JP3273518B2 - Paper feeder of image forming 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 paper feeder of an image forming apparatus having a vertical transport section in a transport path for transporting transfer paper from a paper feed section to an image recording section.

[0002]

2. Description of the Related Art In a large-sheet feeding type image forming apparatus in which a so-called front loading type sheet feeding tray is provided at a plurality of stages at the bottom of a main body, an image recording section (photosensitive element transfer section) disposed above. In order to transport the transfer paper, a vertical transport section is provided in the transport path.

[0003] The jam handling in the vertical transport section is performed by opening a cover or a front door of the main body, opening a guide plate at a portion where transfer paper is jammed, and if the transfer paper is pinched between the rollers, the roller is opened. The transfer paper was ejected by turning a knob attached to the shaft end.

[0004]

However, in some devices, the location where the guide plate is opened is different, and decals that clearly indicate how to open the guide plate are located in difficult-to-see positions. In this case, it is difficult and time-consuming to perform the jam processing, and if there is any leftover, the same procedure is performed again, resulting in an inefficient copying operation.

The present invention has been made in view of such a background, and provides a paper feeder of an image forming apparatus capable of efficiently performing a jam process in a vertical transport unit without bothering a user. The purpose is to do.

[0006]

An object of the present invention is to provide a pair of guides which are opposed to each other for guiding the transfer paper in a transport path for transporting the transfer paper from a paper feeding unit to an image recording unit, and at least one of which is openable and closable. Plate, and a plurality of sets on one of the pair of guide plates.
One of the rollers of the conveying roller pair is
The other roller of the plurality of transport roller pairs is
And each roller of the plurality of transport roller pairs is
Transfer paper is transferred between the pair of guide plates
And way becomes vertical transfer unit to said a jam detection sensor arranged in the vertical conveying portion, the guide plate for opening and closing each of the conveying rollers of the guide plate freely opening and closing by the presence or absence of the paper jam detection signal of the jam detecting sensor This is achieved by a first means having an opening and closing mechanism.

Further, the above object is achieved by a second means in which, in the first means, a jam paper discharge tray for accommodating the jam paper is provided below the vertical transport section.

According to a second aspect of the present invention, in the second means, a paper jam detection sensor for detecting transfer paper is provided on the paper jam tray, and the paper jam detection sensor detects the paper jam based on the paper jam detection signal of the paper jam detection sensor. This is achieved by a third means provided with a display means for displaying the effect.

[0009]

In the first means, the pair of guide plates of the vertical transport section are opened together with the transport rollers by the jam detection signal of the jam detection sensor, so that the jam paper can be dropped by its own weight, Jam processing can be performed easily.

In the second means, since the jam paper discharge tray is disposed at the position where the jam paper falls, the jam paper can be collected therein.

In the third means, the presence or absence of the jammed paper in the jammed paper discharge tray is indicated by the contained jammed paper detection signal of the contained jammed paper detection sensor. You can call attention.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an image forming apparatus according to an embodiment.

A document table 2 is provided on the upper surface of the main body 1 of the image forming apparatus.
Are provided at the lower part of the main body 1,
4 are provided. Reference numeral 5 denotes a manual paper feed table for manually feeding paper manually. The paper taken out by each paper feed unit is sent to the registration roller 6. A paper discharge tray 7 is mounted on the left side of the main body 1.

Next, the internal structure of the main body 1 will be described.
A photosensitive drum 8 is provided at a substantially central portion of the main body 1. Around the photosensitive drum 8, a charging charger 9,
Optical system 10, developing device 11, transfer charger 12, separation charger 13, cleaning device 14, and discharge lamp 1
5 and the like are sequentially arranged. Reference numeral 16 denotes a paper feed horizontal transport unit, 1
Reference numeral 7 denotes a vertical transport unit, and reference numeral 18 denotes a jam paper discharge tray disposed below the vertical transport unit 17.

FIG. 2 is a view showing the configuration of the vertical transport section and its surroundings according to the embodiment, and FIG.

The vertical transport section 17 is opposed in the vertical direction, and has a pair of guide plates 19 and 20 for inserting and guiding the transfer paper P therein.
And a plurality of pairs of transport rollers 21, 22, and 23 provided so as to enter and abut on the inside of each of the guide plates 19 and 20 via a notch (not shown). One roller 21a, 22 of each transport roller pair 21, 22, 23
a and 23a are guide plates 20 movable in a direction (left and right in the figure) orthogonal to the transport direction to open and close the transport path.
, And are provided with biasing springs 32, 32, 32, respectively, for pressing against the opposing rollers.

