that bends the conveying direction of the photosensitive material with the emulsion surface as the inner peripheral side,
An entrance-side conveying roller for introducing a photosensitive material;
An exit side conveying roller for discharging the photosensitive material;
A turn guide positioned opposite to the photosensitive material conveying path between the two sets of conveying rollers and guiding the leading edge of the photosensitive material to the outlet-side conveying roller;
And is configured as a part of the guide member of the photosensitive material in the processing tank,
The entrance-side transport roller is composed of a plurality of rollers each having a flat surface made of SEBS elastomer.
[0018]
A photosensitive material processing apparatus according to a second aspect of the present invention is a photosensitive material processing apparatus in which a processing tank in which a processing solution is stored is built in, and a sheet-like photosensitive material is sandwiched by a transport roller inside and outside the processing tank and transported in a plurality of rows. And
The turn part that bends the conveying direction of the photosensitive material with the emulsion surface as the inner peripheral side,
An entrance-side conveying roller for introducing a photosensitive material;
An exit side conveying roller for discharging the photosensitive material;
A turn guide positioned opposite to the photosensitive material conveying path between the two sets of conveying rollers and guiding the leading edge of the photosensitive material to the outlet-side conveying roller;
And is configured as a part of the guide member of the photosensitive material in the processing tank,
The exit-side transport roller is formed by a combination of a flat-shaped roller disposed on the inner peripheral side of the turn part and a surface formed of a SEBS-based elastomer, and a skewer-shaped roller disposed on the outer peripheral side of the turn part,
A plurality of guide ribs are provided on the turn guide, and the guide ribs are inserted between the skewer pieces of the skewer-shaped rollers.
[0019]
The photosensitive material processing apparatus according to a third aspect is the photosensitive material processing apparatus according to the first aspect, wherein a maximum gap caused by a nip force between a plurality of rollers constituting the entrance-side transport roller is 1/3 or less of the thickness of the photosensitive material. It is characterized by being.
[0020]
A photosensitive material processing apparatus according to a fourth aspect of the present invention is the photosensitive material processing apparatus according to the second aspect, wherein the entrance-side transport rollers are each composed of a plurality of rollers each having a flat surface formed of SEBS-based elastomer. The nip force is set to be smaller than the nip force of the entrance side conveying roller.
[0021]
The operation of the photosensitive material processing apparatus according to claim 1 will be described below.
[0022]
A conveying roller composed of a plurality of rollers sandwiches the sheet-like photosensitive material inside and outside the processing tank in which the processing liquid is stored, and conveys it in a plurality of rows. In addition, it has an entrance-side transport roller for introducing the photosensitive material into the turn portion and an exit-side transport roller for discharging the photosensitive material from the turn portion, and faces the photosensitive material transport path between them, and the leading edge of the photosensitive material Is positioned as a part of the guide member of the photosensitive material in the processing solution by positioning the turn guide that guides the toner to the exit-side transport roller. .
[0023]
Of the two sets of transport rollers disposed in the turn portion, the entrance-side transport roller is composed of a plurality of rollers each having a flat surface formed of SEBS elastomer.
[0024]
Accordingly, a plurality of rollers constituting the entrance-side transport roller of the two sets of transport rollers arranged in the turn portion are formed into flat-shaped rollers having a smooth surface, so that the photosensitive material and these flat-shaped rollers The contact area between them increases, the coefficient of friction between them increases, and the conveying force increases. Further, the pair of rollers constituting the entrance-side transport roller is a roller having a soft surface formed of a SEBS elastomer having a high friction coefficient, so that the frictional force between the transport roller and the photosensitive material is further increased. As a result, the conveying force is further increased.
[0025]
For this reason, it is possible to improve the conveyance performance by reducing the meandering of the photosensitive material and the variation in the conveyance amount when conveying a plurality of rows of sheet-shaped photosensitive materials.
[0026]
As a result, it is possible to improve the conveyance accuracy of the photosensitive material, stabilize the processing quality of the photosensitive material, and stabilize the quality such as alignment of the photosensitive material.
