JPH0456968A - Electrostatic recording type vertical printer - Google Patents

Abstract

PURPOSE:To eliminate a stain on a machine due to the attachment of unfixed toner and to perform appropriate jam processing by providing a pair of gate rollers at a cover, and abutting a cleaning pad to absorb toner with a roller at least at a recording plane side comprising the pair of gate rollers. CONSTITUTION:The pair of gate rollers 20 are provided at the cover 15, and also, the cleaning pad which adsorbs the toner is abutted with the roller 23 at least at the recording plane side comprising the pair of rollers 20. When the cover 15 is opened in the jam processing, a recording sheet at a part staying in a recording paper supply means is drawn out as moving the pair of gate rollers 20 with the cover 15. When the recording sheet is extracted from the rear end in such state, the recording sheet can be taken out outside a device without bringing the sheet into contact with another part accidentally by guiding with the pair of rollers 20. Thereby, even when the gate roller 23 comes in contact with the unfixed toner of the recording sheet and is contaminated, the recording sheet can be prevented stained in the next print, and the appropriate jam processing can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image forming apparatus that uses an electrostatic recording method, and more specifically, to an image forming apparatus that eliminates the electrostatic recording method, and more specifically, an apparatus that facilitates the disposal of paper jams generated between a registration roller and a photoreceptor drum. The present invention relates to an electrostatic recording type image forming apparatus that can perform electrostatic recording.

(Prior Art) Electrostatic recording type image forming apparatuses using dry toner are equipped with members that are open to electrostatic recording writing, such as gate rollers, transfer units, and fixing units, on the paper feed path. These members restrict the movement of the recording paper, making it easy for paper jams to occur.

In order to deal with such paper jams, for example,
As seen in Japanese Patent No. 1-116363, an apparatus having a so-called crocodile-type housing structure has been proposed, in which the apparatus can be divided into upper and lower halves with a nearly horizontal sheet feeding path as a boundary.

(Problem to be Solved by the Invention) According to such a device, vapor jams occurring on the open side can be treated in M single steps, but vapor jams occurring between the gate roller and the fixing device can be treated in one step. It remains difficult to treat.

In other words, when a vapor jam occurs between the gate roller and the fixing device, the recording paper is wavy between the gate roller and the fixing device, so grasp the left and right edges of the jammed paper near the center, and remove the leading edge of the paper. Unless the toner is pulled out from the fixing drawing and the trailing edge of the recording paper is pulled out from the gate roller at the same time, the inside of the blinker will be contaminated with unfixed toner, making jam removal troublesome.

The present invention has been made in view of these problems, and its purpose is to allow the trailing edge of the paper to be in an open TJi state when the lid is opened, and to allow the paper to be read as it is. To provide a new electrostatic recording type vertical printer that eliminates internal contamination due to unfixed toner adhesion even when pulled out, and enables appropriate jam disposal.

(Means for Solving the Problems) In order to solve such problems, in the present invention, a housing is constituted by a main body and a lid body which is pivotally supported at the lower end of the main body and is provided so as to be openable and closable. The dividing surface between the main body and the lid is used as a printing path, and the main body side is equipped with a photosensitive drum, the lid is equipped with a transfer means, and the upper part of the main body is equipped with a recording paper supply means. A pair of gate rollers is provided on the lid body, and a cleaning band Wi for adsorbing toner is applied to at least the roller on the recording surface side constituting the pair of gate rollers.

(Function) By opening the lid when clearing a jam, the gate roller moves together with the lid and pulls out the part of the recording paper that is stuck in the recording paper supply means. When the recording paper is pulled out from the recording paper, it can be guided by a pair of gate rollers and taken out of the printing area without unnecessarily touching other parts.

During this pulling process, one of the gate rollers that makes up the gate roller pair comes into contact with unfixed toner adhering to the recording paper and becomes contaminated, but this is wiped away by the cleaning pad, so the next time printing This will not stain the recording paper.

(Example) The details of the present invention will be described below based on illustrated examples.

FIG. 1 shows an embodiment in which the present invention is applied to an electrostatic recording type vertical printer. In the figure, reference numeral 1 is the printer main body, and on the top thereof there are two paper feed cassettes. 2.3 are removably attached, and these cassette mounting parts 1
A paper feed roller 5.6 is provided for feeding the recording paper in each cassette 2.3 to the paper transport path 4.

7/(photosensitive drum 8, developing device N9, charging device 10
, an erase device M11, and a cleaning device 12 are integrated into the photosensitive unit, and is removably provided in the main body 1 so as to receive an optical dome from an optical signal generator M13.

Reference numeral 15 denotes a lid that covers the front surface of the printer main body with the paper conveyance path 4 as its boundary, and is attached to the main body 1 by a support shaft 17 at the lower end of the front surface so as to be openable and closable. A transfer device 118 is provided on the lid body 15, facing the photosensitive drum 8 with the paper conveyance path 4 in between.
However, below the photosensitive drum 8, a fixing device 'a19 is provided.

Reference numeral 20 denotes a pair of gate rollers, which is a feature of the present invention, and is provided on the lid 15 so as to be located upstream of the photoreceptor drum 8.

FIG. 3 shows the details of the pair of gate rollers described above, and the gate roller 21 in the figure is made of a material such as rubber that has a high coefficient of friction against the recording paper. When the lid 15 is closed, it is connected to the drive source (not shown) of the main body 1 via a roller gear 22 provided at one end, and when the lid 15 is opened, it is connected to the drive source. The connection is now disconnected.

