JPH02104363U

JPH02104363U -

Info

Publication number: JPH02104363U
Application number: JP1243689U
Authority: JP
Priority date: 1989-02-03
Filing date: 1989-02-03
Publication date: 1990-08-20

Description

[Brief explanation of drawings]

第１図ａは第１の考案の倍率変換機構の第１実
施例の平面図。第１図ｂは第１の考案の１実施例
の駆動系統要部を示す斜視図。第１図ｃは第１の
考案の第２の実施例の倍率変換機構の平面図。第
１図ｄ及び第１図ｅは第２の考案の実施例のピン
ト調節機構の平面図。第１図ｆは第２の考案の実
施例のピント調節機構の側断面図。第１図ｇは第
１の考案の実施例の１変形例の平面図。第２図は
本考案の画像形成装置の光学系関連部分を示す概
略図。第３図は一般の光路長変化方式変倍機構を
もつた画像形成装置の概略図。第４図は従来の倍
率変換機構の概要図。第５図は従来の露光走査を
作動させるワイヤの巻回状態を示す斜視図。１……本体フレーム、１Ｐ……ブラケツト、２
……光源ランプ、３……スリツト、４，５，６，
８……ミラー、７……投影レンズ、９……感光体
、１０……走査駆動モータ、１１，１３，１４ａ
，１５，１６ａ，１８，２１，２２ａ，２３……
プーリ、１２，１４，２２，２５，２６，４７…
…プーリ、１７，１７ａ，４８，１７７……フツ
ク、４０……レンズ移動台、４２……ラツク、４
３……スライドカム、４４……支軸、４５……フ
オロワ部材、４６……フオロワローラ、４７，１
７８，１７９……プーリ、５８……ステツピング
モータ、７０……移動滑車台、８５……カム、８
６……カムフオロワ、１７０，１９０……変倍プ
レート、１７１，１９１……基台プレート、１７
１Ａ，１７１Ｄ……壁、１７１Ｂ……ガイド壁、
１７１Ｃ，１９１Ｋ……補助プレート、１７１Ｆ
，１８６……調整ねじ、１７１Ｋ，１９１Ｍ……
クランプねじ、１７２，１７３，１９２，１９３
……ばねかけフツク、１７１Ｎ，１７４，１７４
ａ，１８５Ａ，１９４ａ……スプリング、１７５
……ガイド溝、１７６……ガイド部材、１７６Ｓ
，１９１Ｔ……ねじ、１８０……ピント調節台、
１８３Ａ，１８３Ｂ……スライド溝、１８４Ａ，
１８４Ｂ……ピン、１８５……ブラケツト、１９
１Ｇ……ガイド孔、１９１Ｌ……回転支軸、１９
１Ｐ……調節部、１９１Ｕ……ねじ孔、１９１Ｖ
……調節ねじ、１９１Ｙ……ばね、Ａ……第１走
行台、Ｂ……第２走行台、Ｗ_１，Ｗ_２，Ｗ_３……
ワイヤ。 FIG. 1a is a plan view of a first embodiment of the magnification conversion mechanism of the first invention. FIG. 1b is a perspective view showing the main parts of the drive system of an embodiment of the first invention. FIG. 1c is a plan view of the magnification conversion mechanism of the second embodiment of the first invention. 1d and 1e are plan views of the focus adjustment mechanism of the second embodiment of the invention. FIG. 1f is a side sectional view of the focus adjustment mechanism according to the second embodiment of the invention. FIG. 1g is a plan view of a modification of the embodiment of the first invention. FIG. 2 is a schematic diagram showing parts related to the optical system of the image forming apparatus of the present invention. FIG. 3 is a schematic diagram of an image forming apparatus having a general optical path length changing magnification mechanism. FIG. 4 is a schematic diagram of a conventional magnification conversion mechanism. FIG. 5 is a perspective view showing a winding state of a wire for operating conventional exposure scanning. 1...Body frame, 1P...Bracket, 2
...Light source lamp, 3...Slit, 4, 5, 6,
8... Mirror, 7... Projection lens, 9... Photoreceptor, 10... Scanning drive motor, 11, 13, 14a
, 15, 16a, 18, 21, 22a, 23...
Pulley, 12, 14, 22, 25, 26, 47...
...Pulley, 17, 17a, 48, 177...Hook, 40...Lens moving table, 42...Rack, 4
3... Slide cam, 44... Support shaft, 45... Follower member, 46... Follower roller, 47,1
78,179...Pulley, 58...Stepping motor, 70...Moving pulley base, 85...Cam, 8
6...Cam follower, 170,190...variable power plate, 171,191...base plate, 17
1A, 171D...Wall, 171B...Guide wall,
171C, 191K...Auxiliary plate, 171F
, 186...adjustment screw, 171K, 191M...
Clamp screw, 172, 173, 192, 193
...Spring hook, 171N, 174, 174
a, 185A, 194a...Spring, 175
... Guide groove, 176 ... Guide member, 176S
, 191T...Screw, 180...Focus adjustment stand,
183A, 183B...Slide groove, 184A,
184B...Pin, 185...Bracket, 19
1G...Guide hole, 191L...Rotation shaft, 19
1P...Adjustment part, 191U...Screw hole, 191V
...adjustment screw, 191Y... spring, A... first traveling base, B... second traveling base, W ₁ , W ₂ , W ₃ ...
wire.

Claims

[Claims for Utility Model Registration] (1) A first traveling table provided with a lamp and a mirror for scanning the document screen, and a first traveling table that moves in the same direction at half the speed of the first traveling table; In an optical system comprising a second traveling table provided with a mirror for re-reflecting light reflected from the table, and a lens for projecting the document screen onto an image carrier via the mirror, the main body is located at the center in the traveling direction. a guide member provided on the frame; a variable power plate having a guide member provided so as to be guided in the direction by the guide member and biased by a variable power spring in a direction away from the lens; Driving wires on both sides of the frame are provided to run the base and fix each end to the variable magnification plate, a lens moving base that is movable in the direction and equipped with a slide cam, and a driving means for moving the moving base. a follower member that swings with the slide cam; and a variable power wire fixedly fixed at both ends to the variable power plate and the main body frame of the optical system via a pulley provided on the member.
An image forming apparatus capable of converting magnification, comprising: a variable magnification/focus adjustment mechanism that adjusts a position between the lens moving table and the variable magnification plate by changing the path or length of the wire. (2) In the image forming apparatus capable of converting magnification according to claim 1, the variable magnification spring, the follower member, the variable magnification wire, and the variable magnification focus adjustment mechanism are removed, and the same magnification focus adjustment mechanism is provided between the main body frame and the variable magnification plate. 1. A same-magnification type image forming apparatus, comprising: and a variable-magnification plate fixing mechanism. (3) The same-magnification image forming apparatus according to claim 2, wherein the variable magnification plate fixing mechanism is made possible by screwing a headed screw into a screw hole provided in the guide member.