[0027]
On the other hand, since the conveyance method of this claim is different from the belt conveyance method, the cost is not high, and even when dust enters, problems such as scratches on the surface of the photosensitive material hardly occur. Further, the liquid replacement property on the surface of the photosensitive material is high, and there is no fear of partial deterioration in processing performance such as development speed.
[0028]
The operation of the photosensitive material processing apparatus according to claim 2 will be described below.
[0029]
This claim has the same configuration as that of claim 1 and operates in the same manner. However, in this claim, instead of limiting the material and shape of the entrance-side transport roller, the exit-side transport roller is a flat roller disposed on the inner peripheral side of the turn part and a skewer disposed on the outer peripheral side of the turn part. It is formed by a combination with a shape roller, and the surface of the flat shape roller is configured by a SEBS elastomer. Furthermore, a plurality of guide ribs are provided on the turn guide, and the guide ribs are inserted between the skewer pieces of the skewer-shaped rollers.
[0030]
Therefore, with the configuration as described above, the guide ribs inserted between the skewers of the skewer-shaped rollers are guided to improve the entrance of the leading edge of the photosensitive material into the exit-side transport roller. Further, by adopting SEBS elastomer as the outer layer material of the flat roller facing the skewer roller, a significant improvement in the conveyance performance was recognized as in the case of the inlet side conveyance roller.
[0031]
For this reason, as in the first aspect, the meandering of the photosensitive material and the variation in the transport amount when transporting a plurality of rows of sheet-shaped photosensitive materials can be reduced, the transport performance can be improved, and the transport accuracy of the photosensitive material can be improved. It was possible to stabilize the processing quality of the photosensitive material and to stabilize the quality such as alignment of the photosensitive material.
[0032]
On the other hand, since the conveying system of this claim is also different from the belt conveying system, the same effect as that of the first aspect is obtained.
[0033]
The operation of the photosensitive material processing apparatus according to claim 3 will be described below.
[0034]
This claim has the same configuration as that of claim 1 and operates in the same manner. However, the present invention has a configuration in which the maximum gap generated by the nip force between a plurality of rollers constituting the entrance-side transport roller is set to 1/3 or less of the thickness of the photosensitive material.
[0035]
In other words, the roller is deflected by the nip force, and a maximum gap is formed in the center in the width direction of the conveyance roller. However, when this maximum gap is set to about 1/3 or less of the thickness of the photosensitive material, for example, when conveying in three rows In FIG. 5, the conveyance delay and the variation in the conveyance amount in the central row are within the allowable range.
[0036]
The operation of the photosensitive material processing apparatus according to claim 4 will be described below.
[0037]
This claim has the same configuration as that of claim 2 and operates in the same manner. However, in this claim, the entrance-side transport roller is composed of a plurality of rollers each having a flat surface formed of SEBS elastomer, and the nip force of the exit-side transport roller is set smaller than the nip force of the entrance-side transport roller. It has the composition which is done.
[0038]
That is, when the nip force of the exit side transport roller is increased, the photosensitive material enters the exit side transport roller and the photosensitive material may stop immediately before the exit side transport roller. Therefore, the nip force of the entrance-side transport roller is set so as to have a sufficient transport force with respect to the turn transport resistance, and the nip force of the exit-side transport roller is made smaller than this, and the photosensitive material is applied to each of the two transport rollers Conveyability is improved by setting the nip force of the exit-side transport roller to a smaller load than the entrance-side transport roller so that the exit-side transport roller is pushed to the outside of the nip due to the rigidity of the photosensitive material when nipping. I tried to do it.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
A photosensitive material processing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
[0040]
FIG. 1 is a schematic perspective view of the overall configuration of a printer processor 10 which is a photosensitive material processing apparatus according to the present embodiment.
[0041]
The printer processor 10 includes a printer unit 12 and a processor unit 14. The printer unit 12 prints an image of the negative film N set on the negative carrier 16 onto a photographic paper C that is a photosensitive material, and the processor unit 14. It is supposed to be transported to.