Reference numeral 24 denotes a crank pulley supported by a mounting portion (not shown) on a shaft 24a, and 33 denotes crank pulleys 24 and 2.
Reference numeral 25 denotes a timing belt for transmitting the driving force of the guide plate driving motor 26 to the crank pulley 24. Reference numeral 27 denotes a jam detection sensor including a reflection type photo sensor disposed near the guide plate 19.

The guide plate 20 includes two crank pulleys 2.
The connecting portions 30, 30 are protruded at positions corresponding to 4, 4, 24, and these connecting pieces 30, 30 are connected to the crank pulleys 24, 24 by pins 31, 31, respectively.

In such a configuration, the vertical transport section 17
When the jammed paper P between the guide plates 19 and 20 is detected by the jam detection sensor 27, the guide plate drive motor 2
6 is driven, and the crank pulley 24 driven by the timing belt 25 rotates half a turn from the state of FIG. 2 to the state of FIG. Then, the pin 3 is attached to the crank pulleys 24, 24.
The guide plates 20 connected through the guide plates 1 and 31 are also moved rightward in the drawing, so that the guide plates 19 and 20 are moved.
Open (spread). Then, the guide plates 19 and 2
The jammed paper P sandwiched between 0 is dropped into the jammed paper discharge tray 18 below.

As shown in FIG. 3, a paper jam detection sensor 28 for detecting paper jam is provided on the paper jam tray 18 and is electrically connected to a display unit 29.

Accordingly, as described above, the guide plates 19,
When the jammed paper 20 is released and the jammed paper is dropped and stored in the jammed paper discharge tray 18, the stored jammed paper detection sensor 28 detects the dropped jammed paper and outputs a detection signal to the display unit 29. Is displayed based on this, that the jam paper is left, and alerts the user.

[0023]

According to the first aspect of the present invention, the pair of guide plates of the vertical conveyance unit are opened together with the conveyance rollers by the jam detection signal of the jam detection sensor, so that the jam paper falls down by its own weight. And the jam can be easily processed.

According to the second aspect of the present invention, since the jam paper discharge tray is disposed at the position where the jam paper falls, the jam paper can be collected therein.

According to the third aspect of the present invention, the fact that the jammed paper is present in the jammed paper discharge tray is displayed by the contained jammed paper detection signal of the contained jammed paper detection sensor. This can call attention to paper removal.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a sheet feeding device of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a vertical conveyance unit of a sheet feeding device of an image forming apparatus according to an embodiment of the present invention and a periphery thereof.

FIG. 3 is an explanatory diagram illustrating a state in which a vertical transport unit of a sheet feeding device of the image forming apparatus according to the embodiment of the present invention is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 3, 4 Paper feed tray 8 Photoreceptor drum 12 Transfer charger 17 Vertical conveyance part 18 Jam discharge tray 19, 20 Guide plate 21, 22, 23 Transport roller pair 28 Housing jam paper detection sensor 29 Display part

Claims (3)

(57) [Claims] The method according to claim 1 transfer sheet in the conveyance path for conveying the image recording section from the paper feed unit, faces for guiding the transfer sheet, and a pair of guide plates at least one of the openable said pair of guide plates One of a plurality of transport roller pairs
One of the rollers is attached to the other of the pair of guide plates by the plurality of sets.
The other roller of the conveying roller pair is provided respectively,
Both rollers of the pair of transport rollers are the pair of guide plates.
Make sure that the transfer paper is conveyed in contact with
That the vertical conveying portion, a jam detection sensor arranged in the vertical conveying portion, and a guide plate opening and closing mechanism for opening and closing each of the conveying rollers of the guide plate freely opening and closing by the presence or absence of the paper jam detection signal of the jam detecting sensor A sheet feeding device for an image forming apparatus, comprising: 2. The paper feeding device according to claim 1, further comprising a jam paper discharge tray for storing the jam paper below the vertical transport unit. 3. The paper jam detecting device according to claim 2, further comprising a paper jam detecting sensor for detecting the transfer paper, and displaying the paper jam detecting signal based on the paper jam detection signal of the paper jam detecting sensor. A sheet feeding device for an image forming apparatus, comprising a display unit.