JPH06156805A - Sheet feeder of image forming device - Google Patents

Abstract

PURPOSE:To provide a sheet feeder in an image forming device which can remove jamming in a vertical conveyance part efficiently without using user's labor. CONSTITUTION:This sheet feeder is provided with a pair of guide plates 19, 20 facing each other to guide transfer paper on a conveyance route which conveys transfer paper from a paper feed part to an image recording part, at least one of which can open and close, and a vertical conveyance part 17 which consists of multiple pairs of conveyance rollers 21, 22, 23 which are brought into contact inside the guide plates 19, 20, and fix the roller on the guide plate 20 side which can open and close to the guiding plate 20. This device is also provided with a jamming detection sensor 27 which is disposed at the vertical conveyance part 17, and a guide plate opening/closing mechanism for opening and closing the guide plate 20 which can open and close smoothly together with the conveyance roller according to the existence of a sheet jamming detection signal of the jamming detection sensor 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device of an image forming apparatus having a vertical conveying section in a conveying path for conveying a transfer sheet from a sheet feeding section to an image recording section.

[0002]

2. Description of the Related Art In a mass-feeding type image forming apparatus in which a plurality of so-called front loading type sheet feeding trays are provided at the bottom of a main body, an image recording section (transfer section of photoconductor) arranged above is provided. In order to convey the transfer paper, the vertical conveyance section was provided in the conveyance path.

The jam treatment of the vertical transport unit is performed by opening the cover or front door of the main body, then opening the guide plate at the portion where the transfer paper is clogged, and if the transfer paper is caught between the rollers. I turned the knob attached to the shaft end to eject the transfer paper.

[0004]

However, depending on the device, the guide plate may be opened in different places, or decals that clearly indicate how to open the guide plate may be difficult to see. Then, it is difficult and time-consuming to carry out the jam processing, and if there are leftovers, the same procedure will be performed again, resulting in inefficient copy work.

The present invention has been made in view of such a background, and provides a sheet feeding device of an image forming apparatus capable of efficiently performing a jam treatment of a vertical transport portion without bothering a user. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION The above object is to provide a pair of guides that oppose each other for guiding the transfer sheet and at least one of which is openable / closable in a conveyance path for conveying the transfer sheet from the sheet feeding section to the image recording section. A vertical conveying unit, which includes a plate and a plurality of pairs of conveying rollers that abut on the inside of the guide plate and that have openable and closable guide plate-side rollers fixed to the guide plate; and a jam arranged in the vertical conveying unit. This is achieved by a first means including a detection sensor and a guide plate opening / closing mechanism that opens / closes the guide plate that can be opened / closed together with the conveying roller depending on the presence or absence of a paper jam detection signal from the jam detection sensor.

The above-mentioned object is also achieved by the second means in the first means, in which a jammed paper discharge tray for accommodating jammed paper is provided below the vertical transport unit.

Further, in the second means, in the second means, a jammed paper detection sensor for detecting a transfer paper is provided in the jammed paper discharge tray, and the jammed paper detection signal of the jammed paper detection sensor is used to detect the jammed paper. This is achieved by the third means provided with display means for displaying the effect.

[0009]

In the first means, the pair of guide plates of the vertical transport unit 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 downward by its own weight. Jam can be easily processed.

In the second means, since the jammed paper discharge tray is arranged at the position where the jammed paper falls, the jammed paper can be collected in this.

In the third means, the stored jammed paper detection signal from the stored jammed paper detection sensor is used to display that jammed paper is present in the jammed paper discharge tray. You can call attention.

[0012]

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

FIG. 1 is a block 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.
Is provided, and at the bottom of the main body 1, a paper feed tray 3,
4 are provided. Reference numeral 5 is a manual paper feed tray for manually feeding paper as appropriate. The sheet taken out by each sheet feeding section is sent to the registration roller 6. A paper discharge tray 7 is attached to the left side surface of the main body 1.

Next, the internal structure of the main body 1 will be described.
A photoconductor drum 8 is arranged 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 static elimination lamp 1
5 and the like are sequentially arranged. Reference numeral 16 denotes a sheet feeding lateral transport unit, 1
Reference numeral 7 denotes a vertical transport unit, and 18 denotes a jammed paper discharge tray arranged below the vertical transport unit 17.