[0042]
The photographic paper C in the form of a roll is loaded into the printer unit 12, but is cut into a sheet shape in the printer unit 12 for convenience of processing, and the printing process is performed while being transported in a single row in this cut state. Is done. Then, due to the difference in processing speed between the printer unit 12 and the processor unit 14, the sheet-like photographic paper C is sorted into a plurality of rows by a sorting device (not shown) and conveyed to the processor unit 14 side.
[0043]
As shown in FIG. 2, the processor unit 14 includes a developing tank 22, a bleach-fixing tank 24, a first water washing tank 26, a second water washing tank 28, a third water washing tank 30, a fourth water washing tank 32, and a drying unit (see FIG. 2). (Not shown) is provided, and the photographic printing paper C conveyed from the printer unit 12 is developed.
[0044]
That is, in the processor unit 14, a developing tank 22, a bleach-fixing tank 24, a first washing tank 26, a second washing tank 28, a third washing tank 30, and a fourth washing tank 32, which are processing tanks, are arranged in series. In addition, a predetermined amount of each processing solution for processing the photographic paper C, such as a developing solution, a bleach-fixing solution, and washing water is filled. A plurality of sets of transport rollers each composed of a plurality of rollers are rotatably supported by a processing rack (not shown) so that the sheet-like printing paper C can be sandwiched and sequentially transported in a plurality of rows. This processing rack is installed in each of these processing tanks.
[0045]
For this reason, the sheet-like printing paper C is continuously put in each processing tank by rotating the carrying roller by a driving force transmitted from a driving source (not shown) and carrying the printing paper C in a plurality of rows. Development processing.
[0046]
Specifically, as shown in FIG. 2, in the crossover portion 36 located at the upper part of each processing tank and outside the processing liquid upstream and downstream in the conveyance direction of the photographic paper C with respect to each processing tank. In the portion, a conveying roller 42 for the crossover portion 36 is disposed, which is composed of a pair of soft flat rollers each having a diameter of 20 mm, a hardness of 60 ° or less, and a soft surface of 45 ° or more. The soft flat roller has a smooth surface and an average surface roughness of 3.2 μm or less.
[0047]
In the processing liquid in the developing tank 22, seven sets of transport rollers 44 are arranged side by side along the vertical direction. Further, these seven sets of conveying rollers 44 are each provided with a soft flat roller having a diameter of 30 mm and a pair of hard flat rollers made of polyphenylene ether (hereinafter simply referred to as PPE) having a diameter of 20 mm on both sides of the soft flat roller having a diameter of 30 mm. It has become a form.
[0048]
At the lowermost end of the developing tank 22, a turn portion 54 for bending the conveying direction of the photographic paper C with the emulsion surface as the inner peripheral side is disposed as a part of the guide member for the photographic paper C in the processing liquid. Yes. The turn section 54 is provided with an inlet-side transport roller 46 for introducing the photographic paper C into the turn section 54 and an outlet-side transport roller 48 for discharging the photographic paper C from the turn section 54.
[0049]
As shown in FIGS. 3 and 6, the entrance-side transport roller 46 is formed by a flat roller 46A which is a pair of soft flat rollers each having a flat surface and a diameter of 20 mm. Further, the exit-side conveying roller 48 includes a flat roller 48A which is a soft flat roller having a flat surface and a diameter of 20 mm disposed on the inner peripheral side of the turn portion 54, and a skewer disposed on the outer peripheral side of the turn portion 54. It is formed by a combination with a skewer-shaped roller 48B, which is a hard skewered roller having a diameter of 20 mm and formed of PPE. Further, of the rollers constituting the conveying roller of the turn portion 54, the surfaces of the flat rollers 46A and 48A are smooth and the average surface roughness is 3.2 μm or less, and the hardness is 60 ° or less and 45 ° or more. It is made of a SEBS elastomer that has a soft surface.
[0050]
A turn guide 52 for guiding the leading edge of the photographic paper C to the outlet-side conveyance roller 48 is opposed to the conveyance path of the photographic paper C between the two sets of conveyance rollers below the pair of conveyance rollers 46 and 48. The plurality of guide ribs 52A provided at the upper part of the turn guide 52 are inserted between the plurality of large-diameter skewer pieces 50 that form the skewer-shaped rollers 48B, and the skewer pieces 50 and the guide ribs 52A are inserted. And are overlapped.
