JP2003137461A - Manual feeding mechanism of paper feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve the trouble of removing a cursor, which is attached on the top of a manual feed assembly as a paper width guide with a magnet so that it can be detached to prevent it from coming into contact with an attaching/detaching unit when this attaching/detaching unit is pulled out upon jam clear or replacement of a photosensitive drum, whenever the attaching/detaching unit is pulled out from an image forming device which has the attaching/ detaching unit, which is pulled out in the direction parallel to the paper feed direction of the manual feed assembly, with a document table, a transfer separation unit, a fixing unit, and a paper feed unit incorporated at the top of a manual feed assembly. SOLUTION: The cursor as a paper width guide of the manual feed assembly is attached to the attaching/detaching unit so that it will move when the unit is pulled out, and consequently there will be no need to detach it and it will not contact the unit and come off when it fails to be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printer, and a facsimile, and more particularly to a manual paper feeding unit of an image forming apparatus capable of forming an image on a large size sheet such as A0 size. Regarding mounting of a cursor that regulates the paper width.

[0002]

2. Description of the Related Art In a machine for forming an image on a large size paper such as A1 and A0, a roll paper is used as the paper because of its easiness of handling, and a paper feed unit including a plurality of roll papers is configured. On the other hand, a manual paper feed unit is also provided so that cut sheets of any size can be used, and this manual paper feed unit can move paper horizontally in order to accurately align the paper transport position. A cursor that limits the width is attached.

On the other hand, a business-class image forming apparatus capable of forming an image up to A3 size paper generally conveys and discharges the paper in the left and right direction of the machine, and when the paper is jammed, the photosensitive drum, the developing device, or the like is used. Although the image forming unit is configured to be pulled out toward the front side of the machine, a wide-width machine that forms an image on a large size sheet such as A1 or A0 has a length of about 1 m when the photosensitive drum or the developing unit of the image forming unit is used. In addition, since it is difficult to pull out the image forming unit to the front side of the machine, the sheet is conveyed in the front-rear direction of the machine. Therefore, if there is a paper jam in the image forming unit or the need to replace the photosensitive drum,
Remove the jammed paper or replace the photoconductor drum from the space created by pulling out the attachment / detachment unit that integrally includes the document table, paper ejection unit, transfer separation unit, and fixing unit to the front side of the machine. There is.

Conventionally, in the paper jam processing and the replacement of the photosensitive drum, when the detachable portion is pulled out in the front direction of the machine (moved in the right arrow direction in the drawing) as shown in FIG. Since the attached cursor 17 collides with the attachment / detachment section 15 and interferes with the attachment / detachment section 15, it is attached to the upper surface 16a of the manual sheet feeding section by a magnet or the like so as to be removable.

[0005]

However, at the time of paper jam processing and replacement of the photoconductor drum, the cursor of the manual paper feeding unit is always moved as described above when the detachable unit is pulled out to the front of the machine for processing. It is troublesome to remove it from the top surface of the part, and if you forget to remove it, there is a problem that the detachable part collides with the cursor and falls down.

[0006]

In order to solve the above-mentioned problems, according to the invention of claim 1, an attachable / detachable portion that can be pulled out in parallel with a sheet conveying direction of the manual sheet feeding section is provided on an upper portion of the manual sheet feeding section. In the image forming apparatus, the manual paper feed mechanism of the paper feed device is characterized in that the paper width regulation cursor of the manual paper feed unit is attached to the removable unit, and the removable unit is used at the time of paper jam or replacement of the photosensitive drum. When pulling out the paper toward the front of the machine, the paper width regulation cursor of the manual paper feed section moves in conjunction with the attachment / detachment section, so if the cursor collides with the attachment / detachment section and the cursor falls, it can be prevented. There is no need to remove the cursor each time beforehand. Further, according to the invention of claim 2, the sheet width regulating cursor of the manual sheet feeding section is attached to the attaching / detaching section by a magnet, and the manual sheet feeding mechanism of the sheet feeding apparatus according to claim 1. Since it is attached by a magnet, the cursor can be easily moved or removed when the paper width changes.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 and 2 are a perspective view and a schematic sectional view showing the configuration of the entire copying machine according to an embodiment of the present invention. The internal structure of the machine will be described with reference to FIG. Copier 1
A roll paper accommodating portion 2 for accommodating a plurality of roll papers is located at a lower portion, and a transport mechanism 3 for feeding the papers upward to the image forming portion, a document table 4 for transporting a document, a document An optical system 6 for reading a document conveyed to the document reading position 5 by the table 4, an image forming mechanism 7 for forming an image based on light provided from the optical system 6 and transferring the image onto a sheet, and A fixing device 8 for fixing the image transferred on the sheet is provided. The image forming mechanism 7 includes a main charger 9 that uniformly charges the photoconductor drum, a photoconductor drum 10 that forms a latent image after main charging, a developing device 11 that supplies toner to the photoconductor drum 10, and a toner on paper. A cleaning device 12 for collecting untransferred toner after transferring an image is provided. The paper feeding unit 2 is divided into, for example, three stages in the vertical direction, and the lower two paper feeding units 2 are provided.
The roll papers a and 2b each having a paper width different from each other, such as A0, A1, and A2 sizes, are wound in a tubular shape, and the uppermost sheet feeding unit 2c is smaller than the roll paper or the A2 size. Cut sheets larger than A4 size can be selectively accommodated. Further, when using roll paper, a cutter is provided to obtain an appropriate image length. The transport mechanism 3 extends straight in the vertical direction,
The sheet sent out from the sheet feeding unit 2 is bent toward the front side in the vicinity of the most downstream side, is sent out to the image forming mechanism 7 substantially horizontally, and image formation is performed as described above, and the toner on the sheet is fixed at the fixing unit 8. After fixing the image, the paper is ejected from the paper ejection unit 14.

