JPH0347557U

JPH0347557U -

Info

Publication number: JPH0347557U
Application number: JP10840689U
Authority: JP
Priority date: 1989-09-18
Filing date: 1989-09-18
Publication date: 1991-05-02

Description

[Brief explanation of the drawing]

第１図は本案の電子写真方式の両面レーザビー
ムプリンタの縦断面図、第２図〜第５図は定着器
における記録紙駆動方向制御機構を示す図、第６
図はエンドレス転写ベルトと第２の方向切換えレ
バーとガイドの関係を示した斜視図、第７図は該
レーザビームプリンタを用いた印刷装置のブロツ
ク図、第８図は動作タイムチヤート、第９図、第
１０図は制御フローチヤート、第１１図〜第１６
図は記録紙搬送状態説明図、第１７図、第１８図
は位置関係説明模式図、第１９図は記録紙搬送手
段の変形例を示す図、第２０図は割込時の記録紙
搬送状態説明図である。２……感光ドラム、３……帯電器、４……レー
ザビーム露光装置、５……現像器、７……エンド
レス転写ベルト、１０……記録紙、１１……駆動
ローラ、１２……従動ローラ、１９……ベルト帯
電器、２７……定着装置、３６……第２の方向切
換レバー、３７……ガイド、３８……ギヤユニツ
ト、４４……制御装置、４６……情報処理装置。 FIG. 1 is a vertical sectional view of the electrophotographic double-sided laser beam printer of the present invention, FIGS. 2 to 5 are diagrams showing the recording paper drive direction control mechanism in the fixing device, and FIG.
The figure is a perspective view showing the relationship between the endless transfer belt, the second direction switching lever, and the guide, FIG. 7 is a block diagram of a printing device using the laser beam printer, FIG. 8 is an operation time chart, and FIG. 9 , FIG. 10 is a control flowchart, and FIGS. 11 to 16.
17 and 18 are schematic diagrams illustrating the positional relationship. FIG. 19 is a diagram showing a modification of the recording paper conveyance means. FIG. 20 is the recording paper conveyance state at the time of interruption. It is an explanatory diagram. 2... Photosensitive drum, 3... Charger, 4... Laser beam exposure device, 5... Developer, 7... Endless transfer belt, 10... Recording paper, 11... Drive roller, 12... Driven roller , 19... Belt charger, 27... Fixing device, 36... Second direction switching lever, 37... Guide, 38... Gear unit, 44... Control device, 46... Information processing device.

Claims

[Scope of Claim for Utility Model Registration] 1. From an electrophotographic system using a photoreceptor, a charger, an exposure device, a developing device, a transfer belt, etc., a paper feeding device, and a drive device for driving the paper feeding device, etc. This image recording device is characterized in that the roller diameter of the transfer belt is set to a large diameter on the upstream side of paper conveyance and a small diameter on the downstream side, and the fixing device is controlled to rotate in forward and reverse directions, thereby making it possible to print on both sides of the paper. Printing device. 2. A double-sided printing device according to claim 1, characterized in that the direction switching lever is provided with a fixing device between the transfer belts. 3. The double-sided printing apparatus according to claim 2, further comprising a guide provided at a position opposite to the direction switching lever to guide the transfer belt toward the side opposite to the photosensitive drum. 4. The double-sided printing device according to claim 3, characterized in that the guide tip extends below the transfer belt. 5. The double-sided printing apparatus according to claim 1, characterized in that an auxiliary roller is provided on the side of the transfer belt opposite to the photosensitive drum, which is grounded directly or through a resistor, a varistor, or the like. 6 In claim 1, the angle θ ₁ formed by the paper transport line between the large diameter side of the transfer belt and the tangent of the lower roller of the fixing device is the angle between the extension line of the plane on the small diameter side of the transfer belt and the paper transport line. A double-sided printing device characterized in that θ is equal to or smaller than ₂ .