[0051]
Further, the nip force of the exit-side transport roller 48 is set to be smaller than the nip force of the entrance-side transport roller 46, and the maximum gap t in the nip portion of the exit-side transport roller 48 caused by the nip force between the pair of rollers is usually The thickness is set to 1/3 or less of the thickness of the photographic paper C to be processed. Further, the nip force of the entrance-side transport roller 46 is such that the maximum gap t at the nip portion of the entrance-side transport roller 46 generated by the nip force between the pair of rollers is 1/3 or less of the thickness of the photographic paper C to be processed normally. Is set to
[0052]
On the other hand, as shown in FIG. 2, in the processing solution of the bleach-fixing tank 24, as in the developing tank 22, seven sets of conveying rollers 44 are arranged side by side. However, although the uppermost transport roller 44 has the same configuration as the transport roller of the developing tank 22, the second and subsequent transport rollers 44 from the top are 30 mm in diameter instead of the 30 mm diameter soft flat roller. Instead of a pair of hard flat rollers with a diameter of 20 mm, a soft wart with a diameter of 20 mm having a soft surface with a hardness of 60 ° or less and a warped protrusion on the surface of the roller. There is a difference with respect to the developing tank 22 that a roller is used.
[0053]
At the lowermost end of the bleach-fixing tank 24, the same inlet-side conveying roller 46, outlet-side conveying roller 48 and turn guide 52 (not shown in FIG. 2) as those in the developing tank 22 are arranged.
[0054]
Further, in the flush water from the first flush tank 26 to the fourth flush tank 32, three sets of transport rollers 44 are arranged along the vertical direction. Of these, the uppermost transport roller 44 has the same configuration as the transport roller 44 of the developing tank 22, and the other two pairs of transport rollers 44 are the second and subsequent transport rollers 44 from the top of the bleach-fixing tank 24. It is set as the same structure.
[0055]
Further, at the lowermost end portion of the processing tank from the first water washing tank 26 to the fourth water washing tank 32, the same inlet side conveying roller 46, outlet side conveying roller 48 and turn guide 52 (in FIG. (Not shown) is arranged.
[0056]
Accordingly, as shown in FIG. 2, the photographic paper C is sandwiched between the transport rollers 44 and transported downward in the processing tanks, and then is a turn section composed of an entrance-side transport roller 46 and an exit-side transport roller 48. The conveyance direction is changed at 54 and the sheet is conveyed by the conveyance roller 44 in the upward direction. Further, when discharged from the inside of the processing tank, it is nipped by the transport roller 42 of the crossover portion 36 and sent to the next processing tank, and is similarly transported in the next processing tank.
[0057]
On the other hand, the nip pressure of the transport roller 44 is, for example, about 370 gf, the nip pressure of the entrance-side transport roller 46 is, for example, about 1660 gf, and the nip pressure of the exit-side transport roller 48 is, for example, about 310 gf. The nip pressure of the transport roller 42 is about 1400 gf, for example.
[0058]
Here, the conveyance roller surface length is 230 mm or more and 360 mm or less, the nip pressure of the conveyance roller 44 is 170 gf or more and 560 gf or less, the nip pressure of the inlet side conveyance roller 46 is 1300 gf or more and 2050 gf or less, and the nip pressure of the outlet side conveyance roller 48 When the nip pressure of the conveying roller 42 for the crossover portion 36 is in the range of 550 gf or more and 1700 gf or less in the range of 170 gf or more and 580 gf or less, the roller whose surface hardness is 60 ° or less and the surface is made of SEBS elastomer prevents the meandering and conveyance Very high effect on accuracy.
[0059]
Next, the function and structure of the entrance-side transport roller 46 will be specifically described below.
[0060]
When the photographic printing paper C is transported, the transport resistance of the turn section 54 is maximized in the processing tank. Therefore, by increasing the transport force of the entrance-side transport roller 46 of the turn section 54, the transport performance at the turn section 54 is improved. .
[0061]
When the conveying force was compared under various conditions, it was found that the conveying force was increased when a conveying roller formed of a pair of soft flat rollers each having a flat surface was used as the inlet-side conveying roller 46.