3 and 4 show a document table 4 and a transfer separation unit 1 when a paper jam occurs in the image forming unit or when the drum is replaced.
3 is a perspective view and a schematic cross-sectional view showing a state in which an attaching / detaching portion 15 including a fixing portion 8, a fixing portion 8 and a paper discharging portion 14 is pulled out to the front side of the machine and an image forming portion is opened. The manual sheet feeding unit 16 according to the present invention will be described with reference to FIG. The manual paper feed unit 16 is located above the paper feed unit 2, and moves in the horizontal direction with the cursor 17 to regulate the paper width. Since the attachment / detachment section 15 is provided on the front side of the machine so as to be drawn out immediately above the manual sheet feed section 16, by attaching the cursor 17 of the manual sheet feed section 16 to the detachable section 15, Since it becomes possible to interlock with the attaching / detaching portion 15, and the cursor 17 and the attaching / detaching portion 15 do not collide with each other when the attaching / detaching portion 15 is pulled out, there is no need to remove it in advance.

The cursor 17 of the manual paper feed section 16 of the present invention
6 and 7 are sectional views showing a state in which the cursor 17 is attached to the attaching / detaching portion 15 according to one embodiment. As shown in FIG. 6, the cursor 17 of the manual paper feeding unit is composed of a mounting portion 17a on the upper surface provided with a magnet 17b and a width regulating portion 17c. Top attachment part 1 of the manual paper feed unit 17
Reference numeral 7a denotes a tip portion of the attaching / detaching portion 15 along the inclination of the attaching / detaching portion
The bottom surface 15a of the attaching / detaching portion 15 is made of a flat surface attached to the bottom surface 15a of the magnet 5 by the magnet 17b as shown in FIG.
It can be attached to the and can be interlocked with the movement of the attaching / detaching portion 15. The shape of the cursor 17 of the manual paper feeding unit of the present invention may be, for example, a rack and pinion configuration as long as it can be attached to the attachment / detachment unit 15, and is not limited to the shape of FIG. 6.

[0010]

According to the present invention, an attachment / detachment section including a document table, a transfer / separation section, a fixing section, a sheet ejection section, etc. is provided directly above the manual feed section, and this attachment / detachment section is provided on the front side of the machine. In the image forming apparatus configured to be pulled out, by attaching a cursor for regulating the paper width of the manual paper feeding unit to the detachable unit, the cursor collides with the detachable unit when the detachable unit is pulled out and the cursor falls. It is no longer necessary to remove the cursor beforehand so that it will not hit or hit.

[Brief description of drawings]

FIG. 1 is an external perspective view of a wide-width copier adopting the present invention.

FIG. 2 is a schematic sectional view of a wide-width copier adopting the present invention.

FIG. 3 is an external perspective view of a wide-width copier adopting the present invention in a state where an attaching / detaching portion is pulled out.

FIG. 4 is a schematic cross-sectional view of a wide-width copier adopting the present invention with an attaching / detaching portion pulled out.

FIG. 5 is a cross-sectional view showing a cursor section of a manual sheet feeding section in a conventional example of a wide-width copier adopting the present invention.

FIG. 6 is a perspective view of a cursor of the manual paper feeding unit of the present invention.

FIG. 7 is a cross-sectional view showing a cursor portion of a manual paper feeding unit in the present application of the wide-width copier adopting the present invention.

[Explanation of symbols]

15: Detachable part 16: Manual feed unit 17: Cursor of manual paper feed section 17a; upper surface mounting portion of cursor of manual paper feeding unit 17b; magnet part of cursor of manual paper feed unit 17c; Width regulation section of cursor of manual feed section

Claims (2)

[Claims] 1. In an image forming apparatus having an attachable / detachable section that is capable of being drawn out in parallel with a sheet conveying direction of the manual feed section, in the image forming apparatus, the sheet width regulation cursor of the manual feed section is the detachable section. A manual sheet feeding mechanism for a sheet feeding device, which is characterized in that it is attached to a sheet feeding device. 2. The manual paper feeding mechanism of the paper feeding device according to claim 1, wherein the paper width regulation cursor of the manual paper feeding portion is attached to the attaching / detaching portion by a magnet.