JPH06271152A - Feed paper conveying device - Google Patents

Abstract

PURPOSE:To provide a paper sheet conveying mechanism of an image forming device, incapable of feeding paper sheet from a manual insertion paper feeding part while the feed paper/conveyance from a main body paper feeding part are performed. CONSTITUTION:A paper sheet conveying mechanism of an image forming device is provided with a main body paper feeding part for performing the feed paper from a paper feeding cassette and a manual insertion table 1 for performing the namual insertion paper feed by being released, and provided with a handle portion 1b, and a manual insertion paper feeding part wherein the conveyance path is joined with that of a main body paper feeding path 10 is provided. And lock means 2, 3, 4, 5 for preventing the manual insertion table 1 from being released during the operation of the main body paper feeding part are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a copying machine, a facsimile, a printer, etc., and has a main body paper feed portion and a manual paper feed portion, and their conveying paths merge in the middle to form an image. The present invention relates to a sheet conveying mechanism of an image forming apparatus that transfers a transfer sheet to a sheet.

[0002]

2. Description of the Related Art Conventionally, some image forming apparatuses such as copying machines are provided with two paper feeding functions, that is, manual paper feeding for manually feeding paper and automatic paper feeding by a paper feeding cassette. In general, this type of image forming apparatus is provided with a tray for manually feeding paper and a paper feeding cassette separately, and the paper is ejected individually from both. However, from the viewpoint of downsizing of the apparatus or simplification of the transport mechanism, a structure in which paper is separately fed from the manual feed tray and the paper feed cassette is disadvantageous. Further, in the case of such a structure, there is a possibility that trouble may occur when paper is fed from both at the same time, so a separate switch for switching between the manual feed mode and the cassette paper feed mode is required, The configuration is complicated and the operation is troublesome. Therefore, Japanese Patent Laid-Open No. 56-35557 discloses an apparatus in which the same mechanism is used to feed paper from a manual feed tray and paper from a paper feed cassette. This device has a manual feed door that can be opened and closed above the paper feed cassette. When the manual feed door is opened, this manual feed door will become a manual feed tray as it is, and the manual paper feed rollers will be used for manual feed. If you close the manual feed door, you can perform normal cassette paper feeding.

[0003]

However, in the above-described conventional paper transport mechanism of the image forming apparatus, even when the paper feed / transport from the paper feed cassette is being performed,
Since it is possible to enter the transfer paper from the manual feed section,
The user may mistakenly insert the transfer paper from the manual feed portion while the paper is being fed / conveyed from the paper feed cassette. In this case,
There is a problem in that the transfer paper from the paper feed cassette and the transfer paper from the manual feed portion are overlapped with each other or are continuously conveyed, so that a target image cannot be obtained. In addition, the conveyance state becomes unstable, jamming is likely to occur, and jam detection malfunction occurs. In view of this, the present invention solves the above-mentioned conventional problems, and makes it impossible to feed paper from the manual paper feed unit while the main body paper feed unit is feeding and carrying the paper. An object is to provide a paper transport mechanism for an image forming apparatus.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention resides in that, in claim 1, a main body sheet feeding section for feeding a sheet from a sheet feeding cassette and a manual sheet feeding by opening. A paper feed mechanism of an image forming apparatus that has a manual feed table having a grip portion, and a feed path of the manual feed table merges with the feed path of the main body paper feed unit,
Locking means for preventing the manual feed table from being opened is provided during the operation of the main body paper feeding section.
The lock means is configured to be locked in a state in which the handle portion of the manual feed table is closed.