[0062]
In other words, when transported by being sandwiched between transport rollers composed of a pair of flat rollers (represented as “flat and flat”), and transported by being sandwiched between transport rollers in which one roller is replaced with a wart roller Table 1 is a graph showing data when compared (represented as “flat and warped”).
[0063]
[Table 1]

From Table 1, it can be seen that the conveying force by the conveying roller composed of a pair of flat rollers is larger than the conveying force by the conveying roller using one roller as a wart roller, and by using the conveying roller as a pair of flat rollers, Further improvement in the meandering of the photographic paper C and the variation in the conveyance amount can be achieved, and the conveyance performance is improved.
[0064]
In the case of multi-row conveyance such as two-row conveyance or three-row conveyance, the conveyance force becomes 1/2 and 1/3 that of single-row conveyance, and the absolute value of the conveyance force decreases.
[0065]
On the other hand, the coefficient of friction between the olefin elastomer roller and SEBS elastomer roller and the emulsion surface of the photographic paper C (represented by “Em surface touch”) and the back surface of the olefin elastomer roller and SEBS elastomer roller and the photographic paper C Table 2 is a graph showing data of the results of this experiment.
[0066]
[Table 2]

From this graph, it can be seen that the friction coefficient due to the contact between the soft roller and the emulsion surface of the photographic paper C is larger than the friction coefficient due to the contact between the soft roller and the back surface of the photographic paper C. In other words, from this experimental result, by installing a soft roller facing the emulsion surface side of the photographic paper C, the conveyance force is increased, and it is possible to further improve the meandering of the photographic paper C and variations in the conveyance amount.
[0067]
Furthermore, since the conveyance resistance is large, the conveyance force difference between the roller materials due to the difference in dynamic friction coefficient in the entrance-side conveyance roller 46 that requires a large conveyance force and requires a large nip force (for example, about 1660 gf). Is noticeably generated, and the olefin-based elastomer roller is insufficient in conveying force.
[0068]
For this reason, by adopting SEBS elastomer as the material of the soft roller, the friction coefficient is increased, the conveying force is increased, and further significant improvement in the conveying performance is expected.
[0069]
From the above results, a difference in conveyance accuracy as shown in Table 3 representing measurement data of the conveyance time appears. Here, thermolan is a kind of olefin elastomer and lavalon is a kind of SEBS elastomer.
[0070]
[Table 3]

As shown in Table 3, at the time of three-row conveyance, the olefin-based elastomer roller has a larger conveyance time difference between the conveyance rows and more time variation in each conveyance row than the SEBS-based elastomer roller. In Table 3, the greater the distance between x and x in each column, the greater the time variation.
[0071]
Next, the function and structure of the outlet side conveyance roller 48 will be specifically described below.
[0072]
When the photographic paper C is turned with a small radius of curvature in the direction opposite to the natural curling direction of the photographic paper C, the entry angle of the leading edge of the photographic paper C to the outlet-side transport roller 48 increases due to the curling of the photographic paper C, and the exit The side conveyance roller 48 enters the nip position very badly and tends to cause a conveyance delay.
[0073]
This conveyance delay is not improved even if the nip force of the entrance-side transport roller 46 is increased to increase the transport force, and cannot be improved unless the leading edge of the photographic paper C enters the exit-side transport roller 48. is there.
[0074]
Therefore, in the present embodiment, the exit-side transport roller 48 is formed by a combination of a flat roller 48A disposed on the inner peripheral side of the turn portion 54 and a skewer roller 48B disposed on the outer peripheral side of the turn portion 54. Further, a plurality of guide ribs 52A are provided on the upper part of the turn guide 52, and the guide ribs 52A are inserted between the skewer pieces 50 of the skewer-shaped roller 48B so that the skewer pieces 50 and the guide ribs 52A overlap each other.
[0075]
As a result, it is guided by the guide rib 52A inserted between the skewer pieces 50 of the skewer-shaped roller 48B, so that the entrance of the leading edge of the photographic paper C into the outlet-side transport roller 48 is improved, and a transport delay is prevented. The possibility that the photographic paper C would stop for a moment at the turn part 54 was solved.
