JP2892573B2 - Jam paper removal mechanism of recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for removing paper jammed in a paper transport path in a recording apparatus such as an electrophotographic printing apparatus.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view showing a sheet discharging section of a conventional electrophotographic printing apparatus. FIG. 5 shows a sheet conveyance path from fixing of the toner image to discharge in the electrophotographic printing apparatus. In FIG. 5, a fixing device 1 for fixing a toner image on a sheet is covered by an upper cover 2 and a lower cover 3,
A fixing roller 4 and a pressure roller 5 are provided inside. The left side 2a and 3a of the upper cover 2 and the lower cover 3 form a paper guide. Transport rollers 6 and 7 are rotatably disposed on the left side of the fixing device 1, and discharge rollers 8 and 9 are disposed above the transport rollers 6 and 7.

A discharge sheet guide 10 for guiding a sheet is provided between the conveying rollers 6 and 7 and the discharge rollers 8 and 9. A sheet separator 11 is arranged along the discharge sheet guide 10 so as to be rotatable about a fulcrum 11a. The sheet separator 11 discharges the sheet,
When the paper is transported in nine directions, it is at the position shown by the solid line, and when the paper is transported in the direction of arrow A, it rotates to the position shown by the dotted line.

A stacker cover 12 is provided on the right side of the discharge rollers 8 and 9 so as to be rotatable about a fulcrum 12a, and a bottom portion thereof forms a sheet stacking section 13 for stacking discharged sheets.

Next, the operation will be described. When the paper P to which the toner image has been transferred by the image forming unit (not shown) is conveyed to the fixing device 1, the paper P is pressed and held by the fixing roller 4 and the pressure roller 5 of the fixing device 1, and the toner image is heated by the heat of the fixing roller 4. Is fixed, and the guide portion 2 is
a and 3a are further conveyed to conveying rollers 6 and 7. The sheet P on which the fixing has been completed is conveyed toward the guide section 10 by the conveying rollers 6 and 7, and further discharged to the sheet stacking section 13 by the discharge rollers 8 and 9.

When the sheet P is conveyed in the direction of arrow A, before the sheet P passes through the fixing device 1, the sheet separator 11
Is rotated to the position indicated by the dotted line, and is conveyed in the same direction by the conveyance rollers 6 and 7.

[0007]

However, in the above-mentioned conventional paper transport path, when the paper P is discharged to the paper stacking section 13, the sheet separator 11 for switching the transport direction of the paper P may cause some malfunctions as shown in FIG. When the paper P is stopped at the position shown by the dashed line shown in FIG. 2, the leading edge of the paper P hits the sheet separator 11, and when the paper P is further conveyed in this state, the paper P is moved between the guide portion 2 a of the upper cover 2 and the lower cover 3. A jam occurs between the guide portions 3a.

Conventionally, when the paper P is jammed, the stacker cover 12 is opened to remove the jammed paper. However, there has been a problem that the guide portion 2a of the upper cover 2 is in the way and it is difficult to remove the jammed paper.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a jam paper removing mechanism which is excellent in operability and can easily remove a jammed paper during transportation.

[0010]

According to the present invention, there is provided a guide member rotatably provided for guiding a sheet along a sheet conveying path, and separating the guide member from the sheet conveying path. A biasing member for biasing the guide member in the direction of rotation of the guide member, and rotatably disposed above the guide member, and rotating the guide member in the other direction by rotating in one direction to hold the paper guide position. And a holding member for allowing the guide member to rotate in one direction by rotation in the other direction and releasing the holding state at the sheet guide position.

The holding member may be constituted by an openable / closable device cover, and the guide member may be held at the paper guide position by rotating in the closing direction, and the holding state of the guide member may be released by rotating in the opening direction. Good.

[0012]

According to the present invention having the above structure, when the paper jam occurs in the paper transport path, the holding member is released from the paper guide position by rotating the holding member in the other direction. As a result, the guide member rotates in a direction away from the paper transport path. As a result, the jammed paper is exposed and is easily removed.

When the holding member is constituted by a device cover that can be opened and closed, when a paper jam occurs, the holding state of the guide member at the paper guide position is released by opening the device cover. The guide member rotates in a direction away from the sheet conveying path by the urging member. Therefore, in this case, the operation of removing the jammed paper is further facilitated.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below in detail with reference to the drawings. Elements common to the drawings are assigned the same reference numerals. FIG. 1 is an explanatory view showing a jam sheet removing mechanism according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a sheet guide section according to the embodiment.