FIG. 2 is a configuration diagram of a vertical transport unit and its surroundings according to the embodiment, and FIG. 3 is an explanatory view showing a state in which the vertical transport unit is opened.

The vertical transport unit 17 is opposed to each other 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 conveying rollers 21, 22, 23 provided so as to enter and contact the inside of each guide plate 19, 20 through a notch (not shown). One roller 21a, 22 of each transport roller pair 21, 22, 23
a and 23a are guide plates 20 that are movable in a direction (right and left in the figure) orthogonal to the transport direction to open and close the transport path.
Biasing springs 32, 32, 32, which are supported by and are pressed against the opposing rollers, are provided.

Reference numeral 24 is a crank pulley supported by a shaft 24a at a mounting portion (not shown), and 33 is a crank pulley 24,2.
The belt 25 is wound around four, and 25 is a timing belt for transmitting the driving force of the guide plate drive motor 26 to the crank pulley 24. Further, reference numeral 27 is a jam detection sensor which is a reflection type photo sensor arranged near the guide plate 19.

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

In such a structure, the vertical transport unit 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 half-rotates from the state of FIG. 2 to the state of FIG. Then, the crank pulleys 24, 24 have pins 3
The guide plates 20 connected via 1, 31 are also moved in the right direction in the drawing so that the guide plates 19, 20
Open (expand). And these guide plates 19 and 2
The jammed paper P sandwiched between 0s falls into the jammed paper discharge tray 18 below.

Further, as shown in FIG. 3, the jammed paper discharge tray 18 is provided with a stored jammed paper detection sensor 28 for detecting the stored jammed paper and is electrically connected to a display unit 29.

Therefore, as described above, the guide plate 19,
When the jammed paper is dropped into the jammed paper discharge tray 18 and accommodated in the jammed paper discharge tray 18, the accommodated jammed paper detection sensor 28 detects the jammed jammed paper and outputs a detection signal to the display unit 29. On the basis of this, is displayed that the jam paper remains, and warns the user.

[0023]

According to the first aspect of the present invention, the pair of guide plates of the vertical transport unit are opened together with the transport rollers in response to the jam detection signal of the jam detection sensor. Therefore, the jam paper is dropped downward by its own weight. Therefore, the jam treatment can be easily performed.

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

According to the third aspect of the present invention, the stored jammed paper detection signal of the stored jammed paper detection sensor indicates that jammed paper is present in the jammed paper discharge tray. You can call attention to the paper removal.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a vertical transport unit of a sheet feeding device of an image forming apparatus according to an exemplary embodiment of the present invention and its surroundings.

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

[Explanation of symbols]

 1 Main Body 3, 4 Paper Feed Tray 8 Photosensitive Drum 12 Transfer Charger 17 Vertical Transport Section 18 Jam Paper Discharge Tray 19, 20 Guide Plate 21, 22, 23 Transport Roller Pair 28 Stored Jam Paper Detection Sensor 29 Display Section

Claims (3)

[Claims] 1. A pair of guide plates facing each other for guiding the transfer paper, at least one of which is openable and closable, and an inside of the guide plate, in a conveyance path for conveying the transfer paper from a paper feeding unit to an image recording unit. , A vertical conveyance section composed of a plurality of pairs of conveyance rollers having a guide plate side roller that is openable and closable and fixed to the guide plate, a jam detection sensor arranged in the vertical conveyance section, and this jam detection sensor. 2. A sheet feeding device of an image forming apparatus, comprising: a guide plate opening / closing mechanism that opens / closes the guide plate together with the conveying roller, the guide plate being openable / closable according to the presence or absence of the sheet jam detection signal. 2. The sheet feeding device of the image forming apparatus according to claim 1, further comprising a jammed paper discharge tray for accommodating jammed paper provided below the vertical transport unit. 3. The jammed paper detection sensor for detecting a transfer sheet is provided in the jammed paper discharge tray according to claim 2, and the jammed paper detection signal of the jammed paper detection sensor is displayed to that effect. A sheet feeding device of an image forming apparatus, characterized in that display means is provided.