[0076]
Further, by adopting SEBS elastomer as the outer layer material of the flat roller 48A facing the skewer roller 48B, an improvement in the transport performance was recognized as in the case of the inlet-side transport roller 46 described above.
[0077]
Next, the structure for preventing roller deflection will be specifically described below.
[0078]
As shown in FIG. 8, the roller is deflected by the nip force, and a maximum gap t is formed at the center in the width direction of the pair of rollers. If the roller bending rigidity is insufficient with respect to the applied nip load, the gap becomes large. For example, when the photographic paper C is conveyed in three rows, there is a conveyance delay in the central row and variations in the conveyance amount. Become prominent. As a result, problems such as overlapping of photographic papers C transported in the same row and differences in processing quality between rows occur.
[0079]
On the other hand, by adjusting the bending rigidity of the rollers, the gap between the pair of rollers caused by the deflection of the rollers is changed to 0.174 mm, 0.066 mm, 0.046 mm, for example, as shown in Table 4. From the graph of the experimental data, it has been found that by reducing the gap between the pair of rollers, it is possible to suppress the conveyance delay and the variation in the conveyance amount.
[0080]
[Table 4]

Further, an experiment was conducted to confirm the relationship between the conveyance delay and conveyance amount variation in the central row and the gap between the pair of rollers, and Table 5 showing the relationship between the conveyance delay in the central row and the size of the maximum gap t. And the result like Table 6 showing the relationship between the dispersion | variation in the conveyance amount of a center row | line | column and the magnitude | size of the largest clearance t was obtained.
[0081]
[Table 5]

[0082]
[Table 6]

From this result, it can be seen that when the maximum gap t becomes smaller, the conveyance delay of the central row and the variation in the conveyance amount of the central row become smaller. However, the maximum gap t = 0.05 mm that is allowed as the variation in the conveyance amount. About 0.05 mm is the maximum allowable gap between the pair of rollers. Then, 0.05 mm, which is the maximum allowable gap between the pair of rollers forming the transport roller, is usually about 1/3 of the thickness of the photographic paper C to be processed.
[0083]
Therefore, in order to satisfy this condition, as shown in FIG. 7, the soft flat roller of the entrance side conveying roller 46 of the turn portion 54 is covered with the resin pipe 64 around the metal pipe 62, and the outer periphery of the resin pipe 64. Is covered with an elastomer layer 66, and a shaft end portion 68 fixed to both ends of the soft flat roller by ultrasonic welding or adhesion is closed at both ends of the soft flat roller. That is, a structure is adopted in which the metal pipe 62 is inserted into the hollow resin pipe 64 to increase the bending rigidity.
[0084]
Furthermore, as the material of the resin pipe 64 forming these soft flat rollers, PPE (trade name Iupiace made by Mitsubishi Engineering Plastics) is adopted, and as the material of the metal pipe 62, SUS316 which is a kind of stainless steel is adopted. As the material of the elastomer layer 66, SEBS (hydrogenated SBS) elastomer (product name: Lavalon, manufactured by Mitsubishi Chemical), which is a thermoplastic elastomer, was used.
[0085]
In addition, as a method of manufacturing this soft flat roller, a metal pipe 62 is press-fitted into the inner periphery of an extruded or injection-molded resin pipe 64, and SEBS-based elastomer is injection-molded into the outer periphery thereof, or extrusion or injection-molding. It is conceivable to coat the formed SEBS elastomer tube. Further, it is conceivable that a thermoplastic resin is injection-molded on the outer periphery of the metal pipe 62, and further, an SEBS-based elastomer is injection-molded on the outer periphery, or an extruded or injection-molded SEBS-based elastomer tube is covered.
[0086]
Next, the setting of the nip force of the two sets of conveying rollers will be specifically described below.
[0087]
If the nip force of the exit-side transport roller 48 is increased, the entry of the photographic paper C into the exit-side transport roller 48 deteriorates. In the worst case, the photographic paper C may stop immediately before the exit-side transport roller 48. From the result of the experiment in which the nip force was changed, it was found out. In addition, if the nip force of the exit-side transport roller 48 is greater than the nip force of the entrance-side transport roller 46, the photographic paper C will also stop completely.