In both figures, the upper cover 2 of the fixing device 1
A mounting portion 21 is formed in the mounting portion 21, and a sheet guide portion 22 is rotatably mounted on the mounting portion 21. A post 23 is provided on a side portion 22 a of the sheet guide portion 22, and the post 23 is rotatably inserted into a hole 24 formed in the mounting portion 21. A torsion spring 25 is attached to the post 23, and one end of the spring 25 is engaged with the upper cover 2, and the other end is engaged with a stopper 26 formed on the side 22 a of the seat guide 22. The spring 25 urges the sheet guide portion 22 in the direction of arrow B shown in FIG. Also, the sheet guide section 2
Numeral 2 prevents rotation in the counterclockwise direction from the position shown in FIG. 1 by means not shown. The lower surface 22b of the sheet guide portion 22 forms a guide for guiding the sheet P.

A sheet stacking section 13 is formed on the stacker cover 12 as in the conventional example, and a rib 27 is formed below the stacker cover 12. The rib 27 is in a state where the stacker cover 12 is closed (the state shown in FIG. 1).
The sheet guide section 22 is engaged with the sheet guide section 22 to hold the sheet guide section 22 in a horizontal state, that is, in a state where the sheet guide section 22 can guide the sheet P. The other structure is the same as that of the conventional example, and the description is omitted.

Next, the operation of this embodiment will be described. Note that the normal sheet transport operation is the same as the conventional one, and thus the description thereof is omitted, and the operation of removing the jammed sheet will be described in detail here. When the sheet P is transported, the sheet guide unit 2
Reference numeral 2 denotes a horizontal state as shown in FIG. 1 so that the sheet P can be guided.

When a jam of the sheet P occurs due to a poor rotation operation of the sheet separator 11, most of the jammed sheet P stops below the sheet guide portion 22.
In this state, the stacker cover 12 is rotated counterclockwise about the fulcrum 12a. Thereby, the rib 27 releases the holding state of the sheet guide portion 22, and the sheet guide portion 22 rotates in the direction of arrow B shown in FIG. This state is shown in FIG. FIG. 3 is a cutaway side view showing the open state of the stacker cover 12. The clockwise rotation of the sheet guide portion 22 stops in a substantially vertical state by abutting against a limiter (not shown) of the upper cover 2.

FIG. 4 is a perspective view showing an apparatus to which the embodiment is applied, and shows a state in which the stacker cover is opened similarly to FIG. As shown in FIG. 4, when the stacker cover 12 is opened to some extent, the upper cover 2 and the stacker cover 1 are opened.
The jammed paper P can be visually observed between the stacker 2 and the paper P. Therefore, when removing the jammed paper P, a hand can be inserted from above the stacker cover 12 and the paper P can be easily extracted.

[0020]

As described above in detail, according to the present invention, a guide member rotatably provided to guide a sheet along a sheet conveying path, and the guide member is moved in a direction away from the sheet conveying path. An urging member that urges the guide member in a rotational direction, and is disposed rotatably above the guide member;
A holding member for rotating the guide member in the other direction by rotating in one direction and holding the guide member in the paper guide position, and rotating the guide member in one direction by rotation in the other direction to release the holding state at the paper guide position; Is provided, the jammed paper can be easily extracted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a jammed paper removing mechanism according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a sheet guide section of the embodiment.

FIG. 3 is a cutaway side view showing an open state of a stacker cover in the embodiment.

FIG. 4 is a perspective view showing an apparatus to which the embodiment is applied.

FIG. 5 is an explanatory diagram showing a conventional paper transport path.

[Explanation of symbols]

 2 Upper Cover 12 Stacker Cover 22 Sheet Guide 25 Torsion Spring 27 Rib P Paper

──────────────────────────────────────────────────続 き Continuing the front page (72) Inventor Jun Kobayashi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-2-138807 (JP, A) (58) 6) Surveyed field (Int.Cl. ⁶ , DB name) B65H 7/06 B41J 13/10 B65H 5/06 B65H 5/36 G03G 15/00 526

Claims (2)

(57) [Claims] 1. A guide member rotatably disposed to guide a sheet along a sheet conveying path, and an urging member for urging the guide member in a direction away from the sheet conveying path in a rotation direction of the guide member. And rotatably disposed above the guide member, rotating the guide member in the other direction by rotation in one direction to hold the paper guide position, and rotating the guide member in one direction by rotation in the other direction. And a holding member for releasing the holding state at the sheet guide position by providing the jammed sheet removing mechanism of the recording apparatus. 2. The holding member according to claim 1, wherein the holding member is a cover which can be opened and closed, holds the guide member at a paper guide position by rotating in a closing direction, and releases the holding state of the guide member by rotating in an opening direction. Jam paper removal mechanism of the recording device.