[0005]

Therefore, according to the first aspect of the present invention, the opening of the manual feed table is prevented by the locking means during the operation of the main body paper feed section for feeding paper from the paper feed cassette, so that the user cannot open the manual feed table, You cannot feed paper.
Further, according to the second aspect, when the locking means locks the manual feed table, the manual grip table is locked in a closed state. Therefore, the user cannot put force on the manual feed table by putting a hand into the manual grip table when locking. , Forcibly prohibit manual paper feeding.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, a pair of transport rollers 11 and 1 is provided on a transport path through which a sheet fed from a main body sheet feeding unit 10 such as a sheet feeding cassette of a copying machine main body is sent to an image forming unit 13.
2 are arranged. Reference numeral 1 denotes a manual feed table, which is provided on the table support portion 1a so as to be rotatable in the direction of arrow B with respect to the apparatus main body, and a handle 1b is provided at the end opposite to the table support portion 1a. An arm 2 rotatably supported by a support pin 3 on the apparatus main body side is provided near the end of the manual feed table 1. One end 2a of the arm 2 is formed in such a shape as to lock the manual feed table 1, and a coil spring 4 whose one end is fixed to the main body of the apparatus is connected to the base of the end 2a. It is biased in the C direction, and the solenoid 5 is connected to the other end.

In this structure, when the main body sheet feeding section 10 is in operation, as shown in FIG. 1, the transfer sheet (not shown) conveyed from the main body sheet feeding section 10 advances in the direction of the arrow by the conveyance rollers 11 and 12. It is sent to the image forming unit 13. At this time, the manual feed table 1 is at the position shown by the solid line, and as shown in FIG. 2, the solenoid 5 is on and the arm 2 is rotated to the position shown by the broken line (arm 2 '). There is. As a result, the end portion 2a of the arm 2 locks the manual feed table 1, so that the manual feed table 1 cannot be opened for manual feed.

On the other hand, the manual feeding is performed only when the main body feeding unit 10 is not operating. In this case, the solenoid 5 is off as shown in FIG. Is supported at the position indicated by the solid line, and the manual feed table 1 can be opened and closed. Therefore, as shown in FIG. 1, the manual feed table 1 is rotated about 90 degrees and brought to the position indicated by the broken line (the manual feed table 1 '), and the transfer paper 6 is guided by the manual feed table 1 in the direction of arrow D. The transfer paper 6 is sent to the image forming unit 13 by the pair of transfer rollers 12.

Next, another embodiment will be described with reference to FIG. The configuration and operation of this embodiment are substantially the same as those of the above-described embodiment (the same members are designated by the same reference numerals), except that the arm 2 is replaced by a distal end whose shape is 2a. The arm 20 having the larger 20a, the manual feed table 1
The point is that they are arranged closer to the handle 1b. In this configuration, when the solenoid 5 is off, it is at the position shown by the solid line in the figure, and when it is on, it rotates to the position shown by the broken line to not only open the manual feed table 1 but also to close the handle 1b (see FIG. See also b)). As a result, the user cannot insert his / her hand into the handle, and manual feeding is forcibly prohibited.

[0010]

As described above, according to the first aspect of the present invention, since the locking means for preventing the manual feed table from being opened is provided during the operation of the main body sheet feeding portion, the user mistakenly transfers the transfer sheet. There is no need to insert it from the manual feed part,
It is possible to prevent overlapping of transfer sheets caused by the user inserting the transfer sheet by mistake, continuous conveyance, jam, malfunction of jam detection, etc., and it is possible to make an accurate copy as intended. According to the second aspect of the present invention, since the locking means locks the grip portion of the manual feed table in a closed state, the user can easily identify that manual paper feed is prohibited, which is convenient. The effect is to improve.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram showing a sheet conveying mechanism of an image forming apparatus of the present invention.

FIG. 2 is a side view of the manual feed table and the lock mechanism as viewed from the direction A in FIG. 1;

FIG. 3 is a configuration diagram showing a lock mechanism for closing a handle.

[Explanation of symbols]

 1 Manual Feed Table 1b Handle 2, 3, 4, 5 Locking Means 10 Main Unit Paper Feeding Section

Claims (2)

[Claims] 1. A main body sheet feeding section for feeding a sheet from a sheet feeding cassette and a manual sheet feeding by opening the sheet feeding cassette. In a paper transport mechanism of an image forming apparatus including a manual paper feed unit that joins a paper path of a paper unit, lock means is provided to prevent the manual paper feed table from opening during operation of the main body paper feed unit. A paper transport mechanism for an image forming apparatus, which is characterized in that 2. The sheet conveying mechanism for an image forming apparatus according to claim 1, wherein the lock means locks the grip portion of the manual feed table in a closed state.