JPH0248956U

JPH0248956U -

Info

Publication number: JPH0248956U
Application number: JP12709688U
Authority: JP
Priority date: 1988-09-30
Filing date: 1988-09-30
Publication date: 1990-04-05

Description

[Brief explanation of the drawing]

第１図は本考案が適用されるレーザプリンタの
一例の全体構成を示す断面図、第２図はその装置
に本考案を適用した実施例の上ユニツトを開いた
状態を示す断面図、第３図はその交換部品交換時
の動作を説明する説明図、第４図ａ，ｂはその実
施例のレジストローラ対の構成を示す斜視図及び
分解斜視図、第５図は、その実施例のジヤム紙の
引出し状態を示す断面図、第６図乃至第８図は夫
夫本考案の他の実施例の上ユニツトを閉じた状態
、上ユニツトを開いた状態及び搬送ガイド板の詳
細構造を示す断面図、第９図は、搬送ガイド板の
他の実施態様を示す断面図、第１０図は更に他の
実施例の全体構成を示す断面図、第１１図はその
レジストローラ対及び搬送ガイド板対の構成を示
す分解斜視図、第１２図は従来の上搬送方式のレ
ーザプリンタの例の全体構成を示す断面図、第１
３図はその上ユニツトを開いた状態を示す断面図
である。１……給紙部、２……転写紙、３……レジスト
ローラ対、４……感光体ドラム（像担持体）、７
……現像装置、８……転写チヤージヤ（転写手段
）、９……定着手段、１０ａ……上ユニツト、１
０ｂ……下ユニツト、１３……クリーニングユニ
ツト、１４……トナーカートリツジ・クリーナキ
ツト、２２……上レジストローラ、２３……下レ
ジストローラ、３０……上搬送ガイド板、３１…
…下搬送ガイド板。 FIG. 1 is a cross-sectional view showing the overall configuration of an example of a laser printer to which the present invention is applied, FIG. 4A and 4B are perspective views and exploded perspective views showing the configuration of a pair of registration rollers in this embodiment, and FIG. 5 is an explanatory view for explaining the operation when replacing replacement parts. 6 to 8 are cross-sectional views showing the state in which the paper is drawn out, and FIGS. 6 to 8 are cross-sectional views showing the state in which the upper unit is closed and the upper unit in an open state, and the detailed structure of the conveyance guide plate of other embodiments of the present invention. 9 is a cross-sectional view showing another embodiment of the conveyance guide plate, FIG. 10 is a cross-sectional view showing the overall configuration of still another embodiment, and FIG. 11 is a pair of registration rollers and a pair of conveyance guide plates. FIG. 12 is an exploded perspective view showing the configuration of a conventional top conveyance type laser printer.
FIG. 3 is a sectional view showing the unit in an open state. 1... Paper feeding section, 2... Transfer paper, 3... Registration roller pair, 4... Photosensitive drum (image carrier), 7
...Developing device, 8...Transfer charger (transfer means), 9...Fixing means, 10a...Upper unit, 1
0b...Lower unit, 13...Cleaning unit, 14...Toner cartridge cleaner kit, 22...Upper registration roller, 23...Lower registration roller, 30...Upper conveyance guide plate, 31...
...Lower conveyance guide plate.

Claims

[Claims for Utility Model Registration] (1) Paper is fed from a paper feed section through a pair of registration rollers and a pair of conveyance guide plates between an image carrier and a transfer means disposed opposite to it above the image carrier, and The main body of the apparatus has an upper unit and a lower unit that can be separated from each other by a large distance along the transfer paper transport path after the toner image has been transferred. The image forming apparatus is divided into two parts, and the transfer means is included in the upper unit, wherein the pair of registration rollers and at least one pair of conveyance guide plates are provided on the upper unit side. image forming apparatus. (2) Paper is fed from a paper feed section through a pair of registration rollers between an image carrier and a transfer means disposed opposite to it, and after a toner image is transferred from the image carrier, the paper is conveyed to a fixing means. The apparatus main body is divided into an upper unit and a lower unit which can be separated from each other by a large distance along the transfer paper transport path, and the transfer means is connected to the upper unit. An image forming apparatus including the above-mentioned pair of registration rollers is provided on the upper unit side, and has a mechanism for releasing the pressing force of the pair of upper and lower unit separation time rollers.