A roller 23 is in contact with the recording surface side of the recording paper, and is made of a material rich in moisture such as fluororesin or hard polyethylene, and is constantly connected to the gate row 521 by a spring 25.25 via a support shaft 24. being oppressed.

A cleaning pad 26 has a length in the axial direction that covers the recording paper conveying area of the gate 0-ra 23 on the recording surface side, and is made of a material such as felt that can easily hold fine powder in its pores. The gate roller 23 is positioned so as to be compressed by the cover 27.

In this embodiment, when the lid 15 is closed as shown in FIG. The recording paper is now ready to be transported.

When a print command is output in this state, the paper feed cassette 2.
The recording paper No. 3 is fed into the paper conveyance path 4 to the gate roller 20 by the paper feed roller 5.6. The roller 21 of the gate roller 20 rotates in response to power from the main body side, and feeds the recording paper to the photoreceptor drum 8 in cooperation with the roller 22 . The recording paper sent out from the gate roller 20 moves to the photoreceptor drum 8, the toner image formed on the photoreceptor drum 8 is transferred, and the recording paper moves to the fixing device [19].

On the other hand, even if a vapor jam occurs with the leading edge of the recording paper P caught in the fixing device 118 and the trailing edge stuck in the paper feed cassette 2.3 as shown in FIG. , when the lid 15 is opened, the lid 15 is attached to the support shaft 171F!
: Rotates as a fulcrum, grips the recording paper with the gate roller 22, and pulls it out from the paper feed cassette 2.3 while moving along the print path 4v! Open it (Figure 5).

In this state, if you grab the rear end of the recording paper and pull it out, the portion of the recording paper that exists from the photoreceptor drum 8 to the fixing device M18 will be transferred to the roller 23 with the unfixed portion and the roller 21 with the non-printing portion. Because it is held in place, it can be pulled out without touching any unfixed toner areas during movement.

During this process of drawing out the recording paper, the printing surface of the recording paper
While contacting the roller 23 and rotating it, some of the toner that has been attached only by electrostatic force will be attached to the roller 23, but the toner attached to the row 523 will be removed by the rotation of the roller 21, which has already been cleaned. is absorbed by the hand 26 and wiped off by the roller 23.

When the vapor jam processing is completed and printing is started again, the gate roller pair 20 feeds the recording paper pulled out from the paper cassette 2.3 to the photoreceptor drum 8. In this process,
The roller 23 comes into contact with the printing surface of the recording paper after coming into contact with the cleaning pad 26, but since the cleaning pad 26 strongly retains the toner that has been absorbed, recontamination by the roller 23 occurs. It doesn't matter.

In this example, the roller that comes into contact with the printing surface is made of a material rich in moisture, but it is clear that the same effect can be achieved even if the roller is made of rubber material. By contacting not only the O-roller that contacts the printing surface but also the roller on the non-printing surface side, a certain ringing effect can be obtained, and recording paper feeding failure of the gate roller can be prevented.

Roughly speaking, in this embodiment, the cleaned end is kept in contact with the roller at all times, but when the lid is closed, the cleaning member is pulled away from the roller by the suppressing member of the main body. , contamination by cleaned toner can be reliably prevented.

(Effects) As described above, according to the present invention, a bacterial cell is constituted by a main body and a lid which is pivotally supported at the lower end of the main body and is provided so as to be openable and closable, and a dividing surface between the main body and the lid is printed. A photosensitive drum is provided on the main body side as a path, and a transfer means is provided on the lid body.
In addition, in the case where the upper part of the main body is equipped with a recording paper supply means, a pair of gate rollers is provided on the lid, and a cleaning pad for adsorbing toner is brought into contact with at least the roller on the recording surface side constituting the pair of gate rollers. Therefore, by opening the lid when clearing a jam, the gate roller moves with the lid to pull out the part of the recording paper that is stuck inside the recording paper supply means, and in this state, the recording paper can be pulled out from the rear end. This allows the recording paper to be guided by the pair of gate rollers and taken out of the cassette without unnecessarily touching other parts. Even if it comes into contact with unfixed toner on the recording paper and becomes contaminated,
It is possible to prevent the recording paper from being smeared during the next printing by being wiped away by the cleaning pad.

[Brief explanation of the drawing]

1 and 2 respectively show the configuration of a printer that is an embodiment of the present invention. FIG. 1 shows the state with the lid closed, and FIG. 2 shows the state with the lid open. Figure 3 (
(a) and (b) are longitudinal and transverse cross-sectional views showing one embodiment of a pair of gate rollers in the above drawing, and FIGS. 4 and 5 are views showing paper jam processing in the drawing of the present invention. 1...Printer body 2.3...Paper feed cassette 4...Paper transport path 5.6...Paper feed roller 8...Electrostatic drum 9...Development unit ]5... Lid body 17... Support shaft 19...
...Fuser unit 2o...Gate roller 26.
... Cleaning pad applicant Seiko Even Co., Ltd. agent Patent attorney Katsuhiko Kimura Nishiyo Kaji Figure 3 (a) (b)

Claims (1)

[Claims] A housing is constituted by a main body and a lid which is pivotally supported at the lower end of the main body and can be opened and closed, and a photosensitive drum is placed on the main body side with the dividing surface between the main body and the lid as a printing path, and the lid is attached to the main body. and a recording paper supply means on the upper part of the main body, and a pair of gate rollers is provided on the lid, and a cleaning device that attracts toner to at least a roller on the recording surface side constituting the pair of gate rollers. An electrostatic recording vertical printer that uses pads in contact with each other.