JPH0840621A - Electron photographing device - Google Patents

Abstract

PURPOSE:To provide an electron photographing device at a low cost in which the number of part items do not increase even if a detection mechanism and a paper sheet press mechanism are provided. CONSTITUTION:A press member 27 for pressing discharged record paper sheets 13 is provided in a paper discharge part 12 and the press member 27 is provided on the shaft part 23a of a detection member 23 integrally. As the detection member 23 and the press member 27 are in one body, the number of part items is lessened and the cost of the device is low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus such as a printer, a copying machine and a facsimile.

[0002]

2. Description of the Related Art In the above electrophotographic apparatus, most of the apparatuses are provided with a detection mechanism in order to obtain a control signal for jam detection or the like. This type of detection mechanism detects that a transfer target has passed by, for example, when the transfer target such as paper rotates the filler, the operating unit that moves integrally with this filler blocks the transmissive or reflective sensor. are doing. For example,
In Japanese Utility Model Laid-Open No. 62-200648, the actuator 21 is rotated by a sheet, and a sensor detects this.

Further, there is also known a conventional electrophotographic apparatus provided with a pressing member for aligning the transferred materials discharged to the paper discharge tray. For example, JP-A-63-
In Japanese Patent Laid-Open No. 101266, sheets are aligned by pressing the transfer target discharged onto the discharge tray with a sheet presser 58.

Further, in the conventional electrophotographic apparatus, there is known an apparatus provided with a detection mechanism and a paper pressing mechanism. In such an apparatus, the detection mechanism and the paper pressing mechanism are provided separately. .

[0005]

However, even in the electrophotographic apparatus provided with the detection mechanism and the paper pressing mechanism, since both mechanisms are separate, the number of parts is increased and the number of assembling steps is increased, resulting in high cost. There was a problem.

The present invention solves the above-mentioned conventional problems,
The object of the present invention is to provide an inexpensive electrophotographic apparatus without increasing the number of parts even if the detection mechanism and the paper pressing mechanism are provided.

[0007]

In order to achieve this object, the present invention provides a detection for detecting the presence / absence of the transfer target by rotating the detection member of the transfer target discharged to the discharge section. An electrophotographic apparatus having a mechanism is characterized in that a pressing member for pressing the discharged transfer material is provided in the paper discharging unit, and the pressing member and the detection member are integrally formed.

[0008]

According to the above construction, since the pressing member for pressing the discharged transferred material is provided in the paper discharging section and the pressing member and the detecting member are integrally formed, the pressing member and the detecting member are combined. Since it is one component, it can be provided with a simple structure and at a low cost.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a laser printer as an electrophotographic apparatus according to the present invention.

In FIG. 1, reference numeral 1 is a laser optical unit for projecting a laser beam based on an image signal, 2
Is an image forming unit. In this laser printer, when a recording paper 13 as a transfer medium is fed from a paper feeding device 7 in a direction of an arrow A, a latent image bearing composed of a belt-shaped photoconductor 3 is timed by a registration roller pair 8. Transported to the body. The photoconductor belt 3 is rotationally driven in the counterclockwise direction, the surface of the photoconductor belt 3 is charged by the charging charger 4, and the laser beam 5 from the laser optical unit 1 is emitted to form an electrostatic latent image on the photoconductor 3. This latent image
When passing through the developing device 6, a visible image is formed by the toner, and this visible image is transferred to the recording paper 13 conveyed to the photoconductor 3 by the transfer charger 9, and the recording paper 13 in close contact with the photoconductor 3 is separated by curvature. R. After that, the recording paper 13 is conveyed from the image forming unit 2 to the fixing device 10, and when the unfixed toner image carried on the recording paper 13 is fixed, the recording paper 13 is ejected to the paper ejection unit 12. On the other hand, the residual toner on the photoconductor 3 after the transfer of the visible image is removed by the cleaning device 11.