[0088]
Therefore, the nip force of the entrance side transport roller 46 is set so as to have a sufficient transport force with respect to the turn transport resistance, and the nip force of the exit side transport roller 48 is made smaller than this, as shown in FIG. As shown in FIG. 4, the leading end of the photographic paper C is guided to a plurality of guide ribs 52 </ b> A provided at the upper part of the turn guide 52 from the state where the leading edge of the photographic paper C is nipped by the conveying roller 46. In addition, the photographic paper C is nipped by the two sets of transport rollers 46 and 48, respectively. Then, at the time of this nip, as shown in FIG. 5, the skewer-shaped roller 48B of the exit side conveying roller 48 is pushed to the outside of the nip (indicated by arrow A) with the rigidity of the photographic paper C. By setting the nip force of the exit-side transport roller 48 to a load smaller than that of the transport roller 46, the transportability is improved.
[0089]
Next, the operation of the present embodiment will be described.
[0090]
Conveying rollers 42, 44, 46 and 48 sandwich the sheet-like printing paper C and convey it in a plurality of rows. Further, it has an entrance-side transport roller 46 that introduces the photographic paper C into the turn section 54 and an exit-side transport roller 48 that discharges the photographic paper C from the turn section 54, and faces the transport path of the photographic paper C between them. Then, the turn guide 52 that guides the leading edge of the photographic paper C to the outlet-side transport roller 48 is positioned, whereby the turn portion 54 that bends the transport direction of the photographic paper C with the emulsion surface as the inner peripheral side is provided in the processing liquid. It is formed as a part of the guide member for the conveyance path of the photographic paper C.
[0091]
Of the two sets of transport rollers disposed in the turn portion 54, the entrance-side transport roller 46 is composed of a pair of flat rollers 46A each having a flat surface made of SEBS elastomer.
[0092]
Further, the exit-side conveying roller 48 is formed by a combination of a flat-shaped roller 48A disposed on the inner peripheral side of the turn portion 54 and a skewer-shaped roller 48B disposed on the outer peripheral side of the turn portion 54. The surface of 48A is formed of SEBS elastomer. Further, a plurality of guide ribs 52A are provided on the turn guide 52, and the guide ribs 52A are inserted between the skewer pieces 50 of the skewer-shaped roller 48B.
[0093]
Therefore, the surface of the pair of rollers constituting the inlet side conveyance roller 46 of the two sets of conveyance rollers arranged in the turn portion 54 is formed as a flat roller 46A, so that the photographic paper C and the soft roller The contact area between them increases, the coefficient of friction between them increases, and the conveying force increases. Further, the pair of flat rollers 46A constituting the entrance-side transport roller 46 is a roller having a soft surface formed of a SEBS-based elastomer exhibiting a high friction coefficient, so that the entrance-side transport roller 46 and the photographic paper C The frictional force between the two is further increased, and the conveying force is further increased.
[0094]
On the other hand, the guide ribs 52A inserted between the skewer pieces 50 of the skewer-shaped roller 48B are guided to improve the entrance of the leading edge of the photographic paper C into the outlet-side transport roller 48. Further, by adopting SEBS elastomer as the outer layer material of the flat roller 48A facing the skewer roller 48B, the frictional force is increased similarly to the entrance-side transport roller 46, and the transport force is further increased.
[0095]
As described above, it is possible to reduce the meandering of the photographic paper C and the variation in the conveyance amount when the sheet-like photographic paper C is conveyed in a plurality of rows, thereby improving the conveyance performance.
[0096]
As a result, it is possible to improve the conveyance accuracy of the photographic paper C, stabilize the processing quality of the photographic paper C, and stabilize the quality such as the alignment of the photographic paper C.
[0097]
On the other hand, since the conveyance system of the present embodiment is different from the belt conveyance system, the cost is not high, and even when dust enters, problems such as scratches on the surface of the photographic paper C hardly occur. Further, the liquid replacement property on the surface of the photographic paper C is high, and there is no fear of partial deterioration of the processing performance such as the developing speed.
[0098]
In the above-described embodiment, the rollers constituting the entrance-side transport roller 46 and the exit-side transport roller 48 are each a pair of rollers. However, the transport roller 44 may be composed of three rollers.
[0099]
【The invention's effect】
As described above, the photosensitive material processing apparatus of the present invention has the above-described configuration. Therefore, even in the turn portion when the photosensitive material is transported in a plurality of rows, the processing quality of each transport row is stabilized by an inexpensive and simple structure. It has an excellent effect that the conveyance accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a printer processor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a processor unit according to an embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view of a turn portion according to an embodiment of the present invention, showing a state in which a leading edge of a photographic paper is nipped by an entrance-side transport roller.
FIG. 4 is an enlarged cross-sectional view of a turn portion according to an embodiment of the present invention, and shows a state in which a leading edge of a photographic paper is guided by a guide rib of the turn guide.
FIG. 5 is an enlarged cross-sectional view of a turn portion according to an embodiment of the present invention, and is a view showing a state in which photographic paper is nipped between two sets of conveying rollers.
FIG. 6 is an enlarged perspective view of a state in which a turn part according to an embodiment of the present invention is disassembled.
FIG. 7 is a cross-sectional view of a roller constituting an entrance-side transport roller according to an embodiment of the present invention.
FIG. 8 is a diagram showing a state in which a large deflection has occurred in a roller.
FIG. 9 is a side view of a belt conveyance system according to a conventional technique.
[Explanation of symbols]
10 Printer processor
46 Inlet transport roller
48 Outlet side transport roller
48A flat roller
48B skewer roller
52 Turn guide
52A Guide rib
54 Turn part

Claims (4)

A photosensitive material processing apparatus that incorporates a processing tank in which a processing solution is stored, conveys a plurality of rows of sheet-shaped photosensitive materials inside and outside the processing tank by conveying rollers,
The turn part that bends the conveying direction of the photosensitive material with the emulsion surface as the inner peripheral side,
An entrance-side conveying roller for introducing a photosensitive material;
An exit side conveying roller for discharging the photosensitive material;
A turn guide positioned opposite to the photosensitive material conveying path between the two sets of conveying rollers and guiding the leading edge of the photosensitive material to the outlet-side conveying roller;
And is configured as a part of the guide member of the photosensitive material in the processing tank,
A photosensitive material processing apparatus, wherein the entrance-side transport roller is composed of a plurality of rollers each having a flat surface formed of an SEBS elastomer. A photosensitive material processing apparatus that incorporates a processing tank in which a processing solution is stored, conveys a plurality of rows of sheet-shaped photosensitive materials inside and outside the processing tank by conveying rollers,
The turn part that bends the conveying direction of the photosensitive material with the emulsion surface as the inner peripheral side,
An entrance-side conveying roller for introducing a photosensitive material;
An exit side conveying roller for discharging the photosensitive material;
A turn guide positioned opposite to the photosensitive material conveying path between the two sets of conveying rollers and guiding the leading edge of the photosensitive material to the outlet-side conveying roller;
And is configured as a part of the guide member of the photosensitive material in the processing tank,
The exit-side transport roller is formed by a combination of a flat-shaped roller disposed on the inner peripheral side of the turn part and a surface formed of a SEBS-based elastomer, and a skewer-shaped roller disposed on the outer peripheral side of the turn part,
A photosensitive material processing apparatus, wherein a plurality of guide ribs are provided on a turn guide, and the guide ribs are inserted between each skewer piece of a skewer-shaped roller. 2. The photosensitive material processing apparatus according to claim 1, wherein a maximum gap caused by a nip force between a plurality of rollers constituting the entrance side conveying roller is set to 1/3 or less of a thickness of the photosensitive material. The entrance-side transport roller is composed of a plurality of rollers each having a flat surface formed of SEBS elastomer, and the nip force of the exit-side transport roller is set smaller than the nip force of the entrance-side transport roller. The photosensitive material processing apparatus according to claim 2.

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