As shown in FIGS. 1 and 2, the paper ejecting section 12 is provided with a paper ejecting roller 21 and a paper ejecting tray 22 for stocking the ejected recording paper 13, and the paper ejecting section further has a paper ejecting tray 22. A detection mechanism for detecting the presence or absence of the recording paper 13 is provided. The detection mechanism of the present embodiment has a support member 15 fixed to the unit side plate 14 of the fixing device 10 and a detection member 23 in which a shaft portion 23a is rotatably mounted.
As shown in FIG. 4, in FIG. 3, a filler portion 24 in contact with the discharged recording paper 13 and a blocking portion 26 capable of advancing and retracting between the light emitting portion and the light receiving portion of the photo interrupter 25 are integrated via a shaft portion 23a. Is provided for the purpose. In this case, the filler part 2
4 is arranged on the right side of the paper discharge roller 21 in the drawing.

Further, the discharged recording paper 1 is output to the paper output unit 12.
A pressing member 27 for pressing the sheet 3 is provided.
It extends to the 2nd side. The pressing member 27 is integrally provided on the shaft portion 23a of the detection member 23 according to the present invention, and is operated together with the filler portion 24 and the like of the detection member 23.

The laser printer having the above-mentioned structure is provided with the recording paper 13
When the front end of the sheet reaches the paper discharge section 12, as shown in FIG. 2, the filler section 24 of the detection member 23 rotates clockwise in the figure,
The blocking unit 26 formed integrally with this separates from the light emitting unit / light receiving unit of the photo interrupter 25 and allows the light of the light emitting unit to enter the light receiving unit. Through this series of operations, it is detected that the recording paper 13 is passing through the paper discharge unit 12. Further, when the filler portion 24 is rotated, the pressing member 27 is also rotated clockwise through the shaft portion 23a to open the discharge port.

When the trailing edge of the recording paper 13 passes through the paper discharge section 12, the filler section 24 rotates counterclockwise by its own weight as shown in FIG. 3, and the blocking section 26 causes the light emitting section of the photo interrupter 25. The light receiving portions are cut off to detect that the recording paper 13 is discharged to the paper discharge tray 21. Further, the pressing member 27 also rotates counterclockwise to stack the discharged recording paper 13 at the regular position. That is, the pressing member 2
7, the trailing edge of the recording paper 13 as shown in FIG.
Therefore, it is possible to surely prevent the problem that the item 1 stops.

Thus, the detection member 23 and the pressing member 27
Since they are integrated, the number of parts is small and the cost is low. Moreover, a mechanism for moving the holding member 27 by using the movement of the detection member 23 to operate the holding member 27 at the position where the discharge port is opened and the position where the recording paper is held is not necessary.

The pressing member 27 may be configured such that a mylar (trade name) is attached to the front end side and the recording paper 13 is slightly pressed against the paper discharge tray 21. Further, the detection mechanism may be one that detects with an appropriate switch of the detection member 23, or may be one that is directly operated by the filler portion without providing a blocking portion.

[0017]

According to the first aspect of the present invention, since the pressing member for pressing the discharged transfer material is provided in the paper discharging portion, and the pressing member and the detecting member are integrally formed, the pressing member is formed. The detector and the detection member are integrated into one component, and the structure is simple and can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a laser printer as an electrophotographic apparatus according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing a state of a paper discharge section during which the recording paper of the present invention is passing.

FIG. 3 is a cross-sectional explanatory view showing a state of a paper discharge unit immediately after a recording paper of the present invention has passed.

FIG. 4 is a perspective view of a detection mechanism of the present invention.

FIG. 5 is a cross-sectional explanatory view showing a defect when there is no pressing member.

[Explanation of symbols]

 2 Image Forming Section 12 Paper Ejection Section 13 Recording Paper 22 Paper Ejection Tray 23 Detection Member 24 Filler Section 25 Photointerrupter 26 Blocking Section 27 Pressing Member

Claims (1)

[Claims] 1. An electrophotographic apparatus having a detection mechanism for detecting the presence / absence of a transfer target by rotating the detection member by the transfer target discharged to the paper discharge unit. An electrophotographic apparatus, wherein a pressing member for pressing the transferred object is provided, and the pressing member and the detection member are integrally formed.